release/src/router/pcre/pcreposix.c

   1 /*************************************************
   2 *      Perl-Compatible Regular Expressions       *
   3 *************************************************/
   4
   5 /* PCRE is a library of functions to support regular expressions whose syntax
   6 and semantics are as close as possible to those of the Perl 5 language.
   7
   8                        Written by Philip Hazel
   9            Copyright (c) 1997-2012 University of Cambridge
  10
  11 -----------------------------------------------------------------------------
  12 Redistribution and use in source and binary forms, with or without
  13 modification, are permitted provided that the following conditions are met:
  14
  15     * Redistributions of source code must retain the above copyright notice,
  16       this list of conditions and the following disclaimer.
  17
  18     * Redistributions in binary form must reproduce the above copyright
  19       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
  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 /* 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"
  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[] = {
  73   0,           /* no error */
  74   REG_EESCAPE, /* \ at end of pattern */
  75   REG_EESCAPE, /* \c at end of pattern */
  76   REG_EESCAPE, /* unrecognized character follows \ */
  77   REG_BADBR,   /* numbers out of order in {} quantifier */
  78   /* 5 */
  79   REG_BADBR,   /* number too big in {} quantifier */
  80   REG_EBRACK,  /* missing terminating ] for character class */
  81   REG_ECTYPE,  /* invalid escape sequence in character class */
  82   REG_ERANGE,  /* range out of order in character class */
  83   REG_BADRPT,  /* nothing to repeat */
  84   /* 10 */
  85   REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
  86   REG_ASSERT,  /* internal error: unexpected repeat */
  87   REG_BADPAT,  /* unrecognized character after (? */
  88   REG_BADPAT,  /* POSIX named classes are supported only within a class */
  89   REG_EPAREN,  /* missing ) */
  90   /* 15 */
  91   REG_ESUBREG, /* reference to non-existent subpattern */
  92   REG_INVARG,  /* erroffset passed as NULL */
  93   REG_INVARG,  /* unknown option bit(s) set */
  94   REG_EPAREN,  /* missing ) after comment */
  95   REG_ESIZE,   /* parentheses nested too deeply */
  96   /* 20 */
  97   REG_ESIZE,   /* regular expression too large */
  98   REG_ESPACE,  /* failed to get memory */
  99   REG_EPAREN,  /* unmatched parentheses */
 100   REG_ASSERT,  /* internal error: code overflow */
 101   REG_BADPAT,  /* unrecognized character after (?< */
 102   /* 25 */
 103   REG_BADPAT,  /* lookbehind assertion is not fixed length */
 104   REG_BADPAT,  /* malformed number or name after (?( */
 105   REG_BADPAT,  /* conditional group contains more than two branches */
 106   REG_BADPAT,  /* assertion expected after (?( */
 107   REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
 108   /* 30 */
 109   REG_ECTYPE,  /* unknown POSIX class name */
 110   REG_BADPAT,  /* POSIX collating elements are not supported */
 111   REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
 112   REG_BADPAT,  /* spare error */
 113   REG_BADPAT,  /* character value in \x{...} sequence is too large */
 114   /* 35 */
 115   REG_BADPAT,  /* invalid condition (?(0) */
 116   REG_BADPAT,  /* \C not allowed in lookbehind assertion */
 117   REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
 118   REG_BADPAT,  /* number after (?C is > 255 */
 119   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   REG_BADPAT,  /* \N is not supported in a class */
 159   REG_BADPAT,  /* too many forward references */
 160   REG_BADPAT,  /* disallowed UTF-8/16/32 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   REG_BADPAT   /* invalid UTF-32 string (should not occur) */
 166 };
 167
 168 /* Table of texts corresponding to POSIX error codes */
 169
 170 static const char *const pstring[] = {
 171   "",                                /* Dummy for value 0 */
 172   "internal error",                  /* REG_ASSERT */
 173   "invalid repeat counts in {}",     /* BADBR      */
 174   "pattern error",                   /* BADPAT     */
 175   "? * + invalid",                   /* BADRPT     */
 176   "unbalanced {}",                   /* EBRACE     */
 177   "unbalanced []",                   /* EBRACK     */
 178   "collation error - not relevant",  /* ECOLLATE   */
 179   "bad class",                       /* ECTYPE     */
 180   "bad escape sequence",             /* EESCAPE    */
 181   "empty expression",                /* EMPTY      */
 182   "unbalanced ()",                   /* EPAREN     */
 183   "bad range inside []",             /* ERANGE     */
 184   "expression too big",              /* ESIZE      */
 185   "failed to get memory",            /* ESPACE     */
 186   "bad back reference",              /* ESUBREG    */
 187   "bad argument",                    /* INVARG     */
 188   "match failed"                     /* NOMATCH    */
 189 };
 190
 191
 192
 193
 194 /*************************************************
 195 *          Translate error code to string        *
 196 *************************************************/
 197
 198 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
 199 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
 200 {
 201 const char *message, *addmessage;
 202 size_t length, addlength;
 203
 204 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
 205   "unknown error code" : pstring[errcode];
 206 length = strlen(message) + 1;
 207
 208 addmessage = " at offset ";
 209 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
 210   strlen(addmessage) + 6 : 0;
 211
 212 if (errbuf_size > 0)
 213   {
 214   if (addlength > 0 && errbuf_size >= length + addlength)
 215     sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
 216   else
 217     {
 218     strncpy(errbuf, message, errbuf_size - 1);
 219     errbuf[errbuf_size-1] = 0;
 220     }
 221   }
 222
 223 return length + addlength;
 224 }
 225
 226
 227
 228
 229 /*************************************************
 230 *           Free store held by a regex           *
 231 *************************************************/
 232
 233 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
 234 regfree(regex_t *preg)
 235 {
 236 (PUBL(free))(preg->re_pcre);
 237 }
 238
 239
 240
 241
 242 /*************************************************
 243 *            Compile a regular expression        *
 244 *************************************************/
 245
 246 /*
 247 Arguments:
 248   preg        points to a structure for recording the compiled expression
 249   pattern     the pattern to compile
 250   cflags      compilation flags
 251
 252 Returns:      0 on success
 253               various non-zero codes on failure
 254 */
 255
 256 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
 257 regcomp(regex_t *preg, const char *pattern, int cflags)
 258 {
 259 const char *errorptr;
 260 int erroffset;
 261 int errorcode;
 262 int options = 0;
 263 int re_nsub = 0;
 264
 265 if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
 266 if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
 267 if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
 268 if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
 269 if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
 270 if ((cflags & REG_UCP) != 0)      options |= PCRE_UCP;
 271 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
 272
 273 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
 274   &erroffset, NULL);
 275 preg->re_erroffset = erroffset;
 276
 277 /* Safety: if the error code is too big for the translation vector (which
 278 should not happen, but we all make mistakes), return REG_BADPAT. */
 279
 280 if (preg->re_pcre == NULL)
 281   {
 282   return (errorcode < (int)(sizeof(eint)/sizeof(const int)))?
 283     eint[errorcode] : REG_BADPAT;
 284   }
 285
 286 (void)pcre_fullinfo((const pcre *)preg->re_pcre, NULL, PCRE_INFO_CAPTURECOUNT,
 287   &re_nsub);
 288 preg->re_nsub = (size_t)re_nsub;
 289 return 0;
 290 }
 291
 292
 293
 294
 295 /*************************************************
 296 *              Match a regular expression        *
 297 *************************************************/
 298
 299 /* Unfortunately, PCRE requires 3 ints of working space for each captured
 300 substring, so we have to get and release working store instead of just using
 301 the POSIX structures as was done in earlier releases when PCRE needed only 2
 302 ints. However, if the number of possible capturing brackets is small, use a
 303 block of store on the stack, to reduce the use of malloc/free. The threshold is
 304 in a macro that can be changed at configure time.
 305
 306 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
 307 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
 308 the only result is yes/no/error. */
 309
 310 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
 311 regexec(const regex_t *preg, const char *string, size_t nmatch,
 312   regmatch_t pmatch[], int eflags)
 313 {
 314 int rc, so, eo;
 315 int options = 0;
 316 int *ovector = NULL;
 317 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
 318 BOOL allocated_ovector = FALSE;
 319 BOOL nosub =
 320   (REAL_PCRE_OPTIONS((const pcre *)preg->re_pcre) & PCRE_NO_AUTO_CAPTURE) != 0;
 321
 322 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
 323 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
 324 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
 325
 326 ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
 327
 328 /* When no string data is being returned, or no vector has been passed in which
 329 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
 330 the return data is large enough. */
 331
 332 if (nosub || pmatch == NULL) nmatch = 0;
 333
 334 else if (nmatch > 0)
 335   {
 336   if (nmatch <= POSIX_MALLOC_THRESHOLD)
 337     {
 338     ovector = &(small_ovector[0]);
 339     }
 340   else
 341     {
 342     if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
 343     ovector = (int *)malloc(sizeof(int) * nmatch * 3);
 344     if (ovector == NULL) return REG_ESPACE;
 345     allocated_ovector = TRUE;
 346     }
 347   }
 348
 349 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
 350 The man page from OS X says "REG_STARTEND affects only the location of the
 351 string, not how it is matched". That is why the "so" value is used to bump the
 352 start location rather than being passed as a PCRE "starting offset". */
 353
 354 if ((eflags & REG_STARTEND) != 0)
 355   {
 356   so = pmatch[0].rm_so;
 357   eo = pmatch[0].rm_eo;
 358   }
 359 else
 360   {
 361   so = 0;
 362   eo = (int)strlen(string);
 363   }
 364
 365 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
 366   0, options, ovector, (int)(nmatch * 3));
 367
 368 if (rc == 0) rc = (int)nmatch;    /* All captured slots were filled in */
 369
 370 /* Successful match */
 371
 372 if (rc >= 0)
 373   {
 374   size_t i;
 375   if (!nosub)
 376     {
 377     for (i = 0; i < (size_t)rc; i++)
 378       {
 379       pmatch[i].rm_so = ovector[i*2];
 380       pmatch[i].rm_eo = ovector[i*2+1];
 381       }
 382     if (allocated_ovector) free(ovector);
 383     for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
 384     }
 385   return 0;
 386   }
 387
 388 /* Unsuccessful match */
 389
 390 if (allocated_ovector) free(ovector);
 391 switch(rc)
 392   {
 393 /* ========================================================================== */
 394   /* These cases are never obeyed. This is a fudge that causes a compile-time
 395   error if the vector eint, which is indexed by compile-time error number, is
 396   not the correct length. It seems to be the only way to do such a check at
 397   compile time, as the sizeof() operator does not work in the C preprocessor.
 398   As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
 399
 400   case 0:
 401   case (sizeof(eint)/sizeof(int) == ERRCOUNT):
 402   return REG_ASSERT;
 403 /* ========================================================================== */
 404
 405   case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
 406   case PCRE_ERROR_NULL: return REG_INVARG;
 407   case PCRE_ERROR_BADOPTION: return REG_INVARG;
 408   case PCRE_ERROR_BADMAGIC: return REG_INVARG;
 409   case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
 410   case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
 411   case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
 412   case PCRE_ERROR_BADUTF8: return REG_INVARG;
 413   case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
 414   case PCRE_ERROR_BADMODE: return REG_INVARG;
 415   default: return REG_ASSERT;
 416   }
 417 }
 418
 419 /* End of pcreposix.c */