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
25/* Return the address of the last file name component of NAME.  If
26   NAME has no relative file name components because it is a file
27   system root, return the empty string.  */
28
29char *
30last_component (char const *name)
31{
32  char const *base = name + FILE_SYSTEM_PREFIX_LEN (name);
33  char const *p;
34  bool saw_slash = false;
35
36  while (ISSLASH (*base))
37    base++;
38
39  for (p = base; *p; p++)
40    {
41      if (ISSLASH (*p))
42        saw_slash = true;
43      else if (saw_slash)
44        {
45          base = p;
46          saw_slash = false;
47        }
48    }
49
50  return (char *) base;
51}
52
53/* Return the length of the basename NAME.  Typically NAME is the
54   value returned by base_name or last_component.  Act like strlen
55   (NAME), except omit all trailing slashes.  */
56
57size_t
58base_len (char const *name)
59{
60  size_t len;
61  size_t prefix_len = FILE_SYSTEM_PREFIX_LEN (name);
62
63  for (len = strlen (name);  1 < len && ISSLASH (name[len - 1]);  len--)
64    continue;
65
66  if (DOUBLE_SLASH_IS_DISTINCT_ROOT && len == 1
67      && ISSLASH (name[0]) && ISSLASH (name[1]) && ! name[2])
68    return 2;
69
70  if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len
71      && len == prefix_len && ISSLASH (name[prefix_len]))
72    return prefix_len + 1;
73
74  return len;
75}
76