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Revision 1055 - (show annotations) (download)
Tue Oct 16 15:53:30 2012 UTC (2 years ago) by chpe
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pcre32: Add 32-bit library

Create libpcre32 that operates on 32-bit characters (UTF-32).

This turned out to be surprisingly simple after the UTF-16 support
was introduced; mostly just extra ifdefs and adjusting and adding
some tests.
1 /*************************************************
2 * Perl-Compatible Regular Expressions *
3 *************************************************/
4
5 /* PCRE is a library of functions to support regular expressions whose syntax
6 and semantics are as close as possible to those of the Perl 5 language.
7
8 Written by Philip Hazel
9 Copyright (c) 1997-2012 University of Cambridge
10
11 -----------------------------------------------------------------------------
12 Redistribution and use in source and binary forms, with or without
13 modification, are permitted provided that the following conditions are met:
14
15 * Redistributions of source code must retain the above copyright notice,
16 this list of conditions and the following disclaimer.
17
18 * Redistributions in binary form must reproduce the above copyright
19 notice, this list of conditions and the following disclaimer in the
20 documentation and/or other materials provided with the distribution.
21
22 * Neither the name of the University of Cambridge nor the names of its
23 contributors may be used to endorse or promote products derived from
24 this software without specific prior written permission.
25
26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 POSSIBILITY OF SUCH DAMAGE.
37 -----------------------------------------------------------------------------
38 */
39
40
41 /* This module contains some convenience functions for extracting substrings
42 from the subject string after a regex match has succeeded. The original idea
43 for these functions came from Scott Wimer. */
44
45
46 #ifdef HAVE_CONFIG_H
47 #include "config.h"
48 #endif
49
50 #include "pcre_internal.h"
51
52
53 /*************************************************
54 * Find number for named string *
55 *************************************************/
56
57 /* This function is used by the get_first_set() function below, as well
58 as being generally available. It assumes that names are unique.
59
60 Arguments:
61 code the compiled regex
62 stringname the name whose number is required
63
64 Returns: the number of the named parentheses, or a negative number
65 (PCRE_ERROR_NOSUBSTRING) if not found
66 */
67
68 #if defined COMPILE_PCRE8
69 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
70 pcre_get_stringnumber(const pcre *code, const char *stringname)
71 #elif defined COMPILE_PCRE16
72 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
73 pcre16_get_stringnumber(const pcre16 *code, PCRE_SPTR16 stringname)
74 #elif defined COMPILE_PCRE32
75 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
76 pcre32_get_stringnumber(const pcre32 *code, PCRE_SPTR32 stringname)
77 #endif
78 {
79 int rc;
80 int entrysize;
81 int top, bot;
82 pcre_uchar *nametable;
83
84 #ifdef COMPILE_PCRE8
85 if ((rc = pcre_fullinfo(code, NULL, PCRE_INFO_NAMECOUNT, &top)) != 0)
86 return rc;
87 if (top <= 0) return PCRE_ERROR_NOSUBSTRING;
88
89 if ((rc = pcre_fullinfo(code, NULL, PCRE_INFO_NAMEENTRYSIZE, &entrysize)) != 0)
90 return rc;
91 if ((rc = pcre_fullinfo(code, NULL, PCRE_INFO_NAMETABLE, &nametable)) != 0)
92 return rc;
93 #endif
94 #ifdef COMPILE_PCRE16
95 if ((rc = pcre16_fullinfo(code, NULL, PCRE_INFO_NAMECOUNT, &top)) != 0)
96 return rc;
97 if (top <= 0) return PCRE_ERROR_NOSUBSTRING;
98
99 if ((rc = pcre16_fullinfo(code, NULL, PCRE_INFO_NAMEENTRYSIZE, &entrysize)) != 0)
100 return rc;
101 if ((rc = pcre16_fullinfo(code, NULL, PCRE_INFO_NAMETABLE, &nametable)) != 0)
102 return rc;
103 #endif
104 #ifdef COMPILE_PCRE32
105 if ((rc = pcre32_fullinfo(code, NULL, PCRE_INFO_NAMECOUNT, &top)) != 0)
106 return rc;
107 if (top <= 0) return PCRE_ERROR_NOSUBSTRING;
108
109 if ((rc = pcre32_fullinfo(code, NULL, PCRE_INFO_NAMEENTRYSIZE, &entrysize)) != 0)
110 return rc;
111 if ((rc = pcre32_fullinfo(code, NULL, PCRE_INFO_NAMETABLE, &nametable)) != 0)
112 return rc;
113 #endif
114
115 bot = 0;
116 while (top > bot)
117 {
118 int mid = (top + bot) / 2;
119 pcre_uchar *entry = nametable + entrysize*mid;
120 int c = STRCMP_UC_UC((pcre_uchar *)stringname,
121 (pcre_uchar *)(entry + IMM2_SIZE));
122 if (c == 0) return GET2(entry, 0);
123 if (c > 0) bot = mid + 1; else top = mid;
124 }
125
126 return PCRE_ERROR_NOSUBSTRING;
127 }
128
129
130
131 /*************************************************
132 * Find (multiple) entries for named string *
133 *************************************************/
134
135 /* This is used by the get_first_set() function below, as well as being
136 generally available. It is used when duplicated names are permitted.
137
138 Arguments:
139 code the compiled regex
140 stringname the name whose entries required
141 firstptr where to put the pointer to the first entry
142 lastptr where to put the pointer to the last entry
143
144 Returns: the length of each entry, or a negative number
145 (PCRE_ERROR_NOSUBSTRING) if not found
146 */
147
148 #if defined COMPILE_PCRE8
149 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
150 pcre_get_stringtable_entries(const pcre *code, const char *stringname,
151 char **firstptr, char **lastptr)
152 #elif defined COMPILE_PCRE16
153 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
154 pcre16_get_stringtable_entries(const pcre16 *code, PCRE_SPTR16 stringname,
155 PCRE_UCHAR16 **firstptr, PCRE_UCHAR16 **lastptr)
156 #elif defined COMPILE_PCRE32
157 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
158 pcre32_get_stringtable_entries(const pcre32 *code, PCRE_SPTR32 stringname,
159 PCRE_UCHAR32 **firstptr, PCRE_UCHAR32 **lastptr)
160 #endif
161 {
162 int rc;
163 int entrysize;
164 int top, bot;
165 pcre_uchar *nametable, *lastentry;
166
167 #ifdef COMPILE_PCRE8
168 if ((rc = pcre_fullinfo(code, NULL, PCRE_INFO_NAMECOUNT, &top)) != 0)
169 return rc;
170 if (top <= 0) return PCRE_ERROR_NOSUBSTRING;
171
172 if ((rc = pcre_fullinfo(code, NULL, PCRE_INFO_NAMEENTRYSIZE, &entrysize)) != 0)
173 return rc;
174 if ((rc = pcre_fullinfo(code, NULL, PCRE_INFO_NAMETABLE, &nametable)) != 0)
175 return rc;
176 #endif
177 #ifdef COMPILE_PCRE16
178 if ((rc = pcre16_fullinfo(code, NULL, PCRE_INFO_NAMECOUNT, &top)) != 0)
179 return rc;
180 if (top <= 0) return PCRE_ERROR_NOSUBSTRING;
181
182 if ((rc = pcre16_fullinfo(code, NULL, PCRE_INFO_NAMEENTRYSIZE, &entrysize)) != 0)
183 return rc;
184 if ((rc = pcre16_fullinfo(code, NULL, PCRE_INFO_NAMETABLE, &nametable)) != 0)
185 return rc;
186 #endif
187 #ifdef COMPILE_PCRE32
188 if ((rc = pcre32_fullinfo(code, NULL, PCRE_INFO_NAMECOUNT, &top)) != 0)
189 return rc;
190 if (top <= 0) return PCRE_ERROR_NOSUBSTRING;
191
192 if ((rc = pcre32_fullinfo(code, NULL, PCRE_INFO_NAMEENTRYSIZE, &entrysize)) != 0)
193 return rc;
194 if ((rc = pcre32_fullinfo(code, NULL, PCRE_INFO_NAMETABLE, &nametable)) != 0)
195 return rc;
196 #endif
197
198 lastentry = nametable + entrysize * (top - 1);
199 bot = 0;
200 while (top > bot)
201 {
202 int mid = (top + bot) / 2;
203 pcre_uchar *entry = nametable + entrysize*mid;
204 int c = STRCMP_UC_UC((pcre_uchar *)stringname,
205 (pcre_uchar *)(entry + IMM2_SIZE));
206 if (c == 0)
207 {
208 pcre_uchar *first = entry;
209 pcre_uchar *last = entry;
210 while (first > nametable)
211 {
212 if (STRCMP_UC_UC((pcre_uchar *)stringname,
213 (pcre_uchar *)(first - entrysize + IMM2_SIZE)) != 0) break;
214 first -= entrysize;
215 }
216 while (last < lastentry)
217 {
218 if (STRCMP_UC_UC((pcre_uchar *)stringname,
219 (pcre_uchar *)(last + entrysize + IMM2_SIZE)) != 0) break;
220 last += entrysize;
221 }
222 #if defined COMPILE_PCRE8
223 *firstptr = (char *)first;
224 *lastptr = (char *)last;
225 #elif defined COMPILE_PCRE16
226 *firstptr = (PCRE_UCHAR16 *)first;
227 *lastptr = (PCRE_UCHAR16 *)last;
228 #elif defined COMPILE_PCRE32
229 *firstptr = (PCRE_UCHAR32 *)first;
230 *lastptr = (PCRE_UCHAR32 *)last;
231 #endif
232 return entrysize;
233 }
234 if (c > 0) bot = mid + 1; else top = mid;
235 }
236
237 return PCRE_ERROR_NOSUBSTRING;
238 }
239
240
241
242 /*************************************************
243 * Find first set of multiple named strings *
244 *************************************************/
245
246 /* This function allows for duplicate names in the table of named substrings.
247 It returns the number of the first one that was set in a pattern match.
248
249 Arguments:
250 code the compiled regex
251 stringname the name of the capturing substring
252 ovector the vector of matched substrings
253
254 Returns: the number of the first that is set,
255 or the number of the last one if none are set,
256 or a negative number on error
257 */
258
259 #if defined COMPILE_PCRE8
260 static int
261 get_first_set(const pcre *code, const char *stringname, int *ovector)
262 #elif defined COMPILE_PCRE16
263 static int
264 get_first_set(const pcre16 *code, PCRE_SPTR16 stringname, int *ovector)
265 #elif defined COMPILE_PCRE32
266 static int
267 get_first_set(const pcre32 *code, PCRE_SPTR32 stringname, int *ovector)
268 #endif
269 {
270 const REAL_PCRE *re = (const REAL_PCRE *)code;
271 int entrysize;
272 pcre_uchar *entry;
273 #if defined COMPILE_PCRE8
274 char *first, *last;
275 #elif defined COMPILE_PCRE16
276 PCRE_UCHAR16 *first, *last;
277 #elif defined COMPILE_PCRE32
278 PCRE_UCHAR32 *first, *last;
279 #endif
280
281 #if defined COMPILE_PCRE8
282 if ((re->options & PCRE_DUPNAMES) == 0 && (re->flags & PCRE_JCHANGED) == 0)
283 return pcre_get_stringnumber(code, stringname);
284 entrysize = pcre_get_stringtable_entries(code, stringname, &first, &last);
285 #elif defined COMPILE_PCRE16
286 if ((re->options & PCRE_DUPNAMES) == 0 && (re->flags & PCRE_JCHANGED) == 0)
287 return pcre16_get_stringnumber(code, stringname);
288 entrysize = pcre16_get_stringtable_entries(code, stringname, &first, &last);
289 #elif defined COMPILE_PCRE32
290 if ((re->options & PCRE_DUPNAMES) == 0 && (re->flags & PCRE_JCHANGED) == 0)
291 return pcre32_get_stringnumber(code, stringname);
292 entrysize = pcre32_get_stringtable_entries(code, stringname, &first, &last);
293 #endif
294 if (entrysize <= 0) return entrysize;
295 for (entry = (pcre_uchar *)first; entry <= (pcre_uchar *)last; entry += entrysize)
296 {
297 int n = GET2(entry, 0);
298 if (ovector[n*2] >= 0) return n;
299 }
300 return GET2(entry, 0);
301 }
302
303
304
305
306 /*************************************************
307 * Copy captured string to given buffer *
308 *************************************************/
309
310 /* This function copies a single captured substring into a given buffer.
311 Note that we use memcpy() rather than strncpy() in case there are binary zeros
312 in the string.
313
314 Arguments:
315 subject the subject string that was matched
316 ovector pointer to the offsets table
317 stringcount the number of substrings that were captured
318 (i.e. the yield of the pcre_exec call, unless
319 that was zero, in which case it should be 1/3
320 of the offset table size)
321 stringnumber the number of the required substring
322 buffer where to put the substring
323 size the size of the buffer
324
325 Returns: if successful:
326 the length of the copied string, not including the zero
327 that is put on the end; can be zero
328 if not successful:
329 PCRE_ERROR_NOMEMORY (-6) buffer too small
330 PCRE_ERROR_NOSUBSTRING (-7) no such captured substring
331 */
332
333 #if defined COMPILE_PCRE8
334 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
335 pcre_copy_substring(const char *subject, int *ovector, int stringcount,
336 int stringnumber, char *buffer, int size)
337 #elif defined COMPILE_PCRE16
338 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
339 pcre16_copy_substring(PCRE_SPTR16 subject, int *ovector, int stringcount,
340 int stringnumber, PCRE_UCHAR16 *buffer, int size)
341 #elif defined COMPILE_PCRE32
342 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
343 pcre32_copy_substring(PCRE_SPTR32 subject, int *ovector, int stringcount,
344 int stringnumber, PCRE_UCHAR32 *buffer, int size)
345 #endif
346 {
347 int yield;
348 if (stringnumber < 0 || stringnumber >= stringcount)
349 return PCRE_ERROR_NOSUBSTRING;
350 stringnumber *= 2;
351 yield = ovector[stringnumber+1] - ovector[stringnumber];
352 if (size < yield + 1) return PCRE_ERROR_NOMEMORY;
353 memcpy(buffer, subject + ovector[stringnumber], IN_UCHARS(yield));
354 buffer[yield] = 0;
355 return yield;
356 }
357
358
359
360 /*************************************************
361 * Copy named captured string to given buffer *
362 *************************************************/
363
364 /* This function copies a single captured substring into a given buffer,
365 identifying it by name. If the regex permits duplicate names, the first
366 substring that is set is chosen.
367
368 Arguments:
369 code the compiled regex
370 subject the subject string that was matched
371 ovector pointer to the offsets table
372 stringcount the number of substrings that were captured
373 (i.e. the yield of the pcre_exec call, unless
374 that was zero, in which case it should be 1/3
375 of the offset table size)
376 stringname the name of the required substring
377 buffer where to put the substring
378 size the size of the buffer
379
380 Returns: if successful:
381 the length of the copied string, not including the zero
382 that is put on the end; can be zero
383 if not successful:
384 PCRE_ERROR_NOMEMORY (-6) buffer too small
385 PCRE_ERROR_NOSUBSTRING (-7) no such captured substring
386 */
387
388 #if defined COMPILE_PCRE8
389 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
390 pcre_copy_named_substring(const pcre *code, const char *subject,
391 int *ovector, int stringcount, const char *stringname,
392 char *buffer, int size)
393 #elif defined COMPILE_PCRE16
394 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
395 pcre16_copy_named_substring(const pcre16 *code, PCRE_SPTR16 subject,
396 int *ovector, int stringcount, PCRE_SPTR16 stringname,
397 PCRE_UCHAR16 *buffer, int size)
398 #elif defined COMPILE_PCRE32
399 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
400 pcre32_copy_named_substring(const pcre32 *code, PCRE_SPTR32 subject,
401 int *ovector, int stringcount, PCRE_SPTR32 stringname,
402 PCRE_UCHAR32 *buffer, int size)
403 #endif
404 {
405 int n = get_first_set(code, stringname, ovector);
406 if (n <= 0) return n;
407 #if defined COMPILE_PCRE8
408 return pcre_copy_substring(subject, ovector, stringcount, n, buffer, size);
409 #elif defined COMPILE_PCRE16
410 return pcre16_copy_substring(subject, ovector, stringcount, n, buffer, size);
411 #elif defined COMPILE_PCRE32
412 return pcre32_copy_substring(subject, ovector, stringcount, n, buffer, size);
413 #endif
414 }
415
416
417
418 /*************************************************
419 * Copy all captured strings to new store *
420 *************************************************/
421
422 /* This function gets one chunk of store and builds a list of pointers and all
423 of the captured substrings in it. A NULL pointer is put on the end of the list.
424
425 Arguments:
426 subject the subject string that was matched
427 ovector pointer to the offsets table
428 stringcount the number of substrings that were captured
429 (i.e. the yield of the pcre_exec call, unless
430 that was zero, in which case it should be 1/3
431 of the offset table size)
432 listptr set to point to the list of pointers
433
434 Returns: if successful: 0
435 if not successful:
436 PCRE_ERROR_NOMEMORY (-6) failed to get store
437 */
438
439 #if defined COMPILE_PCRE8
440 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
441 pcre_get_substring_list(const char *subject, int *ovector, int stringcount,
442 const char ***listptr)
443 #elif defined COMPILE_PCRE16
444 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
445 pcre16_get_substring_list(PCRE_SPTR16 subject, int *ovector, int stringcount,
446 PCRE_SPTR16 **listptr)
447 #elif defined COMPILE_PCRE32
448 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
449 pcre32_get_substring_list(PCRE_SPTR32 subject, int *ovector, int stringcount,
450 PCRE_SPTR32 **listptr)
451 #endif
452 {
453 int i;
454 int size = sizeof(pcre_uchar *);
455 int double_count = stringcount * 2;
456 pcre_uchar **stringlist;
457 pcre_uchar *p;
458
459 for (i = 0; i < double_count; i += 2)
460 size += sizeof(pcre_uchar *) + IN_UCHARS(ovector[i+1] - ovector[i] + 1);
461
462 stringlist = (pcre_uchar **)(PUBL(malloc))(size);
463 if (stringlist == NULL) return PCRE_ERROR_NOMEMORY;
464
465 #if defined COMPILE_PCRE8
466 *listptr = (const char **)stringlist;
467 #elif defined COMPILE_PCRE16
468 *listptr = (PCRE_SPTR16 *)stringlist;
469 #elif defined COMPILE_PCRE32
470 *listptr = (PCRE_SPTR32 *)stringlist;
471 #endif
472 p = (pcre_uchar *)(stringlist + stringcount + 1);
473
474 for (i = 0; i < double_count; i += 2)
475 {
476 int len = ovector[i+1] - ovector[i];
477 memcpy(p, subject + ovector[i], IN_UCHARS(len));
478 *stringlist++ = p;
479 p += len;
480 *p++ = 0;
481 }
482
483 *stringlist = NULL;
484 return 0;
485 }
486
487
488
489 /*************************************************
490 * Free store obtained by get_substring_list *
491 *************************************************/
492
493 /* This function exists for the benefit of people calling PCRE from non-C
494 programs that can call its functions, but not free() or (PUBL(free))()
495 directly.
496
497 Argument: the result of a previous pcre_get_substring_list()
498 Returns: nothing
499 */
500
501 #if defined COMPILE_PCRE8
502 PCRE_EXP_DEFN void PCRE_CALL_CONVENTION
503 pcre_free_substring_list(const char **pointer)
504 #elif defined COMPILE_PCRE16
505 PCRE_EXP_DEFN void PCRE_CALL_CONVENTION
506 pcre16_free_substring_list(PCRE_SPTR16 *pointer)
507 #elif defined COMPILE_PCRE32
508 PCRE_EXP_DEFN void PCRE_CALL_CONVENTION
509 pcre32_free_substring_list(PCRE_SPTR32 *pointer)
510 #endif
511 {
512 (PUBL(free))((void *)pointer);
513 }
514
515
516
517 /*************************************************
518 * Copy captured string to new store *
519 *************************************************/
520
521 /* This function copies a single captured substring into a piece of new
522 store
523
524 Arguments:
525 subject the subject string that was matched
526 ovector pointer to the offsets table
527 stringcount the number of substrings that were captured
528 (i.e. the yield of the pcre_exec call, unless
529 that was zero, in which case it should be 1/3
530 of the offset table size)
531 stringnumber the number of the required substring
532 stringptr where to put a pointer to the substring
533
534 Returns: if successful:
535 the length of the string, not including the zero that
536 is put on the end; can be zero
537 if not successful:
538 PCRE_ERROR_NOMEMORY (-6) failed to get store
539 PCRE_ERROR_NOSUBSTRING (-7) substring not present
540 */
541
542 #if defined COMPILE_PCRE8
543 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
544 pcre_get_substring(const char *subject, int *ovector, int stringcount,
545 int stringnumber, const char **stringptr)
546 #elif defined COMPILE_PCRE16
547 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
548 pcre16_get_substring(PCRE_SPTR16 subject, int *ovector, int stringcount,
549 int stringnumber, PCRE_SPTR16 *stringptr)
550 #elif defined COMPILE_PCRE32
551 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
552 pcre32_get_substring(PCRE_SPTR32 subject, int *ovector, int stringcount,
553 int stringnumber, PCRE_SPTR32 *stringptr)
554 #endif
555 {
556 int yield;
557 pcre_uchar *substring;
558 if (stringnumber < 0 || stringnumber >= stringcount)
559 return PCRE_ERROR_NOSUBSTRING;
560 stringnumber *= 2;
561 yield = ovector[stringnumber+1] - ovector[stringnumber];
562 substring = (pcre_uchar *)(PUBL(malloc))(IN_UCHARS(yield + 1));
563 if (substring == NULL) return PCRE_ERROR_NOMEMORY;
564 memcpy(substring, subject + ovector[stringnumber], IN_UCHARS(yield));
565 substring[yield] = 0;
566 #if defined COMPILE_PCRE8
567 *stringptr = (const char *)substring;
568 #elif defined COMPILE_PCRE16
569 *stringptr = (PCRE_SPTR16)substring;
570 #elif defined COMPILE_PCRE32
571 *stringptr = (PCRE_SPTR32)substring;
572 #endif
573 return yield;
574 }
575
576
577
578 /*************************************************
579 * Copy named captured string to new store *
580 *************************************************/
581
582 /* This function copies a single captured substring, identified by name, into
583 new store. If the regex permits duplicate names, the first substring that is
584 set is chosen.
585
586 Arguments:
587 code the compiled regex
588 subject the subject string that was matched
589 ovector pointer to the offsets table
590 stringcount the number of substrings that were captured
591 (i.e. the yield of the pcre_exec call, unless
592 that was zero, in which case it should be 1/3
593 of the offset table size)
594 stringname the name of the required substring
595 stringptr where to put the pointer
596
597 Returns: if successful:
598 the length of the copied string, not including the zero
599 that is put on the end; can be zero
600 if not successful:
601 PCRE_ERROR_NOMEMORY (-6) couldn't get memory
602 PCRE_ERROR_NOSUBSTRING (-7) no such captured substring
603 */
604
605 #if defined COMPILE_PCRE8
606 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
607 pcre_get_named_substring(const pcre *code, const char *subject,
608 int *ovector, int stringcount, const char *stringname,
609 const char **stringptr)
610 #elif defined COMPILE_PCRE16
611 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
612 pcre16_get_named_substring(const pcre16 *code, PCRE_SPTR16 subject,
613 int *ovector, int stringcount, PCRE_SPTR16 stringname,
614 PCRE_SPTR16 *stringptr)
615 #elif defined COMPILE_PCRE32
616 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
617 pcre32_get_named_substring(const pcre32 *code, PCRE_SPTR32 subject,
618 int *ovector, int stringcount, PCRE_SPTR32 stringname,
619 PCRE_SPTR32 *stringptr)
620 #endif
621 {
622 int n = get_first_set(code, stringname, ovector);
623 if (n <= 0) return n;
624 #if defined COMPILE_PCRE8
625 return pcre_get_substring(subject, ovector, stringcount, n, stringptr);
626 #elif defined COMPILE_PCRE16
627 return pcre16_get_substring(subject, ovector, stringcount, n, stringptr);
628 #elif defined COMPILE_PCRE32
629 return pcre32_get_substring(subject, ovector, stringcount, n, stringptr);
630 #endif
631 }
632
633
634
635
636 /*************************************************
637 * Free store obtained by get_substring *
638 *************************************************/
639
640 /* This function exists for the benefit of people calling PCRE from non-C
641 programs that can call its functions, but not free() or (PUBL(free))()
642 directly.
643
644 Argument: the result of a previous pcre_get_substring()
645 Returns: nothing
646 */
647
648 #if defined COMPILE_PCRE8
649 PCRE_EXP_DEFN void PCRE_CALL_CONVENTION
650 pcre_free_substring(const char *pointer)
651 #elif defined COMPILE_PCRE16
652 PCRE_EXP_DEFN void PCRE_CALL_CONVENTION
653 pcre16_free_substring(PCRE_SPTR16 pointer)
654 #elif defined COMPILE_PCRE32
655 PCRE_EXP_DEFN void PCRE_CALL_CONVENTION
656 pcre32_free_substring(PCRE_SPTR32 pointer)
657 #endif
658 {
659 (PUBL(free))((void *)pointer);
660 }
661
662 /* End of pcre_get.c */

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