/[pcre]/code/tags/pcre-4.3/internal.h
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revision 25 by nigel, Sat Feb 24 21:38:45 2007 UTC revision 65 by nigel, Sat Feb 24 21:40:08 2007 UTC
# Line 3  Line 3 
3  *************************************************/  *************************************************/
4    
5    
 #define PCRE_VERSION       "2.01 21-Oct-1998"  
   
   
6  /* This is a library of functions to support regular expressions whose syntax  /* This is a library of functions to support regular expressions whose syntax
7  and semantics are as close as possible to those of the Perl 5 language. See  and semantics are as close as possible to those of the Perl 5 language. See
8  the file Tech.Notes for some information on the internals.  the file Tech.Notes for some information on the internals.
9    
10  Written by: Philip Hazel <ph10@cam.ac.uk>  Written by: Philip Hazel <ph10@cam.ac.uk>
11    
12             Copyright (c) 1998 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 28  restrictions: Line 25  restrictions:
25    
26  3. Altered versions must be plainly marked as such, and must not be  3. Altered versions must be plainly marked as such, and must not be
27     misrepresented as being the original software.     misrepresented as being the original software.
28    
29    4. If PCRE is embedded in any software that is released under the GNU
30       General Purpose Licence (GPL), then the terms of that licence shall
31       supersede any condition above with which it is incompatible.
32  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
33  */  */
34    
35  /* This header contains definitions that are shared between the different  /* This header contains definitions that are shared between the different
36  modules, but which are not relevant to the outside. */  modules, but which are not relevant to the outside. */
37    
38    /* Get the definitions provided by running "configure" */
39    
40    #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 USE_BCOPY is defined. */  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  #ifdef USE_BCOPY  #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 50  define a macro for memmove() if USE_BCOP Line 159  define a macro for memmove() if USE_BCOP
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 63  Standard C system should have one. */ Line 177  Standard C system should have one. */
177    
178  #define PCRE_IMS (PCRE_CASELESS|PCRE_MULTILINE|PCRE_DOTALL)  #define PCRE_IMS (PCRE_CASELESS|PCRE_MULTILINE|PCRE_DOTALL)
179    
180  /* Private options flags start at the most significant end of the two bytes.  /* Private options flags start at the most significant end of the four bytes,
181  The public options defined in pcre.h start at the least significant end. Make  but skip the top bit so we can use ints for convenience without getting tangled
182  sure they don't overlap! */  with negative values. The public options defined in pcre.h start at the least
183    significant end. Make sure they don't overlap, though now that we have expanded
184  #define PCRE_FIRSTSET           0x8000  /* first_char is set */  to four bytes there is plenty of space. */
185  #define PCRE_STARTLINE          0x4000  /* start after \n for multiline */  
186  #define PCRE_INGROUP            0x2000  /* compiling inside a group */  #define PCRE_FIRSTSET      0x40000000  /* first_byte is set */
187    #define PCRE_REQCHSET      0x20000000  /* req_byte is set */
188    #define PCRE_STARTLINE     0x10000000  /* start after \n for multiline */
189    #define PCRE_ICHANGED      0x08000000  /* 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 80  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 (PCRE_ANCHORED|PCRE_NOTBOL|PCRE_NOTEOL)  #define PUBLIC_EXEC_OPTIONS \
204      (PCRE_ANCHORED|PCRE_NOTBOL|PCRE_NOTEOL|PCRE_NOTEMPTY)
205    
206  #define PUBLIC_STUDY_OPTIONS 0   /* None defined */  #define PUBLIC_STUDY_OPTIONS 0   /* None defined */
207    
208  /* Magic number to provide a small check against being handed junk. */  /* Magic number to provide a small check against being handed junk. */
209    
210  #define MAGIC_NUMBER  0x50435245   /* '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    
# Line 97  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    #ifndef ESC_t
251    #define ESC_t '\t'
252    #endif
253    
254  /* 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
255  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
256  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
257  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
258  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
259  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
260  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
261  that code will have to change. */  detect the types that may be repeated. These are the types that consume a
262    character. If any new escapes are put in between that don't consume a
263    character, that code will have to change. */
264    
265    enum { ESC_A = 1, ESC_G, ESC_B, ESC_b, ESC_D, ESC_d, ESC_S, ESC_s, ESC_W,
266           ESC_w, ESC_dum1, ESC_C, ESC_Z, ESC_z, ESC_E, ESC_Q, ESC_REF };
267    
268    /* Flag bits and data types for the extended class (OP_XCLASS) for classes that
269    contain UTF-8 characters with values greater than 255. */
270    
271    #define XCL_NOT    0x01    /* Flag: this is a negative class */
272    #define XCL_MAP    0x02    /* Flag: a 32-byte map is present */
273    
274    #define XCL_END       0    /* Marks end of individual items */
275    #define XCL_SINGLE    1    /* Single item (one multibyte char) follows */
276    #define XCL_RANGE     2    /* A range (two multibyte chars) follows */
277    
 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 };  
278    
279  /* 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
280  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
281  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.
282    Note that whenever this list is updated, the two macro definitions that follow
283    must also be updated to match. */
284    
285  enum {  enum {
286    OP_END,            /* End of pattern */    OP_END,            /* 0 End of pattern */
287    
288    /* Values corresponding to backslashed metacharacters */    /* Values corresponding to backslashed metacharacters */
289    
290    OP_SOD,            /* Start of data: \A */    OP_SOD,            /* 1 Start of data: \A */
291    OP_NOT_WORD_BOUNDARY,  /* \B */    OP_SOM,            /* 2 Start of match (subject + offset): \G */
292    OP_WORD_BOUNDARY,      /* \b */    OP_NOT_WORD_BOUNDARY,  /*  3 \B */
293    OP_NOT_DIGIT,          /* \D */    OP_WORD_BOUNDARY,      /*  4 \b */
294    OP_DIGIT,              /* \d */    OP_NOT_DIGIT,          /*  5 \D */
295    OP_NOT_WHITESPACE,     /* \S */    OP_DIGIT,              /*  6 \d */
296    OP_WHITESPACE,         /* \s */    OP_NOT_WHITESPACE,     /*  7 \S */
297    OP_NOT_WORDCHAR,       /* \W */    OP_WHITESPACE,         /*  8 \s */
298    OP_WORDCHAR,           /* \w */    OP_NOT_WORDCHAR,       /*  9 \W */
299    OP_EODN,           /* End of data or \n at end of data: \Z. */    OP_WORDCHAR,           /* 10 \w */
300    OP_EOD,            /* End of data: \z */    OP_ANY,            /* 11 Match any character */
301      OP_ANYBYTE,        /* 12 Match any byte (\C); different to OP_ANY for UTF-8 */
302    OP_OPT,            /* Set runtime options */    OP_EODN,           /* 13 End of data or \n at end of data: \Z. */
303    OP_CIRC,           /* Start of line - varies with multiline switch */    OP_EOD,            /* 14 End of data: \z */
304    OP_DOLL,           /* End of line - varies with multiline switch */  
305    OP_ANY,            /* Match any character */    OP_OPT,            /* 15 Set runtime options */
306    OP_CHARS,          /* Match string of characters */    OP_CIRC,           /* 16 Start of line - varies with multiline switch */
307    OP_NOT,            /* Match anything but the following char */    OP_DOLL,           /* 17 End of line - varies with multiline switch */
308      OP_CHARS,          /* 18 Match string of characters */
309    OP_STAR,           /* The maximizing and minimizing versions of */    OP_NOT,            /* 19 Match anything but the following char */
310    OP_MINSTAR,        /* all these opcodes must come in pairs, with */  
311    OP_PLUS,           /* the minimizing one second. */    OP_STAR,           /* 20 The maximizing and minimizing versions of */
312    OP_MINPLUS,        /* This first set applies to single characters */    OP_MINSTAR,        /* 21 all these opcodes must come in pairs, with */
313    OP_QUERY,    OP_PLUS,           /* 22 the minimizing one second. */
314    OP_MINQUERY,    OP_MINPLUS,        /* 23 This first set applies to single characters */
315    OP_UPTO,           /* From 0 to n matches */    OP_QUERY,          /* 24 */
316    OP_MINUPTO,    OP_MINQUERY,       /* 25 */
317    OP_EXACT,          /* Exactly n matches */    OP_UPTO,           /* 26 From 0 to n matches */
318      OP_MINUPTO,        /* 27 */
319    OP_NOTSTAR,        /* The maximizing and minimizing versions of */    OP_EXACT,          /* 28 Exactly n matches */
320    OP_NOTMINSTAR,     /* all these opcodes must come in pairs, with */  
321    OP_NOTPLUS,        /* the minimizing one second. */    OP_NOTSTAR,        /* 29 The maximizing and minimizing versions of */
322    OP_NOTMINPLUS,     /* This first set applies to "not" single characters */    OP_NOTMINSTAR,     /* 30 all these opcodes must come in pairs, with */
323    OP_NOTQUERY,    OP_NOTPLUS,        /* 31 the minimizing one second. */
324    OP_NOTMINQUERY,    OP_NOTMINPLUS,     /* 32 This set applies to "not" single characters */
325    OP_NOTUPTO,        /* From 0 to n matches */    OP_NOTQUERY,       /* 33 */
326    OP_NOTMINUPTO,    OP_NOTMINQUERY,    /* 34 */
327    OP_NOTEXACT,       /* Exactly n matches */    OP_NOTUPTO,        /* 35 From 0 to n matches */
328      OP_NOTMINUPTO,     /* 36 */
329    OP_TYPESTAR,       /* The maximizing and minimizing versions of */    OP_NOTEXACT,       /* 37 Exactly n matches */
330    OP_TYPEMINSTAR,    /* all these opcodes must come in pairs, with */  
331    OP_TYPEPLUS,       /* the minimizing one second. These codes must */    OP_TYPESTAR,       /* 38 The maximizing and minimizing versions of */
332    OP_TYPEMINPLUS,    /* be in exactly the same order as those above. */    OP_TYPEMINSTAR,    /* 39 all these opcodes must come in pairs, with */
333    OP_TYPEQUERY,      /* This set applies to character types such as \d */    OP_TYPEPLUS,       /* 40 the minimizing one second. These codes must */
334    OP_TYPEMINQUERY,    OP_TYPEMINPLUS,    /* 41 be in exactly the same order as those above. */
335    OP_TYPEUPTO,       /* From 0 to n matches */    OP_TYPEQUERY,      /* 42 This set applies to character types such as \d */
336    OP_TYPEMINUPTO,    OP_TYPEMINQUERY,   /* 43 */
337    OP_TYPEEXACT,      /* Exactly n matches */    OP_TYPEUPTO,       /* 44 From 0 to n matches */
338      OP_TYPEMINUPTO,    /* 45 */
339    OP_CRSTAR,         /* The maximizing and minimizing versions of */    OP_TYPEEXACT,      /* 46 Exactly n matches */
340    OP_CRMINSTAR,      /* all these opcodes must come in pairs, with */  
341    OP_CRPLUS,         /* the minimizing one second. These codes must */    OP_CRSTAR,         /* 47 The maximizing and minimizing versions of */
342    OP_CRMINPLUS,      /* be in exactly the same order as those above. */    OP_CRMINSTAR,      /* 48 all these opcodes must come in pairs, with */
343    OP_CRQUERY,        /* These are for character classes and back refs */    OP_CRPLUS,         /* 49 the minimizing one second. These codes must */
344    OP_CRMINQUERY,    OP_CRMINPLUS,      /* 50 be in exactly the same order as those above. */
345    OP_CRRANGE,        /* These are different to the three seta above. */    OP_CRQUERY,        /* 51 These are for character classes and back refs */
346    OP_CRMINRANGE,    OP_CRMINQUERY,     /* 52 */
347      OP_CRRANGE,        /* 53 These are different to the three seta above. */
348    OP_CLASS,          /* Match a character class */    OP_CRMINRANGE,     /* 54 */
349    OP_REF,            /* Match a back reference */  
350      OP_CLASS,          /* 55 Match a character class, chars < 256 only */
351    OP_ALT,            /* Start of alternation */    OP_NCLASS,         /* 56 Same, but the bitmap was created from a negative
352    OP_KET,            /* End of group that doesn't have an unbounded repeat */                             class - the difference is relevant only when a UTF-8
353    OP_KETRMAX,        /* These two must remain together and in this */                             character > 255 is encountered. */
354    OP_KETRMIN,        /* order. They are for groups the repeat for ever. */  
355      OP_XCLASS,         /* 56 Extended class for handling UTF-8 chars within the
356                               class. This does both positive and negative. */
357    
358      OP_REF,            /* 57 Match a back reference */
359      OP_RECURSE,        /* 58 Match a numbered subpattern (possibly recursive) */
360      OP_CALLOUT,        /* 59 Call out to external function if provided */
361    
362      OP_ALT,            /* 60 Start of alternation */
363      OP_KET,            /* 61 End of group that doesn't have an unbounded repeat */
364      OP_KETRMAX,        /* 62 These two must remain together and in this */
365      OP_KETRMIN,        /* 63 order. They are for groups the repeat for ever. */
366    
367    /* The assertions must come before ONCE and COND */    /* The assertions must come before ONCE and COND */
368    
369    OP_ASSERT,         /* Positive lookahead */    OP_ASSERT,         /* 64 Positive lookahead */
370    OP_ASSERT_NOT,     /* Negative lookahead */    OP_ASSERT_NOT,     /* 65 Negative lookahead */
371    OP_ASSERTBACK,     /* Positive lookbehind */    OP_ASSERTBACK,     /* 66 Positive lookbehind */
372    OP_ASSERTBACK_NOT, /* Negative lookbehind */    OP_ASSERTBACK_NOT, /* 67 Negative lookbehind */
373    OP_REVERSE,        /* Move pointer back - used in lookbehind assertions */    OP_REVERSE,        /* 68 Move pointer back - used in lookbehind assertions */
374    
375    /* 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
376    a test for >= ONCE for a subpattern that isn't an assertion. */    a test for >= ONCE for a subpattern that isn't an assertion. */
377    
378    OP_ONCE,           /* Once matched, don't back up into the subpattern */    OP_ONCE,           /* 69 Once matched, don't back up into the subpattern */
379    OP_COND,           /* Conditional group */    OP_COND,           /* 70 Conditional group */
380    OP_CREF,           /* Used to hold an extraction string number */    OP_CREF,           /* 71 Used to hold an extraction string number (cond ref) */
381    
382      OP_BRAZERO,        /* 72 These two must remain together and in this */
383      OP_BRAMINZERO,     /* 73 order. */
384    
385      OP_BRANUMBER,      /* 74 Used for extracting brackets whose number is greater
386                               than can fit into an opcode. */
387    
388      OP_BRA             /* 75 This and greater values are used for brackets that
389                               extract substrings up to a basic limit. After that,
390                               use is made of OP_BRANUMBER. */
391    };
392    
393    OP_BRAZERO,        /* These two must remain together and in this */  /* WARNING: There is an implicit assumption in study.c that all opcodes are
394    OP_BRAMINZERO,     /* order. */  less than 128 in value. This makes handling UTF-8 character sequences easier.
395    */
396    
   OP_BRA             /* This and greater values are used for brackets that  
                         extract substrings. */  
 };  
397    
398  /* The highest extraction number. This is limited by the number of opcodes  /* This macro defines textual names for all the opcodes. There are used only
399  left after OP_BRA, i.e. 255 - OP_BRA. We actually set it somewhat lower. */  for debugging, in pcre.c when DEBUG is defined, and also in pcretest.c. The
400    macro is referenced only in printint.c. */
401    
402    #define OP_NAME_LIST \
403      "End", "\\A", "\\G", "\\B", "\\b", "\\D", "\\d",                \
404      "\\S", "\\s", "\\W", "\\w", "Any", "Anybyte", "\\Z", "\\z",     \
405      "Opt", "^", "$", "chars", "not",                                \
406      "*", "*?", "+", "+?", "?", "??", "{", "{", "{",                 \
407      "*", "*?", "+", "+?", "?", "??", "{", "{", "{",                 \
408      "*", "*?", "+", "+?", "?", "??", "{", "{", "{",                 \
409      "*", "*?", "+", "+?", "?", "??", "{", "{",                      \
410      "class", "nclass", "xclass", "Ref", "Recurse", "Callout",       \
411      "Alt", "Ket", "KetRmax", "KetRmin", "Assert", "Assert not",     \
412      "AssertB", "AssertB not", "Reverse", "Once", "Cond", "Cond ref",\
413      "Brazero", "Braminzero", "Branumber", "Bra"
414    
415    
416    /* This macro defines the length of fixed length operations in the compiled
417    regex. The lengths are used when searching for specific things, and also in the
418    debugging printing of a compiled regex. We use a macro so that it can be
419    incorporated both into pcre.c and pcretest.c without being publicly exposed.
420    
421    As things have been extended, some of these are no longer fixed lenths, but are
422    minima instead. For example, the length of a single-character repeat may vary
423    in UTF-8 mode. The code that uses this table must know about such things. */
424    
425    #define OP_LENGTHS \
426      1,                             /* End                                    */ \
427      1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  /* \A, \G, \B, \B, \D, \d, \S, \s, \W, \w */ \
428      1, 1, 1, 1, 2, 1, 1,           /* Any, Anybyte, \Z, \z, Opt, ^, $        */ \
429      2,                             /* Chars - the minimum length             */ \
430      2,                             /* not                                    */ \
431      /* Positive single-char repeats                                          */ \
432      2, 2, 2, 2, 2, 2,              /* *, *?, +, +?, ?, ??      ** These are  */ \
433      4, 4, 4,                       /* upto, minupto, exact     ** minima     */ \
434      /* Negative single-char repeats                                          */ \
435      2, 2, 2, 2, 2, 2,              /* NOT *, *?, +, +?, ?, ??                */ \
436      4, 4, 4,                       /* NOT upto, minupto, exact               */ \
437      /* Positive type repeats                                                 */ \
438      2, 2, 2, 2, 2, 2,              /* Type *, *?, +, +?, ?, ??               */ \
439      4, 4, 4,                       /* Type upto, minupto, exact              */ \
440      /* Character class & ref repeats                                         */ \
441      1, 1, 1, 1, 1, 1,              /* *, *?, +, +?, ?, ??                    */ \
442      5, 5,                          /* CRRANGE, CRMINRANGE                    */ \
443     33,                             /* CLASS                                  */ \
444     33,                             /* NCLASS                                 */ \
445      0,                             /* XCLASS - variable length               */ \
446      3,                             /* REF                                    */ \
447      1+LINK_SIZE,                   /* RECURSE                                */ \
448      2,                             /* CALLOUT                                */ \
449      1+LINK_SIZE,                   /* Alt                                    */ \
450      1+LINK_SIZE,                   /* Ket                                    */ \
451      1+LINK_SIZE,                   /* KetRmax                                */ \
452      1+LINK_SIZE,                   /* KetRmin                                */ \
453      1+LINK_SIZE,                   /* Assert                                 */ \
454      1+LINK_SIZE,                   /* Assert not                             */ \
455      1+LINK_SIZE,                   /* Assert behind                          */ \
456      1+LINK_SIZE,                   /* Assert behind not                      */ \
457      1+LINK_SIZE,                   /* Reverse                                */ \
458      1+LINK_SIZE,                   /* Once                                   */ \
459      1+LINK_SIZE,                   /* COND                                   */ \
460      3,                             /* CREF                                   */ \
461      1, 1,                          /* BRAZERO, BRAMINZERO                    */ \
462      3,                             /* BRANUMBER                              */ \
463      1+LINK_SIZE                    /* BRA                                    */ \
464    
465    
466    /* The highest extraction number before we have to start using additional
467    bytes. (Originally PCRE didn't have support for extraction counts highter than
468    this number.) The value is limited by the number of opcodes left after OP_BRA,
469    i.e. 255 - OP_BRA. We actually set it a bit lower to leave room for additional
470    opcodes. */
471    
472    #define EXTRACT_BASIC_MAX  150
473    
474    /* A magic value for OP_CREF to indicate the "in recursion" condition. */
475    
476  #define EXTRACT_MAX  99  #define CREF_RECURSE  0xffff
477    
478  /* 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
479  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 228  just to accommodate the POSIX wrapper. * Line 492  just to accommodate the POSIX wrapper. *
492  #define ERR10 "operand of unlimited repeat could match the empty string"  #define ERR10 "operand of unlimited repeat could match the empty string"
493  #define ERR11 "internal error: unexpected repeat"  #define ERR11 "internal error: unexpected repeat"
494  #define ERR12 "unrecognized character after (?"  #define ERR12 "unrecognized character after (?"
495  #define ERR13 "too many capturing parenthesized sub-patterns"  #define ERR13 "POSIX named classes are supported only within a class"
496  #define ERR14 "missing )"  #define ERR14 "missing )"
497  #define ERR15 "back reference to non-existent subpattern"  #define ERR15 "reference to non-existent subpattern"
498  #define ERR16 "erroffset passed as NULL"  #define ERR16 "erroffset passed as NULL"
499  #define ERR17 "unknown option bit(s) set"  #define ERR17 "unknown option bit(s) set"
500  #define ERR18 "missing ) after comment"  #define ERR18 "missing ) after comment"
501  #define ERR19 "too many sets of parentheses"  #define ERR19 "parentheses nested too deeply"
502  #define ERR20 "regular expression too large"  #define ERR20 "regular expression too large"
503  #define ERR21 "failed to get memory"  #define ERR21 "failed to get memory"
504  #define ERR22 "unmatched parentheses"  #define ERR22 "unmatched parentheses"
# Line 244  just to accommodate the POSIX wrapper. * Line 508  just to accommodate the POSIX wrapper. *
508  #define ERR26 "malformed number after (?("  #define ERR26 "malformed number after (?("
509  #define ERR27 "conditional group contains more than two branches"  #define ERR27 "conditional group contains more than two branches"
510  #define ERR28 "assertion expected after (?("  #define ERR28 "assertion expected after (?("
511    #define ERR29 "(?R or (?digits must be followed by )"
512    #define ERR30 "unknown POSIX class name"
513    #define ERR31 "POSIX collating elements are not supported"
514    #define ERR32 "this version of PCRE is not compiled with PCRE_UTF8 support"
515    #define ERR33 "spare error"
516    #define ERR34 "character value in \\x{...} sequence is too large"
517    #define ERR35 "invalid condition (?(0)"
518    #define ERR36 "\\C not allowed in lookbehind assertion"
519    #define ERR37 "PCRE does not support \\L, \\l, \\N, \\P, \\p, \\U, \\u, or \\X"
520    #define ERR38 "number after (?C is > 255"
521    #define ERR39 "closing ) for (?C expected"
522    #define ERR40 "recursive call could loop indefinitely"
523    #define ERR41 "unrecognized character after (?P"
524    #define ERR42 "syntax error after (?P"
525    #define ERR43 "two named groups have the same name"
526    
527  /* All character handling must be done as unsigned characters. Otherwise there  /* All character handling must be done as unsigned characters. Otherwise there
528  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 254  Unix, where it is defined in sys/types, Line 533  Unix, where it is defined in sys/types,
533    
534  typedef unsigned char uschar;  typedef unsigned char uschar;
535    
536  /* 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
537  runs on as long as necessary after the end. */  code vector run on as long as necessary after the end. */
538    
539  typedef struct real_pcre {  typedef struct real_pcre {
540    unsigned int  magic_number;    unsigned long int magic_number;
541    const unsigned char *tables;    size_t size;                        /* Total that was malloced */
542    unsigned short int options;    const unsigned char *tables;        /* Pointer to tables */
543    unsigned char top_bracket;    unsigned long int options;
544    unsigned char top_backref;    unsigned short int top_bracket;
545    unsigned char first_char;    unsigned short int top_backref;
546    unsigned char code[1];    unsigned short int first_byte;
547      unsigned short int req_byte;
548      unsigned short int name_entry_size; /* Size of any name items; 0 => none */
549      unsigned short int name_count;      /* Number of name items */
550  } real_pcre;  } real_pcre;
551    
552  /* The real format of the extra block returned by pcre_study(). */  /* The format of the block used to store data from pcre_study(). */
   
 typedef struct real_pcre_extra {  
   unsigned char options;  
   unsigned char start_bits[32];  
 } real_pcre_extra;  
553    
554    typedef struct pcre_study_data {
555      size_t size;                        /* Total that was malloced */
556      uschar options;
557      uschar start_bits[32];
558    } pcre_study_data;
559    
560  /* Structure for passing "static" information around between the functions  /* Structure for passing "static" information around between the functions
561  doing the compiling, so that they are thread-safe. */  doing the compiling, so that they are thread-safe. */
562    
563  typedef struct compile_data {  typedef struct compile_data {
564    const uschar *lcc;            /* Points to lower casing table */    const uschar *lcc;            /* Points to lower casing table */
565    const uschar *fcc;            /* Points to case-flippint table */    const uschar *fcc;            /* Points to case-flipping table */
566    const uschar *cbits;          /* Points to character type table */    const uschar *cbits;          /* Points to character type table */
567    const uschar *ctypes;         /* Points to table of type maps */    const uschar *ctypes;         /* Points to table of type maps */
568      const uschar *start_code;     /* The start of the compiled code */
569      uschar *name_table;           /* The name/number table */
570      int  names_found;             /* Number of entries so far */
571      int  name_entry_size;         /* Size of each entry */
572      int  top_backref;             /* Maximum back reference */
573      unsigned int backref_map;     /* Bitmap of low back refs */
574      int  req_varyopt;             /* "After variable item" flag for reqbyte */
575  } compile_data;  } compile_data;
576    
577    /* Structure for maintaining a chain of pointers to the currently incomplete
578    branches, for testing for left recursion. */
579    
580    typedef struct branch_chain {
581      struct branch_chain *outer;
582      uschar *current;
583    } branch_chain;
584    
585    /* Structure for items in a linked list that represents an explicit recursive
586    call within the pattern. */
587    
588    typedef struct recursion_info {
589      struct recursion_info *prev;  /* Previous recursion record (or NULL) */
590      int group_num;                /* Number of group that was called */
591      const uschar *after_call;     /* "Return value": points after the call in the expr */
592      const uschar *save_start;     /* Old value of md->start_match */
593      int *offset_save;             /* Pointer to start of saved offsets */
594      int saved_max;                /* Number of saved offsets */
595    } recursion_info;
596    
597  /* Structure for passing "static" information around between the functions  /* Structure for passing "static" information around between the functions
598  doing the matching, so that they are thread-safe. */  doing the matching, so that they are thread-safe. */
599    
600  typedef struct match_data {  typedef struct match_data {
601    int    errorcode;             /* As it says */    int    match_call_count;      /* As it says */
602      unsigned long int match_limit;/* As it says */
603    int   *offset_vector;         /* Offset vector */    int   *offset_vector;         /* Offset vector */
604    int    offset_end;            /* One past the end */    int    offset_end;            /* One past the end */
605    int    offset_max;            /* The maximum usable for return data */    int    offset_max;            /* The maximum usable for return data */
# Line 298  typedef struct match_data { Line 608  typedef struct match_data {
608    BOOL   offset_overflow;       /* Set if too many extractions */    BOOL   offset_overflow;       /* Set if too many extractions */
609    BOOL   notbol;                /* NOTBOL flag */    BOOL   notbol;                /* NOTBOL flag */
610    BOOL   noteol;                /* NOTEOL flag */    BOOL   noteol;                /* NOTEOL flag */
611      BOOL   utf8;                  /* UTF8 flag */
612    BOOL   endonly;               /* Dollar not before final \n */    BOOL   endonly;               /* Dollar not before final \n */
613      BOOL   notempty;              /* Empty string match not wanted */
614      const uschar *start_code;     /* For use when recursing */
615    const uschar *start_subject;  /* Start of the subject string */    const uschar *start_subject;  /* Start of the subject string */
616    const uschar *end_subject;    /* End of the subject string */    const uschar *end_subject;    /* End of the subject string */
617      const uschar *start_match;    /* Start of this match attempt */
618    const uschar *end_match_ptr;  /* Subject position at end match */    const uschar *end_match_ptr;  /* Subject position at end match */
619    int     end_offset_top;       /* Highwater mark at end of match */    int    end_offset_top;        /* Highwater mark at end of match */
620      int    capture_last;          /* Most recent capture number */
621      int    start_offset;          /* The start offset value */
622      recursion_info *recursive;    /* Linked list of recursion data */
623      void  *callout_data;          /* To pass back to callouts */
624  } match_data;  } match_data;
625    
626  /* Bit definitions for entries in the pcre_ctypes table. */  /* Bit definitions for entries in the pcre_ctypes table. */
# Line 315  typedef struct match_data { Line 633  typedef struct match_data {
633  #define ctype_meta    0x80   /* regexp meta char or zero (end pattern) */  #define ctype_meta    0x80   /* regexp meta char or zero (end pattern) */
634    
635  /* Offsets for the bitmap tables in pcre_cbits. Each table contains a set  /* Offsets for the bitmap tables in pcre_cbits. Each table contains a set
636  of bits for a class map. */  of bits for a class map. Some classes are built by combining these tables. */
637    
638  #define cbit_digit    0      /* for \d */  #define cbit_space     0      /* [:space:] or \s */
639  #define cbit_word    32      /* for \w */  #define cbit_xdigit   32      /* [:xdigit:] */
640  #define cbit_space   64      /* for \s */  #define cbit_digit    64      /* [:digit:] or \d */
641  #define cbit_length  96      /* Length of the cbits table */  #define cbit_upper    96      /* [:upper:] */
642    #define cbit_lower   128      /* [:lower:] */
643    #define cbit_word    160      /* [:word:] or \w */
644    #define cbit_graph   192      /* [:graph:] */
645    #define cbit_print   224      /* [:print:] */
646    #define cbit_punct   256      /* [:punct:] */
647    #define cbit_cntrl   288      /* [:cntrl:] */
648    #define cbit_length  320      /* Length of the cbits table */
649    
650  /* Offsets of the various tables from the base tables pointer, and  /* Offsets of the various tables from the base tables pointer, and
651  total length. */  total length. */
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