/[pcre]/code/tags/pcre-4.3/internal.h
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revision 53 by nigel, Sat Feb 24 21:39:42 2007 UTC revision 63 by nigel, Sat Feb 24 21:40:03 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) 1997-2001 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, provided that HAVE_BCOPY  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  is set. Otherwise, include an emulating function for those systems that have
# Line 50  case in PCRE. */ Line 61  case in PCRE. */
61  #undef  memmove        /* some systems may have a macro */  #undef  memmove        /* some systems may have a macro */
62  #if HAVE_BCOPY  #if HAVE_BCOPY
63  #define memmove(a, b, c) bcopy(b, a, c)  #define memmove(a, b, c) bcopy(b, a, c)
64  #else  #else  /* HAVE_BCOPY */
65  void *  void *
66  pcre_memmove(unsigned char *dest, const unsigned char *src, size_t n)  pcre_memmove(unsigned char *dest, const unsigned char *src, size_t n)
67  {  {
# Line 60  src += n; Line 71  src += n;
71  for (i = 0; i < n; ++i) *(--dest) =  *(--src);  for (i = 0; i < n; ++i) *(--dest) =  *(--src);
72  }  }
73  #define memmove(a, b, c) pcre_memmove(a, b, c)  #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  #endif  
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    
# Line 71  for (i = 0; i < n; ++i) *(--dest) = *(- Line 159  for (i = 0; i < n; ++i) *(--dest) = *(-
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 90  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 105  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_UTF8)     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 116  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 firstchar or reqchar */
218    
219    #define REQ_CASELESS 0x0100    /* indicates caselessness */
220    #define REQ_EOL      0x0200    /* indicates reqchar followed by $ */
221    
222  /* Miscellaneous definitions */  /* Miscellaneous definitions */
223    
224  typedef int BOOL;  typedef int BOOL;
# Line 124  typedef int BOOL; Line 227  typedef int BOOL;
227  #define TRUE    1  #define TRUE    1
228    
229  /* Escape items that are just an encoding of a particular data value. Note that  /* Escape items that are just an encoding of a particular data value. Note that
230  ESC_N is defined as yet another macro, which is set in config.h to either \n  ESC_n is defined as yet another macro, which is set in config.h to either \n
231  (the default) or \r (which some people want). */  (the default) or \r (which some people want). */
232    
233  #ifndef ESC_E  #ifndef ESC_e
234  #define ESC_E 27  #define ESC_e 27
235  #endif  #endif
236    
237  #ifndef ESC_F  #ifndef ESC_f
238  #define ESC_F '\f'  #define ESC_f '\f'
239  #endif  #endif
240    
241  #ifndef ESC_N  #ifndef ESC_n
242  #define ESC_N NEWLINE  #define ESC_n NEWLINE
243  #endif  #endif
244    
245  #ifndef ESC_R  #ifndef ESC_r
246  #define ESC_R '\r'  #define ESC_r '\r'
247  #endif  #endif
248    
249  #ifndef ESC_T  #ifndef ESC_t
250  #define ESC_T '\t'  #define ESC_t '\t'
251  #endif  #endif
252    
253  /* 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
254  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
255  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
256  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
257  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
258  greater than ESC_b and less than ESC_Z to detect the types that may be  ESC_REF as subsequent values are used for \1, \2, \3, etc. There is are two
259  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
260  that code will have to change. */  detect the types that may be repeated. These are the types that consume a
261    character. If any new escapes are put in between that don't consume a
262    character, that code will have to change. */
263    
264    enum { ESC_A = 1, ESC_G, ESC_B, ESC_b, ESC_D, ESC_d, ESC_S, ESC_s, ESC_W,
265           ESC_w, ESC_dum1, ESC_C, ESC_Z, ESC_z, ESC_E, ESC_Q, ESC_REF };
266    
267    /* Flag bits and data types for the extended class (OP_XCLASS) for classes that
268    contain UTF-8 characters with values greater than 255. */
269    
270    #define XCL_NOT    0x01    /* Flag: this is a negative class */
271    #define XCL_MAP    0x02    /* Flag: a 32-byte map is present */
272    
273    #define XCL_END       0    /* Marks end of individual items */
274    #define XCL_SINGLE    1    /* Single item (one multibyte char) follows */
275    #define XCL_RANGE     2    /* A range (two multibyte chars) follows */
276    
 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 };  
277    
278  /* 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
279  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
280  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.
281    Note that whenever this list is updated, the two macro definitions that follow
282    must also be updated to match. */
283    
284  enum {  enum {
285    OP_END,            /* End of pattern */    OP_END,            /* 0 End of pattern */
286    
287    /* Values corresponding to backslashed metacharacters */    /* Values corresponding to backslashed metacharacters */
288    
289    OP_SOD,            /* Start of data: \A */    OP_SOD,            /* 1 Start of data: \A */
290    OP_NOT_WORD_BOUNDARY,  /* \B */    OP_SOM,            /* 2 Start of match (subject + offset): \G */
291    OP_WORD_BOUNDARY,      /* \b */    OP_NOT_WORD_BOUNDARY,  /*  3 \B */
292    OP_NOT_DIGIT,          /* \D */    OP_WORD_BOUNDARY,      /*  4 \b */
293    OP_DIGIT,              /* \d */    OP_NOT_DIGIT,          /*  5 \D */
294    OP_NOT_WHITESPACE,     /* \S */    OP_DIGIT,              /*  6 \d */
295    OP_WHITESPACE,         /* \s */    OP_NOT_WHITESPACE,     /*  7 \S */
296    OP_NOT_WORDCHAR,       /* \W */    OP_WHITESPACE,         /*  8 \s */
297    OP_WORDCHAR,           /* \w */    OP_NOT_WORDCHAR,       /*  9 \W */
298    OP_EODN,           /* End of data or \n at end of data: \Z. */    OP_WORDCHAR,           /* 10 \w */
299    OP_EOD,            /* End of data: \z */    OP_ANY,            /* 11 Match any character */
300      OP_ANYBYTE,        /* 12 Match any byte (\C); different to OP_ANY for UTF-8 */
301    OP_OPT,            /* Set runtime options */    OP_EODN,           /* 13 End of data or \n at end of data: \Z. */
302    OP_CIRC,           /* Start of line - varies with multiline switch */    OP_EOD,            /* 14 End of data: \z */
303    OP_DOLL,           /* End of line - varies with multiline switch */  
304    OP_ANY,            /* Match any character */    OP_OPT,            /* 15 Set runtime options */
305    OP_CHARS,          /* Match string of characters */    OP_CIRC,           /* 16 Start of line - varies with multiline switch */
306    OP_NOT,            /* Match anything but the following char */    OP_DOLL,           /* 17 End of line - varies with multiline switch */
307      OP_CHARS,          /* 18 Match string of characters */
308    OP_STAR,           /* The maximizing and minimizing versions of */    OP_NOT,            /* 19 Match anything but the following char */
309    OP_MINSTAR,        /* all these opcodes must come in pairs, with */  
310    OP_PLUS,           /* the minimizing one second. */    OP_STAR,           /* 20 The maximizing and minimizing versions of */
311    OP_MINPLUS,        /* This first set applies to single characters */    OP_MINSTAR,        /* 21 all these opcodes must come in pairs, with */
312    OP_QUERY,    OP_PLUS,           /* 22 the minimizing one second. */
313    OP_MINQUERY,    OP_MINPLUS,        /* 23 This first set applies to single characters */
314    OP_UPTO,           /* From 0 to n matches */    OP_QUERY,          /* 24 */
315    OP_MINUPTO,    OP_MINQUERY,       /* 25 */
316    OP_EXACT,          /* Exactly n matches */    OP_UPTO,           /* 26 From 0 to n matches */
317      OP_MINUPTO,        /* 27 */
318    OP_NOTSTAR,        /* The maximizing and minimizing versions of */    OP_EXACT,          /* 28 Exactly n matches */
319    OP_NOTMINSTAR,     /* all these opcodes must come in pairs, with */  
320    OP_NOTPLUS,        /* the minimizing one second. */    OP_NOTSTAR,        /* 29 The maximizing and minimizing versions of */
321    OP_NOTMINPLUS,     /* This first set applies to "not" single characters */    OP_NOTMINSTAR,     /* 30 all these opcodes must come in pairs, with */
322    OP_NOTQUERY,    OP_NOTPLUS,        /* 31 the minimizing one second. */
323    OP_NOTMINQUERY,    OP_NOTMINPLUS,     /* 32 This set applies to "not" single characters */
324    OP_NOTUPTO,        /* From 0 to n matches */    OP_NOTQUERY,       /* 33 */
325    OP_NOTMINUPTO,    OP_NOTMINQUERY,    /* 34 */
326    OP_NOTEXACT,       /* Exactly n matches */    OP_NOTUPTO,        /* 35 From 0 to n matches */
327      OP_NOTMINUPTO,     /* 36 */
328    OP_TYPESTAR,       /* The maximizing and minimizing versions of */    OP_NOTEXACT,       /* 37 Exactly n matches */
329    OP_TYPEMINSTAR,    /* all these opcodes must come in pairs, with */  
330    OP_TYPEPLUS,       /* the minimizing one second. These codes must */    OP_TYPESTAR,       /* 38 The maximizing and minimizing versions of */
331    OP_TYPEMINPLUS,    /* be in exactly the same order as those above. */    OP_TYPEMINSTAR,    /* 39 all these opcodes must come in pairs, with */
332    OP_TYPEQUERY,      /* This set applies to character types such as \d */    OP_TYPEPLUS,       /* 40 the minimizing one second. These codes must */
333    OP_TYPEMINQUERY,    OP_TYPEMINPLUS,    /* 41 be in exactly the same order as those above. */
334    OP_TYPEUPTO,       /* From 0 to n matches */    OP_TYPEQUERY,      /* 42 This set applies to character types such as \d */
335    OP_TYPEMINUPTO,    OP_TYPEMINQUERY,   /* 43 */
336    OP_TYPEEXACT,      /* Exactly n matches */    OP_TYPEUPTO,       /* 44 From 0 to n matches */
337      OP_TYPEMINUPTO,    /* 45 */
338    OP_CRSTAR,         /* The maximizing and minimizing versions of */    OP_TYPEEXACT,      /* 46 Exactly n matches */
339    OP_CRMINSTAR,      /* all these opcodes must come in pairs, with */  
340    OP_CRPLUS,         /* the minimizing one second. These codes must */    OP_CRSTAR,         /* 47 The maximizing and minimizing versions of */
341    OP_CRMINPLUS,      /* be in exactly the same order as those above. */    OP_CRMINSTAR,      /* 48 all these opcodes must come in pairs, with */
342    OP_CRQUERY,        /* These are for character classes and back refs */    OP_CRPLUS,         /* 49 the minimizing one second. These codes must */
343    OP_CRMINQUERY,    OP_CRMINPLUS,      /* 50 be in exactly the same order as those above. */
344    OP_CRRANGE,        /* These are different to the three seta above. */    OP_CRQUERY,        /* 51 These are for character classes and back refs */
345    OP_CRMINRANGE,    OP_CRMINQUERY,     /* 52 */
346      OP_CRRANGE,        /* 53 These are different to the three seta above. */
347    OP_CLASS,          /* Match a character class */    OP_CRMINRANGE,     /* 54 */
348    OP_REF,            /* Match a back reference */  
349    OP_RECURSE,        /* Match this pattern recursively */    OP_CLASS,          /* 55 Match a character class, chars < 256 only */
350      OP_NCLASS,         /* 56 Same, but the bitmap was created from a negative
351    OP_ALT,            /* Start of alternation */                             class - the difference is relevant only when a UTF-8
352    OP_KET,            /* End of group that doesn't have an unbounded repeat */                             character > 255 is encountered. */
353    OP_KETRMAX,        /* These two must remain together and in this */  
354    OP_KETRMIN,        /* order. They are for groups the repeat for ever. */    OP_XCLASS,         /* 56 Extended class for handling UTF-8 chars within the
355                               class. This does both positive and negative. */
356    
357      OP_REF,            /* 57 Match a back reference */
358      OP_RECURSE,        /* 58 Match a numbered subpattern (possibly recursive) */
359      OP_CALLOUT,        /* 59 Call out to external function if provided */
360    
361      OP_ALT,            /* 60 Start of alternation */
362      OP_KET,            /* 61 End of group that doesn't have an unbounded repeat */
363      OP_KETRMAX,        /* 62 These two must remain together and in this */
364      OP_KETRMIN,        /* 63 order. They are for groups the repeat for ever. */
365    
366    /* The assertions must come before ONCE and COND */    /* The assertions must come before ONCE and COND */
367    
368    OP_ASSERT,         /* Positive lookahead */    OP_ASSERT,         /* 64 Positive lookahead */
369    OP_ASSERT_NOT,     /* Negative lookahead */    OP_ASSERT_NOT,     /* 65 Negative lookahead */
370    OP_ASSERTBACK,     /* Positive lookbehind */    OP_ASSERTBACK,     /* 66 Positive lookbehind */
371    OP_ASSERTBACK_NOT, /* Negative lookbehind */    OP_ASSERTBACK_NOT, /* 67 Negative lookbehind */
372    OP_REVERSE,        /* Move pointer back - used in lookbehind assertions */    OP_REVERSE,        /* 68 Move pointer back - used in lookbehind assertions */
373    
374    /* 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
375    a test for >= ONCE for a subpattern that isn't an assertion. */    a test for >= ONCE for a subpattern that isn't an assertion. */
376    
377    OP_ONCE,           /* Once matched, don't back up into the subpattern */    OP_ONCE,           /* 69 Once matched, don't back up into the subpattern */
378    OP_COND,           /* Conditional group */    OP_COND,           /* 70 Conditional group */
379    OP_CREF,           /* Used to hold an extraction string number (cond ref) */    OP_CREF,           /* 71 Used to hold an extraction string number (cond ref) */
380    
381    OP_BRAZERO,        /* These two must remain together and in this */    OP_BRAZERO,        /* 72 These two must remain together and in this */
382    OP_BRAMINZERO,     /* order. */    OP_BRAMINZERO,     /* 73 order. */
383    
384    OP_BRANUMBER,      /* Used for extracting brackets whose number is greater    OP_BRANUMBER,      /* 74 Used for extracting brackets whose number is greater
385                          than can fit into an opcode. */                             than can fit into an opcode. */
386    
387    OP_BRA             /* This and greater values are used for brackets that    OP_BRA             /* 75 This and greater values are used for brackets that
388                          extract substrings up to a basic limit. After that,                             extract substrings up to a basic limit. After that,
389                          use is made of OP_BRANUMBER. */                             use is made of OP_BRANUMBER. */
390  };  };
391    
392    /* WARNING: There is an implicit assumption in study.c that all opcodes are
393    less than 128 in value. This makes handling UTF-8 character sequences easier.
394    */
395    
396    
397    /* This macro defines textual names for all the opcodes. There are used only
398    for debugging, in pcre.c when DEBUG is defined, and also in pcretest.c. The
399    macro is referenced only in printint.c. */
400    
401    #define OP_NAME_LIST \
402      "End", "\\A", "\\G", "\\B", "\\b", "\\D", "\\d",                \
403      "\\S", "\\s", "\\W", "\\w", "Any", "Anybyte", "\\Z", "\\z",     \
404      "Opt", "^", "$", "chars", "not",                                \
405      "*", "*?", "+", "+?", "?", "??", "{", "{", "{",                 \
406      "*", "*?", "+", "+?", "?", "??", "{", "{", "{",                 \
407      "*", "*?", "+", "+?", "?", "??", "{", "{", "{",                 \
408      "*", "*?", "+", "+?", "?", "??", "{", "{",                      \
409      "class", "nclass", "xclass", "Ref", "Recurse", "Callout",       \
410      "Alt", "Ket", "KetRmax", "KetRmin", "Assert", "Assert not",     \
411      "AssertB", "AssertB not", "Reverse", "Once", "Cond", "Cond ref",\
412      "Brazero", "Braminzero", "Branumber", "Bra"
413    
414    
415    /* This macro defines the length of fixed length operations in the compiled
416    regex. The lengths are used when searching for specific things, and also in the
417    debugging printing of a compiled regex. We use a macro so that it can be
418    incorporated both into pcre.c and pcretest.c without being publicly exposed.
419    
420    As things have been extended, some of these are no longer fixed lenths, but are
421    minima instead. For example, the length of a single-character repeat may vary
422    in UTF-8 mode. The code that uses this table must know about such things. */
423    
424    #define OP_LENGTHS \
425      1,                             /* End                                    */ \
426      1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  /* \A, \G, \B, \B, \D, \d, \S, \s, \W, \w */ \
427      1, 1, 1, 1, 2, 1, 1,           /* Any, Anybyte, \Z, \z, Opt, ^, $        */ \
428      2,                             /* Chars - the minimum length             */ \
429      2,                             /* not                                    */ \
430      /* Positive single-char repeats                                          */ \
431      2, 2, 2, 2, 2, 2,              /* *, *?, +, +?, ?, ??      ** These are  */ \
432      4, 4, 4,                       /* upto, minupto, exact     ** minima     */ \
433      /* Negative single-char repeats                                          */ \
434      2, 2, 2, 2, 2, 2,              /* NOT *, *?, +, +?, ?, ??                */ \
435      4, 4, 4,                       /* NOT upto, minupto, exact               */ \
436      /* Positive type repeats                                                 */ \
437      2, 2, 2, 2, 2, 2,              /* Type *, *?, +, +?, ?, ??               */ \
438      4, 4, 4,                       /* Type upto, minupto, exact              */ \
439      /* Character class & ref repeats                                         */ \
440      1, 1, 1, 1, 1, 1,              /* *, *?, +, +?, ?, ??                    */ \
441      5, 5,                          /* CRRANGE, CRMINRANGE                    */ \
442     33,                             /* CLASS                                  */ \
443     33,                             /* NCLASS                                 */ \
444      0,                             /* XCLASS - variable length               */ \
445      3,                             /* REF                                    */ \
446      1+LINK_SIZE,                   /* RECURSE                                */ \
447      2,                             /* CALLOUT                                */ \
448      1+LINK_SIZE,                   /* Alt                                    */ \
449      1+LINK_SIZE,                   /* Ket                                    */ \
450      1+LINK_SIZE,                   /* KetRmax                                */ \
451      1+LINK_SIZE,                   /* KetRmin                                */ \
452      1+LINK_SIZE,                   /* Assert                                 */ \
453      1+LINK_SIZE,                   /* Assert not                             */ \
454      1+LINK_SIZE,                   /* Assert behind                          */ \
455      1+LINK_SIZE,                   /* Assert behind not                      */ \
456      1+LINK_SIZE,                   /* Reverse                                */ \
457      1+LINK_SIZE,                   /* Once                                   */ \
458      1+LINK_SIZE,                   /* COND                                   */ \
459      3,                             /* CREF                                   */ \
460      1, 1,                          /* BRAZERO, BRAMINZERO                    */ \
461      3,                             /* BRANUMBER                              */ \
462      1+LINK_SIZE                    /* BRA                                    */ \
463    
464    
465  /* The highest extraction number before we have to start using additional  /* The highest extraction number before we have to start using additional
466  bytes. (Originally PCRE didn't have support for extraction counts highter than  bytes. (Originally PCRE didn't have support for extraction counts highter than
467  this number.) The value is limited by the number of opcodes left after OP_BRA,  this number.) The value is limited by the number of opcodes left after OP_BRA,
# Line 269  opcodes. */ Line 470  opcodes. */
470    
471  #define EXTRACT_BASIC_MAX  150  #define EXTRACT_BASIC_MAX  150
472    
473    /* A magic value for OP_CREF to indicate the "in recursion" condition. */
474    
475    #define CREF_RECURSE  0xffff
476    
477  /* 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
478  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,
479  I could have used error codes in the first place, but didn't feel like changing  I could have used error codes in the first place, but didn't feel like changing
# Line 286  just to accommodate the POSIX wrapper. * Line 491  just to accommodate the POSIX wrapper. *
491  #define ERR10 "operand of unlimited repeat could match the empty string"  #define ERR10 "operand of unlimited repeat could match the empty string"
492  #define ERR11 "internal error: unexpected repeat"  #define ERR11 "internal error: unexpected repeat"
493  #define ERR12 "unrecognized character after (?"  #define ERR12 "unrecognized character after (?"
494  #define ERR13 "unused error"  #define ERR13 "POSIX named classes are supported only within a class"
495  #define ERR14 "missing )"  #define ERR14 "missing )"
496  #define ERR15 "back reference to non-existent subpattern"  #define ERR15 "reference to non-existent subpattern"
497  #define ERR16 "erroffset passed as NULL"  #define ERR16 "erroffset passed as NULL"
498  #define ERR17 "unknown option bit(s) set"  #define ERR17 "unknown option bit(s) set"
499  #define ERR18 "missing ) after comment"  #define ERR18 "missing ) after comment"
# Line 302  just to accommodate the POSIX wrapper. * Line 507  just to accommodate the POSIX wrapper. *
507  #define ERR26 "malformed number after (?("  #define ERR26 "malformed number after (?("
508  #define ERR27 "conditional group contains more than two branches"  #define ERR27 "conditional group contains more than two branches"
509  #define ERR28 "assertion expected after (?("  #define ERR28 "assertion expected after (?("
510  #define ERR29 "(?p must be followed by )"  #define ERR29 "(?R or (?digits must be followed by )"
511  #define ERR30 "unknown POSIX class name"  #define ERR30 "unknown POSIX class name"
512  #define ERR31 "POSIX collating elements are not supported"  #define ERR31 "POSIX collating elements are not supported"
513  #define ERR32 "this version of PCRE is not compiled with PCRE_UTF8 support"  #define ERR32 "this version of PCRE is not compiled with PCRE_UTF8 support"
514  #define ERR33 "characters with values > 255 are not yet supported in classes"  #define ERR33 "spare error"
515  #define ERR34 "character value in \\x{...} sequence is too large"  #define ERR34 "character value in \\x{...} sequence is too large"
516  #define ERR35 "invalid condition (?(0)"  #define ERR35 "invalid condition (?(0)"
517    #define ERR36 "\\C not allowed in lookbehind assertion"
518    #define ERR37 "PCRE does not support \\L, \\l, \\N, \\P, \\p, \\U, \\u, or \\X"
519    #define ERR38 "number after (?C is > 255"
520    #define ERR39 "closing ) for (?C expected"
521    #define ERR40 "recursive call could loop indefinitely"
522    #define ERR41 "unrecognized character after (?P"
523    #define ERR42 "syntax error after (?P"
524    #define ERR43 "two named groups have the same name"
525    
526  /* All character handling must be done as unsigned characters. Otherwise there  /* All character handling must be done as unsigned characters. Otherwise there
527  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 319  Unix, where it is defined in sys/types, Line 532  Unix, where it is defined in sys/types,
532    
533  typedef unsigned char uschar;  typedef unsigned char uschar;
534    
535  /* 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
536  runs on as long as necessary after the end. */  code vector run on as long as necessary after the end. */
537    
538  typedef struct real_pcre {  typedef struct real_pcre {
539    unsigned long int magic_number;    unsigned long int magic_number;
540    size_t size;    size_t size;                        /* Total that was malloced */
541    const unsigned char *tables;    const unsigned char *tables;        /* Pointer to tables */
542    unsigned long int options;    unsigned long int options;
543    unsigned short int top_bracket;    unsigned short int top_bracket;
544    unsigned short int top_backref;    unsigned short int top_backref;
545    uschar first_char;    unsigned short int first_byte;
546    uschar req_char;    unsigned short int req_byte;
547    uschar code[1];    unsigned short int name_entry_size; /* Size of any name items; 0 => none */
548      unsigned short int name_count;      /* Number of name items */
549  } real_pcre;  } real_pcre;
550    
551  /* The real format of the extra block returned by pcre_study(). */  /* The format of the block used to store data from pcre_study(). */
552    
553  typedef struct real_pcre_extra {  typedef struct pcre_study_data {
554      size_t size;                        /* Total that was malloced */
555    uschar options;    uschar options;
556    uschar start_bits[32];    uschar start_bits[32];
557  } real_pcre_extra;  } pcre_study_data;
   
558    
559  /* Structure for passing "static" information around between the functions  /* Structure for passing "static" information around between the functions
560  doing the compiling, so that they are thread-safe. */  doing the compiling, so that they are thread-safe. */
# Line 350  typedef struct compile_data { Line 564  typedef struct compile_data {
564    const uschar *fcc;            /* Points to case-flipping table */    const uschar *fcc;            /* Points to case-flipping table */
565    const uschar *cbits;          /* Points to character type table */    const uschar *cbits;          /* Points to character type table */
566    const uschar *ctypes;         /* Points to table of type maps */    const uschar *ctypes;         /* Points to table of type maps */
567      const uschar *start_code;     /* The start of the compiled code */
568      uschar *name_table;           /* The name/number table */
569      int  names_found;             /* Number of entries so far */
570      int  name_entry_size;         /* Size of each entry */
571      int  top_backref;             /* Maximum back reference */
572      unsigned int backref_map;     /* Bitmap of low back refs */
573  } compile_data;  } compile_data;
574    
575    /* Structure for maintaining a chain of pointers to the currently incomplete
576    branches, for testing for left recursion. */
577    
578    typedef struct branch_chain {
579      struct branch_chain *outer;
580      uschar *current;
581    } branch_chain;
582    
583    /* Structure for items in a linked list that represents an explicit recursive
584    call within the pattern. */
585    
586    typedef struct recursion_info {
587      struct recursion_info *prev;  /* Previous recursion record (or NULL) */
588      int group_num;                /* Number of group that was called */
589      const uschar *after_call;     /* "Return value": points after the call in the expr */
590      const uschar *save_start;     /* Old value of md->start_match */
591      int *offset_save;             /* Pointer to start of saved offsets */
592      int saved_max;                /* Number of saved offsets */
593    } recursion_info;
594    
595  /* Structure for passing "static" information around between the functions  /* Structure for passing "static" information around between the functions
596  doing the matching, so that they are thread-safe. */  doing the matching, so that they are thread-safe. */
597    
598  typedef struct match_data {  typedef struct match_data {
599    int    errorcode;             /* As it says */    int    match_call_count;      /* As it says */
600      int    match_limit;           /* As it says */
601    int   *offset_vector;         /* Offset vector */    int   *offset_vector;         /* Offset vector */
602    int    offset_end;            /* One past the end */    int    offset_end;            /* One past the end */
603    int    offset_max;            /* The maximum usable for return data */    int    offset_max;            /* The maximum usable for return data */
# Line 368  typedef struct match_data { Line 609  typedef struct match_data {
609    BOOL   utf8;                  /* UTF8 flag */    BOOL   utf8;                  /* UTF8 flag */
610    BOOL   endonly;               /* Dollar not before final \n */    BOOL   endonly;               /* Dollar not before final \n */
611    BOOL   notempty;              /* Empty string match not wanted */    BOOL   notempty;              /* Empty string match not wanted */
612    const uschar *start_pattern;  /* For use when recursing */    const uschar *start_code;     /* For use when recursing */
613    const uschar *start_subject;  /* Start of the subject string */    const uschar *start_subject;  /* Start of the subject string */
614    const uschar *end_subject;    /* End of the subject string */    const uschar *end_subject;    /* End of the subject string */
615    const uschar *start_match;    /* Start of this match attempt */    const uschar *start_match;    /* Start of this match attempt */
616    const uschar *end_match_ptr;  /* Subject position at end match */    const uschar *end_match_ptr;  /* Subject position at end match */
617    int    end_offset_top;        /* Highwater mark at end of match */    int    end_offset_top;        /* Highwater mark at end of match */
618      int    capture_last;          /* Most recent capture number */
619      int    start_offset;          /* The start offset value */
620      recursion_info *recursive;    /* Linked list of recursion data */
621      void  *callout_data;          /* To pass back to callouts */
622  } match_data;  } match_data;
623    
624  /* Bit definitions for entries in the pcre_ctypes table. */  /* Bit definitions for entries in the pcre_ctypes table. */

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