/[pcre]/code/trunk/pcreposix.c
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revision 3 by nigel, Sat Feb 24 21:38:01 2007 UTC revision 432 by ph10, Wed Sep 2 16:02:56 2009 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) 1997 University of Cambridge                         Written by Philip Hazel
9               Copyright (c) 1997-2009 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  /* Corresponding tables of PCRE error messages and POSIX error codes. */  /* 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  static char *estring[] = {  #if defined(_WIN32) && !defined(PCRE_STATIC)
56    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,  #  define PCREPOSIX_EXP_DECL extern __declspec(dllexport)
57    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,  #  define PCREPOSIX_EXP_DEFN __declspec(dllexport)
58    ERR21, ERR22, ERR23 };  #endif
59    
60  static int eint[] = {  #include "pcre.h"
61    REG_EESCAPE, /* "\\ at end of pattern" */  #include "pcre_internal.h"
62    REG_EESCAPE, /* "\\c at end of pattern" */  #include "pcreposix.h"
63    REG_EESCAPE, /* "unrecognized character follows \\" */  
64    REG_BADBR,   /* "numbers out of order in {} quantifier" */  
65    REG_BADBR,   /* "number too big in {} quantifier" */  /* Table to translate PCRE compile time error codes into POSIX error codes. */
66    REG_EBRACK,  /* "missing terminating ] for character class" */  
67    REG_ECTYPE,  /* "invalid escape sequence in character class" */  static const int eint[] = {
68    REG_ERANGE,  /* "range out of order in character class" */    0,           /* no error */
69    REG_BADRPT,  /* "nothing to repeat" */    REG_EESCAPE, /* \ at end of pattern */
70    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_EESCAPE, /* \c at end of pattern */
71    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_EESCAPE, /* unrecognized character follows \ */
72    REG_BADPAT,  /* "unrecognized character after (?" */    REG_BADBR,   /* numbers out of order in {} quantifier */
73    REG_ESIZE,   /* "too many capturing parenthesized sub-patterns" */    /* 5 */
74    REG_EPAREN,  /* "missing )" */    REG_BADBR,   /* number too big in {} quantifier */
75    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_EBRACK,  /* missing terminating ] for character class */
76    REG_INVARG,  /* "erroffset passed as NULL" */    REG_ECTYPE,  /* invalid escape sequence in character class */
77    REG_INVARG,  /* "unknown option bit(s) set" */    REG_ERANGE,  /* range out of order in character class */
78    REG_EPAREN,  /* "missing ) after comment" */    REG_BADRPT,  /* nothing to repeat */
79    REG_ESIZE,   /* "too many sets of parentheses" */    /* 10 */
80    REG_ESIZE,   /* "regular expression too large" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
81    REG_ESPACE,  /* "failed to get memory" */    REG_ASSERT,  /* internal error: unexpected repeat */
82    REG_EPAREN,  /* "unmatched brackets" */    REG_BADPAT,  /* unrecognized character after (? */
83    REG_ASSERT   /* "internal error: code overflow" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
84      REG_EPAREN,  /* missing ) */
85      /* 15 */
86      REG_ESUBREG, /* reference to non-existent subpattern */
87      REG_INVARG,  /* erroffset passed as NULL */
88      REG_INVARG,  /* unknown option bit(s) set */
89      REG_EPAREN,  /* missing ) after comment */
90      REG_ESIZE,   /* parentheses nested too deeply */
91      /* 20 */
92      REG_ESIZE,   /* regular expression too large */
93      REG_ESPACE,  /* failed to get memory */
94      REG_EPAREN,  /* unmatched parentheses */
95      REG_ASSERT,  /* internal error: code overflow */
96      REG_BADPAT,  /* unrecognized character after (?< */
97      /* 25 */
98      REG_BADPAT,  /* lookbehind assertion is not fixed length */
99      REG_BADPAT,  /* malformed number or name after (?( */
100      REG_BADPAT,  /* conditional group contains more than two branches */
101      REG_BADPAT,  /* assertion expected after (?( */
102      REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
103      /* 30 */
104      REG_ECTYPE,  /* unknown POSIX class name */
105      REG_BADPAT,  /* POSIX collating elements are not supported */
106      REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
107      REG_BADPAT,  /* spare error */
108      REG_BADPAT,  /* character value in \x{...} sequence is too large */
109      /* 35 */
110      REG_BADPAT,  /* invalid condition (?(0) */
111      REG_BADPAT,  /* \C not allowed in lookbehind assertion */
112      REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
113      REG_BADPAT,  /* number after (?C is > 255 */
114      REG_BADPAT,  /* closing ) for (?C expected */
115      /* 40 */
116      REG_BADPAT,  /* recursive call could loop indefinitely */
117      REG_BADPAT,  /* unrecognized character after (?P */
118      REG_BADPAT,  /* syntax error in subpattern name (missing terminator) */
119      REG_BADPAT,  /* two named subpatterns have the same name */
120      REG_BADPAT,  /* invalid UTF-8 string */
121      /* 45 */
122      REG_BADPAT,  /* support for \P, \p, and \X has not been compiled */
123      REG_BADPAT,  /* malformed \P or \p sequence */
124      REG_BADPAT,  /* unknown property name after \P or \p */
125      REG_BADPAT,  /* subpattern name is too long (maximum 32 characters) */
126      REG_BADPAT,  /* too many named subpatterns (maximum 10,000) */
127      /* 50 */
128      REG_BADPAT,  /* repeated subpattern is too long */
129      REG_BADPAT,  /* octal value is greater than \377 (not in UTF-8 mode) */
130      REG_BADPAT,  /* internal error: overran compiling workspace */
131      REG_BADPAT,  /* internal error: previously-checked referenced subpattern not found */
132      REG_BADPAT,  /* DEFINE group contains more than one branch */
133      /* 55 */
134      REG_BADPAT,  /* repeating a DEFINE group is not allowed */
135      REG_INVARG,  /* inconsistent NEWLINE options */
136      REG_BADPAT,  /* \g is not followed followed by an (optionally braced) non-zero number */
137      REG_BADPAT,  /* a numbered reference must not be zero */
138      REG_BADPAT,  /* (*VERB) with an argument is not supported */
139      /* 60 */
140      REG_BADPAT,  /* (*VERB) not recognized */
141      REG_BADPAT,  /* number is too big */
142      REG_BADPAT,  /* subpattern name expected */
143      REG_BADPAT,  /* digit expected after (?+ */
144      REG_BADPAT   /* ] is an invalid data character in JavaScript compatibility mode */
145  };  };
146    
147  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
148    
149  static char *pstring[] = {  static const char *const pstring[] = {
150    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
151    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
152    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 97  static char *pstring[] = { Line 171  static char *pstring[] = {
171    
172    
173  /*************************************************  /*************************************************
 *          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)  
 {  
 int i;  
 for (i = 0; i < sizeof(estring)/sizeof(char *); i++)  
   if (strcmp(s, estring[i]) == 0) return eint[i];  
 return REG_ASSERT;  
 }  
   
   
   
 /*************************************************  
174  *          Translate error code to string        *  *          Translate error code to string        *
175  *************************************************/  *************************************************/
176    
177  size_t  PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
178  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)
179  {  {
180  char *message, *addmessage;  const char *message, *addmessage;
181  int length, adlength;  size_t length, addlength;
182    
183  message = (errcode >= sizeof(pstring)/sizeof(char *))?  message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
184    "unknown error code" : pstring[errcode];    "unknown error code" : pstring[errcode];
185    length = strlen(message) + 1;
186    
187  length = (int)strlen(message) + 1;  addmessage = " at offset ";
188    addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
189  if (preg != NULL && (int)preg->re_erroffset != -1)    strlen(addmessage) + 6 : 0;
   {  
   addmessage = " at offset ";  
   adlength = (int)strlen(addmessage) + 6;  
   }  
 else adlength = 0;  
190    
191  if (errbuf_size > 0)  if (errbuf_size > 0)
192    {    {
193    if (adlength > 0 && errbuf_size >= length + adlength)    if (addlength > 0 && errbuf_size >= length + addlength)
194      sprintf(errbuf, "%s%s%-6d", message, addmessage, preg->re_erroffset);      sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
195    else    else
196      {      {
197      strncpy(errbuf, message, errbuf_size - 1);      strncpy(errbuf, message, errbuf_size - 1);
# Line 147  if (errbuf_size > 0) Line 199  if (errbuf_size > 0)
199      }      }
200    }    }
201    
202  return length + adlength;  return length + addlength;
203  }  }
204    
205    
# Line 157  return length + adlength; Line 209  return length + adlength;
209  *           Free store held by a regex           *  *           Free store held by a regex           *
210  *************************************************/  *************************************************/
211    
212  void  PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
213  regfree(regex_t *preg)  regfree(regex_t *preg)
214  {  {
215  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 180  Returns:      0 on success Line 232  Returns:      0 on success
232                various non-zero codes on failure                various non-zero codes on failure
233  */  */
234    
235  int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
236  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
237  {  {
238  char *errorptr;  const char *errorptr;
239  int erroffset;  int erroffset;
240    int errorcode;
241  int options = 0;  int options = 0;
242    
243  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
244  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
245    if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
246    if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
247    if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
248    if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
249    
250  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
251      &erroffset, NULL);
252  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
253    
254  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  /* Safety: if the error code is too big for the translation vector (which
255    should not happen, but we all make mistakes), return REG_BADPAT. */
256    
257  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  if (preg->re_pcre == NULL)
258      {
259      return (errorcode < sizeof(eint)/sizeof(const int))?
260        eint[errorcode] : REG_BADPAT;
261      }
262    
263    preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
264  return 0;  return 0;
265  }  }
266    
# Line 206  return 0; Line 271  return 0;
271  *              Match a regular expression        *  *              Match a regular expression        *
272  *************************************************/  *************************************************/
273    
274  int  /* Unfortunately, PCRE requires 3 ints of working space for each captured
275  regexec(regex_t *preg, const char *string, size_t nmatch,  substring, so we have to get and release working store instead of just using
276    the POSIX structures as was done in earlier releases when PCRE needed only 2
277    ints. However, if the number of possible capturing brackets is small, use a
278    block of store on the stack, to reduce the use of malloc/free. The threshold is
279    in a macro that can be changed at configure time.
280    
281    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
282    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
283    the only result is yes/no/error. */
284    
285    PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
286    regexec(const regex_t *preg, const char *string, size_t nmatch,
287    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
288  {  {
289  int rc;  int rc, so, eo;
290  int options = 0;  int options = 0;
291    int *ovector = NULL;
292    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
293    BOOL allocated_ovector = FALSE;
294    BOOL nosub =
295      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
296    
297  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
298  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
299    if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
300    
301  preg->re_erroffset = -1;   /* Only has meaning after compile */  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
302    
303  rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), options,  /* When no string data is being returned, or no vector has been passed in which
304    (int *)pmatch, nmatch * 2);  to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
305    the return data is large enough. */
306    
307    if (nosub || pmatch == NULL) nmatch = 0;
308    
309    else if (nmatch > 0)
310      {
311      if (nmatch <= POSIX_MALLOC_THRESHOLD)
312        {
313        ovector = &(small_ovector[0]);
314        }
315      else
316        {
317        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
318        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
319        if (ovector == NULL) return REG_ESPACE;
320        allocated_ovector = TRUE;
321        }
322      }
323    
324  if (rc == 0) return 0;    /* All pmatch were filled in */  /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
325    The man page from OS X says "REG_STARTEND affects only the location of the
326    string, not how it is matched". That is why the "so" value is used to bump the
327    start location rather than being passed as a PCRE "starting offset". */
328    
329  if (rc > 0)  if ((eflags & REG_STARTEND) != 0)
330    {    {
331    int i;    so = pmatch[0].rm_so;
332    for (i = rc; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;    eo = pmatch[0].rm_eo;
333      }
334    else
335      {
336      so = 0;
337      eo = strlen(string);
338      }
339    
340    rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
341      0, options, ovector, nmatch * 3);
342    
343    if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
344    
345    if (rc >= 0)
346      {
347      size_t i;
348      if (!nosub)
349        {
350        for (i = 0; i < (size_t)rc; i++)
351          {
352          pmatch[i].rm_so = ovector[i*2];
353          pmatch[i].rm_eo = ovector[i*2+1];
354          }
355        if (allocated_ovector) free(ovector);
356        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
357        }
358    return 0;    return 0;
359    }    }
360    
361  else switch(rc)  else
362    {    {
363    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    if (allocated_ovector) free(ovector);
364    case PCRE_ERROR_BADREF: return REG_ESUBREG;    switch(rc)
365    case PCRE_ERROR_NULL: return REG_INVARG;      {
366    case PCRE_ERROR_BADOPTION: return REG_INVARG;      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
367    case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_NULL: return REG_INVARG;
368    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_BADOPTION: return REG_INVARG;
369    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
370    default: return REG_ASSERT;      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
371        case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
372        case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
373        case PCRE_ERROR_BADUTF8: return REG_INVARG;
374        case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
375        default: return REG_ASSERT;
376        }
377    }    }
378  }  }
379    

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