1 /* basename.c -- return the last element in a file name
3 Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2011 Free Software
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.
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.
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/>. */
25 /* The attribute __pure__ was added in gcc 2.96. */
26 #undef _GL_ATTRIBUTE_PURE
27 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
28 # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
30 # define _GL_ATTRIBUTE_PURE /* empty */
33 /* Return the address of the last file name component of NAME. If
34 NAME has no relative file name components because it is a file
35 system root, return the empty string. */
37 char * _GL_ATTRIBUTE_PURE
38 last_component (char const *name)
40 char const *base = name + FILE_SYSTEM_PREFIX_LEN (name);
42 bool saw_slash = false;
44 while (ISSLASH (*base))
47 for (p = base; *p; p++)
61 /* Return the length of the basename NAME. Typically NAME is the
62 value returned by base_name or last_component. Act like strlen
63 (NAME), except omit all trailing slashes. */
66 base_len (char const *name)
69 size_t prefix_len = FILE_SYSTEM_PREFIX_LEN (name);
71 for (len = strlen (name); 1 < len && ISSLASH (name[len - 1]); len--)
74 if (DOUBLE_SLASH_IS_DISTINCT_ROOT && len == 1
75 && ISSLASH (name[0]) && ISSLASH (name[1]) && ! name[2])
78 if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len
79 && len == prefix_len && ISSLASH (name[prefix_len]))
80 return prefix_len + 1;