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 
29 char *
last_component(char const * name)30 last_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 
57 size_t
base_len(char const * name)58 base_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