/[pcre]/code/trunk/pcreposix.c
ViewVC logotype

Diff of /code/trunk/pcreposix.c

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 69 by nigel, Sat Feb 24 21:40:18 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.  
7    
8  This module is a wrapper that provides a POSIX API to the underlying PCRE                         Written by Philip Hazel
9  functions.             Copyright (c) 1997-2007 University of Cambridge
10    
11  Written by: Philip Hazel <ph10@cam.ac.uk>  -----------------------------------------------------------------------------
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             Copyright (c) 1997-2003 University of Cambridge      * 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  Permission is granted to anyone to use this software for any purpose on any        notice, this list of conditions and the following disclaimer in the
20  computer system, and to redistribute it freely, subject to the following        documentation and/or other materials provided with the distribution.
21  restrictions:  
22        * Neither the name of the University of Cambridge nor the names of its
23  1. This software is distributed in the hope that it will be useful,        contributors may be used to endorse or promote products derived from
24     but WITHOUT ANY WARRANTY; without even the implied warranty of        this software without specific prior written permission.
25     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
26    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27  2. The origin of this software must not be misrepresented, either by  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28     explicit claim or by omission.  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30  3. Altered versions must be plainly marked as such, and must not be  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31     misrepresented as being the original software.  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33  4. If PCRE is embedded in any software that is released under the GNU  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34     General Purpose Licence (GPL), then the terms of that licence shall  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35     supersede any condition above with which it is incompatible.  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, ERR26, ERR27, ERR29, ERR29, ERR30,    REG_EESCAPE, /* \c at end of pattern */
57    ERR31, ERR32, ERR33, ERR34, ERR35, ERR36, ERR37, ERR38, ERR39, ERR40,    REG_EESCAPE, /* unrecognized character follows \ */
58    ERR41, ERR42, ERR43 };    REG_BADBR,   /* numbers out of order in {} quantifier */
59      REG_BADBR,   /* number too big in {} quantifier */
60  static int eint[] = {    REG_EBRACK,  /* missing terminating ] for character class */
61    REG_EESCAPE, /* "\\ at end of pattern" */    REG_ECTYPE,  /* invalid escape sequence in character class */
62    REG_EESCAPE, /* "\\c at end of pattern" */    REG_ERANGE,  /* range out of order in character class */
63    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_BADRPT,  /* nothing to repeat */
64    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
65    REG_BADBR,   /* "number too big in {} quantifier" */    REG_ASSERT,  /* internal error: unexpected repeat */
66    REG_EBRACK,  /* "missing terminating ] for character class" */    REG_BADPAT,  /* unrecognized character after (? */
67    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
68    REG_ERANGE,  /* "range out of order in character class" */    REG_EPAREN,  /* missing ) */
69    REG_BADRPT,  /* "nothing to repeat" */    REG_ESUBREG, /* reference to non-existent subpattern */
70    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_INVARG,  /* erroffset passed as NULL */
71    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_INVARG,  /* unknown option bit(s) set */
72    REG_BADPAT,  /* "unrecognized character after (?" */    REG_EPAREN,  /* missing ) after comment */
73    REG_BADPAT,  /* "POSIX named classes are supported only within a class" */    REG_ESIZE,   /* parentheses nested too deeply */
74    REG_EPAREN,  /* "missing )" */    REG_ESIZE,   /* regular expression too large */
75    REG_ESUBREG, /* "reference to non-existent subpattern" */    REG_ESPACE,  /* failed to get memory */
76    REG_INVARG,  /* "erroffset passed as NULL" */    REG_EPAREN,  /* unmatched brackets */
77    REG_INVARG,  /* "unknown option bit(s) set" */    REG_ASSERT,  /* internal error: code overflow */
78    REG_EPAREN,  /* "missing ) after comment" */    REG_BADPAT,  /* unrecognized character after (?< */
79    REG_ESIZE,   /* "parentheses nested too deeply" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
80    REG_ESIZE,   /* "regular expression too large" */    REG_BADPAT,  /* malformed number or name after (?( */
81    REG_ESPACE,  /* "failed to get memory" */    REG_BADPAT,  /* conditional group contains more than two branches */
82    REG_EPAREN,  /* "unmatched brackets" */    REG_BADPAT,  /* assertion expected after (?( */
83    REG_ASSERT,  /* "internal error: code overflow" */    REG_BADPAT,  /* (?R or (?digits must be followed by ) */
84    REG_BADPAT,  /* "unrecognized character after (?<" */    REG_ECTYPE,  /* unknown POSIX class name */
85    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_BADPAT,  /* POSIX collating elements are not supported */
86    REG_BADPAT,  /* "malformed number after (?(" */    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
87    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_BADPAT,  /* spare error */
88    REG_BADPAT,  /* "assertion expected after (?(" */    REG_BADPAT,  /* character value in \x{...} sequence is too large */
89    REG_BADPAT,  /* "(?R or (?digits must be followed by )" */    REG_BADPAT,  /* invalid condition (?(0) */
90    REG_ECTYPE,  /* "unknown POSIX class name" */    REG_BADPAT,  /* \C not allowed in lookbehind assertion */
91    REG_BADPAT,  /* "POSIX collating elements are not supported" */    REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
92    REG_INVARG,  /* "this version of PCRE is not compiled with PCRE_UTF8 support" */    REG_BADPAT,  /* number after (?C is > 255 */
93    REG_BADPAT,  /* "spare error" */    REG_BADPAT,  /* closing ) for (?C expected */
94    REG_BADPAT,  /* "character value in \x{...} sequence is too large" */    REG_BADPAT,  /* recursive call could loop indefinitely */
95    REG_BADPAT,  /* "invalid condition (?(0)" */    REG_BADPAT,  /* unrecognized character after (?P */
96    REG_BADPAT,  /* "\\C not allowed in lookbehind assertion" */    REG_BADPAT,  /* syntax error in subpattern name (missing terminator) */
97    REG_EESCAPE, /* "PCRE does not support \\L, \\l, \\N, \\P, \\p, \\U, \\u, or \\X" */    REG_BADPAT,  /* two named subpatterns have the same name */
98    REG_BADPAT,  /* "number after (?C is > 255" */    REG_BADPAT,  /* invalid UTF-8 string */
99    REG_BADPAT,  /* "closing ) for (?C expected" */    REG_BADPAT,  /* support for \P, \p, and \X has not been compiled */
100    REG_BADPAT,  /* "recursive call could loop indefinitely" */    REG_BADPAT,  /* malformed \P or \p sequence */
101    REG_BADPAT,  /* "unrecognized character after (?P" */    REG_BADPAT,  /* unknown property name after \P or \p */
102    REG_BADPAT,  /* "syntax error after (?P" */    REG_BADPAT,  /* subpattern name is too long (maximum 32 characters) */
103    REG_BADPAT   /* "two named groups have the same name" */    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 123  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 179  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 202  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, NULL);  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 233  substring, so we have to get and release Line 235  substring, so we have to get and release
235  the POSIX structures as was done in earlier releases when PCRE needed only 2  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  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  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. */  in a macro that can be changed at configure time.
239    
240  int  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,  regexec(const regex_t *preg, const char *string, size_t nmatch,
246    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
247  {  {
# Line 244  int options = 0; Line 250  int options = 0;
250  int *ovector = NULL;  int *ovector = NULL;
251  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
252  BOOL allocated_ovector = FALSE;  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  ((regex_t *)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  if (nmatch > 0)  /* When no string data is being returned, ensure that nmatch is zero.
262    Otherwise, ensure the vector for holding the return data is large enough. */
263    
264    if (nosub) nmatch = 0;
265    
266    else if (nmatch > 0)
267    {    {
268    if (nmatch <= POSIX_MALLOC_THRESHOLD)    if (nmatch <= POSIX_MALLOC_THRESHOLD)
269      {      {
# Line 258  if (nmatch > 0) Line 271  if (nmatch > 0)
271      }      }
272    else    else
273      {      {
274        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
275      ovector = (int *)malloc(sizeof(int) * nmatch * 3);      ovector = (int *)malloc(sizeof(int) * nmatch * 3);
276      if (ovector == NULL) return REG_ESPACE;      if (ovector == NULL) return REG_ESPACE;
277      allocated_ovector = TRUE;      allocated_ovector = TRUE;
278      }      }
279    }    }
280    
281  rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), 0, options,  rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
282    ovector, nmatch * 3);    0, options, ovector, nmatch * 3);
283    
284  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
285    
286  if (rc >= 0)  if (rc >= 0)
287    {    {
288    size_t i;    size_t i;
289    for (i = 0; i < (size_t)rc; i++)    if (!nosub)
290      {      {
291      pmatch[i].rm_so = ovector[i*2];      for (i = 0; i < (size_t)rc; i++)
292      pmatch[i].rm_eo = ovector[i*2+1];        {
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      }      }
   if (allocated_ovector) free(ovector);  
   for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;  
299    return 0;    return 0;
300    }    }
301    
# Line 293  else Line 310  else
310      case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
311      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
312      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      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;      default: return REG_ASSERT;
317      }      }
318    }    }

Legend:
Removed from v.69  
changed lines
  Added in v.145

webmaster@exim.org
ViewVC Help
Powered by ViewVC 1.1.12