/[pcre]/code/tags/pcre-4.5/internal.h
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revision 43 by nigel, Sat Feb 24 21:39:21 2007 UTC revision 69 by nigel, Sat Feb 24 21:40:18 2007 UTC
# Line 9  the file Tech.Notes for some information Line 9  the file Tech.Notes for some information
9    
10  Written by: Philip Hazel <ph10@cam.ac.uk>  Written by: Philip Hazel <ph10@cam.ac.uk>
11    
12             Copyright (c) 1997-2000 University of Cambridge             Copyright (c) 1997-2003 University of Cambridge
13    
14  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
15  Permission is granted to anyone to use this software for any purpose on any  Permission is granted to anyone to use this software for any purpose on any
# Line 39  modules, but which are not relevant to t Line 39  modules, but which are not relevant to t
39    
40  #include "config.h"  #include "config.h"
41    
42    /* When compiling for use with the Virtual Pascal compiler, these functions
43    need to have their names changed. PCRE must be compiled with the -DVPCOMPAT
44    option on the command line. */
45    
46    #ifdef VPCOMPAT
47    #define strncmp(s1,s2,m) _strncmp(s1,s2,m)
48    #define memcpy(d,s,n)    _memcpy(d,s,n)
49    #define memmove(d,s,n)   _memmove(d,s,n)
50    #define memset(s,c,n)    _memset(s,c,n)
51    #else  /* VPCOMPAT */
52    
53  /* To cope with SunOS4 and other systems that lack memmove() but have bcopy(),  /* To cope with SunOS4 and other systems that lack memmove() but have bcopy(),
54  define a macro for memmove() if HAVE_MEMMOVE is false. */  define a macro for memmove() if HAVE_MEMMOVE is false, provided that HAVE_BCOPY
55    is set. Otherwise, include an emulating function for those systems that have
56    neither (there some non-Unix environments where this is the case). This assumes
57    that all calls to memmove are moving strings upwards in store, which is the
58    case in PCRE. */
59    
60  #if ! HAVE_MEMMOVE  #if ! HAVE_MEMMOVE
61  #undef  memmove        /* some systems may have a macro */  #undef  memmove        /* some systems may have a macro */
62    #if HAVE_BCOPY
63  #define memmove(a, b, c) bcopy(b, a, c)  #define memmove(a, b, c) bcopy(b, a, c)
64    #else  /* HAVE_BCOPY */
65    void *
66    pcre_memmove(unsigned char *dest, const unsigned char *src, size_t n)
67    {
68    int i;
69    dest += n;
70    src += n;
71    for (i = 0; i < n; ++i) *(--dest) =  *(--src);
72    }
73    #define memmove(a, b, c) pcre_memmove(a, b, c)
74    #endif   /* not HAVE_BCOPY */
75    #endif   /* not HAVE_MEMMOVE */
76    #endif   /* not VPCOMPAT */
77    
78    
79    /* PCRE keeps offsets in its compiled code as 2-byte quantities by default.
80    These are used, for example, to link from the start of a subpattern to its
81    alternatives and its end. The use of 2 bytes per offset limits the size of the
82    compiled regex to around 64K, which is big enough for almost everybody.
83    However, I received a request for an even bigger limit. For this reason, and
84    also to make the code easier to maintain, the storing and loading of offsets
85    from the byte string is now handled by the macros that are defined here.
86    
87    The macros are controlled by the value of LINK_SIZE. This defaults to 2 in
88    the config.h file, but can be overridden by using -D on the command line. This
89    is automated on Unix systems via the "configure" command. */
90    
91    #if LINK_SIZE == 2
92    
93    #define PUT(a,n,d)   \
94      (a[n] = (d) >> 8), \
95      (a[(n)+1] = (d) & 255)
96    
97    #define GET(a,n) \
98      (((a)[n] << 8) | (a)[(n)+1])
99    
100    #define MAX_PATTERN_SIZE (1 << 16)
101    
102    
103    #elif LINK_SIZE == 3
104    
105    #define PUT(a,n,d)       \
106      (a[n] = (d) >> 16),    \
107      (a[(n)+1] = (d) >> 8), \
108      (a[(n)+2] = (d) & 255)
109    
110    #define GET(a,n) \
111      (((a)[n] << 16) | ((a)[(n)+1] << 8) | (a)[(n)+2])
112    
113    #define MAX_PATTERN_SIZE (1 << 24)
114    
115    
116    #elif LINK_SIZE == 4
117    
118    #define PUT(a,n,d)        \
119      (a[n] = (d) >> 24),     \
120      (a[(n)+1] = (d) >> 16), \
121      (a[(n)+2] = (d) >> 8),  \
122      (a[(n)+3] = (d) & 255)
123    
124    #define GET(a,n) \
125      (((a)[n] << 24) | ((a)[(n)+1] << 16) | ((a)[(n)+2] << 8) | (a)[(n)+3])
126    
127    #define MAX_PATTERN_SIZE (1 << 30)   /* Keep it positive */
128    
129    
130    #else
131    #error LINK_SIZE must be either 2, 3, or 4
132  #endif  #endif
133    
134    
135    /* Convenience macro defined in terms of the others */
136    
137    #define PUTINC(a,n,d)   PUT(a,n,d), a += LINK_SIZE
138    
139    
140    /* PCRE uses some other 2-byte quantities that do not change when the size of
141    offsets changes. There are used for repeat counts and for other things such as
142    capturing parenthesis numbers in back references. */
143    
144    #define PUT2(a,n,d)   \
145      a[n] = (d) >> 8; \
146      a[(n)+1] = (d) & 255
147    
148    #define GET2(a,n) \
149      (((a)[n] << 8) | (a)[(n)+1])
150    
151    #define PUT2INC(a,n,d)  PUT2(a,n,d), a += 2
152    
153    
154  /* Standard C headers plus the external interface definition */  /* Standard C headers plus the external interface definition */
155    
156  #include <ctype.h>  #include <ctype.h>
# Line 55  define a macro for memmove() if HAVE_MEM Line 159  define a macro for memmove() if HAVE_MEM
159  #include <stdio.h>  #include <stdio.h>
160  #include <stdlib.h>  #include <stdlib.h>
161  #include <string.h>  #include <string.h>
162    
163    #ifndef PCRE_SPY
164    #define PCRE_DEFINITION       /* Win32 __declspec(export) trigger for .dll */
165    #endif
166    
167  #include "pcre.h"  #include "pcre.h"
168    
169  /* In case there is no definition of offsetof() provided - though any proper  /* In case there is no definition of offsetof() provided - though any proper
# Line 74  with negative values. The public options Line 183  with negative values. The public options
183  significant end. Make sure they don't overlap, though now that we have expanded  significant end. Make sure they don't overlap, though now that we have expanded
184  to four bytes there is plenty of space. */  to four bytes there is plenty of space. */
185    
186  #define PCRE_FIRSTSET      0x40000000  /* first_char is set */  #define PCRE_FIRSTSET      0x40000000  /* first_byte is set */
187  #define PCRE_REQCHSET      0x20000000  /* req_char is set */  #define PCRE_REQCHSET      0x20000000  /* req_byte is set */
188  #define PCRE_STARTLINE     0x10000000  /* start after \n for multiline */  #define PCRE_STARTLINE     0x10000000  /* start after \n for multiline */
189  #define PCRE_INGROUP       0x08000000  /* compiling inside a group */  #define PCRE_ICHANGED      0x08000000  /* i option changes within regex */
 #define PCRE_ICHANGED      0x04000000  /* i option changes within regex */  
190    
191  /* Options for the "extra" block produced by pcre_study(). */  /* Options for the "extra" block produced by pcre_study(). */
192    
# Line 89  time, run time or study time, respective Line 197  time, run time or study time, respective
197    
198  #define PUBLIC_OPTIONS \  #define PUBLIC_OPTIONS \
199    (PCRE_CASELESS|PCRE_EXTENDED|PCRE_ANCHORED|PCRE_MULTILINE| \    (PCRE_CASELESS|PCRE_EXTENDED|PCRE_ANCHORED|PCRE_MULTILINE| \
200     PCRE_DOTALL|PCRE_DOLLAR_ENDONLY|PCRE_EXTRA|PCRE_UNGREEDY)     PCRE_DOTALL|PCRE_DOLLAR_ENDONLY|PCRE_EXTRA|PCRE_UNGREEDY|PCRE_UTF8| \
201       PCRE_NO_AUTO_CAPTURE)
202    
203  #define PUBLIC_EXEC_OPTIONS \  #define PUBLIC_EXEC_OPTIONS \
204    (PCRE_ANCHORED|PCRE_NOTBOL|PCRE_NOTEOL|PCRE_NOTEMPTY)    (PCRE_ANCHORED|PCRE_NOTBOL|PCRE_NOTEOL|PCRE_NOTEMPTY)
# Line 100  time, run time or study time, respective Line 209  time, run time or study time, respective
209    
210  #define MAGIC_NUMBER  0x50435245UL   /* 'PCRE' */  #define MAGIC_NUMBER  0x50435245UL   /* 'PCRE' */
211    
212    /* Negative values for the firstchar and reqchar variables */
213    
214    #define REQ_UNSET (-2)
215    #define REQ_NONE  (-1)
216    
217    /* Flags added to firstbyte or reqbyte; a "non-literal" item is either a
218    variable-length repeat, or a anything other than literal characters. */
219    
220    #define REQ_CASELESS 0x0100    /* indicates caselessness */
221    #define REQ_VARY     0x0200    /* reqbyte followed non-literal item */
222    
223  /* Miscellaneous definitions */  /* Miscellaneous definitions */
224    
225  typedef int BOOL;  typedef int BOOL;
# Line 107  typedef int BOOL; Line 227  typedef int BOOL;
227  #define FALSE   0  #define FALSE   0
228  #define TRUE    1  #define TRUE    1
229    
230    /* Escape items that are just an encoding of a particular data value. Note that
231    ESC_n is defined as yet another macro, which is set in config.h to either \n
232    (the default) or \r (which some people want). */
233    
234    #ifndef ESC_e
235    #define ESC_e 27
236    #endif
237    
238    #ifndef ESC_f
239    #define ESC_f '\f'
240    #endif
241    
242    #ifndef ESC_n
243    #define ESC_n NEWLINE
244    #endif
245    
246    #ifndef ESC_r
247    #define ESC_r '\r'
248    #endif
249    
250    /* We can't officially use ESC_t because it is a POSIX reserved identifier
251    (presumably because of all the others like size_t). */
252    
253    #ifndef ESC_tee
254    #define ESC_tee '\t'
255    #endif
256    
257  /* These are escaped items that aren't just an encoding of a particular data  /* These are escaped items that aren't just an encoding of a particular data
258  value such as \n. They must have non-zero values, as check_escape() returns  value such as \n. They must have non-zero values, as check_escape() returns
259  their negation. Also, they must appear in the same order as in the opcode  their negation. Also, they must appear in the same order as in the opcode
260  definitions below, up to ESC_z. The final one must be ESC_REF as subsequent  definitions below, up to ESC_z. There's a dummy for OP_ANY because it
261  values are used for \1, \2, \3, etc. There is a test in the code for an escape  corresponds to "." rather than an escape sequence. The final one must be
262  greater than ESC_b and less than ESC_X to detect the types that may be  ESC_REF as subsequent values are used for \1, \2, \3, etc. There is are two
263  repeated. If any new escapes are put in-between that don't consume a character,  tests in the code for an escape greater than ESC_b and less than ESC_Z to
264  that code will have to change. */  detect the types that may be repeated. These are the types that consume a
265    character. If any new escapes are put in between that don't consume a
266    character, that code will have to change. */
267    
268    enum { ESC_A = 1, ESC_G, ESC_B, ESC_b, ESC_D, ESC_d, ESC_S, ESC_s, ESC_W,
269           ESC_w, ESC_dum1, ESC_C, ESC_Z, ESC_z, ESC_E, ESC_Q, ESC_REF };
270    
271    /* Flag bits and data types for the extended class (OP_XCLASS) for classes that
272    contain UTF-8 characters with values greater than 255. */
273    
274    #define XCL_NOT    0x01    /* Flag: this is a negative class */
275    #define XCL_MAP    0x02    /* Flag: a 32-byte map is present */
276    
277    #define XCL_END       0    /* Marks end of individual items */
278    #define XCL_SINGLE    1    /* Single item (one multibyte char) follows */
279    #define XCL_RANGE     2    /* A range (two multibyte chars) follows */
280    
 enum { ESC_A = 1, ESC_B, ESC_b, ESC_D, ESC_d, ESC_S, ESC_s, ESC_W, ESC_w,  
        ESC_Z, ESC_z, ESC_REF };  
281    
282  /* Opcode table: OP_BRA must be last, as all values >= it are used for brackets  /* Opcode table: OP_BRA must be last, as all values >= it are used for brackets
283  that extract substrings. Starting from 1 (i.e. after OP_END), the values up to  that extract substrings. Starting from 1 (i.e. after OP_END), the values up to
284  OP_EOD must correspond in order to the list of escapes immediately above. */  OP_EOD must correspond in order to the list of escapes immediately above.
285    Note that whenever this list is updated, the two macro definitions that follow
286    must also be updated to match. */
287    
288  enum {  enum {
289    OP_END,            /* End of pattern */    OP_END,            /* 0 End of pattern */
290    
291    /* Values corresponding to backslashed metacharacters */    /* Values corresponding to backslashed metacharacters */
292    
293    OP_SOD,            /* Start of data: \A */    OP_SOD,            /* 1 Start of data: \A */
294    OP_NOT_WORD_BOUNDARY,  /* \B */    OP_SOM,            /* 2 Start of match (subject + offset): \G */
295    OP_WORD_BOUNDARY,      /* \b */    OP_NOT_WORD_BOUNDARY,  /*  3 \B */
296    OP_NOT_DIGIT,          /* \D */    OP_WORD_BOUNDARY,      /*  4 \b */
297    OP_DIGIT,              /* \d */    OP_NOT_DIGIT,          /*  5 \D */
298    OP_NOT_WHITESPACE,     /* \S */    OP_DIGIT,              /*  6 \d */
299    OP_WHITESPACE,         /* \s */    OP_NOT_WHITESPACE,     /*  7 \S */
300    OP_NOT_WORDCHAR,       /* \W */    OP_WHITESPACE,         /*  8 \s */
301    OP_WORDCHAR,           /* \w */    OP_NOT_WORDCHAR,       /*  9 \W */
302    OP_EODN,           /* End of data or \n at end of data: \Z. */    OP_WORDCHAR,           /* 10 \w */
303    OP_EOD,            /* End of data: \z */    OP_ANY,            /* 11 Match any character */
304      OP_ANYBYTE,        /* 12 Match any byte (\C); different to OP_ANY for UTF-8 */
305    OP_OPT,            /* Set runtime options */    OP_EODN,           /* 13 End of data or \n at end of data: \Z. */
306    OP_CIRC,           /* Start of line - varies with multiline switch */    OP_EOD,            /* 14 End of data: \z */
307    OP_DOLL,           /* End of line - varies with multiline switch */  
308    OP_ANY,            /* Match any character */    OP_OPT,            /* 15 Set runtime options */
309    OP_CHARS,          /* Match string of characters */    OP_CIRC,           /* 16 Start of line - varies with multiline switch */
310    OP_NOT,            /* Match anything but the following char */    OP_DOLL,           /* 17 End of line - varies with multiline switch */
311      OP_CHARS,          /* 18 Match string of characters */
312    OP_STAR,           /* The maximizing and minimizing versions of */    OP_NOT,            /* 19 Match anything but the following char */
313    OP_MINSTAR,        /* all these opcodes must come in pairs, with */  
314    OP_PLUS,           /* the minimizing one second. */    OP_STAR,           /* 20 The maximizing and minimizing versions of */
315    OP_MINPLUS,        /* This first set applies to single characters */    OP_MINSTAR,        /* 21 all these opcodes must come in pairs, with */
316    OP_QUERY,    OP_PLUS,           /* 22 the minimizing one second. */
317    OP_MINQUERY,    OP_MINPLUS,        /* 23 This first set applies to single characters */
318    OP_UPTO,           /* From 0 to n matches */    OP_QUERY,          /* 24 */
319    OP_MINUPTO,    OP_MINQUERY,       /* 25 */
320    OP_EXACT,          /* Exactly n matches */    OP_UPTO,           /* 26 From 0 to n matches */
321      OP_MINUPTO,        /* 27 */
322    OP_NOTSTAR,        /* The maximizing and minimizing versions of */    OP_EXACT,          /* 28 Exactly n matches */
323    OP_NOTMINSTAR,     /* all these opcodes must come in pairs, with */  
324    OP_NOTPLUS,        /* the minimizing one second. */    OP_NOTSTAR,        /* 29 The maximizing and minimizing versions of */
325    OP_NOTMINPLUS,     /* This first set applies to "not" single characters */    OP_NOTMINSTAR,     /* 30 all these opcodes must come in pairs, with */
326    OP_NOTQUERY,    OP_NOTPLUS,        /* 31 the minimizing one second. */
327    OP_NOTMINQUERY,    OP_NOTMINPLUS,     /* 32 This set applies to "not" single characters */
328    OP_NOTUPTO,        /* From 0 to n matches */    OP_NOTQUERY,       /* 33 */
329    OP_NOTMINUPTO,    OP_NOTMINQUERY,    /* 34 */
330    OP_NOTEXACT,       /* Exactly n matches */    OP_NOTUPTO,        /* 35 From 0 to n matches */
331      OP_NOTMINUPTO,     /* 36 */
332    OP_TYPESTAR,       /* The maximizing and minimizing versions of */    OP_NOTEXACT,       /* 37 Exactly n matches */
333    OP_TYPEMINSTAR,    /* all these opcodes must come in pairs, with */  
334    OP_TYPEPLUS,       /* the minimizing one second. These codes must */    OP_TYPESTAR,       /* 38 The maximizing and minimizing versions of */
335    OP_TYPEMINPLUS,    /* be in exactly the same order as those above. */    OP_TYPEMINSTAR,    /* 39 all these opcodes must come in pairs, with */
336    OP_TYPEQUERY,      /* This set applies to character types such as \d */    OP_TYPEPLUS,       /* 40 the minimizing one second. These codes must */
337    OP_TYPEMINQUERY,    OP_TYPEMINPLUS,    /* 41 be in exactly the same order as those above. */
338    OP_TYPEUPTO,       /* From 0 to n matches */    OP_TYPEQUERY,      /* 42 This set applies to character types such as \d */
339    OP_TYPEMINUPTO,    OP_TYPEMINQUERY,   /* 43 */
340    OP_TYPEEXACT,      /* Exactly n matches */    OP_TYPEUPTO,       /* 44 From 0 to n matches */
341      OP_TYPEMINUPTO,    /* 45 */
342    OP_CRSTAR,         /* The maximizing and minimizing versions of */    OP_TYPEEXACT,      /* 46 Exactly n matches */
343    OP_CRMINSTAR,      /* all these opcodes must come in pairs, with */  
344    OP_CRPLUS,         /* the minimizing one second. These codes must */    OP_CRSTAR,         /* 47 The maximizing and minimizing versions of */
345    OP_CRMINPLUS,      /* be in exactly the same order as those above. */    OP_CRMINSTAR,      /* 48 all these opcodes must come in pairs, with */
346    OP_CRQUERY,        /* These are for character classes and back refs */    OP_CRPLUS,         /* 49 the minimizing one second. These codes must */
347    OP_CRMINQUERY,    OP_CRMINPLUS,      /* 50 be in exactly the same order as those above. */
348    OP_CRRANGE,        /* These are different to the three seta above. */    OP_CRQUERY,        /* 51 These are for character classes and back refs */
349    OP_CRMINRANGE,    OP_CRMINQUERY,     /* 52 */
350      OP_CRRANGE,        /* 53 These are different to the three seta above. */
351    OP_CLASS,          /* Match a character class */    OP_CRMINRANGE,     /* 54 */
352    OP_REF,            /* Match a back reference */  
353    OP_RECURSE,        /* Match this pattern recursively */    OP_CLASS,          /* 55 Match a character class, chars < 256 only */
354      OP_NCLASS,         /* 56 Same, but the bitmap was created from a negative
355    OP_ALT,            /* Start of alternation */                             class - the difference is relevant only when a UTF-8
356    OP_KET,            /* End of group that doesn't have an unbounded repeat */                             character > 255 is encountered. */
357    OP_KETRMAX,        /* These two must remain together and in this */  
358    OP_KETRMIN,        /* order. They are for groups the repeat for ever. */    OP_XCLASS,         /* 56 Extended class for handling UTF-8 chars within the
359                               class. This does both positive and negative. */
360    
361      OP_REF,            /* 57 Match a back reference */
362      OP_RECURSE,        /* 58 Match a numbered subpattern (possibly recursive) */
363      OP_CALLOUT,        /* 59 Call out to external function if provided */
364    
365      OP_ALT,            /* 60 Start of alternation */
366      OP_KET,            /* 61 End of group that doesn't have an unbounded repeat */
367      OP_KETRMAX,        /* 62 These two must remain together and in this */
368      OP_KETRMIN,        /* 63 order. They are for groups the repeat for ever. */
369    
370    /* The assertions must come before ONCE and COND */    /* The assertions must come before ONCE and COND */
371    
372    OP_ASSERT,         /* Positive lookahead */    OP_ASSERT,         /* 64 Positive lookahead */
373    OP_ASSERT_NOT,     /* Negative lookahead */    OP_ASSERT_NOT,     /* 65 Negative lookahead */
374    OP_ASSERTBACK,     /* Positive lookbehind */    OP_ASSERTBACK,     /* 66 Positive lookbehind */
375    OP_ASSERTBACK_NOT, /* Negative lookbehind */    OP_ASSERTBACK_NOT, /* 67 Negative lookbehind */
376    OP_REVERSE,        /* Move pointer back - used in lookbehind assertions */    OP_REVERSE,        /* 68 Move pointer back - used in lookbehind assertions */
377    
378    /* ONCE and COND must come after the assertions, with ONCE first, as there's    /* ONCE and COND must come after the assertions, with ONCE first, as there's
379    a test for >= ONCE for a subpattern that isn't an assertion. */    a test for >= ONCE for a subpattern that isn't an assertion. */
380    
381    OP_ONCE,           /* Once matched, don't back up into the subpattern */    OP_ONCE,           /* 69 Once matched, don't back up into the subpattern */
382    OP_COND,           /* Conditional group */    OP_COND,           /* 70 Conditional group */
383    OP_CREF,           /* Used to hold an extraction string number */    OP_CREF,           /* 71 Used to hold an extraction string number (cond ref) */
384    
385      OP_BRAZERO,        /* 72 These two must remain together and in this */
386      OP_BRAMINZERO,     /* 73 order. */
387    
388      OP_BRANUMBER,      /* 74 Used for extracting brackets whose number is greater
389                               than can fit into an opcode. */
390    
391      OP_BRA             /* 75 This and greater values are used for brackets that
392                               extract substrings up to a basic limit. After that,
393                               use is made of OP_BRANUMBER. */
394    };
395    
396    /* WARNING: There is an implicit assumption in study.c that all opcodes are
397    less than 128 in value. This makes handling UTF-8 character sequences easier.
398    */
399    
400    
401    OP_BRAZERO,        /* These two must remain together and in this */  /* This macro defines textual names for all the opcodes. There are used only
402    OP_BRAMINZERO,     /* order. */  for debugging, in pcre.c when DEBUG is defined, and also in pcretest.c. The
403    macro is referenced only in printint.c. */
404    
405    #define OP_NAME_LIST \
406      "End", "\\A", "\\G", "\\B", "\\b", "\\D", "\\d",                \
407      "\\S", "\\s", "\\W", "\\w", "Any", "Anybyte", "\\Z", "\\z",     \
408      "Opt", "^", "$", "chars", "not",                                \
409      "*", "*?", "+", "+?", "?", "??", "{", "{", "{",                 \
410      "*", "*?", "+", "+?", "?", "??", "{", "{", "{",                 \
411      "*", "*?", "+", "+?", "?", "??", "{", "{", "{",                 \
412      "*", "*?", "+", "+?", "?", "??", "{", "{",                      \
413      "class", "nclass", "xclass", "Ref", "Recurse", "Callout",       \
414      "Alt", "Ket", "KetRmax", "KetRmin", "Assert", "Assert not",     \
415      "AssertB", "AssertB not", "Reverse", "Once", "Cond", "Cond ref",\
416      "Brazero", "Braminzero", "Branumber", "Bra"
417    
418    
419    /* This macro defines the length of fixed length operations in the compiled
420    regex. The lengths are used when searching for specific things, and also in the
421    debugging printing of a compiled regex. We use a macro so that it can be
422    incorporated both into pcre.c and pcretest.c without being publicly exposed.
423    
424    As things have been extended, some of these are no longer fixed lenths, but are
425    minima instead. For example, the length of a single-character repeat may vary
426    in UTF-8 mode. The code that uses this table must know about such things. */
427    
428    #define OP_LENGTHS \
429      1,                             /* End                                    */ \
430      1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  /* \A, \G, \B, \B, \D, \d, \S, \s, \W, \w */ \
431      1, 1, 1, 1, 2, 1, 1,           /* Any, Anybyte, \Z, \z, Opt, ^, $        */ \
432      2,                             /* Chars - the minimum length             */ \
433      2,                             /* not                                    */ \
434      /* Positive single-char repeats                                          */ \
435      2, 2, 2, 2, 2, 2,              /* *, *?, +, +?, ?, ??      ** These are  */ \
436      4, 4, 4,                       /* upto, minupto, exact     ** minima     */ \
437      /* Negative single-char repeats                                          */ \
438      2, 2, 2, 2, 2, 2,              /* NOT *, *?, +, +?, ?, ??                */ \
439      4, 4, 4,                       /* NOT upto, minupto, exact               */ \
440      /* Positive type repeats                                                 */ \
441      2, 2, 2, 2, 2, 2,              /* Type *, *?, +, +?, ?, ??               */ \
442      4, 4, 4,                       /* Type upto, minupto, exact              */ \
443      /* Character class & ref repeats                                         */ \
444      1, 1, 1, 1, 1, 1,              /* *, *?, +, +?, ?, ??                    */ \
445      5, 5,                          /* CRRANGE, CRMINRANGE                    */ \
446     33,                             /* CLASS                                  */ \
447     33,                             /* NCLASS                                 */ \
448      0,                             /* XCLASS - variable length               */ \
449      3,                             /* REF                                    */ \
450      1+LINK_SIZE,                   /* RECURSE                                */ \
451      2,                             /* CALLOUT                                */ \
452      1+LINK_SIZE,                   /* Alt                                    */ \
453      1+LINK_SIZE,                   /* Ket                                    */ \
454      1+LINK_SIZE,                   /* KetRmax                                */ \
455      1+LINK_SIZE,                   /* KetRmin                                */ \
456      1+LINK_SIZE,                   /* Assert                                 */ \
457      1+LINK_SIZE,                   /* Assert not                             */ \
458      1+LINK_SIZE,                   /* Assert behind                          */ \
459      1+LINK_SIZE,                   /* Assert behind not                      */ \
460      1+LINK_SIZE,                   /* Reverse                                */ \
461      1+LINK_SIZE,                   /* Once                                   */ \
462      1+LINK_SIZE,                   /* COND                                   */ \
463      3,                             /* CREF                                   */ \
464      1, 1,                          /* BRAZERO, BRAMINZERO                    */ \
465      3,                             /* BRANUMBER                              */ \
466      1+LINK_SIZE                    /* BRA                                    */ \
467    
468    
469    /* The highest extraction number before we have to start using additional
470    bytes. (Originally PCRE didn't have support for extraction counts highter than
471    this number.) The value is limited by the number of opcodes left after OP_BRA,
472    i.e. 255 - OP_BRA. We actually set it a bit lower to leave room for additional
473    opcodes. */
474    
475    OP_BRA             /* This and greater values are used for brackets that  #define EXTRACT_BASIC_MAX  150
                         extract substrings. */  
 };  
476    
477  /* The highest extraction number. This is limited by the number of opcodes  /* A magic value for OP_CREF to indicate the "in recursion" condition. */
 left after OP_BRA, i.e. 255 - OP_BRA. We actually set it somewhat lower. */  
478    
479  #define EXTRACT_MAX  99  #define CREF_RECURSE  0xffff
480    
481  /* The texts of compile-time error messages are defined as macros here so that  /* The texts of compile-time error messages are defined as macros here so that
482  they can be accessed by the POSIX wrapper and converted into error codes.  Yes,  they can be accessed by the POSIX wrapper and converted into error codes.  Yes,
# Line 239  just to accommodate the POSIX wrapper. * Line 495  just to accommodate the POSIX wrapper. *
495  #define ERR10 "operand of unlimited repeat could match the empty string"  #define ERR10 "operand of unlimited repeat could match the empty string"
496  #define ERR11 "internal error: unexpected repeat"  #define ERR11 "internal error: unexpected repeat"
497  #define ERR12 "unrecognized character after (?"  #define ERR12 "unrecognized character after (?"
498  #define ERR13 "too many capturing parenthesized sub-patterns"  #define ERR13 "POSIX named classes are supported only within a class"
499  #define ERR14 "missing )"  #define ERR14 "missing )"
500  #define ERR15 "back reference to non-existent subpattern"  #define ERR15 "reference to non-existent subpattern"
501  #define ERR16 "erroffset passed as NULL"  #define ERR16 "erroffset passed as NULL"
502  #define ERR17 "unknown option bit(s) set"  #define ERR17 "unknown option bit(s) set"
503  #define ERR18 "missing ) after comment"  #define ERR18 "missing ) after comment"
504  #define ERR19 "too many sets of parentheses"  #define ERR19 "parentheses nested too deeply"
505  #define ERR20 "regular expression too large"  #define ERR20 "regular expression too large"
506  #define ERR21 "failed to get memory"  #define ERR21 "failed to get memory"
507  #define ERR22 "unmatched parentheses"  #define ERR22 "unmatched parentheses"
# Line 255  just to accommodate the POSIX wrapper. * Line 511  just to accommodate the POSIX wrapper. *
511  #define ERR26 "malformed number after (?("  #define ERR26 "malformed number after (?("
512  #define ERR27 "conditional group contains more than two branches"  #define ERR27 "conditional group contains more than two branches"
513  #define ERR28 "assertion expected after (?("  #define ERR28 "assertion expected after (?("
514  #define ERR29 "(?p must be followed by )"  #define ERR29 "(?R or (?digits must be followed by )"
515  #define ERR30 "unknown POSIX class name"  #define ERR30 "unknown POSIX class name"
516  #define ERR31 "POSIX collating elements are not supported"  #define ERR31 "POSIX collating elements are not supported"
517    #define ERR32 "this version of PCRE is not compiled with PCRE_UTF8 support"
518    #define ERR33 "spare error"
519    #define ERR34 "character value in \\x{...} sequence is too large"
520    #define ERR35 "invalid condition (?(0)"
521    #define ERR36 "\\C not allowed in lookbehind assertion"
522    #define ERR37 "PCRE does not support \\L, \\l, \\N, \\P, \\p, \\U, \\u, or \\X"
523    #define ERR38 "number after (?C is > 255"
524    #define ERR39 "closing ) for (?C expected"
525    #define ERR40 "recursive call could loop indefinitely"
526    #define ERR41 "unrecognized character after (?P"
527    #define ERR42 "syntax error after (?P"
528    #define ERR43 "two named groups have the same name"
529    
530  /* All character handling must be done as unsigned characters. Otherwise there  /* All character handling must be done as unsigned characters. Otherwise there
531  are problems with top-bit-set characters and functions such as isspace().  are problems with top-bit-set characters and functions such as isspace().
# Line 268  Unix, where it is defined in sys/types, Line 536  Unix, where it is defined in sys/types,
536    
537  typedef unsigned char uschar;  typedef unsigned char uschar;
538    
539  /* The real format of the start of the pcre block; the actual code vector  /* The real format of the start of the pcre block; the index of names and the
540  runs on as long as necessary after the end. */  code vector run on as long as necessary after the end. */
541    
542  typedef struct real_pcre {  typedef struct real_pcre {
543    unsigned long int magic_number;    unsigned long int magic_number;
544    size_t size;    size_t size;                        /* Total that was malloced */
545    const unsigned char *tables;    const unsigned char *tables;        /* Pointer to tables */
546    unsigned long int options;    unsigned long int options;
547    uschar top_bracket;    unsigned short int top_bracket;
548    uschar top_backref;    unsigned short int top_backref;
549    uschar first_char;    unsigned short int first_byte;
550    uschar req_char;    unsigned short int req_byte;
551    uschar code[1];    unsigned short int name_entry_size; /* Size of any name items; 0 => none */
552      unsigned short int name_count;      /* Number of name items */
553  } real_pcre;  } real_pcre;
554    
555  /* The real format of the extra block returned by pcre_study(). */  /* The format of the block used to store data from pcre_study(). */
556    
557  typedef struct real_pcre_extra {  typedef struct pcre_study_data {
558      size_t size;                        /* Total that was malloced */
559    uschar options;    uschar options;
560    uschar start_bits[32];    uschar start_bits[32];
561  } real_pcre_extra;  } pcre_study_data;
   
562    
563  /* Structure for passing "static" information around between the functions  /* Structure for passing "static" information around between the functions
564  doing the compiling, so that they are thread-safe. */  doing the compiling, so that they are thread-safe. */
# Line 299  typedef struct compile_data { Line 568  typedef struct compile_data {
568    const uschar *fcc;            /* Points to case-flipping table */    const uschar *fcc;            /* Points to case-flipping table */
569    const uschar *cbits;          /* Points to character type table */    const uschar *cbits;          /* Points to character type table */
570    const uschar *ctypes;         /* Points to table of type maps */    const uschar *ctypes;         /* Points to table of type maps */
571      const uschar *start_code;     /* The start of the compiled code */
572      uschar *name_table;           /* The name/number table */
573      int  names_found;             /* Number of entries so far */
574      int  name_entry_size;         /* Size of each entry */
575      int  top_backref;             /* Maximum back reference */
576      unsigned int backref_map;     /* Bitmap of low back refs */
577      int  req_varyopt;             /* "After variable item" flag for reqbyte */
578  } compile_data;  } compile_data;
579    
580    /* Structure for maintaining a chain of pointers to the currently incomplete
581    branches, for testing for left recursion. */
582    
583    typedef struct branch_chain {
584      struct branch_chain *outer;
585      uschar *current;
586    } branch_chain;
587    
588    /* Structure for items in a linked list that represents an explicit recursive
589    call within the pattern. */
590    
591    typedef struct recursion_info {
592      struct recursion_info *prev;  /* Previous recursion record (or NULL) */
593      int group_num;                /* Number of group that was called */
594      const uschar *after_call;     /* "Return value": points after the call in the expr */
595      const uschar *save_start;     /* Old value of md->start_match */
596      int *offset_save;             /* Pointer to start of saved offsets */
597      int saved_max;                /* Number of saved offsets */
598    } recursion_info;
599    
600  /* Structure for passing "static" information around between the functions  /* Structure for passing "static" information around between the functions
601  doing the matching, so that they are thread-safe. */  doing the matching, so that they are thread-safe. */
602    
603  typedef struct match_data {  typedef struct match_data {
604    int    errorcode;             /* As it says */    unsigned long int match_call_count; /* As it says */
605      unsigned long int match_limit;/* As it says */
606    int   *offset_vector;         /* Offset vector */    int   *offset_vector;         /* Offset vector */
607    int    offset_end;            /* One past the end */    int    offset_end;            /* One past the end */
608    int    offset_max;            /* The maximum usable for return data */    int    offset_max;            /* The maximum usable for return data */
# Line 314  typedef struct match_data { Line 611  typedef struct match_data {
611    BOOL   offset_overflow;       /* Set if too many extractions */    BOOL   offset_overflow;       /* Set if too many extractions */
612    BOOL   notbol;                /* NOTBOL flag */    BOOL   notbol;                /* NOTBOL flag */
613    BOOL   noteol;                /* NOTEOL flag */    BOOL   noteol;                /* NOTEOL flag */
614      BOOL   utf8;                  /* UTF8 flag */
615    BOOL   endonly;               /* Dollar not before final \n */    BOOL   endonly;               /* Dollar not before final \n */
616    BOOL   notempty;              /* Empty string match not wanted */    BOOL   notempty;              /* Empty string match not wanted */
617    const uschar *start_pattern;  /* For use when recursing */    const uschar *start_code;     /* For use when recursing */
618    const uschar *start_subject;  /* Start of the subject string */    const uschar *start_subject;  /* Start of the subject string */
619    const uschar *end_subject;    /* End of the subject string */    const uschar *end_subject;    /* End of the subject string */
620    const uschar *start_match;    /* Start of this match attempt */    const uschar *start_match;    /* Start of this match attempt */
621    const uschar *end_match_ptr;  /* Subject position at end match */    const uschar *end_match_ptr;  /* Subject position at end match */
622    int    end_offset_top;        /* Highwater mark at end of match */    int    end_offset_top;        /* Highwater mark at end of match */
623      int    capture_last;          /* Most recent capture number */
624      int    start_offset;          /* The start offset value */
625      recursion_info *recursive;    /* Linked list of recursion data */
626      void  *callout_data;          /* To pass back to callouts */
627  } match_data;  } match_data;
628    
629  /* Bit definitions for entries in the pcre_ctypes table. */  /* Bit definitions for entries in the pcre_ctypes table. */

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