1/* basename.c -- return the last element in a file name
2
3   Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2012 Free Software
4   Foundation, Inc.
5
6   This program is free software: you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 3 of the License, or
9   (at your option) any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
18
19#include <config.h>
20
21#include "dirname.h"
22
23#include <string.h>
24#include "xalloc.h"
25#include "xstrndup.h"
26
27char *
28base_name (char const *name)
29{
30  char const *base = last_component (name);
31  size_t length;
32
33  /* If there is no last component, then name is a file system root or the
34     empty string.  */
35  if (! *base)
36    return xstrndup (name, base_len (name));
37
38  /* Collapse a sequence of trailing slashes into one.  */
39  length = base_len (base);
40  if (ISSLASH (base[length]))
41    length++;
42
43  /* On systems with drive letters, "a/b:c" must return "./b:c" rather
44     than "b:c" to avoid confusion with a drive letter.  On systems
45     with pure POSIX semantics, this is not an issue.  */
46  if (FILE_SYSTEM_PREFIX_LEN (base))
47    {
48      char *p = xmalloc (length + 3);
49      p[0] = '.';
50      p[1] = '/';
51      memcpy (p + 2, base, length);
52      p[length + 2] = '\0';
53      return p;
54    }
55
56  /* Finally, copy the basename.  */
57  return xstrndup (base, length);
58}
59