input: Don't use the sdi until it's ready.

diff --git a/input.c b/input.c
index da4e21d14b2d9ad49916c32b3b3a67445c5d6308..1b5d07e6c0ff19a9efa00370e2623035567afcc8 100644 (file)
--- a/input.c
+++ b/input.c
@@ -39,7 +39,8 @@ static void load_input_file_module(void)
        struct sr_dev_inst *sdi;
        GHashTable *mod_args, *mod_opts;
        GString *buf;
-       int fd = 0;
+       gboolean got_sdi;
+       int fd;
        ssize_t len;
        char *mod_id;
 
@@ -53,6 +54,7 @@ static void load_input_file_module(void)
                mod_id = g_hash_table_lookup(mod_args, "sigrok_key");
        }
 
+       fd = 0;
        buf = g_string_sized_new(BUFSIZE);
        if (mod_id) {
                /* User specified an input module to use. */
@@ -105,29 +107,35 @@ static void load_input_file_module(void)
                if (!in)
                        g_critical("Error: no input module found for this file.");
        }
-       sdi = sr_input_dev_inst_get(in);
-
-       if (select_channels(sdi) != SR_OK)
-               return;
-
        sr_session_new(&session);
        sr_session_datafeed_callback_add(session, &datafeed_in, NULL);
-       if (sr_session_dev_add(session, sdi) != SR_OK) {
-               g_critical("Failed to use device.");
-               sr_session_destroy(session);
-               return;
-       }
 
+       got_sdi = FALSE;
        while(TRUE) {
                g_string_truncate(buf, 0);
                len = read(fd, buf->str, BUFSIZE);
                if (len < 0)
                        g_critical("Read failed: %s", strerror(errno));
+               if (len == 0)
+                       /* End of file or stream. */
+                       break;
                buf->len = len;
                if (sr_input_send(in, buf) != SR_OK)
                        break;
-               if (len < BUFSIZE)
-                       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_free(in);
        g_string_free(buf, TRUE);