/[pcre]/code/trunk/pcreposix.c
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revision 7 by nigel, Sat Feb 24 21:38:09 2007 UTC revision 91 by nigel, Sat Feb 24 21:41:34 2007 UTC
# Line 2  Line 2 
2  *      Perl-Compatible Regular Expressions       *  *      Perl-Compatible Regular Expressions       *
3  *************************************************/  *************************************************/
4    
5  /*  /* PCRE is a library of functions to support regular expressions whose syntax
6  This is a library of functions to support regular expressions whose syntax  and semantics are as close as possible to those of the Perl 5 language.
 and semantics are as close as possible to those of the Perl 5 language. See  
 the file Tech.Notes for some information on the internals.  
   
 This module is a wrapper that provides a POSIX API to the underlying PCRE  
 functions.  
7    
8  Written by: Philip Hazel <ph10@cam.ac.uk>                         Written by Philip Hazel
9               Copyright (c) 1997-2006 University of Cambridge
            Copyright (c) 1997 University of Cambridge  
10    
11  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
12  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
13  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.  
14    
15  2. The origin of this software must not be misrepresented, either by      * Redistributions of source code must retain the above copyright notice,
16     explicit claim or by omission.        this list of conditions and the following disclaimer.
17    
18  3. Altered versions must be plainly marked as such, and must not be      * Redistributions in binary form must reproduce the above copyright
19     misrepresented as being the original software.        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  #include "internal.h"  
41    /* This module is a wrapper that provides a POSIX API to the underlying PCRE
42    functions. */
43    
44    
45    #include "pcre_internal.h"
46  #include "pcreposix.h"  #include "pcreposix.h"
47  #include "stdlib.h"  #include "stdlib.h"
48    
49    
50    
51  /* Corresponding tables of PCRE error messages and POSIX error codes. */  /* Table to translate PCRE compile time error codes into POSIX error codes. */
52    
53  static const char *estring[] = {  static const int eint[] = {
54    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,    0,           /* no error */
55    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,    REG_EESCAPE, /* \ at end of pattern */
56    ERR21, ERR22, ERR23 };    REG_EESCAPE, /* \c at end of pattern */
57      REG_EESCAPE, /* unrecognized character follows \ */
58  static int eint[] = {    REG_BADBR,   /* numbers out of order in {} quantifier */
59    REG_EESCAPE, /* "\\ at end of pattern" */    REG_BADBR,   /* number too big in {} quantifier */
60    REG_EESCAPE, /* "\\c at end of pattern" */    REG_EBRACK,  /* missing terminating ] for character class */
61    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_ECTYPE,  /* invalid escape sequence in character class */
62    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_ERANGE,  /* range out of order in character class */
63    REG_BADBR,   /* "number too big in {} quantifier" */    REG_BADRPT,  /* nothing to repeat */
64    REG_EBRACK,  /* "missing terminating ] for character class" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
65    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_ASSERT,  /* internal error: unexpected repeat */
66    REG_ERANGE,  /* "range out of order in character class" */    REG_BADPAT,  /* unrecognized character after (? */
67    REG_BADRPT,  /* "nothing to repeat" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
68    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_EPAREN,  /* missing ) */
69    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_ESUBREG, /* reference to non-existent subpattern */
70    REG_BADPAT,  /* "unrecognized character after (?" */    REG_INVARG,  /* erroffset passed as NULL */
71    REG_ESIZE,   /* "too many capturing parenthesized sub-patterns" */    REG_INVARG,  /* unknown option bit(s) set */
72    REG_EPAREN,  /* "missing )" */    REG_EPAREN,  /* missing ) after comment */
73    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_ESIZE,   /* parentheses nested too deeply */
74    REG_INVARG,  /* "erroffset passed as NULL" */    REG_ESIZE,   /* regular expression too large */
75    REG_INVARG,  /* "unknown option bit(s) set" */    REG_ESPACE,  /* failed to get memory */
76    REG_EPAREN,  /* "missing ) after comment" */    REG_EPAREN,  /* unmatched brackets */
77    REG_ESIZE,   /* "too many sets of parentheses" */    REG_ASSERT,  /* internal error: code overflow */
78    REG_ESIZE,   /* "regular expression too large" */    REG_BADPAT,  /* unrecognized character after (?< */
79    REG_ESPACE,  /* "failed to get memory" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
80    REG_EPAREN,  /* "unmatched brackets" */    REG_BADPAT,  /* malformed number or name after (?( */
81    REG_ASSERT   /* "internal error: code overflow" */    REG_BADPAT,  /* conditional group containe more than two branches */
82      REG_BADPAT,  /* assertion expected after (?( */
83      REG_BADPAT,  /* (?R or (?digits must be followed by ) */
84      REG_ECTYPE,  /* unknown POSIX class name */
85      REG_BADPAT,  /* POSIX collating elements are not supported */
86      REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
87      REG_BADPAT,  /* spare error */
88      REG_BADPAT,  /* character value in \x{...} sequence is too large */
89      REG_BADPAT,  /* invalid condition (?(0) */
90      REG_BADPAT,  /* \C not allowed in lookbehind assertion */
91      REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
92      REG_BADPAT,  /* number after (?C is > 255 */
93      REG_BADPAT,  /* closing ) for (?C expected */
94      REG_BADPAT,  /* recursive call could loop indefinitely */
95      REG_BADPAT,  /* unrecognized character after (?P */
96      REG_BADPAT,  /* syntax error after (?P */
97      REG_BADPAT,  /* two named subpatterns have the same name */
98      REG_BADPAT,  /* invalid UTF-8 string */
99      REG_BADPAT,  /* support for \P, \p, and \X has not been compiled */
100      REG_BADPAT,  /* malformed \P or \p sequence */
101      REG_BADPAT,  /* unknown property name after \P or \p */
102      REG_BADPAT,  /* subpattern name is too long (maximum 32 characters) */
103      REG_BADPAT,  /* too many named subpatterns (maximum 10,000) */
104      REG_BADPAT,  /* repeated subpattern is too long */
105      REG_BADPAT   /* octal value is greater than \377 (not in UTF-8 mode) */
106  };  };
107    
108  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
109    
110  static const char *pstring[] = {  static const char *const pstring[] = {
111    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
112    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
113    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 97  static const char *pstring[] = { Line 132  static const char *pstring[] = {
132    
133    
134  /*************************************************  /*************************************************
 *          Translate PCRE text code to int       *  
 *************************************************/  
   
 /* PCRE compile-time errors are given as strings defined as macros. We can just  
 look them up in a table to turn them into POSIX-style error codes. */  
   
 static int  
 pcre_posix_error_code(const char *s)  
 {  
 size_t i;  
 for (i = 0; i < sizeof(estring)/sizeof(char *); i++)  
   if (strcmp(s, estring[i]) == 0) return eint[i];  
 return REG_ASSERT;  
 }  
   
   
   
 /*************************************************  
135  *          Translate error code to string        *  *          Translate error code to string        *
136  *************************************************/  *************************************************/
137    
138  size_t  PCRE_DATA_SCOPE size_t
139  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)
140  {  {
141  const char *message, *addmessage;  const char *message, *addmessage;
# Line 135  addlength = (preg != NULL && (int)preg-> Line 152  addlength = (preg != NULL && (int)preg->
152  if (errbuf_size > 0)  if (errbuf_size > 0)
153    {    {
154    if (addlength > 0 && errbuf_size >= length + addlength)    if (addlength > 0 && errbuf_size >= length + addlength)
155      sprintf(errbuf, "%s%s%-6d", message, addmessage, preg->re_erroffset);      sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
156    else    else
157      {      {
158      strncpy(errbuf, message, errbuf_size - 1);      strncpy(errbuf, message, errbuf_size - 1);
# Line 153  return length + addlength; Line 170  return length + addlength;
170  *           Free store held by a regex           *  *           Free store held by a regex           *
171  *************************************************/  *************************************************/
172    
173  void  PCRE_DATA_SCOPE void
174  regfree(regex_t *preg)  regfree(regex_t *preg)
175  {  {
176  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 176  Returns:      0 on success Line 193  Returns:      0 on success
193                various non-zero codes on failure                various non-zero codes on failure
194  */  */
195    
196  int  PCRE_DATA_SCOPE int
197  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
198  {  {
199  const char *errorptr;  const char *errorptr;
200  int erroffset;  int erroffset;
201    int errorcode;
202  int options = 0;  int options = 0;
203    
204  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)   options |= PCRE_CASELESS;
205  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
206    if ((cflags & REG_DOTALL) != 0)  options |= PCRE_DOTALL;
207    if ((cflags & REG_NOSUB) != 0)   options |= PCRE_NO_AUTO_CAPTURE;
208    if ((cflags & REG_UTF8) != 0)    options |= PCRE_UTF8;
209    
210  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
211      &erroffset, NULL);
212  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
213    
214  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  if (preg->re_pcre == NULL) return eint[errorcode];
215    
216  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
217  return 0;  return 0;
218  }  }
219    
# Line 202  return 0; Line 224  return 0;
224  *              Match a regular expression        *  *              Match a regular expression        *
225  *************************************************/  *************************************************/
226    
227  int  /* Unfortunately, PCRE requires 3 ints of working space for each captured
228  regexec(regex_t *preg, const char *string, size_t nmatch,  substring, so we have to get and release working store instead of just using
229    the POSIX structures as was done in earlier releases when PCRE needed only 2
230    ints. However, if the number of possible capturing brackets is small, use a
231    block of store on the stack, to reduce the use of malloc/free. The threshold is
232    in a macro that can be changed at configure time.
233    
234    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
235    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
236    the only result is yes/no/error. */
237    
238    PCRE_DATA_SCOPE int
239    regexec(const 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    BOOL nosub =
248      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
249    
250  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
251  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
252    
253  preg->re_erroffset = -1;   /* Only has meaning after compile */  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
254    
255  rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), options,  /* When no string data is being returned, ensure that nmatch is zero.
256    (int *)pmatch, nmatch * 2);  Otherwise, ensure the vector for holding the return data is large enough. */
257    
258  if (rc == 0) return 0;    /* All pmatch were filled in */  if (nosub) nmatch = 0;
259    
260  if (rc > 0)  else if (nmatch > 0)
261      {
262      if (nmatch <= POSIX_MALLOC_THRESHOLD)
263        {
264        ovector = &(small_ovector[0]);
265        }
266      else
267        {
268        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
269        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
270        if (ovector == NULL) return REG_ESPACE;
271        allocated_ovector = TRUE;
272        }
273      }
274    
275    rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
276      0, options, ovector, nmatch * 3);
277    
278    if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
279    
280    if (rc >= 0)
281    {    {
282    size_t i;    size_t i;
283    for (i = rc; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;    if (!nosub)
284        {
285        for (i = 0; i < (size_t)rc; i++)
286          {
287          pmatch[i].rm_so = ovector[i*2];
288          pmatch[i].rm_eo = ovector[i*2+1];
289          }
290        if (allocated_ovector) free(ovector);
291        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
292        }
293    return 0;    return 0;
294    }    }
295    
296  else switch(rc)  else
297    {    {
298    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    if (allocated_ovector) free(ovector);
299    case PCRE_ERROR_BADREF: return REG_ESUBREG;    switch(rc)
300    case PCRE_ERROR_NULL: return REG_INVARG;      {
301    case PCRE_ERROR_BADOPTION: return REG_INVARG;      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
302    case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_NULL: return REG_INVARG;
303    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_BADOPTION: return REG_INVARG;
304    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
305    default: return REG_ASSERT;      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
306        case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
307        case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
308        case PCRE_ERROR_BADUTF8: return REG_INVARG;
309        case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
310        default: return REG_ASSERT;
311        }
312    }    }
313  }  }
314    

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