/[pcre]/code/tags/pcre-4.3/pcreposix.c
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revision 25 by nigel, Sat Feb 24 21:38:45 2007 UTC revision 63 by nigel, Sat Feb 24 21:40:03 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) 1997-2003 University of Cambridge
16    
17  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
18  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 28  restrictions:
28    
29  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
30     misrepresented as being the original software.     misrepresented as being the original software.
31    
32    4. If PCRE is embedded in any software that is released under the GNU
33       General Purpose Licence (GPL), then the terms of that licence shall
34       supersede any condition above with which it is incompatible.
35  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
36  */  */
37    
# Line 42  restrictions: Line 46  restrictions:
46  static const char *estring[] = {  static const char *estring[] = {
47    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,
48    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,
49    ERR21, ERR22, ERR23, ERR24, ERR25 };    ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,
50      ERR31, ERR32, ERR33, ERR34, ERR35, ERR36, ERR37, ERR38, ERR39, ERR40,
51      ERR41, ERR42, ERR43 };
52    
53  static int eint[] = {  static int eint[] = {
54    REG_EESCAPE, /* "\\ at end of pattern" */    REG_EESCAPE, /* "\\ at end of pattern" */
# Line 57  static int eint[] = { Line 63  static int eint[] = {
63    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */
64    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_ASSERT,  /* "internal error: unexpected repeat" */
65    REG_BADPAT,  /* "unrecognized character after (?" */    REG_BADPAT,  /* "unrecognized character after (?" */
66    REG_ESIZE,   /* "too many capturing parenthesized sub-patterns" */    REG_BADPAT,  /* "POSIX named classes are supported only within a class" */
67    REG_EPAREN,  /* "missing )" */    REG_EPAREN,  /* "missing )" */
68    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_ESUBREG, /* "reference to non-existent subpattern" */
69    REG_INVARG,  /* "erroffset passed as NULL" */    REG_INVARG,  /* "erroffset passed as NULL" */
70    REG_INVARG,  /* "unknown option bit(s) set" */    REG_INVARG,  /* "unknown option bit(s) set" */
71    REG_EPAREN,  /* "missing ) after comment" */    REG_EPAREN,  /* "missing ) after comment" */
72    REG_ESIZE,   /* "too many sets of parentheses" */    REG_ESIZE,   /* "parentheses nested too deeply" */
73    REG_ESIZE,   /* "regular expression too large" */    REG_ESIZE,   /* "regular expression too large" */
74    REG_ESPACE,  /* "failed to get memory" */    REG_ESPACE,  /* "failed to get memory" */
75    REG_EPAREN,  /* "unmatched brackets" */    REG_EPAREN,  /* "unmatched brackets" */
# Line 72  static int eint[] = { Line 78  static int eint[] = {
78    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */
79    REG_BADPAT,  /* "malformed number after (?(" */    REG_BADPAT,  /* "malformed number after (?(" */
80    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_BADPAT,  /* "conditional group containe more than two branches" */
81    REG_BADPAT   /* "assertion expected after (?(" */    REG_BADPAT,  /* "assertion expected after (?(" */
82      REG_BADPAT,  /* "(?R or (?digits must be followed by )" */
83      REG_ECTYPE,  /* "unknown POSIX class name" */
84      REG_BADPAT,  /* "POSIX collating elements are not supported" */
85      REG_INVARG,  /* "this version of PCRE is not compiled with PCRE_UTF8 support" */
86      REG_BADPAT,  /* "spare error" */
87      REG_BADPAT,  /* "character value in \x{...} sequence is too large" */
88      REG_BADPAT,  /* "invalid condition (?(0)" */
89      REG_BADPAT,  /* "\\C not allowed in lookbehind assertion" */
90      REG_EESCAPE, /* "PCRE does not support \\L, \\l, \\N, \\P, \\p, \\U, \\u, or \\X" */
91      REG_BADPAT,  /* "number after (?C is > 255" */
92      REG_BADPAT,  /* "closing ) for (?C expected" */
93      REG_BADPAT,  /* "recursive call could loop indefinitely" */
94      REG_BADPAT,  /* "unrecognized character after (?P" */
95      REG_BADPAT,  /* "syntax error after (?P" */
96      REG_BADPAT   /* "two named groups have the same name" */
97  };  };
98    
99  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
# Line 207  return 0; Line 228  return 0;
228  *              Match a regular expression        *  *              Match a regular expression        *
229  *************************************************/  *************************************************/
230    
231    /* Unfortunately, PCRE requires 3 ints of working space for each captured
232    substring, so we have to get and release working store instead of just using
233    the POSIX structures as was done in earlier releases when PCRE needed only 2
234    ints. However, if the number of possible capturing brackets is small, use a
235    block of store on the stack, to reduce the use of malloc/free. The threshold is
236    in a macro that can be changed at configure time. */
237    
238  int  int
239  regexec(regex_t *preg, const char *string, size_t nmatch,  regexec(regex_t *preg, const char *string, size_t nmatch,
240    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
241  {  {
242  int rc;  int rc;
243  int options = 0;  int options = 0;
244    int *ovector = NULL;
245    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
246    BOOL allocated_ovector = FALSE;
247    
248  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
249  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
250    
251  preg->re_erroffset = (size_t)(-1);   /* Only has meaning after compile */  preg->re_erroffset = (size_t)(-1);   /* Only has meaning after compile */
252    
253  rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), options,  if (nmatch > 0)
254    (int *)pmatch, nmatch * 2);    {
255      if (nmatch <= POSIX_MALLOC_THRESHOLD)
256        {
257        ovector = &(small_ovector[0]);
258        }
259      else
260        {
261        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
262        if (ovector == NULL) return REG_ESPACE;
263        allocated_ovector = TRUE;
264        }
265      }
266    
267    rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), 0, options,
268      ovector, nmatch * 3);
269    
270  if (rc == 0) return 0;    /* All pmatch were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
271    
272  if (rc > 0)  if (rc >= 0)
273    {    {
274    size_t i;    size_t i;
275    for (i = rc; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;    for (i = 0; i < (size_t)rc; i++)
276        {
277        pmatch[i].rm_so = ovector[i*2];
278        pmatch[i].rm_eo = ovector[i*2+1];
279        }
280      if (allocated_ovector) free(ovector);
281      for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
282    return 0;    return 0;
283    }    }
284    
285  else switch(rc)  else
286    {    {
287    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    if (allocated_ovector) free(ovector);
288    case PCRE_ERROR_NULL: return REG_INVARG;    switch(rc)
289    case PCRE_ERROR_BADOPTION: return REG_INVARG;      {
290    case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
291    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_NULL: return REG_INVARG;
292    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      case PCRE_ERROR_BADOPTION: return REG_INVARG;
293    default: return REG_ASSERT;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
294        case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
295        case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
296        default: return REG_ASSERT;
297        }
298    }    }
299  }  }
300    
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