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    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) 1997-2018 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   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 
  182 static 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 
  210 PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
  211 regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
  212 {
  213 const char *message, *addmessage;
  214 size_t length, addlength;
  215 
  216 message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
  217   "unknown error code" : pstring[errcode];
  218 length = strlen(message) + 1;
  219 
  220 addmessage = " at offset ";
  221 addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
  222   strlen(addmessage) + 6 : 0;
  223 
  224 if (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 
  235 return length + addlength;
  236 }
  237 
  238 
  239 
  240 
  241 /*************************************************
  242 *           Free store held by a regex           *
  243 *************************************************/
  244 
  245 PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
  246 regfree(regex_t *preg)
  247 {
  248 (PUBL(free))(preg->re_pcre);
  249 }
  250 
  251 
  252 
  253 
  254 /*************************************************
  255 *            Compile a regular expression        *
  256 *************************************************/
  257 
  258 /*
  259 Arguments:
  260   preg        points to a structure for recording the compiled expression
  261   pattern     the pattern to compile
  262   cflags      compilation flags
  263 
  264 Returns:      0 on success
  265               various non-zero codes on failure
  266 */
  267 
  268 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
  269 regcomp(regex_t *preg, const char *pattern, int cflags)
  270 {
  271 const char *errorptr;
  272 int erroffset;
  273 int errorcode;
  274 int options = 0;
  275 int re_nsub = 0;
  276 
  277 if ((cflags & REG_ICASE) != 0)    options |= PCRE_CASELESS;
  278 if ((cflags & REG_NEWLINE) != 0)  options |= PCRE_MULTILINE;
  279 if ((cflags & REG_DOTALL) != 0)   options |= PCRE_DOTALL;
  280 if ((cflags & REG_NOSUB) != 0)    options |= PCRE_NO_AUTO_CAPTURE;
  281 if ((cflags & REG_UTF8) != 0)     options |= PCRE_UTF8;
  282 if ((cflags & REG_UCP) != 0)      options |= PCRE_UCP;
  283 if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
  284 
  285 preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
  286   &erroffset, NULL);
  287 preg->re_erroffset = erroffset;
  288 
  289 /* Safety: if the error code is too big for the translation vector (which
  290 should not happen, but we all make mistakes), return REG_BADPAT. */
  291 
  292 if (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);
  300 preg->re_nsub = (size_t)re_nsub;
  301 return 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
  312 substring, so we have to get and release working store instead of just using
  313 the POSIX structures as was done in earlier releases when PCRE needed only 2
  314 ints. However, if the number of possible capturing brackets is small, use a
  315 block of store on the stack, to reduce the use of malloc/free. The threshold is
  316 in a macro that can be changed at configure time.
  317 
  318 If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
  319 be set. When this is the case, the nmatch and pmatch arguments are ignored, and
  320 the only result is yes/no/error. */
  321 
  322 PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
  323 regexec(const regex_t *preg, const char *string, size_t nmatch,
  324   regmatch_t pmatch[], int eflags)
  325 {
  326 int rc, so, eo;
  327 int options = 0;
  328 int *ovector = NULL;
  329 int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
  330 BOOL allocated_ovector = FALSE;
  331 BOOL nosub =
  332   (REAL_PCRE_OPTIONS((const pcre *)preg->re_pcre) & PCRE_NO_AUTO_CAPTURE) != 0;
  333 
  334 if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
  335 if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
  336 if ((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
  341 to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
  342 the return data is large enough. */
  343 
  344 if (nosub || pmatch == NULL) nmatch = 0;
  345 
  346 else 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.
  362 The man page from OS X says "REG_STARTEND affects only the location of the
  363 string, not how it is matched". That is why the "so" value is used to bump the
  364 start location rather than being passed as a PCRE "starting offset". */
  365 
  366 if ((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   }
  372 else
  373   {
  374   so = 0;
  375   eo = (int)strlen(string);
  376   }
  377 
  378 rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
  379   0, options, ovector, (int)(nmatch * 3));
  380 
  381 if (rc == 0) rc = (int)nmatch;    /* All captured slots were filled in */
  382 
  383 /* Successful match */
  384 
  385 if (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] < 0)? -1 : ovector[i*2] + so;
  393       pmatch[i].rm_eo = (ovector[i*2+1] < 0)? -1: ovector[i*2+1] + so;
  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 
  403 if (allocated_ovector) free(ovector);
  404 switch(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 */