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433 lines
16 KiB
C
433 lines
16 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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Copyright (c) 1997-2018 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 PCRE
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functions. */
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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 PCREPOSIX_EXP_xxx macros are set appropriately for
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compiling these functions. This must come before including pcreposix.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(PCRE_STATIC)
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# define PCREPOSIX_EXP_DECL extern __declspec(dllexport)
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# define PCREPOSIX_EXP_DEFN __declspec(dllexport)
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#endif
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/* We include pcre.h before pcre_internal.h so that the PCRE library functions
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are declared as "import" for Windows by defining PCRE_EXP_DECL as "import".
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This is needed even though pcre_internal.h itself includes pcre.h, because it
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does so after it has set PCRE_EXP_DECL to "export" if it is not already set. */
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#include "pcre.h"
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#include "pcre_internal.h"
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#include "pcreposix.h"
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/* Table to translate PCRE compile time error codes into POSIX error codes. */
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static const int eint[] = {
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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_BADRPT, /* operand of unlimited repeat could match the empty string */
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REG_ASSERT, /* internal error: unexpected repeat */
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REG_BADPAT, /* unrecognized character after (? */
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REG_BADPAT, /* POSIX named classes are supported only within a class */
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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, /* erroffset passed as NULL */
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REG_INVARG, /* unknown option bit(s) set */
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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 parentheses */
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REG_ASSERT, /* internal error: code overflow */
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REG_BADPAT, /* unrecognized character after (?< */
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/* 25 */
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REG_BADPAT, /* lookbehind assertion is not fixed length */
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REG_BADPAT, /* malformed number or name after (?( */
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REG_BADPAT, /* conditional group contains more than two branches */
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REG_BADPAT, /* assertion expected after (?( */
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REG_BADPAT, /* (?R or (?[+-]digits must be followed by ) */
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/* 30 */
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REG_ECTYPE, /* unknown POSIX class name */
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REG_BADPAT, /* POSIX collating elements are not supported */
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REG_INVARG, /* this version of PCRE is not compiled with PCRE_UTF8 support */
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REG_BADPAT, /* spare error */
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REG_BADPAT, /* character value in \x{} or \o{} is too large */
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/* 35 */
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REG_BADPAT, /* invalid condition (?(0) */
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REG_BADPAT, /* \C not allowed in lookbehind assertion */
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REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
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REG_BADPAT, /* number after (?C is > 255 */
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REG_BADPAT, /* closing ) for (?C expected */
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/* 40 */
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REG_BADPAT, /* recursive call could loop indefinitely */
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REG_BADPAT, /* unrecognized character after (?P */
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REG_BADPAT, /* syntax error in subpattern name (missing terminator) */
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REG_BADPAT, /* two named subpatterns have the same name */
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REG_BADPAT, /* invalid UTF-8 string */
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/* 45 */
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REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
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REG_BADPAT, /* malformed \P or \p sequence */
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REG_BADPAT, /* unknown property name after \P or \p */
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REG_BADPAT, /* subpattern name is too long (maximum 32 characters) */
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REG_BADPAT, /* too many named subpatterns (maximum 10,000) */
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/* 50 */
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REG_BADPAT, /* repeated subpattern is too long */
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REG_BADPAT, /* octal value is greater than \377 (not in UTF-8 mode) */
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REG_BADPAT, /* internal error: overran compiling workspace */
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REG_BADPAT, /* internal error: previously-checked referenced subpattern not found */
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REG_BADPAT, /* DEFINE group contains more than one branch */
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/* 55 */
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REG_BADPAT, /* repeating a DEFINE group is not allowed */
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REG_INVARG, /* inconsistent NEWLINE options */
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REG_BADPAT, /* \g is not followed followed by an (optionally braced) non-zero number */
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REG_BADPAT, /* a numbered reference must not be zero */
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REG_BADPAT, /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
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/* 60 */
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REG_BADPAT, /* (*VERB) not recognized */
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REG_BADPAT, /* number is too big */
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REG_BADPAT, /* subpattern name expected */
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REG_BADPAT, /* digit expected after (?+ */
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REG_BADPAT, /* ] is an invalid data character in JavaScript compatibility mode */
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/* 65 */
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REG_BADPAT, /* different names for subpatterns of the same number are not allowed */
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REG_BADPAT, /* (*MARK) must have an argument */
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REG_INVARG, /* this version of PCRE is not compiled with PCRE_UCP support */
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REG_BADPAT, /* \c must be followed by an ASCII character */
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REG_BADPAT, /* \k is not followed by a braced, angle-bracketed, or quoted name */
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/* 70 */
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REG_BADPAT, /* internal error: unknown opcode in find_fixedlength() */
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REG_BADPAT, /* \N is not supported in a class */
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REG_BADPAT, /* too many forward references */
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REG_BADPAT, /* disallowed UTF-8/16/32 code point (>= 0xd800 && <= 0xdfff) */
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REG_BADPAT, /* invalid UTF-16 string (should not occur) */
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/* 75 */
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REG_BADPAT, /* overlong MARK name */
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REG_BADPAT, /* character value in \u.... sequence is too large */
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REG_BADPAT, /* invalid UTF-32 string (should not occur) */
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REG_BADPAT, /* setting UTF is disabled by the application */
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REG_BADPAT, /* non-hex character in \\x{} (closing brace missing?) */
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/* 80 */
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REG_BADPAT, /* non-octal character in \o{} (closing brace missing?) */
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REG_BADPAT, /* missing opening brace after \o */
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REG_BADPAT, /* parentheses too deeply nested */
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REG_BADPAT, /* invalid range in character class */
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REG_BADPAT, /* group name must start with a non-digit */
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/* 85 */
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REG_BADPAT, /* parentheses too deeply nested (stack check) */
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REG_BADPAT, /* missing digits in \x{} or \o{} */
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REG_BADPAT /* pattern too complicated */
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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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/*************************************************
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* Translate error code to string *
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*************************************************/
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PCREPOSIX_EXP_DEFN size_t PCRE_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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const char *message, *addmessage;
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size_t length, addlength;
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message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
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"unknown error code" : pstring[errcode];
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length = strlen(message) + 1;
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addmessage = " at offset ";
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addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
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strlen(addmessage) + 6 : 0;
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if (errbuf_size > 0)
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{
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if (addlength > 0 && errbuf_size >= length + addlength)
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sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
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else
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{
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strncpy(errbuf, message, errbuf_size - 1);
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errbuf[errbuf_size-1] = 0;
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}
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}
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return length + addlength;
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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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PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
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regfree(regex_t *preg)
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{
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(PUBL(free))(preg->re_pcre);
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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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PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
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regcomp(regex_t *preg, const char *pattern, int cflags)
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{
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const char *errorptr;
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int erroffset;
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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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if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
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if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
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if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
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if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
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if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
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if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
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if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
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preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
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&erroffset, NULL);
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preg->re_erroffset = erroffset;
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/* Safety: if the error code is too big for the translation vector (which
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should not happen, but we all make mistakes), return REG_BADPAT. */
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if (preg->re_pcre == NULL)
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{
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return (errorcode < (int)(sizeof(eint)/sizeof(const int)))?
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eint[errorcode] : REG_BADPAT;
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}
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(void)pcre_fullinfo((const pcre *)preg->re_pcre, NULL, PCRE_INFO_CAPTURECOUNT,
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&re_nsub);
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preg->re_nsub = (size_t)re_nsub;
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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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/* Unfortunately, PCRE requires 3 ints of working space for each captured
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substring, so we have to get and release working store instead of just using
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the POSIX structures as was done in earlier releases when PCRE needed only 2
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ints. However, if the number of possible capturing brackets is small, use a
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block of store on the stack, to reduce the use of malloc/free. The threshold is
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in a macro that can be changed at configure time.
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If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
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be set. When this is the case, the nmatch and pmatch arguments are ignored, and
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the only result is yes/no/error. */
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PCREPOSIX_EXP_DEFN int PCRE_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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int rc, so, eo;
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int options = 0;
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int *ovector = NULL;
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int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
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BOOL allocated_ovector = FALSE;
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BOOL nosub =
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(REAL_PCRE_OPTIONS((const pcre *)preg->re_pcre) & PCRE_NO_AUTO_CAPTURE) != 0;
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if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
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if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
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if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
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((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
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/* When no string data is being returned, or no vector has been passed in which
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to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
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the return data is large enough. */
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if (nosub || pmatch == NULL) nmatch = 0;
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else if (nmatch > 0)
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{
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if (nmatch <= POSIX_MALLOC_THRESHOLD)
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{
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ovector = &(small_ovector[0]);
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}
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else
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{
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if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
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ovector = (int *)malloc(sizeof(int) * nmatch * 3);
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if (ovector == NULL) return REG_ESPACE;
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allocated_ovector = TRUE;
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}
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}
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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 PCRE "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 = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
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0, options, ovector, (int)(nmatch * 3));
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if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */
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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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if (!nosub)
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{
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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] < 0)? -1 : ovector[i*2] + so;
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pmatch[i].rm_eo = (ovector[i*2+1] < 0)? -1: ovector[i*2+1] + so;
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}
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if (allocated_ovector) free(ovector);
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for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
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}
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return 0;
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}
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/* Unsuccessful match */
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if (allocated_ovector) free(ovector);
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switch(rc)
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{
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/* ========================================================================== */
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/* These cases are never obeyed. This is a fudge that causes a compile-time
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error if the vector eint, which is indexed by compile-time error number, is
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not the correct length. It seems to be the only way to do such a check at
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compile time, as the sizeof() operator does not work in the C preprocessor.
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As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
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case 0:
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case (sizeof(eint)/sizeof(int) == ERRCOUNT):
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return REG_ASSERT;
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/* ========================================================================== */
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case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
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case PCRE_ERROR_NULL: return REG_INVARG;
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case PCRE_ERROR_BADOPTION: return REG_INVARG;
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case PCRE_ERROR_BADMAGIC: return REG_INVARG;
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case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
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case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
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case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
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case PCRE_ERROR_BADUTF8: return REG_INVARG;
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case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
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case PCRE_ERROR_BADMODE: return REG_INVARG;
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default: return REG_ASSERT;
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}
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}
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/* End of pcreposix.c */
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