/[pcre]/code/trunk/pcreposix.c
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revision 75 by nigel, Sat Feb 24 21:40:37 2007 UTC revision 747 by ph10, Tue Nov 15 17:35:10 2011 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    
 /* Corresponding tables of PCRE error messages and POSIX error codes. */  
49    
50  static const char *const estring[] = {  /* Ensure that the PCREPOSIX_EXP_xxx macros are set appropriately for
51    ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,  ERR10,  compiling these functions. This must come before including pcreposix.h, where
52    ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,  they are set for an application (using these functions) if they have not
53    ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,  previously been set. */
54    ERR31, ERR32, ERR33, ERR34, ERR35, ERR36, ERR37, ERR38, ERR39, ERR40,  
55    ERR41, ERR42, ERR43, ERR44, ERR45, ERR46, ERR47 };  #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    /* We include pcre.h before pcre_internal.h so that the PCRE library functions
61    are declared as "import" for Windows by defining PCRE_EXP_DECL as "import".
62    This is needed even though pcre_internal.h itself includes pcre.h, because it
63    does so after it has set PCRE_EXP_DECL to "export" if it is not already set. */
64    
65    #include "pcre.h"
66    #include "pcre_internal.h"
67    #include "pcreposix.h"
68    
69    
70    /* Table to translate PCRE compile time error codes into POSIX error codes. */
71    
72  static const int eint[] = {  static const int eint[] = {
73    REG_EESCAPE, /* "\\ at end of pattern" */    0,           /* no error */
74    REG_EESCAPE, /* "\\c at end of pattern" */    REG_EESCAPE, /* \ at end of pattern */
75    REG_EESCAPE, /* "unrecognized character follows \\" */    REG_EESCAPE, /* \c at end of pattern */
76    REG_BADBR,   /* "numbers out of order in {} quantifier" */    REG_EESCAPE, /* unrecognized character follows \ */
77    REG_BADBR,   /* "number too big in {} quantifier" */    REG_BADBR,   /* numbers out of order in {} quantifier */
78    REG_EBRACK,  /* "missing terminating ] for character class" */    /* 5 */
79    REG_ECTYPE,  /* "invalid escape sequence in character class" */    REG_BADBR,   /* number too big in {} quantifier */
80    REG_ERANGE,  /* "range out of order in character class" */    REG_EBRACK,  /* missing terminating ] for character class */
81    REG_BADRPT,  /* "nothing to repeat" */    REG_ECTYPE,  /* invalid escape sequence in character class */
82    REG_BADRPT,  /* "operand of unlimited repeat could match the empty string" */    REG_ERANGE,  /* range out of order in character class */
83    REG_ASSERT,  /* "internal error: unexpected repeat" */    REG_BADRPT,  /* nothing to repeat */
84    REG_BADPAT,  /* "unrecognized character after (?" */    /* 10 */
85    REG_BADPAT,  /* "POSIX named classes are supported only within a class" */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
86    REG_EPAREN,  /* "missing )" */    REG_ASSERT,  /* internal error: unexpected repeat */
87    REG_ESUBREG, /* "reference to non-existent subpattern" */    REG_BADPAT,  /* unrecognized character after (? */
88    REG_INVARG,  /* "erroffset passed as NULL" */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
89    REG_INVARG,  /* "unknown option bit(s) set" */    REG_EPAREN,  /* missing ) */
90    REG_EPAREN,  /* "missing ) after comment" */    /* 15 */
91    REG_ESIZE,   /* "parentheses nested too deeply" */    REG_ESUBREG, /* reference to non-existent subpattern */
92    REG_ESIZE,   /* "regular expression too large" */    REG_INVARG,  /* erroffset passed as NULL */
93    REG_ESPACE,  /* "failed to get memory" */    REG_INVARG,  /* unknown option bit(s) set */
94    REG_EPAREN,  /* "unmatched brackets" */    REG_EPAREN,  /* missing ) after comment */
95    REG_ASSERT,  /* "internal error: code overflow" */    REG_ESIZE,   /* parentheses nested too deeply */
96    REG_BADPAT,  /* "unrecognized character after (?<" */    /* 20 */
97    REG_BADPAT,  /* "lookbehind assertion is not fixed length" */    REG_ESIZE,   /* regular expression too large */
98    REG_BADPAT,  /* "malformed number after (?(" */    REG_ESPACE,  /* failed to get memory */
99    REG_BADPAT,  /* "conditional group containe more than two branches" */    REG_EPAREN,  /* unmatched parentheses */
100    REG_BADPAT,  /* "assertion expected after (?(" */    REG_ASSERT,  /* internal error: code overflow */
101    REG_BADPAT,  /* "(?R or (?digits must be followed by )" */    REG_BADPAT,  /* unrecognized character after (?< */
102    REG_ECTYPE,  /* "unknown POSIX class name" */    /* 25 */
103    REG_BADPAT,  /* "POSIX collating elements are not supported" */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
104    REG_INVARG,  /* "this version of PCRE is not compiled with PCRE_UTF8 support" */    REG_BADPAT,  /* malformed number or name after (?( */
105    REG_BADPAT,  /* "spare error" */    REG_BADPAT,  /* conditional group contains more than two branches */
106    REG_BADPAT,  /* "character value in \x{...} sequence is too large" */    REG_BADPAT,  /* assertion expected after (?( */
107    REG_BADPAT,  /* "invalid condition (?(0)" */    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
108    REG_BADPAT,  /* "\\C not allowed in lookbehind assertion" */    /* 30 */
109    REG_EESCAPE, /* "PCRE does not support \\L, \\l, \\N, \\U, or \\u" */    REG_ECTYPE,  /* unknown POSIX class name */
110    REG_BADPAT,  /* "number after (?C is > 255" */    REG_BADPAT,  /* POSIX collating elements are not supported */
111    REG_BADPAT,  /* "closing ) for (?C expected" */    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
112    REG_BADPAT,  /* "recursive call could loop indefinitely" */    REG_BADPAT,  /* spare error */
113    REG_BADPAT,  /* "unrecognized character after (?P" */    REG_BADPAT,  /* character value in \x{...} sequence is too large */
114    REG_BADPAT,  /* "syntax error after (?P" */    /* 35 */
115    REG_BADPAT,  /* "two named groups have the same name" */    REG_BADPAT,  /* invalid condition (?(0) */
116    REG_BADPAT,  /* "invalid UTF-8 string" */    REG_BADPAT,  /* \C not allowed in lookbehind assertion */
117    REG_BADPAT,  /* "support for \\P, \\p, and \\X has not been compiled" */    REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
118    REG_BADPAT,  /* "malformed \\P or \\p sequence" */    REG_BADPAT,  /* number after (?C is > 255 */
119    REG_BADPAT   /* "unknown property name after \\P or \\p" */    REG_BADPAT,  /* closing ) for (?C expected */
120      /* 40 */
121      REG_BADPAT,  /* recursive call could loop indefinitely */
122      REG_BADPAT,  /* unrecognized character after (?P */
123      REG_BADPAT,  /* syntax error in subpattern name (missing terminator) */
124      REG_BADPAT,  /* two named subpatterns have the same name */
125      REG_BADPAT,  /* invalid UTF-8 string */
126      /* 45 */
127      REG_BADPAT,  /* support for \P, \p, and \X has not been compiled */
128      REG_BADPAT,  /* malformed \P or \p sequence */
129      REG_BADPAT,  /* unknown property name after \P or \p */
130      REG_BADPAT,  /* subpattern name is too long (maximum 32 characters) */
131      REG_BADPAT,  /* too many named subpatterns (maximum 10,000) */
132      /* 50 */
133      REG_BADPAT,  /* repeated subpattern is too long */
134      REG_BADPAT,  /* octal value is greater than \377 (not in UTF-8 mode) */
135      REG_BADPAT,  /* internal error: overran compiling workspace */
136      REG_BADPAT,  /* internal error: previously-checked referenced subpattern not found */
137      REG_BADPAT,  /* DEFINE group contains more than one branch */
138      /* 55 */
139      REG_BADPAT,  /* repeating a DEFINE group is not allowed */
140      REG_INVARG,  /* inconsistent NEWLINE options */
141      REG_BADPAT,  /* \g is not followed followed by an (optionally braced) non-zero number */
142      REG_BADPAT,  /* a numbered reference must not be zero */
143      REG_BADPAT,  /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
144      /* 60 */
145      REG_BADPAT,  /* (*VERB) not recognized */
146      REG_BADPAT,  /* number is too big */
147      REG_BADPAT,  /* subpattern name expected */
148      REG_BADPAT,  /* digit expected after (?+ */
149      REG_BADPAT,  /* ] is an invalid data character in JavaScript compatibility mode */
150      /* 65 */
151      REG_BADPAT,  /* different names for subpatterns of the same number are not allowed */
152      REG_BADPAT,  /* (*MARK) must have an argument */
153      REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UCP support */
154      REG_BADPAT,  /* \c must be followed by an ASCII character */
155      REG_BADPAT,  /* \k is not followed by a braced, angle-bracketed, or quoted name */
156      /* 70 */
157      REG_BADPAT,  /* internal error: unknown opcode in find_fixedlength() */
158  };  };
159    
160  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
# Line 135  static const char *const pstring[] = { Line 184  static const char *const pstring[] = {
184    
185    
186  /*************************************************  /*************************************************
 *          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;  
 }  
   
   
   
 /*************************************************  
187  *          Translate error code to string        *  *          Translate error code to string        *
188  *************************************************/  *************************************************/
189    
190  EXPORT size_t  PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
191  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)
192  {  {
193  const char *message, *addmessage;  const char *message, *addmessage;
# Line 191  return length + addlength; Line 222  return length + addlength;
222  *           Free store held by a regex           *  *           Free store held by a regex           *
223  *************************************************/  *************************************************/
224    
225  EXPORT void  PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
226  regfree(regex_t *preg)  regfree(regex_t *preg)
227  {  {
228  (pcre_free)(preg->re_pcre);  (pcre_free)(preg->re_pcre);
# Line 214  Returns:      0 on success Line 245  Returns:      0 on success
245                various non-zero codes on failure                various non-zero codes on failure
246  */  */
247    
248  EXPORT int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
249  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
250  {  {
251  const char *errorptr;  const char *errorptr;
252  int erroffset;  int erroffset;
253    int errorcode;
254  int options = 0;  int options = 0;
255    
256  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
257  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
258    if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
259    if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
260    if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
261    if ((cflags & REG_UCP) != 0)      options |= PCRE_UCP;
262    if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
263    
264  preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
265      &erroffset, NULL);
266  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
267    
268  if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);  /* Safety: if the error code is too big for the translation vector (which
269    should not happen, but we all make mistakes), return REG_BADPAT. */
270    
271    if (preg->re_pcre == NULL)
272      {
273      return (errorcode < sizeof(eint)/sizeof(const int))?
274        eint[errorcode] : REG_BADPAT;
275      }
276    
277  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
278  return 0;  return 0;
# Line 245  substring, so we have to get and release Line 290  substring, so we have to get and release
290  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
291  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
292  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
293  in a macro that can be changed at configure time. */  in a macro that can be changed at configure time.
294    
295    If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
296    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
297    the only result is yes/no/error. */
298    
299  EXPORT int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
300  regexec(const regex_t *preg, const char *string, size_t nmatch,  regexec(const regex_t *preg, const char *string, size_t nmatch,
301    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
302  {  {
303  int rc;  int rc, so, eo;
304  int options = 0;  int options = 0;
305  int *ovector = NULL;  int *ovector = NULL;
306  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
307  BOOL allocated_ovector = FALSE;  BOOL allocated_ovector = FALSE;
308    BOOL nosub =
309      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
310    
311  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
312  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
313    if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
314    
315  ((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 */
316    
317  if (nmatch > 0)  /* When no string data is being returned, or no vector has been passed in which
318    to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
319    the return data is large enough. */
320    
321    if (nosub || pmatch == NULL) nmatch = 0;
322    
323    else if (nmatch > 0)
324    {    {
325    if (nmatch <= POSIX_MALLOC_THRESHOLD)    if (nmatch <= POSIX_MALLOC_THRESHOLD)
326      {      {
# Line 270  if (nmatch > 0) Line 328  if (nmatch > 0)
328      }      }
329    else    else
330      {      {
331        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
332      ovector = (int *)malloc(sizeof(int) * nmatch * 3);      ovector = (int *)malloc(sizeof(int) * nmatch * 3);
333      if (ovector == NULL) return REG_ESPACE;      if (ovector == NULL) return REG_ESPACE;
334      allocated_ovector = TRUE;      allocated_ovector = TRUE;
335      }      }
336    }    }
337    
338  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.
339    0, options, ovector, nmatch * 3);  The man page from OS X says "REG_STARTEND affects only the location of the
340    string, not how it is matched". That is why the "so" value is used to bump the
341    start location rather than being passed as a PCRE "starting offset". */
342    
343  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */  if ((eflags & REG_STARTEND) != 0)
344      {
345      so = pmatch[0].rm_so;
346      eo = pmatch[0].rm_eo;
347      }
348    else
349      {
350      so = 0;
351      eo = (int)strlen(string);
352      }
353    
354    rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
355      0, options, ovector, (int)(nmatch * 3));
356    
357    if (rc == 0) rc = (int)nmatch;    /* All captured slots were filled in */
358    
359    /* Successful match */
360    
361  if (rc >= 0)  if (rc >= 0)
362    {    {
363    size_t i;    size_t i;
364    for (i = 0; i < (size_t)rc; i++)    if (!nosub)
365      {      {
366      pmatch[i].rm_so = ovector[i*2];      for (i = 0; i < (size_t)rc; i++)
367      pmatch[i].rm_eo = ovector[i*2+1];        {
368          pmatch[i].rm_so = ovector[i*2];
369          pmatch[i].rm_eo = ovector[i*2+1];
370          }
371        if (allocated_ovector) free(ovector);
372        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
373      }      }
   if (allocated_ovector) free(ovector);  
   for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;  
374    return 0;    return 0;
375    }    }
376    
377  else  /* Unsuccessful match */
378    
379    if (allocated_ovector) free(ovector);
380    switch(rc)
381    {    {
382    if (allocated_ovector) free(ovector);  /* ========================================================================== */
383    switch(rc)    /* These cases are never obeyed. This is a fudge that causes a compile-time
384      {    error if the vector eint, which is indexed by compile-time error number, is
385      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    not the correct length. It seems to be the only way to do such a check at
386      case PCRE_ERROR_NULL: return REG_INVARG;    compile time, as the sizeof() operator does not work in the C preprocessor.
387      case PCRE_ERROR_BADOPTION: return REG_INVARG;    As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
388      case PCRE_ERROR_BADMAGIC: return REG_INVARG;  
389      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;    case 0:
390      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;    case (sizeof(eint)/sizeof(int) == ERRCOUNT):
391      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;    return REG_ASSERT;
392      case PCRE_ERROR_BADUTF8: return REG_INVARG;  /* ========================================================================== */
393      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;  
394      default: return REG_ASSERT;    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
395      }    case PCRE_ERROR_NULL: return REG_INVARG;
396      case PCRE_ERROR_BADOPTION: return REG_INVARG;
397      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
398      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
399      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
400      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
401      case PCRE_ERROR_BADUTF8: return REG_INVARG;
402      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
403      default: return REG_ASSERT;
404    }    }
405  }  }
406    

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