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106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/* dirname.c -- return all but the last element in a path
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Copyright 1990, 1998, 2000, 2001 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#if STDC_HEADERS || HAVE_STRING_H
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# include <string.h>
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#endif
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#include "dirname.h"
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#include "xalloc.h"
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/* Return the length of `dirname (PATH)', or zero if PATH is
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in the working directory. Works properly even if
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there are trailing slashes (by effectively ignoring them). */
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size_t
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dir_len (char const *path)
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{
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size_t prefix_length = FILESYSTEM_PREFIX_LEN (path);
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size_t length;
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/* Strip the basename and any redundant slashes before it. */
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for (length = base_name (path) - path; prefix_length < length; length--)
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if (! ISSLASH (path[length - 1]))
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return length;
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/* But don't strip the only slash from "/". */
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return prefix_length + ISSLASH (path[prefix_length]);
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}
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/* Return the leading directories part of PATH,
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allocated with xmalloc.
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Works properly even if there are trailing slashes
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(by effectively ignoring them). */
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char *
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dir_name (char const *path)
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{
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size_t length = dir_len (path);
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int append_dot = (length == FILESYSTEM_PREFIX_LEN (path));
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char *newpath = xmalloc (length + append_dot + 1);
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memcpy (newpath, path, length);
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if (append_dot)
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newpath[length++] = '.';
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newpath[length] = 0;
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return newpath;
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}
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#ifdef TEST_DIRNAME
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/*
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Run the test like this (expect no output):
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gcc -DHAVE_CONFIG_H -DTEST_DIRNAME -I.. -O -Wall \
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basename.c dirname.c xmalloc.c
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sed -n '/^BEGIN-DATA$/,/^END-DATA$/p' dirname.c|grep -v DATA|./a.out
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BEGIN-DATA
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foo//// .
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bar/foo//// bar
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foo/ .
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/ /
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. .
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a .
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END-DATA
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*/
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# define MAX_BUFF_LEN 1024
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# include <stdio.h>
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int
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main ()
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{
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char buff[MAX_BUFF_LEN + 1];
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buff[MAX_BUFF_LEN] = 0;
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while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
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{
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char path[MAX_BUFF_LEN];
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char expected_result[MAX_BUFF_LEN];
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char const *result;
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sscanf (buff, "%s %s", path, expected_result);
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result = dir_name (path);
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if (strcmp (result, expected_result))
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printf ("%s: got %s, expected %s\n", path, result, expected_result);
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}
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return 0;
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}
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#endif
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