2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2011, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure, Markus Armbruster
6 * Empire 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 3 of the License, or
9 * (at your option) any later version.
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.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 * See files README, COPYING and CREDITS in the root of the source
22 * tree for related information and legal notices. It is expected
23 * that future projects/authors will amend these files as needed.
27 * fnameat.c: Interpret file names relative to a directory
29 * Known contributors to this file:
30 * Markus Armbruster, 2008
36 #include "prototypes.h"
38 static int fname_is_abs(const char *);
41 * Interpret FNAME relative to directory DIR.
42 * Return FNAME if it is absolute, or DIR is null or empty.
43 * Else return a malloc'ed string containing DIR/FNAME, or null
44 * pointer when that fails.
47 fnameat(const char *fname, const char *dir)
51 if (fname_is_abs(fname) || !dir || !*dir)
54 res = malloc(strlen(dir) + 1 + strlen(fname) + 1);
58 sprintf(res, "%s/%s", dir, fname);
63 fname_is_abs(const char *fname)
66 /* Treat as absolute if it starts with '/', '\\' or a drive */
67 return fname[0] == '/' || fname[0] == '\\'
68 || (fname[0] != 0 && fname[1] == ':');
70 return fname[0] == '/';
75 * Open a stream like fopen(), optionally relative to a directory.
76 * This is exactly like fopen(), except FNAME is interpreted relative
77 * to DIR if that is neither null nor empty.
80 fopenat(const char *fname, const char *mode, const char *dir)
85 fnat = fnameat(fname, dir);
89 fp = fopen(fnat, mode);