1/* basename.c -- return the last element in a path
2   Copyright (C) 1990, 1998, 1999 Free Software Foundation, Inc.
3
4   This program is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 2, or (at your option)
7   any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program; if not, write to the Free Software Foundation,
16   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
17
18#if HAVE_CONFIG_H
19# include <config.h>
20#endif
21
22#ifndef FILESYSTEM_PREFIX_LEN
23# define FILESYSTEM_PREFIX_LEN(Filename) 0
24#endif
25
26#ifndef ISSLASH
27# define ISSLASH(C) ((C) == '/')
28#endif
29
30/* In general, we can't use the builtin `basename' function if available,
31   since it has different meanings in different environments.
32   In some environments the builtin `basename' modifies its argument.
33   If NAME is all slashes, be sure to return `/'.  */
34
35char *
36base_name (char const *name)
37{
38  char const *base = name += FILESYSTEM_PREFIX_LEN (name);
39  int all_slashes = 1;
40  char const *p;
41
42  for (p = name; *p; p++)
43    {
44      if (ISSLASH (*p))
45	base = p + 1;
46      else
47	all_slashes = 0;
48    }
49
50  /* If NAME is all slashes, arrange to return `/'.  */
51  if (*base == '\0' && ISSLASH (*name) && all_slashes)
52    --base;
53
54  return (char *) base;
55}
56