1/***
2  This file is part of avahi.
3
4  avahi is free software; you can redistribute it and/or modify it
5  under the terms of the GNU Lesser General Public License as
6  published by the Free Software Foundation; either version 2.1 of the
7  License, or (at your option) any later version.
8
9  avahi is distributed in the hope that it will be useful, but WITHOUT
10  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
12  Public License for more details.
13
14  You should have received a copy of the GNU Lesser General Public
15  License along with avahi; if not, write to the Free Software
16  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
17  USA.
18***/
19
20#ifdef HAVE_CONFIG_H
21#include <config.h>
22#endif
23
24#include <assert.h>
25#include <limits.h>
26#include <stdlib.h>
27#include <errno.h>
28#include <string.h>
29
30#include "xdg-config.h"
31
32#ifndef PATH_MAX
33#define PATH_MAX 4096
34#endif
35
36FILE *avahi_xdg_config_open(const char *filename) {
37    FILE *f;
38    const char *e, *d;
39    char fn[PATH_MAX], *p = NULL, buf[2048], *s = NULL;
40
41    assert(filename);
42
43    if ((e = getenv("XDG_CONFIG_HOME")) && *e)
44        snprintf(p = fn, sizeof(fn), "%s/%s", e, filename);
45    else if ((e = getenv("HOME")) && *e)
46        snprintf(p = fn, sizeof(fn), "%s/.config/%s", e, filename);
47
48    if (p) {
49        if ((f = fopen(p, "r")))
50            return f;
51        else if (errno != ENOENT)
52            return NULL;
53    }
54
55    if (!(d = getenv("XDG_CONFIG_DIRS")) || !*d)
56        d = "/etc/xdg";
57
58    snprintf(buf, sizeof(buf), "%s", d);
59
60    for (e = strtok_r(buf, ":", &s); e; e = strtok_r(NULL, ":", &s)) {
61        snprintf(fn, sizeof(fn), "%s/%s", e, filename);
62
63        if ((f = fopen(fn, "r")))
64            return f;
65    }
66
67    return NULL;
68}
69