1 /* path-concat.c -- concatenate two arbitrary pathnames
2 Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Written by Jim Meyering. */
25 # define mempcpy(D, S, N) ((void *) ((char *) memcpy (D, S, N) + (N)))
32 #include <sys/types.h>
37 #ifndef DIRECTORY_SEPARATOR
38 # define DIRECTORY_SEPARATOR '/'
42 # define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR)
46 #include "path-concat.h"
48 /* Concatenate two pathname components, DIR and BASE, in
49 newly-allocated storage and return the result. Return 0 if out of
50 memory. Add a slash between DIR and BASE in the result if neither
51 would contribute one. If each would contribute at least one, elide
52 one from the end of DIR. Otherwise, simply concatenate DIR and
53 BASE. In any case, if BASE_IN_RESULT is non-NULL, set
54 *BASE_IN_RESULT to point to the copy of BASE in the returned
57 DIR may be NULL, BASE must not be.
59 Return NULL if memory is exhausted. */
62 path_concat (const char *dir, const char *base, char **base_in_result)
71 p_concat = strdup (base);
73 *base_in_result = p_concat;
77 /* DIR is not empty. */
78 base_len = strlen (base);
79 dir_len = strlen (dir);
81 p_concat = malloc (dir_len + base_len + 2);
85 p = mempcpy (p_concat, dir, dir_len);
87 if (ISSLASH (*(p - 1)) && ISSLASH(*base))
89 else if (!ISSLASH (*(p - 1)) && !ISSLASH(*base))
90 *p++ = DIRECTORY_SEPARATOR;
95 memcpy (p, base, base_len + 1);
100 /* Same, but die when memory is exhausted. */
103 xpath_concat (const char *dir, const char *base, char **base_in_result)
105 char *res = path_concat (dir, base, base_in_result);