/* Return the name-within-directory of a file name.
  Copyright (C) 1996-1999, 2000-2002, 2004, 2006 Free Software Foundation, Inc.

  NOTE: The canonical source of this file is maintained with the GNU C Library.
  Bugs can be reported to [email protected].

  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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  USA.  */

#include <config.h>

/* Specification.  */
#include "basename.h"

#if !(__GLIBC__ >= 2)

#include <stdio.h>
#include <assert.h>

#if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__
 /* Win32, Cygwin, OS/2, DOS */
# define HAS_DEVICE(P) \
   ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \
    && (P)[1] == ':')
# define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
# define ISSLASH(C) ((C) == '/' || (C) == '\\')
#endif

#ifndef FILE_SYSTEM_PREFIX_LEN
# define FILE_SYSTEM_PREFIX_LEN(Filename) 0
#endif

#ifndef ISSLASH
# define ISSLASH(C) ((C) == '/')
#endif

#ifndef _LIBC
/* We cannot generally use the name `basename' since XPG defines an unusable
  variant of the function but we cannot use it.  */
# undef basename
# define basename gnu_basename
#endif

/* In general, we can't use the builtin `basename' function if available,
  since it has different meanings in different environments.
  In some environments the builtin `basename' modifies its argument.
  If NAME is all slashes, be sure to return `/'.  */

char *
basename (char const *name)
{
 char const *base = name += FILE_SYSTEM_PREFIX_LEN (name);
 int all_slashes = 1;
 char const *p;

 for (p = name; *p; p++)
   {
     if (ISSLASH (*p))
       base = p + 1;
     else
       all_slashes = 0;
   }

 /* If NAME is all slashes, arrange to return `/'.  */
 if (*base == '\0' && ISSLASH (*name) && all_slashes)
   --base;

 /* Make sure the last byte is not a slash.  */
 assert (all_slashes || !ISSLASH (*(p - 1)));

 return (char *) base;
}

#endif