output: Move option checks to the wrapper.

Output modules are now guaranteed:
  - Every option is always given, with the default value if not supplied
    by the user, and is the right GVariantType.
  - No invalid options are ever passed.

src/output/ascii.c

@@ -30,7 +30,7 @@
 
 struct context {
 	unsigned int num_enabled_channels;
-	int samples_per_line;
+	int spl;
 	int bit_cnt;
 	int spl_cnt;
 	int trigger;
@@ -49,37 +49,15 @@ static int init(struct sr_output *o, GHashTable *options)
 	struct context *ctx;
 	struct sr_channel *ch;
 	GSList *l;
-	GHashTableIter iter;
-	gpointer key, value;
 	unsigned int i, j;
-	uint32_t spl;
 
 	if (!o || !o->sdi)
 		return SR_ERR_ARG;
 
-	spl = DEFAULT_SAMPLES_PER_LINE;
-	if (options) {
-		g_hash_table_iter_init(&iter, options);
-		while (g_hash_table_iter_next(&iter, &key, &value)) {
-			if (!strcmp(key, "width")) {
-				if (!g_variant_is_of_type(value, G_VARIANT_TYPE_UINT32)) {
-					sr_err("Invalid type for 'width' option.");
-					return SR_ERR_ARG;
-				}
-				if (!(spl = g_variant_get_uint32(value))) {
-					sr_err("Invalid width.");
-					return SR_ERR_ARG;
-				}
-			} else {
-				sr_err("Unknown option '%s'.", key);
-			}
-		}
-	}
-
 	ctx = g_malloc0(sizeof(struct context));
 	o->priv = ctx;
 	ctx->trigger = -1;
-	ctx->samples_per_line = spl;
+	ctx->spl = g_variant_get_uint32(g_hash_table_lookup(options, "width"));
 
 	for (l = o->sdi->channels; l; l = l->next) {
 		ch = l->data;
@@ -199,7 +177,7 @@ static int receive(const struct sr_output *o, const struct sr_datafeed_packet *p
 				}
 				g_string_append_c(ctx->lines[j], c);
 
-				if (ctx->spl_cnt == ctx->samples_per_line) {
+				if (ctx->spl_cnt == ctx->spl) {
 					/* Flush line buffers. */
 					g_string_append_len(*out, ctx->lines[j]->str, ctx->lines[j]->len);
 					g_string_append_c(*out, '\n');
@@ -211,7 +189,7 @@ static int receive(const struct sr_output *o, const struct sr_datafeed_packet *p
 					g_string_printf(ctx->lines[j], "%s:", ctx->channel_names[j]);
 				}
 			}
-			if (ctx->spl_cnt == ctx->samples_per_line)
+			if (ctx->spl_cnt == ctx->spl)
 				/* Line buffers were already flushed. */
 				ctx->spl_cnt = 0;
 			memcpy(ctx->prev_sample, logic->data + i, logic->unitsize);

src/output/bits.c

@@ -29,7 +29,7 @@
 
 struct context {
 	unsigned int num_enabled_channels;
-	int samples_per_line;
+	int spl;
 	int spl_cnt;
 	int trigger;
 	uint64_t samplerate;
@@ -44,37 +44,15 @@ static int init(struct sr_output *o, GHashTable *options)
 	struct context *ctx;
 	struct sr_channel *ch;
 	GSList *l;
-	GHashTableIter iter;
-	gpointer key, value;
 	unsigned int i, j;
-	uint32_t spl;
 
 	if (!o || !o->sdi)
 		return SR_ERR_ARG;
 
-	spl = DEFAULT_SAMPLES_PER_LINE;
-	if (options) {
-		g_hash_table_iter_init(&iter, options);
-		while (g_hash_table_iter_next(&iter, &key, &value)) {
-			if (!strcmp(key, "width")) {
-				if (!g_variant_is_of_type(value, G_VARIANT_TYPE_UINT32)) {
-					sr_err("Invalid type for 'width' option.");
-					return SR_ERR_ARG;
-				}
-				if (!(spl = g_variant_get_uint32(value))) {
-					sr_err("Invalid width.");
-					return SR_ERR_ARG;
-				}
-			} else {
-				sr_err("Unknown option '%s'.", key);
-			}
-		}
-	}
-
 	ctx = g_malloc0(sizeof(struct context));
 	o->priv = ctx;
 	ctx->trigger = -1;
-	ctx->samples_per_line = spl;
+	ctx->spl = g_variant_get_uint32(g_hash_table_lookup(options, "width"));
 
 	for (l = o->sdi->channels; l; l = l->next) {
 		ch = l->data;
@@ -184,7 +162,7 @@ static int receive(const struct sr_output *o, const struct sr_datafeed_packet *p
 				c = (*p & (1 << (idx % 8))) ? '1' : '0';
 				g_string_append_c(ctx->lines[j], c);
 
-				if (ctx->spl_cnt == ctx->samples_per_line) {
+				if (ctx->spl_cnt == ctx->spl) {
 					/* Flush line buffers. */
 					g_string_append_len(*out, ctx->lines[j]->str, ctx->lines[j]->len);
 					g_string_append_c(*out, '\n');
@@ -199,7 +177,7 @@ static int receive(const struct sr_output *o, const struct sr_datafeed_packet *p
 					g_string_append_c(ctx->lines[j], ' ');
 				}
 			}
-			if (ctx->spl_cnt == ctx->samples_per_line)
+			if (ctx->spl_cnt == ctx->spl)
 				/* Line buffers were already flushed. */
 				ctx->spl_cnt = 0;
 		}

src/output/hex.c

@@ -29,7 +29,7 @@
 
 struct context {
 	unsigned int num_enabled_channels;
-	int samples_per_line;
+	int spl;
 	int bit_cnt;
 	int spl_cnt;
 	int trigger;
@@ -47,38 +47,15 @@ static int init(struct sr_output *o, GHashTable *options)
 	struct context *ctx;
 	struct sr_channel *ch;
 	GSList *l;
-	GHashTableIter iter;
-	gpointer key, value;
 	unsigned int i, j;
-	uint32_t spl;
 
 	if (!o || !o->sdi)
 		return SR_ERR_ARG;
 
-	spl = DEFAULT_SAMPLES_PER_LINE;
-	if (options) {
-		g_hash_table_iter_init(&iter, options);
-		while (g_hash_table_iter_next(&iter, &key, &value)) {
-			if (!strcmp(key, "width")) {
-				if (!g_variant_is_of_type(value, G_VARIANT_TYPE_UINT32)) {
-					sr_err("Invalid type for 'width' option.");
-					return SR_ERR_ARG;
-				}
-				if (!(spl = g_variant_get_uint32(value))) {
-					sr_err("Invalid width.");
-					return SR_ERR_ARG;
-				}
-			} else {
-				sr_err("Unknown option '%s'.", key);
-				return SR_ERR_ARG;
-			}
-		}
-	}
-
 	ctx = g_malloc0(sizeof(struct context));
 	o->priv = ctx;
 	ctx->trigger = -1;
-	ctx->samples_per_line = spl;
+	ctx->spl = g_variant_get_uint32(g_hash_table_lookup(options, "width"));
 
 	for (l = o->sdi->channels; l; l = l->next) {
 		ch = l->data;
@@ -198,7 +175,7 @@ static int receive(const struct sr_output *o, const struct sr_datafeed_packet *p
 					ctx->sample_buf[j] = 0;
 				}
 
-				if (ctx->spl_cnt == ctx->samples_per_line) {
+				if (ctx->spl_cnt == ctx->spl) {
 					/* Flush line buffers. */
 					g_string_append_len(*out, ctx->lines[j]->str, ctx->lines[j]->len);
 					g_string_append_c(*out, '\n');
@@ -210,7 +187,7 @@ static int receive(const struct sr_output *o, const struct sr_datafeed_packet *p
 					g_string_printf(ctx->lines[j], "%s:", ctx->channel_names[j]);
 				}
 			}
-			if (ctx->spl_cnt == ctx->samples_per_line)
+			if (ctx->spl_cnt == ctx->spl)
 				/* Line buffers were already flushed. */
 				ctx->spl_cnt = 0;
 		}

src/output/output.c

@@ -212,15 +212,59 @@ SR_API const struct sr_output *sr_output_new(const struct sr_output_module *o,
 		GHashTable *options, const struct sr_dev_inst *sdi)
 {
 	struct sr_output *op;
+	struct sr_option *mod_opts;
+	const GVariantType *gvt;
+	GHashTable *new_opts;
+	GHashTableIter iter;
+	gpointer key, value;
+	int i;
 
 	op = g_malloc(sizeof(struct sr_output));
 	op->module = o;
 	op->sdi = sdi;
 
-	if (op->module->init && op->module->init(op, options) != SR_OK) {
+	if (options) {
+		new_opts = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
+				(GDestroyNotify)g_variant_unref);
+		mod_opts = o->options();
+		for (i = 0; mod_opts[i].id; i++) {
+			if (g_hash_table_lookup_extended(options, mod_opts[i].id,
+					&key, &value)) {
+				/* Option not given: insert the default value. */
+				gvt = g_variant_get_type(mod_opts[i].def);
+				if (!g_variant_is_of_type(value, gvt)) {
+					sr_err("Invalid type for '%s' option.", key);
+					g_free(op);
+					return NULL;
+				}
+				g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id),
+						g_variant_ref(value));
+			} else {
+				/* Pass option along. */
+				g_hash_table_insert(new_opts, g_strdup(mod_opts[i].id),
+						g_variant_ref(mod_opts[i].def));
+			}
+		}
+
+		/* Make sure no invalid options were given. */
+		g_hash_table_iter_init(&iter, options);
+		while (g_hash_table_iter_next(&iter, &key, &value)) {
+			if (!g_hash_table_lookup(new_opts, key)) {
+				sr_err("Output module '%s' has no option '%s'", o->id, key);
+				g_hash_table_destroy(new_opts);
+				g_free(op);
+				return NULL;
+			}
+		}
+	} else
+		new_opts = NULL;
+
+	if (op->module->init && op->module->init(op, new_opts) != SR_OK) {
+		g_hash_table_destroy(new_opts);
 		g_free(op);
 		op = NULL;
 	}
+	g_hash_table_destroy(new_opts);
 
 	return op;
 }

src/output/wav.c

@@ -91,28 +91,10 @@ static int init(struct sr_output *o, GHashTable *options)
 	struct out_context *outc;
 	struct sr_channel *ch;
 	GSList *l;
-	GHashTableIter iter;
-	gpointer key, value;
 
 	outc = g_malloc0(sizeof(struct out_context));
 	o->priv = outc;
-
+	outc->scale = g_variant_get_double(g_hash_table_lookup(options, "scale"));
-	outc->scale = 0.0;
-	if (options) {
-		g_hash_table_iter_init(&iter, options);
-		while (g_hash_table_iter_next(&iter, &key, &value)) {
-			if (!strcmp(key, "scale")) {
-				if (!g_variant_is_of_type(value, G_VARIANT_TYPE_DOUBLE)) {
-					sr_err("Invalid type for 'scale' option.");
-					return SR_ERR_ARG;
-				}
-				outc->scale = g_variant_get_double(value);
-			} else {
-				sr_err("Unknown option '%s'.", key);
-				return SR_ERR_ARG;
-			}
-		}
-	}
 
 	for (l = o->sdi->channels; l; l = l->next) {
 		ch = l->data;
@@ -359,7 +341,7 @@ static struct sr_option options[] = {
 static struct sr_option *get_options(void)
 {
 	if (!options[0].def) {
-		options[0].def = g_variant_new_double(0);
+		options[0].def = g_variant_new_double(0.0);
 		g_variant_ref_sink(options[0].def);
 	}