/[pcre]/code/trunk/pcreposix.c
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revision 25 by nigel, Sat Feb 24 21:38:45 2007 UTC revision 286 by ph10, Mon Dec 17 14:46:11 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.  
   
 Written by: Philip Hazel <ph10@cam.ac.uk>  
7    
8             Copyright (c) 1998 University of Cambridge                         Written by Philip Hazel
9               Copyright (c) 1997-2007 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    
 #include "internal.h"  
 #include "pcreposix.h"  
 #include "stdlib.h"  
40    
41    /* This module is a wrapper that provides a POSIX API to the underlying PCRE
42    functions. */
43    
44    
45    #ifdef HAVE_CONFIG_H
46    #include "config.h"
47    #endif
48    
49    
50    /* Ensure that the PCREPOSIX_EXP_xxx macros are set appropriately for
51    compiling these functions. This must come before including pcreposix.h, where
52    they are set for an application (using these functions) if they have not
53    previously been set. */
54    
55    #if defined(_WIN32) && !defined(PCRE_STATIC)
56    #  define PCREPOSIX_EXP_DECL extern __declspec(dllexport)
57    #  define PCREPOSIX_EXP_DEFN __declspec(dllexport)
58    #endif
59    
60    #include "pcre.h"
61    #include "pcre_internal.h"
62    #include "pcreposix.h"
63    
64    
65  /* Corresponding tables of PCRE error messages and POSIX error codes. */  /* Table to translate PCRE compile time error codes into POSIX error codes. */
66    
67  static const char *estring[] = {  static const int eint[] = {
68    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,    0,           /* no error */
69    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,    REG_EESCAPE, /* \ at end of pattern */
70    ERR21, ERR22, ERR23, ERR24, ERR25 };    REG_EESCAPE, /* \c at end of pattern */
71      REG_EESCAPE, /* unrecognized character follows \ */
72  static int eint[] = {    REG_BADBR,   /* numbers out of order in {} quantifier */
73    REG_EESCAPE, /* "\\ at end of pattern" */    REG_BADBR,   /* number too big in {} quantifier */
74    REG_EESCAPE, /* "\\c at end of pattern" */    REG_EBRACK,  /* missing terminating ] for character class */
75    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_ECTYPE,  /* invalid escape sequence in character class */
76    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_ERANGE,  /* range out of order in character class */
77    REG_BADBR,   /* "number too big in {} quantifier" */    REG_BADRPT,  /* nothing to repeat */
78    REG_EBRACK,  /* "missing terminating ] for character class" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
79    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_ASSERT,  /* internal error: unexpected repeat */
80    REG_ERANGE,  /* "range out of order in character class" */    REG_BADPAT,  /* unrecognized character after (? */
81    REG_BADRPT,  /* "nothing to repeat" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
82    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_EPAREN,  /* missing ) */
83    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_ESUBREG, /* reference to non-existent subpattern */
84    REG_BADPAT,  /* "unrecognized character after (?" */    REG_INVARG,  /* erroffset passed as NULL */
85    REG_ESIZE,   /* "too many capturing parenthesized sub-patterns" */    REG_INVARG,  /* unknown option bit(s) set */
86    REG_EPAREN,  /* "missing )" */    REG_EPAREN,  /* missing ) after comment */
87    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_ESIZE,   /* parentheses nested too deeply */
88    REG_INVARG,  /* "erroffset passed as NULL" */    REG_ESIZE,   /* regular expression too large */
89    REG_INVARG,  /* "unknown option bit(s) set" */    REG_ESPACE,  /* failed to get memory */
90    REG_EPAREN,  /* "missing ) after comment" */    REG_EPAREN,  /* unmatched brackets */
91    REG_ESIZE,   /* "too many sets of parentheses" */    REG_ASSERT,  /* internal error: code overflow */
92    REG_ESIZE,   /* "regular expression too large" */    REG_BADPAT,  /* unrecognized character after (?< */
93    REG_ESPACE,  /* "failed to get memory" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
94    REG_EPAREN,  /* "unmatched brackets" */    REG_BADPAT,  /* malformed number or name after (?( */
95    REG_ASSERT,  /* "internal error: code overflow" */    REG_BADPAT,  /* conditional group contains more than two branches */
96    REG_BADPAT,  /* "unrecognized character after (?<" */    REG_BADPAT,  /* assertion expected after (?( */
97    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
98    REG_BADPAT,  /* "malformed number after (?(" */    REG_ECTYPE,  /* unknown POSIX class name */
99    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_BADPAT,  /* POSIX collating elements are not supported */
100    REG_BADPAT   /* "assertion expected after (?(" */    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
101      REG_BADPAT,  /* spare error */
102      REG_BADPAT,  /* character value in \x{...} sequence is too large */
103      REG_BADPAT,  /* invalid condition (?(0) */
104      REG_BADPAT,  /* \C not allowed in lookbehind assertion */
105      REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
106      REG_BADPAT,  /* number after (?C is > 255 */
107      REG_BADPAT,  /* closing ) for (?C expected */
108      REG_BADPAT,  /* recursive call could loop indefinitely */
109      REG_BADPAT,  /* unrecognized character after (?P */
110      REG_BADPAT,  /* syntax error in subpattern name (missing terminator) */
111      REG_BADPAT,  /* two named subpatterns have the same name */
112      REG_BADPAT,  /* invalid UTF-8 string */
113      REG_BADPAT,  /* support for \P, \p, and \X has not been compiled */
114      REG_BADPAT,  /* malformed \P or \p sequence */
115      REG_BADPAT,  /* unknown property name after \P or \p */
116      REG_BADPAT,  /* subpattern name is too long (maximum 32 characters) */
117      REG_BADPAT,  /* too many named subpatterns (maximum 10,000) */
118      REG_BADPAT,  /* repeated subpattern is too long */
119      REG_BADPAT,  /* octal value is greater than \377 (not in UTF-8 mode) */
120      REG_BADPAT,  /* internal error: overran compiling workspace */
121      REG_BADPAT,  /* internal error: previously-checked referenced subpattern not found */
122      REG_BADPAT,  /* DEFINE group contains more than one branch */
123      REG_BADPAT,  /* repeating a DEFINE group is not allowed */
124      REG_INVARG,  /* inconsistent NEWLINE options */
125      REG_BADPAT,  /* \g is not followed followed by an (optionally braced) non-zero number */
126      REG_BADPAT,  /* (?+ or (?- must be followed by a non-zero number */
127      REG_BADPAT,  /* number is too big */
128      REG_BADPAT,  /* subpattern name expected */
129      REG_BADPAT   /* digit expected after (?+ */
130  };  };
131    
132  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
133    
134  static const char *pstring[] = {  static const char *const pstring[] = {
135    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
136    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
137    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 102  static const char *pstring[] = { Line 156  static const char *pstring[] = {
156    
157    
158  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
159  *          Translate error code to string        *  *          Translate error code to string        *
160  *************************************************/  *************************************************/
161    
162  size_t  PCREPOSIX_EXP_DEFN size_t
163  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)
164  {  {
165  const char *message, *addmessage;  const char *message, *addmessage;
# Line 158  return length + addlength; Line 194  return length + addlength;
194  *           Free store held by a regex           *  *           Free store held by a regex           *
195  *************************************************/  *************************************************/
196    
197  void  PCREPOSIX_EXP_DEFN void
198  regfree(regex_t *preg)  regfree(regex_t *preg)
199  {  {
200  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 181  Returns: 0 on success Line 217  Returns: 0 on success
217                various non-zero codes on failure                various non-zero codes on failure
218  */  */
219    
220  int  PCREPOSIX_EXP_DEFN int
221  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
222  {  {
223  const char *errorptr;  const char *errorptr;
224  int erroffset;  int erroffset;
225    int errorcode;
226  int options = 0;  int options = 0;
227    
228  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)   options |= PCRE_CASELESS;
229  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
230    if ((cflags & REG_DOTALL) != 0)  options |= PCRE_DOTALL;
231    if ((cflags & REG_NOSUB) != 0)   options |= PCRE_NO_AUTO_CAPTURE;
232    if ((cflags & REG_UTF8) != 0)    options |= PCRE_UTF8;
233    
234  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
235      &erroffset, NULL);
236  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
237    
238  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  if (preg->re_pcre == NULL) return eint[errorcode];
239    
240  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
241  return 0;  return 0;
242  }  }
243    
# Line 207  return 0; Line 248  return 0;
248  *              Match a regular expression        *  *              Match a regular expression        *
249  *************************************************/  *************************************************/
250    
251  int  /* Unfortunately, PCRE requires 3 ints of working space for each captured
252  regexec(regex_t *preg, const char *string, size_t nmatch,  substring, so we have to get and release working store instead of just using
253    the POSIX structures as was done in earlier releases when PCRE needed only 2
254    ints. However, if the number of possible capturing brackets is small, use a
255    block of store on the stack, to reduce the use of malloc/free. The threshold is
256    in a macro that can be changed at configure time.
257    
258    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
259    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
260    the only result is yes/no/error. */
261    
262    PCREPOSIX_EXP_DEFN int
263    regexec(const regex_t *preg, const char *string, size_t nmatch,
264    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
265  {  {
266  int rc;  int rc;
267  int options = 0;  int options = 0;
268    int *ovector = NULL;
269    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
270    BOOL allocated_ovector = FALSE;
271    BOOL nosub =
272      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
273    
274  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
275  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
276    
277  preg->re_erroffset = (size_t)(-1);   /* Only has meaning after compile */  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
278    
279  rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), options,  /* When no string data is being returned, ensure that nmatch is zero.
280    (int *)pmatch, nmatch * 2);  Otherwise, ensure the vector for holding the return data is large enough. */
281    
282  if (rc == 0) return 0;    /* All pmatch were filled in */  if (nosub) nmatch = 0;
283    
284  if (rc > 0)  else if (nmatch > 0)
285      {
286      if (nmatch <= POSIX_MALLOC_THRESHOLD)
287        {
288        ovector = &(small_ovector[0]);
289        }
290      else
291        {
292        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
293        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
294        if (ovector == NULL) return REG_ESPACE;
295        allocated_ovector = TRUE;
296        }
297      }
298    
299    rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
300      0, options, ovector, nmatch * 3);
301    
302    if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
303    
304    if (rc >= 0)
305    {    {
306    size_t i;    size_t i;
307    for (i = rc; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;    if (!nosub)
308        {
309        for (i = 0; i < (size_t)rc; i++)
310          {
311          pmatch[i].rm_so = ovector[i*2];
312          pmatch[i].rm_eo = ovector[i*2+1];
313          }
314        if (allocated_ovector) free(ovector);
315        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
316        }
317    return 0;    return 0;
318    }    }
319    
320  else switch(rc)  else
321    {    {
322    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    if (allocated_ovector) free(ovector);
323    case PCRE_ERROR_NULL: return REG_INVARG;    switch(rc)
324    case PCRE_ERROR_BADOPTION: return REG_INVARG;      {
325    case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
326    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_NULL: return REG_INVARG;
327    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      case PCRE_ERROR_BADOPTION: return REG_INVARG;
328    default: return REG_ASSERT;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
329        case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
330        case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
331        case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
332        case PCRE_ERROR_BADUTF8: return REG_INVARG;
333        case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
334        default: return REG_ASSERT;
335        }
336    }    }
337  }  }
338    

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