mirror of
https://github.com/alliedmodders/amxmodx.git
synced 2024-12-27 07:15:37 +03:00
420 lines
15 KiB
C
420 lines
15 KiB
C
/*************************************************
|
|
* Perl-Compatible Regular Expressions *
|
|
*************************************************/
|
|
|
|
/* PCRE is a library of functions to support regular expressions whose syntax
|
|
and semantics are as close as possible to those of the Perl 5 language.
|
|
|
|
Written by Philip Hazel
|
|
Copyright (c) 1997-2012 University of Cambridge
|
|
|
|
-----------------------------------------------------------------------------
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
* Neither the name of the University of Cambridge nor the names of its
|
|
contributors may be used to endorse or promote products derived from
|
|
this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
-----------------------------------------------------------------------------
|
|
*/
|
|
|
|
|
|
/* This module is a wrapper that provides a POSIX API to the underlying PCRE
|
|
functions. */
|
|
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
|
|
/* Ensure that the PCREPOSIX_EXP_xxx macros are set appropriately for
|
|
compiling these functions. This must come before including pcreposix.h, where
|
|
they are set for an application (using these functions) if they have not
|
|
previously been set. */
|
|
|
|
#if defined(_WIN32) && !defined(PCRE_STATIC)
|
|
# define PCREPOSIX_EXP_DECL extern __declspec(dllexport)
|
|
# define PCREPOSIX_EXP_DEFN __declspec(dllexport)
|
|
#endif
|
|
|
|
/* We include pcre.h before pcre_internal.h so that the PCRE library functions
|
|
are declared as "import" for Windows by defining PCRE_EXP_DECL as "import".
|
|
This is needed even though pcre_internal.h itself includes pcre.h, because it
|
|
does so after it has set PCRE_EXP_DECL to "export" if it is not already set. */
|
|
|
|
#include "pcre.h"
|
|
#include "pcre_internal.h"
|
|
#include "pcreposix.h"
|
|
|
|
|
|
/* Table to translate PCRE compile time error codes into POSIX error codes. */
|
|
|
|
static const int eint[] = {
|
|
0, /* no error */
|
|
REG_EESCAPE, /* \ at end of pattern */
|
|
REG_EESCAPE, /* \c at end of pattern */
|
|
REG_EESCAPE, /* unrecognized character follows \ */
|
|
REG_BADBR, /* numbers out of order in {} quantifier */
|
|
/* 5 */
|
|
REG_BADBR, /* number too big in {} quantifier */
|
|
REG_EBRACK, /* missing terminating ] for character class */
|
|
REG_ECTYPE, /* invalid escape sequence in character class */
|
|
REG_ERANGE, /* range out of order in character class */
|
|
REG_BADRPT, /* nothing to repeat */
|
|
/* 10 */
|
|
REG_BADRPT, /* operand of unlimited repeat could match the empty string */
|
|
REG_ASSERT, /* internal error: unexpected repeat */
|
|
REG_BADPAT, /* unrecognized character after (? */
|
|
REG_BADPAT, /* POSIX named classes are supported only within a class */
|
|
REG_EPAREN, /* missing ) */
|
|
/* 15 */
|
|
REG_ESUBREG, /* reference to non-existent subpattern */
|
|
REG_INVARG, /* erroffset passed as NULL */
|
|
REG_INVARG, /* unknown option bit(s) set */
|
|
REG_EPAREN, /* missing ) after comment */
|
|
REG_ESIZE, /* parentheses nested too deeply */
|
|
/* 20 */
|
|
REG_ESIZE, /* regular expression too large */
|
|
REG_ESPACE, /* failed to get memory */
|
|
REG_EPAREN, /* unmatched parentheses */
|
|
REG_ASSERT, /* internal error: code overflow */
|
|
REG_BADPAT, /* unrecognized character after (?< */
|
|
/* 25 */
|
|
REG_BADPAT, /* lookbehind assertion is not fixed length */
|
|
REG_BADPAT, /* malformed number or name after (?( */
|
|
REG_BADPAT, /* conditional group contains more than two branches */
|
|
REG_BADPAT, /* assertion expected after (?( */
|
|
REG_BADPAT, /* (?R or (?[+-]digits must be followed by ) */
|
|
/* 30 */
|
|
REG_ECTYPE, /* unknown POSIX class name */
|
|
REG_BADPAT, /* POSIX collating elements are not supported */
|
|
REG_INVARG, /* this version of PCRE is not compiled with PCRE_UTF8 support */
|
|
REG_BADPAT, /* spare error */
|
|
REG_BADPAT, /* character value in \x{...} sequence is too large */
|
|
/* 35 */
|
|
REG_BADPAT, /* invalid condition (?(0) */
|
|
REG_BADPAT, /* \C not allowed in lookbehind assertion */
|
|
REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
|
|
REG_BADPAT, /* number after (?C is > 255 */
|
|
REG_BADPAT, /* closing ) for (?C expected */
|
|
/* 40 */
|
|
REG_BADPAT, /* recursive call could loop indefinitely */
|
|
REG_BADPAT, /* unrecognized character after (?P */
|
|
REG_BADPAT, /* syntax error in subpattern name (missing terminator) */
|
|
REG_BADPAT, /* two named subpatterns have the same name */
|
|
REG_BADPAT, /* invalid UTF-8 string */
|
|
/* 45 */
|
|
REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
|
|
REG_BADPAT, /* malformed \P or \p sequence */
|
|
REG_BADPAT, /* unknown property name after \P or \p */
|
|
REG_BADPAT, /* subpattern name is too long (maximum 32 characters) */
|
|
REG_BADPAT, /* too many named subpatterns (maximum 10,000) */
|
|
/* 50 */
|
|
REG_BADPAT, /* repeated subpattern is too long */
|
|
REG_BADPAT, /* octal value is greater than \377 (not in UTF-8 mode) */
|
|
REG_BADPAT, /* internal error: overran compiling workspace */
|
|
REG_BADPAT, /* internal error: previously-checked referenced subpattern not found */
|
|
REG_BADPAT, /* DEFINE group contains more than one branch */
|
|
/* 55 */
|
|
REG_BADPAT, /* repeating a DEFINE group is not allowed */
|
|
REG_INVARG, /* inconsistent NEWLINE options */
|
|
REG_BADPAT, /* \g is not followed followed by an (optionally braced) non-zero number */
|
|
REG_BADPAT, /* a numbered reference must not be zero */
|
|
REG_BADPAT, /* an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT) */
|
|
/* 60 */
|
|
REG_BADPAT, /* (*VERB) not recognized */
|
|
REG_BADPAT, /* number is too big */
|
|
REG_BADPAT, /* subpattern name expected */
|
|
REG_BADPAT, /* digit expected after (?+ */
|
|
REG_BADPAT, /* ] is an invalid data character in JavaScript compatibility mode */
|
|
/* 65 */
|
|
REG_BADPAT, /* different names for subpatterns of the same number are not allowed */
|
|
REG_BADPAT, /* (*MARK) must have an argument */
|
|
REG_INVARG, /* this version of PCRE is not compiled with PCRE_UCP support */
|
|
REG_BADPAT, /* \c must be followed by an ASCII character */
|
|
REG_BADPAT, /* \k is not followed by a braced, angle-bracketed, or quoted name */
|
|
/* 70 */
|
|
REG_BADPAT, /* internal error: unknown opcode in find_fixedlength() */
|
|
REG_BADPAT, /* \N is not supported in a class */
|
|
REG_BADPAT, /* too many forward references */
|
|
REG_BADPAT, /* disallowed UTF-8/16/32 code point (>= 0xd800 && <= 0xdfff) */
|
|
REG_BADPAT, /* invalid UTF-16 string (should not occur) */
|
|
/* 75 */
|
|
REG_BADPAT, /* overlong MARK name */
|
|
REG_BADPAT, /* character value in \u.... sequence is too large */
|
|
REG_BADPAT /* invalid UTF-32 string (should not occur) */
|
|
};
|
|
|
|
/* Table of texts corresponding to POSIX error codes */
|
|
|
|
static const char *const pstring[] = {
|
|
"", /* Dummy for value 0 */
|
|
"internal error", /* REG_ASSERT */
|
|
"invalid repeat counts in {}", /* BADBR */
|
|
"pattern error", /* BADPAT */
|
|
"? * + invalid", /* BADRPT */
|
|
"unbalanced {}", /* EBRACE */
|
|
"unbalanced []", /* EBRACK */
|
|
"collation error - not relevant", /* ECOLLATE */
|
|
"bad class", /* ECTYPE */
|
|
"bad escape sequence", /* EESCAPE */
|
|
"empty expression", /* EMPTY */
|
|
"unbalanced ()", /* EPAREN */
|
|
"bad range inside []", /* ERANGE */
|
|
"expression too big", /* ESIZE */
|
|
"failed to get memory", /* ESPACE */
|
|
"bad back reference", /* ESUBREG */
|
|
"bad argument", /* INVARG */
|
|
"match failed" /* NOMATCH */
|
|
};
|
|
|
|
|
|
|
|
|
|
/*************************************************
|
|
* Translate error code to string *
|
|
*************************************************/
|
|
|
|
PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
|
|
regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
|
|
{
|
|
const char *message, *addmessage;
|
|
size_t length, addlength;
|
|
|
|
message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
|
|
"unknown error code" : pstring[errcode];
|
|
length = strlen(message) + 1;
|
|
|
|
addmessage = " at offset ";
|
|
addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
|
|
strlen(addmessage) + 6 : 0;
|
|
|
|
if (errbuf_size > 0)
|
|
{
|
|
if (addlength > 0 && errbuf_size >= length + addlength)
|
|
sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
|
|
else
|
|
{
|
|
strncpy(errbuf, message, errbuf_size - 1);
|
|
errbuf[errbuf_size-1] = 0;
|
|
}
|
|
}
|
|
|
|
return length + addlength;
|
|
}
|
|
|
|
|
|
|
|
|
|
/*************************************************
|
|
* Free store held by a regex *
|
|
*************************************************/
|
|
|
|
PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
|
|
regfree(regex_t *preg)
|
|
{
|
|
(PUBL(free))(preg->re_pcre);
|
|
}
|
|
|
|
|
|
|
|
|
|
/*************************************************
|
|
* Compile a regular expression *
|
|
*************************************************/
|
|
|
|
/*
|
|
Arguments:
|
|
preg points to a structure for recording the compiled expression
|
|
pattern the pattern to compile
|
|
cflags compilation flags
|
|
|
|
Returns: 0 on success
|
|
various non-zero codes on failure
|
|
*/
|
|
|
|
PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
|
|
regcomp(regex_t *preg, const char *pattern, int cflags)
|
|
{
|
|
const char *errorptr;
|
|
int erroffset;
|
|
int errorcode;
|
|
int options = 0;
|
|
int re_nsub = 0;
|
|
|
|
if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
|
|
if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
|
|
if ((cflags & REG_DOTALL) != 0) options |= PCRE_DOTALL;
|
|
if ((cflags & REG_NOSUB) != 0) options |= PCRE_NO_AUTO_CAPTURE;
|
|
if ((cflags & REG_UTF8) != 0) options |= PCRE_UTF8;
|
|
if ((cflags & REG_UCP) != 0) options |= PCRE_UCP;
|
|
if ((cflags & REG_UNGREEDY) != 0) options |= PCRE_UNGREEDY;
|
|
|
|
preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
|
|
&erroffset, NULL);
|
|
preg->re_erroffset = erroffset;
|
|
|
|
/* Safety: if the error code is too big for the translation vector (which
|
|
should not happen, but we all make mistakes), return REG_BADPAT. */
|
|
|
|
if (preg->re_pcre == NULL)
|
|
{
|
|
return (errorcode < (int)(sizeof(eint)/sizeof(const int)))?
|
|
eint[errorcode] : REG_BADPAT;
|
|
}
|
|
|
|
(void)pcre_fullinfo((const pcre *)preg->re_pcre, NULL, PCRE_INFO_CAPTURECOUNT,
|
|
&re_nsub);
|
|
preg->re_nsub = (size_t)re_nsub;
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
|
|
/*************************************************
|
|
* Match a regular expression *
|
|
*************************************************/
|
|
|
|
/* Unfortunately, PCRE requires 3 ints of working space for each captured
|
|
substring, so we have to get and release working store instead of just using
|
|
the POSIX structures as was done in earlier releases when PCRE needed only 2
|
|
ints. However, if the number of possible capturing brackets is small, use a
|
|
block of store on the stack, to reduce the use of malloc/free. The threshold is
|
|
in a macro that can be changed at configure time.
|
|
|
|
If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
|
|
be set. When this is the case, the nmatch and pmatch arguments are ignored, and
|
|
the only result is yes/no/error. */
|
|
|
|
PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
|
|
regexec(const regex_t *preg, const char *string, size_t nmatch,
|
|
regmatch_t pmatch[], int eflags)
|
|
{
|
|
int rc, so, eo;
|
|
int options = 0;
|
|
int *ovector = NULL;
|
|
int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
|
|
BOOL allocated_ovector = FALSE;
|
|
BOOL nosub =
|
|
(REAL_PCRE_OPTIONS((const pcre *)preg->re_pcre) & PCRE_NO_AUTO_CAPTURE) != 0;
|
|
|
|
if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
|
|
if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
|
|
if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;
|
|
|
|
((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
|
|
|
|
/* When no string data is being returned, or no vector has been passed in which
|
|
to put it, ensure that nmatch is zero. Otherwise, ensure the vector for holding
|
|
the return data is large enough. */
|
|
|
|
if (nosub || pmatch == NULL) nmatch = 0;
|
|
|
|
else if (nmatch > 0)
|
|
{
|
|
if (nmatch <= POSIX_MALLOC_THRESHOLD)
|
|
{
|
|
ovector = &(small_ovector[0]);
|
|
}
|
|
else
|
|
{
|
|
if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
|
|
ovector = (int *)malloc(sizeof(int) * nmatch * 3);
|
|
if (ovector == NULL) return REG_ESPACE;
|
|
allocated_ovector = TRUE;
|
|
}
|
|
}
|
|
|
|
/* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
|
|
The man page from OS X says "REG_STARTEND affects only the location of the
|
|
string, not how it is matched". That is why the "so" value is used to bump the
|
|
start location rather than being passed as a PCRE "starting offset". */
|
|
|
|
if ((eflags & REG_STARTEND) != 0)
|
|
{
|
|
so = pmatch[0].rm_so;
|
|
eo = pmatch[0].rm_eo;
|
|
}
|
|
else
|
|
{
|
|
so = 0;
|
|
eo = (int)strlen(string);
|
|
}
|
|
|
|
rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
|
|
0, options, ovector, (int)(nmatch * 3));
|
|
|
|
if (rc == 0) rc = (int)nmatch; /* All captured slots were filled in */
|
|
|
|
/* Successful match */
|
|
|
|
if (rc >= 0)
|
|
{
|
|
size_t i;
|
|
if (!nosub)
|
|
{
|
|
for (i = 0; i < (size_t)rc; i++)
|
|
{
|
|
pmatch[i].rm_so = ovector[i*2];
|
|
pmatch[i].rm_eo = ovector[i*2+1];
|
|
}
|
|
if (allocated_ovector) free(ovector);
|
|
for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Unsuccessful match */
|
|
|
|
if (allocated_ovector) free(ovector);
|
|
switch(rc)
|
|
{
|
|
/* ========================================================================== */
|
|
/* These cases are never obeyed. This is a fudge that causes a compile-time
|
|
error if the vector eint, which is indexed by compile-time error number, is
|
|
not the correct length. It seems to be the only way to do such a check at
|
|
compile time, as the sizeof() operator does not work in the C preprocessor.
|
|
As all the PCRE_ERROR_xxx values are negative, we can use 0 and 1. */
|
|
|
|
case 0:
|
|
case (sizeof(eint)/sizeof(int) == ERRCOUNT):
|
|
return REG_ASSERT;
|
|
/* ========================================================================== */
|
|
|
|
case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
|
|
case PCRE_ERROR_NULL: return REG_INVARG;
|
|
case PCRE_ERROR_BADOPTION: return REG_INVARG;
|
|
case PCRE_ERROR_BADMAGIC: return REG_INVARG;
|
|
case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
|
|
case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
|
|
case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
|
|
case PCRE_ERROR_BADUTF8: return REG_INVARG;
|
|
case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
|
|
case PCRE_ERROR_BADMODE: return REG_INVARG;
|
|
default: return REG_ASSERT;
|
|
}
|
|
}
|
|
|
|
/* End of pcreposix.c */
|