/[pcre]/code/trunk/pcreposix.c
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revision 77 by nigel, Sat Feb 24 21:40:45 2007 UTC revision 1024 by ph10, Wed Aug 29 11:08:24 2012 UTC
# Line 6  Line 6 
6  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.
7    
8                         Written by Philip Hazel                         Written by Philip Hazel
9             Copyright (c) 1997-2005 University of Cambridge             Copyright (c) 1997-2012 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 42  POSSIBILITY OF SUCH DAMAGE. Line 42  POSSIBILITY OF SUCH DAMAGE.
42  functions. */  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    /* 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"  #include "pcre_internal.h"
67  #include "pcreposix.h"  #include "pcreposix.h"
 #include "stdlib.h"  
   
68    
69    
70  /* Table to translate PCRE compile time error codes into POSIX error codes. */  /* Table to translate PCRE compile time error codes into POSIX error codes. */
# Line 56  static const int eint[] = { Line 75  static const int eint[] = {
75    REG_EESCAPE, /* \c at end of pattern */    REG_EESCAPE, /* \c at end of pattern */
76    REG_EESCAPE, /* unrecognized character follows \ */    REG_EESCAPE, /* unrecognized character follows \ */
77    REG_BADBR,   /* numbers out of order in {} quantifier */    REG_BADBR,   /* numbers out of order in {} quantifier */
78      /* 5 */
79    REG_BADBR,   /* number too big in {} quantifier */    REG_BADBR,   /* number too big in {} quantifier */
80    REG_EBRACK,  /* missing terminating ] for character class */    REG_EBRACK,  /* missing terminating ] for character class */
81    REG_ECTYPE,  /* invalid escape sequence in character class */    REG_ECTYPE,  /* invalid escape sequence in character class */
82    REG_ERANGE,  /* range out of order in character class */    REG_ERANGE,  /* range out of order in character class */
83    REG_BADRPT,  /* nothing to repeat */    REG_BADRPT,  /* nothing to repeat */
84      /* 10 */
85    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */    REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
86    REG_ASSERT,  /* internal error: unexpected repeat */    REG_ASSERT,  /* internal error: unexpected repeat */
87    REG_BADPAT,  /* unrecognized character after (? */    REG_BADPAT,  /* unrecognized character after (? */
88    REG_BADPAT,  /* POSIX named classes are supported only within a class */    REG_BADPAT,  /* POSIX named classes are supported only within a class */
89    REG_EPAREN,  /* missing ) */    REG_EPAREN,  /* missing ) */
90      /* 15 */
91    REG_ESUBREG, /* reference to non-existent subpattern */    REG_ESUBREG, /* reference to non-existent subpattern */
92    REG_INVARG,  /* erroffset passed as NULL */    REG_INVARG,  /* erroffset passed as NULL */
93    REG_INVARG,  /* unknown option bit(s) set */    REG_INVARG,  /* unknown option bit(s) set */
94    REG_EPAREN,  /* missing ) after comment */    REG_EPAREN,  /* missing ) after comment */
95    REG_ESIZE,   /* parentheses nested too deeply */    REG_ESIZE,   /* parentheses nested too deeply */
96      /* 20 */
97    REG_ESIZE,   /* regular expression too large */    REG_ESIZE,   /* regular expression too large */
98    REG_ESPACE,  /* failed to get memory */    REG_ESPACE,  /* failed to get memory */
99    REG_EPAREN,  /* unmatched brackets */    REG_EPAREN,  /* unmatched parentheses */
100    REG_ASSERT,  /* internal error: code overflow */    REG_ASSERT,  /* internal error: code overflow */
101    REG_BADPAT,  /* unrecognized character after (?< */    REG_BADPAT,  /* unrecognized character after (?< */
102      /* 25 */
103    REG_BADPAT,  /* lookbehind assertion is not fixed length */    REG_BADPAT,  /* lookbehind assertion is not fixed length */
104    REG_BADPAT,  /* malformed number after (?( */    REG_BADPAT,  /* malformed number or name after (?( */
105    REG_BADPAT,  /* conditional group containe more than two branches */    REG_BADPAT,  /* conditional group contains more than two branches */
106    REG_BADPAT,  /* assertion expected after (?( */    REG_BADPAT,  /* assertion expected after (?( */
107    REG_BADPAT,  /* (?R or (?digits must be followed by ) */    REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
108      /* 30 */
109    REG_ECTYPE,  /* unknown POSIX class name */    REG_ECTYPE,  /* unknown POSIX class name */
110    REG_BADPAT,  /* POSIX collating elements are not supported */    REG_BADPAT,  /* POSIX collating elements are not supported */
111    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */    REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
112    REG_BADPAT,  /* spare error */    REG_BADPAT,  /* spare error */
113    REG_BADPAT,  /* character value in \x{...} sequence is too large */    REG_BADPAT,  /* character value in \x{...} sequence is too large */
114      /* 35 */
115    REG_BADPAT,  /* invalid condition (?(0) */    REG_BADPAT,  /* invalid condition (?(0) */
116    REG_BADPAT,  /* \C not allowed in lookbehind assertion */    REG_BADPAT,  /* \C not allowed in lookbehind assertion */
117    REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */    REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
118    REG_BADPAT,  /* number after (?C is > 255 */    REG_BADPAT,  /* number after (?C is > 255 */
119    REG_BADPAT,  /* closing ) for (?C expected */    REG_BADPAT,  /* closing ) for (?C expected */
120      /* 40 */
121    REG_BADPAT,  /* recursive call could loop indefinitely */    REG_BADPAT,  /* recursive call could loop indefinitely */
122    REG_BADPAT,  /* unrecognized character after (?P */    REG_BADPAT,  /* unrecognized character after (?P */
123    REG_BADPAT,  /* syntax error after (?P */    REG_BADPAT,  /* syntax error in subpattern name (missing terminator) */
124    REG_BADPAT,  /* two named groups have the same name */    REG_BADPAT,  /* two named subpatterns have the same name */
125    REG_BADPAT,  /* invalid UTF-8 string */    REG_BADPAT,  /* invalid UTF-8 string */
126      /* 45 */
127    REG_BADPAT,  /* support for \P, \p, and \X has not been compiled */    REG_BADPAT,  /* support for \P, \p, and \X has not been compiled */
128    REG_BADPAT,  /* malformed \P or \p sequence */    REG_BADPAT,  /* malformed \P or \p sequence */
129    REG_BADPAT   /* unknown property name after \P or \p */    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      REG_BADPAT,  /* \N is not supported in a class */
159      REG_BADPAT,  /* too many forward references */
160      REG_BADPAT,  /* disallowed UTF-8/16 code point (>= 0xd800 && <= 0xdfff) */
161      REG_BADPAT,  /* invalid UTF-16 string (should not occur) */
162      /* 75 */
163      REG_BADPAT,  /* overlong MARK name */
164      REG_BADPAT   /* character value in \u.... sequence is too large */
165  };  };
166    
167  /* Table of texts corresponding to POSIX error codes */  /* Table of texts corresponding to POSIX error codes */
# Line 131  static const char *const pstring[] = { Line 194  static const char *const pstring[] = {
194  *          Translate error code to string        *  *          Translate error code to string        *
195  *************************************************/  *************************************************/
196    
197  EXPORT size_t  PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
198  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)
199  {  {
200  const char *message, *addmessage;  const char *message, *addmessage;
# Line 166  return length + addlength; Line 229  return length + addlength;
229  *           Free store held by a regex           *  *           Free store held by a regex           *
230  *************************************************/  *************************************************/
231    
232  EXPORT void  PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
233  regfree(regex_t *preg)  regfree(regex_t *preg)
234  {  {
235  (pcre_free)(preg->re_pcre);  (PUBL(free))(preg->re_pcre);
236  }  }
237    
238    
# Line 189  Returns:      0 on success Line 252  Returns:      0 on success
252                various non-zero codes on failure                various non-zero codes on failure
253  */  */
254    
255  EXPORT int  PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
256  regcomp(regex_t *preg, const char *pattern, int cflags)  regcomp(regex_t *preg, const char *pattern, int cflags)
257  {  {
258  const char *errorptr;  const char *errorptr;
259  int erroffset;  int erroffset;
260  int errorcode;  int errorcode;
261  int options = 0;  int options = 0;
262    int re_nsub = 0;
263    
264  if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;  if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
265  if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;  if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
266  if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;  if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
267    if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
268    if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
269    if ((cflags & REG_UCP) != 0)      options |= PCRE_UCP;
270    if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
271    
272  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,  preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
273    &erroffset, NULL);    &erroffset, NULL);
274  preg->re_erroffset = erroffset;  preg->re_erroffset = erroffset;
275    
276  if (preg->re_pcre == NULL) return eint[errorcode];  /* Safety: if the error code is too big for the translation vector (which
277    should not happen, but we all make mistakes), return REG_BADPAT. */
278    
279    if (preg->re_pcre == NULL)
280      {
281      return (errorcode < (int)(sizeof(eint)/sizeof(const int)))?
282        eint[errorcode] : REG_BADPAT;
283      }
284    
285  preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);  (void)pcre_fullinfo((const pcre *)preg->re_pcre, NULL, PCRE_INFO_CAPTURECOUNT,
286      &re_nsub);
287    preg->re_nsub = (size_t)re_nsub;
288  return 0;  return 0;
289  }  }
290    
# Line 223  substring, so we have to get and release Line 300  substring, so we have to get and release
300  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
301  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
302  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
303  in a macro that can be changed at configure time. */  in a macro that can be changed at configure time.
304    
305  EXPORT int  If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
306    be set. When this is the case, the nmatch and pmatch arguments are ignored, and
307    the only result is yes/no/error. */
308    
309    PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
310  regexec(const regex_t *preg, const char *string, size_t nmatch,  regexec(const regex_t *preg, const char *string, size_t nmatch,
311    regmatch_t pmatch[], int eflags)    regmatch_t pmatch[], int eflags)
312  {  {
313  int rc;  int rc, so, eo;
314  int options = 0;  int options = 0;
315  int *ovector = NULL;  int *ovector = NULL;
316  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];  int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
317  BOOL allocated_ovector = FALSE;  BOOL allocated_ovector = FALSE;
318    BOOL nosub =
319      (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
320    
321  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;  if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
322  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;  if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
323    if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
324    
325  ((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 */
326    
327  if (nmatch > 0)  /* When no string data is being returned, or no vector has been passed in which
328    to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
329    the return data is large enough. */
330    
331    if (nosub || pmatch == NULL) nmatch = 0;
332    
333    else if (nmatch > 0)
334    {    {
335    if (nmatch <= POSIX_MALLOC_THRESHOLD)    if (nmatch <= POSIX_MALLOC_THRESHOLD)
336      {      {
# Line 248  if (nmatch > 0) Line 338  if (nmatch > 0)
338      }      }
339    else    else
340      {      {
341        if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
342      ovector = (int *)malloc(sizeof(int) * nmatch * 3);      ovector = (int *)malloc(sizeof(int) * nmatch * 3);
343      if (ovector == NULL) return REG_ESPACE;      if (ovector == NULL) return REG_ESPACE;
344      allocated_ovector = TRUE;      allocated_ovector = TRUE;
345      }      }
346    }    }
347    
348  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.
349    0, options, ovector, nmatch * 3);  The man page from OS X says "REG_STARTEND affects only the location of the
350    string, not how it is matched". That is why the "so" value is used to bump the
351    start location rather than being passed as a PCRE "starting offset". */
352    
353    if ((eflags & REG_STARTEND) != 0)
354      {
355      so = pmatch[0].rm_so;
356      eo = pmatch[0].rm_eo;
357      }
358    else
359      {
360      so = 0;
361      eo = (int)strlen(string);
362      }
363    
364    rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
365      0, options, ovector, (int)(nmatch * 3));
366    
367  if (rc == 0) rc = nmatch;    /* All captured slots were filled in */  if (rc == 0) rc = (int)nmatch;    /* All captured slots were filled in */
368    
369    /* Successful match */
370    
371  if (rc >= 0)  if (rc >= 0)
372    {    {
373    size_t i;    size_t i;
374    for (i = 0; i < (size_t)rc; i++)    if (!nosub)
375      {      {
376      pmatch[i].rm_so = ovector[i*2];      for (i = 0; i < (size_t)rc; i++)
377      pmatch[i].rm_eo = ovector[i*2+1];        {
378          pmatch[i].rm_so = ovector[i*2];
379          pmatch[i].rm_eo = ovector[i*2+1];
380          }
381        if (allocated_ovector) free(ovector);
382        for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
383      }      }
   if (allocated_ovector) free(ovector);  
   for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;  
384    return 0;    return 0;
385    }    }
386    
387  else  /* Unsuccessful match */
388    
389    if (allocated_ovector) free(ovector);
390    switch(rc)
391    {    {
392    if (allocated_ovector) free(ovector);  /* ========================================================================== */
393    switch(rc)    /* These cases are never obeyed. This is a fudge that causes a compile-time
394      {    error if the vector eint, which is indexed by compile-time error number, is
395      case PCRE_ERROR_NOMATCH: return REG_NOMATCH;    not the correct length. It seems to be the only way to do such a check at
396      case PCRE_ERROR_NULL: return REG_INVARG;    compile time, as the sizeof() operator does not work in the C preprocessor.
397      case PCRE_ERROR_BADOPTION: return REG_INVARG;    As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
398      case PCRE_ERROR_BADMAGIC: return REG_INVARG;  
399      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;    case 0:
400      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;    case (sizeof(eint)/sizeof(int) == ERRCOUNT):
401      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;    return REG_ASSERT;
402      case PCRE_ERROR_BADUTF8: return REG_INVARG;  /* ========================================================================== */
403      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;  
404      default: return REG_ASSERT;    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
405      }    case PCRE_ERROR_NULL: return REG_INVARG;
406      case PCRE_ERROR_BADOPTION: return REG_INVARG;
407      case PCRE_ERROR_BADMAGIC: return REG_INVARG;
408      case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
409      case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
410      case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
411      case PCRE_ERROR_BADUTF8: return REG_INVARG;
412      case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
413      case PCRE_ERROR_BADMODE: return REG_INVARG;
414      default: return REG_ASSERT;
415    }    }
416  }  }
417    

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