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Revision 1518 - (show annotations)
Fri Feb 6 16:10:27 2015 UTC (4 years, 10 months ago) by ph10
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File size: 312769 byte(s)
Catch auto-possessification potential loop for bad UTF pattern with 
NO_UTF_CHECK.
1 /*************************************************
2 * Perl-Compatible Regular Expressions *
3 *************************************************/
4
5 /* PCRE is a library of functions to support regular expressions whose syntax
6 and semantics are as close as possible to those of the Perl 5 language.
7
8 Written by Philip Hazel
9 Copyright (c) 1997-2014 University of Cambridge
10
11 -----------------------------------------------------------------------------
12 Redistribution and use in source and binary forms, with or without
13 modification, are permitted provided that the following conditions are met:
14
15 * Redistributions of source code must retain the above copyright notice,
16 this list of conditions and the following disclaimer.
17
18 * Redistributions in binary form must reproduce the above copyright
19 notice, this list of conditions and the following disclaimer in the
20 documentation and/or other materials provided with the distribution.
21
22 * Neither the name of the University of Cambridge nor the names of its
23 contributors may be used to endorse or promote products derived from
24 this software without specific prior written permission.
25
26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 POSSIBILITY OF SUCH DAMAGE.
37 -----------------------------------------------------------------------------
38 */
39
40
41 /* This module contains the external function pcre_compile(), along with
42 supporting internal functions that are not used by other modules. */
43
44
45 #ifdef HAVE_CONFIG_H
46 #include "config.h"
47 #endif
48
49 #define NLBLOCK cd /* Block containing newline information */
50 #define PSSTART start_pattern /* Field containing pattern start */
51 #define PSEND end_pattern /* Field containing pattern end */
52
53 #include "pcre_internal.h"
54
55
56 /* When PCRE_DEBUG is defined, we need the pcre(16|32)_printint() function, which
57 is also used by pcretest. PCRE_DEBUG is not defined when building a production
58 library. We do not need to select pcre16_printint.c specially, because the
59 COMPILE_PCREx macro will already be appropriately set. */
60
61 #ifdef PCRE_DEBUG
62 /* pcre_printint.c should not include any headers */
63 #define PCRE_INCLUDED
64 #include "pcre_printint.c"
65 #undef PCRE_INCLUDED
66 #endif
67
68
69 /* Macro for setting individual bits in class bitmaps. */
70
71 #define SETBIT(a,b) a[(b)/8] |= (1 << ((b)&7))
72
73 /* Maximum length value to check against when making sure that the integer that
74 holds the compiled pattern length does not overflow. We make it a bit less than
75 INT_MAX to allow for adding in group terminating bytes, so that we don't have
76 to check them every time. */
77
78 #define OFLOW_MAX (INT_MAX - 20)
79
80 /* Definitions to allow mutual recursion */
81
82 static int
83 add_list_to_class(pcre_uint8 *, pcre_uchar **, int, compile_data *,
84 const pcre_uint32 *, unsigned int);
85
86 static BOOL
87 compile_regex(int, pcre_uchar **, const pcre_uchar **, int *, BOOL, BOOL, int, int,
88 pcre_uint32 *, pcre_int32 *, pcre_uint32 *, pcre_int32 *, branch_chain *,
89 compile_data *, int *);
90
91
92
93 /*************************************************
94 * Code parameters and static tables *
95 *************************************************/
96
97 /* This value specifies the size of stack workspace that is used during the
98 first pre-compile phase that determines how much memory is required. The regex
99 is partly compiled into this space, but the compiled parts are discarded as
100 soon as they can be, so that hopefully there will never be an overrun. The code
101 does, however, check for an overrun. The largest amount I've seen used is 218,
102 so this number is very generous.
103
104 The same workspace is used during the second, actual compile phase for
105 remembering forward references to groups so that they can be filled in at the
106 end. Each entry in this list occupies LINK_SIZE bytes, so even when LINK_SIZE
107 is 4 there is plenty of room for most patterns. However, the memory can get
108 filled up by repetitions of forward references, for example patterns like
109 /(?1){0,1999}(b)/, and one user did hit the limit. The code has been changed so
110 that the workspace is expanded using malloc() in this situation. The value
111 below is therefore a minimum, and we put a maximum on it for safety. The
112 minimum is now also defined in terms of LINK_SIZE so that the use of malloc()
113 kicks in at the same number of forward references in all cases. */
114
115 #define COMPILE_WORK_SIZE (2048*LINK_SIZE)
116 #define COMPILE_WORK_SIZE_MAX (100*COMPILE_WORK_SIZE)
117
118 /* This value determines the size of the initial vector that is used for
119 remembering named groups during the pre-compile. It is allocated on the stack,
120 but if it is too small, it is expanded using malloc(), in a similar way to the
121 workspace. The value is the number of slots in the list. */
122
123 #define NAMED_GROUP_LIST_SIZE 20
124
125 /* The overrun tests check for a slightly smaller size so that they detect the
126 overrun before it actually does run off the end of the data block. */
127
128 #define WORK_SIZE_SAFETY_MARGIN (100)
129
130 /* Private flags added to firstchar and reqchar. */
131
132 #define REQ_CASELESS (1 << 0) /* Indicates caselessness */
133 #define REQ_VARY (1 << 1) /* Reqchar followed non-literal item */
134 /* Negative values for the firstchar and reqchar flags */
135 #define REQ_UNSET (-2)
136 #define REQ_NONE (-1)
137
138 /* Repeated character flags. */
139
140 #define UTF_LENGTH 0x10000000l /* The char contains its length. */
141
142 /* Table for handling escaped characters in the range '0'-'z'. Positive returns
143 are simple data values; negative values are for special things like \d and so
144 on. Zero means further processing is needed (for things like \x), or the escape
145 is invalid. */
146
147 #ifndef EBCDIC
148
149 /* This is the "normal" table for ASCII systems or for EBCDIC systems running
150 in UTF-8 mode. */
151
152 static const short int escapes[] = {
153 0, 0,
154 0, 0,
155 0, 0,
156 0, 0,
157 0, 0,
158 CHAR_COLON, CHAR_SEMICOLON,
159 CHAR_LESS_THAN_SIGN, CHAR_EQUALS_SIGN,
160 CHAR_GREATER_THAN_SIGN, CHAR_QUESTION_MARK,
161 CHAR_COMMERCIAL_AT, -ESC_A,
162 -ESC_B, -ESC_C,
163 -ESC_D, -ESC_E,
164 0, -ESC_G,
165 -ESC_H, 0,
166 0, -ESC_K,
167 0, 0,
168 -ESC_N, 0,
169 -ESC_P, -ESC_Q,
170 -ESC_R, -ESC_S,
171 0, 0,
172 -ESC_V, -ESC_W,
173 -ESC_X, 0,
174 -ESC_Z, CHAR_LEFT_SQUARE_BRACKET,
175 CHAR_BACKSLASH, CHAR_RIGHT_SQUARE_BRACKET,
176 CHAR_CIRCUMFLEX_ACCENT, CHAR_UNDERSCORE,
177 CHAR_GRAVE_ACCENT, 7,
178 -ESC_b, 0,
179 -ESC_d, ESC_e,
180 ESC_f, 0,
181 -ESC_h, 0,
182 0, -ESC_k,
183 0, 0,
184 ESC_n, 0,
185 -ESC_p, 0,
186 ESC_r, -ESC_s,
187 ESC_tee, 0,
188 -ESC_v, -ESC_w,
189 0, 0,
190 -ESC_z
191 };
192
193 #else
194
195 /* This is the "abnormal" table for EBCDIC systems without UTF-8 support. */
196
197 static const short int escapes[] = {
198 /* 48 */ 0, 0, 0, '.', '<', '(', '+', '|',
199 /* 50 */ '&', 0, 0, 0, 0, 0, 0, 0,
200 /* 58 */ 0, 0, '!', '$', '*', ')', ';', '~',
201 /* 60 */ '-', '/', 0, 0, 0, 0, 0, 0,
202 /* 68 */ 0, 0, '|', ',', '%', '_', '>', '?',
203 /* 70 */ 0, 0, 0, 0, 0, 0, 0, 0,
204 /* 78 */ 0, '`', ':', '#', '@', '\'', '=', '"',
205 /* 80 */ 0, 7, -ESC_b, 0, -ESC_d, ESC_e, ESC_f, 0,
206 /* 88 */-ESC_h, 0, 0, '{', 0, 0, 0, 0,
207 /* 90 */ 0, 0, -ESC_k, 'l', 0, ESC_n, 0, -ESC_p,
208 /* 98 */ 0, ESC_r, 0, '}', 0, 0, 0, 0,
209 /* A0 */ 0, '~', -ESC_s, ESC_tee, 0,-ESC_v, -ESC_w, 0,
210 /* A8 */ 0,-ESC_z, 0, 0, 0, '[', 0, 0,
211 /* B0 */ 0, 0, 0, 0, 0, 0, 0, 0,
212 /* B8 */ 0, 0, 0, 0, 0, ']', '=', '-',
213 /* C0 */ '{',-ESC_A, -ESC_B, -ESC_C, -ESC_D,-ESC_E, 0, -ESC_G,
214 /* C8 */-ESC_H, 0, 0, 0, 0, 0, 0, 0,
215 /* D0 */ '}', 0, -ESC_K, 0, 0,-ESC_N, 0, -ESC_P,
216 /* D8 */-ESC_Q,-ESC_R, 0, 0, 0, 0, 0, 0,
217 /* E0 */ '\\', 0, -ESC_S, 0, 0,-ESC_V, -ESC_W, -ESC_X,
218 /* E8 */ 0,-ESC_Z, 0, 0, 0, 0, 0, 0,
219 /* F0 */ 0, 0, 0, 0, 0, 0, 0, 0,
220 /* F8 */ 0, 0, 0, 0, 0, 0, 0, 0
221 };
222 #endif
223
224
225 /* Table of special "verbs" like (*PRUNE). This is a short table, so it is
226 searched linearly. Put all the names into a single string, in order to reduce
227 the number of relocations when a shared library is dynamically linked. The
228 string is built from string macros so that it works in UTF-8 mode on EBCDIC
229 platforms. */
230
231 typedef struct verbitem {
232 int len; /* Length of verb name */
233 int op; /* Op when no arg, or -1 if arg mandatory */
234 int op_arg; /* Op when arg present, or -1 if not allowed */
235 } verbitem;
236
237 static const char verbnames[] =
238 "\0" /* Empty name is a shorthand for MARK */
239 STRING_MARK0
240 STRING_ACCEPT0
241 STRING_COMMIT0
242 STRING_F0
243 STRING_FAIL0
244 STRING_PRUNE0
245 STRING_SKIP0
246 STRING_THEN;
247
248 static const verbitem verbs[] = {
249 { 0, -1, OP_MARK },
250 { 4, -1, OP_MARK },
251 { 6, OP_ACCEPT, -1 },
252 { 6, OP_COMMIT, -1 },
253 { 1, OP_FAIL, -1 },
254 { 4, OP_FAIL, -1 },
255 { 5, OP_PRUNE, OP_PRUNE_ARG },
256 { 4, OP_SKIP, OP_SKIP_ARG },
257 { 4, OP_THEN, OP_THEN_ARG }
258 };
259
260 static const int verbcount = sizeof(verbs)/sizeof(verbitem);
261
262
263 /* Substitutes for [[:<:]] and [[:>:]], which mean start and end of word in
264 another regex library. */
265
266 static const pcre_uchar sub_start_of_word[] = {
267 CHAR_BACKSLASH, CHAR_b, CHAR_LEFT_PARENTHESIS, CHAR_QUESTION_MARK,
268 CHAR_EQUALS_SIGN, CHAR_BACKSLASH, CHAR_w, CHAR_RIGHT_PARENTHESIS, '\0' };
269
270 static const pcre_uchar sub_end_of_word[] = {
271 CHAR_BACKSLASH, CHAR_b, CHAR_LEFT_PARENTHESIS, CHAR_QUESTION_MARK,
272 CHAR_LESS_THAN_SIGN, CHAR_EQUALS_SIGN, CHAR_BACKSLASH, CHAR_w,
273 CHAR_RIGHT_PARENTHESIS, '\0' };
274
275
276 /* Tables of names of POSIX character classes and their lengths. The names are
277 now all in a single string, to reduce the number of relocations when a shared
278 library is dynamically loaded. The list of lengths is terminated by a zero
279 length entry. The first three must be alpha, lower, upper, as this is assumed
280 for handling case independence. The indices for graph, print, and punct are
281 needed, so identify them. */
282
283 static const char posix_names[] =
284 STRING_alpha0 STRING_lower0 STRING_upper0 STRING_alnum0
285 STRING_ascii0 STRING_blank0 STRING_cntrl0 STRING_digit0
286 STRING_graph0 STRING_print0 STRING_punct0 STRING_space0
287 STRING_word0 STRING_xdigit;
288
289 static const pcre_uint8 posix_name_lengths[] = {
290 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 6, 0 };
291
292 #define PC_GRAPH 8
293 #define PC_PRINT 9
294 #define PC_PUNCT 10
295
296
297 /* Table of class bit maps for each POSIX class. Each class is formed from a
298 base map, with an optional addition or removal of another map. Then, for some
299 classes, there is some additional tweaking: for [:blank:] the vertical space
300 characters are removed, and for [:alpha:] and [:alnum:] the underscore
301 character is removed. The triples in the table consist of the base map offset,
302 second map offset or -1 if no second map, and a non-negative value for map
303 addition or a negative value for map subtraction (if there are two maps). The
304 absolute value of the third field has these meanings: 0 => no tweaking, 1 =>
305 remove vertical space characters, 2 => remove underscore. */
306
307 static const int posix_class_maps[] = {
308 cbit_word, cbit_digit, -2, /* alpha */
309 cbit_lower, -1, 0, /* lower */
310 cbit_upper, -1, 0, /* upper */
311 cbit_word, -1, 2, /* alnum - word without underscore */
312 cbit_print, cbit_cntrl, 0, /* ascii */
313 cbit_space, -1, 1, /* blank - a GNU extension */
314 cbit_cntrl, -1, 0, /* cntrl */
315 cbit_digit, -1, 0, /* digit */
316 cbit_graph, -1, 0, /* graph */
317 cbit_print, -1, 0, /* print */
318 cbit_punct, -1, 0, /* punct */
319 cbit_space, -1, 0, /* space */
320 cbit_word, -1, 0, /* word - a Perl extension */
321 cbit_xdigit,-1, 0 /* xdigit */
322 };
323
324 /* Table of substitutes for \d etc when PCRE_UCP is set. They are replaced by
325 Unicode property escapes. */
326
327 #ifdef SUPPORT_UCP
328 static const pcre_uchar string_PNd[] = {
329 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
330 CHAR_N, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
331 static const pcre_uchar string_pNd[] = {
332 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
333 CHAR_N, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
334 static const pcre_uchar string_PXsp[] = {
335 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
336 CHAR_X, CHAR_s, CHAR_p, CHAR_RIGHT_CURLY_BRACKET, '\0' };
337 static const pcre_uchar string_pXsp[] = {
338 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
339 CHAR_X, CHAR_s, CHAR_p, CHAR_RIGHT_CURLY_BRACKET, '\0' };
340 static const pcre_uchar string_PXwd[] = {
341 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
342 CHAR_X, CHAR_w, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
343 static const pcre_uchar string_pXwd[] = {
344 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
345 CHAR_X, CHAR_w, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
346
347 static const pcre_uchar *substitutes[] = {
348 string_PNd, /* \D */
349 string_pNd, /* \d */
350 string_PXsp, /* \S */ /* Xsp is Perl space, but from 8.34, Perl */
351 string_pXsp, /* \s */ /* space and POSIX space are the same. */
352 string_PXwd, /* \W */
353 string_pXwd /* \w */
354 };
355
356 /* The POSIX class substitutes must be in the order of the POSIX class names,
357 defined above, and there are both positive and negative cases. NULL means no
358 general substitute of a Unicode property escape (\p or \P). However, for some
359 POSIX classes (e.g. graph, print, punct) a special property code is compiled
360 directly. */
361
362 static const pcre_uchar string_pL[] = {
363 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
364 CHAR_L, CHAR_RIGHT_CURLY_BRACKET, '\0' };
365 static const pcre_uchar string_pLl[] = {
366 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
367 CHAR_L, CHAR_l, CHAR_RIGHT_CURLY_BRACKET, '\0' };
368 static const pcre_uchar string_pLu[] = {
369 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
370 CHAR_L, CHAR_u, CHAR_RIGHT_CURLY_BRACKET, '\0' };
371 static const pcre_uchar string_pXan[] = {
372 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
373 CHAR_X, CHAR_a, CHAR_n, CHAR_RIGHT_CURLY_BRACKET, '\0' };
374 static const pcre_uchar string_h[] = {
375 CHAR_BACKSLASH, CHAR_h, '\0' };
376 static const pcre_uchar string_pXps[] = {
377 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
378 CHAR_X, CHAR_p, CHAR_s, CHAR_RIGHT_CURLY_BRACKET, '\0' };
379 static const pcre_uchar string_PL[] = {
380 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
381 CHAR_L, CHAR_RIGHT_CURLY_BRACKET, '\0' };
382 static const pcre_uchar string_PLl[] = {
383 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
384 CHAR_L, CHAR_l, CHAR_RIGHT_CURLY_BRACKET, '\0' };
385 static const pcre_uchar string_PLu[] = {
386 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
387 CHAR_L, CHAR_u, CHAR_RIGHT_CURLY_BRACKET, '\0' };
388 static const pcre_uchar string_PXan[] = {
389 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
390 CHAR_X, CHAR_a, CHAR_n, CHAR_RIGHT_CURLY_BRACKET, '\0' };
391 static const pcre_uchar string_H[] = {
392 CHAR_BACKSLASH, CHAR_H, '\0' };
393 static const pcre_uchar string_PXps[] = {
394 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
395 CHAR_X, CHAR_p, CHAR_s, CHAR_RIGHT_CURLY_BRACKET, '\0' };
396
397 static const pcre_uchar *posix_substitutes[] = {
398 string_pL, /* alpha */
399 string_pLl, /* lower */
400 string_pLu, /* upper */
401 string_pXan, /* alnum */
402 NULL, /* ascii */
403 string_h, /* blank */
404 NULL, /* cntrl */
405 string_pNd, /* digit */
406 NULL, /* graph */
407 NULL, /* print */
408 NULL, /* punct */
409 string_pXps, /* space */ /* Xps is POSIX space, but from 8.34 */
410 string_pXwd, /* word */ /* Perl and POSIX space are the same */
411 NULL, /* xdigit */
412 /* Negated cases */
413 string_PL, /* ^alpha */
414 string_PLl, /* ^lower */
415 string_PLu, /* ^upper */
416 string_PXan, /* ^alnum */
417 NULL, /* ^ascii */
418 string_H, /* ^blank */
419 NULL, /* ^cntrl */
420 string_PNd, /* ^digit */
421 NULL, /* ^graph */
422 NULL, /* ^print */
423 NULL, /* ^punct */
424 string_PXps, /* ^space */ /* Xps is POSIX space, but from 8.34 */
425 string_PXwd, /* ^word */ /* Perl and POSIX space are the same */
426 NULL /* ^xdigit */
427 };
428 #define POSIX_SUBSIZE (sizeof(posix_substitutes) / sizeof(pcre_uchar *))
429 #endif
430
431 #define STRING(a) # a
432 #define XSTRING(s) STRING(s)
433
434 /* The texts of compile-time error messages. These are "char *" because they
435 are passed to the outside world. Do not ever re-use any error number, because
436 they are documented. Always add a new error instead. Messages marked DEAD below
437 are no longer used. This used to be a table of strings, but in order to reduce
438 the number of relocations needed when a shared library is loaded dynamically,
439 it is now one long string. We cannot use a table of offsets, because the
440 lengths of inserts such as XSTRING(MAX_NAME_SIZE) are not known. Instead, we
441 simply count through to the one we want - this isn't a performance issue
442 because these strings are used only when there is a compilation error.
443
444 Each substring ends with \0 to insert a null character. This includes the final
445 substring, so that the whole string ends with \0\0, which can be detected when
446 counting through. */
447
448 static const char error_texts[] =
449 "no error\0"
450 "\\ at end of pattern\0"
451 "\\c at end of pattern\0"
452 "unrecognized character follows \\\0"
453 "numbers out of order in {} quantifier\0"
454 /* 5 */
455 "number too big in {} quantifier\0"
456 "missing terminating ] for character class\0"
457 "invalid escape sequence in character class\0"
458 "range out of order in character class\0"
459 "nothing to repeat\0"
460 /* 10 */
461 "operand of unlimited repeat could match the empty string\0" /** DEAD **/
462 "internal error: unexpected repeat\0"
463 "unrecognized character after (? or (?-\0"
464 "POSIX named classes are supported only within a class\0"
465 "missing )\0"
466 /* 15 */
467 "reference to non-existent subpattern\0"
468 "erroffset passed as NULL\0"
469 "unknown option bit(s) set\0"
470 "missing ) after comment\0"
471 "parentheses nested too deeply\0" /** DEAD **/
472 /* 20 */
473 "regular expression is too large\0"
474 "failed to get memory\0"
475 "unmatched parentheses\0"
476 "internal error: code overflow\0"
477 "unrecognized character after (?<\0"
478 /* 25 */
479 "lookbehind assertion is not fixed length\0"
480 "malformed number or name after (?(\0"
481 "conditional group contains more than two branches\0"
482 "assertion expected after (?(\0"
483 "(?R or (?[+-]digits must be followed by )\0"
484 /* 30 */
485 "unknown POSIX class name\0"
486 "POSIX collating elements are not supported\0"
487 "this version of PCRE is compiled without UTF support\0"
488 "spare error\0" /** DEAD **/
489 "character value in \\x{} or \\o{} is too large\0"
490 /* 35 */
491 "invalid condition (?(0)\0"
492 "\\C not allowed in lookbehind assertion\0"
493 "PCRE does not support \\L, \\l, \\N{name}, \\U, or \\u\0"
494 "number after (?C is > 255\0"
495 "closing ) for (?C expected\0"
496 /* 40 */
497 "recursive call could loop indefinitely\0"
498 "unrecognized character after (?P\0"
499 "syntax error in subpattern name (missing terminator)\0"
500 "two named subpatterns have the same name\0"
501 "invalid UTF-8 string\0"
502 /* 45 */
503 "support for \\P, \\p, and \\X has not been compiled\0"
504 "malformed \\P or \\p sequence\0"
505 "unknown property name after \\P or \\p\0"
506 "subpattern name is too long (maximum " XSTRING(MAX_NAME_SIZE) " characters)\0"
507 "too many named subpatterns (maximum " XSTRING(MAX_NAME_COUNT) ")\0"
508 /* 50 */
509 "repeated subpattern is too long\0" /** DEAD **/
510 "octal value is greater than \\377 in 8-bit non-UTF-8 mode\0"
511 "internal error: overran compiling workspace\0"
512 "internal error: previously-checked referenced subpattern not found\0"
513 "DEFINE group contains more than one branch\0"
514 /* 55 */
515 "repeating a DEFINE group is not allowed\0" /** DEAD **/
516 "inconsistent NEWLINE options\0"
517 "\\g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number\0"
518 "a numbered reference must not be zero\0"
519 "an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT)\0"
520 /* 60 */
521 "(*VERB) not recognized or malformed\0"
522 "number is too big\0"
523 "subpattern name expected\0"
524 "digit expected after (?+\0"
525 "] is an invalid data character in JavaScript compatibility mode\0"
526 /* 65 */
527 "different names for subpatterns of the same number are not allowed\0"
528 "(*MARK) must have an argument\0"
529 "this version of PCRE is not compiled with Unicode property support\0"
530 "\\c must be followed by an ASCII character\0"
531 "\\k is not followed by a braced, angle-bracketed, or quoted name\0"
532 /* 70 */
533 "internal error: unknown opcode in find_fixedlength()\0"
534 "\\N is not supported in a class\0"
535 "too many forward references\0"
536 "disallowed Unicode code point (>= 0xd800 && <= 0xdfff)\0"
537 "invalid UTF-16 string\0"
538 /* 75 */
539 "name is too long in (*MARK), (*PRUNE), (*SKIP), or (*THEN)\0"
540 "character value in \\u.... sequence is too large\0"
541 "invalid UTF-32 string\0"
542 "setting UTF is disabled by the application\0"
543 "non-hex character in \\x{} (closing brace missing?)\0"
544 /* 80 */
545 "non-octal character in \\o{} (closing brace missing?)\0"
546 "missing opening brace after \\o\0"
547 "parentheses are too deeply nested\0"
548 "invalid range in character class\0"
549 "group name must start with a non-digit\0"
550 /* 85 */
551 "parentheses are too deeply nested (stack check)\0"
552 "digits missing in \\x{} or \\o{}\0"
553 ;
554
555 /* Table to identify digits and hex digits. This is used when compiling
556 patterns. Note that the tables in chartables are dependent on the locale, and
557 may mark arbitrary characters as digits - but the PCRE compiling code expects
558 to handle only 0-9, a-z, and A-Z as digits when compiling. That is why we have
559 a private table here. It costs 256 bytes, but it is a lot faster than doing
560 character value tests (at least in some simple cases I timed), and in some
561 applications one wants PCRE to compile efficiently as well as match
562 efficiently.
563
564 For convenience, we use the same bit definitions as in chartables:
565
566 0x04 decimal digit
567 0x08 hexadecimal digit
568
569 Then we can use ctype_digit and ctype_xdigit in the code. */
570
571 /* Using a simple comparison for decimal numbers rather than a memory read
572 is much faster, and the resulting code is simpler (the compiler turns it
573 into a subtraction and unsigned comparison). */
574
575 #define IS_DIGIT(x) ((x) >= CHAR_0 && (x) <= CHAR_9)
576
577 #ifndef EBCDIC
578
579 /* This is the "normal" case, for ASCII systems, and EBCDIC systems running in
580 UTF-8 mode. */
581
582 static const pcre_uint8 digitab[] =
583 {
584 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 0- 7 */
585 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 8- 15 */
586 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 16- 23 */
587 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24- 31 */
588 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - ' */
589 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* ( - / */
590 0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c, /* 0 - 7 */
591 0x0c,0x0c,0x00,0x00,0x00,0x00,0x00,0x00, /* 8 - ? */
592 0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* @ - G */
593 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* H - O */
594 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* P - W */
595 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* X - _ */
596 0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* ` - g */
597 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* h - o */
598 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* p - w */
599 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* x -127 */
600 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 128-135 */
601 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 136-143 */
602 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 144-151 */
603 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 152-159 */
604 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 160-167 */
605 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 168-175 */
606 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 176-183 */
607 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 184-191 */
608 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 192-199 */
609 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 200-207 */
610 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 208-215 */
611 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 216-223 */
612 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 224-231 */
613 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 232-239 */
614 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 240-247 */
615 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};/* 248-255 */
616
617 #else
618
619 /* This is the "abnormal" case, for EBCDIC systems not running in UTF-8 mode. */
620
621 static const pcre_uint8 digitab[] =
622 {
623 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 0- 7 0 */
624 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 8- 15 */
625 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 16- 23 10 */
626 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24- 31 */
627 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 32- 39 20 */
628 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 40- 47 */
629 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 48- 55 30 */
630 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 56- 63 */
631 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - 71 40 */
632 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 72- | */
633 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* & - 87 50 */
634 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 88- 95 */
635 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - -103 60 */
636 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 104- ? */
637 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112-119 70 */
638 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 120- " */
639 0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* 128- g 80 */
640 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* h -143 */
641 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 144- p 90 */
642 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* q -159 */
643 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 160- x A0 */
644 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* y -175 */
645 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* ^ -183 B0 */
646 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 184-191 */
647 0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* { - G C0 */
648 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* H -207 */
649 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* } - P D0 */
650 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Q -223 */
651 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* \ - X E0 */
652 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Y -239 */
653 0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c, /* 0 - 7 F0 */
654 0x0c,0x0c,0x00,0x00,0x00,0x00,0x00,0x00};/* 8 -255 */
655
656 static const pcre_uint8 ebcdic_chartab[] = { /* chartable partial dup */
657 0x80,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /* 0- 7 */
658 0x00,0x00,0x00,0x00,0x01,0x01,0x00,0x00, /* 8- 15 */
659 0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /* 16- 23 */
660 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24- 31 */
661 0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /* 32- 39 */
662 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 40- 47 */
663 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 48- 55 */
664 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 56- 63 */
665 0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - 71 */
666 0x00,0x00,0x00,0x80,0x00,0x80,0x80,0x80, /* 72- | */
667 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* & - 87 */
668 0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00, /* 88- 95 */
669 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - -103 */
670 0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x80, /* 104- ? */
671 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112-119 */
672 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 120- " */
673 0x00,0x1a,0x1a,0x1a,0x1a,0x1a,0x1a,0x12, /* 128- g */
674 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* h -143 */
675 0x00,0x12,0x12,0x12,0x12,0x12,0x12,0x12, /* 144- p */
676 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* q -159 */
677 0x00,0x00,0x12,0x12,0x12,0x12,0x12,0x12, /* 160- x */
678 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* y -175 */
679 0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* ^ -183 */
680 0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00, /* 184-191 */
681 0x80,0x1a,0x1a,0x1a,0x1a,0x1a,0x1a,0x12, /* { - G */
682 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* H -207 */
683 0x00,0x12,0x12,0x12,0x12,0x12,0x12,0x12, /* } - P */
684 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* Q -223 */
685 0x00,0x00,0x12,0x12,0x12,0x12,0x12,0x12, /* \ - X */
686 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* Y -239 */
687 0x1c,0x1c,0x1c,0x1c,0x1c,0x1c,0x1c,0x1c, /* 0 - 7 */
688 0x1c,0x1c,0x00,0x00,0x00,0x00,0x00,0x00};/* 8 -255 */
689 #endif
690
691
692 /* This table is used to check whether auto-possessification is possible
693 between adjacent character-type opcodes. The left-hand (repeated) opcode is
694 used to select the row, and the right-hand opcode is use to select the column.
695 A value of 1 means that auto-possessification is OK. For example, the second
696 value in the first row means that \D+\d can be turned into \D++\d.
697
698 The Unicode property types (\P and \p) have to be present to fill out the table
699 because of what their opcode values are, but the table values should always be
700 zero because property types are handled separately in the code. The last four
701 columns apply to items that cannot be repeated, so there is no need to have
702 rows for them. Note that OP_DIGIT etc. are generated only when PCRE_UCP is
703 *not* set. When it is set, \d etc. are converted into OP_(NOT_)PROP codes. */
704
705 #define APTROWS (LAST_AUTOTAB_LEFT_OP - FIRST_AUTOTAB_OP + 1)
706 #define APTCOLS (LAST_AUTOTAB_RIGHT_OP - FIRST_AUTOTAB_OP + 1)
707
708 static const pcre_uint8 autoposstab[APTROWS][APTCOLS] = {
709 /* \D \d \S \s \W \w . .+ \C \P \p \R \H \h \V \v \X \Z \z $ $M */
710 { 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, /* \D */
711 { 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1 }, /* \d */
712 { 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1 }, /* \S */
713 { 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, /* \s */
714 { 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, /* \W */
715 { 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1 }, /* \w */
716 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, /* . */
717 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, /* .+ */
718 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, /* \C */
719 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, /* \P */
720 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, /* \p */
721 { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0 }, /* \R */
722 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0 }, /* \H */
723 { 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0 }, /* \h */
724 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0 }, /* \V */
725 { 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0 }, /* \v */
726 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 } /* \X */
727 };
728
729
730 /* This table is used to check whether auto-possessification is possible
731 between adjacent Unicode property opcodes (OP_PROP and OP_NOTPROP). The
732 left-hand (repeated) opcode is used to select the row, and the right-hand
733 opcode is used to select the column. The values are as follows:
734
735 0 Always return FALSE (never auto-possessify)
736 1 Character groups are distinct (possessify if both are OP_PROP)
737 2 Check character categories in the same group (general or particular)
738 3 TRUE if the two opcodes are not the same (PROP vs NOTPROP)
739
740 4 Check left general category vs right particular category
741 5 Check right general category vs left particular category
742
743 6 Left alphanum vs right general category
744 7 Left space vs right general category
745 8 Left word vs right general category
746
747 9 Right alphanum vs left general category
748 10 Right space vs left general category
749 11 Right word vs left general category
750
751 12 Left alphanum vs right particular category
752 13 Left space vs right particular category
753 14 Left word vs right particular category
754
755 15 Right alphanum vs left particular category
756 16 Right space vs left particular category
757 17 Right word vs left particular category
758 */
759
760 static const pcre_uint8 propposstab[PT_TABSIZE][PT_TABSIZE] = {
761 /* ANY LAMP GC PC SC ALNUM SPACE PXSPACE WORD CLIST UCNC */
762 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, /* PT_ANY */
763 { 0, 3, 0, 0, 0, 3, 1, 1, 0, 0, 0 }, /* PT_LAMP */
764 { 0, 0, 2, 4, 0, 9, 10, 10, 11, 0, 0 }, /* PT_GC */
765 { 0, 0, 5, 2, 0, 15, 16, 16, 17, 0, 0 }, /* PT_PC */
766 { 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0 }, /* PT_SC */
767 { 0, 3, 6, 12, 0, 3, 1, 1, 0, 0, 0 }, /* PT_ALNUM */
768 { 0, 1, 7, 13, 0, 1, 3, 3, 1, 0, 0 }, /* PT_SPACE */
769 { 0, 1, 7, 13, 0, 1, 3, 3, 1, 0, 0 }, /* PT_PXSPACE */
770 { 0, 0, 8, 14, 0, 0, 1, 1, 3, 0, 0 }, /* PT_WORD */
771 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, /* PT_CLIST */
772 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3 } /* PT_UCNC */
773 };
774
775 /* This table is used to check whether auto-possessification is possible
776 between adjacent Unicode property opcodes (OP_PROP and OP_NOTPROP) when one
777 specifies a general category and the other specifies a particular category. The
778 row is selected by the general category and the column by the particular
779 category. The value is 1 if the particular category is not part of the general
780 category. */
781
782 static const pcre_uint8 catposstab[7][30] = {
783 /* Cc Cf Cn Co Cs Ll Lm Lo Lt Lu Mc Me Mn Nd Nl No Pc Pd Pe Pf Pi Po Ps Sc Sk Sm So Zl Zp Zs */
784 { 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, /* C */
785 { 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, /* L */
786 { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, /* M */
787 { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, /* N */
788 { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1 }, /* P */
789 { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1 }, /* S */
790 { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0 } /* Z */
791 };
792
793 /* This table is used when checking ALNUM, (PX)SPACE, SPACE, and WORD against
794 a general or particular category. The properties in each row are those
795 that apply to the character set in question. Duplication means that a little
796 unnecessary work is done when checking, but this keeps things much simpler
797 because they can all use the same code. For more details see the comment where
798 this table is used.
799
800 Note: SPACE and PXSPACE used to be different because Perl excluded VT from
801 "space", but from Perl 5.18 it's included, so both categories are treated the
802 same here. */
803
804 static const pcre_uint8 posspropstab[3][4] = {
805 { ucp_L, ucp_N, ucp_N, ucp_Nl }, /* ALNUM, 3rd and 4th values redundant */
806 { ucp_Z, ucp_Z, ucp_C, ucp_Cc }, /* SPACE and PXSPACE, 2nd value redundant */
807 { ucp_L, ucp_N, ucp_P, ucp_Po } /* WORD */
808 };
809
810 /* This table is used when converting repeating opcodes into possessified
811 versions as a result of an explicit possessive quantifier such as ++. A zero
812 value means there is no possessified version - in those cases the item in
813 question must be wrapped in ONCE brackets. The table is truncated at OP_CALLOUT
814 because all relevant opcodes are less than that. */
815
816 static const pcre_uint8 opcode_possessify[] = {
817 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0 - 15 */
818 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 16 - 31 */
819
820 0, /* NOTI */
821 OP_POSSTAR, 0, /* STAR, MINSTAR */
822 OP_POSPLUS, 0, /* PLUS, MINPLUS */
823 OP_POSQUERY, 0, /* QUERY, MINQUERY */
824 OP_POSUPTO, 0, /* UPTO, MINUPTO */
825 0, /* EXACT */
826 0, 0, 0, 0, /* POS{STAR,PLUS,QUERY,UPTO} */
827
828 OP_POSSTARI, 0, /* STARI, MINSTARI */
829 OP_POSPLUSI, 0, /* PLUSI, MINPLUSI */
830 OP_POSQUERYI, 0, /* QUERYI, MINQUERYI */
831 OP_POSUPTOI, 0, /* UPTOI, MINUPTOI */
832 0, /* EXACTI */
833 0, 0, 0, 0, /* POS{STARI,PLUSI,QUERYI,UPTOI} */
834
835 OP_NOTPOSSTAR, 0, /* NOTSTAR, NOTMINSTAR */
836 OP_NOTPOSPLUS, 0, /* NOTPLUS, NOTMINPLUS */
837 OP_NOTPOSQUERY, 0, /* NOTQUERY, NOTMINQUERY */
838 OP_NOTPOSUPTO, 0, /* NOTUPTO, NOTMINUPTO */
839 0, /* NOTEXACT */
840 0, 0, 0, 0, /* NOTPOS{STAR,PLUS,QUERY,UPTO} */
841
842 OP_NOTPOSSTARI, 0, /* NOTSTARI, NOTMINSTARI */
843 OP_NOTPOSPLUSI, 0, /* NOTPLUSI, NOTMINPLUSI */
844 OP_NOTPOSQUERYI, 0, /* NOTQUERYI, NOTMINQUERYI */
845 OP_NOTPOSUPTOI, 0, /* NOTUPTOI, NOTMINUPTOI */
846 0, /* NOTEXACTI */
847 0, 0, 0, 0, /* NOTPOS{STARI,PLUSI,QUERYI,UPTOI} */
848
849 OP_TYPEPOSSTAR, 0, /* TYPESTAR, TYPEMINSTAR */
850 OP_TYPEPOSPLUS, 0, /* TYPEPLUS, TYPEMINPLUS */
851 OP_TYPEPOSQUERY, 0, /* TYPEQUERY, TYPEMINQUERY */
852 OP_TYPEPOSUPTO, 0, /* TYPEUPTO, TYPEMINUPTO */
853 0, /* TYPEEXACT */
854 0, 0, 0, 0, /* TYPEPOS{STAR,PLUS,QUERY,UPTO} */
855
856 OP_CRPOSSTAR, 0, /* CRSTAR, CRMINSTAR */
857 OP_CRPOSPLUS, 0, /* CRPLUS, CRMINPLUS */
858 OP_CRPOSQUERY, 0, /* CRQUERY, CRMINQUERY */
859 OP_CRPOSRANGE, 0, /* CRRANGE, CRMINRANGE */
860 0, 0, 0, 0, /* CRPOS{STAR,PLUS,QUERY,RANGE} */
861
862 0, 0, 0, /* CLASS, NCLASS, XCLASS */
863 0, 0, /* REF, REFI */
864 0, 0, /* DNREF, DNREFI */
865 0, 0 /* RECURSE, CALLOUT */
866 };
867
868
869
870 /*************************************************
871 * Find an error text *
872 *************************************************/
873
874 /* The error texts are now all in one long string, to save on relocations. As
875 some of the text is of unknown length, we can't use a table of offsets.
876 Instead, just count through the strings. This is not a performance issue
877 because it happens only when there has been a compilation error.
878
879 Argument: the error number
880 Returns: pointer to the error string
881 */
882
883 static const char *
884 find_error_text(int n)
885 {
886 const char *s = error_texts;
887 for (; n > 0; n--)
888 {
889 while (*s++ != CHAR_NULL) {};
890 if (*s == CHAR_NULL) return "Error text not found (please report)";
891 }
892 return s;
893 }
894
895
896
897 /*************************************************
898 * Expand the workspace *
899 *************************************************/
900
901 /* This function is called during the second compiling phase, if the number of
902 forward references fills the existing workspace, which is originally a block on
903 the stack. A larger block is obtained from malloc() unless the ultimate limit
904 has been reached or the increase will be rather small.
905
906 Argument: pointer to the compile data block
907 Returns: 0 if all went well, else an error number
908 */
909
910 static int
911 expand_workspace(compile_data *cd)
912 {
913 pcre_uchar *newspace;
914 int newsize = cd->workspace_size * 2;
915
916 if (newsize > COMPILE_WORK_SIZE_MAX) newsize = COMPILE_WORK_SIZE_MAX;
917 if (cd->workspace_size >= COMPILE_WORK_SIZE_MAX ||
918 newsize - cd->workspace_size < WORK_SIZE_SAFETY_MARGIN)
919 return ERR72;
920
921 newspace = (PUBL(malloc))(IN_UCHARS(newsize));
922 if (newspace == NULL) return ERR21;
923 memcpy(newspace, cd->start_workspace, cd->workspace_size * sizeof(pcre_uchar));
924 cd->hwm = (pcre_uchar *)newspace + (cd->hwm - cd->start_workspace);
925 if (cd->workspace_size > COMPILE_WORK_SIZE)
926 (PUBL(free))((void *)cd->start_workspace);
927 cd->start_workspace = newspace;
928 cd->workspace_size = newsize;
929 return 0;
930 }
931
932
933
934 /*************************************************
935 * Check for counted repeat *
936 *************************************************/
937
938 /* This function is called when a '{' is encountered in a place where it might
939 start a quantifier. It looks ahead to see if it really is a quantifier or not.
940 It is only a quantifier if it is one of the forms {ddd} {ddd,} or {ddd,ddd}
941 where the ddds are digits.
942
943 Arguments:
944 p pointer to the first char after '{'
945
946 Returns: TRUE or FALSE
947 */
948
949 static BOOL
950 is_counted_repeat(const pcre_uchar *p)
951 {
952 if (!IS_DIGIT(*p)) return FALSE;
953 p++;
954 while (IS_DIGIT(*p)) p++;
955 if (*p == CHAR_RIGHT_CURLY_BRACKET) return TRUE;
956
957 if (*p++ != CHAR_COMMA) return FALSE;
958 if (*p == CHAR_RIGHT_CURLY_BRACKET) return TRUE;
959
960 if (!IS_DIGIT(*p)) return FALSE;
961 p++;
962 while (IS_DIGIT(*p)) p++;
963
964 return (*p == CHAR_RIGHT_CURLY_BRACKET);
965 }
966
967
968
969 /*************************************************
970 * Handle escapes *
971 *************************************************/
972
973 /* This function is called when a \ has been encountered. It either returns a
974 positive value for a simple escape such as \n, or 0 for a data character which
975 will be placed in chptr. A backreference to group n is returned as negative n.
976 When UTF-8 is enabled, a positive value greater than 255 may be returned in
977 chptr. On entry, ptr is pointing at the \. On exit, it is on the final
978 character of the escape sequence.
979
980 Arguments:
981 ptrptr points to the pattern position pointer
982 chptr points to a returned data character
983 errorcodeptr points to the errorcode variable
984 bracount number of previous extracting brackets
985 options the options bits
986 isclass TRUE if inside a character class
987
988 Returns: zero => a data character
989 positive => a special escape sequence
990 negative => a back reference
991 on error, errorcodeptr is set
992 */
993
994 static int
995 check_escape(const pcre_uchar **ptrptr, pcre_uint32 *chptr, int *errorcodeptr,
996 int bracount, int options, BOOL isclass)
997 {
998 /* PCRE_UTF16 has the same value as PCRE_UTF8. */
999 BOOL utf = (options & PCRE_UTF8) != 0;
1000 const pcre_uchar *ptr = *ptrptr + 1;
1001 pcre_uint32 c;
1002 int escape = 0;
1003 int i;
1004
1005 GETCHARINCTEST(c, ptr); /* Get character value, increment pointer */
1006 ptr--; /* Set pointer back to the last byte */
1007
1008 /* If backslash is at the end of the pattern, it's an error. */
1009
1010 if (c == CHAR_NULL) *errorcodeptr = ERR1;
1011
1012 /* Non-alphanumerics are literals. For digits or letters, do an initial lookup
1013 in a table. A non-zero result is something that can be returned immediately.
1014 Otherwise further processing may be required. */
1015
1016 #ifndef EBCDIC /* ASCII/UTF-8 coding */
1017 /* Not alphanumeric */
1018 else if (c < CHAR_0 || c > CHAR_z) {}
1019 else if ((i = escapes[c - CHAR_0]) != 0)
1020 { if (i > 0) c = (pcre_uint32)i; else escape = -i; }
1021
1022 #else /* EBCDIC coding */
1023 /* Not alphanumeric */
1024 else if (c < CHAR_a || (!MAX_255(c) || (ebcdic_chartab[c] & 0x0E) == 0)) {}
1025 else if ((i = escapes[c - 0x48]) != 0) { if (i > 0) c = (pcre_uint32)i; else escape = -i; }
1026 #endif
1027
1028 /* Escapes that need further processing, or are illegal. */
1029
1030 else
1031 {
1032 const pcre_uchar *oldptr;
1033 BOOL braced, negated, overflow;
1034 int s;
1035
1036 switch (c)
1037 {
1038 /* A number of Perl escapes are not handled by PCRE. We give an explicit
1039 error. */
1040
1041 case CHAR_l:
1042 case CHAR_L:
1043 *errorcodeptr = ERR37;
1044 break;
1045
1046 case CHAR_u:
1047 if ((options & PCRE_JAVASCRIPT_COMPAT) != 0)
1048 {
1049 /* In JavaScript, \u must be followed by four hexadecimal numbers.
1050 Otherwise it is a lowercase u letter. */
1051 if (MAX_255(ptr[1]) && (digitab[ptr[1]] & ctype_xdigit) != 0
1052 && MAX_255(ptr[2]) && (digitab[ptr[2]] & ctype_xdigit) != 0
1053 && MAX_255(ptr[3]) && (digitab[ptr[3]] & ctype_xdigit) != 0
1054 && MAX_255(ptr[4]) && (digitab[ptr[4]] & ctype_xdigit) != 0)
1055 {
1056 c = 0;
1057 for (i = 0; i < 4; ++i)
1058 {
1059 register pcre_uint32 cc = *(++ptr);
1060 #ifndef EBCDIC /* ASCII/UTF-8 coding */
1061 if (cc >= CHAR_a) cc -= 32; /* Convert to upper case */
1062 c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
1063 #else /* EBCDIC coding */
1064 if (cc >= CHAR_a && cc <= CHAR_z) cc += 64; /* Convert to upper case */
1065 c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
1066 #endif
1067 }
1068
1069 #if defined COMPILE_PCRE8
1070 if (c > (utf ? 0x10ffffU : 0xffU))
1071 #elif defined COMPILE_PCRE16
1072 if (c > (utf ? 0x10ffffU : 0xffffU))
1073 #elif defined COMPILE_PCRE32
1074 if (utf && c > 0x10ffffU)
1075 #endif
1076 {
1077 *errorcodeptr = ERR76;
1078 }
1079 else if (utf && c >= 0xd800 && c <= 0xdfff) *errorcodeptr = ERR73;
1080 }
1081 }
1082 else
1083 *errorcodeptr = ERR37;
1084 break;
1085
1086 case CHAR_U:
1087 /* In JavaScript, \U is an uppercase U letter. */
1088 if ((options & PCRE_JAVASCRIPT_COMPAT) == 0) *errorcodeptr = ERR37;
1089 break;
1090
1091 /* In a character class, \g is just a literal "g". Outside a character
1092 class, \g must be followed by one of a number of specific things:
1093
1094 (1) A number, either plain or braced. If positive, it is an absolute
1095 backreference. If negative, it is a relative backreference. This is a Perl
1096 5.10 feature.
1097
1098 (2) Perl 5.10 also supports \g{name} as a reference to a named group. This
1099 is part of Perl's movement towards a unified syntax for back references. As
1100 this is synonymous with \k{name}, we fudge it up by pretending it really
1101 was \k.
1102
1103 (3) For Oniguruma compatibility we also support \g followed by a name or a
1104 number either in angle brackets or in single quotes. However, these are
1105 (possibly recursive) subroutine calls, _not_ backreferences. Just return
1106 the ESC_g code (cf \k). */
1107
1108 case CHAR_g:
1109 if (isclass) break;
1110 if (ptr[1] == CHAR_LESS_THAN_SIGN || ptr[1] == CHAR_APOSTROPHE)
1111 {
1112 escape = ESC_g;
1113 break;
1114 }
1115
1116 /* Handle the Perl-compatible cases */
1117
1118 if (ptr[1] == CHAR_LEFT_CURLY_BRACKET)
1119 {
1120 const pcre_uchar *p;
1121 for (p = ptr+2; *p != CHAR_NULL && *p != CHAR_RIGHT_CURLY_BRACKET; p++)
1122 if (*p != CHAR_MINUS && !IS_DIGIT(*p)) break;
1123 if (*p != CHAR_NULL && *p != CHAR_RIGHT_CURLY_BRACKET)
1124 {
1125 escape = ESC_k;
1126 break;
1127 }
1128 braced = TRUE;
1129 ptr++;
1130 }
1131 else braced = FALSE;
1132
1133 if (ptr[1] == CHAR_MINUS)
1134 {
1135 negated = TRUE;
1136 ptr++;
1137 }
1138 else negated = FALSE;
1139
1140 /* The integer range is limited by the machine's int representation. */
1141 s = 0;
1142 overflow = FALSE;
1143 while (IS_DIGIT(ptr[1]))
1144 {
1145 if (s > INT_MAX / 10 - 1) /* Integer overflow */
1146 {
1147 overflow = TRUE;
1148 break;
1149 }
1150 s = s * 10 + (int)(*(++ptr) - CHAR_0);
1151 }
1152 if (overflow) /* Integer overflow */
1153 {
1154 while (IS_DIGIT(ptr[1]))
1155 ptr++;
1156 *errorcodeptr = ERR61;
1157 break;
1158 }
1159
1160 if (braced && *(++ptr) != CHAR_RIGHT_CURLY_BRACKET)
1161 {
1162 *errorcodeptr = ERR57;
1163 break;
1164 }
1165
1166 if (s == 0)
1167 {
1168 *errorcodeptr = ERR58;
1169 break;
1170 }
1171
1172 if (negated)
1173 {
1174 if (s > bracount)
1175 {
1176 *errorcodeptr = ERR15;
1177 break;
1178 }
1179 s = bracount - (s - 1);
1180 }
1181
1182 escape = -s;
1183 break;
1184
1185 /* The handling of escape sequences consisting of a string of digits
1186 starting with one that is not zero is not straightforward. Perl has changed
1187 over the years. Nowadays \g{} for backreferences and \o{} for octal are
1188 recommended to avoid the ambiguities in the old syntax.
1189
1190 Outside a character class, the digits are read as a decimal number. If the
1191 number is less than 8 (used to be 10), or if there are that many previous
1192 extracting left brackets, then it is a back reference. Otherwise, up to
1193 three octal digits are read to form an escaped byte. Thus \123 is likely to
1194 be octal 123 (cf \0123, which is octal 012 followed by the literal 3). If
1195 the octal value is greater than 377, the least significant 8 bits are
1196 taken. \8 and \9 are treated as the literal characters 8 and 9.
1197
1198 Inside a character class, \ followed by a digit is always either a literal
1199 8 or 9 or an octal number. */
1200
1201 case CHAR_1: case CHAR_2: case CHAR_3: case CHAR_4: case CHAR_5:
1202 case CHAR_6: case CHAR_7: case CHAR_8: case CHAR_9:
1203
1204 if (!isclass)
1205 {
1206 oldptr = ptr;
1207 /* The integer range is limited by the machine's int representation. */
1208 s = (int)(c -CHAR_0);
1209 overflow = FALSE;
1210 while (IS_DIGIT(ptr[1]))
1211 {
1212 if (s > INT_MAX / 10 - 1) /* Integer overflow */
1213 {
1214 overflow = TRUE;
1215 break;
1216 }
1217 s = s * 10 + (int)(*(++ptr) - CHAR_0);
1218 }
1219 if (overflow) /* Integer overflow */
1220 {
1221 while (IS_DIGIT(ptr[1]))
1222 ptr++;
1223 *errorcodeptr = ERR61;
1224 break;
1225 }
1226 if (s < 8 || s <= bracount) /* Check for back reference */
1227 {
1228 escape = -s;
1229 break;
1230 }
1231 ptr = oldptr; /* Put the pointer back and fall through */
1232 }
1233
1234 /* Handle a digit following \ when the number is not a back reference. If
1235 the first digit is 8 or 9, Perl used to generate a binary zero byte and
1236 then treat the digit as a following literal. At least by Perl 5.18 this
1237 changed so as not to insert the binary zero. */
1238
1239 if ((c = *ptr) >= CHAR_8) break;
1240
1241 /* Fall through with a digit less than 8 */
1242
1243 /* \0 always starts an octal number, but we may drop through to here with a
1244 larger first octal digit. The original code used just to take the least
1245 significant 8 bits of octal numbers (I think this is what early Perls used
1246 to do). Nowadays we allow for larger numbers in UTF-8 mode and 16-bit mode,
1247 but no more than 3 octal digits. */
1248
1249 case CHAR_0:
1250 c -= CHAR_0;
1251 while(i++ < 2 && ptr[1] >= CHAR_0 && ptr[1] <= CHAR_7)
1252 c = c * 8 + *(++ptr) - CHAR_0;
1253 #ifdef COMPILE_PCRE8
1254 if (!utf && c > 0xff) *errorcodeptr = ERR51;
1255 #endif
1256 break;
1257
1258 /* \o is a relatively new Perl feature, supporting a more general way of
1259 specifying character codes in octal. The only supported form is \o{ddd}. */
1260
1261 case CHAR_o:
1262 if (ptr[1] != CHAR_LEFT_CURLY_BRACKET) *errorcodeptr = ERR81; else
1263 if (ptr[2] == CHAR_RIGHT_CURLY_BRACKET) *errorcodeptr = ERR86; else
1264 {
1265 ptr += 2;
1266 c = 0;
1267 overflow = FALSE;
1268 while (*ptr >= CHAR_0 && *ptr <= CHAR_7)
1269 {
1270 register pcre_uint32 cc = *ptr++;
1271 if (c == 0 && cc == CHAR_0) continue; /* Leading zeroes */
1272 #ifdef COMPILE_PCRE32
1273 if (c >= 0x20000000l) { overflow = TRUE; break; }
1274 #endif
1275 c = (c << 3) + cc - CHAR_0 ;
1276 #if defined COMPILE_PCRE8
1277 if (c > (utf ? 0x10ffffU : 0xffU)) { overflow = TRUE; break; }
1278 #elif defined COMPILE_PCRE16
1279 if (c > (utf ? 0x10ffffU : 0xffffU)) { overflow = TRUE; break; }
1280 #elif defined COMPILE_PCRE32
1281 if (utf && c > 0x10ffffU) { overflow = TRUE; break; }
1282 #endif
1283 }
1284 if (overflow)
1285 {
1286 while (*ptr >= CHAR_0 && *ptr <= CHAR_7) ptr++;
1287 *errorcodeptr = ERR34;
1288 }
1289 else if (*ptr == CHAR_RIGHT_CURLY_BRACKET)
1290 {
1291 if (utf && c >= 0xd800 && c <= 0xdfff) *errorcodeptr = ERR73;
1292 }
1293 else *errorcodeptr = ERR80;
1294 }
1295 break;
1296
1297 /* \x is complicated. In JavaScript, \x must be followed by two hexadecimal
1298 numbers. Otherwise it is a lowercase x letter. */
1299
1300 case CHAR_x:
1301 if ((options & PCRE_JAVASCRIPT_COMPAT) != 0)
1302 {
1303 if (MAX_255(ptr[1]) && (digitab[ptr[1]] & ctype_xdigit) != 0
1304 && MAX_255(ptr[2]) && (digitab[ptr[2]] & ctype_xdigit) != 0)
1305 {
1306 c = 0;
1307 for (i = 0; i < 2; ++i)
1308 {
1309 register pcre_uint32 cc = *(++ptr);
1310 #ifndef EBCDIC /* ASCII/UTF-8 coding */
1311 if (cc >= CHAR_a) cc -= 32; /* Convert to upper case */
1312 c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
1313 #else /* EBCDIC coding */
1314 if (cc >= CHAR_a && cc <= CHAR_z) cc += 64; /* Convert to upper case */
1315 c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
1316 #endif
1317 }
1318 }
1319 } /* End JavaScript handling */
1320
1321 /* Handle \x in Perl's style. \x{ddd} is a character number which can be
1322 greater than 0xff in utf or non-8bit mode, but only if the ddd are hex
1323 digits. If not, { used to be treated as a data character. However, Perl
1324 seems to read hex digits up to the first non-such, and ignore the rest, so
1325 that, for example \x{zz} matches a binary zero. This seems crazy, so PCRE
1326 now gives an error. */
1327
1328 else
1329 {
1330 if (ptr[1] == CHAR_LEFT_CURLY_BRACKET)
1331 {
1332 ptr += 2;
1333 if (*ptr == CHAR_RIGHT_CURLY_BRACKET)
1334 {
1335 *errorcodeptr = ERR86;
1336 break;
1337 }
1338 c = 0;
1339 overflow = FALSE;
1340 while (MAX_255(*ptr) && (digitab[*ptr] & ctype_xdigit) != 0)
1341 {
1342 register pcre_uint32 cc = *ptr++;
1343 if (c == 0 && cc == CHAR_0) continue; /* Leading zeroes */
1344
1345 #ifdef COMPILE_PCRE32
1346 if (c >= 0x10000000l) { overflow = TRUE; break; }
1347 #endif
1348
1349 #ifndef EBCDIC /* ASCII/UTF-8 coding */
1350 if (cc >= CHAR_a) cc -= 32; /* Convert to upper case */
1351 c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
1352 #else /* EBCDIC coding */
1353 if (cc >= CHAR_a && cc <= CHAR_z) cc += 64; /* Convert to upper case */
1354 c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
1355 #endif
1356
1357 #if defined COMPILE_PCRE8
1358 if (c > (utf ? 0x10ffffU : 0xffU)) { overflow = TRUE; break; }
1359 #elif defined COMPILE_PCRE16
1360 if (c > (utf ? 0x10ffffU : 0xffffU)) { overflow = TRUE; break; }
1361 #elif defined COMPILE_PCRE32
1362 if (utf && c > 0x10ffffU) { overflow = TRUE; break; }
1363 #endif
1364 }
1365
1366 if (overflow)
1367 {
1368 while (MAX_255(*ptr) && (digitab[*ptr] & ctype_xdigit) != 0) ptr++;
1369 *errorcodeptr = ERR34;
1370 }
1371
1372 else if (*ptr == CHAR_RIGHT_CURLY_BRACKET)
1373 {
1374 if (utf && c >= 0xd800 && c <= 0xdfff) *errorcodeptr = ERR73;
1375 }
1376
1377 /* If the sequence of hex digits does not end with '}', give an error.
1378 We used just to recognize this construct and fall through to the normal
1379 \x handling, but nowadays Perl gives an error, which seems much more
1380 sensible, so we do too. */
1381
1382 else *errorcodeptr = ERR79;
1383 } /* End of \x{} processing */
1384
1385 /* Read a single-byte hex-defined char (up to two hex digits after \x) */
1386
1387 else
1388 {
1389 c = 0;
1390 while (i++ < 2 && MAX_255(ptr[1]) && (digitab[ptr[1]] & ctype_xdigit) != 0)
1391 {
1392 pcre_uint32 cc; /* Some compilers don't like */
1393 cc = *(++ptr); /* ++ in initializers */
1394 #ifndef EBCDIC /* ASCII/UTF-8 coding */
1395 if (cc >= CHAR_a) cc -= 32; /* Convert to upper case */
1396 c = c * 16 + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
1397 #else /* EBCDIC coding */
1398 if (cc <= CHAR_z) cc += 64; /* Convert to upper case */
1399 c = c * 16 + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
1400 #endif
1401 }
1402 } /* End of \xdd handling */
1403 } /* End of Perl-style \x handling */
1404 break;
1405
1406 /* For \c, a following letter is upper-cased; then the 0x40 bit is flipped.
1407 An error is given if the byte following \c is not an ASCII character. This
1408 coding is ASCII-specific, but then the whole concept of \cx is
1409 ASCII-specific. (However, an EBCDIC equivalent has now been added.) */
1410
1411 case CHAR_c:
1412 c = *(++ptr);
1413 if (c == CHAR_NULL)
1414 {
1415 *errorcodeptr = ERR2;
1416 break;
1417 }
1418 #ifndef EBCDIC /* ASCII/UTF-8 coding */
1419 if (c > 127) /* Excludes all non-ASCII in either mode */
1420 {
1421 *errorcodeptr = ERR68;
1422 break;
1423 }
1424 if (c >= CHAR_a && c <= CHAR_z) c -= 32;
1425 c ^= 0x40;
1426 #else /* EBCDIC coding */
1427 if (c >= CHAR_a && c <= CHAR_z) c += 64;
1428 c ^= 0xC0;
1429 #endif
1430 break;
1431
1432 /* PCRE_EXTRA enables extensions to Perl in the matter of escapes. Any
1433 other alphanumeric following \ is an error if PCRE_EXTRA was set;
1434 otherwise, for Perl compatibility, it is a literal. This code looks a bit
1435 odd, but there used to be some cases other than the default, and there may
1436 be again in future, so I haven't "optimized" it. */
1437
1438 default:
1439 if ((options & PCRE_EXTRA) != 0) switch(c)
1440 {
1441 default:
1442 *errorcodeptr = ERR3;
1443 break;
1444 }
1445 break;
1446 }
1447 }
1448
1449 /* Perl supports \N{name} for character names, as well as plain \N for "not
1450 newline". PCRE does not support \N{name}. However, it does support
1451 quantification such as \N{2,3}. */
1452
1453 if (escape == ESC_N && ptr[1] == CHAR_LEFT_CURLY_BRACKET &&
1454 !is_counted_repeat(ptr+2))
1455 *errorcodeptr = ERR37;
1456
1457 /* If PCRE_UCP is set, we change the values for \d etc. */
1458
1459 if ((options & PCRE_UCP) != 0 && escape >= ESC_D && escape <= ESC_w)
1460 escape += (ESC_DU - ESC_D);
1461
1462 /* Set the pointer to the final character before returning. */
1463
1464 *ptrptr = ptr;
1465 *chptr = c;
1466 return escape;
1467 }
1468
1469
1470
1471 #ifdef SUPPORT_UCP
1472 /*************************************************
1473 * Handle \P and \p *
1474 *************************************************/
1475
1476 /* This function is called after \P or \p has been encountered, provided that
1477 PCRE is compiled with support for Unicode properties. On entry, ptrptr is
1478 pointing at the P or p. On exit, it is pointing at the final character of the
1479 escape sequence.
1480
1481 Argument:
1482 ptrptr points to the pattern position pointer
1483 negptr points to a boolean that is set TRUE for negation else FALSE
1484 ptypeptr points to an unsigned int that is set to the type value
1485 pdataptr points to an unsigned int that is set to the detailed property value
1486 errorcodeptr points to the error code variable
1487
1488 Returns: TRUE if the type value was found, or FALSE for an invalid type
1489 */
1490
1491 static BOOL
1492 get_ucp(const pcre_uchar **ptrptr, BOOL *negptr, unsigned int *ptypeptr,
1493 unsigned int *pdataptr, int *errorcodeptr)
1494 {
1495 pcre_uchar c;
1496 int i, bot, top;
1497 const pcre_uchar *ptr = *ptrptr;
1498 pcre_uchar name[32];
1499
1500 c = *(++ptr);
1501 if (c == CHAR_NULL) goto ERROR_RETURN;
1502
1503 *negptr = FALSE;
1504
1505 /* \P or \p can be followed by a name in {}, optionally preceded by ^ for
1506 negation. */
1507
1508 if (c == CHAR_LEFT_CURLY_BRACKET)
1509 {
1510 if (ptr[1] == CHAR_CIRCUMFLEX_ACCENT)
1511 {
1512 *negptr = TRUE;
1513 ptr++;
1514 }
1515 for (i = 0; i < (int)(sizeof(name) / sizeof(pcre_uchar)) - 1; i++)
1516 {
1517 c = *(++ptr);
1518 if (c == CHAR_NULL) goto ERROR_RETURN;
1519 if (c == CHAR_RIGHT_CURLY_BRACKET) break;
1520 name[i] = c;
1521 }
1522 if (c != CHAR_RIGHT_CURLY_BRACKET) goto ERROR_RETURN;
1523 name[i] = 0;
1524 }
1525
1526 /* Otherwise there is just one following character */
1527
1528 else
1529 {
1530 name[0] = c;
1531 name[1] = 0;
1532 }
1533
1534 *ptrptr = ptr;
1535
1536 /* Search for a recognized property name using binary chop */
1537
1538 bot = 0;
1539 top = PRIV(utt_size);
1540
1541 while (bot < top)
1542 {
1543 int r;
1544 i = (bot + top) >> 1;
1545 r = STRCMP_UC_C8(name, PRIV(utt_names) + PRIV(utt)[i].name_offset);
1546 if (r == 0)
1547 {
1548 *ptypeptr = PRIV(utt)[i].type;
1549 *pdataptr = PRIV(utt)[i].value;
1550 return TRUE;
1551 }
1552 if (r > 0) bot = i + 1; else top = i;
1553 }
1554
1555 *errorcodeptr = ERR47;
1556 *ptrptr = ptr;
1557 return FALSE;
1558
1559 ERROR_RETURN:
1560 *errorcodeptr = ERR46;
1561 *ptrptr = ptr;
1562 return FALSE;
1563 }
1564 #endif
1565
1566
1567
1568 /*************************************************
1569 * Read repeat counts *
1570 *************************************************/
1571
1572 /* Read an item of the form {n,m} and return the values. This is called only
1573 after is_counted_repeat() has confirmed that a repeat-count quantifier exists,
1574 so the syntax is guaranteed to be correct, but we need to check the values.
1575
1576 Arguments:
1577 p pointer to first char after '{'
1578 minp pointer to int for min
1579 maxp pointer to int for max
1580 returned as -1 if no max
1581 errorcodeptr points to error code variable
1582
1583 Returns: pointer to '}' on success;
1584 current ptr on error, with errorcodeptr set non-zero
1585 */
1586
1587 static const pcre_uchar *
1588 read_repeat_counts(const pcre_uchar *p, int *minp, int *maxp, int *errorcodeptr)
1589 {
1590 int min = 0;
1591 int max = -1;
1592
1593 while (IS_DIGIT(*p))
1594 {
1595 min = min * 10 + (int)(*p++ - CHAR_0);
1596 if (min > 65535)
1597 {
1598 *errorcodeptr = ERR5;
1599 return p;
1600 }
1601 }
1602
1603 if (*p == CHAR_RIGHT_CURLY_BRACKET) max = min; else
1604 {
1605 if (*(++p) != CHAR_RIGHT_CURLY_BRACKET)
1606 {
1607 max = 0;
1608 while(IS_DIGIT(*p))
1609 {
1610 max = max * 10 + (int)(*p++ - CHAR_0);
1611 if (max > 65535)
1612 {
1613 *errorcodeptr = ERR5;
1614 return p;
1615 }
1616 }
1617 if (max < min)
1618 {
1619 *errorcodeptr = ERR4;
1620 return p;
1621 }
1622 }
1623 }
1624
1625 *minp = min;
1626 *maxp = max;
1627 return p;
1628 }
1629
1630
1631
1632 /*************************************************
1633 * Find first significant op code *
1634 *************************************************/
1635
1636 /* This is called by several functions that scan a compiled expression looking
1637 for a fixed first character, or an anchoring op code etc. It skips over things
1638 that do not influence this. For some calls, it makes sense to skip negative
1639 forward and all backward assertions, and also the \b assertion; for others it
1640 does not.
1641
1642 Arguments:
1643 code pointer to the start of the group
1644 skipassert TRUE if certain assertions are to be skipped
1645
1646 Returns: pointer to the first significant opcode
1647 */
1648
1649 static const pcre_uchar*
1650 first_significant_code(const pcre_uchar *code, BOOL skipassert)
1651 {
1652 for (;;)
1653 {
1654 switch ((int)*code)
1655 {
1656 case OP_ASSERT_NOT:
1657 case OP_ASSERTBACK:
1658 case OP_ASSERTBACK_NOT:
1659 if (!skipassert) return code;
1660 do code += GET(code, 1); while (*code == OP_ALT);
1661 code += PRIV(OP_lengths)[*code];
1662 break;
1663
1664 case OP_WORD_BOUNDARY:
1665 case OP_NOT_WORD_BOUNDARY:
1666 if (!skipassert) return code;
1667 /* Fall through */
1668
1669 case OP_CALLOUT:
1670 case OP_CREF:
1671 case OP_DNCREF:
1672 case OP_RREF:
1673 case OP_DNRREF:
1674 case OP_DEF:
1675 code += PRIV(OP_lengths)[*code];
1676 break;
1677
1678 default:
1679 return code;
1680 }
1681 }
1682 /* Control never reaches here */
1683 }
1684
1685
1686
1687 /*************************************************
1688 * Find the fixed length of a branch *
1689 *************************************************/
1690
1691 /* Scan a branch and compute the fixed length of subject that will match it,
1692 if the length is fixed. This is needed for dealing with backward assertions.
1693 In UTF8 mode, the result is in characters rather than bytes. The branch is
1694 temporarily terminated with OP_END when this function is called.
1695
1696 This function is called when a backward assertion is encountered, so that if it
1697 fails, the error message can point to the correct place in the pattern.
1698 However, we cannot do this when the assertion contains subroutine calls,
1699 because they can be forward references. We solve this by remembering this case
1700 and doing the check at the end; a flag specifies which mode we are running in.
1701
1702 Arguments:
1703 code points to the start of the pattern (the bracket)
1704 utf TRUE in UTF-8 / UTF-16 / UTF-32 mode
1705 atend TRUE if called when the pattern is complete
1706 cd the "compile data" structure
1707
1708 Returns: the fixed length,
1709 or -1 if there is no fixed length,
1710 or -2 if \C was encountered (in UTF-8 mode only)
1711 or -3 if an OP_RECURSE item was encountered and atend is FALSE
1712 or -4 if an unknown opcode was encountered (internal error)
1713 */
1714
1715 static int
1716 find_fixedlength(pcre_uchar *code, BOOL utf, BOOL atend, compile_data *cd)
1717 {
1718 int length = -1;
1719
1720 register int branchlength = 0;
1721 register pcre_uchar *cc = code + 1 + LINK_SIZE;
1722
1723 /* Scan along the opcodes for this branch. If we get to the end of the
1724 branch, check the length against that of the other branches. */
1725
1726 for (;;)
1727 {
1728 int d;
1729 pcre_uchar *ce, *cs;
1730 register pcre_uchar op = *cc;
1731
1732 switch (op)
1733 {
1734 /* We only need to continue for OP_CBRA (normal capturing bracket) and
1735 OP_BRA (normal non-capturing bracket) because the other variants of these
1736 opcodes are all concerned with unlimited repeated groups, which of course
1737 are not of fixed length. */
1738
1739 case OP_CBRA:
1740 case OP_BRA:
1741 case OP_ONCE:
1742 case OP_ONCE_NC:
1743 case OP_COND:
1744 d = find_fixedlength(cc + ((op == OP_CBRA)? IMM2_SIZE : 0), utf, atend, cd);
1745 if (d < 0) return d;
1746 branchlength += d;
1747 do cc += GET(cc, 1); while (*cc == OP_ALT);
1748 cc += 1 + LINK_SIZE;
1749 break;
1750
1751 /* Reached end of a branch; if it's a ket it is the end of a nested call.
1752 If it's ALT it is an alternation in a nested call. An ACCEPT is effectively
1753 an ALT. If it is END it's the end of the outer call. All can be handled by
1754 the same code. Note that we must not include the OP_KETRxxx opcodes here,
1755 because they all imply an unlimited repeat. */
1756
1757 case OP_ALT:
1758 case OP_KET:
1759 case OP_END:
1760 case OP_ACCEPT:
1761 case OP_ASSERT_ACCEPT:
1762 if (length < 0) length = branchlength;
1763 else if (length != branchlength) return -1;
1764 if (*cc != OP_ALT) return length;
1765 cc += 1 + LINK_SIZE;
1766 branchlength = 0;
1767 break;
1768
1769 /* A true recursion implies not fixed length, but a subroutine call may
1770 be OK. If the subroutine is a forward reference, we can't deal with
1771 it until the end of the pattern, so return -3. */
1772
1773 case OP_RECURSE:
1774 if (!atend) return -3;
1775 cs = ce = (pcre_uchar *)cd->start_code + GET(cc, 1); /* Start subpattern */
1776 do ce += GET(ce, 1); while (*ce == OP_ALT); /* End subpattern */
1777 if (cc > cs && cc < ce) return -1; /* Recursion */
1778 d = find_fixedlength(cs + IMM2_SIZE, utf, atend, cd);
1779 if (d < 0) return d;
1780 branchlength += d;
1781 cc += 1 + LINK_SIZE;
1782 break;
1783
1784 /* Skip over assertive subpatterns */
1785
1786 case OP_ASSERT:
1787 case OP_ASSERT_NOT:
1788 case OP_ASSERTBACK:
1789 case OP_ASSERTBACK_NOT:
1790 do cc += GET(cc, 1); while (*cc == OP_ALT);
1791 cc += PRIV(OP_lengths)[*cc];
1792 break;
1793
1794 /* Skip over things that don't match chars */
1795
1796 case OP_MARK:
1797 case OP_PRUNE_ARG:
1798 case OP_SKIP_ARG:
1799 case OP_THEN_ARG:
1800 cc += cc[1] + PRIV(OP_lengths)[*cc];
1801 break;
1802
1803 case OP_CALLOUT:
1804 case OP_CIRC:
1805 case OP_CIRCM:
1806 case OP_CLOSE:
1807 case OP_COMMIT:
1808 case OP_CREF:
1809 case OP_DEF:
1810 case OP_DNCREF:
1811 case OP_DNRREF:
1812 case OP_DOLL:
1813 case OP_DOLLM:
1814 case OP_EOD:
1815 case OP_EODN:
1816 case OP_FAIL:
1817 case OP_NOT_WORD_BOUNDARY:
1818 case OP_PRUNE:
1819 case OP_REVERSE:
1820 case OP_RREF:
1821 case OP_SET_SOM:
1822 case OP_SKIP:
1823 case OP_SOD:
1824 case OP_SOM:
1825 case OP_THEN:
1826 case OP_WORD_BOUNDARY:
1827 cc += PRIV(OP_lengths)[*cc];
1828 break;
1829
1830 /* Handle literal characters */
1831
1832 case OP_CHAR:
1833 case OP_CHARI:
1834 case OP_NOT:
1835 case OP_NOTI:
1836 branchlength++;
1837 cc += 2;
1838 #ifdef SUPPORT_UTF
1839 if (utf && HAS_EXTRALEN(cc[-1])) cc += GET_EXTRALEN(cc[-1]);
1840 #endif
1841 break;
1842
1843 /* Handle exact repetitions. The count is already in characters, but we
1844 need to skip over a multibyte character in UTF8 mode. */
1845
1846 case OP_EXACT:
1847 case OP_EXACTI:
1848 case OP_NOTEXACT:
1849 case OP_NOTEXACTI:
1850 branchlength += (int)GET2(cc,1);
1851 cc += 2 + IMM2_SIZE;
1852 #ifdef SUPPORT_UTF
1853 if (utf && HAS_EXTRALEN(cc[-1])) cc += GET_EXTRALEN(cc[-1]);
1854 #endif
1855 break;
1856
1857 case OP_TYPEEXACT:
1858 branchlength += GET2(cc,1);
1859 if (cc[1 + IMM2_SIZE] == OP_PROP || cc[1 + IMM2_SIZE] == OP_NOTPROP)
1860 cc += 2;
1861 cc += 1 + IMM2_SIZE + 1;
1862 break;
1863
1864 /* Handle single-char matchers */
1865
1866 case OP_PROP:
1867 case OP_NOTPROP:
1868 cc += 2;
1869 /* Fall through */
1870
1871 case OP_HSPACE:
1872 case OP_VSPACE:
1873 case OP_NOT_HSPACE:
1874 case OP_NOT_VSPACE:
1875 case OP_NOT_DIGIT:
1876 case OP_DIGIT:
1877 case OP_NOT_WHITESPACE:
1878 case OP_WHITESPACE:
1879 case OP_NOT_WORDCHAR:
1880 case OP_WORDCHAR:
1881 case OP_ANY:
1882 case OP_ALLANY:
1883 branchlength++;
1884 cc++;
1885 break;
1886
1887 /* The single-byte matcher isn't allowed. This only happens in UTF-8 mode;
1888 otherwise \C is coded as OP_ALLANY. */
1889
1890 case OP_ANYBYTE:
1891 return -2;
1892
1893 /* Check a class for variable quantification */
1894
1895 case OP_CLASS:
1896 case OP_NCLASS:
1897 #if defined SUPPORT_UTF || defined COMPILE_PCRE16 || defined COMPILE_PCRE32
1898 case OP_XCLASS:
1899 /* The original code caused an unsigned overflow in 64 bit systems,
1900 so now we use a conditional statement. */
1901 if (op == OP_XCLASS)
1902 cc += GET(cc, 1);
1903 else
1904 cc += PRIV(OP_lengths)[OP_CLASS];
1905 #else
1906 cc += PRIV(OP_lengths)[OP_CLASS];
1907 #endif
1908
1909 switch (*cc)
1910 {
1911 case OP_CRSTAR:
1912 case OP_CRMINSTAR:
1913 case OP_CRPLUS:
1914 case OP_CRMINPLUS:
1915 case OP_CRQUERY:
1916 case OP_CRMINQUERY:
1917 case OP_CRPOSSTAR:
1918 case OP_CRPOSPLUS:
1919 case OP_CRPOSQUERY:
1920 return -1;
1921
1922 case OP_CRRANGE:
1923 case OP_CRMINRANGE:
1924 case OP_CRPOSRANGE:
1925 if (GET2(cc,1) != GET2(cc,1+IMM2_SIZE)) return -1;
1926 branchlength += (int)GET2(cc,1);
1927 cc += 1 + 2 * IMM2_SIZE;
1928 break;
1929
1930 default:
1931 branchlength++;
1932 }
1933 break;
1934
1935 /* Anything else is variable length */
1936
1937 case OP_ANYNL:
1938 case OP_BRAMINZERO:
1939 case OP_BRAPOS:
1940 case OP_BRAPOSZERO:
1941 case OP_BRAZERO:
1942 case OP_CBRAPOS:
1943 case OP_EXTUNI:
1944 case OP_KETRMAX:
1945 case OP_KETRMIN:
1946 case OP_KETRPOS:
1947 case OP_MINPLUS:
1948 case OP_MINPLUSI:
1949 case OP_MINQUERY:
1950 case OP_MINQUERYI:
1951 case OP_MINSTAR:
1952 case OP_MINSTARI:
1953 case OP_MINUPTO:
1954 case OP_MINUPTOI:
1955 case OP_NOTMINPLUS:
1956 case OP_NOTMINPLUSI:
1957 case OP_NOTMINQUERY:
1958 case OP_NOTMINQUERYI:
1959 case OP_NOTMINSTAR:
1960 case OP_NOTMINSTARI:
1961 case OP_NOTMINUPTO:
1962 case OP_NOTMINUPTOI:
1963 case OP_NOTPLUS:
1964 case OP_NOTPLUSI:
1965 case OP_NOTPOSPLUS:
1966 case OP_NOTPOSPLUSI:
1967 case OP_NOTPOSQUERY:
1968 case OP_NOTPOSQUERYI:
1969 case OP_NOTPOSSTAR:
1970 case OP_NOTPOSSTARI:
1971 case OP_NOTPOSUPTO:
1972 case OP_NOTPOSUPTOI:
1973 case OP_NOTQUERY:
1974 case OP_NOTQUERYI:
1975 case OP_NOTSTAR:
1976 case OP_NOTSTARI:
1977 case OP_NOTUPTO:
1978 case OP_NOTUPTOI:
1979 case OP_PLUS:
1980 case OP_PLUSI:
1981 case OP_POSPLUS:
1982 case OP_POSPLUSI:
1983 case OP_POSQUERY:
1984 case OP_POSQUERYI:
1985 case OP_POSSTAR:
1986 case OP_POSSTARI:
1987 case OP_POSUPTO:
1988 case OP_POSUPTOI:
1989 case OP_QUERY:
1990 case OP_QUERYI:
1991 case OP_REF:
1992 case OP_REFI:
1993 case OP_DNREF:
1994 case OP_DNREFI:
1995 case OP_SBRA:
1996 case OP_SBRAPOS:
1997 case OP_SCBRA:
1998 case OP_SCBRAPOS:
1999 case OP_SCOND:
2000 case OP_SKIPZERO:
2001 case OP_STAR:
2002 case OP_STARI:
2003 case OP_TYPEMINPLUS:
2004 case OP_TYPEMINQUERY:
2005 case OP_TYPEMINSTAR:
2006 case OP_TYPEMINUPTO:
2007 case OP_TYPEPLUS:
2008 case OP_TYPEPOSPLUS:
2009 case OP_TYPEPOSQUERY:
2010 case OP_TYPEPOSSTAR:
2011 case OP_TYPEPOSUPTO:
2012 case OP_TYPEQUERY:
2013 case OP_TYPESTAR:
2014 case OP_TYPEUPTO:
2015 case OP_UPTO:
2016 case OP_UPTOI:
2017 return -1;
2018
2019 /* Catch unrecognized opcodes so that when new ones are added they
2020 are not forgotten, as has happened in the past. */
2021
2022 default:
2023 return -4;
2024 }
2025 }
2026 /* Control never gets here */
2027 }
2028
2029
2030
2031 /*************************************************
2032 * Scan compiled regex for specific bracket *
2033 *************************************************/
2034
2035 /* This little function scans through a compiled pattern until it finds a
2036 capturing bracket with the given number, or, if the number is negative, an
2037 instance of OP_REVERSE for a lookbehind. The function is global in the C sense
2038 so that it can be called from pcre_study() when finding the minimum matching
2039 length.
2040
2041 Arguments:
2042 code points to start of expression
2043 utf TRUE in UTF-8 / UTF-16 / UTF-32 mode
2044 number the required bracket number or negative to find a lookbehind
2045
2046 Returns: pointer to the opcode for the bracket, or NULL if not found
2047 */
2048
2049 const pcre_uchar *
2050 PRIV(find_bracket)(const pcre_uchar *code, BOOL utf, int number)
2051 {
2052 for (;;)
2053 {
2054 register pcre_uchar c = *code;
2055
2056 if (c == OP_END) return NULL;
2057
2058 /* XCLASS is used for classes that cannot be represented just by a bit
2059 map. This includes negated single high-valued characters. The length in
2060 the table is zero; the actual length is stored in the compiled code. */
2061
2062 if (c == OP_XCLASS) code += GET(code, 1);
2063
2064 /* Handle recursion */
2065
2066 else if (c == OP_REVERSE)
2067 {
2068 if (number < 0) return (pcre_uchar *)code;
2069 code += PRIV(OP_lengths)[c];
2070 }
2071
2072 /* Handle capturing bracket */
2073
2074 else if (c == OP_CBRA || c == OP_SCBRA ||
2075 c == OP_CBRAPOS || c == OP_SCBRAPOS)
2076 {
2077 int n = (int)GET2(code, 1+LINK_SIZE);
2078 if (n == number) return (pcre_uchar *)code;
2079 code += PRIV(OP_lengths)[c];
2080 }
2081
2082 /* Otherwise, we can get the item's length from the table, except that for
2083 repeated character types, we have to test for \p and \P, which have an extra
2084 two bytes of parameters, and for MARK/PRUNE/SKIP/THEN with an argument, we
2085 must add in its length. */
2086
2087 else
2088 {
2089 switch(c)
2090 {
2091 case OP_TYPESTAR:
2092 case OP_TYPEMINSTAR:
2093 case OP_TYPEPLUS:
2094 case OP_TYPEMINPLUS:
2095 case OP_TYPEQUERY:
2096 case OP_TYPEMINQUERY:
2097 case OP_TYPEPOSSTAR:
2098 case OP_TYPEPOSPLUS:
2099 case OP_TYPEPOSQUERY:
2100 if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2;
2101 break;
2102
2103 case OP_TYPEUPTO:
2104 case OP_TYPEMINUPTO:
2105 case OP_TYPEEXACT:
2106 case OP_TYPEPOSUPTO:
2107 if (code[1 + IMM2_SIZE] == OP_PROP || code[1 + IMM2_SIZE] == OP_NOTPROP)
2108 code += 2;
2109 break;
2110
2111 case OP_MARK:
2112 case OP_PRUNE_ARG:
2113 case OP_SKIP_ARG:
2114 case OP_THEN_ARG:
2115 code += code[1];
2116 break;
2117 }
2118
2119 /* Add in the fixed length from the table */
2120
2121 code += PRIV(OP_lengths)[c];
2122
2123 /* In UTF-8 mode, opcodes that are followed by a character may be followed by
2124 a multi-byte character. The length in the table is a minimum, so we have to
2125 arrange to skip the extra bytes. */
2126
2127 #if defined SUPPORT_UTF && !defined COMPILE_PCRE32
2128 if (utf) switch(c)
2129 {
2130 case OP_CHAR:
2131 case OP_CHARI:
2132 case OP_EXACT:
2133 case OP_EXACTI:
2134 case OP_UPTO:
2135 case OP_UPTOI:
2136 case OP_MINUPTO:
2137 case OP_MINUPTOI:
2138 case OP_POSUPTO:
2139 case OP_POSUPTOI:
2140 case OP_STAR:
2141 case OP_STARI:
2142 case OP_MINSTAR:
2143 case OP_MINSTARI:
2144 case OP_POSSTAR:
2145 case OP_POSSTARI:
2146 case OP_PLUS:
2147 case OP_PLUSI:
2148 case OP_MINPLUS:
2149 case OP_MINPLUSI:
2150 case OP_POSPLUS:
2151 case OP_POSPLUSI:
2152 case OP_QUERY:
2153 case OP_QUERYI:
2154 case OP_MINQUERY:
2155 case OP_MINQUERYI:
2156 case OP_POSQUERY:
2157 case OP_POSQUERYI:
2158 if (HAS_EXTRALEN(code[-1])) code += GET_EXTRALEN(code[-1]);
2159 break;
2160 }
2161 #else
2162 (void)(utf); /* Keep compiler happy by referencing function argument */
2163 #endif
2164 }
2165 }
2166 }
2167
2168
2169
2170 /*************************************************
2171 * Scan compiled regex for recursion reference *
2172 *************************************************/
2173
2174 /* This little function scans through a compiled pattern until it finds an
2175 instance of OP_RECURSE.
2176
2177 Arguments:
2178 code points to start of expression
2179 utf TRUE in UTF-8 / UTF-16 / UTF-32 mode
2180
2181 Returns: pointer to the opcode for OP_RECURSE, or NULL if not found
2182 */
2183
2184 static const pcre_uchar *
2185 find_recurse(const pcre_uchar *code, BOOL utf)
2186 {
2187 for (;;)
2188 {
2189 register pcre_uchar c = *code;
2190 if (c == OP_END) return NULL;
2191 if (c == OP_RECURSE) return code;
2192
2193 /* XCLASS is used for classes that cannot be represented just by a bit
2194 map. This includes negated single high-valued characters. The length in
2195 the table is zero; the actual length is stored in the compiled code. */
2196
2197 if (c == OP_XCLASS) code += GET(code, 1);
2198
2199 /* Otherwise, we can get the item's length from the table, except that for
2200 repeated character types, we have to test for \p and \P, which have an extra
2201 two bytes of parameters, and for MARK/PRUNE/SKIP/THEN with an argument, we
2202 must add in its length. */
2203
2204 else
2205 {
2206 switch(c)
2207 {
2208 case OP_TYPESTAR:
2209 case OP_TYPEMINSTAR:
2210 case OP_TYPEPLUS:
2211 case OP_TYPEMINPLUS:
2212 case OP_TYPEQUERY:
2213 case OP_TYPEMINQUERY:
2214 case OP_TYPEPOSSTAR:
2215 case OP_TYPEPOSPLUS:
2216 case OP_TYPEPOSQUERY:
2217 if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2;
2218 break;
2219
2220 case OP_TYPEPOSUPTO:
2221 case OP_TYPEUPTO:
2222 case OP_TYPEMINUPTO:
2223 case OP_TYPEEXACT:
2224 if (code[1 + IMM2_SIZE] == OP_PROP || code[1 + IMM2_SIZE] == OP_NOTPROP)
2225 code += 2;
2226 break;
2227
2228 case OP_MARK:
2229 case OP_PRUNE_ARG:
2230 case OP_SKIP_ARG:
2231 case OP_THEN_ARG:
2232 code += code[1];
2233 break;
2234 }
2235
2236 /* Add in the fixed length from the table */
2237
2238 code += PRIV(OP_lengths)[c];
2239
2240 /* In UTF-8 mode, opcodes that are followed by a character may be followed
2241 by a multi-byte character. The length in the table is a minimum, so we have
2242 to arrange to skip the extra bytes. */
2243
2244 #if defined SUPPORT_UTF && !defined COMPILE_PCRE32
2245 if (utf) switch(c)
2246 {
2247 case OP_CHAR:
2248 case OP_CHARI:
2249 case OP_NOT:
2250 case OP_NOTI:
2251 case OP_EXACT:
2252 case OP_EXACTI:
2253 case OP_NOTEXACT:
2254 case OP_NOTEXACTI:
2255 case OP_UPTO:
2256 case OP_UPTOI:
2257 case OP_NOTUPTO:
2258 case OP_NOTUPTOI:
2259 case OP_MINUPTO:
2260 case OP_MINUPTOI:
2261 case OP_NOTMINUPTO:
2262 case OP_NOTMINUPTOI:
2263 case OP_POSUPTO:
2264 case OP_POSUPTOI:
2265 case OP_NOTPOSUPTO:
2266 case OP_NOTPOSUPTOI:
2267 case OP_STAR:
2268 case OP_STARI:
2269 case OP_NOTSTAR:
2270 case OP_NOTSTARI:
2271 case OP_MINSTAR:
2272 case OP_MINSTARI:
2273 case OP_NOTMINSTAR:
2274 case OP_NOTMINSTARI:
2275 case OP_POSSTAR:
2276 case OP_POSSTARI:
2277 case OP_NOTPOSSTAR:
2278 case OP_NOTPOSSTARI:
2279 case OP_PLUS:
2280 case OP_PLUSI:
2281 case OP_NOTPLUS:
2282 case OP_NOTPLUSI:
2283 case OP_MINPLUS:
2284 case OP_MINPLUSI:
2285 case OP_NOTMINPLUS:
2286 case OP_NOTMINPLUSI:
2287 case OP_POSPLUS:
2288 case OP_POSPLUSI:
2289 case OP_NOTPOSPLUS:
2290 case OP_NOTPOSPLUSI:
2291 case OP_QUERY:
2292 case OP_QUERYI:
2293 case OP_NOTQUERY:
2294 case OP_NOTQUERYI:
2295 case OP_MINQUERY:
2296 case OP_MINQUERYI:
2297 case OP_NOTMINQUERY:
2298 case OP_NOTMINQUERYI:
2299 case OP_POSQUERY:
2300 case OP_POSQUERYI:
2301 case OP_NOTPOSQUERY:
2302 case OP_NOTPOSQUERYI:
2303 if (HAS_EXTRALEN(code[-1])) code += GET_EXTRALEN(code[-1]);
2304 break;
2305 }
2306 #else
2307 (void)(utf); /* Keep compiler happy by referencing function argument */
2308 #endif
2309 }
2310 }
2311 }
2312
2313
2314
2315 /*************************************************
2316 * Scan compiled branch for non-emptiness *
2317 *************************************************/
2318
2319 /* This function scans through a branch of a compiled pattern to see whether it
2320 can match the empty string or not. It is called from could_be_empty()
2321 below and from compile_branch() when checking for an unlimited repeat of a
2322 group that can match nothing. Note that first_significant_code() skips over
2323 backward and negative forward assertions when its final argument is TRUE. If we
2324 hit an unclosed bracket, we return "empty" - this means we've struck an inner
2325 bracket whose current branch will already have been scanned.
2326
2327 Arguments:
2328 code points to start of search
2329 endcode points to where to stop
2330 utf TRUE if in UTF-8 / UTF-16 / UTF-32 mode
2331 cd contains pointers to tables etc.
2332 recurses chain of recurse_check to catch mutual recursion
2333
2334 Returns: TRUE if what is matched could be empty
2335 */
2336
2337 typedef struct recurse_check {
2338 struct recurse_check *prev;
2339 const pcre_uchar *group;
2340 } recurse_check;
2341
2342 static BOOL
2343 could_be_empty_branch(const pcre_uchar *code, const pcre_uchar *endcode,
2344 BOOL utf, compile_data *cd, recurse_check *recurses)
2345 {
2346 register pcre_uchar c;
2347 recurse_check this_recurse;
2348
2349 for (code = first_significant_code(code + PRIV(OP_lengths)[*code], TRUE);
2350 code < endcode;
2351 code = first_significant_code(code + PRIV(OP_lengths)[c], TRUE))
2352 {
2353 const pcre_uchar *ccode;
2354
2355 c = *code;
2356
2357 /* Skip over forward assertions; the other assertions are skipped by
2358 first_significant_code() with a TRUE final argument. */
2359
2360 if (c == OP_ASSERT)
2361 {
2362 do code += GET(code, 1); while (*code == OP_ALT);
2363 c = *code;
2364 continue;
2365 }
2366
2367 /* For a recursion/subroutine call, if its end has been reached, which
2368 implies a backward reference subroutine call, we can scan it. If it's a
2369 forward reference subroutine call, we can't. To detect forward reference
2370 we have to scan up the list that is kept in the workspace. This function is
2371 called only when doing the real compile, not during the pre-compile that
2372 measures the size of the compiled pattern. */
2373
2374 if (c == OP_RECURSE)
2375 {
2376 const pcre_uchar *scode = cd->start_code + GET(code, 1);
2377 const pcre_uchar *endgroup = scode;
2378 BOOL empty_branch;
2379
2380 /* Test for forward reference or uncompleted reference. This is disabled
2381 when called to scan a completed pattern by setting cd->start_workspace to
2382 NULL. */
2383
2384 if (cd->start_workspace != NULL)
2385 {
2386 const pcre_uchar *tcode;
2387 for (tcode = cd->start_workspace; tcode < cd->hwm; tcode += LINK_SIZE)
2388 if ((int)GET(tcode, 0) == (int)(code + 1 - cd->start_code)) return TRUE;
2389 if (GET(scode, 1) == 0) return TRUE; /* Unclosed */
2390 }
2391
2392 /* If the reference is to a completed group, we need to detect whether this
2393 is a recursive call, as otherwise there will be an infinite loop. If it is
2394 a recursion, just skip over it. Simple recursions are easily detected. For
2395 mutual recursions we keep a chain on the stack. */
2396
2397 do endgroup += GET(endgroup, 1); while (*endgroup == OP_ALT);
2398 if (code >= scode && code <= endgroup) continue; /* Simple recursion */
2399 else
2400 {
2401 recurse_check *r = recurses;
2402 for (r = recurses; r != NULL; r = r->prev)
2403 if (r->group == scode) break;
2404 if (r != NULL) continue; /* Mutual recursion */
2405 }
2406
2407 /* Completed reference; scan the referenced group, remembering it on the
2408 stack chain to detect mutual recursions. */
2409
2410 empty_branch = FALSE;
2411 this_recurse.prev = recurses;
2412 this_recurse.group = scode;
2413
2414 do
2415 {
2416 if (could_be_empty_branch(scode, endcode, utf, cd, &this_recurse))
2417 {
2418 empty_branch = TRUE;
2419 break;
2420 }
2421 scode += GET(scode, 1);
2422 }
2423 while (*scode == OP_ALT);
2424
2425 if (!empty_branch) return FALSE; /* All branches are non-empty */
2426 continue;
2427 }
2428
2429 /* Groups with zero repeats can of course be empty; skip them. */
2430
2431 if (c == OP_BRAZERO || c == OP_BRAMINZERO || c == OP_SKIPZERO ||
2432 c == OP_BRAPOSZERO)
2433 {
2434 code += PRIV(OP_lengths)[c];
2435 do code += GET(code, 1); while (*code == OP_ALT);
2436 c = *code;
2437 continue;
2438 }
2439
2440 /* A nested group that is already marked as "could be empty" can just be
2441 skipped. */
2442
2443 if (c == OP_SBRA || c == OP_SBRAPOS ||
2444 c == OP_SCBRA || c == OP_SCBRAPOS)
2445 {
2446 do code += GET(code, 1); while (*code == OP_ALT);
2447 c = *code;
2448 continue;
2449 }
2450
2451 /* For other groups, scan the branches. */
2452
2453 if (c == OP_BRA || c == OP_BRAPOS ||
2454 c == OP_CBRA || c == OP_CBRAPOS ||
2455 c == OP_ONCE || c == OP_ONCE_NC ||
2456 c == OP_COND)
2457 {
2458 BOOL empty_branch;
2459 if (GET(code, 1) == 0) return TRUE; /* Hit unclosed bracket */
2460
2461 /* If a conditional group has only one branch, there is a second, implied,
2462 empty branch, so just skip over the conditional, because it could be empty.
2463 Otherwise, scan the individual branches of the group. */
2464
2465 if (c == OP_COND && code[GET(code, 1)] != OP_ALT)
2466 code += GET(code, 1);
2467 else
2468 {
2469 empty_branch = FALSE;
2470 do
2471 {
2472 if (!empty_branch && could_be_empty_branch(code, endcode, utf, cd, NULL))
2473 empty_branch = TRUE;
2474 code += GET(code, 1);
2475 }
2476 while (*code == OP_ALT);
2477 if (!empty_branch) return FALSE; /* All branches are non-empty */
2478 }
2479
2480 c = *code;
2481 continue;
2482 }
2483
2484 /* Handle the other opcodes */
2485
2486 switch (c)
2487 {
2488 /* Check for quantifiers after a class. XCLASS is used for classes that
2489 cannot be represented just by a bit map. This includes negated single
2490 high-valued characters. The length in PRIV(OP_lengths)[] is zero; the
2491 actual length is stored in the compiled code, so we must update "code"
2492 here. */
2493
2494 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
2495 case OP_XCLASS:
2496 ccode = code += GET(code, 1);
2497 goto CHECK_CLASS_REPEAT;
2498 #endif
2499
2500 case OP_CLASS:
2501 case OP_NCLASS:
2502 ccode = code + PRIV(OP_lengths)[OP_CLASS];
2503
2504 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
2505 CHECK_CLASS_REPEAT:
2506 #endif
2507
2508 switch (*ccode)
2509 {
2510 case OP_CRSTAR: /* These could be empty; continue */
2511 case OP_CRMINSTAR:
2512 case OP_CRQUERY:
2513 case OP_CRMINQUERY:
2514 case OP_CRPOSSTAR:
2515 case OP_CRPOSQUERY:
2516 break;
2517
2518 default: /* Non-repeat => class must match */
2519 case OP_CRPLUS: /* These repeats aren't empty */
2520 case OP_CRMINPLUS:
2521 case OP_CRPOSPLUS:
2522 return FALSE;
2523
2524 case OP_CRRANGE:
2525 case OP_CRMINRANGE:
2526 case OP_CRPOSRANGE:
2527 if (GET2(ccode, 1) > 0) return FALSE; /* Minimum > 0 */
2528 break;
2529 }
2530 break;
2531
2532 /* Opcodes that must match a character */
2533
2534 case OP_ANY:
2535 case OP_ALLANY:
2536 case OP_ANYBYTE:
2537
2538 case OP_PROP:
2539 case OP_NOTPROP:
2540 case OP_ANYNL:
2541
2542 case OP_NOT_HSPACE:
2543 case OP_HSPACE:
2544 case OP_NOT_VSPACE:
2545 case OP_VSPACE:
2546 case OP_EXTUNI:
2547
2548 case OP_NOT_DIGIT:
2549 case OP_DIGIT:
2550 case OP_NOT_WHITESPACE:
2551 case OP_WHITESPACE:
2552 case OP_NOT_WORDCHAR:
2553 case OP_WORDCHAR:
2554
2555 case OP_CHAR:
2556 case OP_CHARI:
2557 case OP_NOT:
2558 case OP_NOTI:
2559
2560 case OP_PLUS:
2561 case OP_PLUSI:
2562 case OP_MINPLUS:
2563 case OP_MINPLUSI:
2564
2565 case OP_NOTPLUS:
2566 case OP_NOTPLUSI:
2567 case OP_NOTMINPLUS:
2568 case OP_NOTMINPLUSI:
2569
2570 case OP_POSPLUS:
2571 case OP_POSPLUSI:
2572 case OP_NOTPOSPLUS:
2573 case OP_NOTPOSPLUSI:
2574
2575 case OP_EXACT:
2576 case OP_EXACTI:
2577 case OP_NOTEXACT:
2578 case OP_NOTEXACTI:
2579
2580 case OP_TYPEPLUS:
2581 case OP_TYPEMINPLUS:
2582 case OP_TYPEPOSPLUS:
2583 case OP_TYPEEXACT:
2584
2585 return FALSE;
2586
2587 /* These are going to continue, as they may be empty, but we have to
2588 fudge the length for the \p and \P cases. */
2589
2590 case OP_TYPESTAR:
2591 case OP_TYPEMINSTAR:
2592 case OP_TYPEPOSSTAR:
2593 case OP_TYPEQUERY:
2594 case OP_TYPEMINQUERY:
2595 case OP_TYPEPOSQUERY:
2596 if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2;
2597 break;
2598
2599 /* Same for these */
2600
2601 case OP_TYPEUPTO:
2602 case OP_TYPEMINUPTO:
2603 case OP_TYPEPOSUPTO:
2604 if (code[1 + IMM2_SIZE] == OP_PROP || code[1 + IMM2_SIZE] == OP_NOTPROP)
2605 code += 2;
2606 break;
2607
2608 /* End of branch */
2609
2610 case OP_KET:
2611 case OP_KETRMAX:
2612 case OP_KETRMIN:
2613 case OP_KETRPOS:
2614 case OP_ALT:
2615 return TRUE;
2616
2617 /* In UTF-8 mode, STAR, MINSTAR, POSSTAR, QUERY, MINQUERY, POSQUERY, UPTO,
2618 MINUPTO, and POSUPTO and their caseless and negative versions may be
2619 followed by a multibyte character. */
2620
2621 #if defined SUPPORT_UTF && !defined COMPILE_PCRE32
2622 case OP_STAR:
2623 case OP_STARI:
2624 case OP_NOTSTAR:
2625 case OP_NOTSTARI:
2626
2627 case OP_MINSTAR:
2628 case OP_MINSTARI:
2629 case OP_NOTMINSTAR:
2630 case OP_NOTMINSTARI:
2631
2632 case OP_POSSTAR:
2633 case OP_POSSTARI:
2634 case OP_NOTPOSSTAR:
2635 case OP_NOTPOSSTARI:
2636
2637 case OP_QUERY:
2638 case OP_QUERYI:
2639 case OP_NOTQUERY:
2640 case OP_NOTQUERYI:
2641
2642 case OP_MINQUERY:
2643 case OP_MINQUERYI:
2644 case OP_NOTMINQUERY:
2645 case OP_NOTMINQUERYI:
2646
2647 case OP_POSQUERY:
2648 case OP_POSQUERYI:
2649 case OP_NOTPOSQUERY:
2650 case OP_NOTPOSQUERYI:
2651
2652 if (utf && HAS_EXTRALEN(code[1])) code += GET_EXTRALEN(code[1]);
2653 break;
2654
2655 case OP_UPTO:
2656 case OP_UPTOI:
2657 case OP_NOTUPTO:
2658 case OP_NOTUPTOI:
2659
2660 case OP_MINUPTO:
2661 case OP_MINUPTOI:
2662 case OP_NOTMINUPTO:
2663 case OP_NOTMINUPTOI:
2664
2665 case OP_POSUPTO:
2666 case OP_POSUPTOI:
2667 case OP_NOTPOSUPTO:
2668 case OP_NOTPOSUPTOI:
2669
2670 if (utf && HAS_EXTRALEN(code[1 + IMM2_SIZE])) code += GET_EXTRALEN(code[1 + IMM2_SIZE]);
2671 break;
2672 #endif
2673
2674 /* MARK, and PRUNE/SKIP/THEN with an argument must skip over the argument
2675 string. */
2676
2677 case OP_MARK:
2678 case OP_PRUNE_ARG:
2679 case OP_SKIP_ARG:
2680 case OP_THEN_ARG:
2681 code += code[1];
2682 break;
2683
2684 /* None of the remaining opcodes are required to match a character. */
2685
2686 default:
2687 break;
2688 }
2689 }
2690
2691 return TRUE;
2692 }
2693
2694
2695
2696 /*************************************************
2697 * Scan compiled regex for non-emptiness *
2698 *************************************************/
2699
2700 /* This function is called to check for left recursive calls. We want to check
2701 the current branch of the current pattern to see if it could match the empty
2702 string. If it could, we must look outwards for branches at other levels,
2703 stopping when we pass beyond the bracket which is the subject of the recursion.
2704 This function is called only during the real compile, not during the
2705 pre-compile.
2706
2707 Arguments:
2708 code points to start of the recursion
2709 endcode points to where to stop (current RECURSE item)
2710 bcptr points to the chain of current (unclosed) branch starts
2711 utf TRUE if in UTF-8 / UTF-16 / UTF-32 mode
2712 cd pointers to tables etc
2713
2714 Returns: TRUE if what is matched could be empty
2715 */
2716
2717 static BOOL
2718 could_be_empty(const pcre_uchar *code, const pcre_uchar *endcode,
2719 branch_chain *bcptr, BOOL utf, compile_data *cd)
2720 {
2721 while (bcptr != NULL && bcptr->current_branch >= code)
2722 {
2723 if (!could_be_empty_branch(bcptr->current_branch, endcode, utf, cd, NULL))
2724 return FALSE;
2725 bcptr = bcptr->outer;
2726 }
2727 return TRUE;
2728 }
2729
2730
2731
2732 /*************************************************
2733 * Base opcode of repeated opcodes *
2734 *************************************************/
2735
2736 /* Returns the base opcode for repeated single character type opcodes. If the
2737 opcode is not a repeated character type, it returns with the original value.
2738
2739 Arguments: c opcode
2740 Returns: base opcode for the type
2741 */
2742
2743 static pcre_uchar
2744 get_repeat_base(pcre_uchar c)
2745 {
2746 return (c > OP_TYPEPOSUPTO)? c :
2747 (c >= OP_TYPESTAR)? OP_TYPESTAR :
2748 (c >= OP_NOTSTARI)? OP_NOTSTARI :
2749 (c >= OP_NOTSTAR)? OP_NOTSTAR :
2750 (c >= OP_STARI)? OP_STARI :
2751 OP_STAR;
2752 }
2753
2754
2755
2756 #ifdef SUPPORT_UCP
2757 /*************************************************
2758 * Check a character and a property *
2759 *************************************************/
2760
2761 /* This function is called by check_auto_possessive() when a property item
2762 is adjacent to a fixed character.
2763
2764 Arguments:
2765 c the character
2766 ptype the property type
2767 pdata the data for the type
2768 negated TRUE if it's a negated property (\P or \p{^)
2769
2770 Returns: TRUE if auto-possessifying is OK
2771 */
2772
2773 static BOOL
2774 check_char_prop(pcre_uint32 c, unsigned int ptype, unsigned int pdata,
2775 BOOL negated)
2776 {
2777 const pcre_uint32 *p;
2778 const ucd_record *prop = GET_UCD(c);
2779
2780 switch(ptype)
2781 {
2782 case PT_LAMP:
2783 return (prop->chartype == ucp_Lu ||
2784 prop->chartype == ucp_Ll ||
2785 prop->chartype == ucp_Lt) == negated;
2786
2787 case PT_GC:
2788 return (pdata == PRIV(ucp_gentype)[prop->chartype]) == negated;
2789
2790 case PT_PC:
2791 return (pdata == prop->chartype) == negated;
2792
2793 case PT_SC:
2794 return (pdata == prop->script) == negated;
2795
2796 /* These are specials */
2797
2798 case PT_ALNUM:
2799 return (PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
2800 PRIV(ucp_gentype)[prop->chartype] == ucp_N) == negated;
2801
2802 /* Perl space used to exclude VT, but from Perl 5.18 it is included, which
2803 means that Perl space and POSIX space are now identical. PCRE was changed
2804 at release 8.34. */
2805
2806 case PT_SPACE: /* Perl space */
2807 case PT_PXSPACE: /* POSIX space */
2808 switch(c)
2809 {
2810 HSPACE_CASES:
2811 VSPACE_CASES:
2812 return negated;
2813
2814 default:
2815 return (PRIV(ucp_gentype)[prop->chartype] == ucp_Z) == negated;
2816 }
2817 break; /* Control never reaches here */
2818
2819 case PT_WORD:
2820 return (PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
2821 PRIV(ucp_gentype)[prop->chartype] == ucp_N ||
2822 c == CHAR_UNDERSCORE) == negated;
2823
2824 case PT_CLIST:
2825 p = PRIV(ucd_caseless_sets) + prop->caseset;
2826 for (;;)
2827 {
2828 if (c < *p) return !negated;
2829 if (c == *p++) return negated;
2830 }
2831 break; /* Control never reaches here */
2832 }
2833
2834 return FALSE;
2835 }
2836 #endif /* SUPPORT_UCP */
2837
2838
2839
2840 /*************************************************
2841 * Fill the character property list *
2842 *************************************************/
2843
2844 /* Checks whether the code points to an opcode that can take part in auto-
2845 possessification, and if so, fills a list with its properties.
2846
2847 Arguments:
2848 code points to start of expression
2849 utf TRUE if in UTF-8 / UTF-16 / UTF-32 mode
2850 fcc points to case-flipping table
2851 list points to output list
2852 list[0] will be filled with the opcode
2853 list[1] will be non-zero if this opcode
2854 can match an empty character string
2855 list[2..7] depends on the opcode
2856
2857 Returns: points to the start of the next opcode if *code is accepted
2858 NULL if *code is not accepted
2859 */
2860
2861 static const pcre_uchar *
2862 get_chr_property_list(const pcre_uchar *code, BOOL utf,
2863 const pcre_uint8 *fcc, pcre_uint32 *list)
2864 {
2865 pcre_uchar c = *code;
2866 pcre_uchar base;
2867 const pcre_uchar *end;
2868 pcre_uint32 chr;
2869
2870 #ifdef SUPPORT_UCP
2871 pcre_uint32 *clist_dest;
2872 const pcre_uint32 *clist_src;
2873 #else
2874 utf = utf; /* Suppress "unused parameter" compiler warning */
2875 #endif
2876
2877 list[0] = c;
2878 list[1] = FALSE;
2879 code++;
2880
2881 if (c >= OP_STAR && c <= OP_TYPEPOSUPTO)
2882 {
2883 base = get_repeat_base(c);
2884 c -= (base - OP_STAR);
2885
2886 if (c == OP_UPTO || c == OP_MINUPTO || c == OP_EXACT || c == OP_POSUPTO)
2887 code += IMM2_SIZE;
2888
2889 list[1] = (c != OP_PLUS && c != OP_MINPLUS && c != OP_EXACT && c != OP_POSPLUS);
2890
2891 switch(base)
2892 {
2893 case OP_STAR:
2894 list[0] = OP_CHAR;
2895 break;
2896
2897 case OP_STARI:
2898 list[0] = OP_CHARI;
2899 break;
2900
2901 case OP_NOTSTAR:
2902 list[0] = OP_NOT;
2903 break;
2904
2905 case OP_NOTSTARI:
2906 list[0] = OP_NOTI;
2907 break;
2908
2909 case OP_TYPESTAR:
2910 list[0] = *code;
2911 code++;
2912 break;
2913 }
2914 c = list[0];
2915 }
2916
2917 switch(c)
2918 {
2919 case OP_NOT_DIGIT:
2920 case OP_DIGIT:
2921 case OP_NOT_WHITESPACE:
2922 case OP_WHITESPACE:
2923 case OP_NOT_WORDCHAR:
2924 case OP_WORDCHAR:
2925 case OP_ANY:
2926 case OP_ALLANY:
2927 case OP_ANYNL:
2928 case OP_NOT_HSPACE:
2929 case OP_HSPACE:
2930 case OP_NOT_VSPACE:
2931 case OP_VSPACE:
2932 case OP_EXTUNI:
2933 case OP_EODN:
2934 case OP_EOD:
2935 case OP_DOLL:
2936 case OP_DOLLM:
2937 return code;
2938
2939 case OP_CHAR:
2940 case OP_NOT:
2941 GETCHARINCTEST(chr, code);
2942 list[2] = chr;
2943 list[3] = NOTACHAR;
2944 return code;
2945
2946 case OP_CHARI:
2947 case OP_NOTI:
2948 list[0] = (c == OP_CHARI) ? OP_CHAR : OP_NOT;
2949 GETCHARINCTEST(chr, code);
2950 list[2] = chr;
2951
2952 #ifdef SUPPORT_UCP
2953 if (chr < 128 || (chr < 256 && !utf))
2954 list[3] = fcc[chr];
2955 else
2956 list[3] = UCD_OTHERCASE(chr);
2957 #elif defined SUPPORT_UTF || !defined COMPILE_PCRE8
2958 list[3] = (chr < 256) ? fcc[chr] : chr;
2959 #else
2960 list[3] = fcc[chr];
2961 #endif
2962
2963 /* The othercase might be the same value. */
2964
2965 if (chr == list[3])
2966 list[3] = NOTACHAR;
2967 else
2968 list[4] = NOTACHAR;
2969 return code;
2970
2971 #ifdef SUPPORT_UCP
2972 case OP_PROP:
2973 case OP_NOTPROP:
2974 if (code[0] != PT_CLIST)
2975 {
2976 list[2] = code[0];
2977 list[3] = code[1];
2978 return code + 2;
2979 }
2980
2981 /* Convert only if we have enough space. */
2982
2983 clist_src = PRIV(ucd_caseless_sets) + code[1];
2984 clist_dest = list + 2;
2985 code += 2;
2986
2987 do {
2988 if (clist_dest >= list + 8)
2989 {
2990 /* Early return if there is not enough space. This should never
2991 happen, since all clists are shorter than 5 character now. */
2992 list[2] = code[0];
2993 list[3] = code[1];
2994 return code;
2995 }
2996 *clist_dest++ = *clist_src;
2997 }
2998 while(*clist_src++ != NOTACHAR);
2999
3000 /* All characters are stored. The terminating NOTACHAR
3001 is copied form the clist itself. */
3002
3003 list[0] = (c == OP_PROP) ? OP_CHAR : OP_NOT;
3004 return code;
3005 #endif
3006
3007 case OP_NCLASS:
3008 case OP_CLASS:
3009 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
3010 case OP_XCLASS:
3011 if (c == OP_XCLASS)
3012 end = code + GET(code, 0) - 1;
3013 else
3014 #endif
3015 end = code + 32 / sizeof(pcre_uchar);
3016
3017 switch(*end)
3018 {
3019 case OP_CRSTAR:
3020 case OP_CRMINSTAR:
3021 case OP_CRQUERY:
3022 case OP_CRMINQUERY:
3023 case OP_CRPOSSTAR:
3024 case OP_CRPOSQUERY:
3025 list[1] = TRUE;
3026 end++;
3027 break;
3028
3029 case OP_CRPLUS:
3030 case OP_CRMINPLUS:
3031 case OP_CRPOSPLUS:
3032 end++;
3033 break;
3034
3035 case OP_CRRANGE:
3036 case OP_CRMINRANGE:
3037 case OP_CRPOSRANGE:
3038 list[1] = (GET2(end, 1) == 0);
3039 end += 1 + 2 * IMM2_SIZE;
3040 break;
3041 }
3042 list[2] = (pcre_uint32)(end - code);
3043 return end;
3044 }
3045 return NULL; /* Opcode not accepted */
3046 }
3047
3048
3049
3050 /*************************************************
3051 * Scan further character sets for match *
3052 *************************************************/
3053
3054 /* Checks whether the base and the current opcode have a common character, in
3055 which case the base cannot be possessified.
3056
3057 Arguments:
3058 code points to the byte code
3059 utf TRUE in UTF-8 / UTF-16 / UTF-32 mode
3060 cd static compile data
3061 base_list the data list of the base opcode
3062
3063 Returns: TRUE if the auto-possessification is possible
3064 */
3065
3066 static BOOL
3067 compare_opcodes(const pcre_uchar *code, BOOL utf, const compile_data *cd,
3068 const pcre_uint32 *base_list, const pcre_uchar *base_end)
3069 {
3070 pcre_uchar c;
3071 pcre_uint32 list[8];
3072 const pcre_uint32 *chr_ptr;
3073 const pcre_uint32 *ochr_ptr;
3074 const pcre_uint32 *list_ptr;
3075 const pcre_uchar *next_code;
3076 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
3077 const pcre_uchar *xclass_flags;
3078 #endif
3079 const pcre_uint8 *class_bitset;
3080 const pcre_uint8 *set1, *set2, *set_end;
3081 pcre_uint32 chr;
3082 BOOL accepted, invert_bits;
3083 BOOL entered_a_group = FALSE;
3084
3085 /* Note: the base_list[1] contains whether the current opcode has greedy
3086 (represented by a non-zero value) quantifier. This is a different from
3087 other character type lists, which stores here that the character iterator
3088 matches to an empty string (also represented by a non-zero value). */
3089
3090 for(;;)
3091 {
3092 /* All operations move the code pointer forward.
3093 Therefore infinite recursions are not possible. */
3094
3095 c = *code;
3096
3097 /* Skip over callouts */
3098
3099 if (c == OP_CALLOUT)
3100 {
3101 code += PRIV(OP_lengths)[c];
3102 continue;
3103 }
3104
3105 if (c == OP_ALT)
3106 {
3107 do code += GET(code, 1); while (*code == OP_ALT);
3108 c = *code;
3109 }
3110
3111 switch(c)
3112 {
3113 case OP_END:
3114 case OP_KETRPOS:
3115 /* TRUE only in greedy case. The non-greedy case could be replaced by
3116 an OP_EXACT, but it is probably not worth it. (And note that OP_EXACT
3117 uses more memory, which we cannot get at this stage.) */
3118
3119 return base_list[1] != 0;
3120
3121 case OP_KET:
3122 /* If the bracket is capturing, and referenced by an OP_RECURSE, or
3123 it is an atomic sub-pattern (assert, once, etc.) the non-greedy case
3124 cannot be converted to a possessive form. */
3125
3126 if (base_list[1] == 0) return FALSE;
3127
3128 switch(*(code - GET(code, 1)))
3129 {
3130 case OP_ASSERT:
3131 case OP_ASSERT_NOT:
3132 case OP_ASSERTBACK:
3133 case OP_ASSERTBACK_NOT:
3134 case OP_ONCE:
3135 case OP_ONCE_NC:
3136 /* Atomic sub-patterns and assertions can always auto-possessify their
3137 last iterator. However, if the group was entered as a result of checking
3138 a previous iterator, this is not possible. */
3139
3140 return !entered_a_group;
3141 }
3142
3143 code += PRIV(OP_lengths)[c];
3144 continue;
3145
3146 case OP_ONCE:
3147 case OP_ONCE_NC:
3148 case OP_BRA:
3149 case OP_CBRA:
3150 next_code = code + GET(code, 1);
3151 code += PRIV(OP_lengths)[c];
3152
3153 while (*next_code == OP_ALT)
3154 {
3155 if (!compare_opcodes(code, utf, cd, base_list, base_end)) return FALSE;
3156 code = next_code + 1 + LINK_SIZE;
3157 next_code += GET(next_code, 1);
3158 }
3159
3160 entered_a_group = TRUE;
3161 continue;
3162
3163 case OP_BRAZERO:
3164 case OP_BRAMINZERO:
3165
3166 next_code = code + 1;
3167 if (*next_code != OP_BRA && *next_code != OP_CBRA
3168 && *next_code != OP_ONCE && *next_code != OP_ONCE_NC) return FALSE;
3169
3170 do next_code += GET(next_code, 1); while (*next_code == OP_ALT);
3171
3172 /* The bracket content will be checked by the
3173 OP_BRA/OP_CBRA case above. */
3174 next_code += 1 + LINK_SIZE;
3175 if (!compare_opcodes(next_code, utf, cd, base_list, base_end))
3176 return FALSE;
3177
3178 code += PRIV(OP_lengths)[c];
3179 continue;
3180
3181 default:
3182 break;
3183 }
3184
3185 /* Check for a supported opcode, and load its properties. */
3186
3187 code = get_chr_property_list(code, utf, cd->fcc, list);
3188 if (code == NULL) return FALSE; /* Unsupported */
3189
3190 /* If either opcode is a small character list, set pointers for comparing
3191 characters from that list with another list, or with a property. */
3192
3193 if (base_list[0] == OP_CHAR)
3194 {
3195 chr_ptr = base_list + 2;
3196 list_ptr = list;
3197 }
3198 else if (list[0] == OP_CHAR)
3199 {
3200 chr_ptr = list + 2;
3201 list_ptr = base_list;
3202 }
3203
3204 /* Character bitsets can also be compared to certain opcodes. */
3205
3206 else if (base_list[0] == OP_CLASS || list[0] == OP_CLASS
3207 #ifdef COMPILE_PCRE8
3208 /* In 8 bit, non-UTF mode, OP_CLASS and OP_NCLASS are the same. */
3209 || (!utf && (base_list[0] == OP_NCLASS || list[0] == OP_NCLASS))
3210 #endif
3211 )
3212 {
3213 #ifdef COMPILE_PCRE8
3214 if (base_list[0] == OP_CLASS || (!utf && base_list[0] == OP_NCLASS))
3215 #else
3216 if (base_list[0] == OP_CLASS)
3217 #endif
3218 {
3219 set1 = (pcre_uint8 *)(base_end - base_list[2]);
3220 list_ptr = list;
3221 }
3222 else
3223 {
3224 set1 = (pcre_uint8 *)(code - list[2]);
3225 list_ptr = base_list;
3226 }
3227
3228 invert_bits = FALSE;
3229 switch(list_ptr[0])
3230 {
3231 case OP_CLASS:
3232 case OP_NCLASS:
3233 set2 = (pcre_uint8 *)
3234 ((list_ptr == list ? code : base_end) - list_ptr[2]);
3235 break;
3236
3237 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
3238 case OP_XCLASS:
3239 xclass_flags = (list_ptr == list ? code : base_end) - list_ptr[2] + LINK_SIZE;
3240 if ((*xclass_flags & XCL_HASPROP) != 0) return FALSE;
3241 if ((*xclass_flags & XCL_MAP) == 0)
3242 {
3243 /* No bits are set for characters < 256. */
3244 if (list[1] == 0) return TRUE;
3245 /* Might be an empty repeat. */
3246 continue;
3247 }
3248 set2 = (pcre_uint8 *)(xclass_flags + 1);
3249 break;
3250 #endif
3251
3252 case OP_NOT_DIGIT:
3253 invert_bits = TRUE;
3254 /* Fall through */
3255 case OP_DIGIT:
3256 set2 = (pcre_uint8 *)(cd->cbits + cbit_digit);
3257 break;
3258
3259 case OP_NOT_WHITESPACE:
3260 invert_bits = TRUE;
3261 /* Fall through */
3262 case OP_WHITESPACE:
3263 set2 = (pcre_uint8 *)(cd->cbits + cbit_space);
3264 break;
3265
3266 case OP_NOT_WORDCHAR:
3267 invert_bits = TRUE;
3268 /* Fall through */
3269 case OP_WORDCHAR:
3270 set2 = (pcre_uint8 *)(cd->cbits + cbit_word);
3271 break;
3272
3273 default:
3274 return FALSE;
3275 }
3276
3277 /* Because the sets are unaligned, we need
3278 to perform byte comparison here. */
3279 set_end = set1 + 32;
3280 if (invert_bits)
3281 {
3282 do
3283 {
3284 if ((*set1++ & ~(*set2++)) != 0) return FALSE;
3285 }
3286 while (set1 < set_end);
3287 }
3288 else
3289 {
3290 do
3291 {
3292 if ((*set1++ & *set2++) != 0) return FALSE;
3293 }
3294 while (set1 < set_end);
3295 }
3296
3297 if (list[1] == 0) return TRUE;
3298 /* Might be an empty repeat. */
3299 continue;
3300 }
3301
3302 /* Some property combinations also acceptable. Unicode property opcodes are
3303 processed specially; the rest can be handled with a lookup table. */
3304
3305 else
3306 {
3307 pcre_uint32 leftop, rightop;
3308
3309 leftop = base_list[0];
3310 rightop = list[0];
3311
3312 #ifdef SUPPORT_UCP
3313 accepted = FALSE; /* Always set in non-unicode case. */
3314 if (leftop == OP_PROP || leftop == OP_NOTPROP)
3315 {
3316 if (rightop == OP_EOD)
3317 accepted = TRUE;
3318 else if (rightop == OP_PROP || rightop == OP_NOTPROP)
3319 {
3320 int n;
3321 const pcre_uint8 *p;
3322 BOOL same = leftop == rightop;
3323 BOOL lisprop = leftop == OP_PROP;
3324 BOOL risprop = rightop == OP_PROP;
3325 BOOL bothprop = lisprop && risprop;
3326
3327 /* There's a table that specifies how each combination is to be
3328 processed:
3329 0 Always return FALSE (never auto-possessify)
3330 1 Character groups are distinct (possessify if both are OP_PROP)
3331 2 Check character categories in the same group (general or particular)
3332 3 Return TRUE if the two opcodes are not the same
3333 ... see comments below
3334 */
3335
3336 n = propposstab[base_list[2]][list[2]];
3337 switch(n)
3338 {
3339 case 0: break;
3340 case 1: accepted = bothprop; break;
3341 case 2: accepted = (base_list[3] == list[3]) != same; break;
3342 case 3: accepted = !same; break;
3343
3344 case 4: /* Left general category, right particular category */
3345 accepted = risprop && catposstab[base_list[3]][list[3]] == same;
3346 break;
3347
3348 case 5: /* Right general category, left particular category */
3349 accepted = lisprop && catposstab[list[3]][base_list[3]] == same;
3350 break;
3351
3352 /* This code is logically tricky. Think hard before fiddling with it.
3353 The posspropstab table has four entries per row. Each row relates to
3354 one of PCRE's special properties such as ALNUM or SPACE or WORD.
3355 Only WORD actually needs all four entries, but using repeats for the
3356 others means they can all use the same code below.
3357
3358 The first two entries in each row are Unicode general categories, and
3359 apply always, because all the characters they include are part of the
3360 PCRE character set. The third and fourth entries are a general and a
3361 particular category, respectively, that include one or more relevant
3362 characters. One or the other is used, depending on whether the check
3363 is for a general or a particular category. However, in both cases the
3364 category contains more characters than the specials that are defined
3365 for the property being tested against. Therefore, it cannot be used
3366 in a NOTPROP case.
3367
3368 Example: the row for WORD contains ucp_L, ucp_N, ucp_P, ucp_Po.
3369 Underscore is covered by ucp_P or ucp_Po. */
3370
3371 case 6: /* Left alphanum vs right general category */
3372 case 7: /* Left space vs right general category */
3373 case 8: /* Left word vs right general category */
3374 p = posspropstab[n-6];
3375 accepted = risprop && lisprop ==
3376 (list[3] != p[0] &&
3377 list[3] != p[1] &&
3378 (list[3] != p[2] || !lisprop));
3379 break;
3380
3381 case 9: /* Right alphanum vs left general category */
3382 case 10: /* Right space vs left general category */
3383 case 11: /* Right word vs left general category */
3384 p = posspropstab[n-9];
3385 accepted = lisprop && risprop ==
3386 (base_list[3] != p[0] &&
3387 base_list[3] != p[1] &&
3388 (base_list[3] != p[2] || !risprop));
3389 break;
3390
3391 case 12: /* Left alphanum vs right particular category */
3392 case 13: /* Left space vs right particular category */
3393 case 14: /* Left word vs right particular category */
3394 p = posspropstab[n-12];
3395 accepted = risprop && lisprop ==
3396 (catposstab[p[0]][list[3]] &&
3397 catposstab[p[1]][list[3]] &&
3398 (list[3] != p[3] || !lisprop));
3399 break;
3400
3401 case 15: /* Right alphanum vs left particular category */
3402 case 16: /* Right space vs left particular category */
3403 case 17: /* Right word vs left particular category */
3404 p = posspropstab[n-15];
3405 accepted = lisprop && risprop ==
3406 (catposstab[p[0]][base_list[3]] &&
3407 catposstab[p[1]][base_list[3]] &&
3408 (base_list[3] != p[3] || !risprop));
3409 break;
3410 }
3411 }
3412 }
3413
3414 else
3415 #endif /* SUPPORT_UCP */
3416
3417 accepted = leftop >= FIRST_AUTOTAB_OP && leftop <= LAST_AUTOTAB_LEFT_OP &&
3418 rightop >= FIRST_AUTOTAB_OP && rightop <= LAST_AUTOTAB_RIGHT_OP &&
3419 autoposstab[leftop - FIRST_AUTOTAB_OP][rightop - FIRST_AUTOTAB_OP];
3420
3421 if (!accepted) return FALSE;
3422
3423 if (list[1] == 0) return TRUE;
3424 /* Might be an empty repeat. */
3425 continue;
3426 }
3427
3428 /* Control reaches here only if one of the items is a small character list.
3429 All characters are checked against the other side. */
3430
3431 do
3432 {
3433 chr = *chr_ptr;
3434
3435 switch(list_ptr[0])
3436 {
3437 case OP_CHAR:
3438 ochr_ptr = list_ptr + 2;
3439 do
3440 {
3441 if (chr == *ochr_ptr) return FALSE;
3442 ochr_ptr++;
3443 }
3444 while(*ochr_ptr != NOTACHAR);
3445 break;
3446
3447 case OP_NOT:
3448 ochr_ptr = list_ptr + 2;
3449 do
3450 {
3451 if (chr == *ochr_ptr)
3452 break;
3453 ochr_ptr++;
3454 }
3455 while(*ochr_ptr != NOTACHAR);
3456 if (*ochr_ptr == NOTACHAR) return FALSE; /* Not found */
3457 break;
3458
3459 /* Note that OP_DIGIT etc. are generated only when PCRE_UCP is *not*
3460 set. When it is set, \d etc. are converted into OP_(NOT_)PROP codes. */
3461
3462 case OP_DIGIT:
3463 if (chr < 256 && (cd->ctypes[chr] & ctype_digit) != 0) return FALSE;
3464 break;
3465
3466 case OP_NOT_DIGIT:
3467 if (chr > 255 || (cd->ctypes[chr] & ctype_digit) == 0) return FALSE;
3468 break;
3469
3470 case OP_WHITESPACE:
3471 if (chr < 256 && (cd->ctypes[chr] & ctype_space) != 0) return FALSE;
3472 break;
3473
3474 case OP_NOT_WHITESPACE:
3475 if (chr > 255 || (cd->ctypes[chr] & ctype_space) == 0) return FALSE;
3476 break;
3477
3478 case OP_WORDCHAR:
3479 if (chr < 255 && (cd->ctypes[chr] & ctype_word) != 0) return FALSE;
3480 break;
3481
3482 case OP_NOT_WORDCHAR:
3483 if (chr > 255 || (cd->ctypes[chr] & ctype_word) == 0) return FALSE;
3484 break;
3485
3486 case OP_HSPACE:
3487 switch(chr)
3488 {
3489 HSPACE_CASES: return FALSE;
3490 default: break;
3491 }
3492 break;
3493
3494 case OP_NOT_HSPACE:
3495 switch(chr)
3496 {
3497 HSPACE_CASES: break;
3498 default: return FALSE;
3499 }
3500 break;
3501
3502 case OP_ANYNL:
3503 case OP_VSPACE:
3504 switch(chr)
3505 {
3506 VSPACE_CASES: return FALSE;
3507 default: break;
3508 }
3509 break;
3510
3511 case OP_NOT_VSPACE:
3512 switch(chr)
3513 {
3514 VSPACE_CASES: break;
3515 default: return FALSE;
3516 }
3517 break;
3518
3519 case OP_DOLL:
3520 case OP_EODN:
3521 switch (chr)
3522 {
3523 case CHAR_CR:
3524 case CHAR_LF:
3525 case CHAR_VT:
3526 case CHAR_FF:
3527 case CHAR_NEL:
3528 #ifndef EBCDIC
3529 case 0x2028:
3530 case 0x2029:
3531 #endif /* Not EBCDIC */
3532 return FALSE;
3533 }
3534 break;
3535
3536 case OP_EOD: /* Can always possessify before \z */
3537 break;
3538
3539 #ifdef SUPPORT_UCP
3540 case OP_PROP:
3541 case OP_NOTPROP:
3542 if (!check_char_prop(chr, list_ptr[2], list_ptr[3],
3543 list_ptr[0] == OP_NOTPROP))
3544 return FALSE;
3545 break;
3546 #endif
3547
3548 case OP_NCLASS:
3549 if (chr > 255) return FALSE;
3550 /* Fall through */
3551
3552 case OP_CLASS:
3553 if (chr > 255) break;
3554 class_bitset = (pcre_uint8 *)
3555 ((list_ptr == list ? code : base_end) - list_ptr[2]);
3556 if ((class_bitset[chr >> 3] & (1 << (chr & 7))) != 0) return FALSE;
3557 break;
3558
3559 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
3560 case OP_XCLASS:
3561 if (PRIV(xclass)(chr, (list_ptr == list ? code : base_end) -
3562 list_ptr[2] + LINK_SIZE, utf)) return FALSE;
3563 break;
3564 #endif
3565
3566 default:
3567 return FALSE;
3568 }
3569
3570 chr_ptr++;
3571 }
3572 while(*chr_ptr != NOTACHAR);
3573
3574 /* At least one character must be matched from this opcode. */
3575
3576 if (list[1] == 0) return TRUE;
3577 }
3578
3579 /* Control never reaches here. There used to be a fail-save return FALSE; here,
3580 but some compilers complain about an unreachable statement. */
3581
3582 }
3583
3584
3585
3586 /*************************************************
3587 * Scan compiled regex for auto-possession *
3588 *************************************************/
3589
3590 /* Replaces single character iterations with their possessive alternatives
3591 if appropriate. This function modifies the compiled opcode!
3592
3593 Arguments:
3594 code points to start of the byte code
3595 utf TRUE in UTF-8 / UTF-16 / UTF-32 mode
3596 cd static compile data
3597
3598 Returns: nothing
3599 */
3600
3601 static void
3602 auto_possessify(pcre_uchar *code, BOOL utf, const compile_data *cd)
3603 {
3604 register pcre_uchar c;
3605 const pcre_uchar *end;
3606 pcre_uchar *repeat_opcode;
3607 pcre_uint32 list[8];
3608
3609 for (;;)
3610 {
3611 c = *code;
3612
3613 /* When a pattern with bad UTF-8 encoding is compiled with NO_UTF_CHECK,
3614 it may compile without complaining, but may get into a loop here if the code
3615 pointer points to a bad value. This is, of course a documentated possibility,
3616 when NO_UTF_CHECK is set, so it isn't a bug, but we can detect this case and
3617 just give up on this optimization. */
3618
3619 if (c >= OP_TABLE_LENGTH) return;
3620
3621 if (c >= OP_STAR && c <= OP_TYPEPOSUPTO)
3622 {
3623 c -= get_repeat_base(c) - OP_STAR;
3624 end = (c <= OP_MINUPTO) ?
3625 get_chr_property_list(code, utf, cd->fcc, list) : NULL;
3626 list[1] = c == OP_STAR || c == OP_PLUS || c == OP_QUERY || c == OP_UPTO;
3627
3628 if (end != NULL && compare_opcodes(end, utf, cd, list, end))
3629 {
3630 switch(c)
3631 {
3632 case OP_STAR:
3633 *code += OP_POSSTAR - OP_STAR;
3634 break;
3635
3636 case OP_MINSTAR:
3637 *code += OP_POSSTAR - OP_MINSTAR;
3638 break;
3639
3640 case OP_PLUS:
3641 *code += OP_POSPLUS - OP_PLUS;
3642 break;
3643
3644 case OP_MINPLUS:
3645 *code += OP_POSPLUS - OP_MINPLUS;
3646 break;
3647
3648 case OP_QUERY:
3649 *code += OP_POSQUERY - OP_QUERY;
3650 break;
3651
3652 case OP_MINQUERY:
3653 *code += OP_POSQUERY - OP_MINQUERY;
3654 break;
3655
3656 case OP_UPTO:
3657 *code += OP_POSUPTO - OP_UPTO;
3658 break;
3659
3660 case OP_MINUPTO:
3661 *code += OP_POSUPTO - OP_MINUPTO;
3662 break;
3663 }
3664 }
3665 c = *code;
3666 }
3667 else if (c == OP_CLASS || c == OP_NCLASS || c == OP_XCLASS)
3668 {
3669 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
3670 if (c == OP_XCLASS)
3671 repeat_opcode = code + GET(code, 1);
3672 else
3673 #endif
3674 repeat_opcode = code + 1 + (32 / sizeof(pcre_uchar));
3675
3676 c = *repeat_opcode;
3677 if (c >= OP_CRSTAR && c <= OP_CRMINRANGE)
3678 {
3679 /* end must not be NULL. */
3680 end = get_chr_property_list(code, utf, cd->fcc, list);
3681
3682 list[1] = (c & 1) == 0;
3683
3684 if (compare_opcodes(end, utf, cd, list, end))
3685 {
3686 switch (c)
3687 {
3688 case OP_CRSTAR:
3689 case OP_CRMINSTAR:
3690 *repeat_opcode = OP_CRPOSSTAR;
3691 break;
3692
3693 case OP_CRPLUS:
3694 case OP_CRMINPLUS:
3695 *repeat_opcode = OP_CRPOSPLUS;
3696 break;
3697
3698 case OP_CRQUERY:
3699 case OP_CRMINQUERY:
3700 *repeat_opcode = OP_CRPOSQUERY;
3701 break;
3702
3703 case OP_CRRANGE:
3704 case OP_CRMINRANGE:
3705 *repeat_opcode = OP_CRPOSRANGE;
3706 break;
3707 }
3708 }
3709 }
3710 c = *code;
3711 }
3712
3713 switch(c)
3714 {
3715 case OP_END:
3716 return;
3717
3718 case OP_TYPESTAR:
3719 case OP_TYPEMINSTAR:
3720 case OP_TYPEPLUS:
3721 case OP_TYPEMINPLUS:
3722 case OP_TYPEQUERY:
3723 case OP_TYPEMINQUERY:
3724 case OP_TYPEPOSSTAR:
3725 case OP_TYPEPOSPLUS:
3726 case OP_TYPEPOSQUERY:
3727 if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2;
3728 break;
3729
3730 case OP_TYPEUPTO:
3731 case OP_TYPEMINUPTO:
3732 case OP_TYPEEXACT:
3733 case OP_TYPEPOSUPTO:
3734 if (code[1 + IMM2_SIZE] == OP_PROP || code[1 + IMM2_SIZE] == OP_NOTPROP)
3735 code += 2;
3736 break;
3737
3738 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
3739 case OP_XCLASS:
3740 code += GET(code, 1);
3741 break;
3742 #endif
3743
3744 case OP_MARK:
3745 case OP_PRUNE_ARG:
3746 case OP_SKIP_ARG:
3747 case OP_THEN_ARG:
3748 code += code[1];
3749 break;
3750 }
3751
3752 /* Add in the fixed length from the table */
3753
3754 code += PRIV(OP_lengths)[c];
3755
3756 /* In UTF-8 mode, opcodes that are followed by a character may be followed by
3757 a multi-byte character. The length in the table is a minimum, so we have to
3758 arrange to skip the extra bytes. */
3759
3760 #if defined SUPPORT_UTF && !defined COMPILE_PCRE32
3761 if (utf) switch(c)
3762 {
3763 case OP_CHAR:
3764 case OP_CHARI:
3765 case OP_NOT:
3766 case OP_NOTI:
3767 case OP_STAR:
3768 case OP_MINSTAR:
3769 case OP_PLUS:
3770 case OP_MINPLUS:
3771 case OP_QUERY:
3772 case OP_MINQUERY:
3773 case OP_UPTO:
3774 case OP_MINUPTO:
3775 case OP_EXACT:
3776 case OP_POSSTAR:
3777 case OP_POSPLUS:
3778 case OP_POSQUERY:
3779 case OP_POSUPTO:
3780 case OP_STARI:
3781 case OP_MINSTARI:
3782 case OP_PLUSI:
3783 case OP_MINPLUSI:
3784 case OP_QUERYI:
3785 case OP_MINQUERYI:
3786 case OP_UPTOI:
3787 case OP_MINUPTOI:
3788 case OP_EXACTI:
3789 case OP_POSSTARI:
3790 case OP_POSPLUSI:
3791 case OP_POSQUERYI:
3792 case OP_POSUPTOI:
3793 case OP_NOTSTAR:
3794 case OP_NOTMINSTAR:
3795 case OP_NOTPLUS:
3796 case OP_NOTMINPLUS:
3797 case OP_NOTQUERY:
3798 case OP_NOTMINQUERY:
3799 case OP_NOTUPTO:
3800 case OP_NOTMINUPTO:
3801 case OP_NOTEXACT:
3802 case OP_NOTPOSSTAR:
3803 case OP_NOTPOSPLUS:
3804 case OP_NOTPOSQUERY:
3805 case OP_NOTPOSUPTO:
3806 case OP_NOTSTARI:
3807 case OP_NOTMINSTARI:
3808 case OP_NOTPLUSI:
3809 case OP_NOTMINPLUSI:
3810 case OP_NOTQUERYI:
3811 case OP_NOTMINQUERYI:
3812 case OP_NOTUPTOI:
3813 case OP_NOTMINUPTOI:
3814 case OP_NOTEXACTI:
3815 case OP_NOTPOSSTARI:
3816 case OP_NOTPOSPLUSI:
3817 case OP_NOTPOSQUERYI:
3818 case OP_NOTPOSUPTOI:
3819 if (HAS_EXTRALEN(code[-1])) code += GET_EXTRALEN(code[-1]);
3820 break;
3821 }
3822 #else
3823 (void)(utf); /* Keep compiler happy by referencing function argument */
3824 #endif
3825 }
3826 }
3827
3828
3829
3830 /*************************************************
3831 * Check for POSIX class syntax *
3832 *************************************************/
3833
3834 /* This function is called when the sequence "[:" or "[." or "[=" is
3835 encountered in a character class. It checks whether this is followed by a
3836 sequence of characters terminated by a matching ":]" or ".]" or "=]". If we
3837 reach an unescaped ']' without the special preceding character, return FALSE.
3838
3839 Originally, this function only recognized a sequence of letters between the
3840 terminators, but it seems that Perl recognizes any sequence of characters,
3841 though of course unknown POSIX names are subsequently rejected. Perl gives an
3842 "Unknown POSIX class" error for [:f\oo:] for example, where previously PCRE
3843 didn't consider this to be a POSIX class. Likewise for [:1234:].
3844
3845 The problem in trying to be exactly like Perl is in the handling of escapes. We
3846 have to be sure that [abc[:x\]pqr] is *not* treated as containing a POSIX
3847 class, but [abc[:x\]pqr:]] is (so that an error can be generated). The code
3848 below handles the special case of \], but does not try to do any other escape
3849 processing. This makes it different from Perl for cases such as [:l\ower:]
3850 where Perl recognizes it as the POSIX class "lower" but PCRE does not recognize
3851 "l\ower". This is a lesser evil than not diagnosing bad classes when Perl does,
3852 I think.
3853
3854 A user pointed out that PCRE was rejecting [:a[:digit:]] whereas Perl was not.
3855 It seems that the appearance of a nested POSIX class supersedes an apparent
3856 external class. For example, [:a[:digit:]b:] matches "a", "b", ":", or
3857 a digit.
3858
3859 In Perl, unescaped square brackets may also appear as part of class names. For
3860 example, [:a[:abc]b:] gives unknown POSIX class "[:abc]b:]". However, for
3861 [:a[:abc]b][b:] it gives unknown POSIX class "[:abc]b][b:]", which does not
3862 seem right at all. PCRE does not allow closing square brackets in POSIX class
3863 names.
3864
3865 Arguments:
3866 ptr pointer to the initial [
3867 endptr where to return the end pointer
3868
3869 Returns: TRUE or FALSE
3870 */
3871
3872 static BOOL
3873 check_posix_syntax(const pcre_uchar *ptr, const pcre_uchar **endptr)
3874 {
3875 pcre_uchar terminator; /* Don't combine these lines; the Solaris cc */
3876 terminator = *(++ptr); /* compiler warns about "non-constant" initializer. */
3877 for (++ptr; *ptr != CHAR_NULL; ptr++)
3878 {
3879 if (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
3880 ptr++;
3881 else if (*ptr == CHAR_RIGHT_SQUARE_BRACKET) return FALSE;
3882 else
3883 {
3884 if (*ptr == terminator && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
3885 {
3886 *endptr = ptr;
3887 return TRUE;
3888 }
3889 if (*ptr == CHAR_LEFT_SQUARE_BRACKET &&
3890 (ptr[1] == CHAR_COLON || ptr[1] == CHAR_DOT ||
3891 ptr[1] == CHAR_EQUALS_SIGN) &&
3892 check_posix_syntax(ptr, endptr))
3893 return FALSE;
3894 }
3895 }
3896 return FALSE;
3897 }
3898
3899
3900
3901
3902 /*************************************************
3903 * Check POSIX class name *
3904 *************************************************/
3905
3906 /* This function is called to check the name given in a POSIX-style class entry
3907 such as [:alnum:].
3908
3909 Arguments:
3910 ptr points to the first letter
3911 len the length of the name
3912
3913 Returns: a value representing the name, or -1 if unknown
3914 */
3915
3916 static int
3917 check_posix_name(const pcre_uchar *ptr, int len)
3918 {
3919 const char *pn = posix_names;
3920 register int yield = 0;
3921 while (posix_name_lengths[yield] != 0)
3922 {
3923 if (len == posix_name_lengths[yield] &&
3924 STRNCMP_UC_C8(ptr, pn, (unsigned int)len) == 0) return yield;
3925 pn += posix_name_lengths[yield] + 1;
3926 yield++;
3927 }
3928 return -1;
3929 }
3930
3931
3932 /*************************************************
3933 * Adjust OP_RECURSE items in repeated group *
3934 *************************************************/
3935
3936 /* OP_RECURSE items contain an offset from the start of the regex to the group
3937 that is referenced. This means that groups can be replicated for fixed
3938 repetition simply by copying (because the recursion is allowed to refer to
3939 earlier groups that are outside the current group). However, when a group is
3940 optional (i.e. the minimum quantifier is zero), OP_BRAZERO or OP_SKIPZERO is
3941 inserted before it, after it has been compiled. This means that any OP_RECURSE
3942 items within it that refer to the group itself or any contained groups have to
3943 have their offsets adjusted. That one of the jobs of this function. Before it
3944 is called, the partially compiled regex must be temporarily terminated with
3945 OP_END.
3946
3947 This function has been extended with the possibility of forward references for
3948 recursions and subroutine calls. It must also check the list of such references
3949 for the group we are dealing with. If it finds that one of the recursions in
3950 the current group is on this list, it adjusts the offset in the list, not the
3951 value in the reference (which is a group number).
3952
3953 Arguments:
3954 group points to the start of the group
3955 adjust the amount by which the group is to be moved
3956 utf TRUE in UTF-8 / UTF-16 / UTF-32 mode
3957 cd contains pointers to tables etc.
3958 save_hwm the hwm forward reference pointer at the start of the group
3959
3960 Returns: nothing
3961 */
3962
3963 static void
3964 adjust_recurse(pcre_uchar *group, int adjust, BOOL utf, compile_data *cd,
3965 pcre_uchar *save_hwm)
3966 {
3967 pcre_uchar *ptr = group;
3968
3969 while ((ptr = (pcre_uchar *)find_recurse(ptr, utf)) != NULL)
3970 {
3971 int offset;
3972 pcre_uchar *hc;
3973
3974 /* See if this recursion is on the forward reference list. If so, adjust the
3975 reference. */
3976
3977 for (hc = save_hwm; hc < cd->hwm; hc += LINK_SIZE)
3978 {
3979 offset = (int)GET(hc, 0);
3980 if (cd->start_code + offset == ptr + 1)
3981 {
3982 PUT(hc, 0, offset + adjust);
3983 break;
3984 }
3985 }
3986
3987 /* Otherwise, adjust the recursion offset if it's after the start of this
3988 group. */
3989
3990 if (hc >= cd->hwm)
3991 {
3992 offset = (int)GET(ptr, 1);
3993 if (cd->start_code + offset >= group) PUT(ptr, 1, offset + adjust);
3994 }
3995
3996 ptr += 1 + LINK_SIZE;
3997 }
3998 }
3999
4000
4001
4002 /*************************************************
4003 * Insert an automatic callout point *
4004 *************************************************/
4005
4006 /* This function is called when the PCRE_AUTO_CALLOUT option is set, to insert
4007 callout points before each pattern item.
4008
4009 Arguments:
4010 code current code pointer
4011 ptr current pattern pointer
4012 cd pointers to tables etc
4013
4014 Returns: new code pointer
4015 */
4016
4017 static pcre_uchar *
4018 auto_callout(pcre_uchar *code, const pcre_uchar *ptr, compile_data *cd)
4019 {
4020 *code++ = OP_CALLOUT;
4021 *code++ = 255;
4022 PUT(code, 0, (int)(ptr - cd->start_pattern)); /* Pattern offset */
4023 PUT(code, LINK_SIZE, 0); /* Default length */
4024 return code + 2 * LINK_SIZE;
4025 }
4026
4027
4028
4029 /*************************************************
4030 * Complete a callout item *
4031 *************************************************/
4032
4033 /* A callout item contains the length of the next item in the pattern, which
4034 we can't fill in till after we have reached the relevant point. This is used
4035 for both automatic and manual callouts.
4036
4037 Arguments:
4038 previous_callout points to previous callout item
4039 ptr current pattern pointer
4040 cd pointers to tables etc
4041
4042 Returns: nothing
4043 */
4044
4045 static void
4046 complete_callout(pcre_uchar *previous_callout, const pcre_uchar *ptr, compile_data *cd)
4047 {
4048 int length = (int)(ptr - cd->start_pattern - GET(previous_callout, 2));
4049 PUT(previous_callout, 2 + LINK_SIZE, length);
4050 }
4051
4052
4053
4054 #ifdef SUPPORT_UCP
4055 /*************************************************
4056 * Get othercase range *
4057 *************************************************/
4058
4059 /* This function is passed the start and end of a class range, in UTF-8 mode
4060 with UCP support. It searches up the characters, looking for ranges of
4061 characters in the "other" case. Each call returns the next one, updating the
4062 start address. A character with multiple other cases is returned on its own
4063 with a special return value.
4064
4065 Arguments:
4066 cptr points to starting character value; updated
4067 d end value
4068 ocptr where to put start of othercase range
4069 odptr where to put end of othercase range
4070
4071 Yield: -1 when no more
4072 0 when a range is returned
4073 >0 the CASESET offset for char with multiple other cases
4074 in this case, ocptr contains the original
4075 */
4076
4077 static int
4078 get_othercase_range(pcre_uint32 *cptr, pcre_uint32 d, pcre_uint32 *ocptr,
4079 pcre_uint32 *odptr)
4080 {
4081 pcre_uint32 c, othercase, next;
4082 unsigned int co;
4083
4084 /* Find the first character that has an other case. If it has multiple other
4085 cases, return its case offset value. */
4086
4087 for (c = *cptr; c <= d; c++)
4088 {
4089 if ((co = UCD_CASESET(c)) != 0)
4090 {
4091 *ocptr = c++; /* Character that has the set */
4092 *cptr = c; /* Rest of input range */
4093 return (int)co;
4094 }
4095 if ((othercase = UCD_OTHERCASE(c)) != c) break;
4096 }
4097
4098 if (c > d) return -1; /* Reached end of range */
4099
4100 /* Found a character that has a single other case. Search for the end of the
4101 range, which is either the end of the input range, or a character that has zero
4102 or more than one other cases. */
4103
4104 *ocptr = othercase;
4105 next = othercase + 1;
4106
4107 for (++c; c <= d; c++)
4108 {
4109 if ((co = UCD_CASESET(c)) != 0 || UCD_OTHERCASE(c) != next) break;
4110 next++;
4111 }
4112
4113 *odptr = next - 1; /* End of othercase range */
4114 *cptr = c; /* Rest of input range */
4115 return 0;
4116 }
4117 #endif /* SUPPORT_UCP */
4118
4119
4120
4121 /*************************************************
4122 * Add a character or range to a class *
4123 *************************************************/
4124
4125 /* This function packages up the logic of adding a character or range of
4126 characters to a class. The character values in the arguments will be within the
4127 valid values for the current mode (8-bit, 16-bit, UTF, etc). This function is
4128 mutually recursive with the function immediately below.
4129
4130 Arguments:
4131 classbits the bit map for characters < 256
4132 uchardptr points to the pointer for extra data
4133 options the options word
4134 cd contains pointers to tables etc.
4135 start start of range character
4136 end end of range character
4137
4138 Returns: the number of < 256 characters added
4139 the pointer to extra data is updated
4140 */
4141
4142 static int
4143 add_to_class(pcre_uint8 *classbits, pcre_uchar **uchardptr, int options,
4144 compile_data *cd, pcre_uint32 start, pcre_uint32 end)
4145 {
4146 pcre_uint32 c;
4147 pcre_uint32 classbits_end = (end <= 0xff ? end : 0xff);
4148 int n8 = 0;
4149
4150 /* If caseless matching is required, scan the range and process alternate
4151 cases. In Unicode, there are 8-bit characters that have alternate cases that
4152 are greater than 255 and vice-versa. Sometimes we can just extend the original
4153 range. */
4154
4155 if ((options & PCRE_CASELESS) != 0)
4156 {
4157 #ifdef SUPPORT_UCP
4158 if ((options & PCRE_UTF8) != 0)
4159 {
4160 int rc;
4161 pcre_uint32 oc, od;
4162
4163 options &= ~PCRE_CASELESS; /* Remove for recursive calls */
4164 c = start;
4165
4166 while ((rc = get_othercase_range(&c, end, &oc, &od)) >= 0)
4167 {
4168 /* Handle a single character that has more than one other case. */
4169
4170 if (rc > 0) n8 += add_list_to_class(classbits, uchardptr, options, cd,
4171 PRIV(ucd_caseless_sets) + rc, oc);
4172
4173 /* Do nothing if the other case range is within the original range. */
4174
4175 else if (oc >= start && od <= end) continue;
4176
4177 /* Extend the original range if there is overlap, noting that if oc < c, we
4178 can't have od > end because a subrange is always shorter than the basic
4179 range. Otherwise, use a recursive call to add the additional range. */
4180
4181 else if (oc < start && od >= start - 1) start = oc; /* Extend downwards */
4182 else if (od > end && oc <= end + 1) end = od; /* Extend upwards */
4183 else n8 += add_to_class(classbits, uchardptr, options, cd, oc, od);
4184 }
4185 }
4186 else
4187 #endif /* SUPPORT_UCP */
4188
4189 /* Not UTF-mode, or no UCP */
4190
4191 for (c = start; c <= classbits_end; c++)
4192 {
4193 SETBIT(classbits, cd->fcc[c]);
4194 n8++;
4195 }
4196 }
4197
4198 /* Now handle the original range. Adjust the final value according to the bit
4199 length - this means that the same lists of (e.g.) horizontal spaces can be used
4200 in all cases. */
4201
4202 #if defined COMPILE_PCRE8
4203 #ifdef SUPPORT_UTF
4204 if ((options & PCRE_UTF8) == 0)
4205 #endif
4206 if (end > 0xff) end = 0xff;
4207
4208 #elif defined COMPILE_PCRE16
4209 #ifdef SUPPORT_UTF
4210 if ((options & PCRE_UTF16) == 0)
4211 #endif
4212 if (end > 0xffff) end = 0xffff;
4213
4214 #endif /* COMPILE_PCRE[8|16] */
4215
4216 /* Use the bitmap for characters < 256. Otherwise use extra data.*/
4217
4218 for (c = start; c <= classbits_end; c++)
4219 {
4220 /* Regardless of start, c will always be <= 255. */
4221 SETBIT(classbits, c);
4222 n8++;
4223 }
4224
4225 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
4226 if (start <= 0xff) start = 0xff + 1;
4227
4228 if (end >= start)
4229 {
4230 pcre_uchar *uchardata = *uchardptr;
4231 #ifdef SUPPORT_UTF
4232 if ((options & PCRE_UTF8) != 0) /* All UTFs use the same flag bit */
4233 {
4234 if (start < end)
4235 {
4236 *uchardata++ = XCL_RANGE;
4237 uchardata += PRIV(ord2utf)(start, uchardata);
4238 uchardata += PRIV(ord2utf)(end, uchardata);
4239 }
4240 else if (start == end)
4241 {
4242 *uchardata++ = XCL_SINGLE;
4243 uchardata += PRIV(ord2utf)(start, uchardata);
4244 }
4245 }
4246 else
4247 #endif /* SUPPORT_UTF */
4248
4249 /* Without UTF support, character values are constrained by the bit length,
4250 and can only be > 256 for 16-bit and 32-bit libraries. */
4251
4252 #ifdef COMPILE_PCRE8
4253 {}
4254 #else
4255 if (start < end)
4256 {
4257 *uchardata++ = XCL_RANGE;
4258 *uchardata++ = start;
4259 *uchardata++ = end;
4260 }
4261 else if (start == end)
4262 {
4263 *uchardata++ = XCL_SINGLE;
4264 *uchardata++ = start;
4265 }
4266 #endif
4267
4268 *uchardptr = uchardata; /* Updata extra data pointer */
4269 }
4270 #endif /* SUPPORT_UTF || !COMPILE_PCRE8 */
4271
4272 return n8; /* Number of 8-bit characters */
4273 }
4274
4275
4276
4277
4278 /*************************************************
4279 * Add a list of characters to a class *
4280 *************************************************/
4281
4282 /* This function is used for adding a list of case-equivalent characters to a
4283 class, and also for adding a list of horizontal or vertical whitespace. If the
4284 list is in order (which it should be), ranges of characters are detected and
4285 handled appropriately. This function is mutually recursive with the function
4286 above.
4287
4288 Arguments:
4289 classbits the bit map for characters < 256
4290 uchardptr points to the pointer for extra data
4291 options the options word
4292 cd contains pointers to tables etc.
4293 p points to row of 32-bit values, terminated by NOTACHAR
4294 except character to omit; this is used when adding lists of
4295 case-equivalent characters to avoid including the one we
4296 already know about
4297
4298 Returns: the number of < 256 characters added
4299 the pointer to extra data is updated
4300 */
4301
4302 static int
4303 add_list_to_class(pcre_uint8 *classbits, pcre_uchar **uchardptr, int options,
4304 compile_data *cd, const pcre_uint32 *p, unsigned int except)
4305 {
4306 int n8 = 0;
4307 while (p[0] < NOTACHAR)
4308 {
4309 int n = 0;
4310 if (p[0] != except)
4311 {
4312 while(p[n+1] == p[0] + n + 1) n++;
4313 n8 += add_to_class(classbits, uchardptr, options, cd, p[0], p[n]);
4314 }
4315 p += n + 1;
4316 }
4317 return n8;
4318 }
4319
4320
4321
4322 /*************************************************
4323 * Add characters not in a list to a class *
4324 *************************************************/
4325
4326 /* This function is used for adding the complement of a list of horizontal or
4327 vertical whitespace to a class. The list must be in order.
4328
4329 Arguments:
4330 classbits the bit map for characters < 256
4331 uchardptr points to the pointer for extra data
4332 options the options word
4333 cd contains pointers to tables etc.
4334 p points to row of 32-bit values, terminated by NOTACHAR
4335
4336 Returns: the number of < 256 characters added
4337 the pointer to extra data is updated
4338 */
4339
4340 static int
4341 add_not_list_to_class(pcre_uint8 *classbits, pcre_uchar **uchardptr,
4342 int options, compile_data *cd, const pcre_uint32 *p)
4343 {
4344 BOOL utf = (options & PCRE_UTF8) != 0;
4345 int n8 = 0;
4346 if (p[0] > 0)
4347 n8 += add_to_class(classbits, uchardptr, options, cd, 0, p[0] - 1);
4348 while (p[0] < NOTACHAR)
4349 {
4350 while (p[1] == p[0] + 1) p++;
4351 n8 += add_to_class(classbits, uchardptr, options, cd, p[0] + 1,
4352 (p[1] == NOTACHAR) ? (utf ? 0x10ffffu : 0xffffffffu) : p[1] - 1);
4353 p++;
4354 }
4355 return n8;
4356 }
4357
4358
4359
4360 /*************************************************
4361 * Compile one branch *
4362 *************************************************/
4363
4364 /* Scan the pattern, compiling it into the a vector. If the options are
4365 changed during the branch, the pointer is used to change the external options
4366 bits. This function is used during the pre-compile phase when we are trying
4367 to find out the amount of memory needed, as well as during the real compile
4368 phase. The value of lengthptr distinguishes the two phases.
4369
4370 Arguments:
4371 optionsptr pointer to the option bits
4372 codeptr points to the pointer to the current code point
4373 ptrptr points to the current pattern pointer
4374 errorcodeptr points to error code variable
4375 firstcharptr place to put the first required character
4376 firstcharflagsptr place to put the first character flags, or a negative number
4377 reqcharptr place to put the last required character
4378 reqcharflagsptr place to put the last required character flags, or a negative number
4379 bcptr points to current branch chain
4380 cond_depth conditional nesting depth
4381 cd contains pointers to tables etc.
4382 lengthptr NULL during the real compile phase
4383 points to length accumulator during pre-compile phase
4384
4385 Returns: TRUE on success
4386 FALSE, with *errorcodeptr set non-zero on error
4387 */
4388
4389 static BOOL
4390 compile_branch(int *optionsptr, pcre_uchar **codeptr,
4391 const pcre_uchar **ptrptr, int *errorcodeptr,
4392 pcre_uint32 *firstcharptr, pcre_int32 *firstcharflagsptr,
4393 pcre_uint32 *reqcharptr, pcre_int32 *reqcharflagsptr,
4394 branch_chain *bcptr, int cond_depth,
4395 compile_data *cd, int *lengthptr)
4396 {
4397 int repeat_type, op_type;
4398 int repeat_min = 0, repeat_max = 0; /* To please picky compilers */
4399 int bravalue = 0;
4400 int greedy_default, greedy_non_default;
4401 pcre_uint32 firstchar, reqchar;
4402 pcre_int32 firstcharflags, reqcharflags;
4403 pcre_uint32 zeroreqchar, zerofirstchar;
4404 pcre_int32 zeroreqcharflags, zerofirstcharflags;
4405 pcre_int32 req_caseopt, reqvary, tempreqvary;
4406 int options = *optionsptr; /* May change dynamically */
4407 int after_manual_callout = 0;
4408 int length_prevgroup = 0;
4409 register pcre_uint32 c;
4410 int escape;
4411 register pcre_uchar *code = *codeptr;
4412 pcre_uchar *last_code = code;
4413 pcre_uchar *orig_code = code;
4414 pcre_uchar *tempcode;
4415 BOOL inescq = FALSE;
4416 BOOL groupsetfirstchar = FALSE;
4417 const pcre_uchar *ptr = *ptrptr;
4418 const pcre_uchar *tempptr;
4419 const pcre_uchar *nestptr = NULL;
4420 pcre_uchar *previous = NULL;
4421 pcre_uchar *previous_callout = NULL;
4422 pcre_uchar *save_hwm = NULL;
4423 pcre_uint8 classbits[32];
4424
4425 /* We can fish out the UTF-8 setting once and for all into a BOOL, but we
4426 must not do this for other options (e.g. PCRE_EXTENDED) because they may change
4427 dynamically as we process the pattern. */
4428
4429 #ifdef SUPPORT_UTF
4430 /* PCRE_UTF[16|32] have the same value as PCRE_UTF8. */
4431 BOOL utf = (options & PCRE_UTF8) != 0;
4432 #ifndef COMPILE_PCRE32
4433 pcre_uchar utf_chars[6];
4434 #endif
4435 #else
4436 BOOL utf = FALSE;
4437 #endif
4438
4439 /* Helper variables for OP_XCLASS opcode (for characters > 255). We define
4440 class_uchardata always so that it can be passed to add_to_class() always,
4441 though it will not be used in non-UTF 8-bit cases. This avoids having to supply
4442 alternative calls for the different cases. */
4443
4444 pcre_uchar *class_uchardata;
4445 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
4446 BOOL xclass;
4447 pcre_uchar *class_uchardata_base;
4448 #endif
4449
4450 #ifdef PCRE_DEBUG
4451 if (lengthptr != NULL) DPRINTF((">> start branch\n"));
4452 #endif
4453
4454 /* Set up the default and non-default settings for greediness */
4455
4456 greedy_default = ((options & PCRE_UNGREEDY) != 0);
4457 greedy_non_default = greedy_default ^ 1;
4458
4459 /* Initialize no first byte, no required byte. REQ_UNSET means "no char
4460 matching encountered yet". It gets changed to REQ_NONE if we hit something that
4461 matches a non-fixed char first char; reqchar just remains unset if we never
4462 find one.
4463
4464 When we hit a repeat whose minimum is zero, we may have to adjust these values
4465 to take the zero repeat into account. This is implemented by setting them to
4466 zerofirstbyte and zeroreqchar when such a repeat is encountered. The individual
4467 item types that can be repeated set these backoff variables appropriately. */
4468
4469 firstchar = reqchar = zerofirstchar = zeroreqchar = 0;
4470 firstcharflags = reqcharflags = zerofirstcharflags = zeroreqcharflags = REQ_UNSET;
4471
4472 /* The variable req_caseopt contains either the REQ_CASELESS value
4473 or zero, according to the current setting of the caseless flag. The
4474 REQ_CASELESS leaves the lower 28 bit empty. It is added into the
4475 firstchar or reqchar variables to record the case status of the
4476 value. This is used only for ASCII characters. */
4477
4478 req_caseopt = ((options & PCRE_CASELESS) != 0)? REQ_CASELESS:0;
4479
4480 /* Switch on next character until the end of the branch */
4481
4482 for (;; ptr++)
4483 {
4484 BOOL negate_class;
4485 BOOL should_flip_negation;
4486 BOOL possessive_quantifier;
4487 BOOL is_quantifier;
4488 BOOL is_recurse;
4489 BOOL reset_bracount;
4490 int class_has_8bitchar;
4491 int class_one_char;
4492 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
4493 BOOL xclass_has_prop;
4494 #endif
4495 int newoptions;
4496 int recno;
4497 int refsign;
4498 int skipbytes;
4499 pcre_uint32 subreqchar, subfirstchar;
4500 pcre_int32 subreqcharflags, subfirstcharflags;
4501 int terminator;
4502 unsigned int mclength;
4503 unsigned int tempbracount;
4504 pcre_uint32 ec;
4505 pcre_uchar mcbuffer[8];
4506
4507 /* Get next character in the pattern */
4508
4509 c = *ptr;
4510
4511 /* If we are at the end of a nested substitution, revert to the outer level
4512 string. Nesting only happens one level deep. */
4513
4514 if (c == CHAR_NULL && nestptr != NULL)
4515 {
4516 ptr = nestptr;
4517 nestptr = NULL;
4518 c = *ptr;
4519 }
4520
4521 /* If we are in the pre-compile phase, accumulate the length used for the
4522 previous cycle of this loop. */
4523
4524 if (lengthptr != NULL)
4525 {
4526 #ifdef PCRE_DEBUG
4527 if (code > cd->hwm) cd->hwm = code; /* High water info */
4528 #endif
4529 if (code > cd->start_workspace + cd->workspace_size -
4530 WORK_SIZE_SAFETY_MARGIN) /* Check for overrun */
4531 {
4532 *errorcodeptr = ERR52;
4533 goto FAILED;
4534 }
4535
4536 /* There is at least one situation where code goes backwards: this is the
4537 case of a zero quantifier after a class (e.g. [ab]{0}). At compile time,
4538 the class is simply eliminated. However, it is created first, so we have to
4539 allow memory for it. Therefore, don't ever reduce the length at this point.
4540 */
4541
4542 if (code < last_code) code = last_code;
4543
4544 /* Paranoid check for integer overflow */
4545
4546 if (OFLOW_MAX - *lengthptr < code - last_code)
4547 {
4548 *errorcodeptr = ERR20;
4549 goto FAILED;
4550 }
4551
4552 *lengthptr += (int)(code - last_code);
4553 DPRINTF(("length=%d added %d c=%c (0x%x)\n", *lengthptr,
4554 (int)(code - last_code), c, c));
4555
4556 /* If "previous" is set and it is not at the start of the work space, move
4557 it back to there, in order to avoid filling up the work space. Otherwise,
4558 if "previous" is NULL, reset the current code pointer to the start. */
4559
4560 if (previous != NULL)
4561 {
4562 if (previous > orig_code)
4563 {
4564 memmove(orig_code, previous, IN_UCHARS(code - previous));
4565 code -= previous - orig_code;
4566 previous = orig_code;
4567 }
4568 }
4569 else code = orig_code;
4570
4571 /* Remember where this code item starts so we can pick up the length
4572 next time round. */
4573
4574 last_code = code;
4575 }
4576
4577 /* In the real compile phase, just check the workspace used by the forward
4578 reference list. */
4579
4580 else if (cd->hwm > cd->start_workspace + cd->workspace_size -
4581 WORK_SIZE_SAFETY_MARGIN)
4582 {
4583 *errorcodeptr = ERR52;
4584 goto FAILED;
4585 }
4586
4587 /* If in \Q...\E, check for the end; if not, we have a literal */
4588
4589 if (inescq && c != CHAR_NULL)
4590 {
4591 if (c == CHAR_BACKSLASH && ptr[1] == CHAR_E)
4592 {
4593 inescq = FALSE;
4594 ptr++;
4595 continue;
4596 }
4597 else
4598 {
4599 if (previous_callout != NULL)
4600 {
4601 if (lengthptr == NULL) /* Don't attempt in pre-compile phase */
4602 complete_callout(previous_callout, ptr, cd);
4603 previous_callout = NULL;
4604 }
4605 if ((options & PCRE_AUTO_CALLOUT) != 0)
4606 {
4607 previous_callout = code;
4608 code = auto_callout(code, ptr, cd);
4609 }
4610 goto NORMAL_CHAR;
4611 }
4612 /* Control does not reach here. */
4613 }
4614
4615 /* In extended mode, skip white space and comments. We need a loop in order
4616 to check for more white space and more comments after a comment. */
4617
4618 if ((options & PCRE_EXTENDED) != 0)
4619 {
4620 for (;;)
4621 {
4622 while (MAX_255(c) && (cd->ctypes[c] & ctype_space) != 0) c = *(++ptr);
4623 if (c != CHAR_NUMBER_SIGN) break;
4624 ptr++;
4625 while (*ptr != CHAR_NULL)
4626 {
4627 if (IS_NEWLINE(ptr)) /* For non-fixed-length newline cases, */
4628 { /* IS_NEWLINE sets cd->nllen. */
4629 ptr += cd->nllen;
4630 break;
4631 }
4632 ptr++;
4633 #ifdef SUPPORT_UTF
4634 if (utf) FORWARDCHAR(ptr);
4635 #endif
4636 }
4637 c = *ptr; /* Either NULL or the char after a newline */
4638 }
4639 }
4640
4641 /* See if the next thing is a quantifier. */
4642
4643 is_quantifier =
4644 c == CHAR_ASTERISK || c == CHAR_PLUS || c == CHAR_QUESTION_MARK ||
4645 (c == CHAR_LEFT_CURLY_BRACKET && is_counted_repeat(ptr+1));
4646
4647 /* Fill in length of a previous callout, except when the next thing is a
4648 quantifier or when processing a property substitution string in UCP mode. */
4649
4650 if (!is_quantifier && previous_callout != NULL && nestptr == NULL &&
4651 after_manual_callout-- <= 0)
4652 {
4653 if (lengthptr == NULL) /* Don't attempt in pre-compile phase */
4654 complete_callout(previous_callout, ptr, cd);
4655 previous_callout = NULL;
4656 }
4657
4658 /* Create auto callout, except for quantifiers, or while processing property
4659 strings that are substituted for \w etc in UCP mode. */
4660
4661 if ((options & PCRE_AUTO_CALLOUT) != 0 && !is_quantifier && nestptr == NULL)
4662 {
4663 previous_callout = code;
4664 code = auto_callout(code, ptr, cd);
4665 }
4666
4667 /* Process the next pattern item. */
4668
4669 switch(c)
4670 {
4671 /* ===================================================================*/
4672 case CHAR_NULL: /* The branch terminates at string end */
4673 case CHAR_VERTICAL_LINE: /* or | or ) */
4674 case CHAR_RIGHT_PARENTHESIS:
4675 *firstcharptr = firstchar;
4676 *firstcharflagsptr = firstcharflags;
4677 *reqcharptr = reqchar;
4678 *reqcharflagsptr = reqcharflags;
4679 *codeptr = code;
4680 *ptrptr = ptr;
4681 if (lengthptr != NULL)
4682 {
4683 if (OFLOW_MAX - *lengthptr < code - last_code)
4684 {
4685 *errorcodeptr = ERR20;
4686 goto FAILED;
4687 }
4688 *lengthptr += (int)(code - last_code); /* To include callout length */
4689 DPRINTF((">> end branch\n"));
4690 }
4691 return TRUE;
4692
4693
4694 /* ===================================================================*/
4695 /* Handle single-character metacharacters. In multiline mode, ^ disables
4696 the setting of any following char as a first character. */
4697
4698 case CHAR_CIRCUMFLEX_ACCENT:
4699 previous = NULL;
4700 if ((options & PCRE_MULTILINE) != 0)
4701 {
4702 if (firstcharflags == REQ_UNSET)
4703 zerofirstcharflags = firstcharflags = REQ_NONE;
4704 *code++ = OP_CIRCM;
4705 }
4706 else *code++ = OP_CIRC;
4707 break;
4708
4709 case CHAR_DOLLAR_SIGN:
4710 previous = NULL;
4711 *code++ = ((options & PCRE_MULTILINE) != 0)? OP_DOLLM : OP_DOLL;
4712 break;
4713
4714 /* There can never be a first char if '.' is first, whatever happens about
4715 repeats. The value of reqchar doesn't change either. */
4716
4717 case CHAR_DOT:
4718 if (firstcharflags == REQ_UNSET) firstcharflags = REQ_NONE;
4719 zerofirstchar = firstchar;
4720 zerofirstcharflags = firstcharflags;
4721 zeroreqchar = reqchar;
4722 zeroreqcharflags = reqcharflags;
4723 previous = code;
4724 *code++ = ((options & PCRE_DOTALL) != 0)? OP_ALLANY: OP_ANY;
4725 break;
4726
4727
4728 /* ===================================================================*/
4729 /* Character classes. If the included characters are all < 256, we build a
4730 32-byte bitmap of the permitted characters, except in the special case
4731 where there is only one such character. For negated classes, we build the
4732 map as usual, then invert it at the end. However, we use a different opcode
4733 so that data characters > 255 can be handled correctly.
4734
4735 If the class contains characters outside the 0-255 range, a different
4736 opcode is compiled. It may optionally have a bit map for characters < 256,
4737 but those above are are explicitly listed afterwards. A flag byte tells
4738 whether the bitmap is present, and whether this is a negated class or not.
4739
4740 In JavaScript compatibility mode, an isolated ']' causes an error. In
4741 default (Perl) mode, it is treated as a data character. */
4742
4743 case CHAR_RIGHT_SQUARE_BRACKET:
4744 if ((cd->external_options & PCRE_JAVASCRIPT_COMPAT) != 0)
4745 {
4746 *errorcodeptr = ERR64;
4747 goto FAILED;
4748 }
4749 goto NORMAL_CHAR;
4750
4751 /* In another (POSIX) regex library, the ugly syntax [[:<:]] and [[:>:]] is
4752 used for "start of word" and "end of word". As these are otherwise illegal
4753 sequences, we don't break anything by recognizing them. They are replaced
4754 by \b(?=\w) and \b(?<=\w) respectively. Sequences like [a[:<:]] are
4755 erroneous and are handled by the normal code below. */
4756
4757 case CHAR_LEFT_SQUARE_BRACKET:
4758 if (STRNCMP_UC_C8(ptr+1, STRING_WEIRD_STARTWORD, 6) == 0)
4759 {
4760 nestptr = ptr + 7;
4761 ptr = sub_start_of_word - 1;
4762 continue;
4763 }
4764
4765 if (STRNCMP_UC_C8(ptr+1, STRING_WEIRD_ENDWORD, 6) == 0)
4766 {
4767 nestptr = ptr + 7;
4768 ptr = sub_end_of_word - 1;
4769 continue;
4770 }
4771
4772 /* Handle a real character class. */
4773
4774 previous = code;
4775
4776 /* PCRE supports POSIX class stuff inside a class. Perl gives an error if
4777 they are encountered at the top level, so we'll do that too. */
4778
4779 if ((ptr[1] == CHAR_COLON || ptr[1] == CHAR_DOT ||
4780 ptr[1] == CHAR_EQUALS_SIGN) &&
4781 check_posix_syntax(ptr, &tempptr))
4782 {
4783 *errorcodeptr = (ptr[1] == CHAR_COLON)? ERR13 : ERR31;
4784 goto FAILED;
4785 }
4786
4787 /* If the first character is '^', set the negation flag and skip it. Also,
4788 if the first few characters (either before or after ^) are \Q\E or \E we
4789 skip them too. This makes for compatibility with Perl. */
4790
4791 negate_class = FALSE;
4792 for (;;)
4793 {
4794 c = *(++ptr);
4795 if (c == CHAR_BACKSLASH)
4796 {
4797 if (ptr[1] == CHAR_E)
4798 ptr++;
4799 else if (STRNCMP_UC_C8(ptr + 1, STR_Q STR_BACKSLASH STR_E, 3) == 0)
4800 ptr += 3;
4801 else
4802 break;
4803 }
4804 else if (!negate_class && c == CHAR_CIRCUMFLEX_ACCENT)
4805 negate_class = TRUE;
4806 else break;
4807 }
4808
4809 /* Empty classes are allowed in JavaScript compatibility mode. Otherwise,
4810 an initial ']' is taken as a data character -- the code below handles
4811 that. In JS mode, [] must always fail, so generate OP_FAIL, whereas
4812 [^] must match any character, so generate OP_ALLANY. */
4813
4814 if (c == CHAR_RIGHT_SQUARE_BRACKET &&
4815 (cd->external_options & PCRE_JAVASCRIPT_COMPAT) != 0)
4816 {
4817 *code++ = negate_class? OP_ALLANY : OP_FAIL;
4818 if (firstcharflags == REQ_UNSET) firstcharflags = REQ_NONE;
4819 zerofirstchar = firstchar;
4820 zerofirstcharflags = firstcharflags;
4821 break;
4822 }
4823
4824 /* If a class contains a negative special such as \S, we need to flip the
4825 negation flag at the end, so that support for characters > 255 works
4826 correctly (they are all included in the class). */
4827
4828 should_flip_negation = FALSE;
4829
4830 /* Extended class (xclass) will be used when characters > 255
4831 might match. */
4832
4833 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
4834 xclass = FALSE;
4835 class_uchardata = code + LINK_SIZE + 2; /* For XCLASS items */
4836 class_uchardata_base = class_uchardata; /* Save the start */
4837 #endif
4838
4839 /* For optimization purposes, we track some properties of the class:
4840 class_has_8bitchar will be non-zero if the class contains at least one <
4841 256 character; class_one_char will be 1 if the class contains just one
4842 character; xclass_has_prop will be TRUE if unicode property checks
4843 are present in the class. */
4844
4845 class_has_8bitchar = 0;
4846 class_one_char = 0;
4847 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
4848 xclass_has_prop = FALSE;
4849 #endif
4850
4851 /* Initialize the 32-char bit map to all zeros. We build the map in a
4852 temporary bit of memory, in case the class contains fewer than two
4853 8-bit characters because in that case the compiled code doesn't use the bit
4854 map. */
4855
4856 memset(classbits, 0, 32 * sizeof(pcre_uint8));
4857
4858 /* Process characters until ] is reached. By writing this as a "do" it
4859 means that an initial ] is taken as a data character. At the start of the
4860 loop, c contains the first byte of the character. */
4861
4862 if (c != CHAR_NULL) do
4863 {
4864 const pcre_uchar *oldptr;
4865
4866 #ifdef SUPPORT_UTF
4867 if (utf && HAS_EXTRALEN(c))
4868 { /* Braces are required because the */
4869 GETCHARLEN(c, ptr, ptr); /* macro generates multiple statements */
4870 }
4871 #endif
4872
4873 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
4874 /* In the pre-compile phase, accumulate the length of any extra
4875 data and reset the pointer. This is so that very large classes that
4876 contain a zillion > 255 characters no longer overwrite the work space
4877 (which is on the stack). We have to remember that there was XCLASS data,
4878 however. */
4879
4880 if (lengthptr != NULL && class_uchardata > class_uchardata_base)
4881 {
4882 xclass = TRUE;
4883 *lengthptr += (int)(class_uchardata - class_uchardata_base);
4884 class_uchardata = class_uchardata_base;
4885 }
4886 #endif
4887
4888 /* Inside \Q...\E everything is literal except \E */
4889
4890 if (inescq)
4891 {
4892 if (c == CHAR_BACKSLASH && ptr[1] == CHAR_E) /* If we are at \E */
4893 {
4894 inescq = FALSE; /* Reset literal state */
4895 ptr++; /* Skip the 'E' */
4896 continue; /* Carry on with next */
4897 }
4898 goto CHECK_RANGE; /* Could be range if \E follows */
4899 }
4900
4901 /* Handle POSIX class names. Perl allows a negation extension of the
4902 form [:^name:]. A square bracket that doesn't match the syntax is
4903 treated as a literal. We also recognize the POSIX constructions
4904 [.ch.] and [=ch=] ("collating elements") and fault them, as Perl
4905 5.6 and 5.8 do. */
4906
4907 if (c == CHAR_LEFT_SQUARE_BRACKET &&
4908 (ptr[1] == CHAR_COLON || ptr[1] == CHAR_DOT ||
4909 ptr[1] == CHAR_EQUALS_SIGN) && check_posix_syntax(ptr, &tempptr))
4910 {
4911 BOOL local_negate = FALSE;
4912 int posix_class, taboffset, tabopt;
4913 register const pcre_uint8 *cbits = cd->cbits;
4914 pcre_uint8 pbits[32];
4915
4916 if (ptr[1] != CHAR_COLON)
4917 {
4918 *errorcodeptr = ERR31;
4919 goto FAILED;
4920 }
4921
4922 ptr += 2;
4923 if (*ptr == CHAR_CIRCUMFLEX_ACCENT)
4924 {
4925 local_negate = TRUE;
4926 should_flip_negation = TRUE; /* Note negative special */
4927 ptr++;
4928 }
4929
4930 posix_class = check_posix_name(ptr, (int)(tempptr - ptr));
4931 if (posix_class < 0)
4932 {
4933 *errorcodeptr = ERR30;
4934 goto FAILED;
4935 }
4936
4937 /* If matching is caseless, upper and lower are converted to
4938 alpha. This relies on the fact that the class table starts with
4939 alpha, lower, upper as the first 3 entries. */
4940
4941 if ((options & PCRE_CASELESS) != 0 && posix_class <= 2)
4942 posix_class = 0;
4943
4944 /* When PCRE_UCP is set, some of the POSIX classes are converted to
4945 different escape sequences that use Unicode properties \p or \P. Others
4946 that are not available via \p or \P generate XCL_PROP/XCL_NOTPROP
4947 directly. */
4948
4949 #ifdef SUPPORT_UCP
4950 if ((options & PCRE_UCP) != 0)
4951 {
4952 unsigned int ptype = 0;
4953 int pc = posix_class + ((local_negate)? POSIX_SUBSIZE/2 : 0);
4954
4955 /* The posix_substitutes table specifies which POSIX classes can be
4956 converted to \p or \P items. */
4957
4958 if (posix_substitutes[pc] != NULL)
4959 {
4960 nestptr = tempptr + 1;
4961 ptr = posix_substitutes[pc] - 1;
4962 continue;
4963 }
4964
4965 /* There are three other classes that generate special property calls
4966 that are recognized only in an XCLASS. */
4967
4968 else switch(posix_class)
4969 {
4970 case PC_GRAPH:
4971 ptype = PT_PXGRAPH;
4972 /* Fall through */
4973 case PC_PRINT:
4974 if (ptype == 0) ptype = PT_PXPRINT;
4975 /* Fall through */
4976 case PC_PUNCT:
4977 if (ptype == 0) ptype = PT_PXPUNCT;
4978 *class_uchardata++ = local_negate? XCL_NOTPROP : XCL_PROP;
4979 *class_uchardata++ = ptype;
4980 *class_uchardata++ = 0;
4981 xclass_has_prop = TRUE;
4982 ptr = tempptr + 1;
4983 continue;
4984
4985 /* For all other POSIX classes, no special action is taken in UCP
4986 mode. Fall through to the non_UCP case. */
4987
4988 default:
4989 break;
4990 }
4991 }
4992 #endif
4993 /* In the non-UCP case, or when UCP makes no difference, we build the
4994 bit map for the POSIX class in a chunk of local store because we may be
4995 adding and subtracting from it, and we don't want to subtract bits that
4996 may be in the main map already. At the end we or the result into the
4997 bit map that is being built. */
4998
4999 posix_class *= 3;
5000
5001 /* Copy in the first table (always present) */
5002
5003 memcpy(pbits, cbits + posix_class_maps[posix_class],
5004 32 * sizeof(pcre_uint8));
5005
5006 /* If there is a second table, add or remove it as required. */
5007
5008 taboffset = posix_class_maps[posix_class + 1];
5009 tabopt = posix_class_maps[posix_class + 2];
5010
5011 if (taboffset >= 0)
5012 {
5013 if (tabopt >= 0)
5014 for (c = 0; c < 32; c++) pbits[c] |= cbits[c + taboffset];
5015 else
5016 for (c = 0; c < 32; c++) pbits[c] &= ~cbits[c + taboffset];
5017 }
5018
5019 /* Now see if we need to remove any special characters. An option
5020 value of 1 removes vertical space and 2 removes underscore. */
5021
5022 if (tabopt < 0) tabopt = -tabopt;
5023 if (tabopt == 1) pbits[1] &= ~0x3c;
5024 else if (tabopt == 2) pbits[11] &= 0x7f;
5025
5026 /* Add the POSIX table or its complement into the main table that is
5027 being built and we are done. */
5028
5029 if (local_negate)
5030 for (c = 0; c < 32; c++) classbits[c] |= ~pbits[c];
5031 else
5032 for (c = 0; c < 32; c++) classbits[c] |= pbits[c];
5033
5034 ptr = tempptr + 1;
5035 /* Every class contains at least one < 256 character. */
5036 class_has_8bitchar = 1;
5037 /* Every class contains at least two characters. */
5038 class_one_char = 2;
5039 continue; /* End of POSIX syntax handling */
5040 }
5041
5042 /* Backslash may introduce a single character, or it may introduce one
5043 of the specials, which just set a flag. The sequence \b is a special
5044 case. Inside a class (and only there) it is treated as backspace. We
5045 assume that other escapes have more than one character in them, so
5046 speculatively set both class_has_8bitchar and class_one_char bigger
5047 than one. Unrecognized escapes fall through and are either treated
5048 as literal characters (by default), or are faulted if
5049 PCRE_EXTRA is set. */
5050
5051 if (c == CHAR_BACKSLASH)
5052 {
5053 escape = check_escape(&ptr, &ec, errorcodeptr, cd->bracount, options,
5054 TRUE);
5055 if (*errorcodeptr != 0) goto FAILED;
5056 if (escape == 0) c = ec;
5057 else if (escape == ESC_b) c = CHAR_BS; /* \b is backspace in a class */
5058 else if (escape == ESC_N) /* \N is not supported in a class */
5059 {
5060 *errorcodeptr = ERR71;
5061 goto FAILED;
5062 }
5063 else if (escape == ESC_Q) /* Handle start of quoted string */
5064 {
5065 if (ptr[1] == CHAR_BACKSLASH && ptr[2] == CHAR_E)
5066 {
5067 ptr += 2; /* avoid empty string */
5068 }
5069 else inescq = TRUE;
5070 continue;
5071 }
5072 else if (escape == ESC_E) continue; /* Ignore orphan \E */
5073
5074 else
5075 {
5076 register const pcre_uint8 *cbits = cd->cbits;
5077 /* Every class contains at least two < 256 characters. */
5078 class_has_8bitchar++;
5079 /* Every class contains at least two characters. */
5080 class_one_char += 2;
5081
5082 switch (escape)
5083 {
5084 #ifdef SUPPORT_UCP
5085 case ESC_du: /* These are the values given for \d etc */
5086 case ESC_DU: /* when PCRE_UCP is set. We replace the */
5087 case ESC_wu: /* escape sequence with an appropriate \p */
5088 case ESC_WU: /* or \P to test Unicode properties instead */
5089 case ESC_su: /* of the default ASCII testing. */
5090 case ESC_SU:
5091 nestptr = ptr;
5092 ptr = substitutes[escape - ESC_DU] - 1; /* Just before substitute */
5093 class_has_8bitchar--; /* Undo! */
5094 continue;
5095 #endif
5096 case ESC_d:
5097 for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_digit];
5098 continue;
5099
5100 case ESC_D:
5101 should_flip_negation = TRUE;
5102 for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_digit];
5103 continue;
5104
5105 case ESC_w:
5106 for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_word];
5107 continue;
5108
5109 case ESC_W:
5110 should_flip_negation = TRUE;
5111 for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_word];
5112 continue;
5113
5114 /* Perl 5.004 onwards omitted VT from \s, but restored it at Perl
5115 5.18. Before PCRE 8.34, we had to preserve the VT bit if it was
5116 previously set by something earlier in the character class.
5117 Luckily, the value of CHAR_VT is 0x0b in both ASCII and EBCDIC, so
5118 we could just adjust the appropriate bit. From PCRE 8.34 we no
5119 longer treat \s and \S specially. */
5120
5121 case ESC_s:
5122 for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_space];
5123 continue;
5124
5125 case ESC_S:
5126 should_flip_negation = TRUE;
5127 for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_space];
5128 continue;
5129
5130 /* The rest apply in both UCP and non-UCP cases. */
5131
5132 case ESC_h:
5133 (void)add_list_to_class(classbits, &class_uchardata, options, cd,
5134 PRIV(hspace_list), NOTACHAR);
5135 continue;
5136
5137 case ESC_H:
5138 (void)add_not_list_to_class(classbits, &class_uchardata, options,
5139 cd, PRIV(hspace_list));
5140 continue;
5141
5142 case ESC_v:
5143 (void)add_list_to_class(classbits, &class_uchardata, options, cd,
5144 PRIV(vspace_list), NOTACHAR);
5145 continue;
5146
5147 case ESC_V:
5148 (void)add_not_list_to_class(classbits, &class_uchardata, options,
5149 cd, PRIV(vspace_list));
5150 continue;
5151
5152 #ifdef SUPPORT_UCP
5153 case ESC_p:
5154 case ESC_P:
5155 {
5156 BOOL negated;
5157 unsigned int ptype = 0, pdata = 0;
5158 if (!get_ucp(&ptr, &negated, &ptype, &pdata, errorcodeptr))
5159 goto FAILED;
5160 *class_uchardata++ = ((escape == ESC_p) != negated)?
5161 XCL_PROP : XCL_NOTPROP;
5162 *class_uchardata++ = ptype;
5163 *class_uchardata++ = pdata;
5164 xclass_has_prop = TRUE;
5165 class_has_8bitchar--; /* Undo! */
5166 continue;
5167 }
5168 #endif
5169 /* Unrecognized escapes are faulted if PCRE is running in its
5170 strict mode. By default, for compatibility with Perl, they are
5171 treated as literals. */
5172
5173 default:
5174 if ((options & PCRE_EXTRA) != 0)
5175 {
5176 *errorcodeptr = ERR7;
5177 goto FAILED;
5178 }
5179 class_has_8bitchar--; /* Undo the speculative increase. */
5180 class_one_char -= 2; /* Undo the speculative increase. */
5181 c = *ptr; /* Get the final character and fall through */
5182 break;
5183 }
5184 }
5185
5186 /* Fall through if the escape just defined a single character (c >= 0).
5187 This may be greater than 256. */
5188
5189 escape = 0;
5190
5191 } /* End of backslash handling */
5192
5193 /* A character may be followed by '-' to form a range. However, Perl does
5194 not permit ']' to be the end of the range. A '-' character at the end is
5195 treated as a literal. Perl ignores orphaned \E sequences entirely. The
5196 code for handling \Q and \E is messy. */
5197
5198 CHECK_RANGE:
5199 while (ptr[1] == CHAR_BACKSLASH && ptr[2] == CHAR_E)
5200 {
5201 inescq = FALSE;
5202 ptr += 2;
5203 }
5204 oldptr = ptr;
5205
5206 /* Remember if \r or \n were explicitly used */
5207
5208 if (c == CHAR_CR || c == CHAR_NL) cd->external_flags |= PCRE_HASCRORLF;
5209
5210 /* Check for range */
5211
5212 if (!inescq && ptr[1] == CHAR_MINUS)
5213 {
5214 pcre_uint32 d;
5215 ptr += 2;
5216 while (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_E) ptr += 2;
5217
5218 /* If we hit \Q (not followed by \E) at this point, go into escaped
5219 mode. */
5220
5221 while (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_Q)
5222 {
5223 ptr += 2;
5224 if (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_E)
5225 { ptr += 2; continue; }
5226 inescq = TRUE;
5227 break;
5228 }
5229
5230 /* Minus (hyphen) at the end of a class is treated as a literal, so put
5231 back the pointer and jump to handle the character that preceded it. */
5232
5233 if (*ptr == CHAR_NULL || (!inescq && *ptr == CHAR_RIGHT_SQUARE_BRACKET))
5234 {
5235 ptr = oldptr;
5236 goto CLASS_SINGLE_CHARACTER;
5237 }
5238
5239 /* Otherwise, we have a potential range; pick up the next character */
5240
5241 #ifdef SUPPORT_UTF
5242 if (utf)
5243 { /* Braces are required because the */
5244 GETCHARLEN(d, ptr, ptr); /* macro generates multiple statements */
5245 }
5246 else
5247 #endif
5248 d = *ptr; /* Not UTF-8 mode */
5249
5250 /* The second part of a range can be a single-character escape
5251 sequence, but not any of the other escapes. Perl treats a hyphen as a
5252 literal in such circumstances. However, in Perl's warning mode, a
5253 warning is given, so PCRE now faults it as it is almost certainly a
5254 mistake on the user's part. */
5255
5256 if (!inescq)
5257 {
5258 if (d == CHAR_BACKSLASH)
5259 {
5260 int descape;
5261 descape = check_escape(&ptr, &d, errorcodeptr, cd->bracount, options, TRUE);
5262 if (*errorcodeptr != 0) goto FAILED;
5263
5264 /* 0 means a character was put into d; \b is backspace; any other
5265 special causes an error. */
5266
5267 if (descape != 0)
5268 {
5269 if (descape == ESC_b) d = CHAR_BS; else
5270 {
5271 *errorcodeptr = ERR83;
5272 goto FAILED;
5273 }
5274 }
5275 }
5276
5277 /* A hyphen followed by a POSIX class is treated in the same way. */
5278
5279 else if (d == CHAR_LEFT_SQUARE_BRACKET &&
5280 (ptr[1] == CHAR_COLON || ptr[1] == CHAR_DOT ||
5281 ptr[1] == CHAR_EQUALS_SIGN) &&
5282 check_posix_syntax(ptr, &tempptr))
5283 {
5284 *errorcodeptr = ERR83;
5285 goto FAILED;
5286 }
5287 }
5288
5289 /* Check that the two values are in the correct order. Optimize
5290 one-character ranges. */
5291
5292 if (d < c)
5293 {
5294 *errorcodeptr = ERR8;
5295 goto FAILED;
5296 }
5297 if (d == c) goto CLASS_SINGLE_CHARACTER; /* A few lines below */
5298
5299 /* We have found a character range, so single character optimizations
5300 cannot be done anymore. Any value greater than 1 indicates that there
5301 is more than one character. */
5302
5303 class_one_char = 2;
5304
5305 /* Remember an explicit \r or \n, and add the range to the class. */
5306
5307 if (d == CHAR_CR || d == CHAR_NL) cd->external_flags |= PCRE_HASCRORLF;
5308
5309 class_has_8bitchar +=
5310 add_to_class(classbits, &class_uchardata, options, cd, c, d);
5311
5312 continue; /* Go get the next char in the class */
5313 }
5314
5315 /* Handle a single character - we can get here for a normal non-escape
5316 char, or after \ that introduces a single character or for an apparent
5317 range that isn't. Only the value 1 matters for class_one_char, so don't
5318 increase it if it is already 2 or more ... just in case there's a class
5319 with a zillion characters in it. */
5320
5321 CLASS_SINGLE_CHARACTER:
5322 if (class_one_char < 2) class_one_char++;
5323
5324 /* If class_one_char is 1, we have the first single character in the
5325 class, and there have been no prior ranges, or XCLASS items generated by
5326 escapes. If this is the final character in the class, we can optimize by
5327 turning the item into a 1-character OP_CHAR[I] if it's positive, or
5328 OP_NOT[I] if it's negative. In the positive case, it can cause firstchar
5329 to be set. Otherwise, there can be no first char if this item is first,
5330 whatever repeat count may follow. In the case of reqchar, save the
5331 previous value for reinstating. */
5332
5333 if (!inescq && class_one_char == 1 && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
5334 {
5335 ptr++;
5336 zeroreqchar = reqchar;
5337 zeroreqcharflags = reqcharflags;
5338
5339 if (negate_class)
5340 {
5341 #ifdef SUPPORT_UCP
5342 int d;
5343 #endif
5344 if (firstcharflags == REQ_UNSET) firstcharflags = REQ_NONE;
5345 zerofirstchar = firstchar;
5346 zerofirstcharflags = firstcharflags;
5347
5348 /* For caseless UTF-8 mode when UCP support is available, check
5349 whether this character has more than one other case. If so, generate
5350 a special OP_NOTPROP item instead of OP_NOTI. */
5351
5352 #ifdef SUPPORT_UCP
5353 if (utf && (options & PCRE_CASELESS) != 0 &&
5354 (d = UCD_CASESET(c)) != 0)
5355 {
5356 *code++ = OP_NOTPROP;
5357 *code++ = PT_CLIST;
5358 *code++ = d;
5359 }
5360 else
5361 #endif
5362 /* Char has only one other case, or UCP not available */
5363
5364 {
5365 *code++ = ((options & PCRE_CASELESS) != 0)? OP_NOTI: OP_NOT;
5366 #if defined SUPPORT_UTF && !defined COMPILE_PCRE32
5367 if (utf && c > MAX_VALUE_FOR_SINGLE_CHAR)
5368 code += PRIV(ord2utf)(c, code);
5369 else
5370 #endif
5371 *code++ = c;
5372 }
5373
5374 /* We are finished with this character class */
5375
5376 goto END_CLASS;
5377 }
5378
5379 /* For a single, positive character, get the value into mcbuffer, and
5380 then we can handle this with the normal one-character code. */
5381
5382 #if defined SUPPORT_UTF && !defined COMPILE_PCRE32
5383 if (utf && c > MAX_VALUE_FOR_SINGLE_CHAR)
5384 mclength = PRIV(ord2utf)(c, mcbuffer);
5385 else
5386 #endif
5387 {
5388 mcbuffer[0] = c;
5389 mclength = 1;
5390 }
5391 goto ONE_CHAR;
5392 } /* End of 1-char optimization */
5393
5394 /* There is more than one character in the class, or an XCLASS item
5395 has been generated. Add this character to the class. */
5396
5397 class_has_8bitchar +=
5398 add_to_class(classbits, &class_uchardata, options, cd, c, c);
5399 }
5400
5401 /* Loop until ']' reached. This "while" is the end of the "do" far above.
5402 If we are at the end of an internal nested string, revert to the outer
5403 string. */
5404
5405 while (((c = *(++ptr)) != CHAR_NULL ||
5406 (nestptr != NULL &&
5407 (ptr = nestptr, nestptr = NULL, c = *(++ptr)) != CHAR_NULL)) &&
5408 (c != CHAR_RIGHT_SQUARE_BRACKET || inescq));
5409
5410 /* Check for missing terminating ']' */
5411
5412 if (c == CHAR_NULL)
5413 {
5414 *errorcodeptr = ERR6;
5415 goto FAILED;
5416 }
5417
5418 /* We will need an XCLASS if data has been placed in class_uchardata. In
5419 the second phase this is a sufficient test. However, in the pre-compile
5420 phase, class_uchardata gets emptied to prevent workspace overflow, so it
5421 only if the very last character in the class needs XCLASS will it contain
5422 anything at this point. For this reason, xclass gets set TRUE above when
5423 uchar_classdata is emptied, and that's why this code is the way it is here
5424 instead of just doing a test on class_uchardata below. */
5425
5426 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
5427 if (class_uchardata > class_uchardata_base) xclass = TRUE;
5428 #endif
5429
5430 /* If this is the first thing in the branch, there can be no first char
5431 setting, whatever the repeat count. Any reqchar setting must remain
5432 unchanged after any kind of repeat. */
5433
5434 if (firstcharflags == REQ_UNSET) firstcharflags = REQ_NONE;
5435 zerofirstchar = firstchar;
5436 zerofirstcharflags = firstcharflags;
5437 zeroreqchar = reqchar;
5438 zeroreqcharflags = reqcharflags;
5439
5440 /* If there are characters with values > 255, we have to compile an
5441 extended class, with its own opcode, unless there was a negated special
5442 such as \S in the class, and PCRE_UCP is not set, because in that case all
5443 characters > 255 are in the class, so any that were explicitly given as
5444 well can be ignored. If (when there are explicit characters > 255 that must
5445 be listed) there are no characters < 256, we can omit the bitmap in the
5446 actual compiled code. */
5447
5448 #ifdef SUPPORT_UTF
5449 if (xclass && (!should_flip_negation || (options & PCRE_UCP) != 0))
5450 #elif !defined COMPILE_PCRE8
5451 if (xclass && !should_flip_negation)
5452 #endif
5453 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
5454 {
5455 *class_uchardata++ = XCL_END; /* Marks the end of extra data */
5456 *code++ = OP_XCLASS;
5457 code += LINK_SIZE;
5458 *code = negate_class? XCL_NOT:0;
5459 if (xclass_has_prop) *code |= XCL_HASPROP;
5460
5461 /* If the map is required, move up the extra data to make room for it;
5462 otherwise just move the code pointer to the end of the extra data. */
5463
5464 if (class_has_8bitchar > 0)
5465 {
5466 *code++ |= XCL_MAP;
5467 memmove(code + (32 / sizeof(pcre_uchar)), code,
5468 IN_UCHARS(class_uchardata - code));
5469 if (negate_class && !xclass_has_prop)
5470 for (c = 0; c < 32; c++) classbits[c] = ~classbits[c];
5471 memcpy(code, classbits, 32);
5472 code = class_uchardata + (32 / sizeof(pcre_uchar));
5473 }
5474 else code = class_uchardata;
5475
5476 /* Now fill in the complete length of the item */
5477
5478 PUT(previous, 1, (int)(code - previous));
5479 break; /* End of class handling */
5480 }
5481 #endif
5482
5483 /* If there are no characters > 255, or they are all to be included or
5484 excluded, set the opcode to OP_CLASS or OP_NCLASS, depending on whether the
5485 whole class was negated and whether there were negative specials such as \S
5486 (non-UCP) in the class. Then copy the 32-byte map into the code vector,
5487 negating it if necessary. */
5488
5489 *code++ = (negate_class == should_flip_negation) ? OP_CLASS : OP_NCLASS;
5490 if (lengthptr == NULL) /* Save time in the pre-compile phase */
5491 {
5492 if (negate_class)
5493 for (c = 0; c < 32; c++) classbits[c] = ~classbits[c];
5494 memcpy(code, classbits, 32);
5495 }
5496 code += 32 / sizeof(pcre_uchar);
5497
5498 END_CLASS:
5499 break;
5500
5501
5502 /* ===================================================================*/
5503 /* Various kinds of repeat; '{' is not necessarily a quantifier, but this
5504 has been tested above. */
5505
5506 case CHAR_LEFT_CURLY_BRACKET:
5507 if (!is_quantifier) goto NORMAL_CHAR;
5508 ptr = read_repeat_counts(ptr+1, &repeat_min, &repeat_max, errorcodeptr);
5509 if (*errorcodeptr != 0) goto FAILED;
5510 goto REPEAT;
5511
5512 case CHAR_ASTERISK:
5513 repeat_min = 0;
5514 repeat_max = -1;
5515 goto REPEAT;
5516
5517 case CHAR_PLUS:
5518 repeat_min = 1;
5519 repeat_max = -1;
5520 goto REPEAT;
5521
5522 case CHAR_QUESTION_MARK:
5523 repeat_min = 0;
5524 repeat_max = 1;
5525
5526 REPEAT:
5527 if (previous == NULL)
5528 {
5529 *errorcodeptr = ERR9;
5530 goto FAILED;
5531 }
5532
5533 if (repeat_min == 0)
5534 {
5535 firstchar = zerofirstchar; /* Adjust for zero repeat */
5536 firstcharflags = zerofirstcharflags;
5537 reqchar = zeroreqchar; /* Ditto */
5538 reqcharflags = zeroreqcharflags;
5539 }
5540
5541 /* Remember whether this is a variable length repeat */
5542
5543 reqvary = (repeat_min == repeat_max)? 0 : REQ_VARY;
5544
5545 op_type = 0; /* Default single-char op codes */
5546 possessive_quantifier = FALSE; /* Default not possessive quantifier */
5547
5548 /* Save start of previous item, in case we have to move it up in order to
5549 insert something before it. */
5550
5551 tempcode = previous;
5552
5553 /* Before checking for a possessive quantifier, we must skip over
5554 whitespace and comments in extended mode because Perl allows white space at
5555 this point. */
5556
5557 if ((options & PCRE_EXTENDED) != 0)
5558 {
5559 const pcre_uchar *p = ptr + 1;
5560 for (;;)
5561 {
5562 while (MAX_255(*p) && (cd->ctypes[*p] & ctype_space) != 0) p++;
5563 if (*p != CHAR_NUMBER_SIGN) break;
5564 p++;
5565 while (*p != CHAR_NULL)
5566 {
5567 if (IS_NEWLINE(p)) /* For non-fixed-length newline cases, */
5568 { /* IS_NEWLINE sets cd->nllen. */
5569 p += cd->nllen;
5570 break;
5571 }
5572 p++;
5573 #ifdef SUPPORT_UTF
5574 if (utf) FORWARDCHAR(p);
5575 #endif
5576 } /* Loop for comment characters */
5577 } /* Loop for multiple comments */
5578 ptr = p - 1; /* Character before the next significant one. */
5579 }
5580
5581 /* If the next character is '+', we have a possessive quantifier. This
5582 implies greediness, whatever the setting of the PCRE_UNGREEDY option.
5583 If the next character is '?' this is a minimizing repeat, by default,
5584 but if PCRE_UNGREEDY is set, it works the other way round. We change the
5585 repeat type to the non-default. */
5586
5587 if (ptr[1] == CHAR_PLUS)
5588 {
5589 repeat_type = 0; /* Force greedy */
5590 possessive_quantifier = TRUE;
5591 ptr++;
5592 }
5593 else if (ptr[1] == CHAR_QUESTION_MARK)
5594 {
5595 repeat_type = greedy_non_default;
5596 ptr++;
5597 }
5598 else repeat_type = greedy_default;
5599
5600 /* If previous was a recursion call, wrap it in atomic brackets so that
5601 previous becomes the atomic group. All recursions were so wrapped in the
5602 past, but it no longer happens for non-repeated recursions. In fact, the
5603 repeated ones could be re-implemented independently so as not to need this,
5604 but for the moment we rely on the code for repeating groups. */
5605
5606 if (*previous == OP_RECURSE)
5607 {
5608 memmove(previous + 1 + LINK_SIZE, previous, IN_UCHARS(1 + LINK_SIZE));
5609 *previous = OP_ONCE;
5610 PUT(previous, 1, 2 + 2*LINK_SIZE);
5611 previous[2 + 2*LINK_SIZE] = OP_KET;
5612 PUT(previous, 3 + 2*LINK_SIZE, 2 + 2*LINK_SIZE);
5613 code += 2 + 2 * LINK_SIZE;
5614 length_prevgroup = 3 + 3*LINK_SIZE;
5615
5616 /* When actually compiling, we need to check whether this was a forward
5617 reference, and if so, adjust the offset. */
5618
5619 if (lengthptr == NULL && cd->hwm >= cd->start_workspace + LINK_SIZE)
5620 {
5621 int offset = GET(cd->hwm, -LINK_SIZE);
5622 if (offset == previous + 1 - cd->start_code)
5623 PUT(cd->hwm, -LINK_SIZE, offset + 1 + LINK_SIZE);
5624 }
5625 }
5626
5627 /* Now handle repetition for the different types of item. */
5628
5629 /* If previous was a character or negated character match, abolish the item
5630 and generate a repeat item instead. If a char item has a minimum of more
5631 than one, ensure that it is set in reqchar - it might not be if a sequence
5632 such as x{3} is the first thing in a branch because the x will have gone
5633 into firstchar instead. */
5634
5635 if (*previous == OP_CHAR || *previous == OP_CHARI
5636 || *previous == OP_NOT || *previous == OP_NOTI)
5637 {
5638 switch (*previous)
5639 {
5640 default: /* Make compiler happy. */
5641 case OP_CHAR: op_type = OP_STAR - OP_STAR; break;
5642 case OP_CHARI: op_type = OP_STARI - OP_STAR; break;
5643 case OP_NOT: op_type = OP_NOTSTAR - OP_STAR; break;
5644 case OP_NOTI: op_type = OP_NOTSTARI - OP_STAR; break;
5645 }
5646
5647 /* Deal with UTF characters that take up more than one character. It's
5648 easier to write this out separately than try to macrify it. Use c to
5649 hold the length of the character in bytes, plus UTF_LENGTH to flag that
5650 it's a length rather than a small character. */
5651
5652 #if defined SUPPORT_UTF && !defined COMPILE_PCRE32
5653 if (utf && NOT_FIRSTCHAR(code[-1]))
5654 {
5655 pcre_uchar *lastchar = code - 1;
5656 BACKCHAR(lastchar);
5657 c = (int)(code - lastchar); /* Length of UTF-8 character */
5658 memcpy(utf_chars, lastchar, IN_UCHARS(c)); /* Save the char */
5659 c |= UTF_LENGTH; /* Flag c as a length */
5660 }
5661 else
5662 #endif /* SUPPORT_UTF */
5663
5664 /* Handle the case of a single charater - either with no UTF support, or
5665 with UTF disabled, or for a single character UTF character. */
5666 {
5667 c = code[-1];
5668 if (*previous <= OP_CHARI && repeat_min > 1)
5669 {
5670 reqchar = c;
5671 reqcharflags = req_caseopt | cd->req_varyopt;
5672 }
5673 }
5674
5675 goto OUTPUT_SINGLE_REPEAT; /* Code shared with single character types */
5676 }
5677
5678 /* If previous was a character type match (\d or similar), abolish it and
5679 create a suitable repeat item. The code is shared with single-character
5680 repeats by setting op_type to add a suitable offset into repeat_type. Note
5681 the the Unicode property types will be present only when SUPPORT_UCP is
5682 defined, but we don't wrap the little bits of code here because it just
5683 makes it horribly messy. */
5684
5685 else if (*previous < OP_EODN)
5686 {
5687 pcre_uchar *oldcode;
5688 int prop_type, prop_value;
5689 op_type = OP_TYPESTAR - OP_STAR; /* Use type opcodes */
5690 c = *previous;
5691
5692 OUTPUT_SINGLE_REPEAT:
5693 if (*previous == OP_PROP || *previous == OP_NOTPROP)
5694 {
5695 prop_type = previous[1];
5696 prop_value = previous[2];
5697 }
5698 else prop_type = prop_value = -1;
5699
5700 oldcode = code;
5701 code = previous; /* Usually overwrite previous item */
5702
5703 /* If the maximum is zero then the minimum must also be zero; Perl allows
5704 this case, so we do too - by simply omitting the item altogether. */
5705
5706 if (repeat_max == 0) goto END_REPEAT;
5707
5708 /* Combine the op_type with the repeat_type */
5709
5710 repeat_type += op_type;
5711
5712 /* A minimum of zero is handled either as the special case * or ?, or as
5713 an UPTO, with the maximum given. */
5714
5715 if (repeat_min == 0)
5716 {
5717 if (repeat_max == -1) *code++ = OP_STAR + repeat_type;
5718 else if (repeat_max == 1) *code++ = OP_QUERY + repeat_type;
5719 else
5720 {
5721 *code++ = OP_UPTO + repeat_type;
5722 PUT2INC(code, 0, repeat_max);
5723 }
5724 }
5725
5726 /* A repeat minimum of 1 is optimized into some special cases. If the
5727 maximum is unlimited, we use OP_PLUS. Otherwise, the original item is
5728 left in place and, if the maximum is greater than 1, we use OP_UPTO with
5729 one less than the maximum. */
5730
5731 else if (repeat_min == 1)
5732 {
5733 if (repeat_max == -1)
5734 *code++ = OP_PLUS + repeat_type;
5735 else
5736 {
5737 code = oldcode; /* leave previous item in place */
5738 if (repeat_max == 1) goto END_REPEAT;
5739 *code++ = OP_UPTO + repeat_type;
5740 PUT2INC(code, 0, repeat_max - 1);
5741 }
5742 }
5743
5744 /* The case {n,n} is just an EXACT, while the general case {n,m} is
5745 handled as an EXACT followed by an UPTO. */
5746
5747 else
5748 {
5749 *code++ = OP_EXACT + op_type; /* NB EXACT doesn't have repeat_type */
5750 PUT2INC(code, 0, repeat_min);
5751
5752 /* If the maximum is unlimited, insert an OP_STAR. Before doing so,
5753 we have to insert the character for the previous code. For a repeated
5754 Unicode property match, there are two extra bytes that define the
5755 required property. In UTF-8 mode, long characters have their length in
5756 c, with the UTF_LENGTH bit as a flag. */
5757
5758 if (repeat_max < 0)
5759 {
5760 #if defined SUPPORT_UTF && !defined COMPILE_PCRE32
5761 if (utf && (c & UTF_LENGTH) != 0)
5762 {
5763 memcpy(code, utf_chars, IN_UCHARS(c & 7));
5764 code += c & 7;
5765 }
5766 else
5767 #endif
5768 {
5769 *code++ = c;
5770 if (prop_type >= 0)
5771 {
5772 *code++ = prop_type;
5773 *code++ = prop_value;
5774 }
5775 }
5776 *code++ = OP_STAR + repeat_type;
5777 }
5778
5779 /* Else insert an UPTO if the max is greater than the min, again
5780 preceded by the character, for the previously inserted code. If the
5781 UPTO is just for 1 instance, we can use QUERY instead. */
5782
5783 else if (repeat_max != repeat_min)
5784 {
5785 #if defined SUPPORT_UTF && !defined COMPILE_PCRE32
5786 if (utf && (c & UTF_LENGTH) != 0)
5787 {
5788 memcpy(code, utf_chars, IN_UCHARS(c & 7));
5789 code += c & 7;
5790 }
5791 else
5792 #endif
5793 *code++ = c;
5794 if (prop_type >= 0)
5795 {
5796 *code++ = prop_type;
5797 *code++ = prop_value;
5798 }
5799 repeat_max -= repeat_min;
5800
5801 if (repeat_max == 1)
5802 {
5803 *code++ = OP_QUERY + repeat_type;
5804 }
5805 else
5806 {
5807 *code++ = OP_UPTO + repeat_type;
5808 PUT2INC(code, 0, repeat_max);
5809 }
5810 }
5811 }
5812
5813 /* The character or character type itself comes last in all cases. */
5814
5815 #if defined SUPPORT_UTF && !defined COMPILE_PCRE32
5816 if (utf && (c & UTF_LENGTH) != 0)
5817 {
5818 memcpy(code, utf_chars, IN_UCHARS(c & 7));
5819 code += c & 7;
5820 }
5821 else
5822 #endif
5823 *code++ = c;
5824
5825 /* For a repeated Unicode property match, there are two extra bytes that
5826 define the required property. */
5827
5828 #ifdef SUPPORT_UCP
5829 if (prop_type >= 0)
5830 {
5831 *code++ = prop_type;
5832 *code++ = prop_value;
5833 }
5834 #endif
5835 }
5836
5837 /* If previous was a character class or a back reference, we put the repeat
5838 stuff after it, but just skip the item if the repeat was {0,0}. */
5839
5840 else if (*previous == OP_CLASS || *previous == OP_NCLASS ||
5841 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
5842 *previous == OP_XCLASS ||
5843 #endif
5844 *previous == OP_REF || *previous == OP_REFI ||
5845 *previous == OP_DNREF || *previous == OP_DNREFI)
5846 {
5847 if (repeat_max == 0)
5848 {
5849 code = previous;
5850 goto END_REPEAT;
5851 }
5852
5853 if (repeat_min == 0 && repeat_max == -1)
5854 *code++ = OP_CRSTAR + repeat_type;
5855 else if (repeat_min == 1 && repeat_max == -1)
5856 *code++ = OP_CRPLUS + repeat_type;
5857 else if (repeat_min == 0 && repeat_max == 1)
5858 *code++ = OP_CRQUERY + repeat_type;
5859 else
5860 {
5861 *code++ = OP_CRRANGE + repeat_type;
5862 PUT2INC(code, 0, repeat_min);
5863 if (repeat_max == -1) repeat_max = 0; /* 2-byte encoding for max */
5864 PUT2INC(code, 0, repeat_max);
5865 }
5866 }
5867
5868 /* If previous was a bracket group, we may have to replicate it in certain
5869 cases. Note that at this point we can encounter only the "basic" bracket
5870 opcodes such as BRA and CBRA, as this is the place where they get converted
5871 into the more special varieties such as BRAPOS and SBRA. A test for >=
5872 OP_ASSERT and <= OP_COND includes ASSERT, ASSERT_NOT, ASSERTBACK,
5873 ASSERTBACK_NOT, ONCE, ONCE_NC, BRA, BRAPOS, CBRA, CBRAPOS, and COND.
5874 Originally, PCRE did not allow repetition of assertions, but now it does,
5875 for Perl compatibility. */
5876
5877 else if (*previous >= OP_ASSERT && *previous <= OP_COND)
5878 {
5879 register int i;
5880 int len = (int)(code - previous);
5881 pcre_uchar *bralink = NULL;
5882 pcre_uchar *brazeroptr = NULL;
5883
5884 /* Repeating a DEFINE group is pointless, but Perl allows the syntax, so
5885 we just ignore the repeat. */
5886
5887 if (*previous == OP_COND && previous[LINK_SIZE+1] == OP_DEF)
5888 goto END_REPEAT;
5889
5890 /* There is no sense in actually repeating assertions. The only potential
5891 use of repetition is in cases when the assertion is optional. Therefore,
5892 if the minimum is greater than zero, just ignore the repeat. If the
5893 maximum is not zero or one, set it to 1. */
5894
5895 if (*previous < OP_ONCE) /* Assertion */
5896 {
5897 if (repeat_min > 0) goto END_REPEAT;
5898 if (repeat_max < 0 || repeat_max > 1) repeat_max = 1;
5899 }
5900
5901 /* The case of a zero minimum is special because of the need to stick
5902 OP_BRAZERO in front of it, and because the group appears once in the
5903 data, whereas in other cases it appears the minimum number of times. For
5904 this reason, it is simplest to treat this case separately, as otherwise
5905 the code gets far too messy. There are several special subcases when the
5906 minimum is zero. */
5907
5908 if (repeat_min == 0)
5909 {
5910 /* If the maximum is also zero, we used to just omit the group from the
5911 output altogether, like this:
5912
5913 ** if (repeat_max == 0)
5914 ** {
5915 ** code = previous;
5916 ** goto END_REPEAT;
5917 ** }
5918
5919 However, that fails when a group or a subgroup within it is referenced
5920 as a subroutine from elsewhere in the pattern, so now we stick in
5921 OP_SKIPZERO in front of it so that it is skipped on execution. As we
5922 don't have a list of which groups are referenced, we cannot do this
5923 selectively.
5924
5925 If the maximum is 1 or unlimited, we just have to stick in the BRAZERO
5926 and do no more at this point. However, we do need to adjust any
5927 OP_RECURSE calls inside the group that refer to the group itself or any
5928 internal or forward referenced group, because the offset is from the
5929 start of the whole regex. Temporarily terminate the pattern while doing
5930 this. */
5931
5932 if (repeat_max <= 1) /* Covers 0, 1, and unlimited */
5933 {
5934 *code = OP_END;
5935 adjust_recurse(previous, 1, utf, cd, save_hwm);
5936 memmove(previous + 1, previous, IN_UCHARS(len));
5937 code++;
5938 if (repeat_max == 0)
5939 {
5940 *previous++ = OP_SKIPZERO;
5941 goto END_REPEAT;
5942 }
5943 brazeroptr = previous; /* Save for possessive optimizing */
5944 *previous++ = OP_BRAZERO + repeat_type;
5945 }
5946
5947 /* If the maximum is greater than 1 and limited, we have to replicate
5948 in a nested fashion, sticking OP_BRAZERO before each set of brackets.
5949 The first one has to be handled carefully because it's the original
5950 copy, which has to be moved up. The remainder can be handled by code
5951 that is common with the non-zero minimum case below. We have to
5952 adjust the value or repeat_max, since one less copy is required. Once
5953 again, we may have to adjust any OP_RECURSE calls inside the group. */
5954
5955 else
5956 {
5957 int offset;
5958 *code = OP_END;
5959 adjust_recurse(previous, 2 + LINK_SIZE, utf, cd, save_hwm);
5960 memmove(previous + 2 + LINK_SIZE, previous, IN_UCHARS(len));
5961 code += 2 + LINK_SIZE;
5962 *previous++ = OP_BRAZERO + repeat_type;
5963 *previous++ = OP_BRA;
5964
5965 /* We chain together the bracket offset fields that have to be
5966 filled in later when the ends of the brackets are reached. */
5967
5968 offset = (bralink == NULL)? 0 : (int)(previous - bralink);
5969 bralink = previous;
5970 PUTINC(previous, 0, offset);
5971 }
5972
5973 repeat_max--;
5974 }
5975
5976 /* If the minimum is greater than zero, replicate the group as many
5977 times as necessary, and adjust the maximum to the number of subsequent
5978 copies that we need. If we set a first char from the group, and didn't
5979 set a required char, copy the latter from the former. If there are any
5980 forward reference subroutine calls in the group, there will be entries on
5981 the workspace list; replicate these with an appropriate increment. */
5982
5983 else
5984 {
5985 if (repeat_min > 1)
5986 {
5987 /* In the pre-compile phase, we don't actually do the replication. We
5988 just adjust the length as if we had. Do some paranoid checks for
5989 potential integer overflow. The INT64_OR_DOUBLE type is a 64-bit
5990 integer type when available, otherwise double. */
5991
5992 if (lengthptr != NULL)
5993 {
5994 int delta = (repeat_min - 1)*length_prevgroup;
5995 if ((INT64_OR_DOUBLE)(repeat_min - 1)*
5996 (INT64_OR_DOUBLE)length_prevgroup >
5997 (INT64_OR_DOUBLE)INT_MAX ||
5998 OFLOW_MAX - *lengthptr < delta)
5999 {
6000 *errorcodeptr = ERR20;
6001 goto FAILED;
6002 }
6003 *lengthptr += delta;
6004 }
6005
6006 /* This is compiling for real. If there is a set first byte for
6007 the group, and we have not yet set a "required byte", set it. Make
6008 sure there is enough workspace for copying forward references before
6009 doing the copy. */
6010
6011 else
6012 {
6013 if (groupsetfirstchar && reqcharflags < 0)
6014 {
6015 reqchar = firstchar;
6016 reqcharflags = firstcharflags;
6017 }
6018
6019 for (i = 1; i < repeat_min; i++)
6020 {
6021 pcre_uchar *hc;
6022 pcre_uchar *this_hwm = cd->hwm;
6023 memcpy(code, previous, IN_UCHARS(len));
6024
6025 while (cd->hwm > cd->start_workspace + cd->workspace_size -
6026 WORK_SIZE_SAFETY_MARGIN - (this_hwm - save_hwm))
6027 {
6028 size_t save_offset = save_hwm - cd->start_workspace;
6029 size_t this_offset = this_hwm - cd->start_workspace;
6030 *errorcodeptr = expand_workspace(cd);
6031 if (*errorcodeptr != 0) goto FAILED;
6032 save_hwm = (pcre_uchar *)cd->start_workspace + save_offset;
6033 this_hwm = (pcre_uchar *)cd->start_workspace + this_offset;
6034 }
6035
6036 for (hc = save_hwm; hc < this_hwm; hc += LINK_SIZE)
6037 {
6038 PUT(cd->hwm, 0, GET(hc, 0) + len);
6039 cd->hwm += LINK_SIZE;
6040 }
6041 save_hwm = this_hwm;
6042 code += len;
6043 }
6044 }
6045 }
6046
6047 if (repeat_max > 0) repeat_max -= repeat_min;
6048 }
6049
6050 /* This code is common to both the zero and non-zero minimum cases. If
6051 the maximum is limited, it replicates the group in a nested fashion,
6052 remembering the bracket starts on a stack. In the case of a zero minimum,
6053 the first one was set up above. In all cases the repeat_max now specifies
6054 the number of additional copies needed. Again, we must remember to
6055 replicate entries on the forward reference list. */
6056
6057 if (repeat_max >= 0)
6058 {
6059 /* In the pre-compile phase, we don't actually do the replication. We
6060 just adjust the length as if we had. For each repetition we must add 1
6061 to the length for BRAZERO and for all but the last repetition we must
6062 add 2 + 2*LINKSIZE to allow for the nesting that occurs. Do some
6063 paranoid checks to avoid integer overflow. The INT64_OR_DOUBLE type is
6064 a 64-bit integer type when available, otherwise double. */
6065
6066 if (lengthptr != NULL && repeat_max > 0)
6067 {
6068 int delta = repeat_max * (length_prevgroup + 1 + 2 + 2*LINK_SIZE) -
6069 2 - 2*LINK_SIZE; /* Last one doesn't nest */
6070 if ((INT64_OR_DOUBLE)repeat_max *
6071 (INT64_OR_DOUBLE)(length_prevgroup + 1 + 2 + 2*LINK_SIZE)
6072 > (INT64_OR_DOUBLE)INT_MAX ||
6073 OFLOW_MAX - *lengthptr < delta)
6074 {
6075 *errorcodeptr = ERR20;
6076 goto FAILED;
6077 }
6078 *lengthptr += delta;
6079 }
6080
6081 /* This is compiling for real */
6082
6083 else for (i = repeat_max - 1; i >= 0; i--)
6084 {
6085 pcre_uchar *hc;
6086 pcre_uchar *this_hwm = cd->hwm;
6087
6088 *code++ = OP_BRAZERO + repeat_type;
6089
6090 /* All but the final copy start a new nesting, maintaining the
6091 chain of brackets outstanding. */
6092
6093 if (i != 0)
6094 {
6095 int offset;
6096 *code++ = OP_BRA;
6097 offset = (bralink == NULL)? 0 : (int)(code - bralink);
6098 bralink = code;
6099 PUTINC(code, 0, offset);
6100 }
6101
6102 memcpy(code, previous, IN_UCHARS(len));
6103
6104 /* Ensure there is enough workspace for forward references before
6105 copying them. */
6106
6107 while (cd->hwm > cd->start_workspace + cd->workspace_size -
6108 WORK_SIZE_SAFETY_MARGIN - (this_hwm - save_hwm))
6109 {
6110 size_t save_offset = save_hwm - cd->start_workspace;
6111 size_t this_offset = this_hwm - cd->start_workspace;
6112 *errorcodeptr = expand_workspace(cd);
6113 if (*errorcodeptr != 0) goto FAILED;
6114 save_hwm = (pcre_uchar *)cd->start_workspace + save_offset;
6115 this_hwm = (pcre_uchar *)cd->start_workspace + this_offset;
6116 }
6117
6118 for (hc = save_hwm; hc < this_hwm; hc += LINK_SIZE)
6119 {
6120 PUT(cd->hwm, 0, GET(hc, 0) + len + ((i != 0)? 2+LINK_SIZE : 1));
6121 cd->hwm += LINK_SIZE;
6122 }
6123 save_hwm = this_hwm;
6124 code += len;
6125 }
6126
6127 /* Now chain through the pending brackets, and fill in their length
6128 fields (which are holding the chain links pro tem). */
6129
6130 while (bralink != NULL)
6131 {
6132 int oldlinkoffset;
6133 int offset = (int)(code - bralink + 1);
6134 pcre_uchar *bra = code - offset;
6135 oldlinkoffset = GET(bra, 1);
6136 bralink = (oldlinkoffset == 0)? NULL : bralink - oldlinkoffset;
6137 *code++ = OP_KET;
6138 PUTINC(code, 0, offset);
6139 PUT(bra, 1, offset);
6140 }
6141 }
6142
6143 /* If the maximum is unlimited, set a repeater in the final copy. For
6144 ONCE brackets, that's all we need to do. However, possessively repeated
6145 ONCE brackets can be converted into non-capturing brackets, as the
6146 behaviour of (?:xx)++ is the same as (?>xx)++ and this saves having to
6147 deal with possessive ONCEs specially.
6148
6149 Otherwise, when we are doing the actual compile phase, check to see
6150 whether this group is one that could match an empty string. If so,
6151 convert the initial operator to the S form (e.g. OP_BRA -> OP_SBRA) so
6152 that runtime checking can be done. [This check is also applied to ONCE
6153 groups at runtime, but in a different way.]
6154
6155 Then, if the quantifier was possessive and the bracket is not a
6156 conditional, we convert the BRA code to the POS form, and the KET code to
6157 KETRPOS. (It turns out to be convenient at runtime to detect this kind of
6158 subpattern at both the start and at the end.) The use of special opcodes
6159 makes it possible to reduce greatly the stack usage in pcre_exec(). If
6160 the group is preceded by OP_BRAZERO, convert this to OP_BRAPOSZERO.
6161
6162 Then, if the minimum number of matches is 1 or 0, cancel the possessive
6163 flag so that the default action below, of wrapping everything inside
6164 atomic brackets, does not happen. When the minimum is greater than 1,
6165 there will be earlier copies of the group, and so we still have to wrap
6166 the whole thing. */
6167
6168 else
6169 {
6170 pcre_uchar *ketcode = code - 1 - LINK_SIZE;
6171 pcre_uchar *bracode = ketcode - GET(ketcode, 1);
6172
6173 /* Convert possessive ONCE brackets to non-capturing */
6174
6175 if ((*bracode == OP_ONCE || *bracode == OP_ONCE_NC) &&
6176 possessive_quantifier) *bracode = OP_BRA;
6177
6178 /* For non-possessive ONCE brackets, all we need to do is to
6179 set the KET. */
6180
6181 if (*bracode == OP_ONCE || *bracode == OP_ONCE_NC)
6182 *ketcode = OP_KETRMAX + repeat_type;
6183
6184 /* Handle non-ONCE brackets and possessive ONCEs (which have been
6185 converted to non-capturing above). */
6186
6187 else
6188 {
6189 /* In the compile phase, check for empty string matching. */
6190
6191 if (lengthptr == NULL)
6192 {
6193 pcre_uchar *scode = bracode;
6194 do
6195 {
6196 if (could_be_empty_branch(scode, ketcode, utf, cd, NULL))
6197 {
6198 *bracode += OP_SBRA - OP_BRA;
6199 break;
6200 }
6201 scode += GET(scode, 1);
6202 }
6203 while (*scode == OP_ALT);
6204 }
6205
6206 /* Handle possessive quantifiers. */
6207
6208 if (possessive_quantifier)
6209 {
6210 /* For COND brackets, we wrap the whole thing in a possessively
6211 repeated non-capturing bracket, because we have not invented POS
6212 versions of the COND opcodes. Because we are moving code along, we
6213 must ensure that any pending recursive references are updated. */
6214
6215 if (*bracode == OP_COND || *bracode == OP_SCOND)
6216 {
6217 int nlen = (int)(code - bracode);
6218 *code = OP_END;
6219 adjust_recurse(bracode, 1 + LINK_SIZE, utf, cd, save_hwm);
6220 memmove(bracode + 1 + LINK_SIZE, bracode, IN_UCHARS(nlen));
6221 code += 1 + LINK_SIZE;
6222 nlen += 1 + LINK_SIZE;
6223 *bracode = OP_BRAPOS;
6224 *code++ = OP_KETRPOS;
6225 PUTINC(code, 0, nlen);
6226 PUT(bracode, 1, nlen);
6227 }
6228
6229 /* For non-COND brackets, we modify the BRA code and use KETRPOS. */
6230
6231 else
6232 {
6233 *bracode += 1; /* Switch to xxxPOS opcodes */
6234 *ketcode = OP_KETRPOS;
6235 }
6236
6237 /* If the minimum is zero, mark it as possessive, then unset the
6238 possessive flag when the minimum is 0 or 1. */
6239
6240 if (brazeroptr != NULL) *brazeroptr = OP_BRAPOSZERO;
6241 if (repeat_min < 2) possessive_quantifier = FALSE;
6242 }
6243
6244 /* Non-possessive quantifier */
6245
6246 else *ketcode = OP_KETRMAX + repeat_type;
6247 }
6248 }
6249 }
6250
6251 /* If previous is OP_FAIL, it was generated by an empty class [] in
6252 JavaScript mode. The other ways in which OP_FAIL can be generated, that is
6253 by (*FAIL) or (?!) set previous to NULL, which gives a "nothing to repeat"
6254 error above. We can just ignore the repeat in JS case. */
6255
6256 else if (*previous == OP_FAIL) goto END_REPEAT;
6257
6258 /* Else there's some kind of shambles */
6259
6260 else
6261 {
6262 *errorcodeptr = ERR11;
6263 goto FAILED;
6264 }
6265
6266 /* If the character following a repeat is '+', possessive_quantifier is
6267 TRUE. For some opcodes, there are special alternative opcodes for this
6268 case. For anything else, we wrap the entire repeated item inside OP_ONCE
6269 brackets. Logically, the '+' notation is just syntactic sugar, taken from
6270 Sun's Java package, but the special opcodes can optimize it.
6271
6272 Some (but not all) possessively repeated subpatterns have already been
6273 completely handled in the code just above. For them, possessive_quantifier
6274 is always FALSE at this stage. Note that the repeated item starts at
6275 tempcode, not at previous, which might be the first part of a string whose
6276 (former) last char we repeated. */
6277
6278 if (possessive_quantifier)
6279 {
6280 int len;
6281
6282 /* Possessifying an EXACT quantifier has no effect, so we can ignore it.
6283 However, QUERY, STAR, or UPTO may follow (for quantifiers such as {5,6},
6284 {5,}, or {5,10}). We skip over an EXACT item; if the length of what
6285 remains is greater than zero, there's a further opcode that can be
6286 handled. If not, do nothing, leaving the EXACT alone. */
6287
6288 switch(*tempcode)
6289 {
6290 case OP_TYPEEXACT:
6291 tempcode += PRIV(OP_lengths)[*tempcode] +
6292 ((tempcode[1 + IMM2_SIZE] == OP_PROP
6293 || tempcode[1 + IMM2_SIZE] == OP_NOTPROP)? 2 : 0);
6294 break;
6295
6296 /* CHAR opcodes are used for exacts whose count is 1. */
6297
6298 case OP_CHAR:
6299 case OP_CHARI:
6300 case OP_NOT:
6301 case OP_NOTI:
6302 case OP_EXACT:
6303 case OP_EXACTI:
6304 case OP_NOTEXACT:
6305 case OP_NOTEXACTI:
6306 tempcode += PRIV(OP_lengths)[*tempcode];
6307 #ifdef SUPPORT_UTF
6308 if (utf && HAS_EXTRALEN(tempcode[-1]))
6309 tempcode += GET_EXTRALEN(tempcode[-1]);
6310 #endif
6311 break;
6312
6313 /* For the class opcodes, the repeat operator appears at the end;
6314 adjust tempcode to point to it. */
6315
6316 case OP_CLASS:
6317 case OP_NCLASS:
6318 tempcode += 1 + 32/sizeof(pcre_uchar);
6319 break;
6320
6321 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
6322 case OP_XCLASS:
6323 tempcode += GET(tempcode, 1);
6324 break;
6325 #endif
6326 }
6327
6328 /* If tempcode is equal to code (which points to the end of the repeated
6329 item), it means we have skipped an EXACT item but there is no following
6330 QUERY, STAR, or UPTO; the value of len will be 0, and we do nothing. In
6331 all other cases, tempcode will be pointing to the repeat opcode, and will
6332 be less than code, so the value of len will be greater than 0. */
6333
6334 len = (int)(code - tempcode);
6335 if (len > 0)
6336 {
6337 unsigned int repcode = *tempcode;
6338
6339 /* There is a table for possessifying opcodes, all of which are less
6340 than OP_CALLOUT. A zero entry means there is no possessified version.
6341 */
6342
6343 if (repcode < OP_CALLOUT && opcode_possessify[repcode] > 0)
6344 *tempcode = opcode_possessify[repcode];
6345
6346 /* For opcode without a special possessified version, wrap the item in
6347 ONCE brackets. Because we are moving code along, we must ensure that any
6348 pending recursive references are updated. */
6349
6350 else
6351 {
6352 *code = OP_END;
6353 adjust_recurse(tempcode, 1 + LINK_SIZE, utf, cd, save_hwm);
6354 memmove(tempcode + 1 + LINK_SIZE, tempcode, IN_UCHARS(len));
6355 code += 1 + LINK_SIZE;
6356 len += 1 + LINK_SIZE;
6357 tempcode[0] = OP_ONCE;
6358 *code++ = OP_KET;
6359 PUTINC(code, 0, len);
6360 PUT(tempcode, 1, len);
6361 }
6362 }
6363
6364 #ifdef NEVER
6365 if (len > 0) switch (*tempcode)
6366 {
6367 case OP_STAR: *tempcode = OP_POSSTAR; break;
6368 case OP_PLUS: *tempcode = OP_POSPLUS; break;
6369 case OP_QUERY: *tempcode = OP_POSQUERY; break;
6370 case OP_UPTO: *tempcode = OP_POSUPTO; break;
6371
6372 case OP_STARI: *tempcode = OP_POSSTARI; break;
6373 case OP_PLUSI: *tempcode = OP_POSPLUSI; break;
6374 case OP_QUERYI: *tempcode = OP_POSQUERYI; break;
6375 case OP_UPTOI: *tempcode = OP_POSUPTOI; break;
6376
6377 case OP_NOTSTAR: *tempcode = OP_NOTPOSSTAR; break;
6378 case OP_NOTPLUS: *tempcode = OP_NOTPOSPLUS; break;
6379 case OP_NOTQUERY: *tempcode = OP_NOTPOSQUERY; break;
6380 case OP_NOTUPTO: *tempcode = OP_NOTPOSUPTO; break;
6381
6382 case OP_NOTSTARI: *tempcode = OP_NOTPOSSTARI; break;
6383 case OP_NOTPLUSI: *tempcode = OP_NOTPOSPLUSI; break;
6384 case OP_NOTQUERYI: *tempcode = OP_NOTPOSQUERYI; break;
6385 case OP_NOTUPTOI: *tempcode = OP_NOTPOSUPTOI; break;
6386
6387 case OP_TYPESTAR: *tempcode = OP_TYPEPOSSTAR; break;
6388 case OP_TYPEPLUS: *tempcode = OP_TYPEPOSPLUS; break;
6389 case OP_TYPEQUERY: *tempcode = OP_TYPEPOSQUERY; break;
6390 case OP_TYPEUPTO: *tempcode = OP_TYPEPOSUPTO; break;
6391
6392 case OP_CRSTAR: *tempcode = OP_CRPOSSTAR; break;
6393 case OP_CRPLUS: *tempcode = OP_CRPOSPLUS; break;
6394 case OP_CRQUERY: *tempcode = OP_CRPOSQUERY; break;
6395 case OP_CRRANGE: *tempcode = OP_CRPOSRANGE; break;
6396
6397 /* Because we are moving code along, we must ensure that any
6398 pending recursive references are updated. */
6399
6400 default:
6401 *code = OP_END;
6402 adjust_recurse(tempcode, 1 + LINK_SIZE, utf, cd, save_hwm);
6403 memmove(tempcode + 1 + LINK_SIZE, tempcode, IN_UCHARS(len));
6404 code += 1 + LINK_SIZE;
6405 len += 1 + LINK_SIZE;
6406 tempcode[0] = OP_ONCE;
6407 *code++ = OP_KET;
6408 PUTINC(code, 0, len);
6409 PUT(tempcode, 1, len);
6410 break;
6411 }
6412 #endif
6413 }
6414
6415 /* In all case we no longer have a previous item. We also set the
6416 "follows varying string" flag for subsequently encountered reqchars if
6417 it isn't already set and we have just passed a varying length item. */
6418
6419 END_REPEAT:
6420 previous = NULL;
6421 cd->req_varyopt |= reqvary;
6422 break;
6423
6424
6425 /* ===================================================================*/
6426 /* Start of nested parenthesized sub-expression, or comment or lookahead or
6427 lookbehind or option setting or condition or all the other extended
6428 parenthesis forms. */
6429
6430 case CHAR_LEFT_PARENTHESIS:
6431 newoptions = options;
6432 skipbytes = 0;
6433 bravalue = OP_CBRA;
6434 save_hwm = cd->hwm;
6435 reset_bracount = FALSE;
6436
6437 /* First deal with various "verbs" that can be introduced by '*'. */
6438
6439 ptr++;
6440 if (ptr[0] == CHAR_ASTERISK && (ptr[1] == ':'
6441 || (MAX_255(ptr[1]) && ((cd->ctypes[ptr[1]] & ctype_letter) != 0))))
6442 {
6443 int i, namelen;
6444 int arglen = 0;
6445 const char *vn = verbnames;
6446 const pcre_uchar *name = ptr + 1;
6447 const pcre_uchar *arg = NULL;
6448 previous = NULL;
6449 ptr++;
6450 while (MAX_255(*ptr) && (cd->ctypes[*ptr] & ctype_letter) != 0) ptr++;
6451 namelen = (int)(ptr - name);
6452
6453 /* It appears that Perl allows any characters whatsoever, other than
6454 a closing parenthesis, to appear in arguments, so we no longer insist on
6455 letters, digits, and underscores. */
6456
6457 if (*ptr == CHAR_COLON)
6458 {
6459 arg = ++ptr;
6460 while (*ptr != CHAR_NULL && *ptr != CHAR_RIGHT_PARENTHESIS) ptr++;
6461 arglen = (int)(ptr - arg);
6462 if ((unsigned int)arglen > MAX_MARK)
6463 {
6464 *errorcodeptr = ERR75;
6465 goto FAILED;
6466 }
6467 }
6468
6469 if (*ptr != CHAR_RIGHT_PARENTHESIS)
6470 {
6471 *errorcodeptr = ERR60;
6472 goto FAILED;
6473 }
6474
6475 /* Scan the table of verb names */
6476
6477 for (i = 0; i < verbcount; i++)
6478 {
6479 if (namelen == verbs[i].len &&
6480 STRNCMP_UC_C8(name, vn, namelen) == 0)
6481 {
6482 int setverb;
6483
6484 /* Check for open captures before ACCEPT and convert it to
6485 ASSERT_ACCEPT if in an assertion. */
6486
6487 if (verbs[i].op == OP_ACCEPT)
6488 {
6489 open_capitem *oc;
6490 if (arglen != 0)
6491 {
6492 *errorcodeptr = ERR59;
6493 goto FAILED;
6494 }
6495 cd->had_accept = TRUE;
6496 for (oc = cd->open_caps; oc != NULL; oc = oc->next)
6497 {
6498 *code++ = OP_CLOSE;
6499 PUT2INC(code, 0, oc->number);
6500 }
6501 setverb = *code++ =
6502 (cd->assert_depth > 0)? OP_ASSERT_ACCEPT : OP_ACCEPT;
6503
6504 /* Do not set firstchar after *ACCEPT */
6505 if (firstcharflags == REQ_UNSET) firstcharflags = REQ_NONE;
6506 }
6507
6508 /* Handle other cases with/without an argument */
6509
6510 else if (arglen == 0)
6511 {
6512 if (verbs[i].op < 0) /* Argument is mandatory */
6513 {
6514 *errorcodeptr = ERR66;
6515 goto FAILED;
6516 }
6517 setverb = *code++ = verbs[i].op;
6518 }
6519
6520 else
6521 {
6522 if (verbs[i].op_arg < 0) /* Argument is forbidden */
6523 {
6524 *errorcodeptr = ERR59;
6525 goto FAILED;
6526 }
6527 setverb = *code++ = verbs[i].op_arg;
6528 *code++ = arglen;
6529 memcpy(code, arg, IN_UCHARS(arglen));
6530 code += arglen;
6531 *code++ = 0;
6532 }
6533
6534 switch (setverb)
6535 {
6536 case OP_THEN:
6537 case OP_THEN_ARG:
6538 cd->external_flags |= PCRE_HASTHEN;
6539 break;
6540
6541 case OP_PRUNE:
6542 case OP_PRUNE_ARG:
6543 case OP_SKIP:
6544 case OP_SKIP_ARG:
6545 cd->had_pruneorskip = TRUE;
6546 break;
6547 }
6548
6549 break; /* Found verb, exit loop */
6550 }
6551
6552 vn += verbs[i].len + 1;
6553 }
6554
6555 if (i < verbcount) continue; /* Successfully handled a verb */
6556 *errorcodeptr = ERR60; /* Verb not recognized */
6557 goto FAILED;
6558 }
6559
6560 /* Deal with the extended parentheses; all are introduced by '?', and the
6561 appearance of any of them means that this is not a capturing group. */
6562
6563 else if (*ptr == CHAR_QUESTION_MARK)
6564 {
6565 int i, set, unset, namelen;
6566 int *optset;
6567 const pcre_uchar *name;
6568 pcre_uchar *slot;
6569
6570 switch (*(++ptr))
6571 {
6572 case CHAR_NUMBER_SIGN: /* Comment; skip to ket */
6573 ptr++;
6574 while (*ptr != CHAR_NULL && *ptr != CHAR_RIGHT_PARENTHESIS) ptr++;
6575 if (*ptr == CHAR_NULL)
6576 {
6577 *errorcodeptr = ERR18;
6578 goto FAILED;
6579 }
6580 continue;
6581
6582
6583 /* ------------------------------------------------------------ */
6584 case CHAR_VERTICAL_LINE: /* Reset capture count for each branch */
6585 reset_bracount = TRUE;
6586 /* Fall through */
6587
6588 /* ------------------------------------------------------------ */
6589 case CHAR_COLON: /* Non-capturing bracket */
6590 bravalue = OP_BRA;
6591 ptr++;
6592 break;
6593
6594
6595 /* ------------------------------------------------------------ */
6596 case CHAR_LEFT_PARENTHESIS:
6597 bravalue = OP_COND; /* Conditional group */
6598 tempptr = ptr;
6599
6600 /* A condition can be an assertion, a number (referring to a numbered
6601 group's having been set), a name (referring to a named group), or 'R',
6602 referring to recursion. R<digits> and R&name are also permitted for
6603 recursion tests.
6604
6605 There are ways of testing a named group: (?(name)) is used by Python;
6606 Perl 5.10 onwards uses (?(<name>) or (?('name')).
6607
6608 There is one unfortunate ambiguity, caused by history. 'R' can be the
6609 recursive thing or the name 'R' (and similarly for 'R' followed by
6610 digits). We look for a name first; if not found, we try the other case.
6611
6612 For compatibility with auto-callouts, we allow a callout to be
6613 specified before a condition that is an assertion. First, check for the
6614 syntax of a callout; if found, adjust the temporary pointer that is
6615 used to check for an assertion condition. That's all that is needed! */
6616
6617 if (ptr[1] == CHAR_QUESTION_MARK && ptr[2] == CHAR_C)
6618 {
6619 for (i = 3;; i++) if (!IS_DIGIT(ptr[i])) break;
6620 if (ptr[i] == CHAR_RIGHT_PARENTHESIS)
6621 tempptr += i + 1;
6622 }
6623
6624 /* For conditions that are assertions, check the syntax, and then exit
6625 the switch. This will take control down to where bracketed groups,
6626 including assertions, are processed. */
6627
6628 if (tempptr[1] == CHAR_QUESTION_MARK &&
6629 (tempptr[2] == CHAR_EQUALS_SIGN ||
6630 tempptr[2] == CHAR_EXCLAMATION_MARK ||
6631 tempptr[2] == CHAR_LESS_THAN_SIGN))
6632 break;
6633
6634 /* Other conditions use OP_CREF/OP_DNCREF/OP_RREF/OP_DNRREF, and all
6635 need to skip at least 1+IMM2_SIZE bytes at the start of the group. */
6636
6637 code[1+LINK_SIZE] = OP_CREF;
6638 skipbytes = 1+IMM2_SIZE;
6639 refsign = -1; /* => not a number */
6640 namelen = -1; /* => not a name; must set to avoid warning */
6641 name = NULL; /* Always set to avoid warning */
6642 recno = 0; /* Always set to avoid warning */
6643
6644 /* Check for a test for recursion in a named group. */
6645
6646 ptr++;
6647 if (*ptr == CHAR_R && ptr[1] == CHAR_AMPERSAND)
6648 {
6649 terminator = -1;
6650 ptr += 2;
6651 code[1+LINK_SIZE] = OP_RREF; /* Change the type of test */
6652 }
6653
6654 /* Check for a test for a named group's having been set, using the Perl
6655 syntax (?(<name>) or (?('name'), and also allow for the original PCRE
6656 syntax of (?(name) or for (?(+n), (?(-n), and just (?(n). */
6657