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