1/***************************************************************************
2 * CVSID: $Id$
3 *
4 * hal_find_by_capability.c : Find hal devices
5 *
6 * Copyright (C) 2005 David Zeuthen, <david@fubar.dk>
7 *
8 * Licensed under the Academic Free License version 2.1
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
23 *
24 **************************************************************************/
25
26
27#ifdef HAVE_CONFIG_H
28#  include <config.h>
29#endif
30
31#include <stdio.h>
32#include <string.h>
33#include <unistd.h>
34#include <getopt.h>
35
36#include <libhal.h>
37
38
39/** Print out program usage.
40 *
41 *  @param  argc                Number of arguments given to program
42 *  @param  argv                Arguments given to program
43 */
44static void
45usage (int argc, char *argv[])
46{
47	fprintf (stderr,
48 "\n"
49 "usage : hal-find-by-capability --capability <capability>\n"
50 "                              [--help] [--verbose] [--version]\n");
51	fprintf (stderr,
52 "\n"
53 "        --capability     HAL Device Capability to search for\n"
54 "        --verbose        Be verbose\n"
55 "        --version        Show version and exit\n"
56 "        --help           Show this information and exit\n"
57 "\n"
58 "This program prints the Unique Device Identifiers for HAL device\n"
59 "objects of a given capability on stdout and exits with exit code 0\n"
60 "If there is an error, the program exits with an exit code different\n"
61 "from 0.\n"
62 "\n");
63}
64
65/** Entry point
66 *
67 *  @param  argc                Number of arguments given to program
68 *  @param  argv                Arguments given to program
69 *  @return                     Return code
70 */
71int
72main (int argc, char *argv[])
73{
74	int i;
75	int num_udis;
76	char **udis;
77	char *capability = NULL;
78	dbus_bool_t is_verbose = FALSE;
79	dbus_bool_t is_version = FALSE;
80	DBusError error;
81	LibHalContext *hal_ctx;
82
83	if (argc <= 1) {
84		usage (argc, argv);
85		return 1;
86	}
87
88	while (1) {
89		int c;
90		int option_index = 0;
91		const char *opt;
92		static struct option long_options[] = {
93			{"capability", 1, NULL, 0},
94			{"verbose", 0, NULL, 0},
95			{"version", 0, NULL, 0},
96			{"help", 0, NULL, 0},
97			{NULL, 0, NULL, 0}
98		};
99
100		c = getopt_long (argc, argv, "",
101				 long_options, &option_index);
102		if (c == -1)
103			break;
104
105		switch (c) {
106		case 0:
107			opt = long_options[option_index].name;
108
109			if (strcmp (opt, "help") == 0) {
110				usage (argc, argv);
111				return 0;
112			} else if (strcmp (opt, "verbose") == 0) {
113				is_verbose = TRUE;
114			} else if (strcmp (opt, "version") == 0) {
115				is_version = TRUE;
116			} else if (strcmp (opt, "capability") == 0) {
117				capability = strdup (optarg);
118			}
119			break;
120
121		default:
122			usage (argc, argv);
123			return 1;
124			break;
125		}
126	}
127
128	if (is_version) {
129		printf ("hal-find-by-capability " PACKAGE_VERSION "\n");
130		return 0;
131	}
132
133	if (capability == NULL) {
134		usage (argc, argv);
135		return 1;
136	}
137
138	dbus_error_init (&error);
139	if ((hal_ctx = libhal_ctx_new ()) == NULL) {
140		fprintf (stderr, "error: libhal_ctx_new\n");
141		LIBHAL_FREE_DBUS_ERROR (&error);
142		return 1;
143	}
144	if (!libhal_ctx_set_dbus_connection (hal_ctx, dbus_bus_get (DBUS_BUS_SYSTEM, &error))) {
145		fprintf (stderr, "error: libhal_ctx_set_dbus_connection: %s: %s\n", error.name, error.message);
146		LIBHAL_FREE_DBUS_ERROR (&error);
147		return 1;
148	}
149	if (!libhal_ctx_init (hal_ctx, &error)) {
150		if (dbus_error_is_set(&error)) {
151			fprintf (stderr, "error: libhal_ctx_init: %s: %s\n", error.name, error.message);
152			LIBHAL_FREE_DBUS_ERROR (&error);
153		}
154		fprintf (stderr, "Could not initialise connection to hald.\n"
155				 "Normally this means the HAL daemon (hald) is not running or not ready.\n");
156		return 1;
157	}
158
159
160	udis = libhal_find_device_by_capability (hal_ctx, capability, &num_udis, &error);
161
162	if (dbus_error_is_set (&error)) {
163		fprintf (stderr, "error: %s: %s\n", error.name, error.message);
164		LIBHAL_FREE_DBUS_ERROR (&error);
165		return 1;
166	}
167
168	if (is_verbose)
169		printf ("Found %d device objects of capability '%s'\n", num_udis, capability);
170
171	if (num_udis == 0) {
172		return 1;
173	}
174
175	for (i = 0; i < num_udis; i++) {
176		printf ("%s\n", udis[i]);
177	}
178
179	libhal_free_string_array (udis);
180
181	return 0;
182}
183
184/**
185 * @}
186 */
187