+++ /dev/null
-/*************************************************
-* Perl-Compatible Regular Expressions *
-*************************************************/
-
-/*
-This is a library of functions to support regular expressions whose syntax
-and semantics are as close as possible to those of the Perl 5 language. See
-the file Tech.Notes for some information on the internals.
-
-This module is a wrapper that provides a POSIX API to the underlying PCRE
-functions.
-
-Written by: Philip Hazel <ph10@cam.ac.uk>
-
- Copyright (c) 1997-2000 University of Cambridge
-
------------------------------------------------------------------------------
-Permission is granted to anyone to use this software for any purpose on any
-computer system, and to redistribute it freely, subject to the following
-restrictions:
-
-1. This software is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-
-2. The origin of this software must not be misrepresented, either by
- explicit claim or by omission.
-
-3. Altered versions must be plainly marked as such, and must not be
- misrepresented as being the original software.
-
-4. If PCRE is embedded in any software that is released under the GNU
- General Purpose Licence (GPL), then the terms of that licence shall
- supersede any condition above with which it is incompatible.
------------------------------------------------------------------------------
-*/
-
-#include "internal.h"
-#include "pcreposix.h"
-#include "stdlib.h"
-
-
-
-/* Corresponding tables of PCRE error messages and POSIX error codes. */
-
-static const char *estring[] = {
- ERR1, ERR2, ERR3, ERR4, ERR5, ERR6, ERR7, ERR8, ERR9, ERR10,
- ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,
- ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,
- ERR31 };
-
-static int eint[] = {
- REG_EESCAPE, /* "\\ at end of pattern" */
- REG_EESCAPE, /* "\\c at end of pattern" */
- REG_EESCAPE, /* "unrecognized character follows \\" */
- REG_BADBR, /* "numbers out of order in {} quantifier" */
- REG_BADBR, /* "number too big in {} quantifier" */
- REG_EBRACK, /* "missing terminating ] for character class" */
- REG_ECTYPE, /* "invalid escape sequence in character class" */
- REG_ERANGE, /* "range out of order in character class" */
- REG_BADRPT, /* "nothing to repeat" */
- REG_BADRPT, /* "operand of unlimited repeat could match the empty string" */
- REG_ASSERT, /* "internal error: unexpected repeat" */
- REG_BADPAT, /* "unrecognized character after (?" */
- REG_ESIZE, /* "too many capturing parenthesized sub-patterns" */
- REG_EPAREN, /* "missing )" */
- REG_ESUBREG, /* "back reference to non-existent subpattern" */
- REG_INVARG, /* "erroffset passed as NULL" */
- REG_INVARG, /* "unknown option bit(s) set" */
- REG_EPAREN, /* "missing ) after comment" */
- REG_ESIZE, /* "too many sets of parentheses" */
- REG_ESIZE, /* "regular expression too large" */
- REG_ESPACE, /* "failed to get memory" */
- REG_EPAREN, /* "unmatched brackets" */
- REG_ASSERT, /* "internal error: code overflow" */
- REG_BADPAT, /* "unrecognized character after (?<" */
- REG_BADPAT, /* "lookbehind assertion is not fixed length" */
- REG_BADPAT, /* "malformed number after (?(" */
- REG_BADPAT, /* "conditional group containe more than two branches" */
- REG_BADPAT, /* "assertion expected after (?(" */
- REG_BADPAT, /* "(?p must be followed by )" */
- REG_ECTYPE, /* "unknown POSIX class name" */
- REG_BADPAT, /* "POSIX collating elements are not supported" */
- REG_INVARG, /* "this version of PCRE is not compiled with PCRE_UTF8 support" */
- REG_BADPAT, /* "characters with values > 255 are not yet supported in classes" */
- REG_BADPAT, /* "character value in \x{...} sequence is too large" */
- REG_BADPAT /* "invalid condition (?(0)" */
-};
-
-/* Table of texts corresponding to POSIX error codes */
-
-static const char *pstring[] = {
- "", /* Dummy for value 0 */
- "internal error", /* REG_ASSERT */
- "invalid repeat counts in {}", /* BADBR */
- "pattern error", /* BADPAT */
- "? * + invalid", /* BADRPT */
- "unbalanced {}", /* EBRACE */
- "unbalanced []", /* EBRACK */
- "collation error - not relevant", /* ECOLLATE */
- "bad class", /* ECTYPE */
- "bad escape sequence", /* EESCAPE */
- "empty expression", /* EMPTY */
- "unbalanced ()", /* EPAREN */
- "bad range inside []", /* ERANGE */
- "expression too big", /* ESIZE */
- "failed to get memory", /* ESPACE */
- "bad back reference", /* ESUBREG */
- "bad argument", /* INVARG */
- "match failed" /* NOMATCH */
-};
-
-
-
-
-/*************************************************
-* Translate PCRE text code to int *
-*************************************************/
-
-/* PCRE compile-time errors are given as strings defined as macros. We can just
-look them up in a table to turn them into POSIX-style error codes. */
-
-static int
-pcre_posix_error_code(const char *s)
-{
-size_t i;
-for (i = 0; i < sizeof(estring)/sizeof(char *); i++)
- if (strcmp(s, estring[i]) == 0) return eint[i];
-return REG_ASSERT;
-}
-
-
-
-/*************************************************
-* Translate error code to string *
-*************************************************/
-
-size_t
-regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
-{
-const char *message, *addmessage;
-size_t length, addlength;
-
-message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
- "unknown error code" : pstring[errcode];
-length = strlen(message) + 1;
-
-addmessage = " at offset ";
-addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
- strlen(addmessage) + 6 : 0;
-
-if (errbuf_size > 0)
- {
- if (addlength > 0 && errbuf_size >= length + addlength)
- sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
- else
- {
- strncpy(errbuf, message, errbuf_size - 1);
- errbuf[errbuf_size-1] = 0;
- }
- }
-
-return length + addlength;
-}
-
-
-
-
-/*************************************************
-* Free store held by a regex *
-*************************************************/
-
-void
-regfree(regex_t *preg)
-{
-(pcre_free)(preg->re_pcre);
-}
-
-
-
-
-/*************************************************
-* Compile a regular expression *
-*************************************************/
-
-/*
-Arguments:
- preg points to a structure for recording the compiled expression
- pattern the pattern to compile
- cflags compilation flags
-
-Returns: 0 on success
- various non-zero codes on failure
-*/
-
-int
-regcomp(regex_t *preg, const char *pattern, int cflags)
-{
-const char *errorptr;
-int erroffset;
-int options = 0;
-
-if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
-if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
-
-preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);
-preg->re_erroffset = erroffset;
-
-if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);
-
-preg->re_nsub = pcre_info(preg->re_pcre, NULL, NULL);
-return 0;
-}
-
-
-
-
-/*************************************************
-* Match a regular expression *
-*************************************************/
-
-/* Unfortunately, PCRE requires 3 ints of working space for each captured
-substring, so we have to get and release working store instead of just using
-the POSIX structures as was done in earlier releases when PCRE needed only 2
-ints. */
-
-int
-regexec(regex_t *preg, const char *string, size_t nmatch,
- regmatch_t pmatch[], int eflags)
-{
-int rc;
-int options = 0;
-int *ovector = NULL;
-
-if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
-if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
-
-preg->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
-
-if (nmatch > 0)
- {
- ovector = (int *)malloc(sizeof(int) * nmatch * 3);
- if (ovector == NULL) return REG_ESPACE;
- }
-
-rc = pcre_exec(preg->re_pcre, NULL, string, (int)strlen(string), 0, options,
- ovector, nmatch * 3);
-
-if (rc == 0) rc = nmatch; /* All captured slots were filled in */
-
-if (rc >= 0)
- {
- size_t i;
- for (i = 0; i < (size_t)rc; i++)
- {
- pmatch[i].rm_so = ovector[i*2];
- pmatch[i].rm_eo = ovector[i*2+1];
- }
- if (ovector != NULL) free(ovector);
- for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
- return 0;
- }
-
-else
- {
- if (ovector != NULL) free(ovector);
- switch(rc)
- {
- case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
- case PCRE_ERROR_NULL: return REG_INVARG;
- case PCRE_ERROR_BADOPTION: return REG_INVARG;
- case PCRE_ERROR_BADMAGIC: return REG_INVARG;
- case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
- case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
- default: return REG_ASSERT;
- }
- }
-}
-
-/* End of pcreposix.c */
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