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Contents of /code/branches/pcre16/pcre_compile.c

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Revision 804 - (show annotations)
Wed Dec 14 11:18:01 2011 UTC (9 years, 4 months ago) by zherczeg
File MIME type: text/plain
File size: 266116 byte(s)
PUBL macro added, single char optimization is fixed, MAX_255 checks are added, pcre_jit_test now copy the default tables to help valgrind
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) 1997-2011 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 processed string start */
51 #define PSEND end_pattern /* Field containing processed string end */
52
53 #include "pcre_internal.h"
54
55
56 /* When PCRE_DEBUG is defined, we need the pcre_printint() function, which is
57 also used by pcretest. PCRE_DEBUG is not defined when building a production
58 library. */
59
60 #ifdef PCRE_DEBUG
61 #include "pcre_printint.src"
62 #endif
63
64
65 /* Macro for setting individual bits in class bitmaps. */
66
67 #define SETBIT(a,b) a[b/8] |= (1 << (b%8))
68
69 /* Maximum length value to check against when making sure that the integer that
70 holds the compiled pattern length does not overflow. We make it a bit less than
71 INT_MAX to allow for adding in group terminating bytes, so that we don't have
72 to check them every time. */
73
74 #define OFLOW_MAX (INT_MAX - 20)
75
76
77 /*************************************************
78 * Code parameters and static tables *
79 *************************************************/
80
81 /* This value specifies the size of stack workspace that is used during the
82 first pre-compile phase that determines how much memory is required. The regex
83 is partly compiled into this space, but the compiled parts are discarded as
84 soon as they can be, so that hopefully there will never be an overrun. The code
85 does, however, check for an overrun. The largest amount I've seen used is 218,
86 so this number is very generous.
87
88 The same workspace is used during the second, actual compile phase for
89 remembering forward references to groups so that they can be filled in at the
90 end. Each entry in this list occupies LINK_SIZE bytes, so even when LINK_SIZE
91 is 4 there is plenty of room for most patterns. However, the memory can get
92 filled up by repetitions of forward references, for example patterns like
93 /(?1){0,1999}(b)/, and one user did hit the limit. The code has been changed so
94 that the workspace is expanded using malloc() in this situation. The value
95 below is therefore a minimum, and we put a maximum on it for safety. The
96 minimum is now also defined in terms of LINK_SIZE so that the use of malloc()
97 kicks in at the same number of forward references in all cases. */
98
99 #define COMPILE_WORK_SIZE (2048*LINK_SIZE)
100 #define COMPILE_WORK_SIZE_MAX (100*COMPILE_WORK_SIZE)
101
102 /* The overrun tests check for a slightly smaller size so that they detect the
103 overrun before it actually does run off the end of the data block. */
104
105 #define WORK_SIZE_SAFETY_MARGIN (100)
106
107 /* Private flags added to firstchar and reqchar. */
108
109 #define REQ_CASELESS 0x10000000l /* Indicates caselessness */
110 #define REQ_VARY 0x20000000l /* Reqchar followed non-literal item */
111
112 /* Repeated character flags. */
113
114 #define UTF_LENGTH 0x10000000l /* The char contains its length. */
115
116 /* Table for handling escaped characters in the range '0'-'z'. Positive returns
117 are simple data values; negative values are for special things like \d and so
118 on. Zero means further processing is needed (for things like \x), or the escape
119 is invalid. */
120
121 #ifndef EBCDIC
122
123 /* This is the "normal" table for ASCII systems or for EBCDIC systems running
124 in UTF-8 mode. */
125
126 static const short int escapes[] = {
127 0, 0,
128 0, 0,
129 0, 0,
130 0, 0,
131 0, 0,
132 CHAR_COLON, CHAR_SEMICOLON,
133 CHAR_LESS_THAN_SIGN, CHAR_EQUALS_SIGN,
134 CHAR_GREATER_THAN_SIGN, CHAR_QUESTION_MARK,
135 CHAR_COMMERCIAL_AT, -ESC_A,
136 -ESC_B, -ESC_C,
137 -ESC_D, -ESC_E,
138 0, -ESC_G,
139 -ESC_H, 0,
140 0, -ESC_K,
141 0, 0,
142 -ESC_N, 0,
143 -ESC_P, -ESC_Q,
144 -ESC_R, -ESC_S,
145 0, 0,
146 -ESC_V, -ESC_W,
147 -ESC_X, 0,
148 -ESC_Z, CHAR_LEFT_SQUARE_BRACKET,
149 CHAR_BACKSLASH, CHAR_RIGHT_SQUARE_BRACKET,
150 CHAR_CIRCUMFLEX_ACCENT, CHAR_UNDERSCORE,
151 CHAR_GRAVE_ACCENT, 7,
152 -ESC_b, 0,
153 -ESC_d, ESC_e,
154 ESC_f, 0,
155 -ESC_h, 0,
156 0, -ESC_k,
157 0, 0,
158 ESC_n, 0,
159 -ESC_p, 0,
160 ESC_r, -ESC_s,
161 ESC_tee, 0,
162 -ESC_v, -ESC_w,
163 0, 0,
164 -ESC_z
165 };
166
167 #else
168
169 /* This is the "abnormal" table for EBCDIC systems without UTF-8 support. */
170
171 static const short int escapes[] = {
172 /* 48 */ 0, 0, 0, '.', '<', '(', '+', '|',
173 /* 50 */ '&', 0, 0, 0, 0, 0, 0, 0,
174 /* 58 */ 0, 0, '!', '$', '*', ')', ';', '~',
175 /* 60 */ '-', '/', 0, 0, 0, 0, 0, 0,
176 /* 68 */ 0, 0, '|', ',', '%', '_', '>', '?',
177 /* 70 */ 0, 0, 0, 0, 0, 0, 0, 0,
178 /* 78 */ 0, '`', ':', '#', '@', '\'', '=', '"',
179 /* 80 */ 0, 7, -ESC_b, 0, -ESC_d, ESC_e, ESC_f, 0,
180 /* 88 */-ESC_h, 0, 0, '{', 0, 0, 0, 0,
181 /* 90 */ 0, 0, -ESC_k, 'l', 0, ESC_n, 0, -ESC_p,
182 /* 98 */ 0, ESC_r, 0, '}', 0, 0, 0, 0,
183 /* A0 */ 0, '~', -ESC_s, ESC_tee, 0,-ESC_v, -ESC_w, 0,
184 /* A8 */ 0,-ESC_z, 0, 0, 0, '[', 0, 0,
185 /* B0 */ 0, 0, 0, 0, 0, 0, 0, 0,
186 /* B8 */ 0, 0, 0, 0, 0, ']', '=', '-',
187 /* C0 */ '{',-ESC_A, -ESC_B, -ESC_C, -ESC_D,-ESC_E, 0, -ESC_G,
188 /* C8 */-ESC_H, 0, 0, 0, 0, 0, 0, 0,
189 /* D0 */ '}', 0, -ESC_K, 0, 0,-ESC_N, 0, -ESC_P,
190 /* D8 */-ESC_Q,-ESC_R, 0, 0, 0, 0, 0, 0,
191 /* E0 */ '\\', 0, -ESC_S, 0, 0,-ESC_V, -ESC_W, -ESC_X,
192 /* E8 */ 0,-ESC_Z, 0, 0, 0, 0, 0, 0,
193 /* F0 */ 0, 0, 0, 0, 0, 0, 0, 0,
194 /* F8 */ 0, 0, 0, 0, 0, 0, 0, 0
195 };
196 #endif
197
198
199 /* Table of special "verbs" like (*PRUNE). This is a short table, so it is
200 searched linearly. Put all the names into a single string, in order to reduce
201 the number of relocations when a shared library is dynamically linked. The
202 string is built from string macros so that it works in UTF-8 mode on EBCDIC
203 platforms. */
204
205 typedef struct verbitem {
206 int len; /* Length of verb name */
207 int op; /* Op when no arg, or -1 if arg mandatory */
208 int op_arg; /* Op when arg present, or -1 if not allowed */
209 } verbitem;
210
211 static const char verbnames[] =
212 "\0" /* Empty name is a shorthand for MARK */
213 STRING_MARK0
214 STRING_ACCEPT0
215 STRING_COMMIT0
216 STRING_F0
217 STRING_FAIL0
218 STRING_PRUNE0
219 STRING_SKIP0
220 STRING_THEN;
221
222 static const verbitem verbs[] = {
223 { 0, -1, OP_MARK },
224 { 4, -1, OP_MARK },
225 { 6, OP_ACCEPT, -1 },
226 { 6, OP_COMMIT, -1 },
227 { 1, OP_FAIL, -1 },
228 { 4, OP_FAIL, -1 },
229 { 5, OP_PRUNE, OP_PRUNE_ARG },
230 { 4, OP_SKIP, OP_SKIP_ARG },
231 { 4, OP_THEN, OP_THEN_ARG }
232 };
233
234 static const int verbcount = sizeof(verbs)/sizeof(verbitem);
235
236
237 /* Tables of names of POSIX character classes and their lengths. The names are
238 now all in a single string, to reduce the number of relocations when a shared
239 library is dynamically loaded. The list of lengths is terminated by a zero
240 length entry. The first three must be alpha, lower, upper, as this is assumed
241 for handling case independence. */
242
243 static const char posix_names[] =
244 STRING_alpha0 STRING_lower0 STRING_upper0 STRING_alnum0
245 STRING_ascii0 STRING_blank0 STRING_cntrl0 STRING_digit0
246 STRING_graph0 STRING_print0 STRING_punct0 STRING_space0
247 STRING_word0 STRING_xdigit;
248
249 static const pcre_uint8 posix_name_lengths[] = {
250 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 6, 0 };
251
252 /* Table of class bit maps for each POSIX class. Each class is formed from a
253 base map, with an optional addition or removal of another map. Then, for some
254 classes, there is some additional tweaking: for [:blank:] the vertical space
255 characters are removed, and for [:alpha:] and [:alnum:] the underscore
256 character is removed. The triples in the table consist of the base map offset,
257 second map offset or -1 if no second map, and a non-negative value for map
258 addition or a negative value for map subtraction (if there are two maps). The
259 absolute value of the third field has these meanings: 0 => no tweaking, 1 =>
260 remove vertical space characters, 2 => remove underscore. */
261
262 static const int posix_class_maps[] = {
263 cbit_word, cbit_digit, -2, /* alpha */
264 cbit_lower, -1, 0, /* lower */
265 cbit_upper, -1, 0, /* upper */
266 cbit_word, -1, 2, /* alnum - word without underscore */
267 cbit_print, cbit_cntrl, 0, /* ascii */
268 cbit_space, -1, 1, /* blank - a GNU extension */
269 cbit_cntrl, -1, 0, /* cntrl */
270 cbit_digit, -1, 0, /* digit */
271 cbit_graph, -1, 0, /* graph */
272 cbit_print, -1, 0, /* print */
273 cbit_punct, -1, 0, /* punct */
274 cbit_space, -1, 0, /* space */
275 cbit_word, -1, 0, /* word - a Perl extension */
276 cbit_xdigit,-1, 0 /* xdigit */
277 };
278
279 /* Table of substitutes for \d etc when PCRE_UCP is set. The POSIX class
280 substitutes must be in the order of the names, defined above, and there are
281 both positive and negative cases. NULL means no substitute. */
282
283 #ifdef SUPPORT_UCP
284 static const pcre_uchar string_PNd[] = {
285 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
286 CHAR_N, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
287 static const pcre_uchar string_pNd[] = {
288 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
289 CHAR_N, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
290 static const pcre_uchar string_PXsp[] = {
291 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
292 CHAR_X, CHAR_s, CHAR_p, CHAR_RIGHT_CURLY_BRACKET, '\0' };
293 static const pcre_uchar string_pXsp[] = {
294 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
295 CHAR_X, CHAR_s, CHAR_p, CHAR_RIGHT_CURLY_BRACKET, '\0' };
296 static const pcre_uchar string_PXwd[] = {
297 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
298 CHAR_X, CHAR_w, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
299 static const pcre_uchar string_pXwd[] = {
300 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
301 CHAR_X, CHAR_w, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
302
303 static const pcre_uchar *substitutes[] = {
304 string_PNd, /* \D */
305 string_pNd, /* \d */
306 string_PXsp, /* \S */ /* NOTE: Xsp is Perl space */
307 string_pXsp, /* \s */
308 string_PXwd, /* \W */
309 string_pXwd /* \w */
310 };
311
312 static const pcre_uchar string_pL[] = {
313 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
314 CHAR_L, CHAR_RIGHT_CURLY_BRACKET, '\0' };
315 static const pcre_uchar string_pLl[] = {
316 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
317 CHAR_L, CHAR_l, CHAR_RIGHT_CURLY_BRACKET, '\0' };
318 static const pcre_uchar string_pLu[] = {
319 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
320 CHAR_L, CHAR_u, CHAR_RIGHT_CURLY_BRACKET, '\0' };
321 static const pcre_uchar string_pXan[] = {
322 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
323 CHAR_X, CHAR_a, CHAR_n, CHAR_RIGHT_CURLY_BRACKET, '\0' };
324 static const pcre_uchar string_h[] = {
325 CHAR_BACKSLASH, CHAR_h, '\0' };
326 static const pcre_uchar string_pXps[] = {
327 CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
328 CHAR_X, CHAR_p, CHAR_s, CHAR_RIGHT_CURLY_BRACKET, '\0' };
329 static const pcre_uchar string_PL[] = {
330 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
331 CHAR_L, CHAR_RIGHT_CURLY_BRACKET, '\0' };
332 static const pcre_uchar string_PLl[] = {
333 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
334 CHAR_L, CHAR_l, CHAR_RIGHT_CURLY_BRACKET, '\0' };
335 static const pcre_uchar string_PLu[] = {
336 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
337 CHAR_L, CHAR_u, CHAR_RIGHT_CURLY_BRACKET, '\0' };
338 static const pcre_uchar string_PXan[] = {
339 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
340 CHAR_X, CHAR_a, CHAR_n, CHAR_RIGHT_CURLY_BRACKET, '\0' };
341 static const pcre_uchar string_H[] = {
342 CHAR_BACKSLASH, CHAR_H, '\0' };
343 static const pcre_uchar string_PXps[] = {
344 CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
345 CHAR_X, CHAR_p, CHAR_s, CHAR_RIGHT_CURLY_BRACKET, '\0' };
346
347 static const pcre_uchar *posix_substitutes[] = {
348 string_pL, /* alpha */
349 string_pLl, /* lower */
350 string_pLu, /* upper */
351 string_pXan, /* alnum */
352 NULL, /* ascii */
353 string_h, /* blank */
354 NULL, /* cntrl */
355 string_pNd, /* digit */
356 NULL, /* graph */
357 NULL, /* print */
358 NULL, /* punct */
359 string_pXps, /* space */ /* NOTE: Xps is POSIX space */
360 string_pXwd, /* word */
361 NULL, /* xdigit */
362 /* Negated cases */
363 string_PL, /* ^alpha */
364 string_PLl, /* ^lower */
365 string_PLu, /* ^upper */
366 string_PXan, /* ^alnum */
367 NULL, /* ^ascii */
368 string_H, /* ^blank */
369 NULL, /* ^cntrl */
370 string_PNd, /* ^digit */
371 NULL, /* ^graph */
372 NULL, /* ^print */
373 NULL, /* ^punct */
374 string_PXps, /* ^space */ /* NOTE: Xps is POSIX space */
375 string_PXwd, /* ^word */
376 NULL /* ^xdigit */
377 };
378 #define POSIX_SUBSIZE (sizeof(posix_substitutes) / sizeof(pcre_uchar *))
379 #endif
380
381 #define STRING(a) # a
382 #define XSTRING(s) STRING(s)
383
384 /* The texts of compile-time error messages. These are "char *" because they
385 are passed to the outside world. Do not ever re-use any error number, because
386 they are documented. Always add a new error instead. Messages marked DEAD below
387 are no longer used. This used to be a table of strings, but in order to reduce
388 the number of relocations needed when a shared library is loaded dynamically,
389 it is now one long string. We cannot use a table of offsets, because the
390 lengths of inserts such as XSTRING(MAX_NAME_SIZE) are not known. Instead, we
391 simply count through to the one we want - this isn't a performance issue
392 because these strings are used only when there is a compilation error.
393
394 Each substring ends with \0 to insert a null character. This includes the final
395 substring, so that the whole string ends with \0\0, which can be detected when
396 counting through. */
397
398 static const char error_texts[] =
399 "no error\0"
400 "\\ at end of pattern\0"
401 "\\c at end of pattern\0"
402 "unrecognized character follows \\\0"
403 "numbers out of order in {} quantifier\0"
404 /* 5 */
405 "number too big in {} quantifier\0"
406 "missing terminating ] for character class\0"
407 "invalid escape sequence in character class\0"
408 "range out of order in character class\0"
409 "nothing to repeat\0"
410 /* 10 */
411 "operand of unlimited repeat could match the empty string\0" /** DEAD **/
412 "internal error: unexpected repeat\0"
413 "unrecognized character after (? or (?-\0"
414 "POSIX named classes are supported only within a class\0"
415 "missing )\0"
416 /* 15 */
417 "reference to non-existent subpattern\0"
418 "erroffset passed as NULL\0"
419 "unknown option bit(s) set\0"
420 "missing ) after comment\0"
421 "parentheses nested too deeply\0" /** DEAD **/
422 /* 20 */
423 "regular expression is too large\0"
424 "failed to get memory\0"
425 "unmatched parentheses\0"
426 "internal error: code overflow\0"
427 "unrecognized character after (?<\0"
428 /* 25 */
429 "lookbehind assertion is not fixed length\0"
430 "malformed number or name after (?(\0"
431 "conditional group contains more than two branches\0"
432 "assertion expected after (?(\0"
433 "(?R or (?[+-]digits must be followed by )\0"
434 /* 30 */
435 "unknown POSIX class name\0"
436 "POSIX collating elements are not supported\0"
437 "this version of PCRE is not compiled with PCRE_UTF8 support\0"
438 "spare error\0" /** DEAD **/
439 "character value in \\x{...} sequence is too large\0"
440 /* 35 */
441 "invalid condition (?(0)\0"
442 "\\C not allowed in lookbehind assertion\0"
443 "PCRE does not support \\L, \\l, \\N{name}, \\U, or \\u\0"
444 "number after (?C is > 255\0"
445 "closing ) for (?C expected\0"
446 /* 40 */
447 "recursive call could loop indefinitely\0"
448 "unrecognized character after (?P\0"
449 "syntax error in subpattern name (missing terminator)\0"
450 "two named subpatterns have the same name\0"
451 "invalid UTF-8 string\0"
452 /* 45 */
453 "support for \\P, \\p, and \\X has not been compiled\0"
454 "malformed \\P or \\p sequence\0"
455 "unknown property name after \\P or \\p\0"
456 "subpattern name is too long (maximum " XSTRING(MAX_NAME_SIZE) " characters)\0"
457 "too many named subpatterns (maximum " XSTRING(MAX_NAME_COUNT) ")\0"
458 /* 50 */
459 "repeated subpattern is too long\0" /** DEAD **/
460 "octal value is greater than \\377 (not in UTF-8 mode)\0"
461 "internal error: overran compiling workspace\0"
462 "internal error: previously-checked referenced subpattern not found\0"
463 "DEFINE group contains more than one branch\0"
464 /* 55 */
465 "repeating a DEFINE group is not allowed\0" /** DEAD **/
466 "inconsistent NEWLINE options\0"
467 "\\g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number\0"
468 "a numbered reference must not be zero\0"
469 "an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT)\0"
470 /* 60 */
471 "(*VERB) not recognized\0"
472 "number is too big\0"
473 "subpattern name expected\0"
474 "digit expected after (?+\0"
475 "] is an invalid data character in JavaScript compatibility mode\0"
476 /* 65 */
477 "different names for subpatterns of the same number are not allowed\0"
478 "(*MARK) must have an argument\0"
479 "this version of PCRE is not compiled with PCRE_UCP support\0"
480 "\\c must be followed by an ASCII character\0"
481 "\\k is not followed by a braced, angle-bracketed, or quoted name\0"
482 /* 70 */
483 "internal error: unknown opcode in find_fixedlength()\0"
484 "\\N is not supported in a class\0"
485 "too many forward references\0"
486 "disallowed UTF-8/16 code point (>= 0xd800 && <= 0xdfff)\0"
487 ;
488
489 /* Table to identify digits and hex digits. This is used when compiling
490 patterns. Note that the tables in chartables are dependent on the locale, and
491 may mark arbitrary characters as digits - but the PCRE compiling code expects
492 to handle only 0-9, a-z, and A-Z as digits when compiling. That is why we have
493 a private table here. It costs 256 bytes, but it is a lot faster than doing
494 character value tests (at least in some simple cases I timed), and in some
495 applications one wants PCRE to compile efficiently as well as match
496 efficiently.
497
498 For convenience, we use the same bit definitions as in chartables:
499
500 0x04 decimal digit
501 0x08 hexadecimal digit
502
503 Then we can use ctype_digit and ctype_xdigit in the code. */
504
505 /* Using a simple comparison for decimal numbers rather than a memory read
506 is much faster, and the resulting code is simpler (the compiler turns it
507 into a subtraction and unsigned comparison). */
508
509 #define IS_DIGIT(x) ((x) >= CHAR_0 && (x) <= CHAR_9)
510
511 #ifndef EBCDIC
512
513 /* This is the "normal" case, for ASCII systems, and EBCDIC systems running in
514 UTF-8 mode. */
515
516 static const pcre_uint8 digitab[] =
517 {
518 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 0- 7 */
519 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 8- 15 */
520 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 16- 23 */
521 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24- 31 */
522 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - ' */
523 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* ( - / */
524 0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c, /* 0 - 7 */
525 0x0c,0x0c,0x00,0x00,0x00,0x00,0x00,0x00, /* 8 - ? */
526 0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* @ - G */
527 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* H - O */
528 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* P - W */
529 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* X - _ */
530 0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* ` - g */
531 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* h - o */
532 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* p - w */
533 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* x -127 */
534 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 128-135 */
535 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 136-143 */
536 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 144-151 */
537 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 152-159 */
538 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 160-167 */
539 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 168-175 */
540 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 176-183 */
541 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 184-191 */
542 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 192-199 */
543 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 200-207 */
544 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 208-215 */
545 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 216-223 */
546 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 224-231 */
547 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 232-239 */
548 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 240-247 */
549 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};/* 248-255 */
550
551 #else
552
553 /* This is the "abnormal" case, for EBCDIC systems not running in UTF-8 mode. */
554
555 static const pcre_uint8 digitab[] =
556 {
557 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 0- 7 0 */
558 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 8- 15 */
559 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 16- 23 10 */
560 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24- 31 */
561 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 32- 39 20 */
562 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 40- 47 */
563 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 48- 55 30 */
564 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 56- 63 */
565 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - 71 40 */
566 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 72- | */
567 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* & - 87 50 */
568 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 88- 95 */
569 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - -103 60 */
570 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 104- ? */
571 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112-119 70 */
572 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 120- " */
573 0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* 128- g 80 */
574 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* h -143 */
575 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 144- p 90 */
576 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* q -159 */
577 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 160- x A0 */
578 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* y -175 */
579 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* ^ -183 B0 */
580 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 184-191 */
581 0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* { - G C0 */
582 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* H -207 */
583 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* } - P D0 */
584 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Q -223 */
585 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* \ - X E0 */
586 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Y -239 */
587 0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c, /* 0 - 7 F0 */
588 0x0c,0x0c,0x00,0x00,0x00,0x00,0x00,0x00};/* 8 -255 */
589
590 static const pcre_uint8 ebcdic_chartab[] = { /* chartable partial dup */
591 0x80,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /* 0- 7 */
592 0x00,0x00,0x00,0x00,0x01,0x01,0x00,0x00, /* 8- 15 */
593 0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /* 16- 23 */
594 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24- 31 */
595 0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /* 32- 39 */
596 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 40- 47 */
597 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 48- 55 */
598 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 56- 63 */
599 0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - 71 */
600 0x00,0x00,0x00,0x80,0x00,0x80,0x80,0x80, /* 72- | */
601 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* & - 87 */
602 0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00, /* 88- 95 */
603 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - -103 */
604 0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x80, /* 104- ? */
605 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112-119 */
606 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 120- " */
607 0x00,0x1a,0x1a,0x1a,0x1a,0x1a,0x1a,0x12, /* 128- g */
608 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* h -143 */
609 0x00,0x12,0x12,0x12,0x12,0x12,0x12,0x12, /* 144- p */
610 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* q -159 */
611 0x00,0x00,0x12,0x12,0x12,0x12,0x12,0x12, /* 160- x */
612 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* y -175 */
613 0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* ^ -183 */
614 0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00, /* 184-191 */
615 0x80,0x1a,0x1a,0x1a,0x1a,0x1a,0x1a,0x12, /* { - G */
616 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* H -207 */
617 0x00,0x12,0x12,0x12,0x12,0x12,0x12,0x12, /* } - P */
618 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* Q -223 */
619 0x00,0x00,0x12,0x12,0x12,0x12,0x12,0x12, /* \ - X */
620 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* Y -239 */
621 0x1c,0x1c,0x1c,0x1c,0x1c,0x1c,0x1c,0x1c, /* 0 - 7 */
622 0x1c,0x1c,0x00,0x00,0x00,0x00,0x00,0x00};/* 8 -255 */
623 #endif
624
625
626 /* Definition to allow mutual recursion */
627
628 static BOOL
629 compile_regex(int, pcre_uchar **, const pcre_uchar **, int *, BOOL, BOOL, int, int,
630 int *, int *, branch_chain *, compile_data *, int *);
631
632
633
634 /*************************************************
635 * Find an error text *
636 *************************************************/
637
638 /* The error texts are now all in one long string, to save on relocations. As
639 some of the text is of unknown length, we can't use a table of offsets.
640 Instead, just count through the strings. This is not a performance issue
641 because it happens only when there has been a compilation error.
642
643 Argument: the error number
644 Returns: pointer to the error string
645 */
646
647 static const char *
648 find_error_text(int n)
649 {
650 const char *s = error_texts;
651 for (; n > 0; n--)
652 {
653 while (*s++ != 0) {};
654 if (*s == 0) return "Error text not found (please report)";
655 }
656 return s;
657 }
658
659
660 /*************************************************
661 * Expand the workspace *
662 *************************************************/
663
664 /* This function is called during the second compiling phase, if the number of
665 forward references fills the existing workspace, which is originally a block on
666 the stack. A larger block is obtained from malloc() unless the ultimate limit
667 has been reached or the increase will be rather small.
668
669 Argument: pointer to the compile data block
670 Returns: 0 if all went well, else an error number
671 */
672
673 static int
674 expand_workspace(compile_data *cd)
675 {
676 pcre_uchar *newspace;
677 int newsize = cd->workspace_size * 2;
678
679 if (newsize > COMPILE_WORK_SIZE_MAX) newsize = COMPILE_WORK_SIZE_MAX;
680 if (cd->workspace_size >= COMPILE_WORK_SIZE_MAX ||
681 newsize - cd->workspace_size < WORK_SIZE_SAFETY_MARGIN)
682 return ERR72;
683
684 newspace = (PUBL(malloc))(newsize);
685 if (newspace == NULL) return ERR21;
686
687 memcpy(newspace, cd->start_workspace, cd->workspace_size);
688 cd->hwm = (pcre_uchar *)newspace + (cd->hwm - cd->start_workspace);
689 if (cd->workspace_size > COMPILE_WORK_SIZE)
690 (PUBL(free))((void *)cd->start_workspace);
691 cd->start_workspace = newspace;
692 cd->workspace_size = newsize;
693 return 0;
694 }
695
696
697
698 /*************************************************
699 * Check for counted repeat *
700 *************************************************/
701
702 /* This function is called when a '{' is encountered in a place where it might
703 start a quantifier. It looks ahead to see if it really is a quantifier or not.
704 It is only a quantifier if it is one of the forms {ddd} {ddd,} or {ddd,ddd}
705 where the ddds are digits.
706
707 Arguments:
708 p pointer to the first char after '{'
709
710 Returns: TRUE or FALSE
711 */
712
713 static BOOL
714 is_counted_repeat(const pcre_uchar *p)
715 {
716 if (!IS_DIGIT(*p)) return FALSE;
717 p++;
718 while (IS_DIGIT(*p)) p++;
719 if (*p == CHAR_RIGHT_CURLY_BRACKET) return TRUE;
720
721 if (*p++ != CHAR_COMMA) return FALSE;
722 if (*p == CHAR_RIGHT_CURLY_BRACKET) return TRUE;
723
724 if (!IS_DIGIT(*p)) return FALSE;
725 p++;
726 while (IS_DIGIT(*p)) p++;
727
728 return (*p == CHAR_RIGHT_CURLY_BRACKET);
729 }
730
731
732
733 /*************************************************
734 * Handle escapes *
735 *************************************************/
736
737 /* This function is called when a \ has been encountered. It either returns a
738 positive value for a simple escape such as \n, or a negative value which
739 encodes one of the more complicated things such as \d. A backreference to group
740 n is returned as -(ESC_REF + n); ESC_REF is the highest ESC_xxx macro. When
741 UTF-8 is enabled, a positive value greater than 255 may be returned. On entry,
742 ptr is pointing at the \. On exit, it is on the final character of the escape
743 sequence.
744
745 Arguments:
746 ptrptr points to the pattern position pointer
747 errorcodeptr points to the errorcode variable
748 bracount number of previous extracting brackets
749 options the options bits
750 isclass TRUE if inside a character class
751
752 Returns: zero or positive => a data character
753 negative => a special escape sequence
754 on error, errorcodeptr is set
755 */
756
757 static int
758 check_escape(const pcre_uchar **ptrptr, int *errorcodeptr, int bracount,
759 int options, BOOL isclass)
760 {
761 /* PCRE_UTF16 has the same value as PCRE_UTF8. */
762 BOOL utf = (options & PCRE_UTF8) != 0;
763 const pcre_uchar *ptr = *ptrptr + 1;
764 pcre_int32 c;
765 int i;
766
767 GETCHARINCTEST(c, ptr); /* Get character value, increment pointer */
768 ptr--; /* Set pointer back to the last byte */
769
770 /* If backslash is at the end of the pattern, it's an error. */
771
772 if (c == 0) *errorcodeptr = ERR1;
773
774 /* Non-alphanumerics are literals. For digits or letters, do an initial lookup
775 in a table. A non-zero result is something that can be returned immediately.
776 Otherwise further processing may be required. */
777
778 #ifndef EBCDIC /* ASCII/UTF-8 coding */
779 /* Not alphanumeric */
780 else if (c < CHAR_0 || c > CHAR_z) {}
781 else if ((i = escapes[c - CHAR_0]) != 0) c = i;
782
783 #else /* EBCDIC coding */
784 /* Not alphanumeric */
785 else if (c < 'a' || (!MAX_255(c) || (ebcdic_chartab[c] & 0x0E) == 0)) {}
786 else if ((i = escapes[c - 0x48]) != 0) c = i;
787 #endif
788
789 /* Escapes that need further processing, or are illegal. */
790
791 else
792 {
793 const pcre_uchar *oldptr;
794 BOOL braced, negated;
795
796 switch (c)
797 {
798 /* A number of Perl escapes are not handled by PCRE. We give an explicit
799 error. */
800
801 case CHAR_l:
802 case CHAR_L:
803 *errorcodeptr = ERR37;
804 break;
805
806 case CHAR_u:
807 if ((options & PCRE_JAVASCRIPT_COMPAT) != 0)
808 {
809 /* In JavaScript, \u must be followed by four hexadecimal numbers.
810 Otherwise it is a lowercase u letter. */
811 if (MAX_255(ptr[1]) && (digitab[ptr[1]] & ctype_xdigit) != 0
812 && MAX_255(ptr[2]) && (digitab[ptr[2]] & ctype_xdigit) != 0
813 && MAX_255(ptr[3]) && (digitab[ptr[3]] & ctype_xdigit) != 0
814 && MAX_255(ptr[4]) && (digitab[ptr[4]] & ctype_xdigit) != 0)
815 {
816 c = 0;
817 for (i = 0; i < 4; ++i)
818 {
819 register int cc = *(++ptr);
820 #ifndef EBCDIC /* ASCII/UTF-8 coding */
821 if (cc >= CHAR_a) cc -= 32; /* Convert to upper case */
822 c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
823 #else /* EBCDIC coding */
824 if (cc >= CHAR_a && cc <= CHAR_z) cc += 64; /* Convert to upper case */
825 c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
826 #endif
827 }
828 }
829 }
830 else
831 *errorcodeptr = ERR37;
832 break;
833
834 case CHAR_U:
835 /* In JavaScript, \U is an uppercase U letter. */
836 if ((options & PCRE_JAVASCRIPT_COMPAT) == 0) *errorcodeptr = ERR37;
837 break;
838
839 /* In a character class, \g is just a literal "g". Outside a character
840 class, \g must be followed by one of a number of specific things:
841
842 (1) A number, either plain or braced. If positive, it is an absolute
843 backreference. If negative, it is a relative backreference. This is a Perl
844 5.10 feature.
845
846 (2) Perl 5.10 also supports \g{name} as a reference to a named group. This
847 is part of Perl's movement towards a unified syntax for back references. As
848 this is synonymous with \k{name}, we fudge it up by pretending it really
849 was \k.
850
851 (3) For Oniguruma compatibility we also support \g followed by a name or a
852 number either in angle brackets or in single quotes. However, these are
853 (possibly recursive) subroutine calls, _not_ backreferences. Just return
854 the -ESC_g code (cf \k). */
855
856 case CHAR_g:
857 if (isclass) break;
858 if (ptr[1] == CHAR_LESS_THAN_SIGN || ptr[1] == CHAR_APOSTROPHE)
859 {
860 c = -ESC_g;
861 break;
862 }
863
864 /* Handle the Perl-compatible cases */
865
866 if (ptr[1] == CHAR_LEFT_CURLY_BRACKET)
867 {
868 const pcre_uchar *p;
869 for (p = ptr+2; *p != 0 && *p != CHAR_RIGHT_CURLY_BRACKET; p++)
870 if (*p != CHAR_MINUS && !IS_DIGIT(*p)) break;
871 if (*p != 0 && *p != CHAR_RIGHT_CURLY_BRACKET)
872 {
873 c = -ESC_k;
874 break;
875 }
876 braced = TRUE;
877 ptr++;
878 }
879 else braced = FALSE;
880
881 if (ptr[1] == CHAR_MINUS)
882 {
883 negated = TRUE;
884 ptr++;
885 }
886 else negated = FALSE;
887
888 /* The integer range is limited by the machine's int representation. */
889 c = 0;
890 while (IS_DIGIT(ptr[1]))
891 {
892 if (((unsigned int)c) > INT_MAX / 10) /* Integer overflow */
893 {
894 c = -1;
895 break;
896 }
897 c = c * 10 + *(++ptr) - CHAR_0;
898 }
899 if (((unsigned int)c) > INT_MAX) /* Integer overflow */
900 {
901 while (IS_DIGIT(ptr[1]))
902 ptr++;
903 *errorcodeptr = ERR61;
904 break;
905 }
906
907 if (braced && *(++ptr) != CHAR_RIGHT_CURLY_BRACKET)
908 {
909 *errorcodeptr = ERR57;
910 break;
911 }
912
913 if (c == 0)
914 {
915 *errorcodeptr = ERR58;
916 break;
917 }
918
919 if (negated)
920 {
921 if (c > bracount)
922 {
923 *errorcodeptr = ERR15;
924 break;
925 }
926 c = bracount - (c - 1);
927 }
928
929 c = -(ESC_REF + c);
930 break;
931
932 /* The handling of escape sequences consisting of a string of digits
933 starting with one that is not zero is not straightforward. By experiment,
934 the way Perl works seems to be as follows:
935
936 Outside a character class, the digits are read as a decimal number. If the
937 number is less than 10, or if there are that many previous extracting
938 left brackets, then it is a back reference. Otherwise, up to three octal
939 digits are read to form an escaped byte. Thus \123 is likely to be octal
940 123 (cf \0123, which is octal 012 followed by the literal 3). If the octal
941 value is greater than 377, the least significant 8 bits are taken. Inside a
942 character class, \ followed by a digit is always an octal number. */
943
944 case CHAR_1: case CHAR_2: case CHAR_3: case CHAR_4: case CHAR_5:
945 case CHAR_6: case CHAR_7: case CHAR_8: case CHAR_9:
946
947 if (!isclass)
948 {
949 oldptr = ptr;
950 /* The integer range is limited by the machine's int representation. */
951 c -= CHAR_0;
952 while (IS_DIGIT(ptr[1]))
953 {
954 if (((unsigned int)c) > INT_MAX / 10) /* Integer overflow */
955 {
956 c = -1;
957 break;
958 }
959 c = c * 10 + *(++ptr) - CHAR_0;
960 }
961 if (((unsigned int)c) > INT_MAX) /* Integer overflow */
962 {
963 while (IS_DIGIT(ptr[1]))
964 ptr++;
965 *errorcodeptr = ERR61;
966 break;
967 }
968 if (c < 10 || c <= bracount)
969 {
970 c = -(ESC_REF + c);
971 break;
972 }
973 ptr = oldptr; /* Put the pointer back and fall through */
974 }
975
976 /* Handle an octal number following \. If the first digit is 8 or 9, Perl
977 generates a binary zero byte and treats the digit as a following literal.
978 Thus we have to pull back the pointer by one. */
979
980 if ((c = *ptr) >= CHAR_8)
981 {
982 ptr--;
983 c = 0;
984 break;
985 }
986
987 /* \0 always starts an octal number, but we may drop through to here with a
988 larger first octal digit. The original code used just to take the least
989 significant 8 bits of octal numbers (I think this is what early Perls used
990 to do). Nowadays we allow for larger numbers in UTF-8 mode, but no more
991 than 3 octal digits. */
992
993 case CHAR_0:
994 c -= CHAR_0;
995 while(i++ < 2 && ptr[1] >= CHAR_0 && ptr[1] <= CHAR_7)
996 c = c * 8 + *(++ptr) - CHAR_0;
997 if (!utf && c > 0xff) *errorcodeptr = ERR51;
998 break;
999
1000 /* \x is complicated. \x{ddd} is a character number which can be greater
1001 than 0xff in utf or non-8bit mode, but only if the ddd are hex digits.
1002 If not, { is treated as a data character. */
1003
1004 case CHAR_x:
1005 if ((options & PCRE_JAVASCRIPT_COMPAT) != 0)
1006 {
1007 /* In JavaScript, \x must be followed by two hexadecimal numbers.
1008 Otherwise it is a lowercase x letter. */
1009 if (MAX_255(ptr[1]) && (digitab[ptr[1]] & ctype_xdigit) != 0
1010 && MAX_255(ptr[2]) && (digitab[ptr[2]] & ctype_xdigit) != 0)
1011 {
1012 c = 0;
1013 for (i = 0; i < 2; ++i)
1014 {
1015 register int cc = *(++ptr);
1016 #ifndef EBCDIC /* ASCII/UTF-8 coding */
1017 if (cc >= CHAR_a) cc -= 32; /* Convert to upper case */
1018 c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
1019 #else /* EBCDIC coding */
1020 if (cc >= CHAR_a && cc <= CHAR_z) cc += 64; /* Convert to upper case */
1021 c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
1022 #endif
1023 }
1024 }
1025 break;
1026 }
1027
1028 if (ptr[1] == CHAR_LEFT_CURLY_BRACKET)
1029 {
1030 const pcre_uchar *pt = ptr + 2;
1031
1032 c = 0;
1033 while (MAX_255(*pt) && (digitab[*pt] & ctype_xdigit) != 0)
1034 {
1035 register int cc = *pt++;
1036 if (c == 0 && cc == CHAR_0) continue; /* Leading zeroes */
1037
1038 #ifndef EBCDIC /* ASCII/UTF-8 coding */
1039 if (cc >= CHAR_a) cc -= 32; /* Convert to upper case */
1040 c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
1041 #else /* EBCDIC coding */
1042 if (cc >= CHAR_a && cc <= CHAR_z) cc += 64; /* Convert to upper case */
1043 c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
1044 #endif
1045
1046 #ifdef COMPILE_PCRE8
1047 if (c > (utf ? 0x10ffff : 0xff)) { c = -1; break; }
1048 #else
1049 #ifdef COMPILE_PCRE16
1050 if (c > (utf ? 0x10ffff : 0xffff)) { c = -1; break; }
1051 #endif
1052 #endif
1053 }
1054
1055 if (c < 0)
1056 {
1057 while (MAX_255(*pt) && (digitab[*pt] & ctype_xdigit) != 0) pt++;
1058 *errorcodeptr = ERR34;
1059 }
1060
1061 if (*pt == CHAR_RIGHT_CURLY_BRACKET)
1062 {
1063 if (utf && c >= 0xd800 && c <= 0xdfff) *errorcodeptr = ERR73;
1064 ptr = pt;
1065 break;
1066 }
1067
1068 /* If the sequence of hex digits does not end with '}', then we don't
1069 recognize this construct; fall through to the normal \x handling. */
1070 }
1071
1072 /* Read just a single-byte hex-defined char */
1073
1074 c = 0;
1075 while (i++ < 2 && MAX_255(ptr[1]) && (digitab[ptr[1]] & ctype_xdigit) != 0)
1076 {
1077 int cc; /* Some compilers don't like */
1078 cc = *(++ptr); /* ++ in initializers */
1079 #ifndef EBCDIC /* ASCII/UTF-8 coding */
1080 if (cc >= CHAR_a) cc -= 32; /* Convert to upper case */
1081 c = c * 16 + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
1082 #else /* EBCDIC coding */
1083 if (cc <= CHAR_z) cc += 64; /* Convert to upper case */
1084 c = c * 16 + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
1085 #endif
1086 }
1087 break;
1088
1089 /* For \c, a following letter is upper-cased; then the 0x40 bit is flipped.
1090 An error is given if the byte following \c is not an ASCII character. This
1091 coding is ASCII-specific, but then the whole concept of \cx is
1092 ASCII-specific. (However, an EBCDIC equivalent has now been added.) */
1093
1094 case CHAR_c:
1095 c = *(++ptr);
1096 if (c == 0)
1097 {
1098 *errorcodeptr = ERR2;
1099 break;
1100 }
1101 #ifndef EBCDIC /* ASCII/UTF-8 coding */
1102 if (c > 127) /* Excludes all non-ASCII in either mode */
1103 {
1104 *errorcodeptr = ERR68;
1105 break;
1106 }
1107 if (c >= CHAR_a && c <= CHAR_z) c -= 32;
1108 c ^= 0x40;
1109 #else /* EBCDIC coding */
1110 if (c >= CHAR_a && c <= CHAR_z) c += 64;
1111 c ^= 0xC0;
1112 #endif
1113 break;
1114
1115 /* PCRE_EXTRA enables extensions to Perl in the matter of escapes. Any
1116 other alphanumeric following \ is an error if PCRE_EXTRA was set;
1117 otherwise, for Perl compatibility, it is a literal. This code looks a bit
1118 odd, but there used to be some cases other than the default, and there may
1119 be again in future, so I haven't "optimized" it. */
1120
1121 default:
1122 if ((options & PCRE_EXTRA) != 0) switch(c)
1123 {
1124 default:
1125 *errorcodeptr = ERR3;
1126 break;
1127 }
1128 break;
1129 }
1130 }
1131
1132 /* Perl supports \N{name} for character names, as well as plain \N for "not
1133 newline". PCRE does not support \N{name}. However, it does support
1134 quantification such as \N{2,3}. */
1135
1136 if (c == -ESC_N && ptr[1] == CHAR_LEFT_CURLY_BRACKET &&
1137 !is_counted_repeat(ptr+2))
1138 *errorcodeptr = ERR37;
1139
1140 /* If PCRE_UCP is set, we change the values for \d etc. */
1141
1142 if ((options & PCRE_UCP) != 0 && c <= -ESC_D && c >= -ESC_w)
1143 c -= (ESC_DU - ESC_D);
1144
1145 /* Set the pointer to the final character before returning. */
1146
1147 *ptrptr = ptr;
1148 return c;
1149 }
1150
1151
1152
1153 #ifdef SUPPORT_UCP
1154 /*************************************************
1155 * Handle \P and \p *
1156 *************************************************/
1157
1158 /* This function is called after \P or \p has been encountered, provided that
1159 PCRE is compiled with support for Unicode properties. On entry, ptrptr is
1160 pointing at the P or p. On exit, it is pointing at the final character of the
1161 escape sequence.
1162
1163 Argument:
1164 ptrptr points to the pattern position pointer
1165 negptr points to a boolean that is set TRUE for negation else FALSE
1166 dptr points to an int that is set to the detailed property value
1167 errorcodeptr points to the error code variable
1168
1169 Returns: type value from ucp_type_table, or -1 for an invalid type
1170 */
1171
1172 static int
1173 get_ucp(const pcre_uchar **ptrptr, BOOL *negptr, int *dptr, int *errorcodeptr)
1174 {
1175 int c, i, bot, top;
1176 const pcre_uchar *ptr = *ptrptr;
1177 pcre_uchar name[32];
1178
1179 c = *(++ptr);
1180 if (c == 0) goto ERROR_RETURN;
1181
1182 *negptr = FALSE;
1183
1184 /* \P or \p can be followed by a name in {}, optionally preceded by ^ for
1185 negation. */
1186
1187 if (c == CHAR_LEFT_CURLY_BRACKET)
1188 {
1189 if (ptr[1] == CHAR_CIRCUMFLEX_ACCENT)
1190 {
1191 *negptr = TRUE;
1192 ptr++;
1193 }
1194 for (i = 0; i < (int)sizeof(name) - 1; i++)
1195 {
1196 c = *(++ptr);
1197 if (c == 0) goto ERROR_RETURN;
1198 if (c == CHAR_RIGHT_CURLY_BRACKET) break;
1199 name[i] = c;
1200 }
1201 if (c != CHAR_RIGHT_CURLY_BRACKET) goto ERROR_RETURN;
1202 name[i] = 0;
1203 }
1204
1205 /* Otherwise there is just one following character */
1206
1207 else
1208 {
1209 name[0] = c;
1210 name[1] = 0;
1211 }
1212
1213 *ptrptr = ptr;
1214
1215 /* Search for a recognized property name using binary chop */
1216
1217 bot = 0;
1218 top = PRIV(utt_size);
1219
1220 while (bot < top)
1221 {
1222 i = (bot + top) >> 1;
1223 c = STRCMP_UC_C8(name, PRIV(utt_names) + PRIV(utt)[i].name_offset);
1224 if (c == 0)
1225 {
1226 *dptr = PRIV(utt)[i].value;
1227 return PRIV(utt)[i].type;
1228 }
1229 if (c > 0) bot = i + 1; else top = i;
1230 }
1231
1232 *errorcodeptr = ERR47;
1233 *ptrptr = ptr;
1234 return -1;
1235
1236 ERROR_RETURN:
1237 *errorcodeptr = ERR46;
1238 *ptrptr = ptr;
1239 return -1;
1240 }
1241 #endif
1242
1243
1244
1245
1246 /*************************************************
1247 * Read repeat counts *
1248 *************************************************/
1249
1250 /* Read an item of the form {n,m} and return the values. This is called only
1251 after is_counted_repeat() has confirmed that a repeat-count quantifier exists,
1252 so the syntax is guaranteed to be correct, but we need to check the values.
1253
1254 Arguments:
1255 p pointer to first char after '{'
1256 minp pointer to int for min
1257 maxp pointer to int for max
1258 returned as -1 if no max
1259 errorcodeptr points to error code variable
1260
1261 Returns: pointer to '}' on success;
1262 current ptr on error, with errorcodeptr set non-zero
1263 */
1264
1265 static const pcre_uchar *
1266 read_repeat_counts(const pcre_uchar *p, int *minp, int *maxp, int *errorcodeptr)
1267 {
1268 int min = 0;
1269 int max = -1;
1270
1271 /* Read the minimum value and do a paranoid check: a negative value indicates
1272 an integer overflow. */
1273
1274 while (IS_DIGIT(*p)) min = min * 10 + *p++ - CHAR_0;
1275 if (min < 0 || min > 65535)
1276 {
1277 *errorcodeptr = ERR5;
1278 return p;
1279 }
1280
1281 /* Read the maximum value if there is one, and again do a paranoid on its size.
1282 Also, max must not be less than min. */
1283
1284 if (*p == CHAR_RIGHT_CURLY_BRACKET) max = min; else
1285 {
1286 if (*(++p) != CHAR_RIGHT_CURLY_BRACKET)
1287 {
1288 max = 0;
1289 while(IS_DIGIT(*p)) max = max * 10 + *p++ - CHAR_0;
1290 if (max < 0 || max > 65535)
1291 {
1292 *errorcodeptr = ERR5;
1293 return p;
1294 }
1295 if (max < min)
1296 {
1297 *errorcodeptr = ERR4;
1298 return p;
1299 }
1300 }
1301 }
1302
1303 /* Fill in the required variables, and pass back the pointer to the terminating
1304 '}'. */
1305
1306 *minp = min;
1307 *maxp = max;
1308 return p;
1309 }
1310
1311
1312
1313 /*************************************************
1314 * Subroutine for finding forward reference *
1315 *************************************************/
1316
1317 /* This recursive function is called only from find_parens() below. The
1318 top-level call starts at the beginning of the pattern. All other calls must
1319 start at a parenthesis. It scans along a pattern's text looking for capturing
1320 subpatterns, and counting them. If it finds a named pattern that matches the
1321 name it is given, it returns its number. Alternatively, if the name is NULL, it
1322 returns when it reaches a given numbered subpattern. Recursion is used to keep
1323 track of subpatterns that reset the capturing group numbers - the (?| feature.
1324
1325 This function was originally called only from the second pass, in which we know
1326 that if (?< or (?' or (?P< is encountered, the name will be correctly
1327 terminated because that is checked in the first pass. There is now one call to
1328 this function in the first pass, to check for a recursive back reference by
1329 name (so that we can make the whole group atomic). In this case, we need check
1330 only up to the current position in the pattern, and that is still OK because
1331 and previous occurrences will have been checked. To make this work, the test
1332 for "end of pattern" is a check against cd->end_pattern in the main loop,
1333 instead of looking for a binary zero. This means that the special first-pass
1334 call can adjust cd->end_pattern temporarily. (Checks for binary zero while
1335 processing items within the loop are OK, because afterwards the main loop will
1336 terminate.)
1337
1338 Arguments:
1339 ptrptr address of the current character pointer (updated)
1340 cd compile background data
1341 name name to seek, or NULL if seeking a numbered subpattern
1342 lorn name length, or subpattern number if name is NULL
1343 xmode TRUE if we are in /x mode
1344 utf TRUE if we are in UTF-8 / UTF-16 mode
1345 count pointer to the current capturing subpattern number (updated)
1346
1347 Returns: the number of the named subpattern, or -1 if not found
1348 */
1349
1350 static int
1351 find_parens_sub(pcre_uchar **ptrptr, compile_data *cd, const pcre_uchar *name, int lorn,
1352 BOOL xmode, BOOL utf, int *count)
1353 {
1354 pcre_uchar *ptr = *ptrptr;
1355 int start_count = *count;
1356 int hwm_count = start_count;
1357 BOOL dup_parens = FALSE;
1358
1359 /* If the first character is a parenthesis, check on the type of group we are
1360 dealing with. The very first call may not start with a parenthesis. */
1361
1362 if (ptr[0] == CHAR_LEFT_PARENTHESIS)
1363 {
1364 /* Handle specials such as (*SKIP) or (*UTF8) etc. */
1365
1366 if (ptr[1] == CHAR_ASTERISK) ptr += 2;
1367
1368 /* Handle a normal, unnamed capturing parenthesis. */
1369
1370 else if (ptr[1] != CHAR_QUESTION_MARK)
1371 {
1372 *count += 1;
1373 if (name == NULL && *count == lorn) return *count;
1374 ptr++;
1375 }
1376
1377 /* All cases now have (? at the start. Remember when we are in a group
1378 where the parenthesis numbers are duplicated. */
1379
1380 else if (ptr[2] == CHAR_VERTICAL_LINE)
1381 {
1382 ptr += 3;
1383 dup_parens = TRUE;
1384 }
1385
1386 /* Handle comments; all characters are allowed until a ket is reached. */
1387
1388 else if (ptr[2] == CHAR_NUMBER_SIGN)
1389 {
1390 for (ptr += 3; *ptr != 0; ptr++) if (*ptr == CHAR_RIGHT_PARENTHESIS) break;
1391 goto FAIL_EXIT;
1392 }
1393
1394 /* Handle a condition. If it is an assertion, just carry on so that it
1395 is processed as normal. If not, skip to the closing parenthesis of the
1396 condition (there can't be any nested parens). */
1397
1398 else if (ptr[2] == CHAR_LEFT_PARENTHESIS)
1399 {
1400 ptr += 2;
1401 if (ptr[1] != CHAR_QUESTION_MARK)
1402 {
1403 while (*ptr != 0 && *ptr != CHAR_RIGHT_PARENTHESIS) ptr++;
1404 if (*ptr != 0) ptr++;
1405 }
1406 }
1407
1408 /* Start with (? but not a condition. */
1409
1410 else
1411 {
1412 ptr += 2;
1413 if (*ptr == CHAR_P) ptr++; /* Allow optional P */
1414
1415 /* We have to disambiguate (?<! and (?<= from (?<name> for named groups */
1416
1417 if ((*ptr == CHAR_LESS_THAN_SIGN && ptr[1] != CHAR_EXCLAMATION_MARK &&
1418 ptr[1] != CHAR_EQUALS_SIGN) || *ptr == CHAR_APOSTROPHE)
1419 {
1420 int term;
1421 const pcre_uchar *thisname;
1422 *count += 1;
1423 if (name == NULL && *count == lorn) return *count;
1424 term = *ptr++;
1425 if (term == CHAR_LESS_THAN_SIGN) term = CHAR_GREATER_THAN_SIGN;
1426 thisname = ptr;
1427 while (*ptr != term) ptr++;
1428 if (name != NULL && lorn == ptr - thisname &&
1429 STRNCMP_UC_UC(name, thisname, lorn) == 0)
1430 return *count;
1431 term++;
1432 }
1433 }
1434 }
1435
1436 /* Past any initial parenthesis handling, scan for parentheses or vertical
1437 bars. Stop if we get to cd->end_pattern. Note that this is important for the
1438 first-pass call when this value is temporarily adjusted to stop at the current
1439 position. So DO NOT change this to a test for binary zero. */
1440
1441 for (; ptr < cd->end_pattern; ptr++)
1442 {
1443 /* Skip over backslashed characters and also entire \Q...\E */
1444
1445 if (*ptr == CHAR_BACKSLASH)
1446 {
1447 if (*(++ptr) == 0) goto FAIL_EXIT;
1448 if (*ptr == CHAR_Q) for (;;)
1449 {
1450 while (*(++ptr) != 0 && *ptr != CHAR_BACKSLASH) {};
1451 if (*ptr == 0) goto FAIL_EXIT;
1452 if (*(++ptr) == CHAR_E) break;
1453 }
1454 continue;
1455 }
1456
1457 /* Skip over character classes; this logic must be similar to the way they
1458 are handled for real. If the first character is '^', skip it. Also, if the
1459 first few characters (either before or after ^) are \Q\E or \E we skip them
1460 too. This makes for compatibility with Perl. Note the use of STR macros to
1461 encode "Q\\E" so that it works in UTF-8 on EBCDIC platforms. */
1462
1463 if (*ptr == CHAR_LEFT_SQUARE_BRACKET)
1464 {
1465 BOOL negate_class = FALSE;
1466 for (;;)
1467 {
1468 if (ptr[1] == CHAR_BACKSLASH)
1469 {
1470 if (ptr[2] == CHAR_E)
1471 ptr+= 2;
1472 else if (STRNCMP_UC_C8(ptr + 2,
1473 STR_Q STR_BACKSLASH STR_E, 3) == 0)
1474 ptr += 4;
1475 else
1476 break;
1477 }
1478 else if (!negate_class && ptr[1] == CHAR_CIRCUMFLEX_ACCENT)
1479 {
1480 negate_class = TRUE;
1481 ptr++;
1482 }
1483 else break;
1484 }
1485
1486 /* If the next character is ']', it is a data character that must be
1487 skipped, except in JavaScript compatibility mode. */
1488
1489 if (ptr[1] == CHAR_RIGHT_SQUARE_BRACKET &&
1490 (cd->external_options & PCRE_JAVASCRIPT_COMPAT) == 0)
1491 ptr++;
1492
1493 while (*(++ptr) != CHAR_RIGHT_SQUARE_BRACKET)
1494 {
1495 if (*ptr == 0) return -1;
1496 if (*ptr == CHAR_BACKSLASH)
1497 {
1498 if (*(++ptr) == 0) goto FAIL_EXIT;
1499 if (*ptr == CHAR_Q) for (;;)
1500 {
1501 while (*(++ptr) != 0 && *ptr != CHAR_BACKSLASH) {};
1502 if (*ptr == 0) goto FAIL_EXIT;
1503 if (*(++ptr) == CHAR_E) break;
1504 }
1505 continue;
1506 }
1507 }
1508 continue;
1509 }
1510
1511 /* Skip comments in /x mode */
1512
1513 if (xmode && *ptr == CHAR_NUMBER_SIGN)
1514 {
1515 ptr++;
1516 while (*ptr != 0)
1517 {
1518 if (IS_NEWLINE(ptr)) { ptr += cd->nllen - 1; break; }
1519 ptr++;
1520 #ifdef SUPPORT_UTF
1521 if (utf) FORWARDCHAR(ptr);
1522 #endif
1523 }
1524 if (*ptr == 0) goto FAIL_EXIT;
1525 continue;
1526 }
1527
1528 /* Check for the special metacharacters */
1529
1530 if (*ptr == CHAR_LEFT_PARENTHESIS)
1531 {
1532 int rc = find_parens_sub(&ptr, cd, name, lorn, xmode, utf, count);
1533 if (rc > 0) return rc;
1534 if (*ptr == 0) goto FAIL_EXIT;
1535 }
1536
1537 else if (*ptr == CHAR_RIGHT_PARENTHESIS)
1538 {
1539 if (dup_parens && *count < hwm_count) *count = hwm_count;
1540 goto FAIL_EXIT;
1541 }
1542
1543 else if (*ptr == CHAR_VERTICAL_LINE && dup_parens)
1544 {
1545 if (*count > hwm_count) hwm_count = *count;
1546 *count = start_count;
1547 }
1548 }
1549
1550 FAIL_EXIT:
1551 *ptrptr = ptr;
1552 return -1;
1553 }
1554
1555
1556
1557
1558 /*************************************************
1559 * Find forward referenced subpattern *
1560 *************************************************/
1561
1562 /* This function scans along a pattern's text looking for capturing
1563 subpatterns, and counting them. If it finds a named pattern that matches the
1564 name it is given, it returns its number. Alternatively, if the name is NULL, it
1565 returns when it reaches a given numbered subpattern. This is used for forward
1566 references to subpatterns. We used to be able to start this scan from the
1567 current compiling point, using the current count value from cd->bracount, and
1568 do it all in a single loop, but the addition of the possibility of duplicate
1569 subpattern numbers means that we have to scan from the very start, in order to
1570 take account of such duplicates, and to use a recursive function to keep track
1571 of the different types of group.
1572
1573 Arguments:
1574 cd compile background data
1575 name name to seek, or NULL if seeking a numbered subpattern
1576 lorn name length, or subpattern number if name is NULL
1577 xmode TRUE if we are in /x mode
1578 utf TRUE if we are in UTF-8 / UTF-16 mode
1579
1580 Returns: the number of the found subpattern, or -1 if not found
1581 */
1582
1583 static int
1584 find_parens(compile_data *cd, const pcre_uchar *name, int lorn, BOOL xmode,
1585 BOOL utf)
1586 {
1587 pcre_uchar *ptr = (pcre_uchar *)cd->start_pattern;
1588 int count = 0;
1589 int rc;
1590
1591 /* If the pattern does not start with an opening parenthesis, the first call
1592 to find_parens_sub() will scan right to the end (if necessary). However, if it
1593 does start with a parenthesis, find_parens_sub() will return when it hits the
1594 matching closing parens. That is why we have to have a loop. */
1595
1596 for (;;)
1597 {
1598 rc = find_parens_sub(&ptr, cd, name, lorn, xmode, utf, &count);
1599 if (rc > 0 || *ptr++ == 0) break;
1600 }
1601
1602 return rc;
1603 }
1604
1605
1606
1607
1608 /*************************************************
1609 * Find first significant op code *
1610 *************************************************/
1611
1612 /* This is called by several functions that scan a compiled expression looking
1613 for a fixed first character, or an anchoring op code etc. It skips over things
1614 that do not influence this. For some calls, it makes sense to skip negative
1615 forward and all backward assertions, and also the \b assertion; for others it
1616 does not.
1617
1618 Arguments:
1619 code pointer to the start of the group
1620 skipassert TRUE if certain assertions are to be skipped
1621
1622 Returns: pointer to the first significant opcode
1623 */
1624
1625 static const pcre_uchar*
1626 first_significant_code(const pcre_uchar *code, BOOL skipassert)
1627 {
1628 for (;;)
1629 {
1630 switch ((int)*code)
1631 {
1632 case OP_ASSERT_NOT:
1633 case OP_ASSERTBACK:
1634 case OP_ASSERTBACK_NOT:
1635 if (!skipassert) return code;
1636 do code += GET(code, 1); while (*code == OP_ALT);
1637 code += PRIV(OP_lengths)[*code];
1638 break;
1639
1640 case OP_WORD_BOUNDARY:
1641 case OP_NOT_WORD_BOUNDARY:
1642 if (!skipassert) return code;
1643 /* Fall through */
1644
1645 case OP_CALLOUT:
1646 case OP_CREF:
1647 case OP_NCREF:
1648 case OP_RREF:
1649 case OP_NRREF:
1650 case OP_DEF:
1651 code += PRIV(OP_lengths)[*code];
1652 break;
1653
1654 default:
1655 return code;
1656 }
1657 }
1658 /* Control never reaches here */
1659 }
1660
1661
1662
1663
1664 /*************************************************
1665 * Find the fixed length of a branch *
1666 *************************************************/
1667
1668 /* Scan a branch and compute the fixed length of subject that will match it,
1669 if the length is fixed. This is needed for dealing with backward assertions.
1670 In UTF8 mode, the result is in characters rather than bytes. The branch is
1671 temporarily terminated with OP_END when this function is called.
1672
1673 This function is called when a backward assertion is encountered, so that if it
1674 fails, the error message can point to the correct place in the pattern.
1675 However, we cannot do this when the assertion contains subroutine calls,
1676 because they can be forward references. We solve this by remembering this case
1677 and doing the check at the end; a flag specifies which mode we are running in.
1678
1679 Arguments:
1680 code points to the start of the pattern (the bracket)
1681 utf TRUE in UTF-8 / UTF-16 mode
1682 atend TRUE if called when the pattern is complete
1683 cd the "compile data" structure
1684
1685 Returns: the fixed length,
1686 or -1 if there is no fixed length,
1687 or -2 if \C was encountered (in UTF-8 mode only)
1688 or -3 if an OP_RECURSE item was encountered and atend is FALSE
1689 or -4 if an unknown opcode was encountered (internal error)
1690 */
1691
1692 static int
1693 find_fixedlength(pcre_uchar *code, BOOL utf, BOOL atend, compile_data *cd)
1694 {
1695 int length = -1;
1696
1697 register int branchlength = 0;
1698 register pcre_uchar *cc = code + 1 + LINK_SIZE;
1699
1700 /* Scan along the opcodes for this branch. If we get to the end of the
1701 branch, check the length against that of the other branches. */
1702
1703 for (;;)
1704 {
1705 int d;
1706 pcre_uchar *ce, *cs;
1707 register int op = *cc;
1708 switch (op)
1709 {
1710 /* We only need to continue for OP_CBRA (normal capturing bracket) and
1711 OP_BRA (normal non-capturing bracket) because the other variants of these
1712 opcodes are all concerned with unlimited repeated groups, which of course
1713 are not of fixed length. */
1714
1715 case OP_CBRA:
1716 case OP_BRA:
1717 case OP_ONCE:
1718 case OP_ONCE_NC:
1719 case OP_COND:
1720 d = find_fixedlength(cc + ((op == OP_CBRA)? IMM2_SIZE : 0), utf, atend, cd);
1721 if (d < 0) return d;
1722 branchlength += d;
1723 do cc += GET(cc, 1); while (*cc == OP_ALT);
1724 cc += 1 + LINK_SIZE;
1725 break;
1726
1727 /* Reached end of a branch; if it's a ket it is the end of a nested call.
1728 If it's ALT it is an alternation in a nested call. An ACCEPT is effectively
1729 an ALT. If it is END it's the end of the outer call. All can be handled by
1730 the same code. Note that we must not include the OP_KETRxxx opcodes here,
1731 because they all imply an unlimited repeat. */
1732
1733 case OP_ALT:
1734 case OP_KET:
1735 case OP_END:
1736 case OP_ACCEPT:
1737 case OP_ASSERT_ACCEPT:
1738 if (length < 0) length = branchlength;
1739 else if (length != branchlength) return -1;
1740 if (*cc != OP_ALT) return length;
1741 cc += 1 + LINK_SIZE;
1742 branchlength = 0;
1743 break;
1744
1745 /* A true recursion implies not fixed length, but a subroutine call may
1746 be OK. If the subroutine is a forward reference, we can't deal with
1747 it until the end of the pattern, so return -3. */
1748
1749 case OP_RECURSE:
1750 if (!atend) return -3;
1751 cs = ce = (pcre_uchar *)cd->start_code + GET(cc, 1); /* Start subpattern */
1752 do ce += GET(ce, 1); while (*ce == OP_ALT); /* End subpattern */
1753 if (cc > cs && cc < ce) return -1; /* Recursion */
1754 d = find_fixedlength(cs + 2, utf, atend, cd);
1755 if (d < 0) return d;
1756 branchlength += d;
1757 cc += 1 + LINK_SIZE;
1758 break;
1759
1760 /* Skip over assertive subpatterns */
1761
1762 case OP_ASSERT:
1763 case OP_ASSERT_NOT:
1764 case OP_ASSERTBACK:
1765 case OP_ASSERTBACK_NOT:
1766 do cc += GET(cc, 1); while (*cc == OP_ALT);
1767 /* Fall through */
1768
1769 /* Skip over things that don't match chars */
1770
1771 case OP_MARK:
1772 case OP_PRUNE_ARG:
1773 case OP_SKIP_ARG:
1774 case OP_THEN_ARG:
1775 cc += cc[1] + PRIV(OP_lengths)[*cc];
1776 break;
1777
1778 case OP_CALLOUT:
1779 case OP_CIRC:
1780 case OP_CIRCM:
1781 case OP_CLOSE:
1782 case OP_COMMIT:
1783 case OP_CREF:
1784 case OP_DEF:
1785 case OP_DOLL:
1786 case OP_DOLLM:
1787 case OP_EOD:
1788 case OP_EODN:
1789 case OP_FAIL:
1790 case OP_NCREF:
1791 case OP_NRREF:
1792 case OP_NOT_WORD_BOUNDARY:
1793 case OP_PRUNE:
1794 case OP_REVERSE:
1795 case OP_RREF:
1796 case OP_SET_SOM:
1797 case OP_SKIP:
1798 case OP_SOD:
1799 case OP_SOM:
1800 case OP_THEN:
1801 case OP_WORD_BOUNDARY:
1802 cc += PRIV(OP_lengths)[*cc];
1803 break;
1804
1805 /* Handle literal characters */
1806
1807 case OP_CHAR:
1808 case OP_CHARI:
1809 case OP_NOT:
1810 case OP_NOTI:
1811 branchlength++;
1812 cc += 2;
1813 #ifdef SUPPORT_UTF
1814 if (utf && HAS_EXTRALEN(cc[-1])) cc += GET_EXTRALEN(cc[-1]);
1815 #endif
1816 break;
1817
1818 /* Handle exact repetitions. The count is already in characters, but we
1819 need to skip over a multibyte character in UTF8 mode. */
1820
1821 case OP_EXACT:
1822 case OP_EXACTI:
1823 case OP_NOTEXACT:
1824 case OP_NOTEXACTI:
1825 branchlength += GET2(cc,1);
1826 cc += 2 + IMM2_SIZE;
1827 #ifdef SUPPORT_UTF
1828 if (utf && HAS_EXTRALEN(cc[-1])) cc += GET_EXTRALEN(cc[-1]);
1829 #endif
1830 break;
1831
1832 case OP_TYPEEXACT:
1833 branchlength += GET2(cc,1);
1834 if (cc[1 + IMM2_SIZE] == OP_PROP || cc[1 + IMM2_SIZE] == OP_NOTPROP) cc += 2;
1835 cc += 1 + IMM2_SIZE + 1;
1836 break;
1837
1838 /* Handle single-char matchers */
1839
1840 case OP_PROP:
1841 case OP_NOTPROP:
1842 cc += 2;
1843 /* Fall through */
1844
1845 case OP_HSPACE:
1846 case OP_VSPACE:
1847 case OP_NOT_HSPACE:
1848 case OP_NOT_VSPACE:
1849 case OP_NOT_DIGIT:
1850 case OP_DIGIT:
1851 case OP_NOT_WHITESPACE:
1852 case OP_WHITESPACE:
1853 case OP_NOT_WORDCHAR:
1854 case OP_WORDCHAR:
1855 case OP_ANY:
1856 case OP_ALLANY:
1857 branchlength++;
1858 cc++;
1859 break;
1860
1861 /* The single-byte matcher isn't allowed. This only happens in UTF-8 mode;
1862 otherwise \C is coded as OP_ALLANY. */
1863
1864 case OP_ANYBYTE:
1865 return -2;
1866
1867 /* Check a class for variable quantification */
1868
1869 #if defined SUPPORT_UTF || defined COMPILE_PCRE16
1870 case OP_XCLASS:
1871 cc += GET(cc, 1) - PRIV(OP_lengths)[OP_CLASS];
1872 /* Fall through */
1873 #endif
1874
1875 case OP_CLASS:
1876 case OP_NCLASS:
1877 cc += PRIV(OP_lengths)[OP_CLASS];
1878
1879 switch (*cc)
1880 {
1881 case OP_CRPLUS:
1882 case OP_CRMINPLUS:
1883 case OP_CRSTAR:
1884 case OP_CRMINSTAR:
1885 case OP_CRQUERY:
1886 case OP_CRMINQUERY:
1887 return -1;
1888
1889 case OP_CRRANGE:
1890 case OP_CRMINRANGE:
1891 if (GET2(cc,1) != GET2(cc,1+IMM2_SIZE)) return -1;
1892 branchlength += GET2(cc,1);
1893 cc += 1 + 2 * IMM2_SIZE;
1894 break;
1895
1896 default:
1897 branchlength++;
1898 }
1899 break;
1900
1901 /* Anything else is variable length */
1902
1903 case OP_ANYNL:
1904 case OP_BRAMINZERO:
1905 case OP_BRAPOS:
1906 case OP_BRAPOSZERO:
1907 case OP_BRAZERO:
1908 case OP_CBRAPOS:
1909 case OP_EXTUNI:
1910 case OP_KETRMAX:
1911 case OP_KETRMIN:
1912 case OP_KETRPOS:
1913 case OP_MINPLUS:
1914 case OP_MINPLUSI:
1915 case OP_MINQUERY:
1916 case OP_MINQUERYI:
1917 case OP_MINSTAR:
1918 case OP_MINSTARI:
1919 case OP_MINUPTO:
1920 case OP_MINUPTOI:
1921 case OP_NOTMINPLUS:
1922 case OP_NOTMINPLUSI:
1923 case OP_NOTMINQUERY:
1924 case OP_NOTMINQUERYI:
1925 case OP_NOTMINSTAR:
1926 case OP_NOTMINSTARI:
1927 case OP_NOTMINUPTO:
1928 case OP_NOTMINUPTOI:
1929 case OP_NOTPLUS:
1930 case OP_NOTPLUSI:
1931 case OP_NOTPOSPLUS:
1932 case OP_NOTPOSPLUSI:
1933 case OP_NOTPOSQUERY:
1934 case OP_NOTPOSQUERYI:
1935 case OP_NOTPOSSTAR:
1936 case OP_NOTPOSSTARI:
1937 case OP_NOTPOSUPTO:
1938 case OP_NOTPOSUPTOI:
1939 case OP_NOTQUERY:
1940 case OP_NOTQUERYI:
1941 case OP_NOTSTAR:
1942 case OP_NOTSTARI:
1943 case OP_NOTUPTO:
1944 case OP_NOTUPTOI:
1945 case OP_PLUS:
1946 case OP_PLUSI:
1947 case OP_POSPLUS:
1948 case OP_POSPLUSI:
1949 case OP_POSQUERY:
1950 case OP_POSQUERYI:
1951 case OP_POSSTAR:
1952 case OP_POSSTARI:
1953 case OP_POSUPTO:
1954 case OP_POSUPTOI:
1955 case OP_QUERY:
1956 case OP_QUERYI:
1957 case OP_REF:
1958 case OP_REFI:
1959 case OP_SBRA:
1960 case OP_SBRAPOS:
1961 case OP_SCBRA:
1962 case OP_SCBRAPOS:
1963 case OP_SCOND:
1964 case OP_SKIPZERO:
1965 case OP_STAR:
1966 case OP_STARI:
1967 case OP_TYPEMINPLUS:
1968 case OP_TYPEMINQUERY:
1969 case OP_TYPEMINSTAR:
1970 case OP_TYPEMINUPTO:
1971 case OP_TYPEPLUS:
1972 case OP_TYPEPOSPLUS:
1973 case OP_TYPEPOSQUERY:
1974 case OP_TYPEPOSSTAR:
1975 case OP_TYPEPOSUPTO:
1976 case OP_TYPEQUERY:
1977 case OP_TYPESTAR:
1978 case OP_TYPEUPTO:
1979 case OP_UPTO:
1980 case OP_UPTOI:
1981 return -1;
1982
1983 /* Catch unrecognized opcodes so that when new ones are added they
1984 are not forgotten, as has happened in the past. */
1985
1986 default:
1987 return -4;
1988 }
1989 }
1990 /* Control never gets here */
1991 }
1992
1993
1994
1995
1996 /*************************************************
1997 * Scan compiled regex for specific bracket *
1998 *************************************************/
1999
2000 /* This little function scans through a compiled pattern until it finds a
2001 capturing bracket with the given number, or, if the number is negative, an
2002 instance of OP_REVERSE for a lookbehind. The function is global in the C sense
2003 so that it can be called from pcre_study() when finding the minimum matching
2004 length.
2005
2006 Arguments:
2007 code points to start of expression
2008 utf TRUE in UTF-8 / UTF-16 mode
2009 number the required bracket number or negative to find a lookbehind
2010
2011 Returns: pointer to the opcode for the bracket, or NULL if not found
2012 */
2013
2014 const pcre_uchar *
2015 PRIV(find_bracket)(const pcre_uchar *code, BOOL utf, int number)
2016 {
2017 for (;;)
2018 {
2019 register int c = *code;
2020
2021 if (c == OP_END) return NULL;
2022
2023 /* XCLASS is used for classes that cannot be represented just by a bit
2024 map. This includes negated single high-valued characters. The length in
2025 the table is zero; the actual length is stored in the compiled code. */
2026
2027 if (c == OP_XCLASS) code += GET(code, 1);
2028
2029 /* Handle recursion */
2030
2031 else if (c == OP_REVERSE)
2032 {
2033 if (number < 0) return (pcre_uchar *)code;
2034 code += PRIV(OP_lengths)[c];
2035 }
2036
2037 /* Handle capturing bracket */
2038
2039 else if (c == OP_CBRA || c == OP_SCBRA ||
2040 c == OP_CBRAPOS || c == OP_SCBRAPOS)
2041 {
2042 int n = GET2(code, 1+LINK_SIZE);
2043 if (n == number) return (pcre_uchar *)code;
2044 code += PRIV(OP_lengths)[c];
2045 }
2046
2047 /* Otherwise, we can get the item's length from the table, except that for
2048 repeated character types, we have to test for \p and \P, which have an extra
2049 two bytes of parameters, and for MARK/PRUNE/SKIP/THEN with an argument, we
2050 must add in its length. */
2051
2052 else
2053 {
2054 switch(c)
2055 {
2056 case OP_TYPESTAR:
2057 case OP_TYPEMINSTAR:
2058 case OP_TYPEPLUS:
2059 case OP_TYPEMINPLUS:
2060 case OP_TYPEQUERY:
2061 case OP_TYPEMINQUERY:
2062 case OP_TYPEPOSSTAR:
2063 case OP_TYPEPOSPLUS:
2064 case OP_TYPEPOSQUERY:
2065 if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2;
2066 break;
2067
2068 case OP_TYPEUPTO:
2069 case OP_TYPEMINUPTO:
2070 case OP_TYPEEXACT:
2071 case OP_TYPEPOSUPTO:
2072 if (code[1 + IMM2_SIZE] == OP_PROP
2073 || code[1 + IMM2_SIZE] == OP_NOTPROP) code += 2;
2074 break;
2075
2076 case OP_MARK:
2077 case OP_PRUNE_ARG:
2078 case OP_SKIP_ARG:
2079 code += code[1];
2080 break;
2081
2082 case OP_THEN_ARG:
2083 code += code[1];
2084 break;
2085 }
2086
2087 /* Add in the fixed length from the table */
2088
2089 code += PRIV(OP_lengths)[c];
2090
2091 /* In UTF-8 mode, opcodes that are followed by a character may be followed by
2092 a multi-byte character. The length in the table is a minimum, so we have to
2093 arrange to skip the extra bytes. */
2094
2095 #ifdef SUPPORT_UTF
2096 if (utf) switch(c)
2097 {
2098 case OP_CHAR:
2099 case OP_CHARI:
2100 case OP_EXACT:
2101 case OP_EXACTI:
2102 case OP_UPTO:
2103 case OP_UPTOI:
2104 case OP_MINUPTO:
2105 case OP_MINUPTOI:
2106 case OP_POSUPTO:
2107 case OP_POSUPTOI:
2108 case OP_STAR:
2109 case OP_STARI:
2110 case OP_MINSTAR:
2111 case OP_MINSTARI:
2112 case OP_POSSTAR:
2113 case OP_POSSTARI:
2114 case OP_PLUS:
2115 case OP_PLUSI:
2116 case OP_MINPLUS:
2117 case OP_MINPLUSI:
2118 case OP_POSPLUS:
2119 case OP_POSPLUSI:
2120 case OP_QUERY:
2121 case OP_QUERYI:
2122 case OP_MINQUERY:
2123 case OP_MINQUERYI:
2124 case OP_POSQUERY:
2125 case OP_POSQUERYI:
2126 if (HAS_EXTRALEN(code[-1])) code += GET_EXTRALEN(code[-1]);
2127 break;
2128 }
2129 #else
2130 (void)(utf); /* Keep compiler happy by referencing function argument */
2131 #endif
2132 }
2133 }
2134 }
2135
2136
2137
2138 /*************************************************
2139 * Scan compiled regex for recursion reference *
2140 *************************************************/
2141
2142 /* This little function scans through a compiled pattern until it finds an
2143 instance of OP_RECURSE.
2144
2145 Arguments:
2146 code points to start of expression
2147 utf TRUE in UTF-8 / UTF-16 mode
2148
2149 Returns: pointer to the opcode for OP_RECURSE, or NULL if not found
2150 */
2151
2152 static const pcre_uchar *
2153 find_recurse(const pcre_uchar *code, BOOL utf)
2154 {
2155 for (;;)
2156 {
2157 register int c = *code;
2158 if (c == OP_END) return NULL;
2159 if (c == OP_RECURSE) return code;
2160
2161 /* XCLASS is used for classes that cannot be represented just by a bit
2162 map. This includes negated single high-valued characters. The length in
2163 the table is zero; the actual length is stored in the compiled code. */
2164
2165 if (c == OP_XCLASS) code += GET(code, 1);
2166
2167 /* Otherwise, we can get the item's length from the table, except that for
2168 repeated character types, we have to test for \p and \P, which have an extra
2169 two bytes of parameters, and for MARK/PRUNE/SKIP/THEN with an argument, we
2170 must add in its length. */
2171
2172 else
2173 {
2174 switch(c)
2175 {
2176 case OP_TYPESTAR:
2177 case OP_TYPEMINSTAR:
2178 case OP_TYPEPLUS:
2179 case OP_TYPEMINPLUS:
2180 case OP_TYPEQUERY:
2181 case OP_TYPEMINQUERY:
2182 case OP_TYPEPOSSTAR:
2183 case OP_TYPEPOSPLUS:
2184 case OP_TYPEPOSQUERY:
2185 if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2;
2186 break;
2187
2188 case OP_TYPEPOSUPTO:
2189 case OP_TYPEUPTO:
2190 case OP_TYPEMINUPTO:
2191 case OP_TYPEEXACT:
2192 if (code[1 + IMM2_SIZE] == OP_PROP
2193 || code[1 + IMM2_SIZE] == OP_NOTPROP) code += 2;
2194 break;
2195
2196 case OP_MARK:
2197 case OP_PRUNE_ARG:
2198 case OP_SKIP_ARG:
2199 code += code[1];
2200 break;
2201
2202 case OP_THEN_ARG:
2203 code += code[1];
2204 break;
2205 }
2206
2207 /* Add in the fixed length from the table */
2208
2209 code += PRIV(OP_lengths)[c];
2210
2211 /* In UTF-8 mode, opcodes that are followed by a character may be followed
2212 by a multi-byte character. The length in the table is a minimum, so we have
2213 to arrange to skip the extra bytes. */
2214
2215 #ifdef SUPPORT_UTF
2216 if (utf) switch(c)
2217 {
2218 case OP_CHAR:
2219 case OP_CHARI:
2220 case OP_EXACT:
2221 case OP_EXACTI:
2222 case OP_UPTO:
2223 case OP_UPTOI:
2224 case OP_MINUPTO:
2225 case OP_MINUPTOI:
2226 case OP_POSUPTO:
2227 case OP_POSUPTOI:
2228 case OP_STAR:
2229 case OP_STARI:
2230 case OP_MINSTAR:
2231 case OP_MINSTARI:
2232 case OP_POSSTAR:
2233 case OP_POSSTARI:
2234 case OP_PLUS:
2235 case OP_PLUSI:
2236 case OP_MINPLUS:
2237 case OP_MINPLUSI:
2238 case OP_POSPLUS:
2239 case OP_POSPLUSI:
2240 case OP_QUERY:
2241 case OP_QUERYI:
2242 case OP_MINQUERY:
2243 case OP_MINQUERYI:
2244 case OP_POSQUERY:
2245 case OP_POSQUERYI:
2246 if (HAS_EXTRALEN(code[-1])) code += GET_EXTRALEN(code[-1]);
2247 break;
2248 }
2249 #else
2250 (void)(utf); /* Keep compiler happy by referencing function argument */
2251 #endif
2252 }
2253 }
2254 }
2255
2256
2257
2258 /*************************************************
2259 * Scan compiled branch for non-emptiness *
2260 *************************************************/
2261
2262 /* This function scans through a branch of a compiled pattern to see whether it
2263 can match the empty string or not. It is called from could_be_empty()
2264 below and from compile_branch() when checking for an unlimited repeat of a
2265 group that can match nothing. Note that first_significant_code() skips over
2266 backward and negative forward assertions when its final argument is TRUE. If we
2267 hit an unclosed bracket, we return "empty" - this means we've struck an inner
2268 bracket whose current branch will already have been scanned.
2269
2270 Arguments:
2271 code points to start of search
2272 endcode points to where to stop
2273 utf TRUE if in UTF-8 / UTF-16 mode
2274 cd contains pointers to tables etc.
2275
2276 Returns: TRUE if what is matched could be empty
2277 */
2278
2279 static BOOL
2280 could_be_empty_branch(const pcre_uchar *code, const pcre_uchar *endcode,
2281 BOOL utf, compile_data *cd)
2282 {
2283 register int c;
2284 for (code = first_significant_code(code + PRIV(OP_lengths)[*code], TRUE);
2285 code < endcode;
2286 code = first_significant_code(code + PRIV(OP_lengths)[c], TRUE))
2287 {
2288 const pcre_uchar *ccode;
2289
2290 c = *code;
2291
2292 /* Skip over forward assertions; the other assertions are skipped by
2293 first_significant_code() with a TRUE final argument. */
2294
2295 if (c == OP_ASSERT)
2296 {
2297 do code += GET(code, 1); while (*code == OP_ALT);
2298 c = *code;
2299 continue;
2300 }
2301
2302 /* For a recursion/subroutine call, if its end has been reached, which
2303 implies a backward reference subroutine call, we can scan it. If it's a
2304 forward reference subroutine call, we can't. To detect forward reference
2305 we have to scan up the list that is kept in the workspace. This function is
2306 called only when doing the real compile, not during the pre-compile that
2307 measures the size of the compiled pattern. */
2308
2309 if (c == OP_RECURSE)
2310 {
2311 const pcre_uchar *scode;
2312 BOOL empty_branch;
2313
2314 /* Test for forward reference */
2315
2316 for (scode = cd->start_workspace; scode < cd->hwm; scode += LINK_SIZE)
2317 if (GET(scode, 0) == code + 1 - cd->start_code) return TRUE;
2318
2319 /* Not a forward reference, test for completed backward reference */
2320
2321 empty_branch = FALSE;
2322 scode = cd->start_code + GET(code, 1);
2323 if (GET(scode, 1) == 0) return TRUE; /* Unclosed */
2324
2325 /* Completed backwards reference */
2326
2327 do
2328 {
2329 if (could_be_empty_branch(scode, endcode, utf, cd))
2330 {
2331 empty_branch = TRUE;
2332 break;
2333 }
2334 scode += GET(scode, 1);
2335 }
2336 while (*scode == OP_ALT);
2337
2338 if (!empty_branch) return FALSE; /* All branches are non-empty */
2339 continue;
2340 }
2341
2342 /* Groups with zero repeats can of course be empty; skip them. */
2343
2344 if (c == OP_BRAZERO || c == OP_BRAMINZERO || c == OP_SKIPZERO ||
2345 c == OP_BRAPOSZERO)
2346 {
2347 code += PRIV(OP_lengths)[c];
2348 do code += GET(code, 1); while (*code == OP_ALT);
2349 c = *code;
2350 continue;
2351 }
2352
2353 /* A nested group that is already marked as "could be empty" can just be
2354 skipped. */
2355
2356 if (c == OP_SBRA || c == OP_SBRAPOS ||
2357 c == OP_SCBRA || c == OP_SCBRAPOS)
2358 {
2359 do code += GET(code, 1); while (*code == OP_ALT);
2360 c = *code;
2361 continue;
2362 }
2363
2364 /* For other groups, scan the branches. */
2365
2366 if (c == OP_BRA || c == OP_BRAPOS ||
2367 c == OP_CBRA || c == OP_CBRAPOS ||
2368 c == OP_ONCE || c == OP_ONCE_NC ||
2369 c == OP_COND)
2370 {
2371 BOOL empty_branch;
2372 if (GET(code, 1) == 0) return TRUE; /* Hit unclosed bracket */
2373
2374 /* If a conditional group has only one branch, there is a second, implied,
2375 empty branch, so just skip over the conditional, because it could be empty.
2376 Otherwise, scan the individual branches of the group. */
2377
2378 if (c == OP_COND && code[GET(code, 1)] != OP_ALT)
2379 code += GET(code, 1);
2380 else
2381 {
2382 empty_branch = FALSE;
2383 do
2384 {
2385 if (!empty_branch && could_be_empty_branch(code, endcode, utf, cd))
2386 empty_branch = TRUE;
2387 code += GET(code, 1);
2388 }
2389 while (*code == OP_ALT);
2390 if (!empty_branch) return FALSE; /* All branches are non-empty */
2391 }
2392
2393 c = *code;
2394 continue;
2395 }
2396
2397 /* Handle the other opcodes */
2398
2399 switch (c)
2400 {
2401 /* Check for quantifiers after a class. XCLASS is used for classes that
2402 cannot be represented just by a bit map. This includes negated single
2403 high-valued characters. The length in PRIV(OP_lengths)[] is zero; the
2404 actual length is stored in the compiled code, so we must update "code"
2405 here. */
2406
2407 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
2408 case OP_XCLASS:
2409 ccode = code += GET(code, 1);
2410 goto CHECK_CLASS_REPEAT;
2411 #endif
2412
2413 case OP_CLASS:
2414 case OP_NCLASS:
2415 ccode = code + PRIV(OP_lengths)[OP_CLASS];
2416
2417 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
2418 CHECK_CLASS_REPEAT:
2419 #endif
2420
2421 switch (*ccode)
2422 {
2423 case OP_CRSTAR: /* These could be empty; continue */
2424 case OP_CRMINSTAR:
2425 case OP_CRQUERY:
2426 case OP_CRMINQUERY:
2427 break;
2428
2429 default: /* Non-repeat => class must match */
2430 case OP_CRPLUS: /* These repeats aren't empty */
2431 case OP_CRMINPLUS:
2432 return FALSE;
2433
2434 case OP_CRRANGE:
2435 case OP_CRMINRANGE:
2436 if (GET2(ccode, 1) > 0) return FALSE; /* Minimum > 0 */
2437 break;
2438 }
2439 break;
2440
2441 /* Opcodes that must match a character */
2442
2443 case OP_PROP:
2444 case OP_NOTPROP:
2445 case OP_EXTUNI:
2446 case OP_NOT_DIGIT:
2447 case OP_DIGIT:
2448 case OP_NOT_WHITESPACE:
2449 case OP_WHITESPACE:
2450 case OP_NOT_WORDCHAR:
2451 case OP_WORDCHAR:
2452 case OP_ANY:
2453 case OP_ALLANY:
2454 case OP_ANYBYTE:
2455 case OP_CHAR:
2456 case OP_CHARI:
2457 case OP_NOT:
2458 case OP_NOTI:
2459 case OP_PLUS:
2460 case OP_MINPLUS:
2461 case OP_POSPLUS:
2462 case OP_EXACT:
2463 case OP_NOTPLUS:
2464 case OP_NOTMINPLUS:
2465 case OP_NOTPOSPLUS:
2466 case OP_NOTEXACT:
2467 case OP_TYPEPLUS:
2468 case OP_TYPEMINPLUS:
2469 case OP_TYPEPOSPLUS:
2470 case OP_TYPEEXACT:
2471 return FALSE;
2472
2473 /* These are going to continue, as they may be empty, but we have to
2474 fudge the length for the \p and \P cases. */
2475
2476 case OP_TYPESTAR:
2477 case OP_TYPEMINSTAR:
2478 case OP_TYPEPOSSTAR:
2479 case OP_TYPEQUERY:
2480 case OP_TYPEMINQUERY:
2481 case OP_TYPEPOSQUERY:
2482 if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2;
2483 break;
2484
2485 /* Same for these */
2486
2487 case OP_TYPEUPTO:
2488 case OP_TYPEMINUPTO:
2489 case OP_TYPEPOSUPTO:
2490 if (code[1 + IMM2_SIZE] == OP_PROP
2491 || code[1 + IMM2_SIZE] == OP_NOTPROP) code += 2;
2492 break;
2493
2494 /* End of branch */
2495
2496 case OP_KET:
2497 case OP_KETRMAX:
2498 case OP_KETRMIN:
2499 case OP_KETRPOS:
2500 case OP_ALT:
2501 return TRUE;
2502
2503 /* In UTF-8 mode, STAR, MINSTAR, POSSTAR, QUERY, MINQUERY, POSQUERY, UPTO,
2504 MINUPTO, and POSUPTO may be followed by a multibyte character */
2505
2506 #ifdef SUPPORT_UTF
2507 case OP_STAR:
2508 case OP_STARI:
2509 case OP_MINSTAR:
2510 case OP_MINSTARI:
2511 case OP_POSSTAR:
2512 case OP_POSSTARI:
2513 case OP_QUERY:
2514 case OP_QUERYI:
2515 case OP_MINQUERY:
2516 case OP_MINQUERYI:
2517 case OP_POSQUERY:
2518 case OP_POSQUERYI:
2519 if (utf && HAS_EXTRALEN(code[1])) code += GET_EXTRALEN(code[1]);
2520 break;
2521
2522 case OP_UPTO:
2523 case OP_UPTOI:
2524 case OP_MINUPTO:
2525 case OP_MINUPTOI:
2526 case OP_POSUPTO:
2527 case OP_POSUPTOI:
2528 if (utf && HAS_EXTRALEN(code[1 + IMM2_SIZE])) code += GET_EXTRALEN(code[1 + IMM2_SIZE]);
2529 break;
2530 #endif
2531
2532 /* MARK, and PRUNE/SKIP/THEN with an argument must skip over the argument
2533 string. */
2534
2535 case OP_MARK:
2536 case OP_PRUNE_ARG:
2537 case OP_SKIP_ARG:
2538 code += code[1];
2539 break;
2540
2541 case OP_THEN_ARG:
2542 code += code[1];
2543 break;
2544
2545 /* None of the remaining opcodes are required to match a character. */
2546
2547 default:
2548 break;
2549 }
2550 }
2551
2552 return TRUE;
2553 }
2554
2555
2556
2557 /*************************************************
2558 * Scan compiled regex for non-emptiness *
2559 *************************************************/
2560
2561 /* This function is called to check for left recursive calls. We want to check
2562 the current branch of the current pattern to see if it could match the empty
2563 string. If it could, we must look outwards for branches at other levels,
2564 stopping when we pass beyond the bracket which is the subject of the recursion.
2565 This function is called only during the real compile, not during the
2566 pre-compile.
2567
2568 Arguments:
2569 code points to start of the recursion
2570 endcode points to where to stop (current RECURSE item)
2571 bcptr points to the chain of current (unclosed) branch starts
2572 utf TRUE if in UTF-8 / UTF-16 mode
2573 cd pointers to tables etc
2574
2575 Returns: TRUE if what is matched could be empty
2576 */
2577
2578 static BOOL
2579 could_be_empty(const pcre_uchar *code, const pcre_uchar *endcode,
2580 branch_chain *bcptr, BOOL utf, compile_data *cd)
2581 {
2582 while (bcptr != NULL && bcptr->current_branch >= code)
2583 {
2584 if (!could_be_empty_branch(bcptr->current_branch, endcode, utf, cd))
2585 return FALSE;
2586 bcptr = bcptr->outer;
2587 }
2588 return TRUE;
2589 }
2590
2591
2592
2593 /*************************************************
2594 * Check for POSIX class syntax *
2595 *************************************************/
2596
2597 /* This function is called when the sequence "[:" or "[." or "[=" is
2598 encountered in a character class. It checks whether this is followed by a
2599 sequence of characters terminated by a matching ":]" or ".]" or "=]". If we
2600 reach an unescaped ']' without the special preceding character, return FALSE.
2601
2602 Originally, this function only recognized a sequence of letters between the
2603 terminators, but it seems that Perl recognizes any sequence of characters,
2604 though of course unknown POSIX names are subsequently rejected. Perl gives an
2605 "Unknown POSIX class" error for [:f\oo:] for example, where previously PCRE
2606 didn't consider this to be a POSIX class. Likewise for [:1234:].
2607
2608 The problem in trying to be exactly like Perl is in the handling of escapes. We
2609 have to be sure that [abc[:x\]pqr] is *not* treated as containing a POSIX
2610 class, but [abc[:x\]pqr:]] is (so that an error can be generated). The code
2611 below handles the special case of \], but does not try to do any other escape
2612 processing. This makes it different from Perl for cases such as [:l\ower:]
2613 where Perl recognizes it as the POSIX class "lower" but PCRE does not recognize
2614 "l\ower". This is a lesser evil that not diagnosing bad classes when Perl does,
2615 I think.
2616
2617 A user pointed out that PCRE was rejecting [:a[:digit:]] whereas Perl was not.
2618 It seems that the appearance of a nested POSIX class supersedes an apparent
2619 external class. For example, [:a[:digit:]b:] matches "a", "b", ":", or
2620 a digit.
2621
2622 In Perl, unescaped square brackets may also appear as part of class names. For
2623 example, [:a[:abc]b:] gives unknown POSIX class "[:abc]b:]". However, for
2624 [:a[:abc]b][b:] it gives unknown POSIX class "[:abc]b][b:]", which does not
2625 seem right at all. PCRE does not allow closing square brackets in POSIX class
2626 names.
2627
2628 Arguments:
2629 ptr pointer to the initial [
2630 endptr where to return the end pointer
2631
2632 Returns: TRUE or FALSE
2633 */
2634
2635 static BOOL
2636 check_posix_syntax(const pcre_uchar *ptr, const pcre_uchar **endptr)
2637 {
2638 int terminator; /* Don't combine these lines; the Solaris cc */
2639 terminator = *(++ptr); /* compiler warns about "non-constant" initializer. */
2640 for (++ptr; *ptr != 0; ptr++)
2641 {
2642 if (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
2643 ptr++;
2644 else if (*ptr == CHAR_RIGHT_SQUARE_BRACKET) return FALSE;
2645 else
2646 {
2647 if (*ptr == terminator && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
2648 {
2649 *endptr = ptr;
2650 return TRUE;
2651 }
2652 if (*ptr == CHAR_LEFT_SQUARE_BRACKET &&
2653 (ptr[1] == CHAR_COLON || ptr[1] == CHAR_DOT ||
2654 ptr[1] == CHAR_EQUALS_SIGN) &&
2655 check_posix_syntax(ptr, endptr))
2656 return FALSE;
2657 }
2658 }
2659 return FALSE;
2660 }
2661
2662
2663
2664
2665 /*************************************************
2666 * Check POSIX class name *
2667 *************************************************/
2668
2669 /* This function is called to check the name given in a POSIX-style class entry
2670 such as [:alnum:].
2671
2672 Arguments:
2673 ptr points to the first letter
2674 len the length of the name
2675
2676 Returns: a value representing the name, or -1 if unknown
2677 */
2678
2679 static int
2680 check_posix_name(const pcre_uchar *ptr, int len)
2681 {
2682 const char *pn = posix_names;
2683 register int yield = 0;
2684 while (posix_name_lengths[yield] != 0)
2685 {
2686 if (len == posix_name_lengths[yield] &&
2687 STRNCMP_UC_C8(ptr, pn, len) == 0) return yield;
2688 pn += posix_name_lengths[yield] + 1;
2689 yield++;
2690 }
2691 return -1;
2692 }
2693
2694
2695 /*************************************************
2696 * Adjust OP_RECURSE items in repeated group *
2697 *************************************************/
2698
2699 /* OP_RECURSE items contain an offset from the start of the regex to the group
2700 that is referenced. This means that groups can be replicated for fixed
2701 repetition simply by copying (because the recursion is allowed to refer to
2702 earlier groups that are outside the current group). However, when a group is
2703 optional (i.e. the minimum quantifier is zero), OP_BRAZERO or OP_SKIPZERO is
2704 inserted before it, after it has been compiled. This means that any OP_RECURSE
2705 items within it that refer to the group itself or any contained groups have to
2706 have their offsets adjusted. That one of the jobs of this function. Before it
2707 is called, the partially compiled regex must be temporarily terminated with
2708 OP_END.
2709
2710 This function has been extended with the possibility of forward references for
2711 recursions and subroutine calls. It must also check the list of such references
2712 for the group we are dealing with. If it finds that one of the recursions in
2713 the current group is on this list, it adjusts the offset in the list, not the
2714 value in the reference (which is a group number).
2715
2716 Arguments:
2717 group points to the start of the group
2718 adjust the amount by which the group is to be moved
2719 utf TRUE in UTF-8 / UTF-16 mode
2720 cd contains pointers to tables etc.
2721 save_hwm the hwm forward reference pointer at the start of the group
2722
2723 Returns: nothing
2724 */
2725
2726 static void
2727 adjust_recurse(pcre_uchar *group, int adjust, BOOL utf, compile_data *cd,
2728 pcre_uchar *save_hwm)
2729 {
2730 pcre_uchar *ptr = group;
2731
2732 while ((ptr = (pcre_uchar *)find_recurse(ptr, utf)) != NULL)
2733 {
2734 int offset;
2735 pcre_uchar *hc;
2736
2737 /* See if this recursion is on the forward reference list. If so, adjust the
2738 reference. */
2739
2740 for (hc = save_hwm; hc < cd->hwm; hc += LINK_SIZE)
2741 {
2742 offset = GET(hc, 0);
2743 if (cd->start_code + offset == ptr + 1)
2744 {
2745 PUT(hc, 0, offset + adjust);
2746 break;
2747 }
2748 }
2749
2750 /* Otherwise, adjust the recursion offset if it's after the start of this
2751 group. */
2752
2753 if (hc >= cd->hwm)
2754 {
2755 offset = GET(ptr, 1);
2756 if (cd->start_code + offset >= group) PUT(ptr, 1, offset + adjust);
2757 }
2758
2759 ptr += 1 + LINK_SIZE;
2760 }
2761 }
2762
2763
2764
2765 /*************************************************
2766 * Insert an automatic callout point *
2767 *************************************************/
2768
2769 /* This function is called when the PCRE_AUTO_CALLOUT option is set, to insert
2770 callout points before each pattern item.
2771
2772 Arguments:
2773 code current code pointer
2774 ptr current pattern pointer
2775 cd pointers to tables etc
2776
2777 Returns: new code pointer
2778 */
2779
2780 static pcre_uchar *
2781 auto_callout(pcre_uchar *code, const pcre_uchar *ptr, compile_data *cd)
2782 {
2783 *code++ = OP_CALLOUT;
2784 *code++ = 255;
2785 PUT(code, 0, (int)(ptr - cd->start_pattern)); /* Pattern offset */
2786 PUT(code, LINK_SIZE, 0); /* Default length */
2787 return code + 2 * LINK_SIZE;
2788 }
2789
2790
2791
2792 /*************************************************
2793 * Complete a callout item *
2794 *************************************************/
2795
2796 /* A callout item contains the length of the next item in the pattern, which
2797 we can't fill in till after we have reached the relevant point. This is used
2798 for both automatic and manual callouts.
2799
2800 Arguments:
2801 previous_callout points to previous callout item
2802 ptr current pattern pointer
2803 cd pointers to tables etc
2804
2805 Returns: nothing
2806 */
2807
2808 static void
2809 complete_callout(pcre_uchar *previous_callout, const pcre_uchar *ptr, compile_data *cd)
2810 {
2811 int length = (int)(ptr - cd->start_pattern - GET(previous_callout, 2));
2812 PUT(previous_callout, 2 + LINK_SIZE, length);
2813 }
2814
2815
2816
2817 #ifdef SUPPORT_UCP
2818 /*************************************************
2819 * Get othercase range *
2820 *************************************************/
2821
2822 /* This function is passed the start and end of a class range, in UTF-8 mode
2823 with UCP support. It searches up the characters, looking for internal ranges of
2824 characters in the "other" case. Each call returns the next one, updating the
2825 start address.
2826
2827 Arguments:
2828 cptr points to starting character value; updated
2829 d end value
2830 ocptr where to put start of othercase range
2831 odptr where to put end of othercase range
2832
2833 Yield: TRUE when range returned; FALSE when no more
2834 */
2835
2836 static BOOL
2837 get_othercase_range(unsigned int *cptr, unsigned int d, unsigned int *ocptr,
2838 unsigned int *odptr)
2839 {
2840 unsigned int c, othercase, next;
2841
2842 for (c = *cptr; c <= d; c++)
2843 { if ((othercase = UCD_OTHERCASE(c)) != c) break; }
2844
2845 if (c > d) return FALSE;
2846
2847 *ocptr = othercase;
2848 next = othercase + 1;
2849
2850 for (++c; c <= d; c++)
2851 {
2852 if (UCD_OTHERCASE(c) != next) break;
2853 next++;
2854 }
2855
2856 *odptr = next - 1;
2857 *cptr = c;
2858
2859 return TRUE;
2860 }
2861
2862
2863
2864 /*************************************************
2865 * Check a character and a property *
2866 *************************************************/
2867
2868 /* This function is called by check_auto_possessive() when a property item
2869 is adjacent to a fixed character.
2870
2871 Arguments:
2872 c the character
2873 ptype the property type
2874 pdata the data for the type
2875 negated TRUE if it's a negated property (\P or \p{^)
2876
2877 Returns: TRUE if auto-possessifying is OK
2878 */
2879
2880 static BOOL
2881 check_char_prop(int c, int ptype, int pdata, BOOL negated)
2882 {
2883 const ucd_record *prop = GET_UCD(c);
2884 switch(ptype)
2885 {
2886 case PT_LAMP:
2887 return (prop->chartype == ucp_Lu ||
2888 prop->chartype == ucp_Ll ||
2889 prop->chartype == ucp_Lt) == negated;
2890
2891 case PT_GC:
2892 return (pdata == PRIV(ucp_gentype)[prop->chartype]) == negated;
2893
2894 case PT_PC:
2895 return (pdata == prop->chartype) == negated;
2896
2897 case PT_SC:
2898 return (pdata == prop->script) == negated;
2899
2900 /* These are specials */
2901
2902 case PT_ALNUM:
2903 return (PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
2904 PRIV(ucp_gentype)[prop->chartype] == ucp_N) == negated;
2905
2906 case PT_SPACE: /* Perl space */
2907 return (PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
2908 c == CHAR_HT || c == CHAR_NL || c == CHAR_FF || c == CHAR_CR)
2909 == negated;
2910
2911 case PT_PXSPACE: /* POSIX space */
2912 return (PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
2913 c == CHAR_HT || c == CHAR_NL || c == CHAR_VT ||
2914 c == CHAR_FF || c == CHAR_CR)
2915 == negated;
2916
2917 case PT_WORD:
2918 return (PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
2919 PRIV(ucp_gentype)[prop->chartype] == ucp_N ||
2920 c == CHAR_UNDERSCORE) == negated;
2921 }
2922 return FALSE;
2923 }
2924 #endif /* SUPPORT_UCP */
2925
2926
2927
2928 /*************************************************
2929 * Check if auto-possessifying is possible *
2930 *************************************************/
2931
2932 /* This function is called for unlimited repeats of certain items, to see
2933 whether the next thing could possibly match the repeated item. If not, it makes
2934 sense to automatically possessify the repeated item.
2935
2936 Arguments:
2937 previous pointer to the repeated opcode
2938 utf TRUE in UTF-8 / UTF-16 mode
2939 ptr next character in pattern
2940 options options bits
2941 cd contains pointers to tables etc.
2942
2943 Returns: TRUE if possessifying is wanted
2944 */
2945
2946 static BOOL
2947 check_auto_possessive(const pcre_uchar *previous, BOOL utf,
2948 const pcre_uchar *ptr, int options, compile_data *cd)
2949 {
2950 pcre_int32 c, next;
2951 int op_code = *previous++;
2952
2953 /* Skip whitespace and comments in extended mode */
2954
2955 if ((options & PCRE_EXTENDED) != 0)
2956 {
2957 for (;;)
2958 {
2959 while (MAX_255(*ptr) && (cd->ctypes[*ptr] & ctype_space) != 0) ptr++;
2960 if (*ptr == CHAR_NUMBER_SIGN)
2961 {
2962 ptr++;
2963 while (*ptr != 0)
2964 {
2965 if (IS_NEWLINE(ptr)) { ptr += cd->nllen; break; }
2966 ptr++;
2967 #ifdef SUPPORT_UTF
2968 if (utf) FORWARDCHAR(ptr);
2969 #endif
2970 }
2971 }
2972 else break;
2973 }
2974 }
2975
2976 /* If the next item is one that we can handle, get its value. A non-negative
2977 value is a character, a negative value is an escape value. */
2978
2979 if (*ptr == CHAR_BACKSLASH)
2980 {
2981 int temperrorcode = 0;
2982 next = check_escape(&ptr, &temperrorcode, cd->bracount, options, FALSE);
2983 if (temperrorcode != 0) return FALSE;
2984 ptr++; /* Point after the escape sequence */
2985 }
2986 else if (!MAX_255(*ptr) || (cd->ctypes[*ptr] & ctype_meta) == 0)
2987 {
2988 #ifdef SUPPORT_UTF
2989 if (utf) { GETCHARINC(next, ptr); } else
2990 #endif
2991 next = *ptr++;
2992 }
2993 else return FALSE;
2994
2995 /* Skip whitespace and comments in extended mode */
2996
2997 if ((options & PCRE_EXTENDED) != 0)
2998 {
2999 for (;;)
3000 {
3001 while (MAX_255(*ptr) && (cd->ctypes[*ptr] & ctype_space) != 0) ptr++;
3002 if (*ptr == CHAR_NUMBER_SIGN)
3003 {
3004 ptr++;
3005 while (*ptr != 0)
3006 {
3007 if (IS_NEWLINE(ptr)) { ptr += cd->nllen; break; }
3008 ptr++;
3009 #ifdef SUPPORT_UTF
3010 if (utf) FORWARDCHAR(ptr);
3011 #endif
3012 }
3013 }
3014 else break;
3015 }
3016 }
3017
3018 /* If the next thing is itself optional, we have to give up. */
3019
3020 if (*ptr == CHAR_ASTERISK || *ptr == CHAR_QUESTION_MARK ||
3021 STRNCMP_UC_C8(ptr, STR_LEFT_CURLY_BRACKET STR_0 STR_COMMA, 3) == 0)
3022 return FALSE;
3023
3024 /* Now compare the next item with the previous opcode. First, handle cases when
3025 the next item is a character. */
3026
3027 if (next >= 0) switch(op_code)
3028 {
3029 case OP_CHAR:
3030 #ifdef SUPPORT_UTF
3031 GETCHARTEST(c, previous);
3032 #else
3033 c = *previous;
3034 #endif
3035 return c != next;
3036
3037 /* For CHARI (caseless character) we must check the other case. If we have
3038 Unicode property support, we can use it to test the other case of
3039 high-valued characters. */
3040
3041 case OP_CHARI:
3042 #ifdef SUPPORT_UTF
3043 GETCHARTEST(c, previous);
3044 #else
3045 c = *previous;
3046 #endif
3047 if (c == next) return FALSE;
3048 #ifdef SUPPORT_UTF
3049 if (utf)
3050 {
3051 unsigned int othercase;
3052 if (next < 128) othercase = cd->fcc[next]; else
3053 #ifdef SUPPORT_UCP
3054 othercase = UCD_OTHERCASE((unsigned int)next);
3055 #else
3056 othercase = NOTACHAR;
3057 #endif
3058 return (unsigned int)c != othercase;
3059 }
3060 else
3061 #endif /* SUPPORT_UTF */
3062 return (c != cd->fcc[next]); /* Non-UTF-8 mode */
3063
3064 /* For OP_NOT and OP_NOTI, the data is always a single-byte character. These
3065 opcodes are not used for multi-byte characters, because they are coded using
3066 an XCLASS instead. */
3067
3068 case OP_NOT:
3069 return (c = *previous) == next;
3070
3071 case OP_NOTI:
3072 if ((c = *previous) == next) return TRUE;
3073 #ifdef SUPPORT_UTF
3074 if (utf)
3075 {
3076 unsigned int othercase;
3077 if (next < 128) othercase = cd->fcc[next]; else
3078 #ifdef SUPPORT_UCP
3079 othercase = UCD_OTHERCASE(next);
3080 #else
3081 othercase = NOTACHAR;
3082 #endif
3083 return (unsigned int)c == othercase;
3084 }
3085 else
3086 #endif /* SUPPORT_UTF */
3087 return (c == cd->fcc[next]); /* Non-UTF-8 mode */
3088
3089 /* Note that OP_DIGIT etc. are generated only when PCRE_UCP is *not* set.
3090 When it is set, \d etc. are converted into OP_(NOT_)PROP codes. */
3091
3092 case OP_DIGIT:
3093 return next > 127 || (cd->ctypes[next] & ctype_digit) == 0;
3094
3095 case OP_NOT_DIGIT:
3096 return next <= 127 && (cd->ctypes[next] & ctype_digit) != 0;
3097
3098 case OP_WHITESPACE:
3099 return next > 127 || (cd->ctypes[next] & ctype_space) == 0;
3100
3101 case OP_NOT_WHITESPACE:
3102 return next <= 127 && (cd->ctypes[next] & ctype_space) != 0;
3103
3104 case OP_WORDCHAR:
3105 return next > 127 || (cd->ctypes[next] & ctype_word) == 0;
3106
3107 case OP_NOT_WORDCHAR:
3108 return next <= 127 && (cd->ctypes[next] & ctype_word) != 0;
3109
3110 case OP_HSPACE:
3111 case OP_NOT_HSPACE:
3112 switch(next)
3113 {
3114 case 0x09:
3115 case 0x20:
3116 case 0xa0:
3117 case 0x1680:
3118 case 0x180e:
3119 case 0x2000:
3120 case 0x2001:
3121 case 0x2002:
3122 case 0x2003:
3123 case 0x2004:
3124 case 0x2005:
3125 case 0x2006:
3126 case 0x2007:
3127 case 0x2008:
3128 case 0x2009:
3129 case 0x200A:
3130 case 0x202f:
3131 case 0x205f:
3132 case 0x3000:
3133 return op_code == OP_NOT_HSPACE;
3134 default:
3135 return op_code != OP_NOT_HSPACE;
3136 }
3137
3138 case OP_ANYNL:
3139 case OP_VSPACE:
3140 case OP_NOT_VSPACE:
3141 switch(next)
3142 {
3143 case 0x0a:
3144 case 0x0b:
3145 case 0x0c:
3146 case 0x0d:
3147 case 0x85:
3148 case 0x2028:
3149 case 0x2029:
3150 return op_code == OP_NOT_VSPACE;
3151 default:
3152 return op_code != OP_NOT_VSPACE;
3153 }
3154
3155 #ifdef SUPPORT_UCP
3156 case OP_PROP:
3157 return check_char_prop(next, previous[0], previous[1], FALSE);
3158
3159 case OP_NOTPROP:
3160 return check_char_prop(next, previous[0], previous[1], TRUE);
3161 #endif
3162
3163 default:
3164 return FALSE;
3165 }
3166
3167
3168 /* Handle the case when the next item is \d, \s, etc. Note that when PCRE_UCP
3169 is set, \d turns into ESC_du rather than ESC_d, etc., so ESC_d etc. are
3170 generated only when PCRE_UCP is *not* set, that is, when only ASCII
3171 characteristics are recognized. Similarly, the opcodes OP_DIGIT etc. are
3172 replaced by OP_PROP codes when PCRE_UCP is set. */
3173
3174 switch(op_code)
3175 {
3176 case OP_CHAR:
3177 case OP_CHARI:
3178 #ifdef SUPPORT_UTF
3179 GETCHARTEST(c, previous);
3180 #else
3181 c = *previous;
3182 #endif
3183 switch(-next)
3184 {
3185 case ESC_d:
3186 return c > 127 || (cd->ctypes[c] & ctype_digit) == 0;
3187
3188 case ESC_D:
3189 return c <= 127 && (cd->ctypes[c] & ctype_digit) != 0;
3190
3191 case ESC_s:
3192 return c > 127 || (cd->ctypes[c] & ctype_space) == 0;
3193
3194 case ESC_S:
3195 return c <= 127 && (cd->ctypes[c] & ctype_space) != 0;
3196
3197 case ESC_w:
3198 return c > 127 || (cd->ctypes[c] & ctype_word) == 0;
3199
3200 case ESC_W:
3201 return c <= 127 && (cd->ctypes[c] & ctype_word) != 0;
3202
3203 case ESC_h:
3204 case ESC_H:
3205 switch(c)
3206 {
3207 case 0x09:
3208 case 0x20:
3209 case 0xa0:
3210 case 0x1680:
3211 case 0x180e:
3212 case 0x2000:
3213 case 0x2001:
3214 case 0x2002:
3215 case 0x2003:
3216 case 0x2004:
3217 case 0x2005:
3218 case 0x2006:
3219 case 0x2007:
3220 case 0x2008:
3221 case 0x2009:
3222 case 0x200A:
3223 case 0x202f:
3224 case 0x205f:
3225 case 0x3000:
3226 return -next != ESC_h;
3227 default:
3228 return -next == ESC_h;
3229 }
3230
3231 case ESC_v:
3232 case ESC_V:
3233 switch(c)
3234 {
3235 case 0x0a:
3236 case 0x0b:
3237 case 0x0c:
3238 case 0x0d:
3239 case 0x85:
3240 case 0x2028:
3241 case 0x2029:
3242 return -next != ESC_v;
3243 default:
3244 return -next == ESC_v;
3245 }
3246
3247 /* When PCRE_UCP is set, these values get generated for \d etc. Find
3248 their substitutions and process them. The result will always be either
3249 -ESC_p or -ESC_P. Then fall through to process those values. */
3250
3251 #ifdef SUPPORT_UCP
3252 case ESC_du:
3253 case ESC_DU:
3254 case ESC_wu:
3255 case ESC_WU:
3256 case ESC_su:
3257 case ESC_SU:
3258 {
3259 int temperrorcode = 0;
3260 ptr = substitutes[-next - ESC_DU];
3261 next = check_escape(&ptr, &temperrorcode, 0, options, FALSE);
3262 if (temperrorcode != 0) return FALSE;
3263 ptr++; /* For compatibility */
3264 }
3265 /* Fall through */
3266
3267 case ESC_p:
3268 case ESC_P:
3269 {
3270 int ptype, pdata, errorcodeptr;
3271 BOOL negated;
3272
3273 ptr--; /* Make ptr point at the p or P */
3274 ptype = get_ucp(&ptr, &negated, &pdata, &errorcodeptr);
3275 if (ptype < 0) return FALSE;
3276 ptr++; /* Point past the final curly ket */
3277
3278 /* If the property item is optional, we have to give up. (When generated
3279 from \d etc by PCRE_UCP, this test will have been applied much earlier,
3280 to the original \d etc. At this point, ptr will point to a zero byte. */
3281
3282 if (*ptr == CHAR_ASTERISK || *ptr == CHAR_QUESTION_MARK ||
3283 STRNCMP_UC_C8(ptr, STR_LEFT_CURLY_BRACKET STR_0 STR_COMMA, 3) == 0)
3284 return FALSE;
3285
3286 /* Do the property check. */
3287
3288 return check_char_prop(c, ptype, pdata, (next == -ESC_P) != negated);
3289 }
3290 #endif
3291
3292 default:
3293 return FALSE;
3294 }
3295
3296 /* In principle, support for Unicode properties should be integrated here as
3297 well. It means re-organizing the above code so as to get hold of the property
3298 values before switching on the op-code. However, I wonder how many patterns
3299 combine ASCII \d etc with Unicode properties? (Note that if PCRE_UCP is set,
3300 these op-codes are never generated.) */
3301
3302 case OP_DIGIT:
3303 return next == -ESC_D || next == -ESC_s || next == -ESC_W ||
3304 next == -ESC_h || next == -ESC_v || next == -ESC_R;
3305
3306 case OP_NOT_DIGIT:
3307 return next == -ESC_d;
3308
3309 case OP_WHITESPACE:
3310 return next == -ESC_S || next == -ESC_d || next == -ESC_w || next == -ESC_R;
3311
3312 case OP_NOT_WHITESPACE:
3313 return next == -ESC_s || next == -ESC_h || next == -ESC_v;
3314
3315 case OP_HSPACE:
3316 return next == -ESC_S || next == -ESC_H || next == -ESC_d ||
3317 next == -ESC_w || next == -ESC_v || next == -ESC_R;
3318
3319 case OP_NOT_HSPACE:
3320 return next == -ESC_h;
3321
3322 /* Can't have \S in here because VT matches \S (Perl anomaly) */
3323 case OP_ANYNL:
3324 case OP_VSPACE:
3325 return next == -ESC_V || next == -ESC_d || next == -ESC_w;
3326
3327 case OP_NOT_VSPACE:
3328 return next == -ESC_v || next == -ESC_R;
3329
3330 case OP_WORDCHAR:
3331 return next == -ESC_W || next == -ESC_s || next == -ESC_h ||
3332 next == -ESC_v || next == -ESC_R;
3333
3334 case OP_NOT_WORDCHAR:
3335 return next == -ESC_w || next == -ESC_d;
3336
3337 default:
3338 return FALSE;
3339 }
3340
3341 /* Control does not reach here */
3342 }
3343
3344
3345
3346 /*************************************************
3347 * Compile one branch *
3348 *************************************************/
3349
3350 /* Scan the pattern, compiling it into the a vector. If the options are
3351 changed during the branch, the pointer is used to change the external options
3352 bits. This function is used during the pre-compile phase when we are trying
3353 to find out the amount of memory needed, as well as during the real compile
3354 phase. The value of lengthptr distinguishes the two phases.
3355
3356 Arguments:
3357 optionsptr pointer to the option bits
3358 codeptr points to the pointer to the current code point
3359 ptrptr points to the current pattern pointer
3360 errorcodeptr points to error code variable
3361 firstcharptr set to initial literal character, or < 0 (REQ_UNSET, REQ_NONE)
3362 reqcharptr set to the last literal character required, else < 0
3363 bcptr points to current branch chain
3364 cond_depth conditional nesting depth
3365 cd contains pointers to tables etc.
3366 lengthptr NULL during the real compile phase
3367 points to length accumulator during pre-compile phase
3368
3369 Returns: TRUE on success
3370 FALSE, with *errorcodeptr set non-zero on error
3371 */
3372
3373 static BOOL
3374 compile_branch(int *optionsptr, pcre_uchar **codeptr,
3375 const pcre_uchar **ptrptr, int *errorcodeptr, pcre_int32 *firstcharptr,
3376 pcre_int32 *reqcharptr, branch_chain *bcptr, int cond_depth,
3377 compile_data *cd, int *lengthptr)
3378 {
3379 int repeat_type, op_type;
3380 int repeat_min = 0, repeat_max = 0; /* To please picky compilers */
3381 int bravalue = 0;
3382 int greedy_default, greedy_non_default;
3383 pcre_int32 firstchar, reqchar;
3384 pcre_int32 zeroreqchar, zerofirstchar;
3385 pcre_int32 req_caseopt, reqvary, tempreqvary;
3386 int options = *optionsptr; /* May change dynamically */
3387 int after_manual_callout = 0;
3388 int length_prevgroup = 0;
3389 register int c;
3390 register pcre_uchar *code = *codeptr;
3391 pcre_uchar *last_code = code;
3392 pcre_uchar *orig_code = code;
3393 pcre_uchar *tempcode;
3394 BOOL inescq = FALSE;
3395 BOOL groupsetfirstchar = FALSE;
3396 const pcre_uchar *ptr = *ptrptr;
3397 const pcre_uchar *tempptr;
3398 const pcre_uchar *nestptr = NULL;
3399 pcre_uchar *previous = NULL;
3400 pcre_uchar *previous_callout = NULL;
3401 pcre_uchar *save_hwm = NULL;
3402 pcre_uint8 classbits[32];
3403
3404 /* We can fish out the UTF-8 setting once and for all into a BOOL, but we
3405 must not do this for other options (e.g. PCRE_EXTENDED) because they may change
3406 dynamically as we process the pattern. */
3407
3408 #ifdef SUPPORT_UTF
3409 /* PCRE_UTF16 has the same value as PCRE_UTF8. */
3410 BOOL utf = (options & PCRE_UTF8) != 0;
3411 pcre_uchar utf_chars[6];
3412 #else
3413 BOOL utf = FALSE;
3414 #endif
3415
3416 /* Helper variables for OP_XCLASS opcode (for characters > 255). */
3417
3418 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
3419 BOOL xclass;
3420 pcre_uchar *class_uchardata;
3421 pcre_uchar *class_uchardata_base;
3422 #endif
3423
3424 #ifdef PCRE_DEBUG
3425 if (lengthptr != NULL) DPRINTF((">> start branch\n"));
3426 #endif
3427
3428 /* Set up the default and non-default settings for greediness */
3429
3430 greedy_default = ((options & PCRE_UNGREEDY) != 0);
3431 greedy_non_default = greedy_default ^ 1;
3432
3433 /* Initialize no first byte, no required byte. REQ_UNSET means "no char
3434 matching encountered yet". It gets changed to REQ_NONE if we hit something that
3435 matches a non-fixed char first char; reqchar just remains unset if we never
3436 find one.
3437
3438 When we hit a repeat whose minimum is zero, we may have to adjust these values
3439 to take the zero repeat into account. This is implemented by setting them to
3440 zerofirstbyte and zeroreqchar when such a repeat is encountered. The individual
3441 item types that can be repeated set these backoff variables appropriately. */
3442
3443 firstchar = reqchar = zerofirstchar = zeroreqchar = REQ_UNSET;
3444
3445 /* The variable req_caseopt contains either the REQ_CASELESS value
3446 or zero, according to the current setting of the caseless flag. The
3447 REQ_CASELESS leaves the lower 28 bit empty. It is added into the
3448 firstchar or reqchar variables to record the case status of the
3449 value. This is used only for ASCII characters. */
3450
3451 req_caseopt = ((options & PCRE_CASELESS) != 0)? REQ_CASELESS:0;
3452
3453 /* Switch on next character until the end of the branch */
3454
3455 for (;; ptr++)
3456 {
3457 BOOL negate_class;
3458 BOOL should_flip_negation;
3459 BOOL possessive_quantifier;
3460 BOOL is_quantifier;
3461 BOOL is_recurse;
3462 BOOL reset_bracount;
3463 int class_has_8bitchar;
3464 int class_single_char;
3465 int newoptions;
3466 int recno;
3467 int refsign;
3468 int skipbytes;
3469 int subreqchar;
3470 int subfirstchar;
3471 int terminator;
3472 int mclength;
3473 int tempbracount;
3474 pcre_uchar mcbuffer[8];
3475
3476 /* Get next character in the pattern */
3477
3478 c = *ptr;
3479
3480 /* If we are at the end of a nested substitution, revert to the outer level
3481 string. Nesting only happens one level deep. */
3482
3483 if (c == 0 && nestptr != NULL)
3484 {
3485 ptr = nestptr;
3486 nestptr = NULL;
3487 c = *ptr;
3488 }
3489
3490 /* If we are in the pre-compile phase, accumulate the length used for the
3491 previous cycle of this loop. */
3492
3493 if (lengthptr != NULL)
3494 {
3495 #ifdef PCRE_DEBUG
3496 if (code > cd->hwm) cd->hwm = code; /* High water info */
3497 #endif
3498 if (code > cd->start_workspace + cd->workspace_size -
3499 WORK_SIZE_SAFETY_MARGIN) /* Check for overrun */
3500 {
3501 *errorcodeptr = ERR52;
3502 goto FAILED;
3503 }
3504
3505 /* There is at least one situation where code goes backwards: this is the
3506 case of a zero quantifier after a class (e.g. [ab]{0}). At compile time,
3507 the class is simply eliminated. However, it is created first, so we have to
3508 allow memory for it. Therefore, don't ever reduce the length at this point.
3509 */
3510
3511 if (code < last_code) code = last_code;
3512
3513 /* Paranoid check for integer overflow */
3514
3515 if (OFLOW_MAX - *lengthptr < code - last_code)
3516 {
3517 *errorcodeptr = ERR20;
3518 goto FAILED;
3519 }
3520
3521 *lengthptr += (int)(code - last_code);
3522 DPRINTF(("length=%d added %d c=%c (0x%x)\n", *lengthptr,
3523 (int)(code - last_code), c, c));
3524
3525 /* If "previous" is set and it is not at the start of the work space, move
3526 it back to there, in order to avoid filling up the work space. Otherwise,
3527 if "previous" is NULL, reset the current code pointer to the start. */
3528
3529 if (previous != NULL)
3530 {
3531 if (previous > orig_code)
3532 {
3533 memmove(orig_code, previous, IN_UCHARS(code - previous));
3534 code -= previous - orig_code;
3535 previous = orig_code;
3536 }
3537 }
3538 else code = orig_code;
3539
3540 /* Remember where this code item starts so we can pick up the length
3541 next time round. */
3542
3543 last_code = code;
3544 }
3545
3546 /* In the real compile phase, just check the workspace used by the forward
3547 reference list. */
3548
3549 else if (cd->hwm > cd->start_workspace + cd->workspace_size -
3550 WORK_SIZE_SAFETY_MARGIN)
3551 {
3552 *errorcodeptr = ERR52;
3553 goto FAILED;
3554 }
3555
3556 /* If in \Q...\E, check for the end; if not, we have a literal */
3557
3558 if (inescq && c != 0)
3559 {
3560 if (c == CHAR_BACKSLASH && ptr[1] == CHAR_E)
3561 {
3562 inescq = FALSE;
3563 ptr++;
3564 continue;
3565 }
3566 else
3567 {
3568 if (previous_callout != NULL)
3569 {
3570 if (lengthptr == NULL) /* Don't attempt in pre-compile phase */
3571 complete_callout(previous_callout, ptr, cd);
3572 previous_callout = NULL;
3573 }
3574 if ((options & PCRE_AUTO_CALLOUT) != 0)
3575 {
3576 previous_callout = code;
3577 code = auto_callout(code, ptr, cd);
3578 }
3579 goto NORMAL_CHAR;
3580 }
3581 }
3582
3583 /* Fill in length of a previous callout, except when the next thing is
3584 a quantifier. */
3585
3586 is_quantifier =
3587 c == CHAR_ASTERISK || c == CHAR_PLUS || c == CHAR_QUESTION_MARK ||
3588 (c == CHAR_LEFT_CURLY_BRACKET && is_counted_repeat(ptr+1));
3589
3590 if (!is_quantifier && previous_callout != NULL &&
3591 after_manual_callout-- <= 0)
3592 {
3593 if (lengthptr == NULL) /* Don't attempt in pre-compile phase */
3594 complete_callout(previous_callout, ptr, cd);
3595 previous_callout = NULL;
3596 }
3597
3598 /* In extended mode, skip white space and comments. */
3599
3600 if ((options & PCRE_EXTENDED) != 0)
3601 {
3602 if (MAX_255(*ptr) && (cd->ctypes[c] & ctype_space) != 0) continue;
3603 if (c == CHAR_NUMBER_SIGN)
3604 {
3605 ptr++;
3606 while (*ptr != 0)
3607 {
3608 if (IS_NEWLINE(ptr)) { ptr += cd->nllen - 1; break; }
3609 ptr++;
3610 #ifdef SUPPORT_UTF
3611 if (utf) FORWARDCHAR(ptr);
3612 #endif
3613 }
3614 if (*ptr != 0) continue;
3615
3616 /* Else fall through to handle end of string */
3617 c = 0;
3618 }
3619 }
3620
3621 /* No auto callout for quantifiers. */
3622
3623 if ((options & PCRE_AUTO_CALLOUT) != 0 && !is_quantifier)
3624 {
3625 previous_callout = code;
3626 code = auto_callout(code, ptr, cd);
3627 }
3628
3629 switch(c)
3630 {
3631 /* ===================================================================*/
3632 case 0: /* The branch terminates at string end */
3633 case CHAR_VERTICAL_LINE: /* or | or ) */
3634 case CHAR_RIGHT_PARENTHESIS:
3635 *firstcharptr = firstchar;
3636 *reqcharptr = reqchar;
3637 *codeptr = code;
3638 *ptrptr = ptr;
3639 if (lengthptr != NULL)
3640 {
3641 if (OFLOW_MAX - *lengthptr < code - last_code)
3642 {
3643 *errorcodeptr = ERR20;
3644 goto FAILED;
3645 }
3646 *lengthptr += (int)(code - last_code); /* To include callout length */
3647 DPRINTF((">> end branch\n"));
3648 }
3649 return TRUE;
3650
3651
3652 /* ===================================================================*/
3653 /* Handle single-character metacharacters. In multiline mode, ^ disables
3654 the setting of any following char as a first character. */
3655
3656 case CHAR_CIRCUMFLEX_ACCENT:
3657 previous = NULL;
3658 if ((options & PCRE_MULTILINE) != 0)
3659 {
3660 if (firstchar == REQ_UNSET) firstchar = REQ_NONE;
3661 *code++ = OP_CIRCM;
3662 }
3663 else *code++ = OP_CIRC;
3664 break;
3665
3666 case CHAR_DOLLAR_SIGN:
3667 previous = NULL;
3668 *code++ = ((options & PCRE_MULTILINE) != 0)? OP_DOLLM : OP_DOLL;
3669 break;
3670
3671 /* There can never be a first char if '.' is first, whatever happens about
3672 repeats. The value of reqchar doesn't change either. */
3673
3674 case CHAR_DOT:
3675 if (firstchar == REQ_UNSET) firstchar = REQ_NONE;
3676 zerofirstchar = firstchar;
3677 zeroreqchar = reqchar;
3678 previous = code;
3679 *code++ = ((options & PCRE_DOTALL) != 0)? OP_ALLANY: OP_ANY;
3680 break;
3681
3682
3683 /* ===================================================================*/
3684 /* Character classes. If the included characters are all < 256, we build a
3685 32-byte bitmap of the permitted characters, except in the special case
3686 where there is only one such character. For negated classes, we build the
3687 map as usual, then invert it at the end. However, we use a different opcode
3688 so that data characters > 255 can be handled correctly.
3689
3690 If the class contains characters outside the 0-255 range, a different
3691 opcode is compiled. It may optionally have a bit map for characters < 256,
3692 but those above are are explicitly listed afterwards. A flag byte tells
3693 whether the bitmap is present, and whether this is a negated class or not.
3694
3695 In JavaScript compatibility mode, an isolated ']' causes an error. In
3696 default (Perl) mode, it is treated as a data character. */
3697
3698 case CHAR_RIGHT_SQUARE_BRACKET:
3699 if ((cd->external_options & PCRE_JAVASCRIPT_COMPAT) != 0)
3700 {
3701 *errorcodeptr = ERR64;
3702 goto FAILED;
3703 }
3704 goto NORMAL_CHAR;
3705
3706 case CHAR_LEFT_SQUARE_BRACKET:
3707 previous = code;
3708
3709 /* PCRE supports POSIX class stuff inside a class. Perl gives an error if
3710 they are encountered at the top level, so we'll do that too. */
3711
3712 if ((ptr[1] == CHAR_COLON || ptr[1] == CHAR_DOT ||
3713 ptr[1] == CHAR_EQUALS_SIGN) &&
3714 check_posix_syntax(ptr, &tempptr))
3715 {
3716 *errorcodeptr = (ptr[1] == CHAR_COLON)? ERR13 : ERR31;
3717 goto FAILED;
3718 }
3719
3720 /* If the first character is '^', set the negation flag and skip it. Also,
3721 if the first few characters (either before or after ^) are \Q\E or \E we
3722 skip them too. This makes for compatibility with Perl. */
3723
3724 negate_class = FALSE;
3725 for (;;)
3726 {
3727 c = *(++ptr);
3728 if (c == CHAR_BACKSLASH)
3729 {
3730 if (ptr[1] == CHAR_E)
3731 ptr++;
3732 else if (STRNCMP_UC_C8(ptr + 1, STR_Q STR_BACKSLASH STR_E, 3) == 0)
3733 ptr += 3;
3734 else
3735 break;
3736 }
3737 else if (!negate_class && c == CHAR_CIRCUMFLEX_ACCENT)
3738 negate_class = TRUE;
3739 else break;
3740 }
3741
3742 /* Empty classes are allowed in JavaScript compatibility mode. Otherwise,
3743 an initial ']' is taken as a data character -- the code below handles
3744 that. In JS mode, [] must always fail, so generate OP_FAIL, whereas
3745 [^] must match any character, so generate OP_ALLANY. */
3746
3747 if (c == CHAR_RIGHT_SQUARE_BRACKET &&
3748 (cd->external_options & PCRE_JAVASCRIPT_COMPAT) != 0)
3749 {
3750 *code++ = negate_class? OP_ALLANY : OP_FAIL;
3751 if (firstchar == REQ_UNSET) firstchar = REQ_NONE;
3752 zerofirstchar = firstchar;
3753 break;
3754 }
3755
3756 /* If a class contains a negative special such as \S, we need to flip the
3757 negation flag at the end, so that support for characters > 255 works
3758 correctly (they are all included in the class). */
3759
3760 should_flip_negation = FALSE;
3761
3762 /* For optimization purposes, we track some properties of the class.
3763 class_has_8bitchar will be non-zero, if the class contains at least one
3764 < 256 character. class_single_char will be 1 if the class contains only
3765 a single character. */
3766
3767 class_has_8bitchar = 0;
3768 class_single_char = 0;
3769
3770 /* Initialize the 32-char bit map to all zeros. We build the map in a
3771 temporary bit of memory, in case the class contains only 1 character (less
3772 than 256), because in that case the compiled code doesn't use the bit map.
3773 */
3774
3775 memset(classbits, 0, 32 * sizeof(pcre_uint8));
3776
3777 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
3778 xclass = FALSE; /* No chars >= 256 */
3779 class_uchardata = code + LINK_SIZE + 2; /* For UTF-8 items */
3780 class_uchardata_base = class_uchardata; /* For resetting in pass 1 */
3781 #endif
3782
3783 /* Process characters until ] is reached. By writing this as a "do" it
3784 means that an initial ] is taken as a data character. At the start of the
3785 loop, c contains the first byte of the character. */
3786
3787 if (c != 0) do
3788 {
3789 const pcre_uchar *oldptr;
3790
3791 #ifdef SUPPORT_UTF
3792 if (utf && HAS_EXTRALEN(c))
3793 { /* Braces are required because the */
3794 GETCHARLEN(c, ptr, ptr); /* macro generates multiple statements */
3795 }
3796 #endif
3797
3798 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
3799 /* In the pre-compile phase, accumulate the length of any extra
3800 data and reset the pointer. This is so that very large classes that
3801 contain a zillion > 255 characters no longer overwrite the work space
3802 (which is on the stack). */
3803
3804 if (lengthptr != NULL)
3805 {
3806 *lengthptr += class_uchardata - class_uchardata_base;
3807 class_uchardata = class_uchardata_base;
3808 }
3809 #endif
3810
3811 /* Inside \Q...\E everything is literal except \E */
3812
3813 if (inescq)
3814 {
3815 if (c == CHAR_BACKSLASH && ptr[1] == CHAR_E) /* If we are at \E */
3816 {
3817 inescq = FALSE; /* Reset literal state */
3818 ptr++; /* Skip the 'E' */
3819 continue; /* Carry on with next */
3820 }
3821 goto CHECK_RANGE; /* Could be range if \E follows */
3822 }
3823
3824 /* Handle POSIX class names. Perl allows a negation extension of the
3825 form [:^name:]. A square bracket that doesn't match the syntax is
3826 treated as a literal. We also recognize the POSIX constructions
3827 [.ch.] and [=ch=] ("collating elements") and fault them, as Perl
3828 5.6 and 5.8 do. */
3829
3830 if (c == CHAR_LEFT_SQUARE_BRACKET &&
3831 (ptr[1] == CHAR_COLON || ptr[1] == CHAR_DOT ||
3832 ptr[1] == CHAR_EQUALS_SIGN) && check_posix_syntax(ptr, &tempptr))
3833 {
3834 BOOL local_negate = FALSE;
3835 int posix_class, taboffset, tabopt;
3836 register const pcre_uint8 *cbits = cd->cbits;
3837 pcre_uint8 pbits[32];
3838
3839 if (ptr[1] != CHAR_COLON)
3840 {
3841 *errorcodeptr = ERR31;
3842 goto FAILED;
3843 }
3844
3845 ptr += 2;
3846 if (*ptr == CHAR_CIRCUMFLEX_ACCENT)
3847 {
3848 local_negate = TRUE;
3849 should_flip_negation = TRUE; /* Note negative special */
3850 ptr++;
3851 }
3852
3853 posix_class = check_posix_name(ptr, (int)(tempptr - ptr));
3854 if (posix_class < 0)
3855 {
3856 *errorcodeptr = ERR30;
3857 goto FAILED;
3858 }
3859
3860 /* If matching is caseless, upper and lower are converted to
3861 alpha. This relies on the fact that the class table starts with
3862 alpha, lower, upper as the first 3 entries. */
3863
3864 if ((options & PCRE_CASELESS) != 0 && posix_class <= 2)
3865 posix_class = 0;
3866
3867 /* When PCRE_UCP is set, some of the POSIX classes are converted to
3868 different escape sequences that use Unicode properties. */
3869
3870 #ifdef SUPPORT_UCP
3871 if ((options & PCRE_UCP) != 0)
3872 {
3873 int pc = posix_class + ((local_negate)? POSIX_SUBSIZE/2 : 0);
3874 if (posix_substitutes[pc] != NULL)
3875 {
3876 nestptr = tempptr + 1;
3877 ptr = posix_substitutes[pc] - 1;
3878 continue;
3879 }
3880 }
3881 #endif
3882 /* In the non-UCP case, we build the bit map for the POSIX class in a
3883 chunk of local store because we may be adding and subtracting from it,
3884 and we don't want to subtract bits that may be in the main map already.
3885 At the end we or the result into the bit map that is being built. */
3886
3887 posix_class *= 3;
3888
3889 /* Copy in the first table (always present) */
3890
3891 memcpy(pbits, cbits + posix_class_maps[posix_class],
3892 32 * sizeof(pcre_uint8));
3893
3894 /* If there is a second table, add or remove it as required. */
3895
3896 taboffset = posix_class_maps[posix_class + 1];
3897 tabopt = posix_class_maps[posix_class + 2];
3898
3899 if (taboffset >= 0)
3900 {
3901 if (tabopt >= 0)
3902 for (c = 0; c < 32; c++) pbits[c] |= cbits[c + taboffset];
3903 else
3904 for (c = 0; c < 32; c++) pbits[c] &= ~cbits[c + taboffset];
3905 }
3906
3907 /* Not see if we need to remove any special characters. An option
3908 value of 1 removes vertical space and 2 removes underscore. */
3909
3910 if (tabopt < 0) tabopt = -tabopt;
3911 if (tabopt == 1) pbits[1] &= ~0x3c;
3912 else if (tabopt == 2) pbits[11] &= 0x7f;
3913
3914 /* Add the POSIX table or its complement into the main table that is
3915 being built and we are done. */
3916
3917 if (local_negate)
3918 for (c = 0; c < 32; c++) classbits[c] |= ~pbits[c];
3919 else
3920 for (c = 0; c < 32; c++) classbits[c] |= pbits[c];
3921
3922 ptr = tempptr + 1;
3923 /* Every class contains at least one < 256 characters. */
3924 class_has_8bitchar = 1;
3925 /* Every class contains at least two characters. */
3926 class_single_char = 2;
3927 continue; /* End of POSIX syntax handling */
3928 }
3929
3930 /* Backslash may introduce a single character, or it may introduce one
3931 of the specials, which just set a flag. The sequence \b is a special
3932 case. Inside a class (and only there) it is treated as backspace. We
3933 assume that other escapes have more than one character in them, so
3934 speculatively set both class_has_8bitchar and class_single_char bigger
3935 than one. Unrecognized escapes fall through and are either treated
3936 as literal characters (by default), or are faulted if
3937 PCRE_EXTRA is set. */
3938
3939 if (c == CHAR_BACKSLASH)
3940 {
3941 c = check_escape(&ptr, errorcodeptr, cd->bracount, options, TRUE);
3942 if (*errorcodeptr != 0) goto FAILED;
3943
3944 if (-c == ESC_b) c = CHAR_BS; /* \b is backspace in a class */
3945 else if (-c == ESC_N) /* \N is not supported in a class */
3946 {
3947 *errorcodeptr = ERR71;
3948 goto FAILED;
3949 }
3950 else if (-c == ESC_Q) /* Handle start of quoted string */
3951 {
3952 if (ptr[1] == CHAR_BACKSLASH && ptr[2] == CHAR_E)
3953 {
3954 ptr += 2; /* avoid empty string */
3955 }
3956 else inescq = TRUE;
3957 continue;
3958 }
3959 else if (-c == ESC_E) continue; /* Ignore orphan \E */
3960
3961 if (c < 0)
3962 {
3963 register const pcre_uint8 *cbits = cd->cbits;
3964 /* Every class contains at least two < 256 characters. */
3965 class_has_8bitchar++;
3966 /* Every class contains at least two characters. */
3967 class_single_char += 2;
3968
3969 switch (-c)
3970 {
3971 #ifdef SUPPORT_UCP
3972 case ESC_du: /* These are the values given for \d etc */
3973 case ESC_DU: /* when PCRE_UCP is set. We replace the */
3974 case ESC_wu: /* escape sequence with an appropriate \p */
3975 case ESC_WU: /* or \P to test Unicode properties instead */
3976 case ESC_su: /* of the default ASCII testing. */
3977 case ESC_SU:
3978 nestptr = ptr;
3979 ptr = substitutes[-c - ESC_DU] - 1; /* Just before substitute */
3980 class_has_8bitchar--; /* Undo! */
3981 continue;
3982 #endif
3983 case ESC_d:
3984 for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_digit];
3985 continue;
3986
3987 case ESC_D:
3988 should_flip_negation = TRUE;
3989 for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_digit];
3990 continue;
3991
3992 case ESC_w:
3993 for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_word];
3994 continue;
3995
3996 case ESC_W:
3997 should_flip_negation = TRUE;
3998 for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_word];
3999 continue;
4000
4001 /* Perl 5.004 onwards omits VT from \s, but we must preserve it
4002 if it was previously set by something earlier in the character
4003 class. */
4004
4005 case ESC_s:
4006 classbits[0] |= cbits[cbit_space];
4007 classbits[1] |= cbits[cbit_space+1] & ~0x08;
4008 for (c = 2; c < 32; c++) classbits[c] |= cbits[c+cbit_space];
4009 continue;
4010
4011 case ESC_S:
4012 should_flip_negation = TRUE;
4013 for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_space];
4014 classbits[1] |= 0x08; /* Perl 5.004 onwards omits VT from \s */
4015 continue;
4016
4017 case ESC_h:
4018 SETBIT(classbits, 0x09); /* VT */
4019 SETBIT(classbits, 0x20); /* SPACE */
4020 SETBIT(classbits, 0xa0); /* NSBP */
4021 #ifdef SUPPORT_UTF
4022 if (utf)
4023 {
4024 xclass = TRUE;
4025 *class_uchardata++ = XCL_SINGLE;
4026 class_uchardata += PRIV(ord2utf)(0x1680, class_uchardata);
4027 *class_uchardata++ = XCL_SINGLE;
4028 class_uchardata += PRIV(ord2utf)(0x180e, class_uchardata);
4029 *class_uchardata++ = XCL_RANGE;
4030 class_uchardata += PRIV(ord2utf)(0x2000, class_uchardata);
4031 class_uchardata += PRIV(ord2utf)(0x200A, class_uchardata);
4032 *class_uchardata++ = XCL_SINGLE;
4033 class_uchardata += PRIV(ord2utf)(0x202f, class_uchardata);
4034 *class_uchardata++ = XCL_SINGLE;
4035 class_uchardata += PRIV(ord2utf)(0x205f, class_uchardata);
4036 *class_uchardata++ = XCL_SINGLE;
4037 class_uchardata += PRIV(ord2utf)(0x3000, class_uchardata);
4038 }
4039 #endif
4040 continue;
4041
4042 case ESC_H:
4043 for (c = 0; c < 32; c++)
4044 {
4045 int x = 0xff;
4046 switch (c)
4047 {
4048 case 0x09/8: x ^= 1 << (0x09%8); break;
4049 case 0x20/8: x ^= 1 << (0x20%8); break;
4050 case 0xa0/8: x ^= 1 << (0xa0%8); break;
4051 default: break;
4052 }
4053 classbits[c] |= x;
4054 }
4055
4056 #ifdef SUPPORT_UTF
4057 if (utf)
4058 {
4059 xclass = TRUE;
4060 *class_uchardata++ = XCL_RANGE;
4061 class_uchardata += PRIV(ord2utf)(0x0100, class_uchardata);
4062 class_uchardata += PRIV(ord2utf)(0x167f, class_uchardata);
4063 *class_uchardata++ = XCL_RANGE;
4064 class_uchardata += PRIV(ord2utf)(0x1681, class_uchardata);
4065 class_uchardata += PRIV(ord2utf)(0x180d, class_uchardata);
4066 *class_uchardata++ = XCL_RANGE;
4067 class_uchardata += PRIV(ord2utf)(0x180f, class_uchardata);
4068 class_uchardata += PRIV(ord2utf)(0x1fff, class_uchardata);
4069 *class_uchardata++ = XCL_RANGE;
4070 class_uchardata += PRIV(ord2utf)(0x200B, class_uchardata);
4071 class_uchardata += PRIV(ord2utf)(0x202e, class_uchardata);
4072 *class_uchardata++ = XCL_RANGE;
4073 class_uchardata += PRIV(ord2utf)(0x2030, class_uchardata);
4074 class_uchardata += PRIV(ord2utf)(0x205e, class_uchardata);
4075 *class_uchardata++ = XCL_RANGE;
4076 class_uchardata += PRIV(ord2utf)(0x2060, class_uchardata);
4077 class_uchardata += PRIV(ord2utf)(0x2fff, class_uchardata);
4078 *class_uchardata++ = XCL_RANGE;
4079 class_uchardata += PRIV(ord2utf)(0x3001, class_uchardata);
4080 class_uchardata += PRIV(ord2utf)(0x10ffff, class_uchardata);
4081 }
4082 #endif
4083 continue;
4084
4085 case ESC_v:
4086 SETBIT(classbits, 0x0a); /* LF */
4087 SETBIT(classbits, 0x0b); /* VT */
4088 SETBIT(classbits, 0x0c); /* FF */
4089 SETBIT(classbits, 0x0d); /* CR */
4090 SETBIT(classbits, 0x85); /* NEL */
4091 #ifdef SUPPORT_UTF
4092 if (utf)
4093 {
4094 xclass = TRUE;
4095 *class_uchardata++ = XCL_RANGE;
4096 class_uchardata += PRIV(ord2utf)(0x2028, class_uchardata);
4097 class_uchardata += PRIV(ord2utf)(0x2029, class_uchardata);
4098 }
4099 #endif
4100 continue;
4101
4102 case ESC_V:
4103 for (c = 0; c < 32; c++)
4104 {
4105 int x = 0xff;
4106 switch (c)
4107 {
4108 case 0x0a/8: x ^= 1 << (0x0a%8);
4109 x ^= 1 << (0x0b%8);
4110 x ^= 1 << (0x0c%8);
4111 x ^= 1 << (0x0d%8);
4112 break;
4113 case 0x85/8: x ^= 1 << (0x85%8); break;
4114 default: break;
4115 }
4116 classbits[c] |= x;
4117 }
4118
4119 #ifdef SUPPORT_UTF
4120 if (utf)
4121 {
4122 xclass = TRUE;
4123 *class_uchardata++ = XCL_RANGE;
4124 class_uchardata += PRIV(ord2utf)(0x0100, class_uchardata);
4125 class_uchardata += PRIV(ord2utf)(0x2027, class_uchardata);
4126 *class_uchardata++ = XCL_RANGE;
4127 class_uchardata += PRIV(ord2utf)(0x2029, class_uchardata);
4128 class_uchardata += PRIV(ord2utf)(0x10ffff, class_uchardata);
4129 }
4130 #endif
4131 continue;
4132
4133 #ifdef SUPPORT_UCP
4134 case ESC_p:
4135 case ESC_P:
4136 {
4137 BOOL negated;
4138 int pdata;
4139 int ptype = get_ucp(&ptr, &negated, &pdata, errorcodeptr);
4140 if (ptype < 0) goto FAILED;
4141 xclass = TRUE;
4142 *class_uchardata++ = ((-c == ESC_p) != negated)?
4143 XCL_PROP : XCL_NOTPROP;
4144 *class_uchardata++ = ptype;
4145 *class_uchardata++ = pdata;
4146 class_has_8bitchar--; /* Undo! */
4147 continue;
4148 }
4149 #endif
4150 /* Unrecognized escapes are faulted if PCRE is running in its
4151 strict mode. By default, for compatibility with Perl, they are
4152 treated as literals. */
4153
4154 default:
4155 if ((options & PCRE_EXTRA) != 0)
4156 {
4157 *errorcodeptr = ERR7;
4158 goto FAILED;
4159 }
4160 class_has_8bitchar--; /* Undo the speculative increase. */
4161 class_single_char -= 2; /* Undo the speculative increase. */
4162 c = *ptr; /* Get the final character and fall through */
4163 break;
4164 }
4165 }
4166
4167 /* Fall through if we have a single character (c >= 0). This may be
4168 greater than 256. */
4169
4170 } /* End of backslash handling */
4171
4172 /* A single character may be followed by '-' to form a range. However,
4173 Perl does not permit ']' to be the end of the range. A '-' character
4174 at the end is treated as a literal. Perl ignores orphaned \E sequences
4175 entirely. The code for handling \Q and \E is messy. */
4176
4177 CHECK_RANGE:
4178 while (ptr[1] == CHAR_BACKSLASH && ptr[2] == CHAR_E)
4179 {
4180 inescq = FALSE;
4181 ptr += 2;
4182 }
4183
4184 oldptr = ptr;
4185
4186 /* Remember \r or \n */
4187
4188 if (c == CHAR_CR || c == CHAR_NL) cd->external_flags |= PCRE_HASCRORLF;
4189
4190 /* Check for range */
4191
4192 if (!inescq && ptr[1] == CHAR_MINUS)
4193 {
4194 int d;
4195 ptr += 2;
4196 while (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_E) ptr += 2;
4197
4198 /* If we hit \Q (not followed by \E) at this point, go into escaped
4199 mode. */
4200
4201 while (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_Q)
4202 {
4203 ptr += 2;
4204 if (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_E)
4205 { ptr += 2; continue; }
4206 inescq = TRUE;
4207 break;
4208 }
4209
4210 if (*ptr == 0 || (!inescq && *ptr == CHAR_RIGHT_SQUARE_BRACKET))
4211 {
4212 ptr = oldptr;
4213 goto LONE_SINGLE_CHARACTER;
4214 }
4215
4216 #ifdef SUPPORT_UTF
4217 if (utf)
4218 { /* Braces are required because the */
4219 GETCHARLEN(d, ptr, ptr); /* macro generates multiple statements */
4220 }
4221 else
4222 #endif
4223 d = *ptr; /* Not UTF-8 mode */
4224
4225 /* The second part of a range can be a single-character escape, but
4226 not any of the other escapes. Perl 5.6 treats a hyphen as a literal
4227 in such circumstances. */
4228
4229 if (!inescq && d == CHAR_BACKSLASH)
4230 {
4231 d = check_escape(&ptr, errorcodeptr, cd->bracount, options, TRUE);
4232 if (*errorcodeptr != 0) goto FAILED;
4233
4234 /* \b is backspace; any other special means the '-' was literal */
4235
4236 if (d < 0)
4237 {
4238 if (d == -ESC_b) d = CHAR_BS; else
4239 {
4240 ptr = oldptr;
4241 goto LONE_SINGLE_CHARACTER; /* A few lines below */
4242 }
4243 }
4244 }
4245
4246 /* Check that the two values are in the correct order. Optimize
4247 one-character ranges */
4248
4249 if (d < c)
4250 {
4251 *errorcodeptr = ERR8;
4252 goto FAILED;
4253 }
4254
4255 if (d == c) goto LONE_SINGLE_CHARACTER; /* A few lines below */
4256
4257 /* Remember \r or \n */
4258
4259 if (d == CHAR_CR || d == CHAR_NL) cd->external_flags |= PCRE_HASCRORLF;
4260
4261 /* Since we found a character range, single character optimizations
4262 cannot be done anymore. */
4263 class_single_char = 2;
4264
4265 /* In UTF-8 mode, if the upper limit is > 255, or > 127 for caseless
4266 matching, we have to use an XCLASS with extra data items. Caseless
4267 matching for characters > 127 is available only if UCP support is
4268 available. */
4269
4270 #if defined SUPPORT_UTF && !(defined COMPILE_PCRE8)
4271 if ((d > 255) || (utf && ((options & PCRE_CASELESS) != 0 && d > 127)))
4272 #elif defined SUPPORT_UTF
4273 if (utf && (d > 255 || ((options & PCRE_CASELESS) != 0 && d > 127)))
4274 #elif !(defined COMPILE_PCRE8)
4275 if (d > 255)
4276 #endif
4277 #if defined SUPPORT_UTF || !(defined COMPILE_PCRE8)
4278 {
4279 xclass = TRUE;
4280
4281 /* With UCP support, we can find the other case equivalents of
4282 the relevant characters. There may be several ranges. Optimize how
4283 they fit with the basic range. */
4284
4285 #ifdef SUPPORT_UCP
4286 #ifndef COMPILE_PCRE8
4287 if (utf && (options & PCRE_CASELESS) != 0)
4288 #else
4289 if ((options & PCRE_CASELESS) != 0)
4290 #endif
4291 {
4292 unsigned int occ, ocd;
4293 unsigned int cc = c;
4294 unsigned int origd = d;
4295 while (get_othercase_range(&cc, origd, &occ, &ocd))
4296 {
4297 if (occ >= (unsigned int)c &&
4298 ocd <= (unsigned int)d)
4299 continue; /* Skip embedded ranges */
4300
4301 if (occ < (unsigned int)c &&
4302 ocd >= (unsigned int)c - 1) /* Extend the basic range */
4303 { /* if there is overlap, */
4304 c = occ; /* noting that if occ < c */
4305 continue; /* we can't have ocd > d */
4306 } /* because a subrange is */
4307 if (ocd > (unsigned int)d &&
4308 occ <= (unsigned int)d + 1) /* always shorter than */
4309 { /* the basic range. */
4310 d = ocd;
4311 continue;
4312 }
4313
4314 if (occ == ocd)
4315 {
4316 *class_uchardata++ = XCL_SINGLE;
4317 }
4318 else
4319 {
4320 *class_uchardata++ = XCL_RANGE;
4321 class_uchardata += PRIV(ord2utf)(occ, class_uchardata);
4322 }
4323 class_uchardata += PRIV(ord2utf)(ocd, class_uchardata);
4324 }
4325 }
4326 #endif /* SUPPORT_UCP */
4327
4328 /* Now record the original range, possibly modified for UCP caseless
4329 overlapping ranges. */
4330
4331 *class_uchardata++ = XCL_RANGE;
4332 #ifdef SUPPORT_UTF
4333 #ifndef COMPILE_PCRE8
4334 if (utf)
4335 {
4336 class_uchardata += PRIV(ord2utf)(c, class_uchardata);
4337 class_uchardata += PRIV(ord2utf)(d, class_uchardata);
4338 }
4339 else
4340 {
4341 *class_uchardata++ = c;
4342 *class_uchardata++ = d;
4343 }
4344 #else
4345 class_uchardata += PRIV(ord2utf)(c, class_uchardata);
4346 class_uchardata += PRIV(ord2utf)(d, class_uchardata);
4347 #endif
4348 #else /* SUPPORT_UTF */
4349 *class_uchardata++ = c;
4350 *class_uchardata++ = d;
4351 #endif /* SUPPORT_UTF */
4352
4353 /* With UCP support, we are done. Without UCP support, there is no
4354 caseless matching for UTF characters > 127; we can use the bit map
4355 for the smaller ones. As for 16 bit characters without UTF, we
4356 can still use */
4357
4358 #ifdef SUPPORT_UCP
4359 #ifndef COMPILE_PCRE8
4360 if (utf)
4361 #endif
4362 continue; /* With next character in the class */
4363 #endif /* SUPPORT_UCP */
4364
4365 #if defined SUPPORT_UTF && !defined(SUPPORT_UCP) && !(defined COMPILE_PCRE8)
4366 if (utf)
4367 {
4368 if ((options & PCRE_CASELESS) == 0 || c > 127) continue;
4369 /* Adjust upper limit and fall through to set up the map */
4370 d = 127;
4371 }
4372 else
4373 {
4374 if (c > 255) continue;
4375 /* Adjust upper limit and fall through to set up the map */
4376 d = 255;
4377 }
4378 #elif defined SUPPORT_UTF && !defined(SUPPORT_UCP)
4379 if ((options & PCRE_CASELESS) == 0 || c > 127) continue;
4380 /* Adjust upper limit and fall through to set up the map */
4381 d = 127;
4382 #else
4383 if (c > 255) continue;
4384 /* Adjust upper limit and fall through to set up the map */
4385 d = 255;
4386 #endif /* SUPPORT_UTF && !SUPPORT_UCP && !COMPILE_PCRE8 */
4387 }
4388 #endif /* SUPPORT_UTF || !COMPILE_PCRE8 */
4389
4390 /* We use the bit map for 8 bit mode, or when the characters fall
4391 partially or entirely to [0-255] ([0-127] for UCP) ranges. */
4392
4393 class_has_8bitchar = 1;
4394
4395 /* We can save a bit of time by skipping this in the pre-compile. */
4396
4397 if (lengthptr == NULL) for (; c <= d; c++)
4398 {
4399 classbits[c/8] |= (1 << (c&7));
4400 if ((options & PCRE_CASELESS) != 0)
4401 {
4402 int uc = cd->fcc[c]; /* flip case */
4403 classbits[uc/8] |= (1 << (uc&7));
4404 }
4405 }
4406
4407 continue; /* Go get the next char in the class */
4408 }
4409
4410 /* Handle a lone single character - we can get here for a normal
4411 non-escape char, or after \ that introduces a single character or for an
4412 apparent range that isn't. */
4413
4414 LONE_SINGLE_CHARACTER:
4415
4416 /* Only the value of 1 matters for class_single_char. */
4417 if (class_single_char < 2) class_single_char++;
4418
4419 /* If class_charcount is 1, we saw precisely one character. As long as
4420 there were no negated characters >= 128 and there was no use of \p or \P,
4421 in other words, no use of any XCLASS features, we can optimize.
4422
4423 In UTF-8 mode, we can optimize the negative case only if there were no
4424 characters >= 128 because OP_NOT and the related opcodes like OP_NOTSTAR
4425 operate on single-bytes characters only. This is an historical hangover.
4426 Maybe one day we can tidy these opcodes to handle multi-byte characters.
4427
4428 The optimization throws away the bit map. We turn the item into a
4429 1-character OP_CHAR[I] if it's positive, or OP_NOT[I] if it's negative.
4430 Note that OP_NOT[I] does not support multibyte characters. In the positive
4431 case, it can cause firstchar to be set. Otherwise, there can be no first
4432 char if this item is first, whatever repeat count may follow. In the case
4433 of reqchar, save the previous value for reinstating. */
4434
4435 #ifdef SUPPORT_UTF
4436 if (class_single_char == 1 && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET
4437 && (!utf || !negate_class || c < (MAX_VALUE_FOR_SINGLE_CHAR + 1)))
4438 #else
4439 if (class_single_char == 1 && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
4440 #endif
4441 {
4442 ptr++;
4443 zeroreqchar = reqchar;
4444
4445 /* The OP_NOT[I] opcodes work on single characters only. */
4446
4447 if (negate_class)
4448 {
4449 if (firstchar == REQ_UNSET) firstchar = REQ_NONE;
4450 zerofirstchar = firstchar;
4451 *code++ = ((options & PCRE_CASELESS) != 0)? OP_NOTI: OP_NOT;
4452 *code++ = c;
4453 goto NOT_CHAR;
4454 }
4455
4456 /* For a single, positive character, get the value into mcbuffer, and
4457 then we can handle this with the normal one-character code. */
4458
4459 #ifdef SUPPORT_UTF
4460 if (utf && c > MAX_VALUE_FOR_SINGLE_CHAR)
4461 mclength = PRIV(ord2utf)(c, mcbuffer);
4462 else
4463 #endif
4464 {
4465 mcbuffer[0] = c;
4466 mclength = 1;
4467 }
4468 goto ONE_CHAR;
4469 } /* End of 1-char optimization */
4470
4471 /* Handle a character that cannot go in the bit map. */
4472
4473 #if defined SUPPORT_UTF && !(defined COMPILE_PCRE8)
4474 if ((c > 255) || (utf && ((options & PCRE_CASELESS) != 0 && c > 127)))
4475 #elif defined SUPPORT_UTF
4476 if (utf && (c > 255 || ((options & PCRE_CASELESS) != 0 && c > 127)))
4477 #elif !(defined COMPILE_PCRE8)
4478 if (c > 255)
4479 #endif
4480
4481 #if defined SUPPORT_UTF || !(defined COMPILE_PCRE8)
4482 {
4483 xclass = TRUE;
4484 *class_uchardata++ = XCL_SINGLE;
4485 #ifdef SUPPORT_UTF
4486 #ifndef COMPILE_PCRE8
4487 /* In non 8 bit mode, we can get here even if we are not in UTF mode. */
4488 if (!utf)
4489 *class_uchardata++ = c;
4490 else
4491 #endif
4492 class_uchardata += PRIV(ord2utf)(c, class_uchardata);
4493 #else /* SUPPORT_UTF */
4494 *class_uchardata++ = c;
4495 #endif /* SUPPORT_UTF */
4496
4497 #ifdef SUPPORT_UCP
4498 #ifdef COMPILE_PCRE8
4499 if ((options & PCRE_CASELESS) != 0)
4500 #else
4501 /* In non 8 bit mode, we can get here even if we are not in UTF mode. */
4502 if (utf && (options & PCRE_CASELESS) != 0)
4503 #endif
4504 {
4505 unsigned int othercase;
4506 if ((othercase = UCD_OTHERCASE(c)) != c)
4507 {
4508 *class_uchardata++ = XCL_SINGLE;
4509 class_uchardata += PRIV(ord2utf)(othercase, class_uchardata);
4510 }
4511 }
4512 #endif /* SUPPORT_UCP */
4513
4514 }
4515 else
4516 #endif /* SUPPORT_UTF || COMPILE_PCRE16 */
4517
4518 /* Handle a single-byte character */
4519 {
4520 class_has_8bitchar = 1;
4521 classbits[c/8] |= (1 << (c&7));
4522 if ((options & PCRE_CASELESS) != 0)
4523 {
4524 c = cd->fcc[c]; /* flip case */
4525 classbits[c/8] |= (1 << (c&7));
4526 }
4527 }
4528 }
4529
4530 /* Loop until ']' reached. This "while" is the end of the "do" far above.
4531 If we are at the end of an internal nested string, revert to the outer
4532 string. */
4533
4534 while (((c = *(++ptr)) != 0 ||
4535 (nestptr != NULL &&
4536 (ptr = nestptr, nestptr = NULL, c = *(++ptr)) != 0)) &&
4537 (c != CHAR_RIGHT_SQUARE_BRACKET || inescq));
4538
4539 /* Check for missing terminating ']' */
4540
4541 if (c == 0)
4542 {
4543 *errorcodeptr = ERR6;
4544 goto FAILED;
4545 }
4546
4547 /* If this is the first thing in the branch, there can be no first char
4548 setting, whatever the repeat count. Any reqchar setting must remain
4549 unchanged after any kind of repeat. */
4550
4551 if (firstchar == REQ_UNSET) firstchar = REQ_NONE;
4552 zerofirstchar = firstchar;
4553 zeroreqchar = reqchar;
4554
4555 /* If there are characters with values > 255, we have to compile an
4556 extended class, with its own opcode, unless there was a negated special
4557 such as \S in the class, and PCRE_UCP is not set, because in that case all
4558 characters > 255 are in the class, so any that were explicitly given as
4559 well can be ignored. If (when there are explicit characters > 255 that must
4560 be listed) there are no characters < 256, we can omit the bitmap in the
4561 actual compiled code. */
4562
4563 #ifdef SUPPORT_UTF
4564 if (xclass && (!should_flip_negation || (options & PCRE_UCP) != 0))
4565 #endif
4566 #ifndef COMPILE_PCRE8
4567 if (xclass && !should_flip_negation)
4568 #endif
4569 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
4570 {
4571 *class_uchardata++ = XCL_END; /* Marks the end of extra data */
4572 *code++ = OP_XCLASS;
4573 code += LINK_SIZE;
4574 *code = negate_class? XCL_NOT:0;
4575
4576 /* If the map is required, move up the extra data to make room for it;
4577 otherwise just move the code pointer to the end of the extra data. */
4578
4579 if (class_has_8bitchar > 0)
4580 {
4581 *code++ |= XCL_MAP;
4582 memmove(code + (32 / sizeof(pcre_uchar)), code,
4583 IN_UCHARS(class_uchardata - code));
4584 memcpy(code, classbits, 32);
4585 code = class_uchardata + (32 / sizeof(pcre_uchar));
4586 }
4587 else code = class_uchardata;
4588
4589 /* Now fill in the complete length of the item */
4590
4591 PUT(previous, 1, (int)(code - previous));
4592 break; /* End of class handling */
4593 }
4594 #endif
4595
4596 /* If there are no characters > 255, or they are all to be included or
4597 excluded, set the opcode to OP_CLASS or OP_NCLASS, depending on whether the
4598 whole class was negated and whether there were negative specials such as \S
4599 (non-UCP) in the class. Then copy the 32-byte map into the code vector,
4600 negating it if necessary. */
4601
4602 *code++ = (negate_class == should_flip_negation) ? OP_CLASS : OP_NCLASS;
4603 if (lengthptr == NULL) /* Save time in the pre-compile phase */
4604 {
4605 if (negate_class)
4606 for (c = 0; c < 32; c++) classbits[c] = ~classbits[c];
4607 memcpy(code, classbits, 32);
4608 }
4609 code += 32 / sizeof(pcre_uchar);
4610 NOT_CHAR:
4611 break;
4612
4613
4614 /* ===================================================================*/
4615 /* Various kinds of repeat; '{' is not necessarily a quantifier, but this
4616 has been tested above. */
4617
4618 case CHAR_LEFT_CURLY_BRACKET:
4619 if (!is_quantifier) goto NORMAL_CHAR;
4620 ptr = read_repeat_counts(ptr+1, &repeat_min, &repeat_max, errorcodeptr);
4621 if (*errorcodeptr != 0) goto FAILED;
4622 goto REPEAT;
4623
4624 case CHAR_ASTERISK:
4625 repeat_min = 0;
4626 repeat_max = -1;
4627 goto REPEAT;
4628
4629 case CHAR_PLUS:
4630 repeat_min = 1;
4631 repeat_max = -1;
4632 goto REPEAT;
4633
4634 case CHAR_QUESTION_MARK:
4635 repeat_min = 0;
4636 repeat_max = 1;
4637
4638 REPEAT:
4639 if (previous == NULL)
4640 {
4641 *errorcodeptr = ERR9;
4642 goto FAILED;
4643 }
4644
4645 if (repeat_min == 0)
4646 {
4647 firstchar = zerofirstchar; /* Adjust for zero repeat */
4648 reqchar = zeroreqchar; /* Ditto */
4649 }
4650
4651 /* Remember whether this is a variable length repeat */
4652
4653 reqvary = (repeat_min == repeat_max)? 0 : REQ_VARY;
4654
4655 op_type = 0; /* Default single-char op codes */
4656 possessive_quantifier = FALSE; /* Default not possessive quantifier */
4657
4658 /* Save start of previous item, in case we have to move it up in order to
4659 insert something before it. */
4660
4661 tempcode = previous;
4662
4663 /* If the next character is '+', we have a possessive quantifier. This
4664 implies greediness, whatever the setting of the PCRE_UNGREEDY option.
4665 If the next character is '?' this is a minimizing repeat, by default,
4666 but if PCRE_UNGREEDY is set, it works the other way round. We change the
4667 repeat type to the non-default. */
4668
4669 if (ptr[1] == CHAR_PLUS)
4670 {
4671 repeat_type = 0; /* Force greedy */
4672 possessive_quantifier = TRUE;
4673 ptr++;
4674 }
4675 else if (ptr[1] == CHAR_QUESTION_MARK)
4676 {
4677 repeat_type = greedy_non_default;
4678 ptr++;
4679 }
4680 else repeat_type = greedy_default;
4681
4682 /* If previous was a recursion call, wrap it in atomic brackets so that
4683 previous becomes the atomic group. All recursions were so wrapped in the
4684 past, but it no longer happens for non-repeated recursions. In fact, the
4685 repeated ones could be re-implemented independently so as not to need this,
4686 but for the moment we rely on the code for repeating groups. */
4687
4688 if (*previous == OP_RECURSE)
4689 {
4690 memmove(previous + 1 + LINK_SIZE, previous, IN_UCHARS(1 + LINK_SIZE));
4691 *previous = OP_ONCE;
4692 PUT(previous, 1, 2 + 2*LINK_SIZE);
4693 previous[2 + 2*LINK_SIZE] = OP_KET;
4694 PUT(previous, 3 + 2*LINK_SIZE, 2 + 2*LINK_SIZE);
4695 code += 2 + 2 * LINK_SIZE;
4696 length_prevgroup = 3 + 3*LINK_SIZE;
4697
4698 /* When actually compiling, we need to check whether this was a forward
4699 reference, and if so, adjust the offset. */
4700
4701 if (lengthptr == NULL && cd->hwm >= cd->start_workspace + LINK_SIZE)
4702 {
4703 int offset = GET(cd->hwm, -LINK_SIZE);
4704 if (offset == previous + 1 - cd->start_code)
4705 PUT(cd->hwm, -LINK_SIZE, offset + 1 + LINK_SIZE);
4706 }
4707 }
4708
4709 /* Now handle repetition for the different types of item. */
4710
4711 /* If previous was a character match, abolish the item and generate a
4712 repeat item instead. If a char item has a minumum of more than one, ensure
4713 that it is set in reqchar - it might not be if a sequence such as x{3} is
4714 the first thing in a branch because the x will have gone into firstchar
4715 instead. */
4716
4717 if (*previous == OP_CHAR || *previous == OP_CHARI)
4718 {
4719 op_type = (*previous == OP_CHAR)? 0 : OP_STARI - OP_STAR;
4720
4721 /* Deal with UTF characters that take up more than one character. It's
4722 easier to write this out separately than try to macrify it. Use c to
4723 hold the length of the character in bytes, plus UTF_LENGTH to flag that
4724 it's a length rather than a small character. */
4725
4726 #ifdef SUPPORT_UTF
4727 if (utf && NOT_FIRSTCHAR(code[-1]))
4728 {
4729 pcre_uchar *lastchar = code - 1;
4730 BACKCHAR(lastchar);
4731 c = (int)(code - lastchar); /* Length of UTF-8 character */
4732 memcpy(utf_chars, lastchar, IN_UCHARS(c)); /* Save the char */
4733 c |= UTF_LENGTH; /* Flag c as a length */
4734 }
4735 else
4736 #endif /* SUPPORT_UTF */
4737
4738 /* Handle the case of a single charater - either with no UTF support, or
4739 with UTF disabled, or for a single character UTF character. */
4740 {
4741 c = code[-1];
4742 if (repeat_min > 1) reqchar = c | req_caseopt | cd->req_varyopt;
4743 }
4744
4745 /* If the repetition is unlimited, it pays to see if the next thing on
4746 the line is something that cannot possibly match this character. If so,
4747 automatically possessifying this item gains some performance in the case
4748 where the match fails. */
4749
4750 if (!possessive_quantifier &&
4751 repeat_max < 0 &&
4752 check_auto_possessive(previous, utf, ptr + 1, options, cd))
4753 {
4754 repeat_type = 0; /* Force greedy */
4755 possessive_quantifier = TRUE;
4756 }
4757
4758 goto OUTPUT_SINGLE_REPEAT; /* Code shared with single character types */
4759 }
4760
4761 /* If previous was a single negated character ([^a] or similar), we use
4762 one of the special opcodes, replacing it. The code is shared with single-
4763 character repeats by setting opt_type to add a suitable offset into
4764 repeat_type. We can also test for auto-possessification. OP_NOT and OP_NOTI
4765 are currently used only for single-byte chars. */
4766
4767 else if (*previous == OP_NOT || *previous == OP_NOTI)
4768 {
4769 op_type = ((*previous == OP_NOT)? OP_NOTSTAR : OP_NOTSTARI) - OP_STAR;
4770 c = previous[1];
4771 if (!possessive_quantifier &&
4772 repeat_max < 0 &&
4773 check_auto_possessive(previous, utf, ptr + 1, options, cd))
4774 {
4775 repeat_type = 0; /* Force greedy */
4776 possessive_quantifier = TRUE;
4777 }
4778 goto OUTPUT_SINGLE_REPEAT;
4779 }
4780
4781 /* If previous was a character type match (\d or similar), abolish it and
4782 create a suitable repeat item. The code is shared with single-character
4783 repeats by setting op_type to add a suitable offset into repeat_type. Note
4784 the the Unicode property types will be present only when SUPPORT_UCP is
4785 defined, but we don't wrap the little bits of code here because it just
4786 makes it horribly messy. */
4787
4788 else if (*previous < OP_EODN)
4789 {
4790 pcre_uchar *oldcode;
4791 int prop_type, prop_value;
4792 op_type = OP_TYPESTAR - OP_STAR; /* Use type opcodes */
4793 c = *previous;
4794
4795 if (!possessive_quantifier &&
4796 repeat_max < 0 &&
4797 check_auto_possessive(previous, utf, ptr + 1, options, cd))
4798 {
4799 repeat_type = 0; /* Force greedy */
4800 possessive_quantifier = TRUE;
4801 }
4802
4803 OUTPUT_SINGLE_REPEAT:
4804 if (*previous == OP_PROP || *previous == OP_NOTPROP)
4805 {
4806 prop_type = previous[1];
4807 prop_value = previous[2];
4808 }
4809 else prop_type = prop_value = -1;
4810
4811 oldcode = code;
4812 code = previous; /* Usually overwrite previous item */
4813
4814 /* If the maximum is zero then the minimum must also be zero; Perl allows
4815 this case, so we do too - by simply omitting the item altogether. */
4816
4817 if (repeat_max == 0) goto END_REPEAT;
4818
4819 /*--------------------------------------------------------------------*/
4820 /* This code is obsolete from release 8.00; the restriction was finally
4821 removed: */
4822
4823 /* All real repeats make it impossible to handle partial matching (maybe
4824 one day we will be able to remove this restriction). */
4825
4826 /* if (repeat_max != 1) cd->external_flags |= PCRE_NOPARTIAL; */
4827 /*--------------------------------------------------------------------*/
4828
4829 /* Combine the op_type with the repeat_type */
4830
4831 repeat_type += op_type;
4832
4833 /* A minimum of zero is handled either as the special case * or ?, or as
4834 an UPTO, with the maximum given. */
4835
4836 if (repeat_min == 0)
4837 {
4838 if (repeat_max == -1) *code++ = OP_STAR + repeat_type;
4839 else if (repeat_max == 1) *code++ = OP_QUERY + repeat_type;
4840 else
4841 {
4842 *code++ = OP_UPTO + repeat_type;
4843 PUT2INC(code, 0, repeat_max);
4844 }
4845 }
4846
4847 /* A repeat minimum of 1 is optimized into some special cases. If the
4848 maximum is unlimited, we use OP_PLUS. Otherwise, the original item is
4849 left in place and, if the maximum is greater than 1, we use OP_UPTO with
4850 one less than the maximum. */
4851
4852 else if (repeat_min == 1)
4853 {
4854 if (repeat_max == -1)
4855 *code++ = OP_PLUS + repeat_type;
4856 else
4857 {
4858 code = oldcode; /* leave previous item in place */
4859 if (repeat_max == 1) goto END_REPEAT;
4860 *code++ = OP_UPTO + repeat_type;
4861 PUT2INC(code, 0, repeat_max - 1);
4862 }
4863 }
4864
4865 /* The case {n,n} is just an EXACT, while the general case {n,m} is
4866 handled as an EXACT followed by an UPTO. */
4867
4868 else
4869 {
4870 *code++ = OP_EXACT + op_type; /* NB EXACT doesn't have repeat_type */
4871 PUT2INC(code, 0, repeat_min);
4872
4873 /* If the maximum is unlimited, insert an OP_STAR. Before doing so,
4874 we have to insert the character for the previous code. For a repeated
4875 Unicode property match, there are two extra bytes that define the
4876 required property. In UTF-8 mode, long characters have their length in
4877 c, with the UTF_LENGTH bit as a flag. */
4878
4879 if (repeat_max < 0)
4880 {
4881 #ifdef SUPPORT_UTF
4882 if (utf && (c & UTF_LENGTH) != 0)
4883 {
4884 memcpy(code, utf_chars, IN_UCHARS(c & 7));
4885 code += c & 7;
4886 }
4887 else
4888 #endif
4889 {
4890 *code++ = c;
4891 if (prop_type >= 0)
4892 {
4893 *code++ = prop_type;
4894 *code++ = prop_value;
4895 }
4896 }
4897 *code++ = OP_STAR + repeat_type;
4898 }
4899
4900 /* Else insert an UPTO if the max is greater than the min, again
4901 preceded by the character, for the previously inserted code. If the
4902 UPTO is just for 1 instance, we can use QUERY instead. */
4903
4904 else if (repeat_max != repeat_min)
4905 {
4906 #ifdef SUPPORT_UTF
4907 if (utf && (c & UTF_LENGTH) != 0)
4908 {
4909 memcpy(code, utf_chars, IN_UCHARS(c & 7));
4910 code += c & 7;
4911 }
4912 else
4913 #endif
4914 *code++ = c;
4915 if (prop_type >= 0)
4916 {
4917 *code++ = prop_type;
4918 *code++ = prop_value;
4919 }
4920 repeat_max -= repeat_min;
4921
4922 if (repeat_max == 1)
4923 {
4924 *code++ = OP_QUERY + repeat_type;
4925 }
4926 else
4927 {
4928 *code++ = OP_UPTO + repeat_type;
4929 PUT2INC(code, 0, repeat_max);
4930 }
4931 }
4932 }
4933
4934 /* The character or character type itself comes last in all cases. */
4935
4936 #ifdef SUPPORT_UTF
4937 if (utf && (c & UTF_LENGTH) != 0)
4938 {
4939 memcpy(code, utf_chars, IN_UCHARS(c & 7));
4940 code += c & 7;
4941 }
4942 else
4943 #endif
4944 *code++ = c;
4945
4946 /* For a repeated Unicode property match, there are two extra bytes that
4947 define the required property. */
4948
4949 #ifdef SUPPORT_UCP
4950 if (prop_type >= 0)
4951 {
4952 *code++ = prop_type;
4953 *code++ = prop_value;
4954 }
4955 #endif
4956 }
4957
4958 /* If previous was a character class or a back reference, we put the repeat
4959 stuff after it, but just skip the item if the repeat was {0,0}. */
4960
4961 else if (*previous == OP_CLASS ||
4962 *previous == OP_NCLASS ||
4963 #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
4964 *previous == OP_XCLASS ||
4965 #endif
4966 *previous == OP_REF ||
4967 *previous == OP_REFI)
4968 {
4969 if (repeat_max == 0)
4970 {
4971 code = previous;
4972 goto END_REPEAT;
4973 }
4974
4975 /*--------------------------------------------------------------------*/
4976 /* This code is obsolete from release 8.00; the restriction was finally
4977 removed: */
4978
4979 /* All real repeats make it impossible to handle partial matching (maybe
4980 one day we will be able to remove this restriction). */
4981
4982 /* if (repeat_max != 1) cd->external_flags |= PCRE_NOPARTIAL; */
4983 /*--------------------------------------------------------------------*/
4984
4985 if (repeat_min == 0 && repeat_max == -1)
4986 *code++ = OP_CRSTAR + repeat_type;
4987 else if (repeat_min == 1 && repeat_max == -1)
4988 *code++ = OP_CRPLUS + repeat_type;
4989 else if (repeat_min == 0 && repeat_max == 1)
4990 *code++ = OP_CRQUERY + repeat_type;
4991 else
4992 {
4993 *code++ = OP_CRRANGE + repeat_type;
4994 PUT2INC(code, 0, repeat_min);
4995 if (repeat_max == -1) repeat_max = 0; /* 2-byte encoding for max */
4996 PUT2INC(code, 0, repeat_max);
4997 }
4998 }
4999
5000 /* If previous was a bracket group, we may have to replicate it in certain
5001 cases. Note that at this point we can encounter only the "basic" bracket
5002 opcodes such as BRA and CBRA, as this is the place where they get converted
5003 into the more special varieties such as BRAPOS and SBRA. A test for >=
5004 OP_ASSERT and <= OP_COND includes ASSERT, ASSERT_NOT, ASSERTBACK,
5005 ASSERTBACK_NOT, ONCE, BRA, CBRA, and COND. Originally, PCRE did not allow
5006 repetition of assertions, but now it does, for Perl compatibility. */
5007
5008 else if (*previous >= OP_ASSERT && *previous <= OP_COND)
5009 {
5010 register int i;
5011 int len = (int)(code - previous);
5012 pcre_uchar *bralink = NULL;
5013 pcre_uchar *brazeroptr = NULL;
5014
5015 /* Repeating a DEFINE group is pointless, but Perl allows the syntax, so
5016 we just ignore the repeat. */
5017
5018 if (*previous == OP_COND && previous[LINK_SIZE+1] == OP_DEF)
5019 goto END_REPEAT;
5020
5021 /* There is no sense in actually repeating assertions. The only potential
5022 use of repetition is in cases when the assertion is optional. Therefore,
5023 if the minimum is greater than zero, just ignore the repeat. If the
5024 maximum is not not zero or one, set it to 1. */
5025
5026 if (*previous < OP_ONCE) /* Assertion */
5027 {
5028 if (repeat_min > 0) goto END_REPEAT;
5029 if (repeat_max < 0 || repeat_max > 1) repeat_max = 1;
5030 }
5031
5032 /* The case of a zero minimum is special because of the need to stick
5033 OP_BRAZERO in front of it, and because the group appears once in the
5034 data, whereas in other cases it appears the minimum number of times. For
5035 this reason, it is simplest to treat this case separately, as otherwise
5036 the code gets far too messy. There are several special subcases when the
5037 minimum is zero. */
5038
5039 if (repeat_min == 0)
5040 {
5041 /* If the maximum is also zero, we used to just omit the group from the
5042 output altogether, like this:
5043
5044 ** if (repeat_max == 0)
5045 ** {
5046 ** code = previous;
5047 ** goto END_REPEAT;
5048 ** }
5049
5050 However, that fails when a group or a subgroup within it is referenced
5051 as a subroutine from elsewhere in the pattern, so now we stick in
5052 OP_SKIPZERO in front of it so that it is skipped on execution. As we
5053 don't have a list of which groups are referenced, we cannot do this
5054 selectively.
5055
5056 If the maximum is 1 or unlimited, we just have to stick in the BRAZERO
5057 and do no more at this point. However, we do need to adjust any
5058 OP_RECURSE calls inside the group that refer to the group itself or any
5059 internal or forward referenced group, because the offset is from the
5060 start of the whole regex. Temporarily terminate the pattern while doing
5061 this. */
5062
5063 if (repeat_max <= 1) /* Covers 0, 1, and unlimited */
5064 {
5065 *code = OP_END;
5066 adjust_recurse(previous, 1, utf, cd, save_hwm);
5067 memmove(previous + 1, previous, IN_UCHARS(len));
5068 code++;
5069 if (repeat_max == 0)
5070 {
5071 *previous++ = OP_SKIPZERO;
5072 goto END_REPEAT;
5073 }
5074 brazeroptr = previous; /* Save for possessive optimizing */
5075 *previous++ = OP_BRAZERO + repeat_type;
5076 }
5077
5078 /* If the maximum is greater than 1 and limited, we have to replicate
5079 in a nested fashion, sticking OP_BRAZERO before each set of brackets.
5080 The first one has to be handled carefully because it's the original
5081 copy, which has to be moved up. The remainder can be handled by code
5082 that is common with the non-zero minimum case below. We have to
5083 adjust the value or repeat_max, since one less copy is required. Once
5084 again, we may have to adjust any OP_RECURSE calls inside the group. */
5085
5086 else
5087 {
5088 int offset;
5089 *code = OP_END;
5090 adjust_recurse(previous, 2 + LINK_SIZE, utf, cd, save_hwm);
5091 memmove(previous + 2 + LINK_SIZE, previous, IN_UCHARS(len));
5092 code += 2 + LINK_SIZE;
5093 *previous++ = OP_BRAZERO + repeat_type;
5094 *previous++ = OP_BRA;
5095
5096 /* We chain together the bracket offset fields that have to be
5097 filled in later when the ends of the brackets are reached. */
5098
5099 offset = (bralink == NULL)? 0 : (int)(previous - bralink);
5100 bralink = previous;
5101 PUTINC(previous, 0, offset);
5102 }
5103
5104 repeat_max--;
5105 }
5106
5107 /* If the minimum is greater than zero, replicate the group as many
5108 times as necessary, and adjust the maximum to the number of subsequent
5109 copies that we need. If we set a first char from the group, and didn't
5110 set a required char, copy the latter from the former. If there are any
5111 forward reference subroutine calls in the group, there will be entries on
5112 the workspace list; replicate these with an appropriate increment. */
5113
5114 else
5115 {
5116 if (repeat_min > 1)
5117 {
5118 /* In the pre-compile phase, we don't actually do the replication. We
5119 just adjust the length as if we had. Do some paranoid checks for
5120 potential integer overflow. The INT64_OR_DOUBLE type is a 64-bit
5121 integer type when available, otherwise double. */
5122
5123 if (lengthptr != NULL)
5124 {
5125 int delta = (repeat_min - 1)*length_prevgroup;
5126 if ((INT64_OR_DOUBLE)(repeat_min - 1)*
5127 (INT64_OR_DOUBLE)length_prevgroup >
5128 (INT64_OR_DOUBLE)INT_MAX ||
5129 OFLOW_MAX - *lengthptr < delta)
5130 {
5131 *errorcodeptr = ERR20;
5132 goto FAILED;
5133 }
5134 *lengthptr += delta;
5135 }
5136
5137 /* This is compiling for real. If there is a set first byte for
5138 the group, and we have not yet set a "required byte", set it. Make
5139 sure there is enough workspace for copying forward references before
5140 doing the copy. */
5141
5142 else
5143 {
5144 if (groupsetfirstchar && reqchar < 0) reqchar = firstchar;
5145
5146 for (i = 1; i < repeat_min; i++)
5147 {
5148 pcre_uchar *hc;
5149 pcre_uchar *this_hwm = cd->hwm;
5150 memcpy(code, previous, IN_UCHARS(len));
5151
5152 while (cd->hwm > cd->start_workspace + cd->workspace_size -
5153 WORK_SIZE_SAFETY_MARGIN - (this_hwm - save_hwm))
5154 {
5155 int save_offset = save_hwm - cd->start_workspace;
5156 int this_offset = this_hwm - cd->start_workspace;
5157 *errorcodeptr = expand_workspace(cd);
5158 if (*errorcodeptr != 0) goto FAILED;
5159 save_hwm = (pcre_uchar *)cd->start_workspace + save_offset;
5160 this_hwm = (pcre_uchar *)cd->start_workspace + this_offset;
5161 }
5162
5163 for (hc = save_hwm; hc < this_hwm; hc += LINK_SIZE)
5164 {
5165 PUT(cd->hwm, 0, GET(hc, 0) + len);
5166 cd->hwm += LINK_SIZE;
5167 }
5168 save_hwm = this_hwm;
5169 code += len;
5170 }
5171 }
5172 }
5173
5174 if (repeat_max > 0) repeat_max -= repeat_min;
5175 }
5176
5177 /* This code is common to both the zero and non-zero minimum cases. If
5178 the maximum is limited, it replicates the group in a nested fashion,
5179 remembering the bracket starts on a stack. In the case of a zero minimum,
5180 the first one was set up above. In all cases the repeat_max now specifies
5181 the number of additional copies needed. Again, we must remember to
5182 replicate entries on the forward reference list. */
5183
5184 if (repeat_max >= 0)
5185 {
5186 /* In the pre-compile phase, we don't actually do the replication. We
5187 just adjust the length as if we had. For each repetition we must add 1
5188 to the length for BRAZERO and for all but the last repetition we must
5189 add 2 + 2*LINKSIZE to allow for the nesting that occurs. Do some
5190 paranoid checks to avoid integer overflow. The INT64_OR_DOUBLE type is
5191 a 64-bit integer type when available, otherwise double. */
5192
5193 if (lengthptr != NULL && repeat_max > 0)
5194 {
5195 int delta = repeat_max * (length_prevgroup + 1 + 2 + 2*LINK_SIZE) -
5196 2 - 2*LINK_SIZE; /* Last one doesn't nest */
5197 if ((INT64_OR_DOUBLE)repeat_max *
5198 (INT64_OR_DOUBLE)(length_prevgroup + 1 + 2 + 2*LINK_SIZE)
5199 > (INT64_OR_DOUBLE)INT_MAX ||
5200 OFLOW_MAX - *lengthptr < delta)
5201 {
5202 *errorcodeptr = ERR20;
5203 goto FAILED;
5204 }
5205 *lengthptr += delta;
5206 }
5207
5208 /* This is compiling for real */
5209
5210 else for (i = repeat_max - 1; i >= 0; i--)
5211 {
5212 pcre_uchar *hc;
5213 pcre_uchar *this_hwm = cd->hwm;
5214
5215 *code++ = OP_BRAZERO + repeat_type;
5216
5217 /* All but the final copy start a new nesting, maintaining the
5218 chain of brackets outstanding. */
5219
5220 if (i != 0)
5221 {
5222 int offset;
5223 *code++ = OP_BRA;
5224 offset = (bralink == NULL)? 0 : (int)(code - bralink);
5225 bralink = code;
5226 PUTINC(code, 0, offset);
5227 }
5228
5229 memcpy(code, previous, IN_UCHARS(len));
5230
5231 /* Ensure there is enough workspace for forward references before
5232 copying them. */
5233
5234 while (cd->hwm > cd->start_workspace + cd->workspace_size -
5235 WORK_SIZE_SAFETY_MARGIN - (this_hwm - save_hwm))
5236 {
5237 int save_offset = save_hwm - cd->start_workspace;
5238 int this_offset = this_hwm - cd->start_workspace;
5239 *errorcodeptr = expand_workspace(cd);
5240 if (*errorcodeptr != 0) goto FAILED;
5241 save_hwm = (pcre_uchar *)cd->start_workspace + save_offset;
5242 this_hwm = (pcre_uchar *)cd->start_workspace + this_offset;
5243 }
5244
5245 for (hc = save_hwm; hc < this_hwm; hc += LINK_SIZE)
5246 {
5247 PUT(cd->hwm, 0, GET(hc, 0) + len + ((i != 0)? 2+LINK_SIZE : 1));
5248 cd->hwm += LINK_SIZE;
5249 }
5250 save_hwm = this_hwm;
5251 code += len;
5252 }
5253
5254 /* Now chain through the pending brackets, and fill in their length
5255 fields (which are holding the chain links pro tem). */
5256
5257 while (bralink != NULL)
5258 {
5259 int oldlinkoffset;
5260 int offset = (int)(code - bralink + 1);
5261 pcre_uchar *bra = code - offset;
5262 oldlinkoffset = GET(bra, 1);
5263 bralink = (oldlinkoffset == 0)? NULL : bralink - oldlinkoffset;
5264 *code++ = OP_KET;
5265 PUTINC(code, 0, offset);
5266 PUT(bra, 1, offset);
5267 }
5268 }
5269
5270 /* If the maximum is unlimited, set a repeater in the final copy. For
5271 ONCE brackets, that's all we need to do. However, possessively repeated
5272 ONCE brackets can be converted into non-capturing brackets, as the
5273 behaviour of (?:xx)++ is the same as (?>xx)++ and this saves having to
5274 deal with possessive ONCEs specially.
5275
5276 Otherwise, when we are doing the actual compile phase, check to see
5277 whether this group is one that could match an empty string. If so,
5278 convert the initial operator to the S form (e.g. OP_BRA -> OP_SBRA) so
5279 that runtime checking can be done. [This check is also applied to ONCE
5280 groups at runtime, but in a different way.]
5281
5282 Then, if the quantifier was possessive and the bracket is not a
5283 conditional, we convert the BRA code to the POS form, and the KET code to
5284 KETRPOS. (It turns out to be convenient at runtime to detect this kind of
5285 subpattern at both the start and at the end.) The use of special opcodes
5286 makes it possible to reduce greatly the stack usage in pcre_exec(). If
5287 the group is preceded by OP_BRAZERO, convert this to OP_BRAPOSZERO.
5288
5289 Then, if the minimum number of matches is 1 or 0, cancel the possessive
5290 flag so that the default action below, of wrapping everything inside
5291 atomic brackets, does not happen. When the minimum is greater than 1,
5292 there will be earlier copies of the group, and so we still have to wrap
5293 the whole thing. */
5294
5295 else
5296 {
5297 pcre_uchar *ketcode = code - 1 - LINK_SIZE;
5298 pcre_uchar *bracode = ketcode - GET(ketcode, 1);
5299
5300 /* Convert possessive ONCE brackets to non-capturing */
5301
5302 if ((*bracode == OP_ONCE || *bracode == OP_ONCE_NC) &&
5303 possessive_quantifier) *bracode = OP_BRA;
5304
5305 /* For non-possessive ONCE brackets, all we need to do is to
5306 set the KET. */
5307
5308 if (*bracode == OP_ONCE || *bracode == OP_ONCE_NC)
5309 *ketcode = OP_KETRMAX + repeat_type;
5310
5311 /* Handle non-ONCE brackets and possessive ONCEs (which have been
5312 converted to non-capturing above). */
5313
5314 else
5315 {
5316 /* In the compile phase, check for empty string matching. */
5317
5318 if (lengthptr == NULL)
5319 {
5320 pcre_uchar *scode = bracode;
5321 do
5322 {
5323 if (could_be_empty_branch(scode, ketcode, utf, cd))
5324 {
5325 *bracode += OP_SBRA - OP_BRA;
5326 break;
5327 }
5328 scode += GET(scode, 1);
5329 }
5330 while (*scode == OP_ALT);
5331 }
5332
5333 /* Handle possessive quantifiers. */
5334
5335 if (possessive_quantifier)
5336 {
5337 /* For COND brackets, we wrap the whole thing in a possessively
5338 repeated non-capturing bracket, because we have not invented POS
5339 versions of the COND opcodes. Because we are moving code along, we
5340 must ensure that any pending recursive references are updated. */
5341
5342 if (*bracode == OP_COND || *bracode == OP_SCOND)
5343 {
5344 int nlen = (int)(code - bracode);
5345 *code = OP_END;
5346 adjust_recurse(bracode, 1 + LINK_SIZE, utf, cd, save_hwm);
5347 memmove(bracode + 1 + LINK_SIZE, bracode, IN_UCHARS(nlen));
5348 code += 1 + LINK_SIZE;
5349 nlen += 1 + LINK_SIZE;
5350 *bracode = OP_BRAPOS;
5351 *code++ = OP_KETRPOS;
5352 PUTINC(code, 0, nlen);
5353 PUT(bracode, 1, nlen);
5354 }
5355
5356 /* For non-COND brackets, we modify the BRA code and use KETRPOS. */
5357
5358 else
5359 {
5360 *bracode += 1; /* Switch to xxxPOS opcodes */
5361 *ketcode = OP_KETRPOS;
5362 }
5363
5364 /* If the minimum is zero, mark it as possessive, then unset the
5365 possessive flag when the minimum is 0 or 1. */
5366
5367 if (brazeroptr != NULL) *brazeroptr = OP_BRAPOSZERO;
5368 if (repeat_min < 2) possessive_quantifier = FALSE;
5369 }
5370
5371 /* Non-possessive quantifier */
5372
5373 else *ketcode = OP_KETRMAX + repeat_type;
5374 }
5375 }
5376 }
5377
5378 /* If previous is OP_FAIL, it was generated by an empty class [] in
5379 JavaScript mode. The other ways in which OP_FAIL can be generated, that is
5380 by (*FAIL) or (?!) set previous to NULL, which gives a "nothing to repeat"
5381 error above. We can just ignore the repeat in JS case. */
5382
5383 else if (*previous == OP_FAIL) goto END_REPEAT;
5384
5385 /* Else there's some kind of shambles */
5386
5387 else
5388 {
5389 *errorcodeptr = ERR11;
5390 goto FAILED;
5391 }
5392
5393 /* If the character following a repeat is '+', or if certain optimization
5394 tests above succeeded, possessive_quantifier is TRUE. For some opcodes,
5395 there are special alternative opcodes for this case. For anything else, we
5396 wrap the entire repeated item inside OP_ONCE brackets. Logically, the '+'
5397 notation is just syntactic sugar, taken from Sun's Java package, but the
5398 special opcodes can optimize it.
5399
5400 Some (but not all) possessively repeated subpatterns have already been
5401 completely handled in the code just above. For them, possessive_quantifier
5402 is always FALSE at this stage.
5403
5404 Note that the repeated item starts at tempcode, not at previous, which
5405 might be the first part of a string whose (former) last char we repeated.
5406
5407 Possessifying an 'exact' quantifier has no effect, so we can ignore it. But
5408 an 'upto' may follow. We skip over an 'exact' item, and then test the
5409 length of what remains before proceeding. */
5410
5411 if (possessive_quantifier)
5412 {
5413 int len;
5414
5415 if (*tempcode == OP_TYPEEXACT)
5416 tempcode += PRIV(OP_lengths)[*tempcode] +
5417 ((tempcode[1 + IMM2_SIZE] == OP_PROP
5418 || tempcode[1 + IMM2_SIZE] == OP_NOTPROP)? 2 : 0);
5419
5420 else if (*tempcode == OP_EXACT || *tempcode == OP_NOTEXACT)
5421 {
5422 tempcode += PRIV(OP_lengths)[*tempcode];
5423 #ifdef SUPPORT_UTF
5424 if (utf && HAS_EXTRALEN(tempcode[-1]))
5425 tempcode += GET_EXTRALEN(tempcode[-1]);
5426 #endif
5427 }
5428
5429 len = (int)(code - tempcode);
5430 if (len > 0) switch (*tempcode)
5431 {
5432 case OP_STAR: *tempcode = OP_POSSTAR; break;
5433 case OP_PLUS: *tempcode = OP_POSPLUS; break;
5434 case OP_QUERY: *tempcode = OP_POSQUERY; break;
5435 case OP_UPTO: *tempcode = OP_POSUPTO; break;
5436
5437 case OP_STARI: *tempcode = OP_POSSTARI; break;
5438 case OP_PLUSI: *tempcode = OP_POSPLUSI; break;
5439 case OP_QUERYI: *tempcode = OP_POSQUERYI; break;
5440 case OP_UPTOI: *tempcode = OP_POSUPTOI; break;
5441
5442 case OP_NOTSTAR: *tempcode = OP_NOTPOSSTAR; break;
5443 case OP_NOTPLUS: *tempcode = OP_NOTPOSPLUS; break;
5444 case OP_NOTQUERY: *tempcode = OP_NOTPOSQUERY; break;
5445 case OP_NOTUPTO: *tempcode = OP_NOTPOSUPTO; break;
5446
5447 case OP_NOTSTARI: *tempcode = OP_NOTPOSSTARI; break;
5448 case OP_NOTPLUSI: *tempcode = OP_NOTPOSPLUSI; break;
5449 case OP_NOTQUERYI: *tempcode = OP_NOTPOSQUERYI; break;
5450 case OP_NOTUPTOI: *tempcode = OP_NOTPOSUPTOI; break;
5451
5452 case OP_TYPESTAR: *tempcode = OP_TYPEPOSSTAR; break;
5453 case OP_TYPEPLUS: *tempcode = OP_TYPEPOSPLUS; break;
5454 case OP_TYPEQUERY: *tempcode = OP_TYPEPOSQUERY; break;
5455 case OP_TYPEUPTO: *tempcode = OP_TYPEPOSUPTO; break;
5456
5457 /* Because we are moving code along, we must ensure that any
5458 pending recursive references are updated. */
5459
5460 default:
5461 *code = OP_END;
5462 adjust_recurse(tempcode, 1 + LINK_SIZE, utf, cd, save_hwm);
5463 memmove(tempcode + 1 + LINK_SIZE, tempcode, IN_UCHARS(len));
5464 code += 1 + LINK_SIZE;
5465 len += 1 + LINK_SIZE;
5466 tempcode[0] = OP_ONCE;
5467 *code++ = OP_KET;
5468 PUTINC(code, 0, len);
5469 PUT(tempcode, 1, len);
5470 break;
5471 }
5472 }
5473
5474 /* In all case we no longer have a previous item. We also set the
5475 "follows varying string" flag for subsequently encountered reqchars if
5476 it isn't already set and we have just passed a varying length item. */
5477
5478 END_REPEAT:
5479 previous = NULL;
5480 cd->req_varyopt |= reqvary;
5481 break;
5482
5483
5484 /* ===================================================================*/
5485 /* Start of nested parenthesized sub-expression, or comment or lookahead or
5486 lookbehind or option setting or condition or all the other extended
5487 parenthesis forms. */
5488
5489 case CHAR_LEFT_PARENTHESIS:
5490 newoptions = options;
5491 skipbytes = 0;
5492 bravalue = OP_CBRA;
5493 save_hwm = cd->hwm;
5494 reset_bracount = FALSE;
5495
5496 /* First deal with various "verbs" that can be introduced by '*'. */
5497
5498 ptr++;
5499 if (ptr[0] == CHAR_ASTERISK && (ptr[1] == ':'
5500 || (MAX_255(ptr[1]) && ((cd->ctypes[ptr[1]] & ctype_letter) != 0))))
5501 {
5502 int i, namelen;
5503 int arglen = 0;
5504 const char *vn = verbnames;
5505 const pcre_uchar *name = ptr + 1;
5506 const pcre_uchar *arg = NULL;
5507 previous = NULL;
5508 ptr++;
5509 while (MAX_255(*ptr) && (cd->ctypes[*ptr] & ctype_letter) != 0) ptr++;
5510 namelen = (int)(ptr - name);
5511
5512 /* It appears that Perl allows any characters whatsoever, other than
5513 a closing parenthesis, to appear in arguments, so we no longer insist on
5514 letters, digits, and underscores. */
5515
5516 if (*ptr == CHAR_COLON)
5517 {
5518 arg = ++ptr;
5519 while (*ptr != 0 && *ptr != CHAR_RIGHT_PARENTHESIS) ptr++;
5520 arglen = (int)(ptr - arg);
5521 }
5522
5523 if (*ptr != CHAR_RIGHT_PARENTHESIS)
5524 {
5525 *errorcodeptr = ERR60;
5526 goto FAILED;
5527 }
5528
5529 /* Scan the table of verb names */
5530
5531 for (i = 0; i < verbcount; i++)
5532 {
5533 if (namelen == verbs[i].len &&
5534 STRNCMP_UC_C8(name, vn, namelen) == 0)
5535 {
5536 /* Check for open captures before ACCEPT and convert it to
5537 ASSERT_ACCEPT if in an assertion. */
5538
5539 if (verbs[i].op == OP_ACCEPT)
5540 {
5541 open_capitem *oc;
5542 if (arglen != 0)
5543 {
5544 *errorcodeptr = ERR59;
5545 goto FAILED;
5546 }
5547 cd->had_accept = TRUE;
5548 for (oc = cd->open_caps; oc != NULL; oc = oc->next)
5549 {
5550 *code++ = OP_CLOSE;
5551 PUT2INC(code, 0, oc->number);
5552 }
5553 *code++ = (cd->assert_depth > 0)? OP_ASSERT_ACCEPT : OP_ACCEPT;
5554
5555 /* Do not set firstchar after *ACCEPT */
5556 if (firstchar == REQ_UNSET) firstchar = REQ_NONE;
5557 }
5558
5559 /* Handle other cases with/without an argument */
5560
5561 else if (arglen == 0)
5562 {
5563 if (verbs[i].op < 0) /* Argument is mandatory */
5564 {
5565 *errorcodeptr = ERR66;
5566 goto FAILED;
5567 }
5568 *code = verbs[i].op;
5569 if (*code++ == OP_THEN) cd->external_flags |= PCRE_HASTHEN;
5570 }
5571
5572 else
5573 {
5574 if (verbs[i].op_arg < 0) /* Argument is forbidden */
5575 {
5576 *errorcodeptr = ERR59;
5577 goto FAILED;
5578 }
5579 *code = verbs[i].op_arg;
5580 if (*code++ == OP_THEN_ARG) cd->external_flags |= PCRE_HASTHEN;
5581 *code++ = arglen;
5582 memcpy(code, arg, IN_UCHARS(arglen));
5583 code += arglen;
5584 *code++ = 0;
5585 }
5586
5587 break; /* Found verb, exit loop */
5588 }
5589
5590 vn += verbs[i].len + 1;
5591 }
5592
5593 if (i < verbcount) continue; /* Successfully handled a verb */
5594 *errorcodeptr = ERR60; /* Verb not recognized */
5595 goto FAILED;
5596 }
5597
5598 /* Deal with the extended parentheses; all are introduced by '?', and the
5599 appearance of any of them means that this is not a capturing group. */
5600
5601 else if (*ptr == CHAR_QUESTION_MARK)
5602 {
5603 int i, set, unset, namelen;
5604 int *optset;
5605 const pcre_uchar *name;
5606 pcre_uchar *slot;
5607
5608 switch (*(++ptr))
5609 {
5610 case CHAR_NUMBER_SIGN: /* Comment; skip to ket */
5611 ptr++;
5612 while (*ptr != 0 && *ptr != CHAR_RIGHT_PARENTHESIS) ptr++;
5613 if (*ptr == 0)
5614 {
5615 *errorcodeptr = ERR18;
5616 goto FAILED;
5617 }
5618 continue;
5619
5620
5621 /* ------------------------------------------------------------ */
5622 case CHAR_VERTICAL_LINE: /* Reset capture count for each branch */
5623 reset_bracount = TRUE;
5624 /* Fall through */
5625
5626 /* ------------------------------------------------------------ */
5627 case CHAR_COLON: /* Non-capturing bracket */
5628 bravalue = OP_BRA;
5629 ptr++;
5630 break;
5631
5632
5633 /* ------------------------------------------------------------ */
5634 case CHAR_LEFT_PARENTHESIS:
5635 bravalue = OP_COND; /* Conditional group */
5636
5637 /* A condition can be an assertion, a number (referring to a numbered
5638 group), a name (referring to a named group), or 'R', referring to
5639 recursion. R<digits> and R&name are also permitted for recursion tests.
5640
5641 There are several syntaxes for testing a named group: (?(name)) is used
5642 by Python; Perl 5.10 onwards uses (?(<name>) or (?('name')).
5643
5644 There are two unfortunate ambiguities, caused by history. (a) 'R' can
5645 be the recursive thing or the name 'R' (and similarly for 'R' followed
5646 by digits), and (b) a number could be a name that consists of digits.
5647 In both cases, we look for a name first; if not found, we try the other
5648 cases. */
5649
5650 /* For conditions that are assertions, check the syntax, and then exit
5651 the switch. This will take control down to where bracketed groups,
5652 including assertions, are processed. */
5653
5654 if (ptr[1] == CHAR_QUESTION_MARK && (ptr[2] == CHAR_EQUALS_SIGN ||
5655 ptr[2] == CHAR_EXCLAMATION_MARK || ptr[2] == CHAR_LESS_THAN_SIGN))
5656 break;
5657
5658 /* Most other conditions use OP_CREF (a couple change to OP_RREF
5659 below), and all need to skip 1+IMM2_SIZE bytes at the start of the group. */
5660
5661 code[1+LINK_SIZE] = OP_CREF;
5662 skipbytes = 1+IMM2_SIZE;
5663 refsign = -1;
5664
5665 /* Check for a test for recursion in a named group. */
5666
5667 if (ptr[1] == CHAR_R && ptr[2] == CHAR_AMPERSAND)
5668 {
5669 terminator = -1;
5670 ptr += 2;
5671 code[1+LINK_SIZE] = OP_RREF; /* Change the type of test */
5672 }
5673
5674 /* Check for a test for a named group's having been set, using the Perl
5675 syntax (?(<name>) or (?('name') */
5676
5677 else if (ptr[1] == CHAR_LESS_THAN_SIGN)
5678 {
5679 terminator = CHAR_GREATER_THAN_SIGN;
5680 ptr++;
5681 }
5682 else if (ptr[1] == CHAR_APOSTROPHE)
5683 {
5684 terminator = CHAR_APOSTROPHE;
5685 ptr++;
5686 }
5687 else
5688 {
5689 terminator = 0;
5690 if (ptr[1] == CHAR_MINUS || ptr[1] == CHAR_PLUS) refsign = *(++ptr);
5691 }
5692
5693 /* We now expect to read a name; any thing else is an error */
5694
5695 if (!MAX_255(ptr[1]) || (cd->ctypes[ptr[1]] & ctype_word) == 0)
5696 {
5697 ptr += 1; /* To get the right offset */
5698 *errorcodeptr = ERR28;
5699 goto FAILED;
5700 }
5701
5702 /* Read the name, but also get it as a number if it's all digits */
5703
5704 recno = 0;
5705 name = ++ptr;
5706 while (MAX_255(*ptr) && (cd->ctypes[*ptr] & ctype_word) != 0)
5707 {
5708 if (recno >= 0)
5709 recno = (IS_DIGIT(*ptr))? recno * 10 + *ptr - CHAR_0 : -1;
5710 ptr++;
5711 }
5712 namelen = (int)(ptr - name);
5713
5714 if ((terminator > 0 && *ptr++ != terminator) ||
5715 *ptr++ != CHAR_RIGHT_PARENTHESIS)
5716 {
5717 ptr--; /* Error offset */
5718 *errorcodeptr = ERR26;
5719 goto FAILED;
5720 }
5721
5722 /* Do no further checking in the pre-compile phase. */
5723
5724 if (lengthptr != NULL) break;
5725
5726 /* In the real compile we do the work of looking for the actual
5727 reference. If the string started with "+" or "-" we require the rest to
5728 be digits, in which case recno will be set. */
5729
5730 if (refsign > 0)
5731 {
5732 if (recno <= 0)
5733 {
5734 *errorcodeptr = ERR58;
5735 goto FAILED;
5736 }
5737 recno = (refsign == CHAR_MINUS)?
5738 cd->bracount - recno + 1 : recno +cd->bracount;
5739 if (recno <= 0 || recno > cd->final_bracount)
5740 {
5741 *errorcodeptr = ERR15;
5742 goto FAILED;
5743 }
5744 PUT2(code, 2+LINK_SIZE, recno);
5745 break;
5746 }
5747
5748 /* Otherwise (did not start with "+" or "-"), start by looking for the
5749 name. If we find a name, add one to the opcode to change OP_CREF or
5750 OP_RREF into OP_NCREF or OP_NRREF. These behave exactly the same,
5751 except they record that the reference was originally to a name. The
5752 information is used to check duplicate names. */
5753
5754 slot = cd->name_table;
5755 for (i = 0; i < cd->names_found; i++)
5756 {
5757 if (STRNCMP_UC_UC(name, slot+IMM2_SIZE, namelen) == 0) break;
5758 slot += cd->name_entry_size;
5759 }
5760
5761 /* Found a previous named subpattern */
5762
5763 if (i < cd->names_found)
5764 {
5765 recno = GET2(slot, 0);
5766 PUT2(code, 2+LINK_SIZE, recno);
5767 code[1+LINK_SIZE]++;
5768 }
5769
5770 /* Search the pattern for a forward reference */
5771
5772 else if ((i = find_parens(cd, name, namelen,
5773 (options & PCRE_EXTENDED) != 0, utf)) > 0)
5774 {
5775 PUT2(code, 2+LINK_SIZE, i);
5776 code[1+LINK_SIZE]++;
5777 }
5778
5779 /* If terminator == 0 it means that the name followed directly after
5780 the opening parenthesis [e.g. (?(abc)...] and in this case there are
5781 some further alternatives to try. For the cases where terminator != 0
5782 [things like (?(<name>... or (?('name')... or (?(R&name)... ] we have
5783 now checked all the possibilities, so give an error. */
5784
5785 else if (terminator != 0)
5786 {
5787 *errorcodeptr = ERR15;
5788 goto FAILED;
5789 }
5790
5791 /* Check for (?(R) for recursion. Allow digits after R to specify a
5792 specific group number. */
5793
5794 else if (*name == CHAR_R)
5795 {
5796 recno = 0;
5797 for (i = 1; i < namelen; i++)
5798 {
5799 if (!IS_DIGIT(name[i]))
5800 {
5801 *errorcodeptr = ERR15;
5802 goto FAILED;
5803 }
5804 recno = recno * 10 + name[i] - CHAR_0;
5805 }
5806 if (recno == 0) recno = RREF_ANY;
5807 code[1+LINK_SIZE] = OP_RREF; /* Change test type */
5808 PUT2(code, 2+LINK_SIZE, recno);
5809 }
5810
5811 /* Similarly, check for the (?(DEFINE) "condition", which is always
5812 false. */
5813
5814 else if (namelen == 6 && STRNCMP_UC_C8(name, STRING_DEFINE, 6) == 0)
5815 {
5816 code[1+LINK_SIZE] = OP_DEF;
5817 skipbytes = 1;
5818 }
5819
5820 /* Check for the "name" actually being a subpattern number. We are
5821 in the second pass here, so final_bracount is set. */
5822
5823 else if (recno > 0 && recno <= cd->final_bracount)
5824 {
5825 PUT2(code, 2+LINK_SIZE, recno);
5826 }
5827
5828 /* Either an unidentified subpattern, or a reference to (?(0) */
5829
5830 else
5831 {
5832 *errorcodeptr = (recno == 0)? ERR35: ERR15;
5833 goto FAILED;
5834 }
5835 break;
5836
5837
5838 /* ------------------------------------------------------------ */
5839 case CHAR_EQUALS_SIGN: /* Positive lookahead */
5840 bravalue = OP_ASSERT;
5841 cd->assert_depth += 1;
5842 ptr++;
5843 break;
5844
5845
5846 /* ------------------------------------------------------------ */
5847 case CHAR_EXCLAMATION_MARK: /* Negative lookahead */
5848 ptr++;
5849 if (*ptr == CHAR_RIGHT_PARENTHESIS) /* Optimize (?!) */
5850 {
5851 *code++ = OP_FAIL;
5852 previous = NULL;
5853 continue;
5854 }
5855 bravalue = OP_ASSERT_NOT;
5856 cd->assert_depth += 1;
5857 break;
5858
5859
5860 /* ------------------------------------------------------------ */
5861 case CHAR_LESS_THAN_SIGN: /* Lookbehind or named define */
5862 switch (ptr[1])
5863 {
5864 case CHAR_EQUALS_SIGN: /* Positive lookbehind */
5865 bravalue = OP_ASSERTBACK;
5866 cd->assert_depth += 1;
5867 ptr += 2;
5868 break;
5869
5870 case CHAR_EXCLAMATION_MARK: /* Negative lookbehind */
5871 bravalue = OP_ASSERTBACK_NOT;
5872 cd->assert_depth += 1;
5873 ptr += 2;
5874 break;
5875
5876 default: /* Could be name define, else bad */
5877 if (MAX_255(ptr[1]) && (cd->ctypes[ptr[1]] & ctype_word) != 0)
5878 goto DEFINE_NAME;
5879 ptr++; /* Correct offset for error */
5880 *errorcodeptr = ERR24;
5881 goto FAILED;
5882 }
5883 break;
5884
5885
5886 /* ------------------------------------------------------------ */
5887 case CHAR_GREATER_THAN_SIGN: /* One-time brackets */
5888 bravalue = OP_ONCE;
5889 ptr++;
5890 break;
5891
5892
5893 /* ------------------------------------------------------------ */
5894 case CHAR_C: /* Callout - may be followed by digits; */
5895 previous_callout = code; /* Save for later completion */
5896 after_manual_callout = 1; /* Skip one item before completing */
5897 *code++ = OP_CALLOUT;
5898 {
5899 int n = 0;
5900 ptr++;
5901 while(IS_DIGIT(*ptr))
5902 n = n * 10 + *ptr++ - CHAR_0;
5903 if (*ptr != CHAR_RIGHT_PARENTHESIS)
5904 {
5905 *errorcodeptr = ERR39;
5906 goto FAILED;
5907 }
5908 if (n > 255)
5909 {
5910 *errorcodeptr = ERR38;
5911 goto FAILED;
5912 }
5913 *code++ = n;
5914 PUT(code, 0, (int)(ptr - cd->start_pattern + 1)); /* Pattern offset */
5915 PUT(code, LINK_SIZE, 0); /* Default length */
5916 code += 2 * LINK_SIZE;
5917 }
5918 previous = NULL;
5919 continue;
5920
5921
5922 /* ------------------------------------------------------------ */
5923 case CHAR_P: /* Python-style named subpattern handling */
5924 if (*(++ptr) == CHAR_EQUALS_SIGN ||
5925 *ptr == CHAR_GREATER_THAN_SIGN) /* Reference or recursion */
5926 {
5927 is_recurse = *ptr == CHAR_GREATER_THAN_SIGN;
5928 terminator = CHAR_RIGHT_PARENTHESIS;
5929 goto NAMED_REF_OR_RECURSE;
5930 }
5931 else if (*ptr != CHAR_LESS_THAN_SIGN) /* Test for Python-style defn */
5932 {
5933 *errorcodeptr = ERR41;
5934 goto FAILED;
5935 }
5936 /* Fall through to handle (?P< as (?< is handled */
5937
5938
5939 /* ------------------------------------------------------------ */
5940 DEFINE_NAME: /* Come here from (?< handling */
5941 case CHAR_APOSTROPHE:
5942 {
5943 terminator = (*ptr == CHAR_LESS_THAN_SIGN)?
5944 CHAR_GREATER_THAN_SIGN : CHAR_APOSTROPHE;
5945 name = ++ptr;
5946
5947 while (MAX_255(*ptr) && (cd->ctypes[*ptr] & ctype_word) != 0) ptr++;
5948 namelen = (int)(ptr - name);
5949
5950 /* In the pre-compile phase, just do a syntax check. */
5951
5952 if (lengthptr != NULL)
5953 {
5954 if (*ptr != terminator)
5955 {
5956 *errorcodeptr = ERR42;
5957 goto FAILED;
5958 }
5959 if (cd->names_found >= MAX_NAME_COUNT)
5960 {
5961 *errorcodeptr = ERR49;
5962 goto FAILED;
5963 }
5964 if (namelen + IMM2_SIZE + 1 > cd->name_entry_size)
5965 {
5966 cd->name_entry_size = namelen + IMM2_SIZE + 1;
5967 if (namelen > MAX_NAME_SIZE)
5968 {
5969 *errorcodeptr = ERR48;
5970 goto FAILED;
5971 }
5972 }
5973 }
5974
5975 /* In the real compile, create the entry in the table, maintaining
5976 alphabetical order. Duplicate names for different numbers are
5977 permitted only if PCRE_DUPNAMES is set. Duplicate names for the same
5978 number are always OK. (An existing number can be re-used if (?|
5979 appears in the pattern.) In either event, a duplicate name results in
5980 a duplicate entry in the table, even if the number is the same. This
5981 is because the number of names, and hence the table size, is computed
5982 in the pre-compile, and it affects various numbers and pointers which
5983 would all have to be modified, and the compiled code moved down, if
5984 duplicates with the same number were omitted from the table. This
5985 doesn't seem worth the hassle. However, *different* names for the
5986 same number are not permitted. */
5987
5988 else
5989 {
5990 BOOL dupname = FALSE;
5991 slot = cd->name_table;
5992
5993 for (i = 0; i < cd->names_found; i++)
5994 {
5995 int crc = memcmp(name, slot+IMM2_SIZE, IN_UCHARS(namelen));
5996 if (crc == 0)
5997 {
5998 if (slot[IMM2_SIZE+namelen] == 0)
5999 {
6000 if (GET2(slot, 0) != cd->bracount + 1 &&
6001 (options & PCRE_DUPNAMES) == 0)
6002 {
6003 *errorcodeptr = ERR43;
6004 goto FAILED;
6005 }
6006 else dupname = TRUE;
6007 }
6008 else crc = -1; /* Current name is a substring */
6009 }
6010
6011 /* Make space in the table and break the loop for an earlier
6012 name. For a duplicate or later name, carry on. We do this for
6013 duplicates so that in the simple case (when ?(| is not used) they
6014 are in order of their numbers. */
6015
6016 if (crc < 0)
6017 {
6018 memmove(slot + cd->name_entry_size, slot,
6019 IN_UCHARS((cd->names_found - i) * cd->name_entry_size));
6020 break;
6021 }
6022
6023 /* Continue the loop for a later or duplicate name */
6024
6025 slot += cd->name_entry_size;
6026 }
6027
6028 /* For non-duplicate names, check for a duplicate number before
6029 adding the new name. */
6030
6031 if (!dupname)
6032 {
6033 pcre_uchar *cslot = cd->name_table;
6034 for (i = 0; i < cd->names_found; i++)
6035 {
6036 if (cslot != slot)
6037 {
6038 if (GET2(cslot, 0) == cd->bracount + 1)
6039 {
6040 *errorcodeptr = ERR65;
6041 goto FAILED;
6042 }
6043 }
6044 else i--;
6045 cslot += cd->name_entry_size;
6046 }
6047 }
6048
6049 PUT2(slot, 0, cd->bracount + 1);
6050 memcpy(slot + IMM2_SIZE, name, IN_UCHARS(namelen));
6051 slot[IMM2_SIZE + namelen] = 0;
6052 }
6053 }
6054
6055 /* In both pre-compile and compile, count the number of names we've
6056 encountered. */
6057
6058 cd->names_found++;
6059 ptr++; /* Move past > or ' */
6060 goto NUMBERED_GROUP;
6061
6062
6063 /* ------------------------------------------------------------ */
6064 case CHAR_AMPERSAND: /* Perl recursion/subroutine syntax */
6065 terminator = CHAR_RIGHT_PARENTHESIS;
6066 is_recurse = TRUE;
6067 /* Fall through */
6068
6069 /* We come here from the Python syntax above that handles both
6070 references (?P=name) and recursion (?P>name), as well as falling
6071 through from the Perl recursion syntax (?&name). We also come here from
6072 the Perl \k<name> or \k'name' back reference syntax and the \k{name}
6073 .NET syntax, and the Oniguruma \g<...> and \g'...' subroutine syntax. */
6074
6075 NAMED_REF_OR_RECURSE:
6076 name = ++ptr;
6077 while (MAX_255(*ptr) && (cd->ctypes[*ptr] & ctype_word) != 0) ptr++;
6078 namelen = (int)(ptr - name);
6079
6080 /* In the pre-compile phase, do a syntax check. We used to just set
6081 a dummy reference number, because it was not used in the first pass.
6082 However, with the change of recursive back references to be atomic,
6083 we have to look for the number so that this state can be identified, as
6084 otherwise the incorrect length is computed. If it's not a backwards
6085 reference, the dummy number will do. */
6086
6087 if (lengthptr != NULL)
6088 {
6089 const pcre_uchar *temp;
6090
6091 if (namelen == 0)
6092 {
6093 *errorcodeptr = ERR62;
6094 goto FAILED;
6095 }
6096 if (*ptr != terminator)
6097 {
6098 *errorcodeptr = ERR42;
6099 goto FAILED;
6100 }
6101 if (namelen > MAX_NAME_SIZE)
6102 {
6103 *errorcodeptr = ERR48;
6104 goto FAILED;
6105 }
6106
6107 /* The name table does not exist in the first pass, so we cannot
6108 do a simple search as in the code below. Instead, we have to scan the
6109 pattern to find the number. It is important that we scan it only as
6110 far as we have got because the syntax of named subpatterns has not
6111 been checked for the rest of the pattern, and find_parens() assumes
6112 correct syntax. In any case, it's a waste of resources to scan
6113 further. We stop the scan at the current point by temporarily
6114 adjusting the value of cd->endpattern. */
6115
6116 temp = cd->end_pattern;
6117 cd->end_pattern = ptr;
6118 recno = find_parens(cd, name, namelen,
6119 (options & PCRE_EXTENDED) != 0, utf);
6120 cd->end_pattern = temp;
6121 if (recno < 0) recno = 0; /* Forward ref; set dummy number */
6122 }
6123
6124 /* In the real compile, seek the name in the table. We check the name
6125 first, and then check that we have reached the end of the name in the
6126 table. That way, if the name that is longer than any in the table,
6127 the comparison will fail without reading beyond the table entry. */
6128
6129 else
6130 {
6131 slot = cd->name_table;
6132 for (i = 0; i < cd->names_found; i++)
6133 {
6134 if (STRNCMP_UC_UC(name, slot+IMM2_SIZE, namelen) == 0 &&
6135 slot[IMM2_SIZE+namelen] == 0)
6136 break;
6137 slot += cd->name_entry_size;
6138 }
6139
6140 if (i < cd->names_found) /* Back reference */
6141 {
6142 recno = GET2(slot, 0);
6143 }
6144 else if ((recno = /* Forward back reference */
6145 find_parens(cd, name, namelen,
6146 (options & PCRE_EXTENDED) != 0, utf)) <= 0)
6147 {
6148 *errorcodeptr = ERR15;
6149 goto FAILED;
6150 }
6151 }
6152
6153 /* In both phases, we can now go to the code than handles numerical
6154 recursion or backreferences. */
6155
6156 if (is_recurse) goto HANDLE_RECURSION;
6157 else goto HANDLE_REFERENCE;
6158
6159
6160 /* ------------------------------------------------------------ */
6161 case CHAR_R: /* Recursion */
6162 ptr++; /* Same as (?0) */
6163 /* Fall through */
6164
6165
6166 /* ------------------------------------------------------------ */
6167 case CHAR_MINUS: case CHAR_PLUS: /* Recursion or subroutine */
6168 case CHAR_0: case CHAR_1: case CHAR_2: case CHAR_3: case CHAR_4:
6169 case CHAR_5: case CHAR_6: case CHAR_7: case CHAR_8: case CHAR_9:
6170 {
6171 const pcre_uchar *called;
6172 terminator = CHAR_RIGHT_PARENTHESIS;
6173
6174 /* Come here from the \g<...> and \g'...' code (Oniguruma
6175 compatibility). However, the syntax has been checked to ensure that
6176 the ... are a (signed) number, so that neither ERR63 nor ERR29 will
6177 be called on this path, nor with the jump to OTHER_CHAR_AFTER_QUERY
6178 ever be taken. */
6179
6180 HANDLE_NUMERICAL_RECURSION:
6181
6182 if ((refsign = *ptr) == CHAR_PLUS)
6183 {
6184 ptr++;
6185 if (!IS_DIGIT(*ptr))
6186 {
6187 *errorcodeptr = ERR63;
6188 goto FAILED;
6189 }
6190 }
6191 else if (refsign == CHAR_MINUS)
6192 {
6193 if (!IS_DIGIT(ptr[1]))
6194 goto OTHER_CHAR_AFTER_QUERY;
6195 ptr++;
6196 }
6197
6198 recno = 0;
6199 while(IS_DIGIT(*ptr))
6200 recno = recno * 10 + *ptr++ - CHAR_0;
6201
6202 if (*ptr != terminator)
6203 {
6204 *errorcodeptr = ERR29;
6205 goto FAILED;
6206 }
6207
6208 if (refsign == CHAR_MINUS)
6209 {
6210 if (recno == 0)
6211 {
6212 *errorcodeptr = ERR58;
6213 goto FAILED;
6214 }
6215 recno = cd->bracount - recno + 1;
6216 if (recno <= 0)
6217 {
6218 *errorcodeptr = ERR15;
6219 goto FAILED;
6220 }
6221 }
6222 else if (refsign == CHAR_PLUS)
6223 {
6224 if (recno == 0)
6225 {
6226 *errorcodeptr = ERR58;
6227 goto FAILED;
6228 }
6229 recno += cd->bracount;
6230 }
6231
6232 /* Come here from code above that handles a named recursion */
6233
6234 HANDLE_RECURSION:
6235
6236 previous = code;
6237 called = cd->start_code;
6238
6239 /* When we are actually compiling, find the bracket that is being
6240 referenced. Temporarily end the regex in case it doesn't exist before
6241 this point. If we end up with a forward reference, first check that
6242 the bracket does occur later so we can give the error (and position)
6243 now. Then remember this forward reference in the workspace so it can
6244 be filled in at the end. */
6245
6246 if (lengthptr == NULL)
6247 {
6248 *code = OP_END;
6249 if (recno != 0)
6250 called = PRIV(find_bracket)(cd->start_code, utf, recno);
6251
6252 /* Forward reference */
6253
6254 if (called == NULL)
6255 {
6256 if (find_parens(cd, NULL, recno,
6257 (options & PCRE_EXTENDED) != 0, utf) < 0)
6258 {
6259 *errorcodeptr = ERR15;
6260 goto FAILED;
6261 }
6262
6263 /* Fudge the value of "called" so that when it is inserted as an
6264 offset below, what it actually inserted is the reference number
6265 of the group. Then remember the forward reference. */
6266
6267 called = cd->start_code + recno;
6268 if (cd->hwm >= cd->start_workspace + cd->workspace_size -
6269 WORK_SIZE_SAFETY_MARGIN)
6270 {
6271 *errorcodeptr = expand_workspace(cd);
6272 if (*errorcodeptr != 0) goto FAILED;
6273 }
6274 PUTINC(cd->hwm, 0, (int)(code + 1 - cd->start_code));
6275 }
6276
6277 /* If not a forward reference, and the subpattern is still open,
6278 this is a recursive call. We check to see if this is a left
6279 recursion that could loop for ever, and diagnose that case. We
6280 must not, however, do this check if we are in a conditional
6281 subpattern because the condition might be testing for recursion in
6282 a pattern such as /(?(R)a+|(?R)b)/, which is perfectly valid.
6283 Forever loops are also detected at runtime, so those that occur in
6284 conditional subpatterns will be picked up then. */
6285
6286 else if (GET(called, 1) == 0 && cond_depth <= 0 &&
6287 could_be_empty(called, code, bcptr, utf, cd))
6288 {
6289 *errorcodeptr = ERR40;
6290 goto FAILED;
6291 }
6292 }
6293
6294 /* Insert the recursion/subroutine item. It does not have a set first
6295 character (relevant if it is repeated, because it will then be
6296 wrapped with ONCE brackets). */
6297
6298 *code = OP_RECURSE;
6299 PUT(code, 1, (int)(called - cd->start_code));
6300 code += 1 + LINK_SIZE;
6301 groupsetfirstchar = FALSE;
6302 }
6303
6304 /* Can't determine a first byte now */
6305
6306 if (firstchar == REQ_UNSET) firstchar = REQ_NONE;
6307 continue;
6308
6309
6310 /* ------------------------------------------------------------ */
6311 default: /* Other characters: check option setting */
6312 OTHER_CHAR_AFTER_QUERY:
6313 set = unset = 0;
6314 optset = &set;
6315
6316 while (*ptr != CHAR_RIGHT_PARENTHESIS && *ptr != CHAR_COLON)
6317 {
6318 switch (*ptr++)
6319 {
6320 case CHAR_MINUS: optset = &unset; break;
6321
6322 case CHAR_J: /* Record that it changed in the external options */
6323 *optset |= PCRE_DUPNAMES;
6324 cd->external_flags |= PCRE_JCHANGED;
6325 break;
6326
6327 case CHAR_i: *optset |= PCRE_CASELESS; break;
6328 case CHAR_m: *optset |= PCRE_MULTILINE; break;
6329 case CHAR_s: *optset |= PCRE_DOTALL; break;
6330 case CHAR_x: *optset |= PCRE_EXTENDED; break;
6331 case CHAR_U: *optset |= PCRE_UNGREEDY; break;
6332 case CHAR_X: *optset |= PCRE_EXTRA; break;
6333
6334 default: *errorcodeptr = ERR12;
6335 ptr--; /* Correct the offset */
6336 goto FAILED;
6337 }
6338 }
6339
6340 /* Set up the changed option bits, but don't change anything yet. */
6341
6342 newoptions = (options | set) & (~unset);
6343
6344 /* If the options ended with ')' this is not the start of a nested
6345 group with option changes, so the options change at this level. If this
6346 item is right at the start of the pattern, the options can be
6347 abstracted and made external in the pre-compile phase, and ignored in
6348 the compile phase. This can be helpful when matching -- for instance in
6349 caseless checking of required bytes.
6350
6351 If the code pointer is not (cd->start_code + 1 + LINK_SIZE), we are
6352 definitely *not* at the start of the pattern because something has been
6353 compiled. In the pre-compile phase, however, the code pointer can have
6354 that value after the start, because it gets reset as code is discarded
6355 during the pre-compile. However, this can happen only at top level - if
6356 we are within parentheses, the starting BRA will still be present. At
6357 any parenthesis level, the length value can be used to test if anything
6358 has been compiled at that level. Thus, a test for both these conditions
6359 is necessary to ensure we correctly detect the start of the pattern in
6360 both phases.
6361
6362 If we are not at the pattern start, reset the greedy defaults and the
6363 case value for firstchar and reqchar. */
6364
6365 if (*ptr == CHAR_RIGHT_PARENTHESIS)
6366 {
6367 if (code == cd->start_code + 1 + LINK_SIZE &&
6368 (lengthptr == NULL || *lengthptr == 2 + 2*LINK_SIZE))
6369 {
6370 cd->external_options = newoptions;
6371 }
6372 else
6373 {
6374 greedy_default = ((newoptions & PCRE_UNGREEDY) != 0);
6375 greedy_non_default = greedy_default ^ 1;
6376 req_caseopt = ((newoptions & PCRE_CASELESS) != 0)? REQ_CASELESS:0;
6377 }
6378
6379 /* Change options at this level, and pass them back for use
6380 in subsequent branches. */
6381
6382 *optionsptr = options = newoptions;
6383 previous = NULL; /* This item can't be repeated */
6384 continue; /* It is complete */
6385 }
6386
6387 /* If the options ended with ':' we are heading into a nested group
6388 with possible change of options. Such groups are non-capturing and are
6389 not assertions of any kind. All we need to do is skip over the ':';
6390 the newoptions value is handled below. */
6391
6392 bravalue = OP_BRA;
6393 ptr++;
6394 } /* End of switch for character following (? */
6395 } /* End of (? handling */
6396
6397 /* Opening parenthesis not followed by '*' or '?'. If PCRE_NO_AUTO_CAPTURE
6398 is set, all unadorned brackets become non-capturing and behave like (?:...)
6399 brackets. */
6400
6401 else if ((options & PCRE_NO_AUTO_CAPTURE) != 0)
6402 {
6403 bravalue = OP_BRA;
6404 }
6405
6406 /* Else we have a capturing group. */
6407
6408 else
6409 {
6410 NUMBERED_GROUP:
6411 cd->bracount += 1;
6412 PUT2(code, 1+LINK_SIZE, cd->bracount);
6413 skipbytes = IMM2_SIZE;
6414 }
6415
6416 /* Process nested bracketed regex. Assertions used not to be repeatable,
6417 but this was changed for Perl compatibility, so all kinds can now be
6418 repeated. We copy code into a non-register variable (tempcode) in order to
6419 be able to pass its address because some compilers complain otherwise. */
6420
6421 previous = code; /* For handling repetition */
6422 *code = bravalue;
6423 tempcode = code;
6424 tempreqvary = cd->req_varyopt; /* Save value before bracket */
6425 tempbracount = cd->bracount; /* Save value before bracket */
6426 length_prevgroup = 0; /* Initialize for pre-compile phase */
6427
6428 if (!compile_regex(
6429 newoptions, /* The complete new option state */
6430 &tempcode, /* Where to put code (updated) */
6431 &ptr, /* Input pointer (updated) */
6432 errorcodeptr, /* Where to put an error message */
6433 (bravalue == OP_ASSERTBACK ||
6434 bravalue == OP_ASSERTBACK_NOT), /* TRUE if back assert */
6435 reset_bracount, /* True if (?| group */
6436 skipbytes, /* Skip over bracket number */
6437 cond_depth +
6438 ((bravalue == OP_COND)?1:0), /* Depth of condition subpatterns */
6439 &subfirstchar, /* For possible first char */
6440 &subreqchar, /* For possible last char */
6441 bcptr, /* Current branch chain */
6442 cd, /* Tables block */
6443 (lengthptr == NULL)? NULL : /* Actual compile phase */
6444 &length_prevgroup /* Pre-compile phase */
6445 ))
6446 goto FAILED;
6447
6448 /* If this was an atomic group and there are no capturing groups within it,
6449 generate OP_ONCE_NC instead of OP_ONCE. */
6450
6451 if (bravalue == OP_ONCE && cd->bracount <= tempbracount)
6452 *code = OP_ONCE_NC;
6453
6454 if (bravalue >= OP_ASSERT && bravalue <= OP_ASSERTBACK_NOT)
6455 cd->assert_depth -= 1;
6456
6457 /* At the end of compiling, code is still pointing to the start of the
6458 group, while tempcode has been updated to point past the end of the group.
6459 The pattern pointer (ptr) is on the bracket.
6460
6461 If this is a conditional bracket, check that there are no more than
6462 two branches in the group, or just one if it's a DEFINE group. We do this
6463 in the real compile phase, not in the pre-pass, where the whole group may
6464 not be available. */
6465
6466 if (bravalue == OP_COND && lengthptr == NULL)
6467 {
6468 pcre_uchar *tc = code;
6469 int condcount = 0;
6470
6471 do {
6472 condcount++;
6473 tc += GET(tc,1);
6474 }
6475 while (*tc != OP_KET);
6476
6477 /* A DEFINE group is never obeyed inline (the "condition" is always
6478 false). It must have only one branch. */
6479
6480 if (code[LINK_SIZE+1] == OP_DEF)
6481 {
6482 if (condcount > 1)
6483 {
6484 *errorcodeptr = ERR54;
6485 goto FAILED;
6486 }
6487 bravalue = OP_DEF; /* Just a flag to suppress char handling below */
6488 }
6489
6490 /* A "normal" conditional group. If there is just one branch, we must not
6491 make use of its firstchar or reqchar, because this is equivalent to an
6492 empty second branch. */
6493
6494 else
6495 {
6496 if (condcount > 2)
6497 {
6498 *errorcodeptr = ERR27;
6499 goto FAILED;
6500 }
6501 if (condcount == 1) subfirstchar = subreqchar = REQ_NONE;
6502 }
6503 }
6504
6505 /* Error if hit end of pattern */
6506
6507 if (*ptr != CHAR_RIGHT_PARENTHESIS)
6508 {
6509 *errorcodeptr = ERR14;
6510 goto FAILED;
6511 }
6512
6513 /* In the pre-compile phase, update the length by the length of the group,
6514 less the brackets at either end. Then reduce the compiled code to just a
6515 set of non-capturing brackets so that it doesn't use much memory if it is
6516 duplicated by a quantifier.*/
6517
6518 if (lengthptr != NULL)
6519 {
6520 if (OFLOW_MAX - *lengthptr < length_prevgroup - 2 - 2*LINK_SIZE)
6521 {
6522 *errorcodeptr = ERR20;
6523 goto FAILED;
6524 }
6525 *lengthptr += length_prevgroup - 2 - 2*LINK_SIZE;
6526 code++; /* This already contains bravalue */
6527 PUTINC(code, 0, 1 + LINK_SIZE);
6528 *code++ = OP_KET;
6529 PUTINC(code, 0, 1 + LINK_SIZE);
6530 break; /* No need to waste time with special character handling */
6531 }
6532
6533 /* Otherwise update the main code pointer to the end of the group. */
6534
6535 code = tempcode;
6536
6537 /* For a DEFINE group, required and first character settings are not
6538 relevant. */
6539
6540 if (bravalue == OP_DEF) break;
6541
6542 /* Handle updating of the required and first characters for other types of
6543 group. Update for normal brackets of all kinds, and conditions with two
6544 branches (see code above). If the bracket is followed by a quantifier with
6545 zero repeat, we have to back off. Hence the definition of zeroreqchar and
6546 zerofirstchar outside the main loop so that they can be accessed for the
6547 back off. */
6548
6549 zeroreqchar = reqchar;
6550 zerofirstchar = firstchar;
6551 groupsetfirstchar = FALSE;
6552
6553 if (bravalue >= OP_ONCE)
6554 {
6555 /* If we have not yet set a firstchar in this branch, take it from the
6556 subpattern, remembering that it was set here so that a repeat of more
6557 than one can replicate it as reqchar if necessary. If the subpattern has
6558 no firstchar, set "none" for the whole branch. In both cases, a zero
6559 repeat forces firstchar to "none". */
6560
6561 if (firstchar == REQ_UNSET)
6562 {
6563 if (subfirstchar >= 0)
6564 {
6565 firstchar = subfirstchar;
6566 groupsetfirstchar = TRUE;
6567 }
6568 else firstchar = REQ_NONE;
6569 zerofirstchar = REQ_NONE;
6570 }
6571
6572 /* If firstchar was previously set, convert the subpattern's firstchar
6573 into reqchar if there wasn't one, using the vary flag that was in
6574 existence beforehand. */
6575
6576 else if (subfirstchar >= 0 && subreqchar < 0)
6577 subreqchar = subfirstchar | tempreqvary;
6578
6579 /* If the subpattern set a required byte (or set a first byte that isn't
6580 really the first byte - see above), set it. */
6581
6582 if (subreqchar >= 0) reqchar = subreqchar;
6583 }
6584
6585 /* For a forward assertion, we take the reqchar, if set. This can be
6586 helpful if the pattern that follows the assertion doesn't set a different
6587 char. For example, it's useful for /(?=abcde).+/. We can't set firstchar
6588 for an assertion, however because it leads to incorrect effect for patterns
6589 such as /(?=a)a.+/ when the "real" "a" would then become a reqchar instead
6590 of a firstchar. This is overcome by a scan at the end if there's no
6591 firstchar, looking for an asserted first char. */
6592
6593 else if (bravalue == OP_ASSERT && subreqchar >= 0) reqchar = subreqchar;
6594 break; /* End of processing '(' */
6595
6596
6597 /* ===================================================================*/
6598 /* Handle metasequences introduced by \. For ones like \d, the ESC_ values
6599 are arranged to be the negation of the corresponding OP_values in the
6600 default case when PCRE_UCP is not set. For the back references, the values
6601 are ESC_REF plus the reference number. Only back references and those types
6602 that consume a character may be repeated. We can test for values between
6603 ESC_b and ESC_Z for the latter; this may have to change if any new ones are
6604 ever created. */
6605
6606 case CHAR_BACKSLASH:
6607 tempptr = ptr;
6608 c = check_escape(&ptr, errorcodeptr, cd->bracount, options, FALSE);
6609 if (*errorcodeptr != 0) goto FAILED;
6610
6611 if (c < 0)
6612 {
6613 if (-c == ESC_Q) /* Handle start of quoted string */
6614 {
6615 if (ptr[1] == CHAR_BACKSLASH && ptr[2] == CHAR_E)
6616 ptr += 2; /* avoid empty string */
6617 else inescq = TRUE;
6618 continue;
6619 }
6620
6621 if (-c == ESC_E) continue; /* Perl ignores an orphan \E */
6622
6623 /* For metasequences that actually match a character, we disable the
6624 setting of a first character if it hasn't already been set. */
6625
6626 if (firstchar == REQ_UNSET && -c > ESC_b && -c < ESC_Z)
6627 firstchar = REQ_NONE;
6628
6629 /* Set values to reset to if this is followed by a zero repeat. */
6630
6631 zerofirstchar = firstchar;
6632 zeroreqchar = reqchar;