2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2009, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure
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 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, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * See files README, COPYING and CREDITS in the root of the source
23 * tree for related information and legal notices. It is expected
24 * that future projects/authors will amend these files as needed.
28 * fnameat.c: Interpret file names relative to a directory
30 * Known contributors to this file:
31 * Markus Armbruster, 2008
37 #include "prototypes.h"
39 static int fname_is_abs(const char *);
42 * Interpret FNAME relative to directory DIR.
43 * Return FNAME if it is absolute, or DIR is null or empty.
44 * Else return a malloc'ed string containing DIR/FNAME, or null
45 * pointer when that fails.
48 fnameat(const char *fname, const char *dir)
52 if (fname_is_abs(fname) || !dir || !*dir)
55 res = malloc(strlen(dir) + 1 + strlen(fname) + 1);
59 sprintf(res, "%s/%s", dir, fname);
64 fname_is_abs(const char *fname)
67 /* Treat as absolute if it starts with '/', '\\' or a drive */
68 return fname[0] == '/' || fname[0] == '\\'
69 || (fname[0] != 0 && fname[1] == ':');
71 return fname[0] == '/';
76 * Open a stream like fopen(), optionally relative to a directory.
77 * This is exactly like fopen(), except FNAME is interpreted relative
78 * to DIR if that is neither null nor empty.
81 fopenat(const char *fname, const char *mode, const char *dir)
86 fnat = fnameat(fname, dir);
90 fp = fopen(fnat, mode);