input.c

   1 /*
   2  * This file is part of the sigrok-cli project.
   3  *
   4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   5  *
   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 3 of the License, or
   9  * (at your option) any later version.
  10  *
  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.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <sys/types.h>
  22 #include <sys/stat.h>
  23 #include <fcntl.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <glib.h>
  29 #include "sigrok-cli.h"
  30
  31 #define CHUNK_SIZE (4 * 1024 * 1024)
  32
  33 static void load_input_file_module(void)
  34 {
  35         struct sr_session *session;
  36         const struct sr_input *in;
  37         const struct sr_input_module *imod;
  38         const struct sr_option **options;
  39         struct sr_dev_inst *sdi;
  40         GHashTable *mod_args, *mod_opts;
  41         GString *buf;
  42         gboolean got_sdi;
  43         int fd;
  44         ssize_t len;
  45         char *mod_id;
  46         gboolean is_stdin;
  47
  48         if (!sr_input_list())
  49                 g_critical("No supported input formats available.");
  50
  51         mod_id = NULL;
  52         mod_args = NULL;
  53         if (opt_input_format) {
  54                 mod_args = parse_generic_arg(opt_input_format, TRUE);
  55                 mod_id = g_hash_table_lookup(mod_args, "sigrok_key");
  56         }
  57
  58         is_stdin = strcmp(opt_input_file, "-") == 0;
  59         fd = 0;
  60         buf = g_string_sized_new(CHUNK_SIZE);
  61         if (mod_id) {
  62                 /* User specified an input module to use. */
  63                 if (!(imod = sr_input_find(mod_id)))
  64                         g_critical("Error: unknown input module '%s'.", mod_id);
  65                 g_hash_table_remove(mod_args, "sigrok_key");
  66                 if ((options = sr_input_options_get(imod))) {
  67                         mod_opts = generic_arg_to_opt(options, mod_args);
  68                         sr_output_options_free(options);
  69                 } else
  70                         mod_opts = NULL;
  71                 if (!(in = sr_input_new(imod, mod_opts)))
  72                         g_critical("Error: failed to initialize input module.");
  73                 if (mod_opts)
  74                         g_hash_table_destroy(mod_opts);
  75                 if (mod_args)
  76                         g_hash_table_destroy(mod_args);
  77                 if (!is_stdin && (fd = open(opt_input_file, O_RDONLY)) < 0)
  78                         g_critical("Failed to load %s: %s.", opt_input_file,
  79                                         g_strerror(errno));
  80         } else {
  81                 if (!is_stdin) {
  82                         /*
  83                          * An actual filename: let the input modules try to
  84                          * identify the file.
  85                          */
  86                         if (sr_input_scan_file(opt_input_file, &in) == SR_OK) {
  87                                 /* That worked, reopen the file for reading. */
  88                                 fd = open(opt_input_file, O_RDONLY);
  89                         }
  90                 } else {
  91                         /*
  92                          * Taking input from a pipe: let the input modules try
  93                          * to identify the stream content.
  94                          */
  95                         if (is_stdin) {
  96                                 /* stdin */
  97                                 fd = 0;
  98                         } else {
  99                                 fd = open(opt_input_file, O_RDONLY);
 100                                 if (fd == -1)
 101                                         g_critical("Failed to load %s: %s.", opt_input_file,
 102                                                         g_strerror(errno));
 103                         }
 104                         if ((len = read(fd, buf->str, CHUNK_SIZE)) < 1)
 105                                 g_critical("Failed to read %s: %s.", opt_input_file,
 106                                                 g_strerror(errno));
 107                         buf->len = len;
 108                         sr_input_scan_buffer(buf, &in);
 109                 }
 110                 if (!in)
 111                         g_critical("Error: no input module found for this file.");
 112         }
 113         sr_session_new(sr_ctx, &session);
 114         sr_session_datafeed_callback_add(session, &datafeed_in, session);
 115
 116         got_sdi = FALSE;
 117         while (TRUE) {
 118                 g_string_truncate(buf, 0);
 119                 len = read(fd, buf->str, CHUNK_SIZE);
 120                 if (len < 0)
 121                         g_critical("Read failed: %s", g_strerror(errno));
 122                 if (len == 0)
 123                         /* End of file or stream. */
 124                         break;
 125                 buf->len = len;
 126                 if (sr_input_send(in, buf) != SR_OK)
 127                         break;
 128
 129                 sdi = sr_input_dev_inst_get(in);
 130                 if (!got_sdi && sdi) {
 131                         /* First time we got a valid sdi. */
 132                         if (select_channels(sdi) != SR_OK)
 133                                 return;
 134                         if (sr_session_dev_add(session, sdi) != SR_OK) {
 135                                 g_critical("Failed to use device.");
 136                                 sr_session_destroy(session);
 137                                 return;
 138                         }
 139                         got_sdi = TRUE;
 140                 }
 141         }
 142         sr_input_end(in);
 143         sr_input_free(in);
 144         g_string_free(buf, TRUE);
 145
 146         sr_session_destroy(session);
 147
 148 }
 149
 150 void load_input_file(void)
 151 {
 152         struct sr_session *session;
 153         struct sr_dev_inst *sdi;
 154         GSList *devices;
 155         GMainLoop *main_loop;
 156         int ret;
 157
 158         if (!strcmp(opt_input_file, "-")) {
 159                 /* Input from stdin is never a session file. */
 160                 load_input_file_module();
 161         } else {
 162                 if ((ret = sr_session_load(sr_ctx, opt_input_file,
 163                                 &session)) == SR_OK) {
 164                         /* sigrok session file */
 165                         ret = sr_session_dev_list(session, &devices);
 166                         if (ret != SR_OK || !devices || !devices->data) {
 167                                 g_critical("Failed to access session device.");
 168                                 g_slist_free(devices);
 169                                 sr_session_destroy(session);
 170                                 return;
 171                         }
 172                         sdi = devices->data;
 173                         g_slist_free(devices);
 174                         if (select_channels(sdi) != SR_OK) {
 175                                 sr_session_destroy(session);
 176                                 return;
 177                         }
 178                         main_loop = g_main_loop_new(NULL, FALSE);
 179
 180                         sr_session_datafeed_callback_add(session, datafeed_in, session);
 181                         sr_session_stopped_callback_set(session,
 182                                 (sr_session_stopped_callback)g_main_loop_quit,
 183                                 main_loop);
 184                         if (sr_session_start(session) == SR_OK)
 185                                 g_main_loop_run(main_loop);
 186
 187                         g_main_loop_unref(main_loop);
 188                         sr_session_destroy(session);
 189                 } else if (ret != SR_ERR) {
 190                         /* It's a session file, but it didn't work out somehow. */
 191                         g_critical("Failed to load session file.");
 192                 } else {
 193                         /* Fall back on input modules. */
 194                         load_input_file_module();
 195                 }
 196         }
 197 }