/[pcre]/code/trunk/pcreposix.c
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revision 23 by nigel, Sat Feb 24 21:38:41 2007 UTC revision 510 by ph10, Sat Mar 27 17:45:29 2010 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) 1997-2009 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 const 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, ERR24, ERR25 };  #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_BADPAT,  /* "unrecognized character after (?<" */    REG_EPAREN,  /* missing ) */
85    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    /* 15 */
86    REG_BADPAT,  /* "malformed number after (?(" */    REG_ESUBREG, /* reference to non-existent subpattern */
87    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_INVARG,  /* erroffset passed as NULL */
88    REG_BADPAT   /* "assertion expected after (?(" */    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,  /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
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      /* 65 */
146      REG_BADPAT,  /* different names for subpatterns of the same number are not allowed */
147      REG_BADPAT,  /* (*MARK) must have an argument */
148  };  };
149    
150  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
151    
152  static const char *pstring[] = {  static const char *const pstring[] = {
153    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
154    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
155    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 102  static const char *pstring[] = { Line 174  static const char *pstring[] = {
174    
175    
176  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
177  *          Translate error code to string        *  *          Translate error code to string        *
178  *************************************************/  *************************************************/
179    
180  size_t  PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
181  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)
182  {  {
183  const char *message, *addmessage;  const char *message, *addmessage;
# Line 158  return length + addlength; Line 212  return length + addlength;
212  *           Free store held by a regex           *  *           Free store held by a regex           *
213  *************************************************/  *************************************************/
214    
215  void  PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
216  regfree(regex_t *preg)  regfree(regex_t *preg)
217  {  {
218  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 181  Returns: 0 on success Line 235  Returns: 0 on success
235                various non-zero codes on failure                various non-zero codes on failure
236  */  */
237    
238  int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
239  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
240  {  {
241  const char *errorptr;  const char *errorptr;
242  int erroffset;  int erroffset;
243    int errorcode;
244  int options = 0;  int options = 0;
245    
246  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
247  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
248    if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
249    if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
250    if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
251    if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
252    
253  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
254      &erroffset, NULL);
255  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
256    
257  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  /* Safety: if the error code is too big for the translation vector (which
258    should not happen, but we all make mistakes), return REG_BADPAT. */
259    
260    if (preg->re_pcre == NULL)
261      {
262      return (errorcode < sizeof(eint)/sizeof(const int))?
263        eint[errorcode] : REG_BADPAT;
264      }
265    
266  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
267  return 0;  return 0;
268  }  }
269    
# Line 207  return 0; Line 274  return 0;
274  *              Match a regular expression        *  *              Match a regular expression        *
275  *************************************************/  *************************************************/
276    
277  int  /* Unfortunately, PCRE requires 3 ints of working space for each captured
278  regexec(regex_t *preg, const char *string, size_t nmatch,  substring, so we have to get and release working store instead of just using
279    the POSIX structures as was done in earlier releases when PCRE needed only 2
280    ints. However, if the number of possible capturing brackets is small, use a
281    block of store on the stack, to reduce the use of malloc/free. The threshold is
282    in a macro that can be changed at configure time.
283    
284    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
285    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
286    the only result is yes/no/error. */
287    
288    PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
289    regexec(const regex_t *preg, const char *string, size_t nmatch,
290    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
291  {  {
292  int rc;  int rc, so, eo;
293  int options = 0;  int options = 0;
294    int *ovector = NULL;
295    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
296    BOOL allocated_ovector = FALSE;
297    BOOL nosub =
298      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
299    
300  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
301  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
302    if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
303    
304    ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
305    
306    /* When no string data is being returned, or no vector has been passed in which
307    to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
308    the return data is large enough. */
309    
310    if (nosub || pmatch == NULL) nmatch = 0;
311    
312    else if (nmatch > 0)
313      {
314      if (nmatch <= POSIX_MALLOC_THRESHOLD)
315        {
316        ovector = &(small_ovector[0]);
317        }
318      else
319        {
320        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
321        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
322        if (ovector == NULL) return REG_ESPACE;
323        allocated_ovector = TRUE;
324        }
325      }
326    
327    /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
328    The man page from OS X says "REG_STARTEND affects only the location of the
329    string, not how it is matched". That is why the "so" value is used to bump the
330    start location rather than being passed as a PCRE "starting offset". */
331    
332  preg->re_erroffset = (size_t)(-1);   /* Only has meaning after compile */  if ((eflags & REG_STARTEND) != 0)
333      {
334      so = pmatch[0].rm_so;
335      eo = pmatch[0].rm_eo;
336      }
337    else
338      {
339      so = 0;
340      eo = strlen(string);
341      }
342    
343  rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), options,  rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
344    (int *)pmatch, nmatch * 2);    0, options, ovector, nmatch * 3);
345    
346  if (rc == 0) return 0;    /* All pmatch were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
347    
348  if (rc > 0)  /* Successful match */
349    
350    if (rc >= 0)
351    {    {
352    size_t i;    size_t i;
353    for (i = rc; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;    if (!nosub)
354        {
355        for (i = 0; i < (size_t)rc; i++)
356          {
357          pmatch[i].rm_so = ovector[i*2];
358          pmatch[i].rm_eo = ovector[i*2+1];
359          }
360        if (allocated_ovector) free(ovector);
361        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
362        }
363    return 0;    return 0;
364    }    }
365    
366  else switch(rc)  /* Unsuccessful match */
367    
368    if (allocated_ovector) free(ovector);
369    switch(rc)
370    {    {
371    /* ========================================================================== */
372      /* These cases are never obeyed. This is a fudge that causes a compile-time
373      error if the vector eint, which is indexed by compile-time error number, is
374      not the correct length. It seems to be the only way to do such a check at
375      compile time, as the sizeof() operator does not work in the C preprocessor.
376      As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
377    
378      case 0:
379      case (sizeof(eint)/sizeof(int) == ERRCOUNT):
380      return REG_ASSERT;
381    /* ========================================================================== */
382    
383    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
384    case PCRE_ERROR_NULL: return REG_INVARG;    case PCRE_ERROR_NULL: return REG_INVARG;
385    case PCRE_ERROR_BADOPTION: return REG_INVARG;    case PCRE_ERROR_BADOPTION: return REG_INVARG;
386    case PCRE_ERROR_BADMAGIC: return REG_INVARG;    case PCRE_ERROR_BADMAGIC: return REG_INVARG;
387    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
388    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
389      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
390      case PCRE_ERROR_BADUTF8: return REG_INVARG;
391      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
392    default: return REG_ASSERT;    default: return REG_ASSERT;
393    }    }
394  }  }

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