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/* dirname.c -- return all but the last element in a path
Copyright 1990, 1998, 2000, 2001 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 2, 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, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#if HAVE_CONFIG_H
# include <config.h>
#endif
#if STDC_HEADERS || HAVE_STRING_H
# include <string.h>
#endif
#include "dirname.h"
#include "xalloc.h"
/* Return the length of `dirname (PATH)', or zero if PATH is
in the working directory. Works properly even if
there are trailing slashes (by effectively ignoring them). */
size_t
dir_len (char const *path)
{
size_t prefix_length = FILESYSTEM_PREFIX_LEN (path);
size_t length;
/* Strip the basename and any redundant slashes before it. */
for (length = base_name (path) - path; prefix_length < length; length--)
if (! ISSLASH (path[length - 1]))
return length;
/* But don't strip the only slash from "/". */
return prefix_length + ISSLASH (path[prefix_length]);
}
/* Return the leading directories part of PATH,
allocated with xmalloc.
Works properly even if there are trailing slashes
(by effectively ignoring them). */
char *
dir_name (char const *path)
{
size_t length = dir_len (path);
int append_dot = (length == FILESYSTEM_PREFIX_LEN (path));
char *newpath = xmalloc (length + append_dot + 1);
memcpy (newpath, path, length);
if (append_dot)
newpath[length++] = '.';
newpath[length] = 0;
return newpath;
}
#ifdef TEST_DIRNAME
/*
Run the test like this (expect no output):
gcc -DHAVE_CONFIG_H -DTEST_DIRNAME -I.. -O -Wall \
basename.c dirname.c xmalloc.c
sed -n '/^BEGIN-DATA$/,/^END-DATA$/p' dirname.c|grep -v DATA|./a.out
BEGIN-DATA
foo//// .
bar/foo//// bar
foo/ .
/ /
. .
a .
END-DATA
*/
# define MAX_BUFF_LEN 1024
# include <stdio.h>
int
main ()
{
char buff[MAX_BUFF_LEN + 1];
buff[MAX_BUFF_LEN] = 0;
while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
{
char path[MAX_BUFF_LEN];
char expected_result[MAX_BUFF_LEN];
char const *result;
sscanf (buff, "%s %s", path, expected_result);
result = dir_name (path);
if (strcmp (result, expected_result))
printf ("%s: got %s, expected %s\n", path, result, expected_result);
}
return 0;
}
#endif
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