/* Copyright 1991, 1992, 1993, 1996, 1997, 2000 Free Software Foundation, Inc.

/* $NetBSD: fnmatch.c,v 1.1.1.1 2016/01/10 21:36:18 christos Exp $ */

/* Copyright 1991, 1992, 1993, 1996, 1997, 2000 Free Software Foundation, Inc.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

This program 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. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */

#if HAVE_CONFIG_H
# include <config.h>
#endif

/* Enable GNU extensions in fnmatch.h. */
#ifndef _GNU_SOURCE
# define _GNU_SOURCE 1
#endif

#include <errno.h>
#include <fnmatch.h>
#include <ctype.h>

#if defined STDC_HEADERS || !defined isascii
# define IN_CTYPE_DOMAIN(c) 1
#else
# define IN_CTYPE_DOMAIN(c) isascii (c)
#endif

#define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c))

#ifndef errno
extern int errno;
#endif

/* 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 ((unsigned char) (c)) \
? tolower ((unsigned char) (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 (c == '?')
{
/* A ? needs to match one character. */
if (*n == '\0' || (*n == '/' && (flags & FNM_FILE_NAME)))
/* 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')
{
if ((flags & (FNM_FILE_NAME | FNM_LEADING_DIR)) == FNM_FILE_NAME)
for (; *n != '\0'; n++)
if (*n == '/')
return FNM_NOMATCH;
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;
else if (*n == '/' && (flags & FNM_FILE_NAME))
break;
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
}