/*
	fnmatch.c

	(description)

	Copyright (C) 1991, 1992, 1993 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
	of the License, 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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

*/
static const char rcsid[] = 
	"$Id$";

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif

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

#include "fnmatch.h"

/* Comment out all this code if we are using the GNU C Library, and are not
   actually compiling the library itself.  This code is part of the GNU C
   Library, but also included in many other GNU distributions.  Compiling
   and linking in this code is a waste when using the GNU C library
   (especially if it is a shared library).  Rather than having every GNU
   program understand `configure --with-gnu-libc' and omit the object files,
   it is simpler to just do this in the source for each such file.
*/

#if defined (_LIBC) || !defined (__GNU_LIBRARY__)

#if !defined(__GNU_LIBRARY__) && !defined(STDC_HEADERS)
extern int  errno;
#endif

/* Match STRING against the filename pattern PATTERN, returning zero if
   it matches, nonzero if not.  */
int
fnmatch (pattern, string, flags)
const char *pattern;
const char *string;
int         flags;
{
	register const char *p = pattern, *n = string;
	register unsigned char c;

/* Note that this evalutes C many times.  */
#define FOLD(c)	((flags & FNM_CASEFOLD) && isupper (c) ? tolower (c) : (c))

#ifdef _WIN32
	flags |= FNM_CASEFOLD;
#endif

	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++;
					c = FOLD (c);
				}
				if (FOLD ((unsigned char) *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++, ++n)
					if (((flags & FNM_FILE_NAME) && *n == '/') ||
						(c == '?' && *n == '\0'))
						return FNM_NOMATCH;

				if (c == '\0')
					return 0;

				{
					unsigned char c1 = (!(flags & FNM_NOESCAPE)
										&& c == '\\') ? *p : c;

					c1 = FOLD (c1);
					for (--p; *n != '\0'; ++n)
						if ((c == '[' || FOLD ((unsigned char) *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 unsigned char cstart = c, cend = c;

						if (!(flags & FNM_NOESCAPE) && c == '\\')
							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 ((unsigned char) *n) >= cstart
							&& FOLD ((unsigned char) *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 == '\\')
							/* XXX 1003.2d11 is unclear if this is right.  */
							++p;
					}
					if (not)
						return FNM_NOMATCH;
				}
				break;

			default:
				if (c != FOLD ((unsigned char) *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;
}

#endif /* _LIBC or not __GNU_LIBRARY__.  */