/[pcre]/code/trunk/pcreposix.c
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revision 23 by nigel, Sat Feb 24 21:38:41 2007 UTC revision 75 by nigel, Sat Feb 24 21:40:37 2007 UTC
# Line 12  functions. Line 12  functions.
12    
13  Written by: Philip Hazel <ph10@cam.ac.uk>  Written by: Philip Hazel <ph10@cam.ac.uk>
14    
15             Copyright (c) 1998 University of Cambridge             Copyright (c) 1997-2004 University of Cambridge
16    
17  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
18  Permission is granted to anyone to use this software for any purpose on any  Redistribution and use in source and binary forms, with or without
19  computer system, and to redistribute it freely, subject to the following  modification, are permitted provided that the following conditions are met:
 restrictions:  
   
 1. This software is distributed in the hope that it will be useful,  
    but WITHOUT ANY WARRANTY; without even the implied warranty of  
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
20    
21  2. The origin of this software must not be misrepresented, either by      * Redistributions of source code must retain the above copyright notice,
22     explicit claim or by omission.        this list of conditions and the following disclaimer.
23    
24  3. Altered versions must be plainly marked as such, and must not be      * Redistributions in binary form must reproduce the above copyright
25     misrepresented as being the original software.        notice, this list of conditions and the following disclaimer in the
26          documentation and/or other materials provided with the distribution.
27    
28        * Neither the name of the University of Cambridge nor the names of its
29          contributors may be used to endorse or promote products derived from
30          this software without specific prior written permission.
31    
32    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
33    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
34    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
35    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
36    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
37    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
38    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
39    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
40    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
41    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42    POSSIBILITY OF SUCH DAMAGE.
43  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
44  */  */
45    
# Line 39  restrictions: Line 51  restrictions:
51    
52  /* Corresponding tables of PCRE error messages and POSIX error codes. */  /* Corresponding tables of PCRE error messages and POSIX error codes. */
53    
54  static const char *estring[] = {  static const char *const estring[] = {
55    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,
56    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,
57    ERR21, ERR22, ERR23, ERR24, ERR25 };    ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,
58      ERR31, ERR32, ERR33, ERR34, ERR35, ERR36, ERR37, ERR38, ERR39, ERR40,
59      ERR41, ERR42, ERR43, ERR44, ERR45, ERR46, ERR47 };
60    
61  static int eint[] = {  static const int eint[] = {
62    REG_EESCAPE, /* "\\ at end of pattern" */    REG_EESCAPE, /* "\\ at end of pattern" */
63    REG_EESCAPE, /* "\\c at end of pattern" */    REG_EESCAPE, /* "\\c at end of pattern" */
64    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_EESCAPE, /* "unrecognized character follows \\" */
# Line 57  static int eint[] = { Line 71  static int eint[] = {
71    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */
72    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_ASSERT,  /* "internal error: unexpected repeat" */
73    REG_BADPAT,  /* "unrecognized character after (?" */    REG_BADPAT,  /* "unrecognized character after (?" */
74    REG_ESIZE,   /* "too many capturing parenthesized sub-patterns" */    REG_BADPAT,  /* "POSIX named classes are supported only within a class" */
75    REG_EPAREN,  /* "missing )" */    REG_EPAREN,  /* "missing )" */
76    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_ESUBREG, /* "reference to non-existent subpattern" */
77    REG_INVARG,  /* "erroffset passed as NULL" */    REG_INVARG,  /* "erroffset passed as NULL" */
78    REG_INVARG,  /* "unknown option bit(s) set" */    REG_INVARG,  /* "unknown option bit(s) set" */
79    REG_EPAREN,  /* "missing ) after comment" */    REG_EPAREN,  /* "missing ) after comment" */
80    REG_ESIZE,   /* "too many sets of parentheses" */    REG_ESIZE,   /* "parentheses nested too deeply" */
81    REG_ESIZE,   /* "regular expression too large" */    REG_ESIZE,   /* "regular expression too large" */
82    REG_ESPACE,  /* "failed to get memory" */    REG_ESPACE,  /* "failed to get memory" */
83    REG_EPAREN,  /* "unmatched brackets" */    REG_EPAREN,  /* "unmatched brackets" */
# Line 72  static int eint[] = { Line 86  static int eint[] = {
86    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */
87    REG_BADPAT,  /* "malformed number after (?(" */    REG_BADPAT,  /* "malformed number after (?(" */
88    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_BADPAT,  /* "conditional group containe more than two branches" */
89    REG_BADPAT   /* "assertion expected after (?(" */    REG_BADPAT,  /* "assertion expected after (?(" */
90      REG_BADPAT,  /* "(?R or (?digits must be followed by )" */
91      REG_ECTYPE,  /* "unknown POSIX class name" */
92      REG_BADPAT,  /* "POSIX collating elements are not supported" */
93      REG_INVARG,  /* "this version of PCRE is not compiled with PCRE_UTF8 support" */
94      REG_BADPAT,  /* "spare error" */
95      REG_BADPAT,  /* "character value in \x{...} sequence is too large" */
96      REG_BADPAT,  /* "invalid condition (?(0)" */
97      REG_BADPAT,  /* "\\C not allowed in lookbehind assertion" */
98      REG_EESCAPE, /* "PCRE does not support \\L, \\l, \\N, \\U, or \\u" */
99      REG_BADPAT,  /* "number after (?C is > 255" */
100      REG_BADPAT,  /* "closing ) for (?C expected" */
101      REG_BADPAT,  /* "recursive call could loop indefinitely" */
102      REG_BADPAT,  /* "unrecognized character after (?P" */
103      REG_BADPAT,  /* "syntax error after (?P" */
104      REG_BADPAT,  /* "two named groups have the same name" */
105      REG_BADPAT,  /* "invalid UTF-8 string" */
106      REG_BADPAT,  /* "support for \\P, \\p, and \\X has not been compiled" */
107      REG_BADPAT,  /* "malformed \\P or \\p sequence" */
108      REG_BADPAT   /* "unknown property name after \\P or \\p" */
109  };  };
110    
111  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
112    
113  static const char *pstring[] = {  static const char *const pstring[] = {
114    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
115    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
116    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 123  return REG_ASSERT; Line 156  return REG_ASSERT;
156  *          Translate error code to string        *  *          Translate error code to string        *
157  *************************************************/  *************************************************/
158    
159  size_t  EXPORT size_t
160  regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)  regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
161  {  {
162  const char *message, *addmessage;  const char *message, *addmessage;
# Line 158  return length + addlength; Line 191  return length + addlength;
191  *           Free store held by a regex           *  *           Free store held by a regex           *
192  *************************************************/  *************************************************/
193    
194  void  EXPORT void
195  regfree(regex_t *preg)  regfree(regex_t *preg)
196  {  {
197  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 181  Returns: 0 on success Line 214  Returns: 0 on success
214                various non-zero codes on failure                various non-zero codes on failure
215  */  */
216    
217  int  EXPORT int
218  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
219  {  {
220  const char *errorptr;  const char *errorptr;
# Line 191  int options = 0; Line 224  int options = 0;
224  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
225  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
226    
227  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset);  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);
228  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
229    
230  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);
231    
232  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
233  return 0;  return 0;
234  }  }
235    
# Line 207  return 0; Line 240  return 0;
240  *              Match a regular expression        *  *              Match a regular expression        *
241  *************************************************/  *************************************************/
242    
243  int  /* Unfortunately, PCRE requires 3 ints of working space for each captured
244  regexec(regex_t *preg, const char *string, size_t nmatch,  substring, so we have to get and release working store instead of just using
245    the POSIX structures as was done in earlier releases when PCRE needed only 2
246    ints. However, if the number of possible capturing brackets is small, use a
247    block of store on the stack, to reduce the use of malloc/free. The threshold is
248    in a macro that can be changed at configure time. */
249    
250    EXPORT int
251    regexec(const regex_t *preg, const char *string, size_t nmatch,
252    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
253  {  {
254  int rc;  int rc;
255  int options = 0;  int options = 0;
256    int *ovector = NULL;
257    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
258    BOOL allocated_ovector = FALSE;
259    
260  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
261  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
262    
263  preg->re_erroffset = (size_t)(-1);   /* Only has meaning after compile */  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
264    
265  rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), options,  if (nmatch > 0)
266    (int *)pmatch, nmatch * 2);    {
267      if (nmatch <= POSIX_MALLOC_THRESHOLD)
268        {
269        ovector = &(small_ovector[0]);
270        }
271      else
272        {
273        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
274        if (ovector == NULL) return REG_ESPACE;
275        allocated_ovector = TRUE;
276        }
277      }
278    
279    rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
280      0, options, ovector, nmatch * 3);
281    
282  if (rc == 0) return 0;    /* All pmatch were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
283    
284  if (rc > 0)  if (rc >= 0)
285    {    {
286    size_t i;    size_t i;
287    for (i = rc; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;    for (i = 0; i < (size_t)rc; i++)
288        {
289        pmatch[i].rm_so = ovector[i*2];
290        pmatch[i].rm_eo = ovector[i*2+1];
291        }
292      if (allocated_ovector) free(ovector);
293      for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
294    return 0;    return 0;
295    }    }
296    
297  else switch(rc)  else
298    {    {
299    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    if (allocated_ovector) free(ovector);
300    case PCRE_ERROR_NULL: return REG_INVARG;    switch(rc)
301    case PCRE_ERROR_BADOPTION: return REG_INVARG;      {
302    case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
303    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_NULL: return REG_INVARG;
304    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      case PCRE_ERROR_BADOPTION: return REG_INVARG;
305    default: return REG_ASSERT;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
306        case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
307        case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
308        case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
309        case PCRE_ERROR_BADUTF8: return REG_INVARG;
310        case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
311        default: return REG_ASSERT;
312        }
313    }    }
314  }  }
315    
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