freebsd-dev/lib/libc/gen/fnmatch.c

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/*
* Copyright (c) 1989, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Guido van Rossum.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)fnmatch.c 8.2 (Berkeley) 4/16/94";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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/*
* Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
* Compares a filename or pathname to a pattern.
*/
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/*
* Some notes on multibyte character support:
* 1. Patterns with illegal byte sequences match nothing.
* 2. Illegal byte sequences in the "string" argument are handled by treating
* them as single-byte characters with a value of the first byte of the
* sequence cast to wchar_t.
* 3. Multibyte conversion state objects (mbstate_t) are passed around and
* used for most, but not all, conversions. Further work will be required
* to support state-dependent encodings.
*/
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#include <fnmatch.h>
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#include <limits.h>
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#include <string.h>
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#include <wchar.h>
#include <wctype.h>
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#include "collate.h"
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#define EOS '\0'
#define RANGE_MATCH 1
#define RANGE_NOMATCH 0
#define RANGE_ERROR (-1)
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static int rangematch(const char *, wchar_t, int, char **, mbstate_t *);
static int fnmatch1(const char *, const char *, int, mbstate_t, mbstate_t);
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int
fnmatch(pattern, string, flags)
const char *pattern, *string;
int flags;
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{
static const mbstate_t initial;
return (fnmatch1(pattern, string, flags, initial, initial));
}
static int
fnmatch1(pattern, string, flags, patmbs, strmbs)
const char *pattern, *string;
int flags;
mbstate_t patmbs, strmbs;
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{
const char *stringstart;
char *newp;
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char c;
wchar_t pc, sc;
size_t pclen, sclen;
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for (stringstart = string;;) {
pclen = mbrtowc(&pc, pattern, MB_LEN_MAX, &patmbs);
if (pclen == (size_t)-1 || pclen == (size_t)-2)
return (FNM_NOMATCH);
pattern += pclen;
sclen = mbrtowc(&sc, string, MB_LEN_MAX, &strmbs);
if (sclen == (size_t)-1 || sclen == (size_t)-2) {
sc = (unsigned char)*string;
sclen = 1;
memset(&strmbs, 0, sizeof(strmbs));
}
switch (pc) {
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case EOS:
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if ((flags & FNM_LEADING_DIR) && sc == '/')
return (0);
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return (sc == EOS ? 0 : FNM_NOMATCH);
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case '?':
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if (sc == EOS)
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return (FNM_NOMATCH);
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if (sc == '/' && (flags & FNM_PATHNAME))
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return (FNM_NOMATCH);
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if (sc == '.' && (flags & FNM_PERIOD) &&
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(string == stringstart ||
((flags & FNM_PATHNAME) && *(string - 1) == '/')))
return (FNM_NOMATCH);
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string += sclen;
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break;
case '*':
c = *pattern;
/* Collapse multiple stars. */
while (c == '*')
c = *++pattern;
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if (sc == '.' && (flags & FNM_PERIOD) &&
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(string == stringstart ||
((flags & FNM_PATHNAME) && *(string - 1) == '/')))
return (FNM_NOMATCH);
/* Optimize for pattern with * at end or before /. */
if (c == EOS)
if (flags & FNM_PATHNAME)
return ((flags & FNM_LEADING_DIR) ||
strchr(string, '/') == NULL ?
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0 : FNM_NOMATCH);
else
return (0);
else if (c == '/' && flags & FNM_PATHNAME) {
if ((string = strchr(string, '/')) == NULL)
return (FNM_NOMATCH);
break;
}
/* General case, use recursion. */
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while (sc != EOS) {
if (!fnmatch1(pattern, string,
flags & ~FNM_PERIOD, patmbs, strmbs))
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return (0);
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sclen = mbrtowc(&sc, string, MB_LEN_MAX,
&strmbs);
if (sclen == (size_t)-1 ||
sclen == (size_t)-2) {
sc = (unsigned char)*string;
sclen = 1;
memset(&strmbs, 0, sizeof(strmbs));
}
if (sc == '/' && flags & FNM_PATHNAME)
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break;
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string += sclen;
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}
return (FNM_NOMATCH);
case '[':
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if (sc == EOS)
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return (FNM_NOMATCH);
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if (sc == '/' && (flags & FNM_PATHNAME))
return (FNM_NOMATCH);
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if (sc == '.' && (flags & FNM_PERIOD) &&
(string == stringstart ||
((flags & FNM_PATHNAME) && *(string - 1) == '/')))
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return (FNM_NOMATCH);
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switch (rangematch(pattern, sc, flags, &newp,
&patmbs)) {
case RANGE_ERROR:
goto norm;
case RANGE_MATCH:
pattern = newp;
break;
case RANGE_NOMATCH:
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return (FNM_NOMATCH);
}
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string += sclen;
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break;
case '\\':
if (!(flags & FNM_NOESCAPE)) {
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pclen = mbrtowc(&pc, pattern, MB_LEN_MAX,
&patmbs);
if (pclen == (size_t)-1 || pclen == (size_t)-2)
return (FNM_NOMATCH);
if (pclen == 0)
pc = '\\';
pattern += pclen;
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}
/* FALLTHROUGH */
default:
norm:
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if (pc == sc)
;
else if ((flags & FNM_CASEFOLD) &&
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(towlower(pc) == towlower(sc)))
;
else
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return (FNM_NOMATCH);
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string += sclen;
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break;
}
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}
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/* NOTREACHED */
}
static int
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rangematch(pattern, test, flags, newp, patmbs)
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const char *pattern;
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wchar_t test;
int flags;
char **newp;
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mbstate_t *patmbs;
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{
int negate, ok;
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wchar_t c, c2;
size_t pclen;
const char *origpat;
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/*
* A bracket expression starting with an unquoted circumflex
* character produces unspecified results (IEEE 1003.2-1992,
* 3.13.2). This implementation treats it like '!', for
* consistency with the regular expression syntax.
* J.T. Conklin (conklin@ngai.kaleida.com)
*/
if ( (negate = (*pattern == '!' || *pattern == '^')) )
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++pattern;
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if (flags & FNM_CASEFOLD)
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test = towlower(test);
/*
* A right bracket shall lose its special meaning and represent
* itself in a bracket expression if it occurs first in the list.
* -- POSIX.2 2.8.3.2
*/
ok = 0;
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origpat = pattern;
for (;;) {
if (*pattern == ']' && pattern > origpat) {
pattern++;
break;
} else if (*pattern == '\0') {
return (RANGE_ERROR);
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} else if (*pattern == '/' && (flags & FNM_PATHNAME)) {
return (RANGE_NOMATCH);
} else if (*pattern == '\\' && !(flags & FNM_NOESCAPE))
pattern++;
pclen = mbrtowc(&c, pattern, MB_LEN_MAX, patmbs);
if (pclen == (size_t)-1 || pclen == (size_t)-2)
return (RANGE_NOMATCH);
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pattern += pclen;
if (flags & FNM_CASEFOLD)
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c = towlower(c);
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if (*pattern == '-' && *(pattern + 1) != EOS &&
*(pattern + 1) != ']') {
if (*++pattern == '\\' && !(flags & FNM_NOESCAPE))
if (*pattern != EOS)
pattern++;
pclen = mbrtowc(&c2, pattern, MB_LEN_MAX, patmbs);
if (pclen == (size_t)-1 || pclen == (size_t)-2)
return (RANGE_NOMATCH);
pattern += pclen;
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if (c2 == EOS)
return (RANGE_ERROR);
if (flags & FNM_CASEFOLD)
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c2 = towlower(c2);
if (__collate_load_error ?
c <= test && test <= c2 :
__collate_range_cmp(c, test) <= 0
&& __collate_range_cmp(test, c2) <= 0
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)
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ok = 1;
} else if (c == test)
ok = 1;
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}
*newp = (char *)pattern;
return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH);
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}