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/* dirname.c -- return all but the last element in a path
Copyright (C) 1990, 1998, 2000 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
#ifdef STDC_HEADERS
# include <stdlib.h>
#else
char *malloc ();
#endif
#if defined STDC_HEADERS || defined HAVE_STRING_H
# include <string.h>
#else
# include <strings.h>
# ifndef strrchr
# define strrchr rindex
# endif
#endif
#include <assert.h>
#ifndef HAVE_DECL_MEMRCHR
"this configure-time declaration test was not run"
#endif
#if !HAVE_DECL_MEMRCHR
void *memrchr ();
#endif
#include "dirname.h"
#ifndef FILESYSTEM_PREFIX_LEN
# define FILESYSTEM_PREFIX_LEN(Filename) 0
#endif
#ifndef ISSLASH
# define ISSLASH(C) ((C) == '/')
#endif
#define BACKSLASH_IS_PATH_SEPARATOR ISSLASH ('\\')
/* Return the length of `dirname (PATH)' and set *RESULT to point
to PATH or to `"."', as appropriate. Works properly even if
there are trailing slashes (by effectively ignoring them).
WARNING: This function doesn't work for cwd-relative names like
`a:foo' that are specified with a drive-letter prefix. That case
is handled in the caller. */
static size_t
dir_name_r (char const *path, char const **result)
{
char const *slash;
size_t length; /* Length of result, not including NUL. */
slash = strrchr (path, '/');
if (BACKSLASH_IS_PATH_SEPARATOR)
{
char const *b = strrchr (path, '\\');
if (b && slash < b)
slash = b;
}
/* If the last byte of PATH is a slash, decrement SLASH until it's
pointing at the leftmost in a sequence of trailing slashes. */
if (slash && slash[1] == 0)
{
while (path < slash && ISSLASH (slash[-1]))
{
--slash;
}
if (path < slash)
{
size_t len = slash - path;
slash = memrchr (path, '/', len);
if (BACKSLASH_IS_PATH_SEPARATOR)
{
char const *b = memrchr (path, '\\', len);
if (b && slash < b)
slash = b;
}
}
}
if (slash == 0)
{
/* File is in the current directory. */
length = FILESYSTEM_PREFIX_LEN (path);
if (length == 0)
{
path = ".";
length = 1;
}
}
else
{
/* Remove any trailing slashes from the result. If we have a
canonicalized "d:/path", leave alone the root case "d:/". */
char const *lim = path + FILESYSTEM_PREFIX_LEN (path);
while (lim < slash && ISSLASH (*slash))
--slash;
length = slash - path + 1;
}
*result = path;
return length;
}
/* Return the leading directories part of PATH,
allocated with malloc. If out of memory, return 0.
Works properly even if there are trailing slashes
(by effectively ignoring them). */
char *
dir_name (char const *path)
{
char const *result;
size_t length = dir_name_r (path, &result);
int append_dot = (length && length == FILESYSTEM_PREFIX_LEN (newpath));
char *newpath = (char *) malloc (length + append_dot + 1);
if (newpath == 0)
return 0;
strncpy (newpath, result, length);
/* If PATH is "d:foo", return "d:.", the CWD on drive d: */
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 memrchr.c dirname.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>
# include <stdlib.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);
}
exit (0);
}
#endif
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