output: if device has no plugin, don't report samplerate

[libsigrok.git] / output / output_text.c

diff --git a/output/output_text.c b/output/output_text.c
index 82487df01232b99c2873c59dc371aae92f16a352..05a368f056d4b0a6718fdb8a1e3ed0b290dd898e 100644 (file)
--- a/output/output_text.c
+++ b/output/output_text.c
@@ -100,17 +100,25 @@ static int init(struct output *o, int default_spl)
        else
                ctx->samples_per_line = default_spl;
 
-       ctx->header = malloc(512);
-       num_probes = g_slist_length(o->device->probes);
-       samplerate = *((uint64_t *) o->device->plugin->get_device_info(
-                       o->device->plugin_index, DI_CUR_SAMPLERATE));
-       snprintf(ctx->header, 512, "Acquisition with %d/%d probes at ",
-                ctx->num_enabled_probes, num_probes);
-
-       if ((samplerate_s = sigrok_samplerate_string(samplerate)) == NULL)
-               return -1; /* FIXME */
-       snprintf(ctx->header + strlen(ctx->header), 512, "%s\n", samplerate_s);
-       free(samplerate_s);
+       if (o->device->plugin) {
+               ctx->header = malloc(512);
+               num_probes = g_slist_length(o->device->probes);
+               samplerate = *((uint64_t *) o->device->plugin->get_device_info(
+                               o->device->plugin_index, DI_CUR_SAMPLERATE));
+               snprintf(ctx->header, 512, "Acquisition with %d/%d probes at ",
+                        ctx->num_enabled_probes, num_probes);
+
+               if ((samplerate_s = sigrok_samplerate_string(samplerate)) == NULL)
+                       return -1; /* FIXME */
+               snprintf(ctx->header + strlen(ctx->header), 512, "%s\n", samplerate_s);
+               free(samplerate_s);
+       } else {
+               /*
+                * device has no plugin: this is just a dummy device, the data
+                * comes from a file.
+                */
+               ctx->header = NULL;
+       }
 
        ctx->linebuf_len = ctx->samples_per_line * 2;
        ctx->linebuf = calloc(1, num_probes * ctx->linebuf_len);