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/* SPDX-License-Identifier: BSD-3-Clause
* 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char sccsid[] = "@(#)fnmatch.c 8.2 (Berkeley) 4/16/94";
#endif /* LIBC_SCCS and not lint */
/*
* Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
* Compares a filename or pathname to a pattern.
*/
#include <ctype.h>
#include <string.h>
#include <stdio.h>
#include "fnmatch.h"
#define EOS '\0'
static const char *rangematch(const char *, char, int);
int
fnmatch(const char *pattern, const char *string, int flags)
{
const char *stringstart;
char c, test;
for (stringstart = string;;)
switch (c = *pattern++) {
case EOS:
if ((flags & FNM_LEADING_DIR) && *string == '/')
return (0);
return (*string == EOS ? 0 : FNM_NOMATCH);
case '?':
if (*string == EOS)
return (FNM_NOMATCH);
if (*string == '/' && (flags & FNM_PATHNAME))
return (FNM_NOMATCH);
if (*string == '.' && (flags & FNM_PERIOD) &&
(string == stringstart ||
((flags & FNM_PATHNAME) && *(string - 1) == '/')))
return (FNM_NOMATCH);
++string;
break;
case '*':
c = *pattern;
/* Collapse multiple stars. */
while (c == '*')
c = *++pattern;
if (*string == '.' && (flags & FNM_PERIOD) &&
(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 ?
0 : FNM_NOMATCH);
else
return (0);
else if (c == '/' && flags & FNM_PATHNAME) {
string = strchr(string, '/');
if (string == NULL)
return (FNM_NOMATCH);
break;
}
/* General case, use recursion. */
while ((test = *string) != EOS) {
if (!fnmatch(pattern, string,
flags & ~FNM_PERIOD))
return (0);
if (test == '/' && flags & FNM_PATHNAME)
break;
++string;
}
return (FNM_NOMATCH);
case '[':
if (*string == EOS)
return (FNM_NOMATCH);
if (*string == '/' && flags & FNM_PATHNAME)
return (FNM_NOMATCH);
pattern = rangematch(pattern, *string, flags);
if (pattern == NULL)
return (FNM_NOMATCH);
++string;
break;
case '\\':
if (!(flags & FNM_NOESCAPE)) {
c = *pattern++;
if (c == EOS) {
c = '\\';
--pattern;
}
}
/* FALLTHROUGH */
default:
if (c == *string)
;
else if ((flags & FNM_CASEFOLD) &&
(tolower((unsigned char)c) ==
tolower((unsigned char)*string)))
;
else if ((flags & FNM_PREFIX_DIRS) && *string == EOS &&
((c == '/' && string != stringstart) ||
(string == stringstart+1 && *stringstart == '/')))
return (0);
else
return (FNM_NOMATCH);
string++;
break;
}
/* NOTREACHED */
}
static const char *
rangematch(const char *pattern, char test, int flags)
{
int negate, ok;
char c, c2;
/*
* 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)
*/
negate = (*pattern == '!' || *pattern == '^');
if (negate)
++pattern;
if (flags & FNM_CASEFOLD)
test = tolower((unsigned char)test);
for (ok = 0; (c = *pattern++) != ']';) {
if (c == '\\' && !(flags & FNM_NOESCAPE))
c = *pattern++;
if (c == EOS)
return (NULL);
if (flags & FNM_CASEFOLD)
c = tolower((unsigned char)c);
c2 = *(pattern + 1);
if (*pattern == '-' && c2 != EOS && c2 != ']') {
pattern += 2;
if (c2 == '\\' && !(flags & FNM_NOESCAPE))
c2 = *pattern++;
if (c2 == EOS)
return (NULL);
if (flags & FNM_CASEFOLD)
c2 = tolower((unsigned char)c2);
if ((unsigned char)c <= (unsigned char)test &&
(unsigned char)test <= (unsigned char)c2)
ok = 1;
} else if (c == test)
ok = 1;
}
return (ok == negate ? NULL : pattern);
}
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