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// SPDX-License-Identifier: LGPL-2.1-or-later
// SPDX-FileCopyrightText: (C) 1991, 1992, 1993, 1996 Free Software Foundation, Inc.
#include <errno.h>
#include <fnmatch.h>
#include <linux/ctype.h>
# define ISUPPER(c) (isascii(c) && isupper(c))
/* Match STRING against the filename pattern PATTERN, returning zero if
it matches, nonzero if not. */
int fnmatch(const char *pattern, const char *string, int flags)
{
register const char *p = pattern, *n = string;
register char c;
/* Note that this evaluates C many times. */
# define FOLD(c) ((flags & FNM_CASEFOLD) && ISUPPER (c) ? tolower (c) : (c))
while ((c = *p++) != '\0') {
c = FOLD(c);
switch (c) {
case '?':
if (*n == '\0')
return FNM_NOMATCH;
else if ((flags & FNM_FILE_NAME) && *n == '/')
return FNM_NOMATCH;
else if ((flags & FNM_PERIOD) && *n == '.' &&
(n == string
|| ((flags & FNM_FILE_NAME)
&& n[-1] == '/'))) return FNM_NOMATCH;
break;
case '\\':
if (!(flags & FNM_NOESCAPE)) {
c = *p++;
if (c == '\0')
/* Trailing \ loses. */
return FNM_NOMATCH;
c = FOLD(c);
}
if (FOLD(*n) != c)
return FNM_NOMATCH;
break;
case '*':
if ((flags & FNM_PERIOD) && *n == '.' &&
(n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
return FNM_NOMATCH;
for (c = *p++; c == '?' || c == '*'; c = *p++) {
if ((flags & FNM_FILE_NAME) && *n == '/')
/* A slash does not match a wildcard under FNM_FILE_NAME. */
return FNM_NOMATCH;
else if (c == '?') {
/* A ? needs to match one character. */
if (*n == '\0')
/* There isn't another character; no match. */
return FNM_NOMATCH;
else
/* One character of the string is consumed in matching
this ? wildcard, so *??? won't match if there are
less than three characters. */
++n;
}
}
if (c == '\0')
return 0;
{
char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
c1 = FOLD(c1);
for (--p; *n != '\0'; ++n)
if ((c == '[' || FOLD(*n) == c1) &&
fnmatch(p, n, flags & ~FNM_PERIOD) == 0)
return 0;
return FNM_NOMATCH;
}
case '[':
{
/* Nonzero if the sense of the character class is inverted. */
register int not;
if (*n == '\0')
return FNM_NOMATCH;
if ((flags & FNM_PERIOD) && *n == '.' &&
(n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
return FNM_NOMATCH;
not = (*p == '!' || *p == '^');
if (not)
++p;
c = *p++;
for (;;) {
register char cstart = c, cend = c;
if (!(flags & FNM_NOESCAPE) && c == '\\') {
if (*p == '\0')
return FNM_NOMATCH;
cstart = cend = *p++;
}
cstart = cend = FOLD(cstart);
if (c == '\0')
/* [ (unterminated) loses. */
return FNM_NOMATCH;
c = *p++;
c = FOLD(c);
if ((flags & FNM_FILE_NAME) && c == '/')
/* [/] can never match. */
return FNM_NOMATCH;
if (c == '-' && *p != ']') {
cend = *p++;
if (!(flags & FNM_NOESCAPE) && cend == '\\')
cend = *p++;
if (cend == '\0')
return FNM_NOMATCH;
cend = FOLD(cend);
c = *p++;
}
if (FOLD(*n) >= cstart && FOLD(*n) <= cend)
goto matched;
if (c == ']')
break;
}
if (!not)
return FNM_NOMATCH;
break;
matched:;
/* Skip the rest of the [...] that already matched. */
while (c != ']') {
if (c == '\0')
/* [... (unterminated) loses. */
return FNM_NOMATCH;
c = *p++;
if (!(flags & FNM_NOESCAPE) && c == '\\') {
if (*p == '\0')
return FNM_NOMATCH;
/* XXX 1003.2d11 is unclear if this is right. */
++p;
}
}
if (not)
return FNM_NOMATCH;
}
break;
default:
if (c != FOLD(*n))
return FNM_NOMATCH;
}
++n;
}
if (*n == '\0')
return 0;
if ((flags & FNM_LEADING_DIR) && *n == '/')
/* The FNM_LEADING_DIR flag says that "foo*" matches "foobar/frobozz". */
return 0;
return FNM_NOMATCH;
# undef FOLD
}
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