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) 1997-2016 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{} 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 REG_BADPAT, /* missing digits in \x{} or \o{} */ 177 REG_BADPAT /* pattern too complicated */ 178}; 179 180/* Table of texts corresponding to POSIX error codes */ 181 182static const char *const pstring[] = { 183 "", /* Dummy for value 0 */ 184 "internal error", /* REG_ASSERT */ 185 "invalid repeat counts in {}", /* BADBR */ 186 "pattern error", /* BADPAT */ 187 "? * + invalid", /* BADRPT */ 188 "unbalanced {}", /* EBRACE */ 189 "unbalanced []", /* EBRACK */ 190 "collation error - not relevant", /* ECOLLATE */ 191 "bad class", /* ECTYPE */ 192 "bad escape sequence", /* EESCAPE */ 193 "empty expression", /* EMPTY */ 194 "unbalanced ()", /* EPAREN */ 195 "bad range inside []", /* ERANGE */ 196 "expression too big", /* ESIZE */ 197 "failed to get memory", /* ESPACE */ 198 "bad back reference", /* ESUBREG */ 199 "bad argument", /* INVARG */ 200 "match failed" /* NOMATCH */ 201}; 202 203 204 205 206/************************************************* 207* Translate error code to string * 208*************************************************/ 209 210PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION 211regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size) 212{ 213const char *message, *addmessage; 214size_t length, addlength; 215 216message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))? 217 "unknown error code" : pstring[errcode]; 218length = strlen(message) + 1; 219 220addmessage = " at offset "; 221addlength = (preg != NULL && (int)preg->re_erroffset != -1)? 222 strlen(addmessage) + 6 : 0; 223 224if (errbuf_size > 0) 225 { 226 if (addlength > 0 && errbuf_size >= length + addlength) 227 sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset); 228 else 229 { 230 strncpy(errbuf, message, errbuf_size - 1); 231 errbuf[errbuf_size-1] = 0; 232 } 233 } 234 235return length + addlength; 236} 237 238 239 240 241/************************************************* 242* Free store held by a regex * 243*************************************************/ 244 245PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION 246regfree(regex_t *preg) 247{ 248(PUBL(free))(preg->re_pcre); 249} 250 251 252 253 254/************************************************* 255* Compile a regular expression * 256*************************************************/ 257 258/* 259Arguments: 260 preg points to a structure for recording the compiled expression 261 pattern the pattern to compile 262 cflags compilation flags 263 264Returns: 0 on success 265 various non-zero codes on failure 266*/ 267 268PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION 269regcomp(regex_t *preg, const char *pattern, int cflags) 270{ 271const char *errorptr; 272int erroffset; 273int errorcode; 274int options = 0; 275int re_nsub = 0; 276 277if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS; 278if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE; 279if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL; 280if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE; 281if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8; 282if ((cflags & REG_UCP) != 0) options |= PCRE_UCP; 283if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY; 284 285preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr, 286 &erroffset, NULL); 287preg->re_erroffset = erroffset; 288 289/* Safety: if the error code is too big for the translation vector (which 290should not happen, but we all make mistakes), return REG_BADPAT. */ 291 292if (preg->re_pcre == NULL) 293 { 294 return (errorcode < (int)(sizeof(eint)/sizeof(const int)))? 295 eint[errorcode] : REG_BADPAT; 296 } 297 298(void)pcre_fullinfo((const pcre *)preg->re_pcre, NULL, PCRE_INFO_CAPTURECOUNT, 299 &re_nsub); 300preg->re_nsub = (size_t)re_nsub; 301return 0; 302} 303 304 305 306 307/************************************************* 308* Match a regular expression * 309*************************************************/ 310 311/* Unfortunately, PCRE requires 3 ints of working space for each captured 312substring, so we have to get and release working store instead of just using 313the POSIX structures as was done in earlier releases when PCRE needed only 2 314ints. However, if the number of possible capturing brackets is small, use a 315block of store on the stack, to reduce the use of malloc/free. The threshold is 316in a macro that can be changed at configure time. 317 318If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will 319be set. When this is the case, the nmatch and pmatch arguments are ignored, and 320the only result is yes/no/error. */ 321 322PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION 323regexec(const regex_t *preg, const char *string, size_t nmatch, 324 regmatch_t pmatch[], int eflags) 325{ 326int rc, so, eo; 327int options = 0; 328int *ovector = NULL; 329int small_ovector[POSIX_MALLOC_THRESHOLD * 3]; 330BOOL allocated_ovector = FALSE; 331BOOL nosub = 332 (REAL_PCRE_OPTIONS((const pcre *)preg->re_pcre) & PCRE_NO_AUTO_CAPTURE) != 0; 333 334if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL; 335if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL; 336if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY; 337 338((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */ 339 340/* When no string data is being returned, or no vector has been passed in which 341to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding 342the return data is large enough. */ 343 344if (nosub || pmatch == NULL) nmatch = 0; 345 346else if (nmatch > 0) 347 { 348 if (nmatch <= POSIX_MALLOC_THRESHOLD) 349 { 350 ovector = &(small_ovector[0]); 351 } 352 else 353 { 354 if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE; 355 ovector = (int *)malloc(sizeof(int) * nmatch * 3); 356 if (ovector == NULL) return REG_ESPACE; 357 allocated_ovector = TRUE; 358 } 359 } 360 361/* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings. 362The man page from OS X says "REG_STARTEND affects only the location of the 363string, not how it is matched". That is why the "so" value is used to bump the 364start location rather than being passed as a PCRE "starting offset". */ 365 366if ((eflags & REG_STARTEND) != 0) 367 { 368 if (pmatch == NULL) return REG_INVARG; 369 so = pmatch[0].rm_so; 370 eo = pmatch[0].rm_eo; 371 } 372else 373 { 374 so = 0; 375 eo = (int)strlen(string); 376 } 377 378rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so), 379 0, options, ovector, (int)(nmatch * 3)); 380 381if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */ 382 383/* Successful match */ 384 385if (rc >= 0) 386 { 387 size_t i; 388 if (!nosub) 389 { 390 for (i = 0; i < (size_t)rc; i++) 391 { 392 pmatch[i].rm_so = ovector[i*2]; 393 pmatch[i].rm_eo = ovector[i*2+1]; 394 } 395 if (allocated_ovector) free(ovector); 396 for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1; 397 } 398 return 0; 399 } 400 401/* Unsuccessful match */ 402 403if (allocated_ovector) free(ovector); 404switch(rc) 405 { 406/* ========================================================================== */ 407 /* These cases are never obeyed. This is a fudge that causes a compile-time 408 error if the vector eint, which is indexed by compile-time error number, is 409 not the correct length. It seems to be the only way to do such a check at 410 compile time, as the sizeof() operator does not work in the C preprocessor. 411 As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */ 412 413 case 0: 414 case (sizeof(eint)/sizeof(int) == ERRCOUNT): 415 return REG_ASSERT; 416/* ========================================================================== */ 417 418 case PCRE_ERROR_NOMATCH: return REG_NOMATCH; 419 case PCRE_ERROR_NULL: return REG_INVARG; 420 case PCRE_ERROR_BADOPTION: return REG_INVARG; 421 case PCRE_ERROR_BADMAGIC: return REG_INVARG; 422 case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT; 423 case PCRE_ERROR_NOMEMORY: return REG_ESPACE; 424 case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE; 425 case PCRE_ERROR_BADUTF8: return REG_INVARG; 426 case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG; 427 case PCRE_ERROR_BADMODE: return REG_INVARG; 428 default: return REG_ASSERT; 429 } 430} 431 432/* End of pcreposix.c */ 433