1/* dirname.c -- return all but the last element in a file name
2
3   Copyright (C) 1990, 1998, 2000, 2001, 2003, 2004, 2005 Free Software
4   Foundation, Inc.
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2, or (at your option)
9   any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program; if not, write to the Free Software Foundation,
18   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
19#include <sys/cdefs.h>
20__RCSID("$NetBSD: dirname.c,v 1.2 2016/05/17 14:00:09 christos Exp $");
21
22
23#ifdef HAVE_CONFIG_H
24# include <config.h>
25#endif
26
27#include "dirname.h"
28
29#include <string.h>
30#include "xalloc.h"
31
32/* Return the length of `dirname (FILE)', or zero if FILE is
33   in the working directory.  Works properly even if
34   there are trailing slashes (by effectively ignoring them).  */
35size_t
36dir_len (char const *file)
37{
38  size_t prefix_length = FILE_SYSTEM_PREFIX_LEN (file);
39  size_t length;
40
41  /* Strip the basename and any redundant slashes before it.  */
42  for (length = base_name (file) - file;  prefix_length < length;  length--)
43    if (! ISSLASH (file[length - 1]))
44      return length;
45
46  /* But don't strip the only slash from "/".  */
47  return prefix_length + ISSLASH (file[prefix_length]);
48}
49
50/* Return the leading directories part of FILE,
51   allocated with xmalloc.
52   Works properly even if there are trailing slashes
53   (by effectively ignoring them).  */
54
55char *
56dir_name (char const *file)
57{
58  size_t length = dir_len (file);
59  bool append_dot = (length == FILE_SYSTEM_PREFIX_LEN (file));
60  char *dir = xmalloc (length + append_dot + 1);
61  memcpy (dir, file, length);
62  if (append_dot)
63    dir[length++] = '.';
64  dir[length] = 0;
65  return dir;
66}
67
68#ifdef TEST_DIRNAME
69/*
70
71Run the test like this (expect no output):
72  gcc -DHAVE_CONFIG_H -DTEST_DIRNAME -I.. -O -Wall \
73     basename.c dirname.c xmalloc.c error.c
74  sed -n '/^BEGIN-DATA$/,/^END-DATA$/p' dirname.c|grep -v DATA|./a.out
75
76If it's been built on a DOS or Windows platforms, run another test like
77this (again, expect no output):
78  sed -n '/^BEGIN-DOS-DATA$/,/^END-DOS-DATA$/p' dirname.c|grep -v DATA|./a.out
79
80BEGIN-DATA
81foo//// .
82bar/foo//// bar
83foo/ .
84/ /
85. .
86a .
87END-DATA
88
89BEGIN-DOS-DATA
90c:///// c:/
91c:/ c:/
92c:/. c:/
93c:foo c:.
94c:foo/bar c:foo
95END-DOS-DATA
96
97*/
98
99# define MAX_BUFF_LEN 1024
100# include <stdio.h>
101
102char *program_name;
103
104int
105main (int argc, char *argv[])
106{
107  char buff[MAX_BUFF_LEN + 1];
108
109  program_name = argv[0];
110
111  buff[MAX_BUFF_LEN] = 0;
112  while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
113    {
114      char file[MAX_BUFF_LEN];
115      char expected_result[MAX_BUFF_LEN];
116      char const *result;
117      sscanf (buff, "%s %s", file, expected_result);
118      result = dir_name (file);
119      if (strcmp (result, expected_result))
120	printf ("%s: got %s, expected %s\n", file, result, expected_result);
121    }
122  return 0;
123}
124#endif
125