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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 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). */
size_t
dir_name_r (const char *path, const char **result)
{
char *slash;
int length; /* Length of result, not including NUL. */
slash = strrchr (path, '/');
if (BACKSLASH_IS_PATH_SEPARATOR)
{
char *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)
{
slash = memrchr (path, '/', slash - path);
if (BACKSLASH_IS_PATH_SEPARATOR)
{
char *b = memrchr (path, '\\', slash - path);
if (b && slash < b)
slash = b;
}
}
}
if (slash == 0)
{
/* File is in the current directory. */
path = ".";
length = 1;
}
else
{
/* Remove any trailing slashes from the result. */
if (BACKSLASH_IS_PATH_SEPARATOR)
{
const char *lim = ((path[0] >= 'A' && path[0] <= 'z'
&& path[1] == ':')
? path + 2 : path);
/* If canonicalized "d:/path", leave alone the root case "d:/". */
while (slash > lim && ISSLASH (*slash))
--slash;
}
else
{
while (slash > path && 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 (const char *path)
{
const char *result;
size_t length = dir_name_r (path, &result);
char *newpath = (char *) malloc (length + 1);
if (newpath == 0)
return 0;
strncpy (newpath, result, 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 *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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