config/Parser: get_bool() throws on error

src/config/Block.cxx

@@ -75,13 +75,7 @@ BlockParam::GetPositiveValue() const
 bool
 BlockParam::GetBoolValue() const
 {
-	bool value2;
-	if (!get_bool(value.c_str(), &value2))
-		throw FormatRuntimeError("%s is not a boolean value (yes, true, 1) or "
-					 "(no, false, 0) on line %i\n",
-					 name.c_str(), line);
-
-	return value2;
+	return With(ParseBool);
 }
 
 const BlockParam *

src/config/Data.cxx

@@ -126,19 +126,11 @@ ConfigData::GetPositive(ConfigOption option, unsigned default_value) const
 bool
 ConfigData::GetBool(ConfigOption option, bool default_value) const
 {
-	const auto *param = GetParam(option);
-	bool success, value;
-
-	if (param == nullptr)
-		return default_value;
-
-	success = get_bool(param->value.c_str(), &value);
-	if (!success)
-		throw FormatRuntimeError("Expected boolean value (yes, true, 1) or "
-					 "(no, false, 0) on line %i\n",
-					 param->line);
-
-	return value;
+	return With(option, [default_value](const char *s){
+		return s != nullptr
+			? ParseBool(s)
+			: default_value;
+	});
 }
 
 ConfigBlock &

src/config/Parser.cxx

 /*
- * Copyright 2003-2018 The Music Player Daemon Project
+ * Copyright 2003-2019 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -18,23 +18,20 @@
  */
 
 #include "Parser.hxx"
+#include "util/RuntimeError.hxx"
 #include "util/StringUtil.hxx"
 
 bool
-get_bool(const char *value, bool *value_r)
+ParseBool(const char *value)
 {
 	static const char *const t[] = { "yes", "true", "1", nullptr };
 	static const char *const f[] = { "no", "false", "0", nullptr };
 
-	if (StringArrayContainsCase(t, value)) {
-		*value_r = true;
+	if (StringArrayContainsCase(t, value))
 		return true;
-	}
 
-	if (StringArrayContainsCase(f, value)) {
-		*value_r = false;
-		return true;
-	}
+	if (StringArrayContainsCase(f, value))
+		return false;
 
-	return false;
+	throw FormatRuntimeError("Not a valid boolean (\"yes\" or \"no\"): \"%s\"", value);
 }

src/config/Parser.hxx

 /*
- * Copyright 2003-2018 The Music Player Daemon Project
+ * Copyright 2003-2019 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -20,7 +20,10 @@
 #ifndef MPD_CONFIG_PARSER_HXX
 #define MPD_CONFIG_PARSER_HXX
 
+/**
+ * Throws on error.
+ */
 bool
-get_bool(const char *value, bool *value_r);
+ParseBool(const char *value);
 
 #endif