basename-lgpl.c revision 1.1.1.2 
1/* basename.c -- return the last element in a file name
2
3   Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2022 Free Software
4   Foundation, Inc.
5
6   This file is free software: you can redistribute it and/or modify
7   it under the terms of the GNU Lesser General Public License as
8   published by the Free Software Foundation; either version 2.1 of the
9   License, or (at your option) any later version.
10
11   This file 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 Lesser General Public License for more details.
15
16   You should have received a copy of the GNU Lesser General Public License
17   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
18
19#include <config.h>
20
21/* Specification.  */
22#include "basename-lgpl.h"
23
24#include <stdbool.h>
25#include <string.h>
26
27#include "filename.h"
28
29char *
30last_component (char const *name)
31{
32  char const *base = name + FILE_SYSTEM_PREFIX_LEN (name);
33  char const *p;
34  bool last_was_slash = false;
35
36  while (ISSLASH (*base))
37    base++;
38
39  for (p = base; *p; p++)
40    {
41      if (ISSLASH (*p))
42        last_was_slash = true;
43      else if (last_was_slash)
44        {
45          base = p;
46          last_was_slash = false;
47        }
48    }
49
50  return (char *) base;
51}
52
53size_t
54base_len (char const *name)
55{
56  size_t len;
57  size_t prefix_len = FILE_SYSTEM_PREFIX_LEN (name);
58
59  for (len = strlen (name);  1 < len && ISSLASH (name[len - 1]);  len--)
60    continue;
61
62  if (DOUBLE_SLASH_IS_DISTINCT_ROOT && len == 1
63      && ISSLASH (name[0]) && ISSLASH (name[1]) && ! name[2])
64    return 2;
65
66  if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len
67      && len == prefix_len && ISSLASH (name[prefix_len]))
68    return prefix_len + 1;
69
70  return len;
71}
72