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 "sigrok-cli.h"
  21 #include "config.h"
  22 #include <sys/stat.h>
  23 #include <errno.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <glib.h>
  27
  28 extern gchar *opt_input_file;
  29 extern gchar *opt_input_format;
  30 extern gchar *opt_channels;
  31
  32
  33 /**
  34  * Return the input file format which the CLI tool should use.
  35  *
  36  * If the user specified -I / --input-format, use that one. Otherwise, try to
  37  * autodetect the format as good as possible. Failing that, return NULL.
  38  *
  39  * @param filename The filename of the input file. Must not be NULL.
  40  * @param opt The -I / --input-file option the user specified (or NULL).
  41  *
  42  * @return A pointer to the 'struct sr_input_format' that should be used,
  43  *         or NULL if no input format was selected or auto-detected.
  44  */
  45 static struct sr_input_format *determine_input_file_format(
  46                         const char *filename, const char *opt)
  47 {
  48         int i;
  49         struct sr_input_format **inputs;
  50
  51         /* If there are no input formats, return NULL right away. */
  52         inputs = sr_input_list();
  53         if (!inputs) {
  54                 g_critical("No supported input formats available.");
  55                 return NULL;
  56         }
  57
  58         /* If the user specified -I / --input-format, use that one. */
  59         if (opt) {
  60                 for (i = 0; inputs[i]; i++) {
  61                         if (strcasecmp(inputs[i]->id, opt))
  62                                 continue;
  63                         g_debug("Using user-specified input file format '%s'.",
  64                                         inputs[i]->id);
  65                         return inputs[i];
  66                 }
  67
  68                 /* The user specified an unknown input format, return NULL. */
  69                 g_critical("Error: specified input file format '%s' is "
  70                         "unknown.", opt);
  71                 return NULL;
  72         }
  73
  74         /* Otherwise, try to find an input module that can handle this file. */
  75         for (i = 0; inputs[i]; i++) {
  76                 if (inputs[i]->format_match(filename))
  77                         break;
  78         }
  79
  80         /* Return NULL if no input module wanted to touch this. */
  81         if (!inputs[i]) {
  82                 g_critical("Error: no matching input module found.");
  83                 return NULL;
  84         }
  85
  86         g_debug("cli: Autodetected '%s' input format for file '%s'.",
  87                 inputs[i]->id, filename);
  88
  89         return inputs[i];
  90 }
  91
  92 static void load_input_file_format(void)
  93 {
  94         GHashTable *fmtargs = NULL;
  95         struct stat st;
  96         struct sr_input *in;
  97         struct sr_input_format *input_format;
  98         char *fmtspec = NULL;
  99
 100         if (opt_input_format) {
 101                 fmtargs = parse_generic_arg(opt_input_format, TRUE);
 102                 fmtspec = g_hash_table_lookup(fmtargs, "sigrok_key");
 103         }
 104
 105         if (!(input_format = determine_input_file_format(opt_input_file,
 106                                                    fmtspec))) {
 107                 /* The exact cause was already logged. */
 108                 return;
 109         }
 110
 111         if (fmtargs)
 112                 g_hash_table_remove(fmtargs, "sigrok_key");
 113
 114         if (stat(opt_input_file, &st) == -1) {
 115                 g_critical("Failed to load %s: %s", opt_input_file,
 116                         strerror(errno));
 117                 exit(1);
 118         }
 119
 120         /* Initialize the input module. */
 121         if (!(in = g_try_malloc(sizeof(struct sr_input)))) {
 122                 g_critical("Failed to allocate input module.");
 123                 exit(1);
 124         }
 125         in->format = input_format;
 126         in->param = fmtargs;
 127         if (in->format->init) {
 128                 if (in->format->init(in, opt_input_file) != SR_OK) {
 129                         g_critical("Input format init failed.");
 130                         exit(1);
 131                 }
 132         }
 133
 134         if (select_channels(in->sdi) != SR_OK)
 135                 return;
 136
 137         sr_session_new();
 138         sr_session_datafeed_callback_add(datafeed_in, NULL);
 139         if (sr_session_dev_add(in->sdi) != SR_OK) {
 140                 g_critical("Failed to use device.");
 141                 sr_session_destroy();
 142                 return;
 143         }
 144
 145         input_format->loadfile(in, opt_input_file);
 146
 147         sr_session_destroy();
 148
 149         if (fmtargs)
 150                 g_hash_table_destroy(fmtargs);
 151 }
 152
 153 void load_input_file(void)
 154 {
 155         GSList *sessions;
 156         struct sr_dev_inst *sdi;
 157         int ret;
 158
 159         if (sr_session_load(opt_input_file) == SR_OK) {
 160                 /* sigrok session file */
 161                 ret = sr_session_dev_list(&sessions);
 162                 if (ret != SR_OK || !sessions->data) {
 163                         g_critical("Failed to access session device.");
 164                         sr_session_destroy();
 165                         return;
 166                 }
 167                 sdi = sessions->data;
 168                 if (select_channels(sdi) != SR_OK) {
 169                         sr_session_destroy();
 170                         return;
 171                 }
 172                 sr_session_datafeed_callback_add(datafeed_in, NULL);
 173                 sr_session_start();
 174                 sr_session_run();
 175                 sr_session_stop();
 176         }
 177         else {
 178                 /* fall back on input modules */
 179                 load_input_file_format();
 180         }
 181 }