/****************************************************************************
 *
 * $Source: /usr/local/cvsroot/gccsdk/unixlib/source/unix/fnmatch.c,v $
 * $Date: 2001/01/29 15:10:22 $
 * $Revision: 1.2 $
 * $State: Exp $
 * $Author: admin $
 *
 ***************************************************************************/

#ifdef EMBED_RCSID
static const char rcs_id[] = "$Id: fnmatch.c,v 1.2 2001/01/29 15:10:22 admin Exp $";
#endif

/*      $NetBSD: fnmatch.c,v 1.11 1995/02/27 03:43:06 cgd Exp $ */

/*
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 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.
 */


/*
 * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
 * Compares a filename or pathname to a pattern.
 */

#include <fnmatch.h>
#include <string.h>

#define	EOS	'\0'

static const char *rangematch (const char *, int, 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:
	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 (strchr (string, '/') == NULL ?
		    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. */
	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);
	if ((pattern =
	     rangematch (pattern, *string, flags)) == NULL)
	  return (FNM_NOMATCH);
	++string;
	break;
      case '\\':
	if (!(flags & FNM_NOESCAPE))
	  {
	    if ((c = *pattern++) == EOS)
	      {
		c = '\\';
		--pattern;
	      }
	  }
	/* FALLTHROUGH */
      default:
	if (c != *string++)
	  return (FNM_NOMATCH);
	break;
      }
  /* NOTREACHED */
}

static const char *
rangematch (const char *pattern, int 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;

  for (ok = 0; (c = *pattern++) != ']';)
    {
      if (c == '\\' && !(flags & FNM_NOESCAPE))
	c = *pattern++;
      if (c == EOS)
	return (NULL);
      if (*pattern == '-'
	  && (c2 = *(pattern + 1)) != EOS && c2 != ']')
	{
	  pattern += 2;
	  if (c2 == '\\' && !(flags & FNM_NOESCAPE))
	    c2 = *pattern++;
	  if (c2 == EOS)
	    return (NULL);
	  if (c <= test && test <= c2)
	    ok = 1;
	}
      else if (c == test)
	ok = 1;
    }
  return (ok == negate ? NULL : pattern);
}
