/[pcre]/code/trunk/pcreposix.c
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revision 23 by nigel, Sat Feb 24 21:38:41 2007 UTC revision 145 by ph10, Wed Apr 4 14:06:52 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) 1997-2007 University of Cambridge
            Copyright (c) 1998 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, ERR24, ERR25 };    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 contains more than two branches */
82    REG_BADPAT,  /* "unrecognized character after (?<" */    REG_BADPAT,  /* assertion expected after (?( */
83    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_BADPAT,  /* (?R or (?digits must be followed by ) */
84    REG_BADPAT,  /* "malformed number after (?(" */    REG_ECTYPE,  /* unknown POSIX class name */
85    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_BADPAT,  /* POSIX collating elements are not supported */
86    REG_BADPAT   /* "assertion expected after (?(" */    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 in subpattern name (missing terminator) */
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      REG_BADPAT,  /* internal error: overran compiling workspace */
107      REG_BADPAT,  /* internal error: previously-checked referenced subpattern not found */
108      REG_BADPAT,  /* DEFINE group contains more than one branch */
109      REG_BADPAT,  /* repeating a DEFINE group is not allowed */
110      REG_INVARG,  /* inconsistent NEWLINE options */
111      REG_BADPAT   /* \g is not followed followed by an (optionally braced) non-zero number */
112  };  };
113    
114  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
115    
116  static const char *pstring[] = {  static const char *const pstring[] = {
117    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
118    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
119    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 102  static const char *pstring[] = { Line 138  static const char *pstring[] = {
138    
139    
140  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
141  *          Translate error code to string        *  *          Translate error code to string        *
142  *************************************************/  *************************************************/
143    
144  size_t  PCREPOSIX_EXP_DEFN size_t
145  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)
146  {  {
147  const char *message, *addmessage;  const char *message, *addmessage;
# Line 158  return length + addlength; Line 176  return length + addlength;
176  *           Free store held by a regex           *  *           Free store held by a regex           *
177  *************************************************/  *************************************************/
178    
179  void  PCREPOSIX_EXP_DEFN void
180  regfree(regex_t *preg)  regfree(regex_t *preg)
181  {  {
182  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 181  Returns: 0 on success Line 199  Returns: 0 on success
199                various non-zero codes on failure                various non-zero codes on failure
200  */  */
201    
202  int  PCREPOSIX_EXP_DEFN int
203  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
204  {  {
205  const char *errorptr;  const char *errorptr;
206  int erroffset;  int erroffset;
207    int errorcode;
208  int options = 0;  int options = 0;
209    
210  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)   options |= PCRE_CASELESS;
211  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
212    if ((cflags & REG_DOTALL) != 0)  options |= PCRE_DOTALL;
213    if ((cflags & REG_NOSUB) != 0)   options |= PCRE_NO_AUTO_CAPTURE;
214    if ((cflags & REG_UTF8) != 0)    options |= PCRE_UTF8;
215    
216  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
217      &erroffset, NULL);
218  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
219    
220  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  if (preg->re_pcre == NULL) return eint[errorcode];
221    
222  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
223  return 0;  return 0;
224  }  }
225    
# Line 207  return 0; Line 230  return 0;
230  *              Match a regular expression        *  *              Match a regular expression        *
231  *************************************************/  *************************************************/
232    
233  int  /* Unfortunately, PCRE requires 3 ints of working space for each captured
234  regexec(regex_t *preg, const char *string, size_t nmatch,  substring, so we have to get and release working store instead of just using
235    the POSIX structures as was done in earlier releases when PCRE needed only 2
236    ints. However, if the number of possible capturing brackets is small, use a
237    block of store on the stack, to reduce the use of malloc/free. The threshold is
238    in a macro that can be changed at configure time.
239    
240    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
241    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
242    the only result is yes/no/error. */
243    
244    PCREPOSIX_EXP_DEFN int
245    regexec(const regex_t *preg, const char *string, size_t nmatch,
246    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
247  {  {
248  int rc;  int rc;
249  int options = 0;  int options = 0;
250    int *ovector = NULL;
251    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
252    BOOL allocated_ovector = FALSE;
253    BOOL nosub =
254      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
255    
256  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
257  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
258    
259  preg->re_erroffset = (size_t)(-1);   /* Only has meaning after compile */  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
260    
261  rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), options,  /* When no string data is being returned, ensure that nmatch is zero.
262    (int *)pmatch, nmatch * 2);  Otherwise, ensure the vector for holding the return data is large enough. */
263    
264  if (rc == 0) return 0;    /* All pmatch were filled in */  if (nosub) nmatch = 0;
265    
266  if (rc > 0)  else if (nmatch > 0)
267      {
268      if (nmatch <= POSIX_MALLOC_THRESHOLD)
269        {
270        ovector = &(small_ovector[0]);
271        }
272      else
273        {
274        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
275        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
276        if (ovector == NULL) return REG_ESPACE;
277        allocated_ovector = TRUE;
278        }
279      }
280    
281    rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
282      0, options, ovector, nmatch * 3);
283    
284    if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
285    
286    if (rc >= 0)
287    {    {
288    size_t i;    size_t i;
289    for (i = rc; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;    if (!nosub)
290        {
291        for (i = 0; i < (size_t)rc; i++)
292          {
293          pmatch[i].rm_so = ovector[i*2];
294          pmatch[i].rm_eo = ovector[i*2+1];
295          }
296        if (allocated_ovector) free(ovector);
297        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
298        }
299    return 0;    return 0;
300    }    }
301    
302  else switch(rc)  else
303    {    {
304    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    if (allocated_ovector) free(ovector);
305    case PCRE_ERROR_NULL: return REG_INVARG;    switch(rc)
306    case PCRE_ERROR_BADOPTION: return REG_INVARG;      {
307    case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
308    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_NULL: return REG_INVARG;
309    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      case PCRE_ERROR_BADOPTION: return REG_INVARG;
310    default: return REG_ASSERT;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
311        case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
312        case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
313        case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
314        case PCRE_ERROR_BADUTF8: return REG_INVARG;
315        case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
316        default: return REG_ASSERT;
317        }
318    }    }
319  }  }
320    
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