protocol/ArgParser: add overload with max_value parameter

src/command/OtherCommands.cxx

@@ -309,14 +309,9 @@ CommandResult
 handle_setvol(Client &client, Request args)
 {
 	unsigned level;
-	if (!ParseCommandArg(client, level, args.front()))
+	if (!ParseCommandArg(client, level, args.front(), 100))
 		return CommandResult::ERROR;
 
-	if (level > 100) {
-		command_error(client, ACK_ERROR_ARG, "Invalid volume value");
-		return CommandResult::ERROR;
-	}
-
 	if (!volume_level_change(client.partition.outputs, level)) {
 		command_error(client, ACK_ERROR_SYSTEM,
 			      "problems setting volume");
@@ -330,14 +325,9 @@ CommandResult
 handle_volume(Client &client, Request args)
 {
 	int relative;
-	if (!ParseCommandArg(client, relative, args.front()))
+	if (!ParseCommandArg(client, relative, args.front(), -100, 100))
 		return CommandResult::ERROR;
 
-	if (relative < -100 || relative > 100) {
-		command_error(client, ACK_ERROR_ARG, "Invalid volume value");
-		return CommandResult::ERROR;
-	}
-
 	const int old_volume = volume_level_get(client.partition.outputs);
 	if (old_volume < 0) {
 		command_error(client, ACK_ERROR_SYSTEM, "No mixer");

src/command/QueueCommands.cxx

@@ -314,15 +314,9 @@ handle_prio(Client &client, Request args)
 {
 	const char *const priority_string = args.shift();
 	unsigned priority;
-	if (!ParseCommandArg(client, priority, priority_string))
+	if (!ParseCommandArg(client, priority, priority_string, 0xff))
 		return CommandResult::ERROR;
 
-	if (priority > 0xff) {
-		command_error(client, ACK_ERROR_ARG,
-			      "Priority out of range: %s", priority_string);
-		return CommandResult::ERROR;
-	}
-
 	for (const char *i : args) {
 		RangeArg range;
 		if (!ParseCommandArg(client, range, i))
@@ -344,15 +338,9 @@ handle_prioid(Client &client, Request args)
 {
 	const char *const priority_string = args.shift();
 	unsigned priority;
-	if (!ParseCommandArg(client, priority, priority_string))
+	if (!ParseCommandArg(client, priority, priority_string, 0xff))
 		return CommandResult::ERROR;
 
-	if (priority > 0xff) {
-		command_error(client, ACK_ERROR_ARG,
-			      "Priority out of range: %s", priority_string);
-		return CommandResult::ERROR;
-	}
-
 	for (const char *i : args) {
 		unsigned song_id;
 		if (!ParseCommandArg(client, song_id, i))

src/protocol/ArgParser.cxx

@@ -39,7 +39,8 @@ check_uint32(Client &client, uint32_t *dst, const char *s)
 }
 
 bool
-ParseCommandArg(Client &client, int &value_r, const char *s)
+ParseCommandArg(Client &client, int &value_r, const char *s,
+		int min_value, int max_value)
 {
 	char *test;
 	long value;
@@ -51,8 +52,7 @@ ParseCommandArg(Client &client, int &value_r, const char *s)
 		return false;
 	}
 
-	if (value < std::numeric_limits<int>::min() ||
-	    value > std::numeric_limits<int>::max()) {
+	if (value < min_value || value > max_value) {
 		command_error(client, ACK_ERROR_ARG,
 			      "Number too large: %s", s);
 		return false;
@@ -63,6 +63,14 @@ ParseCommandArg(Client &client, int &value_r, const char *s)
 }
 
 bool
+ParseCommandArg(Client &client, int &value_r, const char *s)
+{
+	return ParseCommandArg(client, value_r, s,
+			       std::numeric_limits<int>::min(),
+			       std::numeric_limits<int>::max());
+}
+
+bool
 ParseCommandArg(Client &client, RangeArg &value_r, const char *s)
 {
 	char *test, *test2;
@@ -129,7 +137,8 @@ ParseCommandArg(Client &client, RangeArg &value_r, const char *s)
 }
 
 bool
-ParseCommandArg(Client &client, unsigned &value_r, const char *s)
+ParseCommandArg(Client &client, unsigned &value_r, const char *s,
+		unsigned max_value)
 {
 	unsigned long value;
 	char *endptr;
@@ -141,7 +150,7 @@ ParseCommandArg(Client &client, unsigned &value_r, const char *s)
 		return false;
 	}
 
-	if (value > std::numeric_limits<unsigned>::max()) {
+	if (value > max_value) {
 		command_error(client, ACK_ERROR_ARG,
 			      "Number too large: %s", s);
 		return false;
@@ -152,6 +161,13 @@ ParseCommandArg(Client &client, unsigned &value_r, const char *s)
 }
 
 bool
+ParseCommandArg(Client &client, unsigned &value_r, const char *s)
+{
+	return ParseCommandArg(client, value_r, s,
+			       std::numeric_limits<unsigned>::max());
+}
+
+bool
 ParseCommandArg(Client &client, bool &value_r, const char *s)
 {
 	long value;

src/protocol/ArgParser.hxx

@@ -34,6 +34,10 @@ bool
 check_uint32(Client &client, uint32_t *dst, const char *s);
 
 bool
+ParseCommandArg(Client &client, int &value_r, const char *s,
+		int min_value, int max_value);
+
+bool
 ParseCommandArg(Client &client, int &value_r, const char *s);
 
 struct RangeArg {
@@ -49,6 +53,10 @@ bool
 ParseCommandArg(Client &client, RangeArg &value_r, const char *s);
 
 bool
+ParseCommandArg(Client &client, unsigned &value_r, const char *s,
+		unsigned max_value);
+
+bool
 ParseCommandArg(Client &client, unsigned &value_r, const char *s);
 
 bool