path: root/src/utils.c

/*
 * Copyright (C) 2003-2011 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"
#include "utils.h"
#include "glib_compat.h"
#include "conf.h"

#include <glib.h>

#include <assert.h>
#include <string.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>

#ifndef WIN32
#include <pwd.h>
#endif

#ifdef HAVE_IPV6
#include <sys/socket.h>
#endif

#ifdef WIN32
#include <windows.h>
#endif

G_GNUC_CONST
static inline GQuark
parse_path_quark(void)
{
	return g_quark_from_static_string("path");
}

char *
parsePath(const char *path, G_GNUC_UNUSED GError **error_r)
{
	assert(path != NULL);
	assert(error_r == NULL || *error_r == NULL);

#ifndef WIN32
	if (!g_path_is_absolute(path) && path[0] != '~') {
		g_set_error(error_r, parse_path_quark(), 0,
			    "not an absolute path: %s", path);
		return NULL;
	} else if (path[0] == '~') {
		const char *home;

		if (path[1] == '/' || path[1] == '\0') {
			const char *user = config_get_string(CONF_USER, NULL);
			if (user != NULL) {
				struct passwd *passwd = getpwnam(user);
				if (!passwd) {
					g_set_error(error_r, parse_path_quark(), 0,
						    "no such user: %s", user);
					return NULL;
				}

				home = passwd->pw_dir;
			} else {
				home = g_get_home_dir();
				if (home == NULL) {
					g_set_error_literal(error_r, parse_path_quark(), 0,
							    "problems getting home "
							    "for current user");
					return NULL;
				}
			}

			++path;
		} else {
			++path;

			const char *slash = strchr(path, '/');
			char *user = slash != NULL
				? g_strndup(path, slash - path)
				: g_strdup(path);

			struct passwd *passwd = getpwnam(user);
			if (!passwd) {
				g_set_error(error_r, parse_path_quark(), 0,
					    "no such user: %s", user);
				g_free(user);
				return NULL;
			}

			g_free(user);

			home = passwd->pw_dir;
			path = slash;
		}

		return g_strconcat(home, path, NULL);
	} else {
#endif
		return g_strdup(path);
#ifndef WIN32
	}
#endif
}