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 <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24 #include <errno.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <glib.h>
  28 #include "sigrok-cli.h"
  29 #include "config.h"
  30
  31 #define BUFSIZE (16 * 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
  47         if (!sr_input_list())
  48                 g_critical("No supported input formats available.");
  49
  50         mod_id = NULL;
  51         mod_args = NULL;
  52         if (opt_input_format) {
  53                 mod_args = parse_generic_arg(opt_input_format, TRUE);
  54                 mod_id = g_hash_table_lookup(mod_args, "sigrok_key");
  55         }
  56
  57         fd = 0;
  58         buf = g_string_sized_new(BUFSIZE);
  59         if (mod_id) {
  60                 /* User specified an input module to use. */
  61                 if (!(imod = sr_input_find(mod_id)))
  62                         g_critical("Error: unknown input module '%s'.", mod_id);
  63                 g_hash_table_remove(mod_args, "sigrok_key");
  64                 if ((options = sr_input_options_get(imod))) {
  65                         mod_opts = generic_arg_to_opt(options, mod_args);
  66                         sr_output_options_free(options);
  67                 } else
  68                         mod_opts = NULL;
  69                 if (!(in = sr_input_new(imod, mod_opts)))
  70                         g_critical("Error: failed to initialize input module.");
  71                 if (mod_opts)
  72                         g_hash_table_destroy(mod_opts);
  73                 if (mod_args)
  74                         g_hash_table_destroy(mod_args);
  75                 if ((fd = open(opt_input_file, O_RDONLY)) == -1)
  76                         g_critical("Failed to load %s: %s.", opt_input_file,
  77                                         strerror(errno));
  78         } else {
  79                 if (strcmp(opt_input_file, "-")) {
  80                         /*
  81                          * An actual filename: let the input modules try to
  82                          * identify the file.
  83                          */
  84                         if (sr_input_scan_file(opt_input_file, &in) == SR_OK) {
  85                                 /* That worked, reopen the file for reading. */
  86                                 fd = open(opt_input_file, O_RDONLY);
  87                         }
  88                 } else {
  89                         /*
  90                          * Taking input from a pipe: let the input modules try
  91                          * to identify the stream content.
  92                          */
  93                         if (!strcmp(opt_input_file, "-")) {
  94                                 /* stdin */
  95                                 fd = 0;
  96                         } else {
  97                                 if ((fd = open(opt_input_file, O_RDONLY)) == -1)
  98                                         g_critical("Failed to load %s: %s.", opt_input_file,
  99                                                         strerror(errno));
 100                         }
 101                         if ((len = read(fd, buf->str, BUFSIZE)) < 1)
 102                                 g_critical("Failed to read %s: %s.", opt_input_file,
 103                                                 strerror(errno));
 104                         buf->len = len;
 105                         sr_input_scan_buffer(buf, &in);
 106                 }
 107                 if (!in)
 108                         g_critical("Error: no input module found for this file.");
 109         }
 110         sr_session_new(sr_ctx, &session);
 111         sr_session_datafeed_callback_add(session, &datafeed_in, NULL);
 112
 113         got_sdi = FALSE;
 114         while (TRUE) {
 115                 g_string_truncate(buf, 0);
 116                 len = read(fd, buf->str, BUFSIZE);
 117                 if (len < 0)
 118                         g_critical("Read failed: %s", strerror(errno));
 119                 if (len == 0)
 120                         /* End of file or stream. */
 121                         break;
 122                 buf->len = len;
 123                 if (sr_input_send(in, buf) != SR_OK)
 124                         break;
 125
 126                 sdi = sr_input_dev_inst_get(in);
 127                 if (!got_sdi && sdi) {
 128                         /* First time we got a valid sdi. */
 129                         if (select_channels(sdi) != SR_OK)
 130                                 return;
 131                         if (sr_session_dev_add(session, sdi) != SR_OK) {
 132                                 g_critical("Failed to use device.");
 133                                 sr_session_destroy(session);
 134                                 return;
 135                         }
 136                         got_sdi = TRUE;
 137                 }
 138         }
 139         sr_input_end(in);
 140         sr_input_free(in);
 141         g_string_free(buf, TRUE);
 142
 143         sr_session_destroy(session);
 144
 145 }
 146
 147 void load_input_file(void)
 148 {
 149         struct sr_session *session;
 150         struct sr_dev_inst *sdi;
 151         GSList *devices;
 152         int ret;
 153
 154         if (!strcmp(opt_input_file, "-")) {
 155                 /* Input from stdin is never a session file. */
 156                 load_input_file_module();
 157         } else {
 158                 if ((ret = sr_session_load(sr_ctx, opt_input_file,
 159                                 &session)) == SR_OK) {
 160                         /* sigrok session file */
 161                         ret = sr_session_dev_list(session, &devices);
 162                         if (ret != SR_OK || !devices || !devices->data) {
 163                                 g_critical("Failed to access session device.");
 164                                 sr_session_destroy(session);
 165                                 return;
 166                         }
 167                         sdi = devices->data;
 168                         if (select_channels(sdi) != SR_OK) {
 169                                 sr_session_destroy(session);
 170                                 return;
 171                         }
 172                         sr_session_datafeed_callback_add(session, datafeed_in, NULL);
 173                         sr_session_start(session);
 174                         sr_session_run(session);
 175                         sr_session_stop(session);
 176                 } else if (ret != SR_ERR) {
 177                         /* It's a session file, but it didn't work out somehow. */
 178                         g_critical("Failed to load session file.");
 179                 } else {
 180                         /* Fall back on input modules. */
 181                         load_input_file_module();
 182                 }
 183         }
 184 }