/[pcre]/code/trunk/pcreposix.c
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revision 75 by nigel, Sat Feb 24 21:40:37 2007 UTC revision 518 by ph10, Tue May 18 15:47:01 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) 1997-2004 University of Cambridge                         Written by Philip Hazel
9               Copyright (c) 1997-2010 University of Cambridge
10    
11  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
12  Redistribution and use in source and binary forms, with or without  Redistribution and use in source and binary forms, with or without
# Line 43  POSSIBILITY OF SUCH DAMAGE. Line 37  POSSIBILITY OF SUCH DAMAGE.
37  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
38  */  */
39    
40  #include "internal.h"  
41  #include "pcreposix.h"  /* This module is a wrapper that provides a POSIX API to the underlying PCRE
42  #include "stdlib.h"  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    
 /* Corresponding tables of PCRE error messages and POSIX error codes. */  
64    
65  static const char *const estring[] = {  /* Table to translate PCRE compile time error codes into POSIX error codes. */
   ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,  
   ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,  
   ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,  
   ERR31, ERR32, ERR33, ERR34, ERR35, ERR36, ERR37, ERR38, ERR39, ERR40,  
   ERR41, ERR42, ERR43, ERR44, ERR45, ERR46, ERR47 };  
66    
67  static const int eint[] = {  static const int eint[] = {
68    REG_EESCAPE, /* "\\ at end of pattern" */    0,           /* no error */
69    REG_EESCAPE, /* "\\c at end of pattern" */    REG_EESCAPE, /* \ at end of pattern */
70    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_EESCAPE, /* \c at end of pattern */
71    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_EESCAPE, /* unrecognized character follows \ */
72    REG_BADBR,   /* "number too big in {} quantifier" */    REG_BADBR,   /* numbers out of order in {} quantifier */
73    REG_EBRACK,  /* "missing terminating ] for character class" */    /* 5 */
74    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_BADBR,   /* number too big in {} quantifier */
75    REG_ERANGE,  /* "range out of order in character class" */    REG_EBRACK,  /* missing terminating ] for character class */
76    REG_BADRPT,  /* "nothing to repeat" */    REG_ECTYPE,  /* invalid escape sequence in character class */
77    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_ERANGE,  /* range out of order in character class */
78    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_BADRPT,  /* nothing to repeat */
79    REG_BADPAT,  /* "unrecognized character after (?" */    /* 10 */
80    REG_BADPAT,  /* "POSIX named classes are supported only within a class" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
81    REG_EPAREN,  /* "missing )" */    REG_ASSERT,  /* internal error: unexpected repeat */
82    REG_ESUBREG, /* "reference to non-existent subpattern" */    REG_BADPAT,  /* unrecognized character after (? */
83    REG_INVARG,  /* "erroffset passed as NULL" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
84    REG_INVARG,  /* "unknown option bit(s) set" */    REG_EPAREN,  /* missing ) */
85    REG_EPAREN,  /* "missing ) after comment" */    /* 15 */
86    REG_ESIZE,   /* "parentheses nested too deeply" */    REG_ESUBREG, /* reference to non-existent subpattern */
87    REG_ESIZE,   /* "regular expression too large" */    REG_INVARG,  /* erroffset passed as NULL */
88    REG_ESPACE,  /* "failed to get memory" */    REG_INVARG,  /* unknown option bit(s) set */
89    REG_EPAREN,  /* "unmatched brackets" */    REG_EPAREN,  /* missing ) after comment */
90    REG_ASSERT,  /* "internal error: code overflow" */    REG_ESIZE,   /* parentheses nested too deeply */
91    REG_BADPAT,  /* "unrecognized character after (?<" */    /* 20 */
92    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_ESIZE,   /* regular expression too large */
93    REG_BADPAT,  /* "malformed number after (?(" */    REG_ESPACE,  /* failed to get memory */
94    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_EPAREN,  /* unmatched parentheses */
95    REG_BADPAT,  /* "assertion expected after (?(" */    REG_ASSERT,  /* internal error: code overflow */
96    REG_BADPAT,  /* "(?R or (?digits must be followed by )" */    REG_BADPAT,  /* unrecognized character after (?< */
97    REG_ECTYPE,  /* "unknown POSIX class name" */    /* 25 */
98    REG_BADPAT,  /* "POSIX collating elements are not supported" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
99    REG_INVARG,  /* "this version of PCRE is not compiled with PCRE_UTF8 support" */    REG_BADPAT,  /* malformed number or name after (?( */
100    REG_BADPAT,  /* "spare error" */    REG_BADPAT,  /* conditional group contains more than two branches */
101    REG_BADPAT,  /* "character value in \x{...} sequence is too large" */    REG_BADPAT,  /* assertion expected after (?( */
102    REG_BADPAT,  /* "invalid condition (?(0)" */    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
103    REG_BADPAT,  /* "\\C not allowed in lookbehind assertion" */    /* 30 */
104    REG_EESCAPE, /* "PCRE does not support \\L, \\l, \\N, \\U, or \\u" */    REG_ECTYPE,  /* unknown POSIX class name */
105    REG_BADPAT,  /* "number after (?C is > 255" */    REG_BADPAT,  /* POSIX collating elements are not supported */
106    REG_BADPAT,  /* "closing ) for (?C expected" */    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
107    REG_BADPAT,  /* "recursive call could loop indefinitely" */    REG_BADPAT,  /* spare error */
108    REG_BADPAT,  /* "unrecognized character after (?P" */    REG_BADPAT,  /* character value in \x{...} sequence is too large */
109    REG_BADPAT,  /* "syntax error after (?P" */    /* 35 */
110    REG_BADPAT,  /* "two named groups have the same name" */    REG_BADPAT,  /* invalid condition (?(0) */
111    REG_BADPAT,  /* "invalid UTF-8 string" */    REG_BADPAT,  /* \C not allowed in lookbehind assertion */
112    REG_BADPAT,  /* "support for \\P, \\p, and \\X has not been compiled" */    REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
113    REG_BADPAT,  /* "malformed \\P or \\p sequence" */    REG_BADPAT,  /* number after (?C is > 255 */
114    REG_BADPAT   /* "unknown property name after \\P or \\p" */    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      REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UCP support */
149  };  };
150    
151  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
# Line 135  static const char *const pstring[] = { Line 175  static const char *const pstring[] = {
175    
176    
177  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
178  *          Translate error code to string        *  *          Translate error code to string        *
179  *************************************************/  *************************************************/
180    
181  EXPORT size_t  PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
182  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)
183  {  {
184  const char *message, *addmessage;  const char *message, *addmessage;
# Line 191  return length + addlength; Line 213  return length + addlength;
213  *           Free store held by a regex           *  *           Free store held by a regex           *
214  *************************************************/  *************************************************/
215    
216  EXPORT void  PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
217  regfree(regex_t *preg)  regfree(regex_t *preg)
218  {  {
219  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 214  Returns:      0 on success Line 236  Returns:      0 on success
236                various non-zero codes on failure                various non-zero codes on failure
237  */  */
238    
239  EXPORT int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
240  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
241  {  {
242  const char *errorptr;  const char *errorptr;
243  int erroffset;  int erroffset;
244    int errorcode;
245  int options = 0;  int options = 0;
246    
247  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
248  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
249    if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
250    if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
251    if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
252    if ((cflags & REG_UCP) != 0)      options |= PCRE_UCP;
253    if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
254    
255  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
256      &erroffset, NULL);
257  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
258    
259  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  /* Safety: if the error code is too big for the translation vector (which
260    should not happen, but we all make mistakes), return REG_BADPAT. */
261    
262    if (preg->re_pcre == NULL)
263      {
264      return (errorcode < sizeof(eint)/sizeof(const int))?
265        eint[errorcode] : REG_BADPAT;
266      }
267    
268  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
269  return 0;  return 0;
# Line 245  substring, so we have to get and release Line 281  substring, so we have to get and release
281  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
282  ints. However, if the number of possible capturing brackets is small, use a  ints. However, if the number of possible capturing brackets is small, use a
283  block of store on the stack, to reduce the use of malloc/free. The threshold is  block of store on the stack, to reduce the use of malloc/free. The threshold is
284  in a macro that can be changed at configure time. */  in a macro that can be changed at configure time.
285    
286  EXPORT int  If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
287    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
288    the only result is yes/no/error. */
289    
290    PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
291  regexec(const regex_t *preg, const char *string, size_t nmatch,  regexec(const regex_t *preg, const char *string, size_t nmatch,
292    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
293  {  {
294  int rc;  int rc, so, eo;
295  int options = 0;  int options = 0;
296  int *ovector = NULL;  int *ovector = NULL;
297  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
298  BOOL allocated_ovector = FALSE;  BOOL allocated_ovector = FALSE;
299    BOOL nosub =
300      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
301    
302  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
303  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
304    if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
305    
306  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */  ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
307    
308  if (nmatch > 0)  /* When no string data is being returned, or no vector has been passed in which
309    to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
310    the return data is large enough. */
311    
312    if (nosub || pmatch == NULL) nmatch = 0;
313    
314    else if (nmatch > 0)
315    {    {
316    if (nmatch <= POSIX_MALLOC_THRESHOLD)    if (nmatch <= POSIX_MALLOC_THRESHOLD)
317      {      {
# Line 270  if (nmatch > 0) Line 319  if (nmatch > 0)
319      }      }
320    else    else
321      {      {
322        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
323      ovector = (int *)malloc(sizeof(int) * nmatch * 3);      ovector = (int *)malloc(sizeof(int) * nmatch * 3);
324      if (ovector == NULL) return REG_ESPACE;      if (ovector == NULL) return REG_ESPACE;
325      allocated_ovector = TRUE;      allocated_ovector = TRUE;
326      }      }
327    }    }
328    
329  rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),  /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
330    The man page from OS X says "REG_STARTEND affects only the location of the
331    string, not how it is matched". That is why the "so" value is used to bump the
332    start location rather than being passed as a PCRE "starting offset". */
333    
334    if ((eflags & REG_STARTEND) != 0)
335      {
336      so = pmatch[0].rm_so;
337      eo = pmatch[0].rm_eo;
338      }
339    else
340      {
341      so = 0;
342      eo = strlen(string);
343      }
344    
345    rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
346    0, options, ovector, nmatch * 3);    0, options, ovector, nmatch * 3);
347    
348  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */
349    
350    /* Successful match */
351    
352  if (rc >= 0)  if (rc >= 0)
353    {    {
354    size_t i;    size_t i;
355    for (i = 0; i < (size_t)rc; i++)    if (!nosub)
356      {      {
357      pmatch[i].rm_so = ovector[i*2];      for (i = 0; i < (size_t)rc; i++)
358      pmatch[i].rm_eo = ovector[i*2+1];        {
359          pmatch[i].rm_so = ovector[i*2];
360          pmatch[i].rm_eo = ovector[i*2+1];
361          }
362        if (allocated_ovector) free(ovector);
363        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
364      }      }
   if (allocated_ovector) free(ovector);  
   for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;  
365    return 0;    return 0;
366    }    }
367    
368  else  /* Unsuccessful match */
369    
370    if (allocated_ovector) free(ovector);
371    switch(rc)
372    {    {
373    if (allocated_ovector) free(ovector);  /* ========================================================================== */
374    switch(rc)    /* These cases are never obeyed. This is a fudge that causes a compile-time
375      {    error if the vector eint, which is indexed by compile-time error number, is
376      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    not the correct length. It seems to be the only way to do such a check at
377      case PCRE_ERROR_NULL: return REG_INVARG;    compile time, as the sizeof() operator does not work in the C preprocessor.
378      case PCRE_ERROR_BADOPTION: return REG_INVARG;    As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
379      case PCRE_ERROR_BADMAGIC: return REG_INVARG;  
380      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;    case 0:
381      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;    case (sizeof(eint)/sizeof(int) == ERRCOUNT):
382      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;    return REG_ASSERT;
383      case PCRE_ERROR_BADUTF8: return REG_INVARG;  /* ========================================================================== */
384      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;  
385      default: return REG_ASSERT;    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
386      }    case PCRE_ERROR_NULL: return REG_INVARG;
387      case PCRE_ERROR_BADOPTION: return REG_INVARG;
388      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
389      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
390      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
391      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
392      case PCRE_ERROR_BADUTF8: return REG_INVARG;
393      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
394      default: return REG_ASSERT;
395    }    }
396  }  }
397    

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