1/* basename.c -- return the last element in a path
2   Copyright (C) 1990, 1998, 1999, 2000, 2001 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#if STDC_HEADERS || HAVE_STRING_H
23# include <string.h>
24#endif
25#include "dirname.h"
26
27/* In general, we can't use the builtin `basename' function if available,
28   since it has different meanings in different environments.
29   In some environments the builtin `basename' modifies its argument.
30
31   Return the address of the last file name component of NAME.  If
32   NAME has no file name components because it is all slashes, return
33   NAME if it is empty, the address of its last slash otherwise.  */
34
35char *
36base_name (char const *name)
37{
38  char const *base = name + FILESYSTEM_PREFIX_LEN (name);
39  char const *p;
40
41  for (p = base; *p; p++)
42    {
43      if (ISSLASH (*p))
44	{
45	  /* Treat multiple adjacent slashes like a single slash.  */
46	  do p++;
47	  while (ISSLASH (*p));
48
49	  /* If the file name ends in slash, use the trailing slash as
50	     the basename if no non-slashes have been found.  */
51	  if (! *p)
52	    {
53	      if (ISSLASH (*base))
54		base = p - 1;
55	      break;
56	    }
57
58	  /* *P is a non-slash preceded by a slash.  */
59	  base = p;
60	}
61    }
62
63  return (char *) base;
64}
65
66/* Return the length of of the basename NAME.  Typically NAME is the
67   value returned by base_name.  Act like strlen (NAME), except omit
68   redundant trailing slashes.  */
69
70size_t
71base_len (char const *name)
72{
73  size_t len;
74
75  for (len = strlen (name);  1 < len && ISSLASH (name[len - 1]);  len--)
76    continue;
77
78  return len;
79}
80