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) 1997-2014 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{} or \o{} 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   REG_BADPAT,  /* setting UTF is disabled by the application */
 167   REG_BADPAT,  /* non-hex character in \\x{} (closing brace missing?) */
 168   /* 80 */
 169   REG_BADPAT,  /* non-octal character in \o{} (closing brace missing?) */
 170   REG_BADPAT,  /* missing opening brace after \o */
 171   REG_BADPAT,  /* parentheses too deeply nested */
 172   REG_BADPAT,  /* invalid range in character class */
 173   REG_BADPAT,  /* group name must start with a non-digit */
 174   /* 85 */
 175   REG_BADPAT   /* parentheses too deeply nested (stack check) */
 176 };
 177
 178 /* Table of texts corresponding to POSIX error codes */
 179
 180 static const char *const pstring[] = {
 181   "",                                /* Dummy for value 0 */
 182   "internal error",                  /* REG_ASSERT */
 183   "invalid repeat counts in {}",     /* BADBR      */
 184   "pattern error",                   /* BADPAT     */
 185   "? * + invalid",                   /* BADRPT     */
 186   "unbalanced {}",                   /* EBRACE     */
 187   "unbalanced []",                   /* EBRACK     */
 188   "collation error - not relevant",  /* ECOLLATE   */
 189   "bad class",                       /* ECTYPE     */
 190   "bad escape sequence",             /* EESCAPE    */
 191   "empty expression",                /* EMPTY      */
 192   "unbalanced ()",                   /* EPAREN     */
 193   "bad range inside []",             /* ERANGE     */
 194   "expression too big",              /* ESIZE      */
 195   "failed to get memory",            /* ESPACE     */
 196   "bad back reference",              /* ESUBREG    */
 197   "bad argument",                    /* INVARG     */
 198   "match failed"                     /* NOMATCH    */
 199 };
 200
 201
 202
 203
 204 /*************************************************
 205 *          Translate error code to string        *
 206 *************************************************/
 207
 208 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
 209 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
 210 {
 211 const char *message, *addmessage;
 212 size_t length, addlength;
 213
 214 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
 215   "unknown error code" : pstring[errcode];
 216 length = strlen(message) + 1;
 217
 218 addmessage = " at offset ";
 219 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
 220   strlen(addmessage) + 6 : 0;
 221
 222 if (errbuf_size > 0)
 223   {
 224   if (addlength > 0 && errbuf_size >= length + addlength)
 225     sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
 226   else
 227     {
 228     strncpy(errbuf, message, errbuf_size - 1);
 229     errbuf[errbuf_size-1] = 0;
 230     }
 231   }
 232
 233 return length + addlength;
 234 }
 235
 236
 237
 238
 239 /*************************************************
 240 *           Free store held by a regex           *
 241 *************************************************/
 242
 243 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
 244 regfree(regex_t *preg)
 245 {
 246 (PUBL(free))(preg->re_pcre);
 247 }
 248
 249
 250
 251
 252 /*************************************************
 253 *            Compile a regular expression        *
 254 *************************************************/
 255
 256 /*
 257 Arguments:
 258   preg        points to a structure for recording the compiled expression
 259   pattern     the pattern to compile
 260   cflags      compilation flags
 261
 262 Returns:      0 on success
 263               various non-zero codes on failure
 264 */
 265
 266 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
 267 regcomp(regex_t *preg, const char *pattern, int cflags)
 268 {
 269 const char *errorptr;
 270 int erroffset;
 271 int errorcode;
 272 int options = 0;
 273 int re_nsub = 0;
 274
 275 if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
 276 if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
 277 if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
 278 if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
 279 if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
 280 if ((cflags & REG_UCP) != 0)      options |= PCRE_UCP;
 281 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
 282
 283 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
 284   &erroffset, NULL);
 285 preg->re_erroffset = erroffset;
 286
 287 /* Safety: if the error code is too big for the translation vector (which
 288 should not happen, but we all make mistakes), return REG_BADPAT. */
 289
 290 if (preg->re_pcre == NULL)
 291   {
 292   return (errorcode < (int)(sizeof(eint)/sizeof(const int)))?
 293     eint[errorcode] : REG_BADPAT;
 294   }
 295
 296 (void)pcre_fullinfo((const pcre *)preg->re_pcre, NULL, PCRE_INFO_CAPTURECOUNT,
 297   &re_nsub);
 298 preg->re_nsub = (size_t)re_nsub;
 299 return 0;
 300 }
 301
 302
 303
 304
 305 /*************************************************
 306 *              Match a regular expression        *
 307 *************************************************/
 308
 309 /* Unfortunately, PCRE requires 3 ints of working space for each captured
 310 substring, so we have to get and release working store instead of just using
 311 the POSIX structures as was done in earlier releases when PCRE needed only 2
 312 ints. However, if the number of possible capturing brackets is small, use a
 313 block of store on the stack, to reduce the use of malloc/free. The threshold is
 314 in a macro that can be changed at configure time.
 315
 316 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
 317 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
 318 the only result is yes/no/error. */
 319
 320 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
 321 regexec(const regex_t *preg, const char *string, size_t nmatch,
 322   regmatch_t pmatch[], int eflags)
 323 {
 324 int rc, so, eo;
 325 int options = 0;
 326 int *ovector = NULL;
 327 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
 328 BOOL allocated_ovector = FALSE;
 329 BOOL nosub =
 330   (REAL_PCRE_OPTIONS((const pcre *)preg->re_pcre) & PCRE_NO_AUTO_CAPTURE) != 0;
 331
 332 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
 333 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
 334 if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
 335
 336 ((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */
 337
 338 /* When no string data is being returned, or no vector has been passed in which
 339 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
 340 the return data is large enough. */
 341
 342 if (nosub || pmatch == NULL) nmatch = 0;
 343
 344 else if (nmatch > 0)
 345   {
 346   if (nmatch <= POSIX_MALLOC_THRESHOLD)
 347     {
 348     ovector = &(small_ovector[0]);
 349     }
 350   else
 351     {
 352     if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
 353     ovector = (int *)malloc(sizeof(int) * nmatch * 3);
 354     if (ovector == NULL) return REG_ESPACE;
 355     allocated_ovector = TRUE;
 356     }
 357   }
 358
 359 /* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
 360 The man page from OS X says "REG_STARTEND affects only the location of the
 361 string, not how it is matched". That is why the "so" value is used to bump the
 362 start location rather than being passed as a PCRE "starting offset". */
 363
 364 if ((eflags & REG_STARTEND) != 0)
 365   {
 366   so = pmatch[0].rm_so;
 367   eo = pmatch[0].rm_eo;
 368   }
 369 else
 370   {
 371   so = 0;
 372   eo = (int)strlen(string);
 373   }
 374
 375 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
 376   0, options, ovector, (int)(nmatch * 3));
 377
 378 if (rc == 0) rc = (int)nmatch;    /* All captured slots were filled in */
 379
 380 /* Successful match */
 381
 382 if (rc >= 0)
 383   {
 384   size_t i;
 385   if (!nosub)
 386     {
 387     for (i = 0; i < (size_t)rc; i++)
 388       {
 389       pmatch[i].rm_so = ovector[i*2];
 390       pmatch[i].rm_eo = ovector[i*2+1];
 391       }
 392     if (allocated_ovector) free(ovector);
 393     for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
 394     }
 395   return 0;
 396   }
 397
 398 /* Unsuccessful match */
 399
 400 if (allocated_ovector) free(ovector);
 401 switch(rc)
 402   {
 403 /* ========================================================================== */
 404   /* These cases are never obeyed. This is a fudge that causes a compile-time
 405   error if the vector eint, which is indexed by compile-time error number, is
 406   not the correct length. It seems to be the only way to do such a check at
 407   compile time, as the sizeof() operator does not work in the C preprocessor.
 408   As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
 409
 410   case 0:
 411   case (sizeof(eint)/sizeof(int) == ERRCOUNT):
 412   return REG_ASSERT;
 413 /* ========================================================================== */
 414
 415   case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
 416   case PCRE_ERROR_NULL: return REG_INVARG;
 417   case PCRE_ERROR_BADOPTION: return REG_INVARG;
 418   case PCRE_ERROR_BADMAGIC: return REG_INVARG;
 419   case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
 420   case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
 421   case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
 422   case PCRE_ERROR_BADUTF8: return REG_INVARG;
 423   case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
 424   case PCRE_ERROR_BADMODE: return REG_INVARG;
 425   default: return REG_ASSERT;
 426   }
 427 }
 428
 429 /* End of pcreposix.c */