volume: moved range check to handle_setvol()

Converted the range checks in volume_level_change() to assertions.
Changed all volume types to "unsigned", expect for those which must be
able to indicate error (-1).

src/command.c

@@ -1061,6 +1061,11 @@ handle_setvol(struct client *client, G_GNUC_UNUSED int argc, char *argv[])
 	if (!check_int(client, &level, argv[1], need_integer))
 		return COMMAND_RETURN_ERROR;
 
+	if (level < 0 || level > 100) {
+		command_error(client, ACK_ERROR_ARG, "Invalid volume value");
+		return COMMAND_RETURN_ERROR;
+	}
+
 	success = volume_level_change(level);
 	if (!success) {
 		command_error(client, ACK_ERROR_SYSTEM,

src/mixer_all.c

@@ -70,12 +70,13 @@ mixer_all_get_volume(void)
 }
 
 static bool
-output_mixer_set_volume(unsigned i, int volume)
+output_mixer_set_volume(unsigned i, unsigned volume)
 {
 	struct audio_output *output;
 	struct mixer *mixer;
 
 	assert(i < audio_output_count());
+	assert(volume <= 100);
 
 	output = audio_output_get(i);
 	if (!output->enabled)
@@ -85,20 +86,17 @@ output_mixer_set_volume(unsigned i, int volume)
 	if (mixer == NULL)
 		return false;
 
-	if (volume > 100)
-		volume = 100;
-	else if (volume < 0)
-		volume = 0;
-
 	return mixer_set_volume(mixer, volume);
 }
 
 bool
-mixer_all_set_volume(int volume)
+mixer_all_set_volume(unsigned volume)
 {
 	bool success = false;
 	unsigned count = audio_output_count();
 
+	assert(volume <= 100);
+
 	for (unsigned i = 0; i < count; i++)
 		success = output_mixer_set_volume(i, volume)
 			|| success;

src/mixer_all.h

@@ -41,6 +41,6 @@ mixer_all_get_volume(void);
  * @return true on success, false on failure
  */
 bool
-mixer_all_set_volume(int volume);
+mixer_all_set_volume(unsigned volume);
 
 #endif

src/volume.c

@@ -42,7 +42,7 @@
 
 static enum mixer_type volume_mixer_type = MIXER_TYPE_HARDWARE;
 
-static int volume_software_set = 100;
+static unsigned volume_software_set = 100;
 
 /** the cached hardware mixer value; invalid if negative */
 static int last_hardware_volume = -1;
@@ -117,12 +117,9 @@ int volume_level_get(void)
 	return -1;
 }
 
-static bool software_volume_change(int volume)
+static bool software_volume_change(unsigned volume)
 {
-	if (volume > 100)
-		volume = 100;
-	else if (volume < 0)
-		volume = 0;
+	assert(volume <= 100);
 
 	volume_software_set = volume;
 
@@ -139,7 +136,7 @@ static bool software_volume_change(int volume)
 	return true;
 }
 
-static bool hardware_volume_change(int volume)
+static bool hardware_volume_change(unsigned volume)
 {
 	/* reset the cache */
 	last_hardware_volume = -1;
@@ -147,8 +144,10 @@ static bool hardware_volume_change(int volume)
 	return mixer_all_set_volume(volume);
 }
 
-bool volume_level_change(int volume)
+bool volume_level_change(unsigned volume)
 {
+	assert(volume <= 100);
+
 	idle_add(IDLE_MIXER);
 
 	switch (volume_mixer_type) {
@@ -175,7 +174,7 @@ void read_sw_volume_state(FILE *fp)
 
 		g_strchomp(buf);
 		sv = strtol(buf + strlen(SW_VOLUME_STATE), &end, 10);
-		if (G_LIKELY(!*end))
+		if (G_LIKELY(!*end) && sv >= 0 && sv <= 100)
 			software_volume_change(sv);
 		else
 			g_warning("Can't parse software volume: %s\n", buf);
@@ -186,5 +185,5 @@ void read_sw_volume_state(FILE *fp)
 void save_sw_volume_state(FILE *fp)
 {
 	if (volume_mixer_type == MIXER_TYPE_SOFTWARE)
-		fprintf(fp, SW_VOLUME_STATE "%d\n", volume_software_set);
+		fprintf(fp, SW_VOLUME_STATE "%u\n", volume_software_set);
 }

src/volume.h

@@ -29,7 +29,7 @@ void volume_finish(void);
 
 int volume_level_get(void);
 
-bool volume_level_change(int volume);
+bool volume_level_change(unsigned volume);
 
 void read_sw_volume_state(FILE *fp);