/[pcre]/code/trunk/pcreposix.c
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revision 53 by nigel, Sat Feb 24 21:39:42 2007 UTC revision 166 by ph10, Wed May 9 14:48:28 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) 1997-2001 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 };    REG_EESCAPE, /* unrecognized character follows \ */
58      REG_BADBR,   /* numbers out of order in {} quantifier */
59  static int eint[] = {    REG_BADBR,   /* number too big in {} quantifier */
60    REG_EESCAPE, /* "\\ at end of pattern" */    REG_EBRACK,  /* missing terminating ] for character class */
61    REG_EESCAPE, /* "\\c at end of pattern" */    REG_ECTYPE,  /* invalid escape sequence in character class */
62    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_ERANGE,  /* range out of order in character class */
63    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_BADRPT,  /* nothing to repeat */
64    REG_BADBR,   /* "number too big in {} quantifier" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
65    REG_EBRACK,  /* "missing terminating ] for character class" */    REG_ASSERT,  /* internal error: unexpected repeat */
66    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_BADPAT,  /* unrecognized character after (? */
67    REG_ERANGE,  /* "range out of order in character class" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
68    REG_BADRPT,  /* "nothing to repeat" */    REG_EPAREN,  /* missing ) */
69    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_ESUBREG, /* reference to non-existent subpattern */
70    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_INVARG,  /* erroffset passed as NULL */
71    REG_BADPAT,  /* "unrecognized character after (?" */    REG_INVARG,  /* unknown option bit(s) set */
72    REG_ASSERT,  /* "unused error" */    REG_EPAREN,  /* missing ) after comment */
73    REG_EPAREN,  /* "missing )" */    REG_ESIZE,   /* parentheses nested too deeply */
74    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_ESIZE,   /* regular expression too large */
75    REG_INVARG,  /* "erroffset passed as NULL" */    REG_ESPACE,  /* failed to get memory */
76    REG_INVARG,  /* "unknown option bit(s) set" */    REG_EPAREN,  /* unmatched brackets */
77    REG_EPAREN,  /* "missing ) after comment" */    REG_ASSERT,  /* internal error: code overflow */
78    REG_ESIZE,   /* "parentheses nested too deeply" */    REG_BADPAT,  /* unrecognized character after (?< */
79    REG_ESIZE,   /* "regular expression too large" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
80    REG_ESPACE,  /* "failed to get memory" */    REG_BADPAT,  /* malformed number or name after (?( */
81    REG_EPAREN,  /* "unmatched brackets" */    REG_BADPAT,  /* conditional group contains more than two branches */
82    REG_ASSERT,  /* "internal error: code overflow" */    REG_BADPAT,  /* assertion expected after (?( */
83    REG_BADPAT,  /* "unrecognized character after (?<" */    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
84    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_ECTYPE,  /* unknown POSIX class name */
85    REG_BADPAT,  /* "malformed number after (?(" */    REG_BADPAT,  /* POSIX collating elements are not supported */
86    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
87    REG_BADPAT,  /* "assertion expected after (?(" */    REG_BADPAT,  /* spare error */
88    REG_BADPAT,  /* "(?p must be followed by )" */    REG_BADPAT,  /* character value in \x{...} sequence is too large */
89    REG_ECTYPE,  /* "unknown POSIX class name" */    REG_BADPAT,  /* invalid condition (?(0) */
90    REG_BADPAT,  /* "POSIX collating elements are not supported" */    REG_BADPAT,  /* \C not allowed in lookbehind assertion */
91    REG_INVARG,  /* "this version of PCRE is not compiled with PCRE_UTF8 support" */    REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
92    REG_BADPAT,  /* "characters with values > 255 are not yet supported in classes" */    REG_BADPAT,  /* number after (?C is > 255 */
93    REG_BADPAT,  /* "character value in \x{...} sequence is too large" */    REG_BADPAT,  /* closing ) for (?C expected */
94    REG_BADPAT   /* "invalid condition (?(0)" */    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      REG_BADPAT   /* (?+ or (?- must be followed by a non-zero number */
113  };  };
114    
115  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
116    
117  static const char *pstring[] = {  static const char *const pstring[] = {
118    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
119    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
120    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 114  static const char *pstring[] = { Line 139  static const char *pstring[] = {
139    
140    
141  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
142  *          Translate error code to string        *  *          Translate error code to string        *
143  *************************************************/  *************************************************/
144    
145  size_t  PCREPOSIX_EXP_DEFN size_t
146  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)
147  {  {
148  const char *message, *addmessage;  const char *message, *addmessage;
# Line 170  return length + addlength; Line 177  return length + addlength;
177  *           Free store held by a regex           *  *           Free store held by a regex           *
178  *************************************************/  *************************************************/
179    
180  void  PCREPOSIX_EXP_DEFN void
181  regfree(regex_t *preg)  regfree(regex_t *preg)
182  {  {
183  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 193  Returns: 0 on success Line 200  Returns: 0 on success
200                various non-zero codes on failure                various non-zero codes on failure
201  */  */
202    
203  int  PCREPOSIX_EXP_DEFN int
204  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
205  {  {
206  const char *errorptr;  const char *errorptr;
207  int erroffset;  int erroffset;
208    int errorcode;
209  int options = 0;  int options = 0;
210    
211  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)   options |= PCRE_CASELESS;
212  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
213    if ((cflags & REG_DOTALL) != 0)  options |= PCRE_DOTALL;
214    if ((cflags & REG_NOSUB) != 0)   options |= PCRE_NO_AUTO_CAPTURE;
215    if ((cflags & REG_UTF8) != 0)    options |= PCRE_UTF8;
216    
217  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
218      &erroffset, NULL);
219  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
220    
221  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  if (preg->re_pcre == NULL) return eint[errorcode];
222    
223  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
224  return 0;  return 0;
225  }  }
226    
# Line 222  return 0; Line 234  return 0;
234  /* Unfortunately, PCRE requires 3 ints of working space for each captured  /* Unfortunately, PCRE requires 3 ints of working space for each captured
235  substring, so we have to get and release working store instead of just using  substring, so we have to get and release working store instead of just using
236  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
237  ints. */  ints. However, if the number of possible capturing brackets is small, use a
238    block of store on the stack, to reduce the use of malloc/free. The threshold is
239    in a macro that can be changed at configure time.
240    
241    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
242    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
243    the only result is yes/no/error. */
244    
245  int  PCREPOSIX_EXP_DEFN int
246  regexec(regex_t *preg, const char *string, size_t nmatch,  regexec(const regex_t *preg, const char *string, size_t nmatch,
247    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
248  {  {
249  int rc;  int rc;
250  int options = 0;  int options = 0;
251  int *ovector = NULL;  int *ovector = NULL;
252    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
253    BOOL allocated_ovector = FALSE;
254    BOOL nosub =
255      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
256    
257  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
258  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
259    
260  preg->re_erroffset = (size_t)(-1);   /* Only has meaning after compile */  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
261    
262    /* When no string data is being returned, ensure that nmatch is zero.
263    Otherwise, ensure the vector for holding the return data is large enough. */
264    
265    if (nosub) nmatch = 0;
266    
267  if (nmatch > 0)  else if (nmatch > 0)
268    {    {
269    ovector = (int *)malloc(sizeof(int) * nmatch * 3);    if (nmatch <= POSIX_MALLOC_THRESHOLD)
270    if (ovector == NULL) return REG_ESPACE;      {
271        ovector = &(small_ovector[0]);
272        }
273      else
274        {
275        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
276        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
277        if (ovector == NULL) return REG_ESPACE;
278        allocated_ovector = TRUE;
279        }
280    }    }
281    
282  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),
283    ovector, nmatch * 3);    0, options, ovector, nmatch * 3);
284    
285  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
286    
287  if (rc >= 0)  if (rc >= 0)
288    {    {
289    size_t i;    size_t i;
290    for (i = 0; i < rc; i++)    if (!nosub)
291      {      {
292      pmatch[i].rm_so = ovector[i*2];      for (i = 0; i < (size_t)rc; i++)
293      pmatch[i].rm_eo = ovector[i*2+1];        {
294          pmatch[i].rm_so = ovector[i*2];
295          pmatch[i].rm_eo = ovector[i*2+1];
296          }
297        if (allocated_ovector) free(ovector);
298        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
299      }      }
   if (ovector != NULL) free(ovector);  
   for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;  
300    return 0;    return 0;
301    }    }
302    
303  else  else
304    {    {
305    if (ovector != NULL) free(ovector);    if (allocated_ovector) free(ovector);
306    switch(rc)    switch(rc)
307      {      {
308      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
# Line 272  else Line 311  else
311      case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
312      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
313      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
314        case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
315        case PCRE_ERROR_BADUTF8: return REG_INVARG;
316        case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
317      default: return REG_ASSERT;      default: return REG_ASSERT;
318      }      }
319    }    }

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