441 lines
15 KiB
C
441 lines
15 KiB
C
/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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/* PCRE is a library of functions to support regular expressions whose syntax
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and semantics are as close as possible to those of the Perl 5 language.
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Written by Philip Hazel
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Original API code Copyright (c) 1997-2012 University of Cambridge
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New API code Copyright (c) 2016-2021 University of Cambridge
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-----------------------------------------------------------------------------
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the University of Cambridge nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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-----------------------------------------------------------------------------
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*/
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/* This module is a wrapper that provides a POSIX API to the underlying PCRE2
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functions. The operative functions are called pcre2_regcomp(), etc., with
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wrappers that use the plain POSIX names. In addition, pcre2posix.h defines the
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POSIX names as macros for the pcre2_xxx functions, so any program that includes
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it and uses the POSIX names will call the base functions directly. This makes
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it easier for an application to be sure it gets the PCRE2 versions in the
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presence of other POSIX regex libraries. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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/* Ensure that the PCRE2POSIX_EXP_xxx macros are set appropriately for
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compiling these functions. This must come before including pcre2posix.h, where
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they are set for an application (using these functions) if they have not
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previously been set. */
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#if defined(_WIN32) && !defined(PCRE2_STATIC)
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# define PCRE2POSIX_EXP_DECL extern __declspec(dllexport)
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# define PCRE2POSIX_EXP_DEFN __declspec(dllexport)
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#endif
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/* Older versions of MSVC lack snprintf(). This define allows for
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warning/error-free compilation and testing with MSVC compilers back to at least
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MSVC 10/2010. Except for VC6 (which is missing some fundamentals and fails). */
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#if defined(_MSC_VER) && (_MSC_VER < 1900)
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#define snprintf _snprintf
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#endif
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/* Compile-time error numbers start at this value. It should probably never be
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changed. This #define is a copy of the one in pcre2_internal.h. */
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#define COMPILE_ERROR_BASE 100
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/* Standard C headers */
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#include <ctype.h>
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#include <limits.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* PCRE2 headers */
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#include "pcre2.h"
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#include "pcre2posix.h"
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/* When compiling with the MSVC compiler, it is sometimes necessary to include
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a "calling convention" before exported function names. (This is secondhand
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information; I know nothing about MSVC myself). For example, something like
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void __cdecl function(....)
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might be needed. In order to make this easy, all the exported functions have
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PCRE2_CALL_CONVENTION just before their names. It is rarely needed; if not
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set, we ensure here that it has no effect. */
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#ifndef PCRE2_CALL_CONVENTION
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#define PCRE2_CALL_CONVENTION
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#endif
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/* Table to translate PCRE2 compile time error codes into POSIX error codes.
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Only a few PCRE2 errors with a value greater than 23 turn into special POSIX
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codes: most go to REG_BADPAT. The second table lists, in pairs, those that
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don't. */
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static const int eint1[] = {
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0, /* No error */
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REG_EESCAPE, /* \ at end of pattern */
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REG_EESCAPE, /* \c at end of pattern */
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REG_EESCAPE, /* unrecognized character follows \ */
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REG_BADBR, /* numbers out of order in {} quantifier */
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/* 5 */
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REG_BADBR, /* number too big in {} quantifier */
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REG_EBRACK, /* missing terminating ] for character class */
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REG_ECTYPE, /* invalid escape sequence in character class */
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REG_ERANGE, /* range out of order in character class */
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REG_BADRPT, /* nothing to repeat */
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/* 10 */
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REG_ASSERT, /* internal error: unexpected repeat */
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REG_BADPAT, /* unrecognized character after (? or (?- */
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REG_BADPAT, /* POSIX named classes are supported only within a class */
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REG_BADPAT, /* POSIX collating elements are not supported */
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REG_EPAREN, /* missing ) */
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/* 15 */
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REG_ESUBREG, /* reference to non-existent subpattern */
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REG_INVARG, /* pattern passed as NULL */
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REG_INVARG, /* unknown compile-time option bit(s) */
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REG_EPAREN, /* missing ) after (?# comment */
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REG_ESIZE, /* parentheses nested too deeply */
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/* 20 */
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REG_ESIZE, /* regular expression too large */
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REG_ESPACE, /* failed to get memory */
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REG_EPAREN, /* unmatched closing parenthesis */
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REG_ASSERT /* internal error: code overflow */
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};
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static const int eint2[] = {
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30, REG_ECTYPE, /* unknown POSIX class name */
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32, REG_INVARG, /* this version of PCRE2 does not have Unicode support */
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37, REG_EESCAPE, /* PCRE2 does not support \L, \l, \N{name}, \U, or \u */
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56, REG_INVARG, /* internal error: unknown newline setting */
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92, REG_INVARG, /* invalid option bits with PCRE2_LITERAL */
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99, REG_EESCAPE /* \K in lookaround */
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};
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/* Table of texts corresponding to POSIX error codes */
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static const char *const pstring[] = {
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"", /* Dummy for value 0 */
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"internal error", /* REG_ASSERT */
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"invalid repeat counts in {}", /* BADBR */
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"pattern error", /* BADPAT */
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"? * + invalid", /* BADRPT */
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"unbalanced {}", /* EBRACE */
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"unbalanced []", /* EBRACK */
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"collation error - not relevant", /* ECOLLATE */
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"bad class", /* ECTYPE */
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"bad escape sequence", /* EESCAPE */
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"empty expression", /* EMPTY */
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"unbalanced ()", /* EPAREN */
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"bad range inside []", /* ERANGE */
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"expression too big", /* ESIZE */
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"failed to get memory", /* ESPACE */
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"bad back reference", /* ESUBREG */
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"bad argument", /* INVARG */
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"match failed" /* NOMATCH */
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};
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#if 0 /* REMOVE THIS CODE */
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The code below was created for 10.33 (see ChangeLog 10.33 #4) when the
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POSIX functions were given pcre2_... names instead of the traditional POSIX
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names. However, it has proved to be more troublesome than useful. There have
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been at least two cases where a program links with two others, one of which
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uses the POSIX library and the other uses the PCRE2 POSIX functions, thus
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causing two instances of the POSIX runctions to exist, leading to trouble. For
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10.37 this code is commented out. In due course it can be removed if there are
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no issues. The only small worry is the comment below about languages that do
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not include pcre2posix.h. If there are any such cases, they will have to use
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the PCRE2 names.
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/*************************************************
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* Wrappers with traditional POSIX names *
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*************************************************/
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/* Keep defining them to preseve the ABI for applications linked to the pcre2
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POSIX library before these names were changed into macros in pcre2posix.h.
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This also ensures that the POSIX names are callable from languages that do not
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include pcre2posix.h. It is vital to #undef the macro definitions from
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pcre2posix.h! */
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#undef regerror
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PCRE2POSIX_EXP_DECL size_t regerror(int, const regex_t *, char *, size_t);
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PCRE2POSIX_EXP_DEFN size_t PCRE2_CALL_CONVENTION
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regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
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{
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return pcre2_regerror(errcode, preg, errbuf, errbuf_size);
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}
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#undef regfree
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PCRE2POSIX_EXP_DECL void regfree(regex_t *);
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PCRE2POSIX_EXP_DEFN void PCRE2_CALL_CONVENTION
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regfree(regex_t *preg)
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{
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pcre2_regfree(preg);
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}
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#undef regcomp
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PCRE2POSIX_EXP_DECL int regcomp(regex_t *, const char *, int);
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PCRE2POSIX_EXP_DEFN int PCRE2_CALL_CONVENTION
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regcomp(regex_t *preg, const char *pattern, int cflags)
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{
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return pcre2_regcomp(preg, pattern, cflags);
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}
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#undef regexec
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PCRE2POSIX_EXP_DECL int regexec(const regex_t *, const char *, size_t,
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regmatch_t *, int);
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PCRE2POSIX_EXP_DEFN int PCRE2_CALL_CONVENTION
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regexec(const regex_t *preg, const char *string, size_t nmatch,
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regmatch_t pmatch[], int eflags)
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{
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return pcre2_regexec(preg, string, nmatch, pmatch, eflags);
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}
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#endif
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/*************************************************
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* Translate error code to string *
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*************************************************/
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PCRE2POSIX_EXP_DEFN size_t PCRE2_CALL_CONVENTION
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pcre2_regerror(int errcode, const regex_t *preg, char *errbuf,
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size_t errbuf_size)
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{
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int used;
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const char *message;
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message = (errcode <= 0 || errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
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"unknown error code" : pstring[errcode];
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if (preg != NULL && (int)preg->re_erroffset != -1)
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{
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used = snprintf(errbuf, errbuf_size, "%s at offset %-6d", message,
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(int)preg->re_erroffset);
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}
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else
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{
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used = snprintf(errbuf, errbuf_size, "%s", message);
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}
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return used + 1;
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}
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/*************************************************
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* Free store held by a regex *
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*************************************************/
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PCRE2POSIX_EXP_DEFN void PCRE2_CALL_CONVENTION
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pcre2_regfree(regex_t *preg)
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{
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pcre2_match_data_free(preg->re_match_data);
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pcre2_code_free(preg->re_pcre2_code);
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}
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/*************************************************
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* Compile a regular expression *
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*************************************************/
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/*
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Arguments:
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preg points to a structure for recording the compiled expression
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pattern the pattern to compile
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cflags compilation flags
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Returns: 0 on success
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various non-zero codes on failure
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*/
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PCRE2POSIX_EXP_DEFN int PCRE2_CALL_CONVENTION
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pcre2_regcomp(regex_t *preg, const char *pattern, int cflags)
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{
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PCRE2_SIZE erroffset;
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PCRE2_SIZE patlen;
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int errorcode;
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int options = 0;
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int re_nsub = 0;
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patlen = ((cflags & REG_PEND) != 0)? (PCRE2_SIZE)(preg->re_endp - pattern) :
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PCRE2_ZERO_TERMINATED;
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if ((cflags & REG_ICASE) != 0) options |= PCRE2_CASELESS;
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if ((cflags & REG_NEWLINE) != 0) options |= PCRE2_MULTILINE;
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if ((cflags & REG_DOTALL) != 0) options |= PCRE2_DOTALL;
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if ((cflags & REG_NOSPEC) != 0) options |= PCRE2_LITERAL;
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if ((cflags & REG_UTF) != 0) options |= PCRE2_UTF;
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if ((cflags & REG_UCP) != 0) options |= PCRE2_UCP;
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if ((cflags & REG_UNGREEDY) != 0) options |= PCRE2_UNGREEDY;
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preg->re_cflags = cflags;
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preg->re_pcre2_code = pcre2_compile((PCRE2_SPTR)pattern, patlen, options,
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&errorcode, &erroffset, NULL);
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preg->re_erroffset = erroffset;
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if (preg->re_pcre2_code == NULL)
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{
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unsigned int i;
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/* A negative value is a UTF error; otherwise all error codes are greater
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than COMPILE_ERROR_BASE, but check, just in case. */
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if (errorcode < COMPILE_ERROR_BASE) return REG_BADPAT;
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errorcode -= COMPILE_ERROR_BASE;
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if (errorcode < (int)(sizeof(eint1)/sizeof(const int)))
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return eint1[errorcode];
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for (i = 0; i < sizeof(eint2)/sizeof(const int); i += 2)
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if (errorcode == eint2[i]) return eint2[i+1];
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return REG_BADPAT;
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}
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(void)pcre2_pattern_info((const pcre2_code *)preg->re_pcre2_code,
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PCRE2_INFO_CAPTURECOUNT, &re_nsub);
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preg->re_nsub = (size_t)re_nsub;
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preg->re_match_data = pcre2_match_data_create(re_nsub + 1, NULL);
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preg->re_erroffset = (size_t)(-1); /* No meaning after successful compile */
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if (preg->re_match_data == NULL)
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{
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pcre2_code_free(preg->re_pcre2_code);
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return REG_ESPACE;
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}
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return 0;
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}
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/*************************************************
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* Match a regular expression *
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*************************************************/
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/* A suitable match_data block, large enough to hold all possible captures, was
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obtained when the pattern was compiled, to save having to allocate and free it
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for each match. If REG_NOSUB was specified at compile time, the nmatch and
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pmatch arguments are ignored, and the only result is yes/no/error. */
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PCRE2POSIX_EXP_DEFN int PCRE2_CALL_CONVENTION
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pcre2_regexec(const regex_t *preg, const char *string, size_t nmatch,
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regmatch_t pmatch[], int eflags)
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{
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int rc, so, eo;
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int options = 0;
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pcre2_match_data *md = (pcre2_match_data *)preg->re_match_data;
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if (string == NULL) return REG_INVARG;
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if ((eflags & REG_NOTBOL) != 0) options |= PCRE2_NOTBOL;
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if ((eflags & REG_NOTEOL) != 0) options |= PCRE2_NOTEOL;
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if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE2_NOTEMPTY;
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/* When REG_NOSUB was specified, or if no vector has been passed in which to
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put captured strings, ensure that nmatch is zero. This will stop any attempt to
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write to pmatch. */
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if ((preg->re_cflags & REG_NOSUB) != 0 || pmatch == NULL) nmatch = 0;
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/* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
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The man page from OS X says "REG_STARTEND affects only the location of the
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string, not how it is matched". That is why the "so" value is used to bump the
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start location rather than being passed as a PCRE2 "starting offset". */
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if ((eflags & REG_STARTEND) != 0)
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{
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if (pmatch == NULL) return REG_INVARG;
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so = pmatch[0].rm_so;
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eo = pmatch[0].rm_eo;
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}
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else
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{
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so = 0;
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eo = (int)strlen(string);
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}
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rc = pcre2_match((const pcre2_code *)preg->re_pcre2_code,
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(PCRE2_SPTR)string + so, (eo - so), 0, options, md, NULL);
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/* Successful match */
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if (rc >= 0)
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{
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size_t i;
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PCRE2_SIZE *ovector = pcre2_get_ovector_pointer(md);
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if ((size_t)rc > nmatch) rc = (int)nmatch;
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for (i = 0; i < (size_t)rc; i++)
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{
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pmatch[i].rm_so = (ovector[i*2] == PCRE2_UNSET)? -1 :
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(int)(ovector[i*2] + so);
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pmatch[i].rm_eo = (ovector[i*2+1] == PCRE2_UNSET)? -1 :
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(int)(ovector[i*2+1] + so);
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}
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for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
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return 0;
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}
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/* Unsuccessful match */
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if (rc <= PCRE2_ERROR_UTF8_ERR1 && rc >= PCRE2_ERROR_UTF8_ERR21)
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return REG_INVARG;
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switch(rc)
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{
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default: return REG_ASSERT;
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case PCRE2_ERROR_BADMODE: return REG_INVARG;
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case PCRE2_ERROR_BADMAGIC: return REG_INVARG;
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case PCRE2_ERROR_BADOPTION: return REG_INVARG;
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case PCRE2_ERROR_BADUTFOFFSET: return REG_INVARG;
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case PCRE2_ERROR_MATCHLIMIT: return REG_ESPACE;
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case PCRE2_ERROR_NOMATCH: return REG_NOMATCH;
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case PCRE2_ERROR_NOMEMORY: return REG_ESPACE;
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case PCRE2_ERROR_NULL: return REG_INVARG;
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}
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}
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/* End of pcre2posix.c */
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