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/* basename.c -- return the last element in a file name
Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2020 Free Software
Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include "dirname.h"
#include <string.h>
#include "xalloc.h"
#include "xstrndup.h"
char *
base_name (char const *name)
{
char const *base = last_component (name);
size_t length;
/* If there is no last component, then name is a file system root or the
empty string. */
if (! *base)
return xstrndup (name, base_len (name));
/* Collapse a sequence of trailing slashes into one. */
length = base_len (base);
if (ISSLASH (base[length]))
length++;
/* On systems with drive letters, "a/b:c" must return "./b:c" rather
than "b:c" to avoid confusion with a drive letter. On systems
with pure POSIX semantics, this is not an issue. */
if (FILE_SYSTEM_PREFIX_LEN (base))
{
char *p = xmalloc (length + 3);
p[0] = '.';
p[1] = '/';
memcpy (p + 2, base, length);
p[length + 2] = '\0';
return p;
}
/* Finally, copy the basename. */
return xstrndup (base, length);
}
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