1/************************************************* 2* Perl-Compatible Regular Expressions * 3*************************************************/ 4 5/* PCRE is a library of functions to support regular expressions whose syntax 6and 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----------------------------------------------------------------------------- 12Redistribution and use in source and binary forms, with or without 13modification, 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 26THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 27AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 30LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36POSSIBILITY OF SUCH DAMAGE. 37----------------------------------------------------------------------------- 38*/ 39 40 41/* This module is a wrapper that provides a POSIX API to the underlying PCRE 42functions. */ 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 51compiling these functions. This must come before including pcreposix.h, where 52they are set for an application (using these functions) if they have not 53previously 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 61are declared as "import" for Windows by defining PCRE_EXP_DECL as "import". 62This is needed even though pcre_internal.h itself includes pcre.h, because it 63does 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 72static 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 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 */ 168 169static const char *const pstring[] = { 170 "", /* Dummy for value 0 */ 171 "internal error", /* REG_ASSERT */ 172 "invalid repeat counts in {}", /* BADBR */ 173 "pattern error", /* BADPAT */ 174 "? * + invalid", /* BADRPT */ 175 "unbalanced {}", /* EBRACE */ 176 "unbalanced []", /* EBRACK */ 177 "collation error - not relevant", /* ECOLLATE */ 178 "bad class", /* ECTYPE */ 179 "bad escape sequence", /* EESCAPE */ 180 "empty expression", /* EMPTY */ 181 "unbalanced ()", /* EPAREN */ 182 "bad range inside []", /* ERANGE */ 183 "expression too big", /* ESIZE */ 184 "failed to get memory", /* ESPACE */ 185 "bad back reference", /* ESUBREG */ 186 "bad argument", /* INVARG */ 187 "match failed" /* NOMATCH */ 188}; 189 190 191 192 193/************************************************* 194* Translate error code to string * 195*************************************************/ 196 197PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION 198regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size) 199{ 200const char *message, *addmessage; 201size_t length, addlength; 202 203message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))? 204 "unknown error code" : pstring[errcode]; 205length = strlen(message) + 1; 206 207addmessage = " at offset "; 208addlength = (preg != NULL && (int)preg->re_erroffset != -1)? 209 strlen(addmessage) + 6 : 0; 210 211if (errbuf_size > 0) 212 { 213 if (addlength > 0 && errbuf_size >= length + addlength) 214 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset); 215 else 216 { 217 strncpy(errbuf, message, errbuf_size - 1); 218 errbuf[errbuf_size-1] = 0; 219 } 220 } 221 222return length + addlength; 223} 224 225 226 227 228/************************************************* 229* Free store held by a regex * 230*************************************************/ 231 232PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION 233regfree(regex_t *preg) 234{ 235(PUBL(free))(preg->re_pcre); 236} 237 238 239 240 241/************************************************* 242* Compile a regular expression * 243*************************************************/ 244 245/* 246Arguments: 247 preg points to a structure for recording the compiled expression 248 pattern the pattern to compile 249 cflags compilation flags 250 251Returns: 0 on success 252 various non-zero codes on failure 253*/ 254 255PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION 256regcomp(regex_t *preg, const char *pattern, int cflags) 257{ 258const char *errorptr; 259int erroffset; 260int errorcode; 261int options = 0; 262 263if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS; 264if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE; 265if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL; 266if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE; 267if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8; 268if ((cflags & REG_UCP) != 0) options |= PCRE_UCP; 269if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY; 270 271preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr, 272 &erroffset, NULL); 273preg->re_erroffset = erroffset; 274 275/* Safety: if the error code is too big for the translation vector (which 276should not happen, but we all make mistakes), return REG_BADPAT. */ 277 278if (preg->re_pcre == NULL) 279 { 280 return (errorcode < (int)(sizeof(eint)/sizeof(const int)))? 281 eint[errorcode] : REG_BADPAT; 282 } 283 284(void)pcre_fullinfo((const pcre *)preg->re_pcre, NULL, PCRE_INFO_CAPTURECOUNT, 285 &(preg->re_nsub)); 286return 0; 287} 288 289 290 291 292/************************************************* 293* Match a regular expression * 294*************************************************/ 295 296/* Unfortunately, PCRE requires 3 ints of working space for each captured 297substring, so we have to get and release working store instead of just using 298the POSIX structures as was done in earlier releases when PCRE needed only 2 299ints. However, if the number of possible capturing brackets is small, use a 300block of store on the stack, to reduce the use of malloc/free. The threshold is 301in a macro that can be changed at configure time. 302 303If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will 304be set. When this is the case, the nmatch and pmatch arguments are ignored, and 305the only result is yes/no/error. */ 306 307PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION 308regexec(const regex_t *preg, const char *string, size_t nmatch, 309 regmatch_t pmatch[], int eflags) 310{ 311int rc, so, eo; 312int options = 0; 313int *ovector = NULL; 314int small_ovector[POSIX_MALLOC_THRESHOLD * 3]; 315BOOL allocated_ovector = FALSE; 316BOOL nosub = 317 (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0; 318 319if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL; 320if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL; 321if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY; 322 323((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */ 324 325/* When no string data is being returned, or no vector has been passed in which 326to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding 327the return data is large enough. */ 328 329if (nosub || pmatch == NULL) nmatch = 0; 330 331else if (nmatch > 0) 332 { 333 if (nmatch <= POSIX_MALLOC_THRESHOLD) 334 { 335 ovector = &(small_ovector[0]); 336 } 337 else 338 { 339 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE; 340 ovector = (int *)malloc(sizeof(int) * nmatch * 3); 341 if (ovector == NULL) return REG_ESPACE; 342 allocated_ovector = TRUE; 343 } 344 } 345 346/* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings. 347The man page from OS X says "REG_STARTEND affects only the location of the 348string, not how it is matched". That is why the "so" value is used to bump the 349start location rather than being passed as a PCRE "starting offset". */ 350 351if ((eflags & REG_STARTEND) != 0) 352 { 353 so = pmatch[0].rm_so; 354 eo = pmatch[0].rm_eo; 355 } 356else 357 { 358 so = 0; 359 eo = (int)strlen(string); 360 } 361 362rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so), 363 0, options, ovector, (int)(nmatch * 3)); 364 365if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */ 366 367/* Successful match */ 368 369if (rc >= 0) 370 { 371 size_t i; 372 if (!nosub) 373 { 374 for (i = 0; i < (size_t)rc; i++) 375 { 376 pmatch[i].rm_so = ovector[i*2]; 377 pmatch[i].rm_eo = ovector[i*2+1]; 378 } 379 if (allocated_ovector) free(ovector); 380 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1; 381 } 382 return 0; 383 } 384 385/* Unsuccessful match */ 386 387if (allocated_ovector) free(ovector); 388switch(rc) 389 { 390/* ========================================================================== */ 391 /* These cases are never obeyed. This is a fudge that causes a compile-time 392 error if the vector eint, which is indexed by compile-time error number, is 393 not the correct length. It seems to be the only way to do such a check at 394 compile time, as the sizeof() operator does not work in the C preprocessor. 395 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */ 396 397 case 0: 398 case (sizeof(eint)/sizeof(int) == ERRCOUNT): 399 return REG_ASSERT; 400/* ========================================================================== */ 401 402 case PCRE_ERROR_NOMATCH: return REG_NOMATCH; 403 case PCRE_ERROR_NULL: return REG_INVARG; 404 case PCRE_ERROR_BADOPTION: return REG_INVARG; 405 case PCRE_ERROR_BADMAGIC: return REG_INVARG; 406 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT; 407 case PCRE_ERROR_NOMEMORY: return REG_ESPACE; 408 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE; 409 case PCRE_ERROR_BADUTF8: return REG_INVARG; 410 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG; 411 case PCRE_ERROR_BADMODE: return REG_INVARG; 412 default: return REG_ASSERT; 413 } 414} 415 416/* End of pcreposix.c */ 417