/[pcre]/code/trunk/pcreposix.c
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revision 7 by nigel, Sat Feb 24 21:38:09 2007 UTC revision 77 by nigel, Sat Feb 24 21:40:45 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.  
7    
8  Written by: Philip Hazel <ph10@cam.ac.uk>                         Written by Philip Hazel
9               Copyright (c) 1997-2005 University of Cambridge
            Copyright (c) 1997 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    
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 };    REG_EESCAPE, /* \c at end of pattern */
57      REG_EESCAPE, /* unrecognized character follows \ */
58  static int eint[] = {    REG_BADBR,   /* numbers out of order in {} quantifier */
59    REG_EESCAPE, /* "\\ at end of pattern" */    REG_BADBR,   /* number too big in {} quantifier */
60    REG_EESCAPE, /* "\\c at end of pattern" */    REG_EBRACK,  /* missing terminating ] for character class */
61    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_ECTYPE,  /* invalid escape sequence in character class */
62    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_ERANGE,  /* range out of order in character class */
63    REG_BADBR,   /* "number too big in {} quantifier" */    REG_BADRPT,  /* nothing to repeat */
64    REG_EBRACK,  /* "missing terminating ] for character class" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
65    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_ASSERT,  /* internal error: unexpected repeat */
66    REG_ERANGE,  /* "range out of order in character class" */    REG_BADPAT,  /* unrecognized character after (? */
67    REG_BADRPT,  /* "nothing to repeat" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
68    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_EPAREN,  /* missing ) */
69    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_ESUBREG, /* reference to non-existent subpattern */
70    REG_BADPAT,  /* "unrecognized character after (?" */    REG_INVARG,  /* erroffset passed as NULL */
71    REG_ESIZE,   /* "too many capturing parenthesized sub-patterns" */    REG_INVARG,  /* unknown option bit(s) set */
72    REG_EPAREN,  /* "missing )" */    REG_EPAREN,  /* missing ) after comment */
73    REG_ESUBREG, /* "back reference to non-existent subpattern" */    REG_ESIZE,   /* parentheses nested too deeply */
74    REG_INVARG,  /* "erroffset passed as NULL" */    REG_ESIZE,   /* regular expression too large */
75    REG_INVARG,  /* "unknown option bit(s) set" */    REG_ESPACE,  /* failed to get memory */
76    REG_EPAREN,  /* "missing ) after comment" */    REG_EPAREN,  /* unmatched brackets */
77    REG_ESIZE,   /* "too many sets of parentheses" */    REG_ASSERT,  /* internal error: code overflow */
78    REG_ESIZE,   /* "regular expression too large" */    REG_BADPAT,  /* unrecognized character after (?< */
79    REG_ESPACE,  /* "failed to get memory" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
80    REG_EPAREN,  /* "unmatched brackets" */    REG_BADPAT,  /* malformed number after (?( */
81    REG_ASSERT   /* "internal error: code overflow" */    REG_BADPAT,  /* conditional group containe more than two branches */
82      REG_BADPAT,  /* assertion expected after (?( */
83      REG_BADPAT,  /* (?R or (?digits must be followed by ) */
84      REG_ECTYPE,  /* unknown POSIX class name */
85      REG_BADPAT,  /* POSIX collating elements are not supported */
86      REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
87      REG_BADPAT,  /* spare error */
88      REG_BADPAT,  /* character value in \x{...} sequence is too large */
89      REG_BADPAT,  /* invalid condition (?(0) */
90      REG_BADPAT,  /* \C not allowed in lookbehind assertion */
91      REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
92      REG_BADPAT,  /* number after (?C is > 255 */
93      REG_BADPAT,  /* closing ) for (?C expected */
94      REG_BADPAT,  /* recursive call could loop indefinitely */
95      REG_BADPAT,  /* unrecognized character after (?P */
96      REG_BADPAT,  /* syntax error after (?P */
97      REG_BADPAT,  /* two named groups 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  };  };
103    
104  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
105    
106  static const char *pstring[] = {  static const char *const pstring[] = {
107    "",                                /* Dummy for value 0 */    "",                                /* Dummy for value 0 */
108    "internal error",                  /* REG_ASSERT */    "internal error",                  /* REG_ASSERT */
109    "invalid repeat counts in {}",     /* BADBR      */    "invalid repeat counts in {}",     /* BADBR      */
# Line 97  static const char *pstring[] = { Line 128  static const char *pstring[] = {
128    
129    
130  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
131  *          Translate error code to string        *  *          Translate error code to string        *
132  *************************************************/  *************************************************/
133    
134  size_t  EXPORT size_t
135  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)
136  {  {
137  const char *message, *addmessage;  const char *message, *addmessage;
# Line 135  addlength = (preg != NULL && (int)preg-> Line 148  addlength = (preg != NULL && (int)preg->
148  if (errbuf_size > 0)  if (errbuf_size > 0)
149    {    {
150    if (addlength > 0 && errbuf_size >= length + addlength)    if (addlength > 0 && errbuf_size >= length + addlength)
151      sprintf(errbuf, "%s%s%-6d", message, addmessage, preg->re_erroffset);      sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
152    else    else
153      {      {
154      strncpy(errbuf, message, errbuf_size - 1);      strncpy(errbuf, message, errbuf_size - 1);
# Line 153  return length + addlength; Line 166  return length + addlength;
166  *           Free store held by a regex           *  *           Free store held by a regex           *
167  *************************************************/  *************************************************/
168    
169  void  EXPORT void
170  regfree(regex_t *preg)  regfree(regex_t *preg)
171  {  {
172  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 176  Returns:      0 on success Line 189  Returns:      0 on success
189                various non-zero codes on failure                various non-zero codes on failure
190  */  */
191    
192  int  EXPORT int
193  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
194  {  {
195  const char *errorptr;  const char *errorptr;
196  int erroffset;  int erroffset;
197    int errorcode;
198  int options = 0;  int options = 0;
199    
200  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
201  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
202    if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
203    
204  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
205      &erroffset, NULL);
206  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
207    
208  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  if (preg->re_pcre == NULL) return eint[errorcode];
209    
210  preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
211  return 0;  return 0;
212  }  }
213    
# Line 202  return 0; Line 218  return 0;
218  *              Match a regular expression        *  *              Match a regular expression        *
219  *************************************************/  *************************************************/
220    
221  int  /* Unfortunately, PCRE requires 3 ints of working space for each captured
222  regexec(regex_t *preg, const char *string, size_t nmatch,  substring, so we have to get and release working store instead of just using
223    the POSIX structures as was done in earlier releases when PCRE needed only 2
224    ints. However, if the number of possible capturing brackets is small, use a
225    block of store on the stack, to reduce the use of malloc/free. The threshold is
226    in a macro that can be changed at configure time. */
227    
228    EXPORT int
229    regexec(const regex_t *preg, const char *string, size_t nmatch,
230    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
231  {  {
232  int rc;  int rc;
233  int options = 0;  int options = 0;
234    int *ovector = NULL;
235    int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
236    BOOL allocated_ovector = FALSE;
237    
238  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
239  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
240    
241  preg->re_erroffset = -1;   /* Only has meaning after compile */  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
242    
243    if (nmatch > 0)
244      {
245      if (nmatch <= POSIX_MALLOC_THRESHOLD)
246        {
247        ovector = &(small_ovector[0]);
248        }
249      else
250        {
251        ovector = (int *)malloc(sizeof(int) * nmatch * 3);
252        if (ovector == NULL) return REG_ESPACE;
253        allocated_ovector = TRUE;
254        }
255      }
256    
257  rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), options,  rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
258    (int *)pmatch, nmatch * 2);    0, options, ovector, nmatch * 3);
259    
260  if (rc == 0) return 0;    /* All pmatch were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
261    
262  if (rc > 0)  if (rc >= 0)
263    {    {
264    size_t i;    size_t i;
265    for (i = rc; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;    for (i = 0; i < (size_t)rc; i++)
266        {
267        pmatch[i].rm_so = ovector[i*2];
268        pmatch[i].rm_eo = ovector[i*2+1];
269        }
270      if (allocated_ovector) free(ovector);
271      for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
272    return 0;    return 0;
273    }    }
274    
275  else switch(rc)  else
276    {    {
277    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    if (allocated_ovector) free(ovector);
278    case PCRE_ERROR_BADREF: return REG_ESUBREG;    switch(rc)
279    case PCRE_ERROR_NULL: return REG_INVARG;      {
280    case PCRE_ERROR_BADOPTION: return REG_INVARG;      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
281    case PCRE_ERROR_BADMAGIC: return REG_INVARG;      case PCRE_ERROR_NULL: return REG_INVARG;
282    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;      case PCRE_ERROR_BADOPTION: return REG_INVARG;
283    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
284    default: return REG_ASSERT;      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
285        case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
286        case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
287        case PCRE_ERROR_BADUTF8: return REG_INVARG;
288        case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
289        default: return REG_ASSERT;
290        }
291    }    }
292  }  }
293    

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