mirror of
https://github.com/qpdf/qpdf.git
synced 2024-12-23 19:39:04 +00:00
306 lines
10 KiB
C
306 lines
10 KiB
C
/*************************************************
|
|
* Perl-Compatible Regular Expressions *
|
|
*************************************************/
|
|
|
|
/*
|
|
This is a library of functions to support regular expressions whose syntax
|
|
and semantics are as close as possible to those of the Perl 5 language. See
|
|
the file Tech.Notes for some information on the internals.
|
|
|
|
This module is a wrapper that provides a POSIX API to the underlying PCRE
|
|
functions.
|
|
|
|
Written by: Philip Hazel <ph10@cam.ac.uk>
|
|
|
|
Copyright (c) 1997-2003 University of Cambridge
|
|
|
|
-----------------------------------------------------------------------------
|
|
Permission is granted to anyone to use this software for any purpose on any
|
|
computer system, and to redistribute it freely, subject to the following
|
|
restrictions:
|
|
|
|
1. This software is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
|
|
2. The origin of this software must not be misrepresented, either by
|
|
explicit claim or by omission.
|
|
|
|
3. Altered versions must be plainly marked as such, and must not be
|
|
misrepresented as being the original software.
|
|
|
|
4. If PCRE is embedded in any software that is released under the GNU
|
|
General Purpose Licence (GPL), then the terms of that licence shall
|
|
supersede any condition above with which it is incompatible.
|
|
-----------------------------------------------------------------------------
|
|
*/
|
|
|
|
#include "internal.h"
|
|
#include "pcreposix.h"
|
|
#include "stdlib.h"
|
|
|
|
|
|
|
|
/* Corresponding tables of PCRE error messages and POSIX error codes. */
|
|
|
|
static const char *const estring[] = {
|
|
ERR1, ERR2, ERR3, ERR4, ERR5, ERR6, ERR7, ERR8, ERR9, ERR10,
|
|
ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19, ERR20,
|
|
ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR29, ERR29, ERR30,
|
|
ERR31, ERR32, ERR33, ERR34, ERR35, ERR36, ERR37, ERR38, ERR39, ERR40,
|
|
ERR41, ERR42, ERR43, ERR44 };
|
|
|
|
static const int eint[] = {
|
|
REG_EESCAPE, /* "\\ at end of pattern" */
|
|
REG_EESCAPE, /* "\\c at end of pattern" */
|
|
REG_EESCAPE, /* "unrecognized character follows \\" */
|
|
REG_BADBR, /* "numbers out of order in {} quantifier" */
|
|
REG_BADBR, /* "number too big in {} quantifier" */
|
|
REG_EBRACK, /* "missing terminating ] for character class" */
|
|
REG_ECTYPE, /* "invalid escape sequence in character class" */
|
|
REG_ERANGE, /* "range out of order in character class" */
|
|
REG_BADRPT, /* "nothing to repeat" */
|
|
REG_BADRPT, /* "operand of unlimited repeat could match the empty string" */
|
|
REG_ASSERT, /* "internal error: unexpected repeat" */
|
|
REG_BADPAT, /* "unrecognized character after (?" */
|
|
REG_BADPAT, /* "POSIX named classes are supported only within a class" */
|
|
REG_EPAREN, /* "missing )" */
|
|
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" */
|
|
REG_ESIZE, /* "regular expression too large" */
|
|
REG_ESPACE, /* "failed to get memory" */
|
|
REG_EPAREN, /* "unmatched brackets" */
|
|
REG_ASSERT, /* "internal error: code overflow" */
|
|
REG_BADPAT, /* "unrecognized character after (?<" */
|
|
REG_BADPAT, /* "lookbehind assertion is not fixed length" */
|
|
REG_BADPAT, /* "malformed number after (?(" */
|
|
REG_BADPAT, /* "conditional group containe more than two branches" */
|
|
REG_BADPAT, /* "assertion expected after (?(" */
|
|
REG_BADPAT, /* "(?R or (?digits must be followed by )" */
|
|
REG_ECTYPE, /* "unknown POSIX class name" */
|
|
REG_BADPAT, /* "POSIX collating elements are not supported" */
|
|
REG_INVARG, /* "this version of PCRE is not compiled with PCRE_UTF8 support" */
|
|
REG_BADPAT, /* "spare error" */
|
|
REG_BADPAT, /* "character value in \x{...} sequence is too large" */
|
|
REG_BADPAT, /* "invalid condition (?(0)" */
|
|
REG_BADPAT, /* "\\C not allowed in lookbehind assertion" */
|
|
REG_EESCAPE, /* "PCRE does not support \\L, \\l, \\N, \\P, \\p, \\U, \\u, or \\X" */
|
|
REG_BADPAT, /* "number after (?C is > 255" */
|
|
REG_BADPAT, /* "closing ) for (?C expected" */
|
|
REG_BADPAT, /* "recursive call could loop indefinitely" */
|
|
REG_BADPAT, /* "unrecognized character after (?P" */
|
|
REG_BADPAT, /* "syntax error after (?P" */
|
|
REG_BADPAT, /* "two named groups have the same name" */
|
|
REG_BADPAT /* "invalid UTF-8 string" */
|
|
};
|
|
|
|
/* 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 PCRE text code to int *
|
|
*************************************************/
|
|
|
|
/* PCRE compile-time errors are given as strings defined as macros. We can just
|
|
look them up in a table to turn them into POSIX-style error codes. */
|
|
|
|
static int
|
|
pcre_posix_error_code(const char *s)
|
|
{
|
|
size_t i;
|
|
for (i = 0; i < sizeof(estring)/sizeof(char *); i++)
|
|
if (strcmp(s, estring[i]) == 0) return eint[i];
|
|
return REG_ASSERT;
|
|
}
|
|
|
|
|
|
|
|
/*************************************************
|
|
* Translate error code to string *
|
|
*************************************************/
|
|
|
|
EXPORT size_t
|
|
regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
|
|
{
|
|
const char *message, *addmessage;
|
|
size_t length, addlength;
|
|
|
|
message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
|
|
"unknown error code" : pstring[errcode];
|
|
length = strlen(message) + 1;
|
|
|
|
addmessage = " at offset ";
|
|
addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
|
|
strlen(addmessage) + 6 : 0;
|
|
|
|
if (errbuf_size > 0)
|
|
{
|
|
if (addlength > 0 && errbuf_size >= length + addlength)
|
|
sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
|
|
else
|
|
{
|
|
strncpy(errbuf, message, errbuf_size - 1);
|
|
errbuf[errbuf_size-1] = 0;
|
|
}
|
|
}
|
|
|
|
return length + addlength;
|
|
}
|
|
|
|
|
|
|
|
|
|
/*************************************************
|
|
* Free store held by a regex *
|
|
*************************************************/
|
|
|
|
EXPORT void
|
|
regfree(regex_t *preg)
|
|
{
|
|
(pcre_free)(preg->re_pcre);
|
|
}
|
|
|
|
|
|
|
|
|
|
/*************************************************
|
|
* Compile a regular expression *
|
|
*************************************************/
|
|
|
|
/*
|
|
Arguments:
|
|
preg points to a structure for recording the compiled expression
|
|
pattern the pattern to compile
|
|
cflags compilation flags
|
|
|
|
Returns: 0 on success
|
|
various non-zero codes on failure
|
|
*/
|
|
|
|
EXPORT int
|
|
regcomp(regex_t *preg, const char *pattern, int cflags)
|
|
{
|
|
const char *errorptr;
|
|
int erroffset;
|
|
int options = 0;
|
|
|
|
if ((cflags & REG_ICASE) != 0) options |= PCRE_CASELESS;
|
|
if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
|
|
|
|
preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);
|
|
preg->re_erroffset = erroffset;
|
|
|
|
if (preg->re_pcre == NULL) return pcre_posix_error_code(errorptr);
|
|
|
|
preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
|
|
/*************************************************
|
|
* Match a regular expression *
|
|
*************************************************/
|
|
|
|
/* Unfortunately, PCRE requires 3 ints of working space for each captured
|
|
substring, so we have to get and release working store instead of just using
|
|
the POSIX structures as was done in earlier releases when PCRE needed only 2
|
|
ints. 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. */
|
|
|
|
EXPORT int
|
|
regexec(const regex_t *preg, const char *string, size_t nmatch,
|
|
regmatch_t pmatch[], int eflags)
|
|
{
|
|
int rc;
|
|
int options = 0;
|
|
int *ovector = NULL;
|
|
int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
|
|
BOOL allocated_ovector = FALSE;
|
|
|
|
if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
|
|
if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
|
|
|
|
((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */
|
|
|
|
if (nmatch > 0)
|
|
{
|
|
if (nmatch <= POSIX_MALLOC_THRESHOLD)
|
|
{
|
|
ovector = &(small_ovector[0]);
|
|
}
|
|
else
|
|
{
|
|
ovector = (int *)malloc(sizeof(int) * nmatch * 3);
|
|
if (ovector == NULL) return REG_ESPACE;
|
|
allocated_ovector = TRUE;
|
|
}
|
|
}
|
|
|
|
rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
|
|
0, options, ovector, nmatch * 3);
|
|
|
|
if (rc == 0) rc = nmatch; /* All captured slots were filled in */
|
|
|
|
if (rc >= 0)
|
|
{
|
|
size_t i;
|
|
for (i = 0; i < (size_t)rc; i++)
|
|
{
|
|
pmatch[i].rm_so = ovector[i*2];
|
|
pmatch[i].rm_eo = ovector[i*2+1];
|
|
}
|
|
if (allocated_ovector) free(ovector);
|
|
for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
|
|
return 0;
|
|
}
|
|
|
|
else
|
|
{
|
|
if (allocated_ovector) free(ovector);
|
|
switch(rc)
|
|
{
|
|
case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
|
|
case PCRE_ERROR_NULL: return REG_INVARG;
|
|
case PCRE_ERROR_BADOPTION: return REG_INVARG;
|
|
case PCRE_ERROR_BADMAGIC: return REG_INVARG;
|
|
case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
|
|
case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
|
|
case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
|
|
case PCRE_ERROR_BADUTF8: return REG_INVARG;
|
|
case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
|
|
default: return REG_ASSERT;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* End of pcreposix.c */
|