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Do not discard subpatterns with {0} quantifiers, as they may be called as 
subroutines.

1 nigel 77 /*************************************************
2     * Perl-Compatible Regular Expressions *
3     *************************************************/
4    
5    
6     /* PCRE 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.
8    
9     Written by Philip Hazel
10 ph10 305 Copyright (c) 1997-2008 University of Cambridge
11 nigel 77
12     -----------------------------------------------------------------------------
13     Redistribution and use in source and binary forms, with or without
14     modification, are permitted provided that the following conditions are met:
15    
16     * Redistributions of source code must retain the above copyright notice,
17     this list of conditions and the following disclaimer.
18    
19     * Redistributions in binary form must reproduce the above copyright
20     notice, this list of conditions and the following disclaimer in the
21     documentation and/or other materials provided with the distribution.
22    
23     * Neither the name of the University of Cambridge nor the names of its
24     contributors may be used to endorse or promote products derived from
25     this software without specific prior written permission.
26    
27     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
28     AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29     IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30     ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
31     LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37     POSSIBILITY OF SUCH DAMAGE.
38     -----------------------------------------------------------------------------
39     */
40    
41     /* This header contains definitions that are shared between the different
42     modules, but which are not relevant to the exported API. This includes some
43     functions whose names all begin with "_pcre_". */
44    
45 nigel 85 #ifndef PCRE_INTERNAL_H
46     #define PCRE_INTERNAL_H
47 nigel 77
48     /* Define DEBUG to get debugging output on stdout. */
49    
50 nigel 85 #if 0
51 nigel 77 #define DEBUG
52 nigel 85 #endif
53 nigel 77
54     /* Use a macro for debugging printing, 'cause that eliminates the use of #ifdef
55     inline, and there are *still* stupid compilers about that don't like indented
56     pre-processor statements, or at least there were when I first wrote this. After
57 nigel 93 all, it had only been about 10 years then...
58 nigel 77
59 nigel 93 It turns out that the Mac Debugging.h header also defines the macro DPRINTF, so
60     be absolutely sure we get our version. */
61    
62     #undef DPRINTF
63 nigel 77 #ifdef DEBUG
64     #define DPRINTF(p) printf p
65     #else
66 nigel 93 #define DPRINTF(p) /* Nothing */
67 nigel 77 #endif
68    
69    
70     /* Standard C headers plus the external interface definition. The only time
71     setjmp and stdarg are used is when NO_RECURSE is set. */
72    
73     #include <ctype.h>
74     #include <limits.h>
75     #include <setjmp.h>
76     #include <stdarg.h>
77     #include <stddef.h>
78     #include <stdio.h>
79     #include <stdlib.h>
80     #include <string.h>
81    
82 ph10 145 /* When compiling a DLL for Windows, the exported symbols have to be declared
83     using some MS magic. I found some useful information on this web page:
84     http://msdn2.microsoft.com/en-us/library/y4h7bcy6(VS.80).aspx. According to the
85 ph10 154 information there, using __declspec(dllexport) without "extern" we have a
86 ph10 145 definition; with "extern" we have a declaration. The settings here override the
87     setting in pcre.h (which is included below); it defines only PCRE_EXP_DECL,
88 ph10 154 which is all that is needed for applications (they just import the symbols). We
89     use:
90 ph10 145
91     PCRE_EXP_DECL for declarations
92     PCRE_EXP_DEFN for definitions of exported functions
93     PCRE_EXP_DATA_DEFN for definitions of exported variables
94    
95     The reason for the two DEFN macros is that in non-Windows environments, one
96     does not want to have "extern" before variable definitions because it leads to
97     compiler warnings. So we distinguish between functions and variables. In
98     Windows, the two should always be the same.
99    
100     The reason for wrapping this in #ifndef PCRE_EXP_DECL is so that pcretest,
101     which is an application, but needs to import this file in order to "peek" at
102 ph10 154 internals, can #include pcre.h first to get an application's-eye view.
103 ph10 145
104     In principle, people compiling for non-Windows, non-Unix-like (i.e. uncommon,
105     special-purpose environments) might want to stick other stuff in front of
106     exported symbols. That's why, in the non-Windows case, we set PCRE_EXP_DEFN and
107     PCRE_EXP_DATA_DEFN only if they are not already set. */
108    
109     #ifndef PCRE_EXP_DECL
110     # ifdef _WIN32
111 ph10 199 # ifndef PCRE_STATIC
112 ph10 145 # define PCRE_EXP_DECL extern __declspec(dllexport)
113     # define PCRE_EXP_DEFN __declspec(dllexport)
114     # define PCRE_EXP_DATA_DEFN __declspec(dllexport)
115     # else
116     # define PCRE_EXP_DECL extern
117     # define PCRE_EXP_DEFN
118     # define PCRE_EXP_DATA_DEFN
119     # endif
120     # else
121     # ifdef __cplusplus
122     # define PCRE_EXP_DECL extern "C"
123     # else
124     # define PCRE_EXP_DECL extern
125     # endif
126     # ifndef PCRE_EXP_DEFN
127     # define PCRE_EXP_DEFN PCRE_EXP_DECL
128     # endif
129     # ifndef PCRE_EXP_DATA_DEFN
130     # define PCRE_EXP_DATA_DEFN
131     # endif
132     # endif
133 nigel 77 #endif
134    
135     /* We need to have types that specify unsigned 16-bit and 32-bit integers. We
136     cannot determine these outside the compilation (e.g. by running a program as
137     part of "configure") because PCRE is often cross-compiled for use on other
138     systems. Instead we make use of the maximum sizes that are available at
139     preprocessor time in standard C environments. */
140    
141     #if USHRT_MAX == 65535
142     typedef unsigned short pcre_uint16;
143     #elif UINT_MAX == 65535
144     typedef unsigned int pcre_uint16;
145     #else
146     #error Cannot determine a type for 16-bit unsigned integers
147     #endif
148    
149     #if UINT_MAX == 4294967295
150     typedef unsigned int pcre_uint32;
151     #elif ULONG_MAX == 4294967295
152     typedef unsigned long int pcre_uint32;
153     #else
154     #error Cannot determine a type for 32-bit unsigned integers
155     #endif
156    
157     /* All character handling must be done as unsigned characters. Otherwise there
158     are problems with top-bit-set characters and functions such as isspace().
159     However, we leave the interface to the outside world as char *, because that
160     should make things easier for callers. We define a short type for unsigned char
161     to save lots of typing. I tried "uchar", but it causes problems on Digital
162     Unix, where it is defined in sys/types, so use "uschar" instead. */
163    
164     typedef unsigned char uschar;
165    
166 nigel 93 /* This is an unsigned int value that no character can ever have. UTF-8
167     characters only go up to 0x7fffffff (though Unicode doesn't go beyond
168     0x0010ffff). */
169 nigel 91
170 nigel 93 #define NOTACHAR 0xffffffff
171    
172     /* PCRE is able to support several different kinds of newline (CR, LF, CRLF,
173 ph10 149 "any" and "anycrlf" at present). The following macros are used to package up
174     testing for newlines. NLBLOCK, PSSTART, and PSEND are defined in the various
175     modules to indicate in which datablock the parameters exist, and what the
176     start/end of string field names are. */
177 nigel 93
178 ph10 149 #define NLTYPE_FIXED 0 /* Newline is a fixed length string */
179     #define NLTYPE_ANY 1 /* Newline is any Unicode line ending */
180     #define NLTYPE_ANYCRLF 2 /* Newline is CR, LF, or CRLF */
181 nigel 93
182     /* This macro checks for a newline at the given position */
183    
184 nigel 91 #define IS_NEWLINE(p) \
185 nigel 93 ((NLBLOCK->nltype != NLTYPE_FIXED)? \
186     ((p) < NLBLOCK->PSEND && \
187 ph10 149 _pcre_is_newline((p), NLBLOCK->nltype, NLBLOCK->PSEND, &(NLBLOCK->nllen),\
188     utf8)) \
189 nigel 93 : \
190     ((p) <= NLBLOCK->PSEND - NLBLOCK->nllen && \
191     (p)[0] == NLBLOCK->nl[0] && \
192     (NLBLOCK->nllen == 1 || (p)[1] == NLBLOCK->nl[1]) \
193     ) \
194     )
195 nigel 91
196 nigel 93 /* This macro checks for a newline immediately preceding the given position */
197    
198     #define WAS_NEWLINE(p) \
199     ((NLBLOCK->nltype != NLTYPE_FIXED)? \
200     ((p) > NLBLOCK->PSSTART && \
201 ph10 149 _pcre_was_newline((p), NLBLOCK->nltype, NLBLOCK->PSSTART, \
202     &(NLBLOCK->nllen), utf8)) \
203 nigel 93 : \
204     ((p) >= NLBLOCK->PSSTART + NLBLOCK->nllen && \
205     (p)[-NLBLOCK->nllen] == NLBLOCK->nl[0] && \
206     (NLBLOCK->nllen == 1 || (p)[-NLBLOCK->nllen+1] == NLBLOCK->nl[1]) \
207     ) \
208     )
209    
210 nigel 87 /* When PCRE is compiled as a C++ library, the subject pointer can be replaced
211     with a custom type. This makes it possible, for example, to allow pcre_exec()
212     to process subject strings that are discontinuous by using a smart pointer
213     class. It must always be possible to inspect all of the subject string in
214     pcre_exec() because of the way it backtracks. Two macros are required in the
215     normal case, for sign-unspecified and unsigned char pointers. The former is
216     used for the external interface and appears in pcre.h, which is why its name
217     must begin with PCRE_. */
218    
219     #ifdef CUSTOM_SUBJECT_PTR
220     #define PCRE_SPTR CUSTOM_SUBJECT_PTR
221     #define USPTR CUSTOM_SUBJECT_PTR
222     #else
223     #define PCRE_SPTR const char *
224     #define USPTR const unsigned char *
225     #endif
226    
227 ph10 145
228    
229 nigel 85 /* Include the public PCRE header and the definitions of UCP character property
230     values. */
231 nigel 77
232 ph10 189 #include "pcre.h"
233 nigel 77 #include "ucp.h"
234    
235     /* When compiling for use with the Virtual Pascal compiler, these functions
236     need to have their names changed. PCRE must be compiled with the -DVPCOMPAT
237     option on the command line. */
238    
239     #ifdef VPCOMPAT
240 ph10 101 #define strlen(s) _strlen(s)
241 nigel 77 #define strncmp(s1,s2,m) _strncmp(s1,s2,m)
242 ph10 101 #define memcmp(s,c,n) _memcmp(s,c,n)
243 nigel 77 #define memcpy(d,s,n) _memcpy(d,s,n)
244     #define memmove(d,s,n) _memmove(d,s,n)
245     #define memset(s,c,n) _memset(s,c,n)
246     #else /* VPCOMPAT */
247    
248     /* To cope with SunOS4 and other systems that lack memmove() but have bcopy(),
249     define a macro for memmove() if HAVE_MEMMOVE is false, provided that HAVE_BCOPY
250     is set. Otherwise, include an emulating function for those systems that have
251 ph10 118 neither (there some non-Unix environments where this is the case). */
252 nigel 77
253 ph10 137 #ifndef HAVE_MEMMOVE
254 nigel 77 #undef memmove /* some systems may have a macro */
255 ph10 137 #ifdef HAVE_BCOPY
256 nigel 77 #define memmove(a, b, c) bcopy(b, a, c)
257     #else /* HAVE_BCOPY */
258 nigel 91 static void *
259 ph10 108 pcre_memmove(void *d, const void *s, size_t n)
260 nigel 77 {
261 nigel 87 size_t i;
262 ph10 108 unsigned char *dest = (unsigned char *)d;
263     const unsigned char *src = (const unsigned char *)s;
264 ph10 118 if (dest > src)
265     {
266     dest += n;
267     src += n;
268     for (i = 0; i < n; ++i) *(--dest) = *(--src);
269     return (void *)dest;
270     }
271     else
272     {
273     for (i = 0; i < n; ++i) *dest++ = *src++;
274 ph10 123 return (void *)(dest - n);
275     }
276 nigel 77 }
277     #define memmove(a, b, c) pcre_memmove(a, b, c)
278     #endif /* not HAVE_BCOPY */
279     #endif /* not HAVE_MEMMOVE */
280     #endif /* not VPCOMPAT */
281    
282    
283     /* PCRE keeps offsets in its compiled code as 2-byte quantities (always stored
284     in big-endian order) by default. These are used, for example, to link from the
285     start of a subpattern to its alternatives and its end. The use of 2 bytes per
286     offset limits the size of the compiled regex to around 64K, which is big enough
287     for almost everybody. However, I received a request for an even bigger limit.
288     For this reason, and also to make the code easier to maintain, the storing and
289     loading of offsets from the byte string is now handled by the macros that are
290     defined here.
291    
292     The macros are controlled by the value of LINK_SIZE. This defaults to 2 in
293     the config.h file, but can be overridden by using -D on the command line. This
294     is automated on Unix systems via the "configure" command. */
295    
296     #if LINK_SIZE == 2
297    
298     #define PUT(a,n,d) \
299     (a[n] = (d) >> 8), \
300     (a[(n)+1] = (d) & 255)
301    
302     #define GET(a,n) \
303     (((a)[n] << 8) | (a)[(n)+1])
304    
305     #define MAX_PATTERN_SIZE (1 << 16)
306    
307    
308     #elif LINK_SIZE == 3
309    
310     #define PUT(a,n,d) \
311     (a[n] = (d) >> 16), \
312     (a[(n)+1] = (d) >> 8), \
313     (a[(n)+2] = (d) & 255)
314    
315     #define GET(a,n) \
316     (((a)[n] << 16) | ((a)[(n)+1] << 8) | (a)[(n)+2])
317    
318     #define MAX_PATTERN_SIZE (1 << 24)
319    
320    
321     #elif LINK_SIZE == 4
322    
323     #define PUT(a,n,d) \
324     (a[n] = (d) >> 24), \
325     (a[(n)+1] = (d) >> 16), \
326     (a[(n)+2] = (d) >> 8), \
327     (a[(n)+3] = (d) & 255)
328    
329     #define GET(a,n) \
330     (((a)[n] << 24) | ((a)[(n)+1] << 16) | ((a)[(n)+2] << 8) | (a)[(n)+3])
331    
332     #define MAX_PATTERN_SIZE (1 << 30) /* Keep it positive */
333    
334    
335     #else
336     #error LINK_SIZE must be either 2, 3, or 4
337     #endif
338    
339    
340     /* Convenience macro defined in terms of the others */
341    
342     #define PUTINC(a,n,d) PUT(a,n,d), a += LINK_SIZE
343    
344    
345     /* PCRE uses some other 2-byte quantities that do not change when the size of
346     offsets changes. There are used for repeat counts and for other things such as
347     capturing parenthesis numbers in back references. */
348    
349     #define PUT2(a,n,d) \
350     a[n] = (d) >> 8; \
351     a[(n)+1] = (d) & 255
352    
353     #define GET2(a,n) \
354     (((a)[n] << 8) | (a)[(n)+1])
355    
356     #define PUT2INC(a,n,d) PUT2(a,n,d), a += 2
357    
358    
359     /* When UTF-8 encoding is being used, a character is no longer just a single
360     byte. The macros for character handling generate simple sequences when used in
361 ph10 208 byte-mode, and more complicated ones for UTF-8 characters. BACKCHAR should
362     never be called in byte mode. To make sure it can never even appear when UTF-8
363 ph10 207 support is omitted, we don't even define it. */
364 nigel 77
365     #ifndef SUPPORT_UTF8
366 ph10 294 #define NEXTCHAR(p) p++;
367 nigel 77 #define GETCHAR(c, eptr) c = *eptr;
368     #define GETCHARTEST(c, eptr) c = *eptr;
369     #define GETCHARINC(c, eptr) c = *eptr++;
370     #define GETCHARINCTEST(c, eptr) c = *eptr++;
371     #define GETCHARLEN(c, eptr, len) c = *eptr;
372 ph10 207 /* #define BACKCHAR(eptr) */
373 nigel 77
374     #else /* SUPPORT_UTF8 */
375    
376 ph10 294 /* Advance a character pointer one byte in non-UTF-8 mode and by one character
377     in UTF-8 mode. */
378    
379     #define NEXTCHAR(p) \
380     p++; \
381 ph10 298 if (utf8) { while((*p & 0xc0) == 0x80) p++; }
382 ph10 294
383 nigel 77 /* Get the next UTF-8 character, not advancing the pointer. This is called when
384     we know we are in UTF-8 mode. */
385    
386     #define GETCHAR(c, eptr) \
387     c = *eptr; \
388 nigel 93 if (c >= 0xc0) \
389 nigel 77 { \
390     int gcii; \
391     int gcaa = _pcre_utf8_table4[c & 0x3f]; /* Number of additional bytes */ \
392     int gcss = 6*gcaa; \
393     c = (c & _pcre_utf8_table3[gcaa]) << gcss; \
394     for (gcii = 1; gcii <= gcaa; gcii++) \
395     { \
396     gcss -= 6; \
397     c |= (eptr[gcii] & 0x3f) << gcss; \
398     } \
399     }
400    
401     /* Get the next UTF-8 character, testing for UTF-8 mode, and not advancing the
402     pointer. */
403    
404     #define GETCHARTEST(c, eptr) \
405     c = *eptr; \
406 nigel 93 if (utf8 && c >= 0xc0) \
407 nigel 77 { \
408     int gcii; \
409     int gcaa = _pcre_utf8_table4[c & 0x3f]; /* Number of additional bytes */ \
410     int gcss = 6*gcaa; \
411     c = (c & _pcre_utf8_table3[gcaa]) << gcss; \
412     for (gcii = 1; gcii <= gcaa; gcii++) \
413     { \
414     gcss -= 6; \
415     c |= (eptr[gcii] & 0x3f) << gcss; \
416     } \
417     }
418    
419     /* Get the next UTF-8 character, advancing the pointer. This is called when we
420     know we are in UTF-8 mode. */
421    
422     #define GETCHARINC(c, eptr) \
423     c = *eptr++; \
424 nigel 93 if (c >= 0xc0) \
425 nigel 77 { \
426     int gcaa = _pcre_utf8_table4[c & 0x3f]; /* Number of additional bytes */ \
427     int gcss = 6*gcaa; \
428     c = (c & _pcre_utf8_table3[gcaa]) << gcss; \
429     while (gcaa-- > 0) \
430     { \
431     gcss -= 6; \
432     c |= (*eptr++ & 0x3f) << gcss; \
433     } \
434     }
435    
436     /* Get the next character, testing for UTF-8 mode, and advancing the pointer */
437    
438     #define GETCHARINCTEST(c, eptr) \
439     c = *eptr++; \
440 nigel 93 if (utf8 && c >= 0xc0) \
441 nigel 77 { \
442     int gcaa = _pcre_utf8_table4[c & 0x3f]; /* Number of additional bytes */ \
443     int gcss = 6*gcaa; \
444     c = (c & _pcre_utf8_table3[gcaa]) << gcss; \
445     while (gcaa-- > 0) \
446     { \
447     gcss -= 6; \
448     c |= (*eptr++ & 0x3f) << gcss; \
449     } \
450     }
451    
452     /* Get the next UTF-8 character, not advancing the pointer, incrementing length
453     if there are extra bytes. This is called when we know we are in UTF-8 mode. */
454    
455     #define GETCHARLEN(c, eptr, len) \
456     c = *eptr; \
457 nigel 93 if (c >= 0xc0) \
458 nigel 77 { \
459     int gcii; \
460     int gcaa = _pcre_utf8_table4[c & 0x3f]; /* Number of additional bytes */ \
461     int gcss = 6*gcaa; \
462     c = (c & _pcre_utf8_table3[gcaa]) << gcss; \
463     for (gcii = 1; gcii <= gcaa; gcii++) \
464     { \
465     gcss -= 6; \
466     c |= (eptr[gcii] & 0x3f) << gcss; \
467     } \
468     len += gcaa; \
469     }
470    
471     /* If the pointer is not at the start of a character, move it back until
472 ph10 208 it is. This is called only in UTF-8 mode - we don't put a test within the macro
473 ph10 207 because almost all calls are already within a block of UTF-8 only code. */
474 nigel 77
475 ph10 207 #define BACKCHAR(eptr) while((*eptr & 0xc0) == 0x80) eptr--
476 nigel 77
477     #endif
478    
479    
480     /* In case there is no definition of offsetof() provided - though any proper
481     Standard C system should have one. */
482    
483     #ifndef offsetof
484     #define offsetof(p_type,field) ((size_t)&(((p_type *)0)->field))
485     #endif
486    
487    
488     /* These are the public options that can change during matching. */
489    
490     #define PCRE_IMS (PCRE_CASELESS|PCRE_MULTILINE|PCRE_DOTALL)
491    
492 ph10 231 /* Private flags containing information about the compiled regex. They used to
493     live at the top end of the options word, but that got almost full, so now they
494 ph10 230 are in a 16-bit flags word. */
495 nigel 77
496 ph10 230 #define PCRE_NOPARTIAL 0x0001 /* can't use partial with this regex */
497     #define PCRE_FIRSTSET 0x0002 /* first_byte is set */
498     #define PCRE_REQCHSET 0x0004 /* req_byte is set */
499     #define PCRE_STARTLINE 0x0008 /* start after \n for multiline */
500     #define PCRE_JCHANGED 0x0010 /* j option used in regex */
501     #define PCRE_HASCRORLF 0x0020 /* explicit \r or \n in pattern */
502 nigel 77
503     /* Options for the "extra" block produced by pcre_study(). */
504    
505     #define PCRE_STUDY_MAPPED 0x01 /* a map of starting chars exists */
506    
507     /* Masks for identifying the public options that are permitted at compile
508     time, run time, or study time, respectively. */
509    
510 ph10 149 #define PCRE_NEWLINE_BITS (PCRE_NEWLINE_CR|PCRE_NEWLINE_LF|PCRE_NEWLINE_ANY| \
511     PCRE_NEWLINE_ANYCRLF)
512 nigel 93
513 nigel 77 #define PUBLIC_OPTIONS \
514     (PCRE_CASELESS|PCRE_EXTENDED|PCRE_ANCHORED|PCRE_MULTILINE| \
515     PCRE_DOTALL|PCRE_DOLLAR_ENDONLY|PCRE_EXTRA|PCRE_UNGREEDY|PCRE_UTF8| \
516 nigel 91 PCRE_NO_AUTO_CAPTURE|PCRE_NO_UTF8_CHECK|PCRE_AUTO_CALLOUT|PCRE_FIRSTLINE| \
517 ph10 231 PCRE_DUPNAMES|PCRE_NEWLINE_BITS|PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE)
518 nigel 77
519     #define PUBLIC_EXEC_OPTIONS \
520     (PCRE_ANCHORED|PCRE_NOTBOL|PCRE_NOTEOL|PCRE_NOTEMPTY|PCRE_NO_UTF8_CHECK| \
521 ph10 231 PCRE_PARTIAL|PCRE_NEWLINE_BITS|PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE)
522 nigel 77
523     #define PUBLIC_DFA_EXEC_OPTIONS \
524     (PCRE_ANCHORED|PCRE_NOTBOL|PCRE_NOTEOL|PCRE_NOTEMPTY|PCRE_NO_UTF8_CHECK| \
525 ph10 231 PCRE_PARTIAL|PCRE_DFA_SHORTEST|PCRE_DFA_RESTART|PCRE_NEWLINE_BITS| \
526     PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE)
527 nigel 77
528     #define PUBLIC_STUDY_OPTIONS 0 /* None defined */
529    
530     /* Magic number to provide a small check against being handed junk. Also used
531     to detect whether a pattern was compiled on a host of different endianness. */
532    
533     #define MAGIC_NUMBER 0x50435245UL /* 'PCRE' */
534    
535     /* Negative values for the firstchar and reqchar variables */
536    
537     #define REQ_UNSET (-2)
538     #define REQ_NONE (-1)
539    
540     /* The maximum remaining length of subject we are prepared to search for a
541     req_byte match. */
542    
543     #define REQ_BYTE_MAX 1000
544    
545     /* Flags added to firstbyte or reqbyte; a "non-literal" item is either a
546     variable-length repeat, or a anything other than literal characters. */
547    
548     #define REQ_CASELESS 0x0100 /* indicates caselessness */
549     #define REQ_VARY 0x0200 /* reqbyte followed non-literal item */
550    
551     /* Miscellaneous definitions */
552    
553     typedef int BOOL;
554    
555     #define FALSE 0
556     #define TRUE 1
557    
558 nigel 93 /* Escape items that are just an encoding of a particular data value. */
559 nigel 77
560     #ifndef ESC_e
561     #define ESC_e 27
562     #endif
563    
564     #ifndef ESC_f
565     #define ESC_f '\f'
566     #endif
567    
568     #ifndef ESC_n
569 nigel 93 #define ESC_n '\n'
570 nigel 77 #endif
571    
572     #ifndef ESC_r
573     #define ESC_r '\r'
574     #endif
575    
576     /* We can't officially use ESC_t because it is a POSIX reserved identifier
577     (presumably because of all the others like size_t). */
578    
579     #ifndef ESC_tee
580     #define ESC_tee '\t'
581     #endif
582    
583 nigel 87 /* Codes for different types of Unicode property */
584    
585     #define PT_ANY 0 /* Any property - matches all chars */
586     #define PT_LAMP 1 /* L& - the union of Lu, Ll, Lt */
587     #define PT_GC 2 /* General characteristic (e.g. L) */
588     #define PT_PC 3 /* Particular characteristic (e.g. Lu) */
589     #define PT_SC 4 /* Script (e.g. Han) */
590    
591     /* Flag bits and data types for the extended class (OP_XCLASS) for classes that
592     contain UTF-8 characters with values greater than 255. */
593    
594     #define XCL_NOT 0x01 /* Flag: this is a negative class */
595     #define XCL_MAP 0x02 /* Flag: a 32-byte map is present */
596    
597     #define XCL_END 0 /* Marks end of individual items */
598     #define XCL_SINGLE 1 /* Single item (one multibyte char) follows */
599     #define XCL_RANGE 2 /* A range (two multibyte chars) follows */
600     #define XCL_PROP 3 /* Unicode property (2-byte property code follows) */
601     #define XCL_NOTPROP 4 /* Unicode inverted property (ditto) */
602    
603 nigel 77 /* These are escaped items that aren't just an encoding of a particular data
604     value such as \n. They must have non-zero values, as check_escape() returns
605     their negation. Also, they must appear in the same order as in the opcode
606     definitions below, up to ESC_z. There's a dummy for OP_ANY because it
607     corresponds to "." rather than an escape sequence. The final one must be
608 nigel 93 ESC_REF as subsequent values are used for backreferences (\1, \2, \3, etc).
609     There are two tests in the code for an escape greater than ESC_b and less than
610     ESC_Z to detect the types that may be repeated. These are the types that
611     consume characters. If any new escapes are put in between that don't consume a
612 nigel 77 character, that code will have to change. */
613    
614 ph10 172 enum { ESC_A = 1, ESC_G, ESC_K, ESC_B, ESC_b, ESC_D, ESC_d, ESC_S, ESC_s,
615 ph10 178 ESC_W, ESC_w, ESC_dum1, ESC_C, ESC_P, ESC_p, ESC_R, ESC_H, ESC_h,
616 ph10 333 ESC_V, ESC_v, ESC_X, ESC_Z, ESC_z, ESC_E, ESC_Q, ESC_g, ESC_k, ESC_REF };
617 nigel 77
618 nigel 93
619 ph10 210 /* Opcode table: Starting from 1 (i.e. after OP_END), the values up to
620 nigel 77 OP_EOD must correspond in order to the list of escapes immediately above.
621    
622 nigel 93 *** NOTE NOTE NOTE *** Whenever this list is updated, the two macro definitions
623     that follow must also be updated to match. There is also a table called
624     "coptable" in pcre_dfa_exec.c that must be updated. */
625    
626 nigel 77 enum {
627     OP_END, /* 0 End of pattern */
628    
629     /* Values corresponding to backslashed metacharacters */
630    
631     OP_SOD, /* 1 Start of data: \A */
632     OP_SOM, /* 2 Start of match (subject + offset): \G */
633 ph10 172 OP_SET_SOM, /* 3 Set start of match (\K) */
634 ph10 168 OP_NOT_WORD_BOUNDARY, /* 4 \B */
635     OP_WORD_BOUNDARY, /* 5 \b */
636     OP_NOT_DIGIT, /* 6 \D */
637     OP_DIGIT, /* 7 \d */
638     OP_NOT_WHITESPACE, /* 8 \S */
639     OP_WHITESPACE, /* 9 \s */
640     OP_NOT_WORDCHAR, /* 10 \W */
641     OP_WORDCHAR, /* 11 \w */
642     OP_ANY, /* 12 Match any character */
643     OP_ANYBYTE, /* 13 Match any byte (\C); different to OP_ANY for UTF-8 */
644     OP_NOTPROP, /* 14 \P (not Unicode property) */
645     OP_PROP, /* 15 \p (Unicode property) */
646     OP_ANYNL, /* 16 \R (any newline sequence) */
647 ph10 178 OP_NOT_HSPACE, /* 17 \H (not horizontal whitespace) */
648     OP_HSPACE, /* 18 \h (horizontal whitespace) */
649     OP_NOT_VSPACE, /* 19 \V (not vertical whitespace) */
650     OP_VSPACE, /* 20 \v (vertical whitespace) */
651     OP_EXTUNI, /* 21 \X (extended Unicode sequence */
652     OP_EODN, /* 22 End of data or \n at end of data: \Z. */
653     OP_EOD, /* 23 End of data: \z */
654 nigel 77
655 ph10 178 OP_OPT, /* 24 Set runtime options */
656     OP_CIRC, /* 25 Start of line - varies with multiline switch */
657     OP_DOLL, /* 26 End of line - varies with multiline switch */
658     OP_CHAR, /* 27 Match one character, casefully */
659     OP_CHARNC, /* 28 Match one character, caselessly */
660     OP_NOT, /* 29 Match one character, not the following one */
661 nigel 77
662 ph10 178 OP_STAR, /* 30 The maximizing and minimizing versions of */
663     OP_MINSTAR, /* 31 these six opcodes must come in pairs, with */
664     OP_PLUS, /* 32 the minimizing one second. */
665     OP_MINPLUS, /* 33 This first set applies to single characters.*/
666     OP_QUERY, /* 34 */
667     OP_MINQUERY, /* 35 */
668 nigel 77
669 ph10 178 OP_UPTO, /* 36 From 0 to n matches */
670     OP_MINUPTO, /* 37 */
671     OP_EXACT, /* 38 Exactly n matches */
672 nigel 77
673 ph10 178 OP_POSSTAR, /* 39 Possessified star */
674     OP_POSPLUS, /* 40 Possessified plus */
675     OP_POSQUERY, /* 41 Posesssified query */
676     OP_POSUPTO, /* 42 Possessified upto */
677 nigel 77
678 ph10 178 OP_NOTSTAR, /* 43 The maximizing and minimizing versions of */
679     OP_NOTMINSTAR, /* 44 these six opcodes must come in pairs, with */
680     OP_NOTPLUS, /* 45 the minimizing one second. They must be in */
681     OP_NOTMINPLUS, /* 46 exactly the same order as those above. */
682     OP_NOTQUERY, /* 47 This set applies to "not" single characters. */
683     OP_NOTMINQUERY, /* 48 */
684 nigel 77
685 ph10 178 OP_NOTUPTO, /* 49 From 0 to n matches */
686     OP_NOTMINUPTO, /* 50 */
687     OP_NOTEXACT, /* 51 Exactly n matches */
688 nigel 93
689 ph10 178 OP_NOTPOSSTAR, /* 52 Possessified versions */
690     OP_NOTPOSPLUS, /* 53 */
691     OP_NOTPOSQUERY, /* 54 */
692     OP_NOTPOSUPTO, /* 55 */
693 nigel 93
694 ph10 178 OP_TYPESTAR, /* 56 The maximizing and minimizing versions of */
695     OP_TYPEMINSTAR, /* 57 these six opcodes must come in pairs, with */
696     OP_TYPEPLUS, /* 58 the minimizing one second. These codes must */
697     OP_TYPEMINPLUS, /* 59 be in exactly the same order as those above. */
698     OP_TYPEQUERY, /* 60 This set applies to character types such as \d */
699     OP_TYPEMINQUERY, /* 61 */
700 nigel 93
701 ph10 178 OP_TYPEUPTO, /* 62 From 0 to n matches */
702     OP_TYPEMINUPTO, /* 63 */
703     OP_TYPEEXACT, /* 64 Exactly n matches */
704 nigel 93
705 ph10 178 OP_TYPEPOSSTAR, /* 65 Possessified versions */
706     OP_TYPEPOSPLUS, /* 66 */
707     OP_TYPEPOSQUERY, /* 67 */
708     OP_TYPEPOSUPTO, /* 68 */
709 nigel 93
710 ph10 178 OP_CRSTAR, /* 69 The maximizing and minimizing versions of */
711     OP_CRMINSTAR, /* 70 all these opcodes must come in pairs, with */
712     OP_CRPLUS, /* 71 the minimizing one second. These codes must */
713     OP_CRMINPLUS, /* 72 be in exactly the same order as those above. */
714     OP_CRQUERY, /* 73 These are for character classes and back refs */
715     OP_CRMINQUERY, /* 74 */
716     OP_CRRANGE, /* 75 These are different to the three sets above. */
717     OP_CRMINRANGE, /* 76 */
718 nigel 93
719 ph10 178 OP_CLASS, /* 77 Match a character class, chars < 256 only */
720     OP_NCLASS, /* 78 Same, but the bitmap was created from a negative
721 nigel 77 class - the difference is relevant only when a UTF-8
722     character > 255 is encountered. */
723    
724 ph10 178 OP_XCLASS, /* 79 Extended class for handling UTF-8 chars within the
725 nigel 77 class. This does both positive and negative. */
726    
727 ph10 178 OP_REF, /* 80 Match a back reference */
728     OP_RECURSE, /* 81 Match a numbered subpattern (possibly recursive) */
729     OP_CALLOUT, /* 82 Call out to external function if provided */
730 nigel 77
731 ph10 178 OP_ALT, /* 83 Start of alternation */
732     OP_KET, /* 84 End of group that doesn't have an unbounded repeat */
733     OP_KETRMAX, /* 85 These two must remain together and in this */
734     OP_KETRMIN, /* 86 order. They are for groups the repeat for ever. */
735 nigel 77
736 nigel 93 /* The assertions must come before BRA, CBRA, ONCE, and COND.*/
737 nigel 77
738 ph10 178 OP_ASSERT, /* 87 Positive lookahead */
739     OP_ASSERT_NOT, /* 88 Negative lookahead */
740     OP_ASSERTBACK, /* 89 Positive lookbehind */
741     OP_ASSERTBACK_NOT, /* 90 Negative lookbehind */
742     OP_REVERSE, /* 91 Move pointer back - used in lookbehind assertions */
743 nigel 77
744 nigel 93 /* ONCE, BRA, CBRA, and COND must come after the assertions, with ONCE first,
745     as there's a test for >= ONCE for a subpattern that isn't an assertion. */
746 nigel 77
747 ph10 178 OP_ONCE, /* 92 Atomic group */
748 ph10 190 OP_BRA, /* 93 Start of non-capturing bracket */
749 ph10 178 OP_CBRA, /* 94 Start of capturing bracket */
750     OP_COND, /* 95 Conditional group */
751 nigel 77
752 nigel 93 /* These three must follow the previous three, in the same order. There's a
753     check for >= SBRA to distinguish the two sets. */
754 nigel 77
755 ph10 178 OP_SBRA, /* 96 Start of non-capturing bracket, check empty */
756     OP_SCBRA, /* 97 Start of capturing bracket, check empty */
757     OP_SCOND, /* 98 Conditional group, check empty */
758 nigel 77
759 ph10 178 OP_CREF, /* 99 Used to hold a capture number as condition */
760     OP_RREF, /* 100 Used to hold a recursion number as condition */
761     OP_DEF, /* 101 The DEFINE condition */
762 nigel 93
763 ph10 178 OP_BRAZERO, /* 102 These two must remain together and in this */
764 ph10 210 OP_BRAMINZERO, /* 103 order. */
765    
766     /* These are backtracking control verbs */
767    
768     OP_PRUNE, /* 104 */
769     OP_SKIP, /* 105 */
770     OP_THEN, /* 106 */
771     OP_COMMIT, /* 107 */
772    
773     /* These are forced failure and success verbs */
774    
775     OP_FAIL, /* 108 */
776 ph10 335 OP_ACCEPT, /* 109 */
777    
778     /* This is used to skip a subpattern with a {0} quantifier */
779    
780     OP_SKIPZERO /* 110 */
781 nigel 77 };
782    
783    
784     /* This macro defines textual names for all the opcodes. These are used only
785     for debugging. The macro is referenced only in pcre_printint.c. */
786    
787     #define OP_NAME_LIST \
788 ph10 168 "End", "\\A", "\\G", "\\K", "\\B", "\\b", "\\D", "\\d", \
789 nigel 77 "\\S", "\\s", "\\W", "\\w", "Any", "Anybyte", \
790 ph10 178 "notprop", "prop", "\\R", "\\H", "\\h", "\\V", "\\v", \
791     "extuni", "\\Z", "\\z", \
792 nigel 77 "Opt", "^", "$", "char", "charnc", "not", \
793     "*", "*?", "+", "+?", "?", "??", "{", "{", "{", \
794 nigel 93 "*+","++", "?+", "{", \
795 nigel 77 "*", "*?", "+", "+?", "?", "??", "{", "{", "{", \
796 nigel 93 "*+","++", "?+", "{", \
797 nigel 77 "*", "*?", "+", "+?", "?", "??", "{", "{", "{", \
798 nigel 93 "*+","++", "?+", "{", \
799 nigel 77 "*", "*?", "+", "+?", "?", "??", "{", "{", \
800     "class", "nclass", "xclass", "Ref", "Recurse", "Callout", \
801     "Alt", "Ket", "KetRmax", "KetRmin", "Assert", "Assert not", \
802 nigel 93 "AssertB", "AssertB not", "Reverse", \
803 ph10 192 "Once", "Bra", "CBra", "Cond", "SBra", "SCBra", "SCond", \
804 ph10 210 "Cond ref", "Cond rec", "Cond def", "Brazero", "Braminzero", \
805 ph10 335 "*PRUNE", "*SKIP", "*THEN", "*COMMIT", "*FAIL", "*ACCEPT", \
806     "Skip zero"
807 nigel 77
808    
809     /* This macro defines the length of fixed length operations in the compiled
810     regex. The lengths are used when searching for specific things, and also in the
811     debugging printing of a compiled regex. We use a macro so that it can be
812     defined close to the definitions of the opcodes themselves.
813    
814     As things have been extended, some of these are no longer fixed lenths, but are
815     minima instead. For example, the length of a single-character repeat may vary
816     in UTF-8 mode. The code that uses this table must know about such things. */
817    
818     #define OP_LENGTHS \
819     1, /* End */ \
820 ph10 168 1, 1, 1, 1, 1, /* \A, \G, \K, \B, \b */ \
821     1, 1, 1, 1, 1, 1, /* \D, \d, \S, \s, \W, \w */ \
822 nigel 77 1, 1, /* Any, Anybyte */ \
823 ph10 178 3, 3, 1, /* NOTPROP, PROP, EXTUNI */ \
824     1, 1, 1, 1, 1, /* \R, \H, \h, \V, \v */ \
825 nigel 77 1, 1, 2, 1, 1, /* \Z, \z, Opt, ^, $ */ \
826     2, /* Char - the minimum length */ \
827     2, /* Charnc - the minimum length */ \
828     2, /* not */ \
829     /* Positive single-char repeats ** These are */ \
830     2, 2, 2, 2, 2, 2, /* *, *?, +, +?, ?, ?? ** minima in */ \
831     4, 4, 4, /* upto, minupto, exact ** UTF-8 mode */ \
832 nigel 93 2, 2, 2, 4, /* *+, ++, ?+, upto+ */ \
833 nigel 77 /* Negative single-char repeats - only for chars < 256 */ \
834     2, 2, 2, 2, 2, 2, /* NOT *, *?, +, +?, ?, ?? */ \
835     4, 4, 4, /* NOT upto, minupto, exact */ \
836 nigel 93 2, 2, 2, 4, /* Possessive *, +, ?, upto */ \
837 nigel 77 /* Positive type repeats */ \
838     2, 2, 2, 2, 2, 2, /* Type *, *?, +, +?, ?, ?? */ \
839     4, 4, 4, /* Type upto, minupto, exact */ \
840 nigel 93 2, 2, 2, 4, /* Possessive *+, ++, ?+, upto+ */ \
841 nigel 77 /* Character class & ref repeats */ \
842     1, 1, 1, 1, 1, 1, /* *, *?, +, +?, ?, ?? */ \
843     5, 5, /* CRRANGE, CRMINRANGE */ \
844     33, /* CLASS */ \
845     33, /* NCLASS */ \
846     0, /* XCLASS - variable length */ \
847     3, /* REF */ \
848     1+LINK_SIZE, /* RECURSE */ \
849     2+2*LINK_SIZE, /* CALLOUT */ \
850     1+LINK_SIZE, /* Alt */ \
851     1+LINK_SIZE, /* Ket */ \
852     1+LINK_SIZE, /* KetRmax */ \
853     1+LINK_SIZE, /* KetRmin */ \
854     1+LINK_SIZE, /* Assert */ \
855     1+LINK_SIZE, /* Assert not */ \
856     1+LINK_SIZE, /* Assert behind */ \
857     1+LINK_SIZE, /* Assert behind not */ \
858     1+LINK_SIZE, /* Reverse */ \
859 nigel 93 1+LINK_SIZE, /* ONCE */ \
860     1+LINK_SIZE, /* BRA */ \
861     3+LINK_SIZE, /* CBRA */ \
862 nigel 77 1+LINK_SIZE, /* COND */ \
863 nigel 93 1+LINK_SIZE, /* SBRA */ \
864     3+LINK_SIZE, /* SCBRA */ \
865     1+LINK_SIZE, /* SCOND */ \
866 nigel 77 3, /* CREF */ \
867 nigel 93 3, /* RREF */ \
868     1, /* DEF */ \
869 nigel 77 1, 1, /* BRAZERO, BRAMINZERO */ \
870 ph10 210 1, 1, 1, 1, /* PRUNE, SKIP, THEN, COMMIT, */ \
871 ph10 335 1, 1, 1 /* FAIL, ACCEPT, SKIPZERO */
872 nigel 77
873    
874 nigel 93 /* A magic value for OP_RREF to indicate the "any recursion" condition. */
875 nigel 77
876 nigel 93 #define RREF_ANY 0xffff
877 nigel 77
878     /* Error code numbers. They are given names so that they can more easily be
879     tracked. */
880    
881     enum { ERR0, ERR1, ERR2, ERR3, ERR4, ERR5, ERR6, ERR7, ERR8, ERR9,
882     ERR10, ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19,
883     ERR20, ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR28, ERR29,
884     ERR30, ERR31, ERR32, ERR33, ERR34, ERR35, ERR36, ERR37, ERR38, ERR39,
885 nigel 91 ERR40, ERR41, ERR42, ERR43, ERR44, ERR45, ERR46, ERR47, ERR48, ERR49,
886 ph10 210 ERR50, ERR51, ERR52, ERR53, ERR54, ERR55, ERR56, ERR57, ERR58, ERR59,
887 ph10 269 ERR60, ERR61, ERR62, ERR63 };
888 nigel 77
889     /* The real format of the start of the pcre block; the index of names and the
890     code vector run on as long as necessary after the end. We store an explicit
891     offset to the name table so that if a regex is compiled on one host, saved, and
892     then run on another where the size of pointers is different, all might still
893     be well. For the case of compiled-on-4 and run-on-8, we include an extra
894     pointer that is always NULL. For future-proofing, a few dummy fields were
895     originally included - even though you can never get this planning right - but
896     there is only one left now.
897    
898     NOTE NOTE NOTE:
899     Because people can now save and re-use compiled patterns, any additions to this
900     structure should be made at the end, and something earlier (e.g. a new
901     flag in the options or one of the dummy fields) should indicate that the new
902     fields are present. Currently PCRE always sets the dummy fields to zero.
903     NOTE NOTE NOTE:
904     */
905    
906     typedef struct real_pcre {
907     pcre_uint32 magic_number;
908     pcre_uint32 size; /* Total that was malloced */
909 ph10 230 pcre_uint32 options; /* Public options */
910     pcre_uint16 flags; /* Private flags */
911     pcre_uint16 dummy1; /* For future use */
912 nigel 77 pcre_uint16 top_bracket;
913     pcre_uint16 top_backref;
914     pcre_uint16 first_byte;
915     pcre_uint16 req_byte;
916     pcre_uint16 name_table_offset; /* Offset to name table that follows */
917     pcre_uint16 name_entry_size; /* Size of any name items */
918     pcre_uint16 name_count; /* Number of name items */
919     pcre_uint16 ref_count; /* Reference count */
920    
921     const unsigned char *tables; /* Pointer to tables or NULL for std */
922     const unsigned char *nullpad; /* NULL padding */
923     } real_pcre;
924    
925     /* The format of the block used to store data from pcre_study(). The same
926     remark (see NOTE above) about extending this structure applies. */
927    
928     typedef struct pcre_study_data {
929     pcre_uint32 size; /* Total that was malloced */
930     pcre_uint32 options;
931     uschar start_bits[32];
932     } pcre_study_data;
933    
934     /* Structure for passing "static" information around between the functions
935     doing the compiling, so that they are thread-safe. */
936    
937     typedef struct compile_data {
938     const uschar *lcc; /* Points to lower casing table */
939     const uschar *fcc; /* Points to case-flipping table */
940     const uschar *cbits; /* Points to character type table */
941     const uschar *ctypes; /* Points to table of type maps */
942 nigel 93 const uschar *start_workspace;/* The start of working space */
943 nigel 77 const uschar *start_code; /* The start of the compiled code */
944     const uschar *start_pattern; /* The start of the pattern */
945 nigel 93 const uschar *end_pattern; /* The end of the pattern */
946     uschar *hwm; /* High watermark of workspace */
947 nigel 77 uschar *name_table; /* The name/number table */
948     int names_found; /* Number of entries so far */
949     int name_entry_size; /* Size of each entry */
950 ph10 270 int bracount; /* Count of capturing parens as we compile */
951 ph10 286 int final_bracount; /* Saved value after first pass */
952 nigel 77 int top_backref; /* Maximum back reference */
953     unsigned int backref_map; /* Bitmap of low back refs */
954 nigel 93 int external_options; /* External (initial) options */
955 ph10 231 int external_flags; /* External flag bits to be set */
956 nigel 77 int req_varyopt; /* "After variable item" flag for reqbyte */
957 ph10 211 BOOL had_accept; /* (*ACCEPT) encountered */
958 nigel 93 int nltype; /* Newline type */
959     int nllen; /* Newline string length */
960     uschar nl[4]; /* Newline string when fixed length */
961 nigel 77 } compile_data;
962    
963     /* Structure for maintaining a chain of pointers to the currently incomplete
964     branches, for testing for left recursion. */
965    
966     typedef struct branch_chain {
967     struct branch_chain *outer;
968     uschar *current;
969     } branch_chain;
970    
971     /* Structure for items in a linked list that represents an explicit recursive
972     call within the pattern. */
973    
974     typedef struct recursion_info {
975     struct recursion_info *prevrec; /* Previous recursion record (or NULL) */
976     int group_num; /* Number of group that was called */
977     const uschar *after_call; /* "Return value": points after the call in the expr */
978 ph10 168 USPTR save_start; /* Old value of mstart */
979 nigel 77 int *offset_save; /* Pointer to start of saved offsets */
980     int saved_max; /* Number of saved offsets */
981     } recursion_info;
982    
983 nigel 93 /* Structure for building a chain of data for holding the values of the subject
984     pointer at the start of each subpattern, so as to detect when an empty string
985     has been matched by a subpattern - to break infinite loops. */
986    
987     typedef struct eptrblock {
988     struct eptrblock *epb_prev;
989     USPTR epb_saved_eptr;
990     } eptrblock;
991    
992    
993 nigel 77 /* Structure for passing "static" information around between the functions
994     doing traditional NFA matching, so that they are thread-safe. */
995    
996     typedef struct match_data {
997 nigel 87 unsigned long int match_call_count; /* As it says */
998     unsigned long int match_limit; /* As it says */
999     unsigned long int match_limit_recursion; /* As it says */
1000 nigel 77 int *offset_vector; /* Offset vector */
1001     int offset_end; /* One past the end */
1002     int offset_max; /* The maximum usable for return data */
1003 nigel 93 int nltype; /* Newline type */
1004     int nllen; /* Newline string length */
1005     uschar nl[4]; /* Newline string when fixed */
1006 nigel 77 const uschar *lcc; /* Points to lower casing table */
1007     const uschar *ctypes; /* Points to table of type maps */
1008     BOOL offset_overflow; /* Set if too many extractions */
1009     BOOL notbol; /* NOTBOL flag */
1010     BOOL noteol; /* NOTEOL flag */
1011     BOOL utf8; /* UTF8 flag */
1012     BOOL endonly; /* Dollar not before final \n */
1013     BOOL notempty; /* Empty string match not wanted */
1014     BOOL partial; /* PARTIAL flag */
1015     BOOL hitend; /* Hit the end of the subject at some point */
1016 ph10 231 BOOL bsr_anycrlf; /* \R is just any CRLF, not full Unicode */
1017 nigel 77 const uschar *start_code; /* For use when recursing */
1018 nigel 87 USPTR start_subject; /* Start of the subject string */
1019     USPTR end_subject; /* End of the subject string */
1020 ph10 168 USPTR start_match_ptr; /* Start of matched string */
1021 nigel 87 USPTR end_match_ptr; /* Subject position at end match */
1022 nigel 77 int end_offset_top; /* Highwater mark at end of match */
1023     int capture_last; /* Most recent capture number */
1024     int start_offset; /* The start offset value */
1025 nigel 93 eptrblock *eptrchain; /* Chain of eptrblocks for tail recursions */
1026     int eptrn; /* Next free eptrblock */
1027 nigel 77 recursion_info *recursive; /* Linked list of recursion data */
1028     void *callout_data; /* To pass back to callouts */
1029     } match_data;
1030    
1031     /* A similar structure is used for the same purpose by the DFA matching
1032     functions. */
1033    
1034     typedef struct dfa_match_data {
1035     const uschar *start_code; /* Start of the compiled pattern */
1036     const uschar *start_subject; /* Start of the subject string */
1037     const uschar *end_subject; /* End of subject string */
1038     const uschar *tables; /* Character tables */
1039     int moptions; /* Match options */
1040     int poptions; /* Pattern options */
1041 nigel 93 int nltype; /* Newline type */
1042     int nllen; /* Newline string length */
1043     uschar nl[4]; /* Newline string when fixed */
1044 nigel 77 void *callout_data; /* To pass back to callouts */
1045     } dfa_match_data;
1046    
1047     /* Bit definitions for entries in the pcre_ctypes table. */
1048    
1049     #define ctype_space 0x01
1050     #define ctype_letter 0x02
1051     #define ctype_digit 0x04
1052     #define ctype_xdigit 0x08
1053 ph10 274 #define ctype_word 0x10 /* alphanumeric or '_' */
1054 nigel 77 #define ctype_meta 0x80 /* regexp meta char or zero (end pattern) */
1055    
1056     /* Offsets for the bitmap tables in pcre_cbits. Each table contains a set
1057     of bits for a class map. Some classes are built by combining these tables. */
1058    
1059     #define cbit_space 0 /* [:space:] or \s */
1060     #define cbit_xdigit 32 /* [:xdigit:] */
1061     #define cbit_digit 64 /* [:digit:] or \d */
1062     #define cbit_upper 96 /* [:upper:] */
1063     #define cbit_lower 128 /* [:lower:] */
1064     #define cbit_word 160 /* [:word:] or \w */
1065     #define cbit_graph 192 /* [:graph:] */
1066     #define cbit_print 224 /* [:print:] */
1067     #define cbit_punct 256 /* [:punct:] */
1068     #define cbit_cntrl 288 /* [:cntrl:] */
1069     #define cbit_length 320 /* Length of the cbits table */
1070    
1071     /* Offsets of the various tables from the base tables pointer, and
1072     total length. */
1073    
1074     #define lcc_offset 0
1075     #define fcc_offset 256
1076     #define cbits_offset 512
1077     #define ctypes_offset (cbits_offset + cbit_length)
1078     #define tables_length (ctypes_offset + 256)
1079    
1080 nigel 87 /* Layout of the UCP type table that translates property names into types and
1081 ph10 240 codes. Each entry used to point directly to a name, but to reduce the number of
1082 ph10 243 relocations in shared libraries, it now has an offset into a single string
1083 ph10 240 instead. */
1084 nigel 77
1085     typedef struct {
1086 ph10 243 pcre_uint16 name_offset;
1087 nigel 87 pcre_uint16 type;
1088     pcre_uint16 value;
1089 nigel 77 } ucp_type_table;
1090    
1091    
1092     /* Internal shared data tables. These are tables that are used by more than one
1093     of the exported public functions. They have to be "external" in the C sense,
1094     but are not part of the PCRE public API. The data for these tables is in the
1095     pcre_tables.c module. */
1096    
1097     extern const int _pcre_utf8_table1[];
1098     extern const int _pcre_utf8_table2[];
1099     extern const int _pcre_utf8_table3[];
1100     extern const uschar _pcre_utf8_table4[];
1101    
1102     extern const int _pcre_utf8_table1_size;
1103    
1104 ph10 240 extern const char _pcre_utt_names[];
1105 nigel 77 extern const ucp_type_table _pcre_utt[];
1106     extern const int _pcre_utt_size;
1107    
1108     extern const uschar _pcre_default_tables[];
1109    
1110     extern const uschar _pcre_OP_lengths[];
1111    
1112    
1113     /* Internal shared functions. These are functions that are used by more than
1114     one of the exported public functions. They have to be "external" in the C
1115     sense, but are not part of the PCRE public API. */
1116    
1117 ph10 150 extern BOOL _pcre_is_newline(const uschar *, int, const uschar *,
1118 ph10 149 int *, BOOL);
1119 nigel 93 extern int _pcre_ord2utf8(int, uschar *);
1120     extern real_pcre *_pcre_try_flipped(const real_pcre *, real_pcre *,
1121     const pcre_study_data *, pcre_study_data *);
1122     extern int _pcre_ucp_findprop(const unsigned int, int *, int *);
1123     extern unsigned int _pcre_ucp_othercase(const unsigned int);
1124     extern int _pcre_valid_utf8(const uschar *, int);
1125 ph10 150 extern BOOL _pcre_was_newline(const uschar *, int, const uschar *,
1126 ph10 149 int *, BOOL);
1127 nigel 93 extern BOOL _pcre_xclass(int, const uschar *);
1128 nigel 77
1129 nigel 85 #endif
1130    
1131 nigel 77 /* End of pcre_internal.h */

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