File: input.c

package info (click to toggle)
sigrok-cli 0.7.1-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 856 kB
  • sloc: sh: 4,154; ansic: 2,984; makefile: 32
file content (197 lines) | stat: -rw-r--r-- 5,428 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
/*
 * This file is part of the sigrok-cli project.
 *
 * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include "sigrok-cli.h"

#define CHUNK_SIZE (4 * 1024 * 1024)

static void load_input_file_module(void)
{
	struct sr_session *session;
	const struct sr_input *in;
	const struct sr_input_module *imod;
	const struct sr_option **options;
	struct sr_dev_inst *sdi;
	GHashTable *mod_args, *mod_opts;
	GString *buf;
	gboolean got_sdi;
	int fd;
	ssize_t len;
	char *mod_id;
	gboolean is_stdin;

	if (!sr_input_list())
		g_critical("No supported input formats available.");

	mod_id = NULL;
	mod_args = NULL;
	if (opt_input_format) {
		mod_args = parse_generic_arg(opt_input_format, TRUE);
		mod_id = g_hash_table_lookup(mod_args, "sigrok_key");
	}

	is_stdin = strcmp(opt_input_file, "-") == 0;
	fd = 0;
	buf = g_string_sized_new(CHUNK_SIZE);
	if (mod_id) {
		/* User specified an input module to use. */
		if (!(imod = sr_input_find(mod_id)))
			g_critical("Error: unknown input module '%s'.", mod_id);
		g_hash_table_remove(mod_args, "sigrok_key");
		if ((options = sr_input_options_get(imod))) {
			mod_opts = generic_arg_to_opt(options, mod_args);
			sr_output_options_free(options);
		} else
			mod_opts = NULL;
		if (!(in = sr_input_new(imod, mod_opts)))
			g_critical("Error: failed to initialize input module.");
		if (mod_opts)
			g_hash_table_destroy(mod_opts);
		if (mod_args)
			g_hash_table_destroy(mod_args);
		if (!is_stdin && (fd = open(opt_input_file, O_RDONLY)) < 0)
			g_critical("Failed to load %s: %s.", opt_input_file,
					g_strerror(errno));
	} else {
		if (!is_stdin) {
			/*
			 * An actual filename: let the input modules try to
			 * identify the file.
			 */
			if (sr_input_scan_file(opt_input_file, &in) == SR_OK) {
				/* That worked, reopen the file for reading. */
				fd = open(opt_input_file, O_RDONLY);
			}
		} else {
			/*
			 * Taking input from a pipe: let the input modules try
			 * to identify the stream content.
			 */
			if (is_stdin) {
				/* stdin */
				fd = 0;
			} else {
				fd = open(opt_input_file, O_RDONLY);
				if (fd == -1)
					g_critical("Failed to load %s: %s.", opt_input_file,
							g_strerror(errno));
			}
			if ((len = read(fd, buf->str, CHUNK_SIZE)) < 1)
				g_critical("Failed to read %s: %s.", opt_input_file,
						g_strerror(errno));
			buf->len = len;
			sr_input_scan_buffer(buf, &in);
		}
		if (!in)
			g_critical("Error: no input module found for this file.");
	}
	sr_session_new(sr_ctx, &session);
	sr_session_datafeed_callback_add(session, &datafeed_in, session);

	got_sdi = FALSE;
	while (TRUE) {
		g_string_truncate(buf, 0);
		len = read(fd, buf->str, CHUNK_SIZE);
		if (len < 0)
			g_critical("Read failed: %s", g_strerror(errno));
		if (len == 0)
			/* End of file or stream. */
			break;
		buf->len = len;
		if (sr_input_send(in, buf) != SR_OK)
			break;

		sdi = sr_input_dev_inst_get(in);
		if (!got_sdi && sdi) {
			/* First time we got a valid sdi. */
			if (select_channels(sdi) != SR_OK)
				return;
			if (sr_session_dev_add(session, sdi) != SR_OK) {
				g_critical("Failed to use device.");
				sr_session_destroy(session);
				return;
			}
			got_sdi = TRUE;
		}
	}
	sr_input_end(in);
	sr_input_free(in);
	g_string_free(buf, TRUE);

	sr_session_destroy(session);

}

void load_input_file(void)
{
	struct sr_session *session;
	struct sr_dev_inst *sdi;
	GSList *devices;
	GMainLoop *main_loop;
	int ret;

	if (!strcmp(opt_input_file, "-")) {
		/* Input from stdin is never a session file. */
		load_input_file_module();
	} else {
		if ((ret = sr_session_load(sr_ctx, opt_input_file,
				&session)) == SR_OK) {
			/* sigrok session file */
			ret = sr_session_dev_list(session, &devices);
			if (ret != SR_OK || !devices || !devices->data) {
				g_critical("Failed to access session device.");
				g_slist_free(devices);
				sr_session_destroy(session);
				return;
			}
			sdi = devices->data;
			g_slist_free(devices);
			if (select_channels(sdi) != SR_OK) {
				sr_session_destroy(session);
				return;
			}
			main_loop = g_main_loop_new(NULL, FALSE);

			sr_session_datafeed_callback_add(session, datafeed_in, session);
			sr_session_stopped_callback_set(session,
				(sr_session_stopped_callback)g_main_loop_quit,
				main_loop);
			if (sr_session_start(session) == SR_OK)
				g_main_loop_run(main_loop);

			g_main_loop_unref(main_loop);
			sr_session_destroy(session);
		} else if (ret != SR_ERR) {
			/* It's a session file, but it didn't work out somehow. */
			g_critical("Failed to load session file.");
		} else {
			/* Fall back on input modules. */
			load_input_file_module();
		}
	}
}