342 lines
13 KiB
C
342 lines
13 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "pcre2_internal.h"
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#define STRING(a) # a
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#define XSTRING(s) STRING(s)
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/* The texts of compile-time error messages. Compile-time error numbers start
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at COMPILE_ERROR_BASE (100).
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This used to be a table of strings, but in order to reduce the number of
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relocations needed when a shared library is loaded dynamically, it is now one
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long string. We cannot use a table of offsets, because the lengths of inserts
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such as XSTRING(MAX_NAME_SIZE) are not known. Instead,
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pcre2_get_error_message() counts through to the one it wants - this isn't a
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performance issue because these strings are used only when there is an error.
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Each substring ends with \0 to insert a null character. This includes the final
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substring, so that the whole string ends with \0\0, which can be detected when
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counting through. */
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static const unsigned char compile_error_texts[] =
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"no error\0"
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"\\ at end of pattern\0"
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"\\c at end of pattern\0"
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"unrecognized character follows \\\0"
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"numbers out of order in {} quantifier\0"
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/* 5 */
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"number too big in {} quantifier\0"
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"missing terminating ] for character class\0"
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"escape sequence is invalid in character class\0"
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"range out of order in character class\0"
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"quantifier does not follow a repeatable item\0"
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/* 10 */
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"internal error: unexpected repeat\0"
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"unrecognized character after (? or (?-\0"
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"POSIX named classes are supported only within a class\0"
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"POSIX collating elements are not supported\0"
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"missing closing parenthesis\0"
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/* 15 */
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"reference to non-existent subpattern\0"
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"pattern passed as NULL\0"
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"unrecognised compile-time option bit(s)\0"
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"missing ) after (?# comment\0"
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"parentheses are too deeply nested\0"
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/* 20 */
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"regular expression is too large\0"
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"failed to allocate heap memory\0"
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"unmatched closing parenthesis\0"
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"internal error: code overflow\0"
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"missing closing parenthesis for condition\0"
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/* 25 */
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"lookbehind assertion is not fixed length\0"
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"a relative value of zero is not allowed\0"
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"conditional subpattern contains more than two branches\0"
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"assertion expected after (?( or (?(?C)\0"
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"digit expected after (?+ or (?-\0"
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/* 30 */
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"unknown POSIX class name\0"
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"internal error in pcre2_study(): should not occur\0"
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"this version of PCRE2 does not have Unicode support\0"
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"parentheses are too deeply nested (stack check)\0"
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"character code point value in \\x{} or \\o{} is too large\0"
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/* 35 */
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"lookbehind is too complicated\0"
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"\\C is not allowed in a lookbehind assertion in UTF-" XSTRING(PCRE2_CODE_UNIT_WIDTH) " mode\0"
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"PCRE2 does not support \\F, \\L, \\l, \\N{name}, \\U, or \\u\0"
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"number after (?C is greater than 255\0"
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"closing parenthesis for (?C expected\0"
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/* 40 */
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"invalid escape sequence in (*VERB) name\0"
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"unrecognized character after (?P\0"
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"syntax error in subpattern name (missing terminator?)\0"
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"two named subpatterns have the same name (PCRE2_DUPNAMES not set)\0"
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"subpattern name must start with a non-digit\0"
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/* 45 */
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"this version of PCRE2 does not have support for \\P, \\p, or \\X\0"
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"malformed \\P or \\p sequence\0"
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"unknown property after \\P or \\p\0"
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"subpattern name is too long (maximum " XSTRING(MAX_NAME_SIZE) " code units)\0"
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"too many named subpatterns (maximum " XSTRING(MAX_NAME_COUNT) ")\0"
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/* 50 */
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"invalid range in character class\0"
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"octal value is greater than \\377 in 8-bit non-UTF-8 mode\0"
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"internal error: overran compiling workspace\0"
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"internal error: previously-checked referenced subpattern not found\0"
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"DEFINE subpattern contains more than one branch\0"
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/* 55 */
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"missing opening brace after \\o\0"
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"internal error: unknown newline setting\0"
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"\\g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number\0"
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"(?R (recursive pattern call) must be followed by a closing parenthesis\0"
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/* "an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT)\0" */
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"obsolete error (should not occur)\0" /* Was the above */
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/* 60 */
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"(*VERB) not recognized or malformed\0"
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"subpattern number is too big\0"
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"subpattern name expected\0"
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"internal error: parsed pattern overflow\0"
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"non-octal character in \\o{} (closing brace missing?)\0"
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/* 65 */
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"different names for subpatterns of the same number are not allowed\0"
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"(*MARK) must have an argument\0"
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"non-hex character in \\x{} (closing brace missing?)\0"
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#ifndef EBCDIC
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"\\c must be followed by a printable ASCII character\0"
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#else
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"\\c must be followed by a letter or one of [\\]^_?\0"
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#endif
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"\\k is not followed by a braced, angle-bracketed, or quoted name\0"
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/* 70 */
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"internal error: unknown meta code in check_lookbehinds()\0"
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"\\N is not supported in a class\0"
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"callout string is too long\0"
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"disallowed Unicode code point (>= 0xd800 && <= 0xdfff)\0"
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"using UTF is disabled by the application\0"
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/* 75 */
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"using UCP is disabled by the application\0"
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"name is too long in (*MARK), (*PRUNE), (*SKIP), or (*THEN)\0"
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"character code point value in \\u.... sequence is too large\0"
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"digits missing in \\x{} or \\o{} or \\N{U+}\0"
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"syntax error or number too big in (?(VERSION condition\0"
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/* 80 */
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"internal error: unknown opcode in auto_possessify()\0"
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"missing terminating delimiter for callout with string argument\0"
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"unrecognized string delimiter follows (?C\0"
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"using \\C is disabled by the application\0"
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"(?| and/or (?J: or (?x: parentheses are too deeply nested\0"
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/* 85 */
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"using \\C is disabled in this PCRE2 library\0"
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"regular expression is too complicated\0"
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"lookbehind assertion is too long\0"
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"pattern string is longer than the limit set by the application\0"
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"internal error: unknown code in parsed pattern\0"
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/* 90 */
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"internal error: bad code value in parsed_skip()\0"
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"PCRE2_EXTRA_ALLOW_SURROGATE_ESCAPES is not allowed in UTF-16 mode\0"
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"invalid option bits with PCRE2_LITERAL\0"
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"\\N{U+dddd} is supported only in Unicode (UTF) mode\0"
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"invalid hyphen in option setting\0"
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/* 95 */
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"(*alpha_assertion) not recognized\0"
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"script runs require Unicode support, which this version of PCRE2 does not have\0"
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"too many capturing groups (maximum 65535)\0"
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"atomic assertion expected after (?( or (?(?C)\0"
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"\\K is not allowed in lookarounds (but see PCRE2_EXTRA_ALLOW_LOOKAROUND_BSK)\0"
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;
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/* Match-time and UTF error texts are in the same format. */
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static const unsigned char match_error_texts[] =
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"no error\0"
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"no match\0"
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"partial match\0"
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"UTF-8 error: 1 byte missing at end\0"
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"UTF-8 error: 2 bytes missing at end\0"
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/* 5 */
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"UTF-8 error: 3 bytes missing at end\0"
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"UTF-8 error: 4 bytes missing at end\0"
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"UTF-8 error: 5 bytes missing at end\0"
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"UTF-8 error: byte 2 top bits not 0x80\0"
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"UTF-8 error: byte 3 top bits not 0x80\0"
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/* 10 */
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"UTF-8 error: byte 4 top bits not 0x80\0"
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"UTF-8 error: byte 5 top bits not 0x80\0"
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"UTF-8 error: byte 6 top bits not 0x80\0"
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"UTF-8 error: 5-byte character is not allowed (RFC 3629)\0"
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"UTF-8 error: 6-byte character is not allowed (RFC 3629)\0"
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/* 15 */
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"UTF-8 error: code points greater than 0x10ffff are not defined\0"
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"UTF-8 error: code points 0xd800-0xdfff are not defined\0"
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"UTF-8 error: overlong 2-byte sequence\0"
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"UTF-8 error: overlong 3-byte sequence\0"
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"UTF-8 error: overlong 4-byte sequence\0"
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/* 20 */
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"UTF-8 error: overlong 5-byte sequence\0"
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"UTF-8 error: overlong 6-byte sequence\0"
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"UTF-8 error: isolated byte with 0x80 bit set\0"
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"UTF-8 error: illegal byte (0xfe or 0xff)\0"
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"UTF-16 error: missing low surrogate at end\0"
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/* 25 */
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"UTF-16 error: invalid low surrogate\0"
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"UTF-16 error: isolated low surrogate\0"
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"UTF-32 error: code points 0xd800-0xdfff are not defined\0"
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"UTF-32 error: code points greater than 0x10ffff are not defined\0"
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"bad data value\0"
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/* 30 */
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"patterns do not all use the same character tables\0"
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"magic number missing\0"
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"pattern compiled in wrong mode: 8/16/32-bit error\0"
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"bad offset value\0"
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"bad option value\0"
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/* 35 */
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"invalid replacement string\0"
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"bad offset into UTF string\0"
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"callout error code\0" /* Never returned by PCRE2 itself */
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"invalid data in workspace for DFA restart\0"
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"too much recursion for DFA matching\0"
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/* 40 */
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"backreference condition or recursion test is not supported for DFA matching\0"
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"function is not supported for DFA matching\0"
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"pattern contains an item that is not supported for DFA matching\0"
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"workspace size exceeded in DFA matching\0"
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"internal error - pattern overwritten?\0"
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/* 45 */
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"bad JIT option\0"
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"JIT stack limit reached\0"
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"match limit exceeded\0"
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"no more memory\0"
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"unknown substring\0"
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/* 50 */
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"non-unique substring name\0"
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"NULL argument passed with non-zero length\0"
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"nested recursion at the same subject position\0"
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"matching depth limit exceeded\0"
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"requested value is not available\0"
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/* 55 */
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"requested value is not set\0"
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"offset limit set without PCRE2_USE_OFFSET_LIMIT\0"
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"bad escape sequence in replacement string\0"
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"expected closing curly bracket in replacement string\0"
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"bad substitution in replacement string\0"
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/* 60 */
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"match with end before start or start moved backwards is not supported\0"
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"too many replacements (more than INT_MAX)\0"
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"bad serialized data\0"
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"heap limit exceeded\0"
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"invalid syntax\0"
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/* 65 */
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"internal error - duplicate substitution match\0"
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"PCRE2_MATCH_INVALID_UTF is not supported for DFA matching\0"
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;
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/*************************************************
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* Return error message *
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*************************************************/
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/* This function copies an error message into a buffer whose units are of an
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appropriate width. Error numbers are positive for compile-time errors, and
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negative for match-time errors (except for UTF errors), but the numbers are all
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distinct.
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Arguments:
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enumber error number
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buffer where to put the message (zero terminated)
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size size of the buffer in code units
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Returns: length of message if all is well
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negative on error
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*/
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PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION
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pcre2_get_error_message(int enumber, PCRE2_UCHAR *buffer, PCRE2_SIZE size)
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{
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const unsigned char *message;
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PCRE2_SIZE i;
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int n;
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if (size == 0) return PCRE2_ERROR_NOMEMORY;
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if (enumber >= COMPILE_ERROR_BASE) /* Compile error */
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{
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message = compile_error_texts;
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n = enumber - COMPILE_ERROR_BASE;
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}
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else if (enumber < 0) /* Match or UTF error */
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{
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message = match_error_texts;
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n = -enumber;
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}
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else /* Invalid error number */
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{
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message = (unsigned char *)"\0"; /* Empty message list */
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n = 1;
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}
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for (; n > 0; n--)
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{
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while (*message++ != CHAR_NUL) {};
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if (*message == CHAR_NUL) return PCRE2_ERROR_BADDATA;
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}
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for (i = 0; *message != 0; i++)
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{
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if (i >= size - 1)
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{
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buffer[i] = 0; /* Terminate partial message */
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return PCRE2_ERROR_NOMEMORY;
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}
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buffer[i] = *message++;
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}
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buffer[i] = 0;
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return (int)i;
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}
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/* End of pcre2_error.c */
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