config/Param: split block-specific attributes to new struct ConfigBlock

src/config/Block.cxx

@@ -20,8 +20,12 @@
 #include "config.h"
 #include "Block.hxx"
 #include "ConfigParser.hxx"
+#include "ConfigPath.hxx"
 #include "system/FatalError.hxx"
+#include "fs/AllocatedPath.hxx"
+#include "util/Error.hxx"
 
+#include <assert.h>
 #include <stdlib.h>
 
 int
@@ -57,3 +61,96 @@ BlockParam::GetBoolValue() const
 
 	return value2;
 }
+
+ConfigBlock::~ConfigBlock()
+{
+	delete next;
+}
+
+const BlockParam *
+ConfigBlock::GetBlockParam(const char *name) const
+{
+	for (const auto &i : block_params) {
+		if (i.name == name) {
+			i.used = true;
+			return &i;
+		}
+	}
+
+	return nullptr;
+}
+
+const char *
+ConfigBlock::GetBlockValue(const char *name, const char *default_value) const
+{
+	const BlockParam *bp = GetBlockParam(name);
+	if (bp == nullptr)
+		return default_value;
+
+	return bp->value.c_str();
+}
+
+AllocatedPath
+ConfigBlock::GetBlockPath(const char *name, const char *default_value,
+			   Error &error) const
+{
+	assert(!error.IsDefined());
+
+	int line2 = line;
+	const char *s;
+
+	const BlockParam *bp = GetBlockParam(name);
+	if (bp != nullptr) {
+		line2 = bp->line;
+		s = bp->value.c_str();
+	} else {
+		if (default_value == nullptr)
+			return AllocatedPath::Null();
+
+		s = default_value;
+	}
+
+	AllocatedPath path = ParsePath(s, error);
+	if (gcc_unlikely(path.IsNull()))
+		error.FormatPrefix("Invalid path in \"%s\" at line %i: ",
+				   name, line2);
+
+	return path;
+}
+
+AllocatedPath
+ConfigBlock::GetBlockPath(const char *name, Error &error) const
+{
+	return GetBlockPath(name, nullptr, error);
+}
+
+int
+ConfigBlock::GetBlockValue(const char *name, int default_value) const
+{
+	const BlockParam *bp = GetBlockParam(name);
+	if (bp == nullptr)
+		return default_value;
+
+	return bp->GetIntValue();
+}
+
+unsigned
+ConfigBlock::GetBlockValue(const char *name, unsigned default_value) const
+{
+	const BlockParam *bp = GetBlockParam(name);
+	if (bp == nullptr)
+		return default_value;
+
+	return bp->GetUnsignedValue();
+}
+
+gcc_pure
+bool
+ConfigBlock::GetBlockValue(const char *name, bool default_value) const
+{
+	const BlockParam *bp = GetBlockParam(name);
+	if (bp == nullptr)
+		return default_value;
+
+	return bp->GetBoolValue();
+}

src/config/Block.hxx

@@ -21,9 +21,14 @@
 #define MPD_CONFIG_BLOCK_HXX
 
 #include "check.h"
+#include "Param.hxx"
 #include "Compiler.h"
 
 #include <string>
+#include <vector>
+
+class Error;
+class AllocatedPath;
 
 struct BlockParam {
 	std::string name;
@@ -50,4 +55,71 @@ struct BlockParam {
 	bool GetBoolValue() const;
 };
 
+struct ConfigBlock {
+	/**
+	 * The next #ConfigBlock with the same name.  The destructor
+	 * deletes the whole chain.
+	 */
+	ConfigBlock *next;
+
+	int line;
+
+	std::vector<BlockParam> block_params;
+
+	/**
+	 * This flag is false when nobody has queried the value of
+	 * this option yet.
+	 */
+	bool used;
+
+	explicit ConfigBlock(int _line=-1)
+		:next(nullptr), line(_line), used(false) {}
+
+	ConfigBlock(const ConfigBlock &) = delete;
+
+	~ConfigBlock();
+
+	ConfigBlock &operator=(const ConfigBlock &) = delete;
+
+	/**
+	 * Determine if this is a "null" instance, i.e. an empty
+	 * object that was synthesized and not loaded from a
+	 * configuration file.
+	 */
+	bool IsNull() const {
+		return line < 0;
+	}
+
+	gcc_nonnull_all
+	void AddBlockParam(const char *_name, const char *_value,
+			   int _line=-1) {
+		block_params.emplace_back(_name, _value, _line);
+	}
+
+	gcc_nonnull_all gcc_pure
+	const BlockParam *GetBlockParam(const char *_name) const;
+
+	gcc_pure
+	const char *GetBlockValue(const char *name,
+				  const char *default_value=nullptr) const;
+
+	/**
+	 * Same as config_get_path(), but looks up the setting in the
+	 * specified block.
+	 */
+	AllocatedPath GetBlockPath(const char *name, const char *default_value,
+				   Error &error) const;
+
+	AllocatedPath GetBlockPath(const char *name, Error &error) const;
+
+	gcc_pure
+	int GetBlockValue(const char *name, int default_value) const;
+
+	gcc_pure
+	unsigned GetBlockValue(const char *name, unsigned default_value) const;
+
+	gcc_pure
+	bool GetBlockValue(const char *name, bool default_value) const;
+};
+
 #endif

src/config/ConfigFile.cxx

@@ -21,6 +21,7 @@
 #include "ConfigFile.hxx"
 #include "Data.hxx"
 #include "Param.hxx"
+#include "Block.hxx"
 #include "ConfigTemplates.hxx"
 #include "util/Tokenizer.hxx"
 #include "util/StringUtil.hxx"
@@ -38,7 +39,7 @@ static constexpr char CONF_COMMENT = '#';
 static constexpr Domain config_file_domain("config_file");
 
 static bool
-config_read_name_value(struct config_param *param, char *input, unsigned line,
+config_read_name_value(ConfigBlock &block, char *input, unsigned line,
 		       Error &error)
 {
 	Tokenizer tokenizer(input);
@@ -65,7 +66,7 @@ config_read_name_value(struct config_param *param, char *input, unsigned line,
 		return false;
 	}
 
-	const BlockParam *bp = param->GetBlockParam(name);
+	const BlockParam *bp = block.GetBlockParam(name);
 	if (bp != nullptr) {
 		error.Format(config_file_domain,
 			     "\"%s\" is duplicate, first defined on line %i",
@@ -73,14 +74,14 @@ config_read_name_value(struct config_param *param, char *input, unsigned line,
 		return false;
 	}
 
-	param->AddBlockParam(name, value, line);
+	block.AddBlockParam(name, value, line);
 	return true;
 }
 
-static struct config_param *
+static ConfigBlock *
 config_read_block(BufferedReader &reader, Error &error)
 {
-	struct config_param *ret = new config_param(reader.GetLineNumber());
+	auto *ret = new ConfigBlock(reader.GetLineNumber());
 
 	while (true) {
 		char *line = reader.ReadLine();
@@ -115,7 +116,7 @@ config_read_block(BufferedReader &reader, Error &error)
 
 		/* parse name and value */
 
-		if (!config_read_name_value(ret, line, reader.GetLineNumber(),
+		if (!config_read_name_value(*ret, line, reader.GetLineNumber(),
 					    error)) {
 			assert(*line != 0);
 			delete ret;
@@ -127,6 +128,64 @@ config_read_block(BufferedReader &reader, Error &error)
 
 gcc_nonnull_all
 static void
+Append(ConfigBlock *&head, ConfigBlock *p)
+{
+	assert(p->next == nullptr);
+
+	auto **i = &head;
+	while (*i != nullptr)
+		i = &(*i)->next;
+
+	*i = p;
+}
+
+static bool
+ReadConfigBlock(ConfigData &config_data, BufferedReader &reader,
+		const char *name, ConfigOption o,
+		Tokenizer &tokenizer,
+		Error &error)
+{
+	const unsigned i = unsigned(o);
+	const ConfigTemplate &option = config_block_templates[i];
+	ConfigBlock *&head = config_data.blocks[i];
+
+	if (head != nullptr && !option.repeatable) {
+		ConfigBlock *block = head;
+		error.Format(config_file_domain,
+			     "config parameter \"%s\" is first defined "
+			     "on line %d and redefined on line %u\n",
+			     name, block->line,
+			     reader.GetLineNumber());
+		return false;
+	}
+
+	/* now parse the block or the value */
+
+	if (tokenizer.CurrentChar() != '{') {
+		error.Format(config_file_domain,
+			     "line %u: '{' expected",
+			     reader.GetLineNumber());
+		return false;
+	}
+
+	char *line = StripLeft(tokenizer.Rest() + 1);
+	if (*line != 0 && *line != CONF_COMMENT) {
+		error.Format(config_file_domain,
+			     "line %u: Unknown tokens after '{'",
+			     reader.GetLineNumber());
+		return false;
+	}
+
+	auto *param = config_read_block(reader, error);
+	if (param == nullptr)
+		return false;
+
+	Append(head, param);
+	return true;
+}
+
+gcc_nonnull_all
+static void
 Append(config_param *&head, config_param *p)
 {
 	assert(p->next == nullptr);
@@ -145,7 +204,7 @@ ReadConfigParam(ConfigData &config_data, BufferedReader &reader,
 		Error &error)
 {
 	const unsigned i = unsigned(o);
-	const ConfigTemplate &option = config_templates[i];
+	const ConfigTemplate &option = config_param_templates[i];
 	config_param *&head = config_data.params[i];
 
 	if (head != nullptr && !option.repeatable) {
@@ -160,57 +219,28 @@ ReadConfigParam(ConfigData &config_data, BufferedReader &reader,
 
 	/* now parse the block or the value */
 
-	struct config_param *param;
-	if (option.block) {
-		/* it's a block, call config_read_block() */
-
-		if (tokenizer.CurrentChar() != '{') {
-			error.Format(config_file_domain,
-				     "line %u: '{' expected",
-				     reader.GetLineNumber());
-			return false;
-		}
-
-		char *line = StripLeft(tokenizer.Rest() + 1);
-		if (*line != 0 && *line != CONF_COMMENT) {
+	const char *value = tokenizer.NextString(error);
+	if (value == nullptr) {
+		if (tokenizer.IsEnd())
 			error.Format(config_file_domain,
-				     "line %u: Unknown tokens after '{'",
+				     "line %u: Value missing",
 				     reader.GetLineNumber());
-			return false;
-		}
+		else
+			error.FormatPrefix("line %u: ",
+					   reader.GetLineNumber());
 
-		param = config_read_block(reader, error);
-		if (param == nullptr) {
-			return false;
-		}
-	} else {
-		/* a string value */
-
-		const char *value = tokenizer.NextString(error);
-		if (value == nullptr) {
-			if (tokenizer.IsEnd())
-				error.Format(config_file_domain,
-					     "line %u: Value missing",
-					     reader.GetLineNumber());
-			else
-				error.FormatPrefix("line %u: ",
-						   reader.GetLineNumber());
-
-			return false;
-		}
-
-		if (!tokenizer.IsEnd() &&
-		    tokenizer.CurrentChar() != CONF_COMMENT) {
-			error.Format(config_file_domain,
-				     "line %u: Unknown tokens after value",
-				     reader.GetLineNumber());
-			return false;
-		}
+		return false;
+	}
 
-		param = new config_param(value,
-					 reader.GetLineNumber());
+	if (!tokenizer.IsEnd() &&
+	    tokenizer.CurrentChar() != CONF_COMMENT) {
+		error.Format(config_file_domain,
+			     "line %u: Unknown tokens after value",
+			     reader.GetLineNumber());
+		return false;
 	}
 
+	auto *param = new config_param(value, reader.GetLineNumber());
 	Append(head, param);
 	return true;
 }
@@ -242,10 +272,15 @@ ReadConfigFile(ConfigData &config_data, BufferedReader &reader, Error &error)
 		   "repeatable" flag */
 
 		const ConfigOption o = ParseConfigOptionName(name);
+		ConfigBlockOption bo;
 		if (o != ConfigOption::MAX) {
 			if (!ReadConfigParam(config_data, reader, name, o,
 					     tokenizer, error))
 				return false;
+		} else if ((bo = ParseConfigBlockOptionName(name)) != ConfigBlockOption::MAX) {
+			if (!ReadConfigBlock(config_data, reader, name, o,
+					     tokenizer, error))
+				return false;
 		} else {
 			error.Format(config_file_domain,
 				     "unrecognized parameter in config file at "

src/config/ConfigGlobal.cxx

@@ -22,6 +22,7 @@
 #include "ConfigParser.hxx"
 #include "Data.hxx"
 #include "Param.hxx"
+#include "Block.hxx"
 #include "ConfigFile.hxx"
 #include "ConfigPath.hxx"
 #include "ConfigError.hxx"
@@ -51,15 +52,15 @@ ReadConfigFile(Path path, Error &error)
 }
 
 static void
-Check(const config_param *param)
+Check(const ConfigBlock &block)
 {
-	if (!param->used)
-		/* this whole config_param was not queried at all -
+	if (!block.used)
+		/* this whole block was not queried at all -
 		   the feature might be disabled at compile time?
 		   Silently ignore it here. */
 		return;
 
-	for (const auto &i : param->block_params) {
+	for (const auto &i : block.block_params) {
 		if (!i.used)
 			FormatWarning(config_domain,
 				      "option '%s' on line %i was not recognized",
@@ -69,9 +70,9 @@ Check(const config_param *param)
 
 void config_global_check(void)
 {
-	for (auto i : config_data.params)
-		for (const config_param *p = i; p != nullptr; p = p->next)
-			Check(p);
+	for (auto i : config_data.blocks)
+		for (const auto *p = i; p != nullptr; p = p->next)
+			Check(*p);
 }
 
 const config_param *
@@ -83,18 +84,27 @@ config_get_param(ConfigOption option)
 	return param;
 }
 
-const config_param *
-config_find_block(ConfigOption option, const char *key, const char *value)
+const ConfigBlock *
+config_get_block(ConfigBlockOption option)
+{
+	ConfigBlock *block = config_data.blocks[unsigned(option)];
+	if (block != nullptr)
+		block->used = true;
+	return block;
+}
+
+const ConfigBlock *
+config_find_block(ConfigBlockOption option, const char *key, const char *value)
 {
-	for (const config_param *param = config_get_param(option);
-	     param != nullptr; param = param->next) {
-		const char *value2 = param->GetBlockValue(key);
+	for (const auto *block = config_get_block(option);
+	     block != nullptr; block = block->next) {
+		const char *value2 = block->GetBlockValue(key);
 		if (value2 == nullptr)
 			FormatFatalError("block without '%s' name in line %d",
-					 key, param->line);
+					 key, block->line);
 
 		if (strcmp(value2, value) == 0)
-			return param;
+			return block;
 	}
 
 	return nullptr;

src/config/ConfigGlobal.hxx

@@ -27,6 +27,7 @@ class Error;
 class Path;
 class AllocatedPath;
 struct config_param;
+struct ConfigBlock;
 
 void config_global_init(void);
 void config_global_finish(void);
@@ -44,6 +45,10 @@ gcc_pure
 const config_param *
 config_get_param(enum ConfigOption option);
 
+gcc_pure
+const ConfigBlock *
+config_get_block(enum ConfigBlockOption option);
+
 /**
  * Find a block with a matching attribute.
  *
@@ -52,8 +57,8 @@ config_get_param(enum ConfigOption option);
  * @param value the expected attribute value
  */
 gcc_pure
-const config_param *
-config_find_block(ConfigOption option, const char *key, const char *value);
+const ConfigBlock *
+config_find_block(ConfigBlockOption option, const char *key, const char *value);
 
 /* Note on gcc_pure: Some of the functions declared pure are not
    really pure in strict sense.  They have side effect such that they

src/config/ConfigOption.hxx

@@ -49,7 +49,6 @@ enum class ConfigOption {
 	ZEROCONF_ENABLED,
 	PASSWORD,
 	DEFAULT_PERMS,
-	AUDIO_OUTPUT,
 	AUDIO_OUTPUT_FORMAT,
 	MIXER_TYPE,
 	REPLAYGAIN,
@@ -73,15 +72,20 @@ enum class ConfigOption {
 	ID3V1_ENCODING,
 	METADATA_TO_USE,
 	SAVE_ABSOLUTE_PATHS,
-	DECODER,
-	INPUT,
 	GAPLESS_MP3_PLAYBACK,
-	PLAYLIST_PLUGIN,
 	AUTO_UPDATE,
 	AUTO_UPDATE_DEPTH,
 	DESPOTIFY_USER,
 	DESPOTIFY_PASSWORD,
 	DESPOTIFY_HIGH_BITRATE,
+	MAX
+};
+
+enum class ConfigBlockOption {
+	AUDIO_OUTPUT,
+	DECODER,
+	INPUT,
+	PLAYLIST_PLUGIN,
 	AUDIO_FILTER,
 	DATABASE,
 	NEIGHBORS,
@@ -99,4 +103,11 @@ gcc_pure
 enum ConfigOption
 ParseConfigOptionName(const char *name);
 
+/**
+ * @return #ConfigOption::MAX if not found
+ */
+gcc_pure
+enum ConfigBlockOption
+ParseConfigBlockOptionName(const char *name);
+
 #endif

src/config/ConfigTemplates.cxx

@@ -23,76 +23,105 @@
 
 #include <string.h>
 
-const ConfigTemplate config_templates[] = {
-	{ "music_directory", false, false },
-	{ "playlist_directory", false, false },
-	{ "follow_inside_symlinks", false, false },
-	{ "follow_outside_symlinks", false, false },
-	{ "db_file", false, false },
-	{ "sticker_file", false, false },
-	{ "log_file", false, false },
-	{ "pid_file", false, false },
-	{ "state_file", false, false },
-	{ "state_file_interval", false, false },
-	{ "restore_paused", false, false },
-	{ "user", false, false },
-	{ "group", false, false },
-	{ "bind_to_address", true, false },
-	{ "port", false, false },
-	{ "log_level", false, false },
-	{ "zeroconf_name", false, false },
-	{ "zeroconf_enabled", false, false },
-	{ "password", true, false },
-	{ "default_permissions", false, false },
-	{ "audio_output", true, true },
-	{ "audio_output_format", false, false },
-	{ "mixer_type", false, false },
-	{ "replaygain", false, false },
-	{ "replaygain_preamp", false, false },
-	{ "replaygain_missing_preamp", false, false },
-	{ "replaygain_limit", false, false },
-	{ "volume_normalization", false, false },
-	{ "samplerate_converter", false, false },
-	{ "audio_buffer_size", false, false },
-	{ "buffer_before_play", false, false },
-	{ "http_proxy_host", false, false },
-	{ "http_proxy_port", false, false },
-	{ "http_proxy_user", false, false },
-	{ "http_proxy_password", false, false },
-	{ "connection_timeout", false, false },
-	{ "max_connections", false, false },
-	{ "max_playlist_length", false, false },
-	{ "max_command_list_size", false, false },
-	{ "max_output_buffer_size", false, false },
-	{ "filesystem_charset", false, false },
-	{ "id3v1_encoding", false, false },
-	{ "metadata_to_use", false, false },
-	{ "save_absolute_paths_in_playlists", false, false },
-	{ "decoder", true, true },
-	{ "input", true, true },
-	{ "gapless_mp3_playback", false, false },
-	{ "playlist_plugin", true, true },
-	{ "auto_update", false, false },
-	{ "auto_update_depth", false, false },
-	{ "despotify_user", false, false },
-	{ "despotify_password", false, false},
-	{ "despotify_high_bitrate", false, false },
-	{ "filter", true, true },
-	{ "database", false, true },
-	{ "neighbors", true, true },
+const ConfigTemplate config_param_templates[] = {
+	{ "music_directory", false },
+	{ "playlist_directory", false },
+	{ "follow_inside_symlinks", false },
+	{ "follow_outside_symlinks", false },
+	{ "db_file", false },
+	{ "sticker_file", false },
+	{ "log_file", false },
+	{ "pid_file", false },
+	{ "state_file", false },
+	{ "state_file_interval", false },
+	{ "restore_paused", false },
+	{ "user", false },
+	{ "group", false },
+	{ "bind_to_address", true },
+	{ "port", false },
+	{ "log_level", false },
+	{ "zeroconf_name", false },
+	{ "zeroconf_enabled", false },
+	{ "password", true },
+	{ "default_permissions", false },
+	{ "audio_output_format", false },
+	{ "mixer_type", false },
+	{ "replaygain", false },
+	{ "replaygain_preamp", false },
+	{ "replaygain_missing_preamp", false },
+	{ "replaygain_limit", false },
+	{ "volume_normalization", false },
+	{ "samplerate_converter", false },
+	{ "audio_buffer_size", false },
+	{ "buffer_before_play", false },
+	{ "http_proxy_host", false },
+	{ "http_proxy_port", false },
+	{ "http_proxy_user", false },
+	{ "http_proxy_password", false },
+	{ "connection_timeout", false },
+	{ "max_connections", false },
+	{ "max_playlist_length", false },
+	{ "max_command_list_size", false },
+	{ "max_output_buffer_size", false },
+	{ "filesystem_charset", false },
+	{ "id3v1_encoding", false },
+	{ "metadata_to_use", false },
+	{ "save_absolute_paths_in_playlists", false },
+	{ "gapless_mp3_playback", false },
+	{ "auto_update", false },
+	{ "auto_update_depth", false },
+	{ "despotify_user", false },
+	{ "despotify_password", false },
+	{ "despotify_high_bitrate", false },
 };
 
-static constexpr unsigned n_config_templates = ARRAY_SIZE(config_templates);
+static constexpr unsigned n_config_param_templates =
+	ARRAY_SIZE(config_param_templates);
 
-static_assert(n_config_templates == unsigned(ConfigOption::MAX),
-	      "Wrong number of config_templates");
+static_assert(n_config_param_templates == unsigned(ConfigOption::MAX),
+	      "Wrong number of config_param_templates");
+
+const ConfigTemplate config_block_templates[] = {
+	{ "audio_output", true },
+	{ "decoder", true },
+	{ "input", true },
+	{ "playlist_plugin", true },
+	{ "filter", true },
+	{ "database", false },
+	{ "neighbors", true },
+};
+
+static constexpr unsigned n_config_block_templates =
+	ARRAY_SIZE(config_block_templates);
+
+static_assert(n_config_block_templates == unsigned(ConfigBlockOption::MAX),
+	      "Wrong number of config_block_templates");
+
+gcc_pure
+static inline unsigned
+ParseConfigTemplateName(const ConfigTemplate templates[], unsigned count,
+			const char *name)
+{
+	unsigned i = 0;
+	for (; i < count; ++i)
+		if (strcmp(templates[i].name, name) == 0)
+			break;
+
+	return i;
+}
 
 ConfigOption
 ParseConfigOptionName(const char *name)
 {
-	for (unsigned i = 0; i < n_config_templates; ++i)
-		if (strcmp(config_templates[i].name, name) == 0)
-			return ConfigOption(i);
+	return ConfigOption(ParseConfigTemplateName(config_param_templates,
+						    n_config_param_templates,
+						    name));
+}
 
-	return ConfigOption::MAX;
+ConfigBlockOption
+ParseConfigBlockOptionName(const char *name)
+{
+	return ConfigBlockOption(ParseConfigTemplateName(config_block_templates,
+							 n_config_block_templates,
+							 name));
 }

src/config/ConfigTemplates.hxx

@@ -23,9 +23,9 @@
 struct ConfigTemplate {
 	const char *const name;
 	const bool repeatable;
-	const bool block;
 };
 
-extern const ConfigTemplate config_templates[];
+extern const ConfigTemplate config_param_templates[];
+extern const ConfigTemplate config_block_templates[];
 
 #endif

src/config/Data.cxx

@@ -20,6 +20,7 @@
 #include "config.h"
 #include "Data.hxx"
 #include "Param.hxx"
+#include "Block.hxx"
 
 void
 ConfigData::Clear()
@@ -28,4 +29,9 @@ ConfigData::Clear()
 		delete i;
 		i = nullptr;
 	}
+
+	for (auto &i : blocks) {
+		delete i;
+		i = nullptr;
+	}
 }

src/config/Data.hxx

@@ -25,9 +25,11 @@
 #include <array>
 
 struct config_param;
+struct ConfigBlock;
 
 struct ConfigData {
 	std::array<config_param *, std::size_t(ConfigOption::MAX)> params;
+	std::array<ConfigBlock *, std::size_t(ConfigBlockOption::MAX)> blocks;
 
 	void Clear();
 };

src/config/Param.cxx

@@ -19,12 +19,6 @@
 
 #include "config.h"
 #include "Param.hxx"
-#include "ConfigPath.hxx"
-#include "util/Error.hxx"
-#include "fs/AllocatedPath.hxx"
-
-#include <assert.h>
-#include <stdlib.h>
 
 config_param::config_param(const char *_value, int _line)
 	:next(nullptr), value(_value), line(_line), used(false) {}
@@ -33,91 +27,3 @@ config_param::~config_param()
 {
 	delete next;
 }
-
-const BlockParam *
-config_param::GetBlockParam(const char *name) const
-{
-	for (const auto &i : block_params) {
-		if (i.name == name) {
-			i.used = true;
-			return &i;
-		}
-	}
-
-	return nullptr;
-}
-
-const char *
-config_param::GetBlockValue(const char *name, const char *default_value) const
-{
-	const BlockParam *bp = GetBlockParam(name);
-	if (bp == nullptr)
-		return default_value;
-
-	return bp->value.c_str();
-}
-
-AllocatedPath
-config_param::GetBlockPath(const char *name, const char *default_value,
-			   Error &error) const
-{
-	assert(!error.IsDefined());
-
-	int line2 = line;
-	const char *s;
-
-	const BlockParam *bp = GetBlockParam(name);
-	if (bp != nullptr) {
-		line2 = bp->line;
-		s = bp->value.c_str();
-	} else {
-		if (default_value == nullptr)
-			return AllocatedPath::Null();
-
-		s = default_value;
-	}
-
-	AllocatedPath path = ParsePath(s, error);
-	if (gcc_unlikely(path.IsNull()))
-		error.FormatPrefix("Invalid path in \"%s\" at line %i: ",
-				   name, line2);
-
-	return path;
-}
-
-AllocatedPath
-config_param::GetBlockPath(const char *name, Error &error) const
-{
-	return GetBlockPath(name, nullptr, error);
-}
-
-int
-config_param::GetBlockValue(const char *name, int default_value) const
-{
-	const BlockParam *bp = GetBlockParam(name);
-	if (bp == nullptr)
-		return default_value;
-
-	return bp->GetIntValue();
-}
-
-unsigned
-config_param::GetBlockValue(const char *name, unsigned default_value) const
-{
-	const BlockParam *bp = GetBlockParam(name);
-	if (bp == nullptr)
-		return default_value;
-
-	return bp->GetUnsignedValue();
-}
-
-gcc_pure
-bool
-config_param::GetBlockValue(const char *name, bool default_value) const
-{
-	const BlockParam *bp = GetBlockParam(name);
-	if (bp == nullptr)
-		return default_value;
-
-	return bp->GetBoolValue();
-}

src/config/Param.hxx

@@ -20,14 +20,10 @@
 #ifndef MPD_CONFIG_PARAM_HXX
 #define MPD_CONFIG_PARAM_HXX
 
-#include "Block.hxx"
+#include "check.h"
 #include "Compiler.h"
 
 #include <string>
-#include <vector>
-
-class AllocatedPath;
-class Error;
 
 struct config_param {
 	/**
@@ -40,8 +36,6 @@ struct config_param {
 
 	int line;
 
-	std::vector<BlockParam> block_params;
-
 	/**
 	 * This flag is false when nobody has queried the value of
 	 * this option yet.
@@ -68,37 +62,6 @@ struct config_param {
 	bool IsNull() const {
 		return line < 0;
 	}
-
-	gcc_nonnull_all
-	void AddBlockParam(const char *_name, const char *_value,
-			   int _line=-1) {
-		block_params.emplace_back(_name, _value, _line);
-	}
-
-	gcc_nonnull_all gcc_pure
-	const BlockParam *GetBlockParam(const char *_name) const;
-
-	gcc_pure
-	const char *GetBlockValue(const char *name,
-				  const char *default_value=nullptr) const;
-
-	/**
-	 * Same as config_get_path(), but looks up the setting in the
-	 * specified block.
-	 */
-	AllocatedPath GetBlockPath(const char *name, const char *default_value,
-				   Error &error) const;
-
-	AllocatedPath GetBlockPath(const char *name, Error &error) const;
-
-	gcc_pure
-	int GetBlockValue(const char *name, int default_value) const;
-
-	gcc_pure
-	unsigned GetBlockValue(const char *name, unsigned default_value) const;
-
-	gcc_pure
-	bool GetBlockValue(const char *name, bool default_value) const;
 };
 
 #endif

src/db/Configured.cxx

@@ -22,6 +22,7 @@
 #include "DatabaseGlue.hxx"
 #include "config/ConfigGlobal.hxx"
 #include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "config/ConfigError.hxx"
 #include "fs/AllocatedPath.hxx"
 #include "fs/StandardDirectory.hxx"
@@ -32,7 +33,7 @@ Database *
 CreateConfiguredDatabase(EventLoop &loop, DatabaseListener &listener,
 			 Error &error)
 {
-	const auto *param = config_get_param(ConfigOption::DATABASE);
+	const auto *param = config_get_block(ConfigBlockOption::DATABASE);
 	const auto *path = config_get_param(ConfigOption::DB_FILE);
 
 	if (param != nullptr && path != nullptr) {
@@ -42,10 +43,10 @@ CreateConfiguredDatabase(EventLoop &loop, DatabaseListener &listener,
 		return nullptr;
 	}
 
-	struct config_param *allocated = nullptr;
+	ConfigBlock *allocated = nullptr;
 
 	if (param == nullptr && path != nullptr) {
-		allocated = new config_param("database", path->line);
+		allocated = new ConfigBlock(path->line);
 		allocated->AddBlockParam("path", path->value.c_str(),
 					 path->line);
 		param = allocated;
@@ -60,7 +61,7 @@ CreateConfiguredDatabase(EventLoop &loop, DatabaseListener &listener,
 
 		const auto db_file = AllocatedPath::Build(cache_dir, "mpd.db");
 
-		allocated = new config_param("database");
+		allocated = new ConfigBlock();
 		allocated->AddBlockParam("path", db_file.c_str(), -1);
 		param = allocated;
 	}

src/db/DatabaseGlue.cxx

@@ -22,17 +22,17 @@
 #include "Registry.hxx"
 #include "DatabaseError.hxx"
 #include "util/Error.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "DatabasePlugin.hxx"
 
 #include <string.h>
 
 Database *
 DatabaseGlobalInit(EventLoop &loop, DatabaseListener &listener,
-		   const config_param &param, Error &error)
+		   const ConfigBlock &block, Error &error)
 {
 	const char *plugin_name =
-		param.GetBlockValue("plugin", "simple");
+		block.GetBlockValue("plugin", "simple");
 
 	const DatabasePlugin *plugin = GetDatabasePluginByName(plugin_name);
 	if (plugin == nullptr) {
@@ -41,5 +41,5 @@ DatabaseGlobalInit(EventLoop &loop, DatabaseListener &listener,
 		return nullptr;
 	}
 
-	return plugin->create(loop, listener, param, error);
+	return plugin->create(loop, listener, block, error);
 }

src/db/DatabaseGlue.hxx

@@ -22,7 +22,7 @@
 
 #include "Compiler.h"
 
-struct config_param;
+struct ConfigBlock;
 class EventLoop;
 class DatabaseListener;
 class Database;
@@ -35,6 +35,6 @@ class Error;
  */
 Database *
 DatabaseGlobalInit(EventLoop &loop, DatabaseListener &listener,
-		   const config_param &param, Error &error);
+		   const ConfigBlock &block, Error &error);
 
 #endif

src/db/DatabasePlugin.hxx

@@ -26,7 +26,7 @@
 #ifndef MPD_DATABASE_PLUGIN_HXX
 #define MPD_DATABASE_PLUGIN_HXX
 
-struct config_param;
+struct ConfigBlock;
 class Error;
 class EventLoop;
 class DatabaseListener;
@@ -47,7 +47,7 @@ struct DatabasePlugin {
 	 * Allocates and configures a database.
 	 */
 	Database *(*create)(EventLoop &loop, DatabaseListener &listener,
-			    const config_param &param,
+			    const ConfigBlock &block,
 			    Error &error);
 
 	constexpr bool RequireStorage() const {

src/db/plugins/ProxyDatabasePlugin.cxx

@@ -30,7 +30,7 @@
 #include "db/Stats.hxx"
 #include "SongFilter.hxx"
 #include "Compiler.h"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "tag/TagBuilder.hxx"
 #include "tag/Tag.hxx"
 #include "util/Error.hxx"
@@ -97,7 +97,7 @@ public:
 		 listener(_listener) {}
 
 	static Database *Create(EventLoop &loop, DatabaseListener &listener,
-				const config_param &param,
+				const ConfigBlock &block,
 				Error &error);
 
 	virtual bool Open(Error &error) override;
@@ -129,7 +129,7 @@ public:
 	}
 
 private:
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 
 	bool Connect(Error &error);
 	bool CheckConnection(Error &error);
@@ -321,10 +321,10 @@ SendConstraints(mpd_connection *connection, const DatabaseSelection &selection)
 
 Database *
 ProxyDatabase::Create(EventLoop &loop, DatabaseListener &listener,
-		      const config_param &param, Error &error)
+		      const ConfigBlock &block, Error &error)
 {
 	ProxyDatabase *db = new ProxyDatabase(loop, listener);
-	if (!db->Configure(param, error)) {
+	if (!db->Configure(block, error)) {
 		delete db;
 		db = nullptr;
 	}
@@ -333,11 +333,11 @@ ProxyDatabase::Create(EventLoop &loop, DatabaseListener &listener,
 }
 
 bool
-ProxyDatabase::Configure(const config_param &param, gcc_unused Error &error)
+ProxyDatabase::Configure(const ConfigBlock &block, gcc_unused Error &error)
 {
-	host = param.GetBlockValue("host", "");
-	port = param.GetBlockValue("port", 0u);
-	keepalive = param.GetBlockValue("keepalive", false);
+	host = block.GetBlockValue("host", "");
+	port = block.GetBlockValue("port", 0u);
+	keepalive = block.GetBlockValue("keepalive", false);
 
 	return true;
 }

src/db/plugins/simple/SimpleDatabasePlugin.cxx

@@ -34,7 +34,7 @@
 #include "fs/io/TextFile.hxx"
 #include "fs/io/BufferedOutputStream.hxx"
 #include "fs/io/FileOutputStream.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "fs/FileSystem.hxx"
 #include "util/CharUtil.hxx"
 #include "util/Error.hxx"
@@ -76,10 +76,10 @@ inline SimpleDatabase::SimpleDatabase(AllocatedPath &&_path,
 Database *
 SimpleDatabase::Create(gcc_unused EventLoop &loop,
 		       gcc_unused DatabaseListener &listener,
-		       const config_param &param, Error &error)
+		       const ConfigBlock &block, Error &error)
 {
 	SimpleDatabase *db = new SimpleDatabase();
-	if (!db->Configure(param, error)) {
+	if (!db->Configure(block, error)) {
 		delete db;
 		db = nullptr;
 	}
@@ -88,9 +88,9 @@ SimpleDatabase::Create(gcc_unused EventLoop &loop,
 }
 
 bool
-SimpleDatabase::Configure(const config_param &param, Error &error)
+SimpleDatabase::Configure(const ConfigBlock &block, Error &error)
 {
-	path = param.GetBlockPath("path", error);
+	path = block.GetBlockPath("path", error);
 	if (path.IsNull()) {
 		if (!error.IsDefined())
 			error.Set(simple_db_domain,
@@ -100,12 +100,12 @@ SimpleDatabase::Configure(const config_param &param, Error &error)
 
 	path_utf8 = path.ToUTF8();
 
-	cache_path = param.GetBlockPath("cache_directory", error);
+	cache_path = block.GetBlockPath("cache_directory", error);
 	if (path.IsNull() && error.IsDefined())
 		return false;
 
 #ifdef ENABLE_ZLIB
-	compress = param.GetBlockValue("compress", compress);
+	compress = block.GetBlockValue("compress", compress);
 #endif
 
 	return true;

src/db/plugins/simple/SimpleDatabasePlugin.hxx

@@ -28,7 +28,7 @@
 
 #include <cassert>
 
-struct config_param;
+struct ConfigBlock;
 struct Directory;
 struct DatabasePlugin;
 class EventLoop;
@@ -73,7 +73,7 @@ class SimpleDatabase : public Database {
 
 public:
 	static Database *Create(EventLoop &loop, DatabaseListener &listener,
-				const config_param &param,
+				const ConfigBlock &block,
 				Error &error);
 
 	gcc_pure
@@ -134,7 +134,7 @@ public:
 	}
 
 private:
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 
 	gcc_pure
 	bool Check(Error &error) const;

src/db/plugins/upnp/UpnpDatabasePlugin.cxx

@@ -33,7 +33,7 @@
 #include "db/LightDirectory.hxx"
 #include "db/LightSong.hxx"
 #include "db/Stats.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "tag/TagBuilder.hxx"
 #include "tag/TagTable.hxx"
 #include "util/Error.hxx"
@@ -78,7 +78,7 @@ public:
 	UpnpDatabase():Database(upnp_db_plugin) {}
 
 	static Database *Create(EventLoop &loop, DatabaseListener &listener,
-				const config_param &param,
+				const ConfigBlock &block,
 				Error &error);
 
 	virtual bool Open(Error &error) override;
@@ -106,7 +106,7 @@ public:
 	}
 
 protected:
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 
 private:
 	bool VisitServer(const ContentDirectoryService &server,
@@ -158,10 +158,10 @@ private:
 Database *
 UpnpDatabase::Create(gcc_unused EventLoop &loop,
 		     gcc_unused DatabaseListener &listener,
-		     const config_param &param, Error &error)
+		     const ConfigBlock &block, Error &error)
 {
 	UpnpDatabase *db = new UpnpDatabase();
-	if (!db->Configure(param, error)) {
+	if (!db->Configure(block, error)) {
 		delete db;
 		return nullptr;
 	}
@@ -173,7 +173,7 @@ UpnpDatabase::Create(gcc_unused EventLoop &loop,
 }
 
 inline bool
-UpnpDatabase::Configure(const config_param &, Error &)
+UpnpDatabase::Configure(const ConfigBlock &, Error &)
 {
 	return true;
 }

src/decoder/DecoderAPI.hxx

@@ -36,7 +36,7 @@
 #include "tag/Tag.hxx"
 #include "AudioFormat.hxx"
 #include "MixRampInfo.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "Chrono.hxx"
 
 // IWYU pragma: end_exports

src/decoder/DecoderList.cxx

@@ -21,7 +21,7 @@
 #include "DecoderList.hxx"
 #include "DecoderPlugin.hxx"
 #include "config/ConfigGlobal.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "plugins/AudiofileDecoderPlugin.hxx"
 #include "plugins/PcmDecoderPlugin.hxx"
 #include "plugins/DsdiffDecoderPlugin.hxx"
@@ -127,12 +127,12 @@ decoder_plugin_from_name(const char *name)
 
 void decoder_plugin_init_all(void)
 {
-	struct config_param empty;
+	ConfigBlock empty;
 
 	for (unsigned i = 0; decoder_plugins[i] != nullptr; ++i) {
 		const DecoderPlugin &plugin = *decoder_plugins[i];
-		const struct config_param *param =
-			config_find_block(ConfigOption::DECODER, "plugin",
+		const auto *param =
+			config_find_block(ConfigBlockOption::DECODER, "plugin",
 					  plugin.name);
 
 		if (param == nullptr)

src/decoder/DecoderPlugin.hxx

@@ -22,7 +22,7 @@
 
 #include "Compiler.h"
 
-struct config_param;
+struct ConfigBlock;
 class InputStream;
 struct tag_handler;
 class Path;
@@ -44,7 +44,7 @@ struct DecoderPlugin {
 	 * @return true if the plugin was initialized successfully,
 	 * false if the plugin is not available
 	 */
-	bool (*init)(const config_param &param);
+	bool (*init)(const ConfigBlock &block);
 
 	/**
 	 * Deinitialize a decoder plugin which was initialized
@@ -112,9 +112,9 @@ struct DecoderPlugin {
 	 * @return true if the plugin was initialized successfully, false if
 	 * the plugin is not available
 	 */
-	bool Init(const config_param &param) const {
+	bool Init(const ConfigBlock &block) const {
 		return init != nullptr
-			? init(param)
+			? init(block)
 			: true;
 	}
 

src/decoder/plugins/AdPlugDecoderPlugin.cxx

@@ -38,14 +38,14 @@ static constexpr Domain adplug_domain("adplug");
 static unsigned sample_rate;
 
 static bool
-adplug_init(const config_param &param)
+adplug_init(const ConfigBlock &block)
 {
 	FormatDebug(adplug_domain, "adplug %s",
 		    CAdPlug::get_version().c_str());
 
 	Error error;
 
-	sample_rate = param.GetBlockValue("sample_rate", 48000u);
+	sample_rate = block.GetBlockValue("sample_rate", 48000u);
 	if (!audio_check_sample_rate(sample_rate, error)) {
 		LogError(error);
 		return false;

src/decoder/plugins/AudiofileDecoderPlugin.cxx

@@ -43,7 +43,7 @@ audiofile_error_func(long, const char *msg)
 }
 
 static bool
-audiofile_init(const config_param &)
+audiofile_init(const ConfigBlock &)
 {
 	afSetErrorHandler(audiofile_error_func);
 	return true;

src/decoder/plugins/DsdiffDecoderPlugin.cxx

@@ -72,9 +72,9 @@ struct DsdiffMetaData {
 static bool lsbitfirst;
 
 static bool
-dsdiff_init(const config_param &param)
+dsdiff_init(const ConfigBlock &block)
 {
-	lsbitfirst = param.GetBlockValue("lsbitfirst", false);
+	lsbitfirst = block.GetBlockValue("lsbitfirst", false);
 	return true;
 }
 

src/decoder/plugins/FfmpegDecoderPlugin.cxx

@@ -73,7 +73,7 @@ FfmpegOpenInput(AVIOContext *pb,
 }
 
 static bool
-ffmpeg_init(gcc_unused const config_param &param)
+ffmpeg_init(gcc_unused const ConfigBlock &block)
 {
 	FfmpegInit();
 	return true;

src/decoder/plugins/FlacDecoderPlugin.cxx

@@ -291,7 +291,7 @@ flac_decode(Decoder &decoder, InputStream &input_stream)
 }
 
 static bool
-oggflac_init(gcc_unused const config_param &param)
+oggflac_init(gcc_unused const ConfigBlock &block)
 {
 	return !!FLAC_API_SUPPORTS_OGG_FLAC;
 }

src/decoder/plugins/FluidsynthDecoderPlugin.cxx

@@ -73,17 +73,17 @@ fluidsynth_mpd_log_function(int level, char *message, gcc_unused void *data)
 }
 
 static bool
-fluidsynth_init(const config_param &param)
+fluidsynth_init(const ConfigBlock &block)
 {
 	Error error;
 
-	sample_rate = param.GetBlockValue("sample_rate", 48000u);
+	sample_rate = block.GetBlockValue("sample_rate", 48000u);
 	if (!audio_check_sample_rate(sample_rate, error)) {
 		LogError(error);
 		return false;
 	}
 
-	soundfont_path = param.GetBlockValue("soundfont",
+	soundfont_path = block.GetBlockValue("soundfont",
 					     "/usr/share/sounds/sf2/FluidR3_GM.sf2");
 
 	fluid_set_log_function(LAST_LOG_LEVEL,

src/decoder/plugins/MadDecoderPlugin.cxx

@@ -107,7 +107,7 @@ mad_fixed_to_24_buffer(int32_t *dest, const struct mad_synth *synth,
 }
 
 static bool
-mp3_plugin_init(gcc_unused const config_param &param)
+mp3_plugin_init(gcc_unused const ConfigBlock &block)
 {
 	gapless_playback = config_get_bool(ConfigOption::GAPLESS_MP3_PLAYBACK,
 					   DEFAULT_GAPLESS_MP3_PLAYBACK);

src/decoder/plugins/MikmodDecoderPlugin.cxx

@@ -109,15 +109,15 @@ static bool mikmod_loop;
 static unsigned mikmod_sample_rate;
 
 static bool
-mikmod_decoder_init(const config_param &param)
+mikmod_decoder_init(const ConfigBlock &block)
 {
 	static char params[] = "";
 
-	mikmod_loop = param.GetBlockValue("loop", false);
-	mikmod_sample_rate = param.GetBlockValue("sample_rate", 44100u);
+	mikmod_loop = block.GetBlockValue("loop", false);
+	mikmod_sample_rate = block.GetBlockValue("sample_rate", 44100u);
 	if (!audio_valid_sample_rate(mikmod_sample_rate))
 		FormatFatalError("Invalid sample rate in line %d: %u",
-				 param.line, mikmod_sample_rate);
+				 block.line, mikmod_sample_rate);
 
 	md_device = 0;
 	md_reverb = 0;

src/decoder/plugins/ModplugDecoderPlugin.cxx

@@ -41,12 +41,12 @@ static constexpr offset_type MODPLUG_FILE_LIMIT = 100 * 1024 * 1024;
 static int modplug_loop_count;
 
 static bool
-modplug_decoder_init(const config_param &param)
+modplug_decoder_init(const ConfigBlock &block)
 {
-	modplug_loop_count = param.GetBlockValue("loop_count", 0);
+	modplug_loop_count = block.GetBlockValue("loop_count", 0);
 	if (modplug_loop_count < -1)
 		FormatFatalError("Invalid loop count in line %d: %i",
-				 param.line, modplug_loop_count);
+				 block.line, modplug_loop_count);
 
 	return true;
 }

src/decoder/plugins/Mpg123DecoderPlugin.cxx

@@ -37,7 +37,7 @@
 static constexpr Domain mpg123_domain("mpg123");
 
 static bool
-mpd_mpg123_init(gcc_unused const config_param &param)
+mpd_mpg123_init(gcc_unused const ConfigBlock &block)
 {
 	mpg123_init();
 

src/decoder/plugins/OpusDecoderPlugin.cxx

@@ -61,7 +61,7 @@ IsOpusTags(const ogg_packet &packet)
 }
 
 static bool
-mpd_opus_init(gcc_unused const config_param &param)
+mpd_opus_init(gcc_unused const ConfigBlock &block)
 {
 	LogDebug(opus_domain, opus_get_version_string());
 

src/decoder/plugins/SidplayDecoderPlugin.cxx

@@ -64,22 +64,22 @@ sidplay_load_songlength_db(const Path path)
 }
 
 static bool
-sidplay_init(const config_param &param)
+sidplay_init(const ConfigBlock &block)
 {
 	/* read the songlengths database file */
 	Error error;
-	const auto database_path = param.GetBlockPath("songlength_database", error);
+	const auto database_path = block.GetBlockPath("songlength_database", error);
 	if (!database_path.IsNull())
 		songlength_database = sidplay_load_songlength_db(database_path);
 	else if (error.IsDefined())
 		FatalError(error);
 
-	default_songlength = param.GetBlockValue("default_songlength", 0u);
+	default_songlength = block.GetBlockValue("default_songlength", 0u);
 
 	all_files_are_containers =
-		param.GetBlockValue("all_files_are_containers", true);
+		block.GetBlockValue("all_files_are_containers", true);
 
-	filter_setting = param.GetBlockValue("filter", true);
+	filter_setting = block.GetBlockValue("filter", true);
 
 	return true;
 }

src/decoder/plugins/SndfileDecoderPlugin.cxx

@@ -32,7 +32,7 @@
 static constexpr Domain sndfile_domain("sndfile");
 
 static bool
-sndfile_init(gcc_unused const config_param &param)
+sndfile_init(gcc_unused const ConfigBlock &block)
 {
        LogDebug(sndfile_domain, sf_version_string());
        return true;

src/decoder/plugins/VorbisDecoderPlugin.cxx

@@ -194,7 +194,7 @@ vorbis_interleave(float *dest, const float *const*src,
 /* public */
 
 static bool
-vorbis_init(gcc_unused const config_param &param)
+vorbis_init(gcc_unused const ConfigBlock &block)
 {
 #ifndef HAVE_TREMOR
 	LogDebug(vorbis_domain, vorbis_version_string());

src/decoder/plugins/WildmidiDecoderPlugin.cxx

@@ -38,11 +38,11 @@ static constexpr Domain wildmidi_domain("wildmidi");
 static constexpr unsigned WILDMIDI_SAMPLE_RATE = 48000;
 
 static bool
-wildmidi_init(const config_param &param)
+wildmidi_init(const ConfigBlock &block)
 {
 	Error error;
 	const AllocatedPath path =
-		param.GetBlockPath("config_file",
+		block.GetBlockPath("config_file",
 				   "/etc/timidity/timidity.cfg",
 				   error);
 	if (path.IsNull())

src/encoder/EncoderAPI.hxx

@@ -31,7 +31,7 @@
 #include "EncoderPlugin.hxx"
 #include "AudioFormat.hxx"
 #include "tag/Tag.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 
 // IWYU pragma: end_exports
 

src/encoder/EncoderPlugin.hxx

@@ -24,14 +24,14 @@
 
 struct Encoder;
 struct AudioFormat;
-struct config_param;
+struct ConfigBlock;
 struct Tag;
 class Error;
 
 struct EncoderPlugin {
 	const char *name;
 
-	Encoder *(*init)(const config_param &param,
+	Encoder *(*init)(const ConfigBlock &block,
 			 Error &error);
 
 	void (*finish)(Encoder *encoder);
@@ -69,10 +69,10 @@ struct EncoderPlugin {
  * @return an encoder object on success, nullptr on failure
  */
 static inline Encoder *
-encoder_init(const EncoderPlugin &plugin, const config_param &param,
+encoder_init(const EncoderPlugin &plugin, const ConfigBlock &block,
 	     Error &error_r)
 {
-	return plugin.init(param, error_r);
+	return plugin.init(block, error_r);
 }
 
 #endif

src/encoder/plugins/FlacEncoderPlugin.cxx

@@ -56,21 +56,21 @@ struct flac_encoder {
 static constexpr Domain flac_encoder_domain("vorbis_encoder");
 
 static bool
-flac_encoder_configure(struct flac_encoder *encoder, const config_param &param,
+flac_encoder_configure(struct flac_encoder *encoder, const ConfigBlock &block,
 		       gcc_unused Error &error)
 {
-	encoder->compression = param.GetBlockValue("compression", 5u);
+	encoder->compression = block.GetBlockValue("compression", 5u);
 
 	return true;
 }
 
 static Encoder *
-flac_encoder_init(const config_param &param, Error &error)
+flac_encoder_init(const ConfigBlock &block, Error &error)
 {
 	flac_encoder *encoder = new flac_encoder();
 
-	/* load configuration from "param" */
-	if (!flac_encoder_configure(encoder, param, error)) {
+	/* load configuration from "block" */
+	if (!flac_encoder_configure(encoder, block, error)) {
 		/* configuration has failed, roll back and return error */
 		delete encoder;
 		return nullptr;

src/encoder/plugins/LameEncoderPlugin.cxx

@@ -47,18 +47,18 @@ struct LameEncoder final {
 
 	LameEncoder():encoder(lame_encoder_plugin) {}
 
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 };
 
 static constexpr Domain lame_encoder_domain("lame_encoder");
 
 bool
-LameEncoder::Configure(const config_param &param, Error &error)
+LameEncoder::Configure(const ConfigBlock &block, Error &error)
 {
 	const char *value;
 	char *endptr;
 
-	value = param.GetBlockValue("quality");
+	value = block.GetBlockValue("quality");
 	if (value != nullptr) {
 		/* a quality was configured (VBR) */
 
@@ -72,7 +72,7 @@ LameEncoder::Configure(const config_param &param, Error &error)
 			return false;
 		}
 
-		if (param.GetBlockValue("bitrate") != nullptr) {
+		if (block.GetBlockValue("bitrate") != nullptr) {
 			error.Set(config_domain,
 				  "quality and bitrate are both defined");
 			return false;
@@ -80,7 +80,7 @@ LameEncoder::Configure(const config_param &param, Error &error)
 	} else {
 		/* a bit rate was configured */
 
-		value = param.GetBlockValue("bitrate");
+		value = block.GetBlockValue("bitrate");
 		if (value == nullptr) {
 			error.Set(config_domain,
 				  "neither bitrate nor quality defined");
@@ -101,12 +101,12 @@ LameEncoder::Configure(const config_param &param, Error &error)
 }
 
 static Encoder *
-lame_encoder_init(const config_param &param, Error &error)
+lame_encoder_init(const ConfigBlock &block, Error &error)
 {
 	LameEncoder *encoder = new LameEncoder();
 
-	/* load configuration from "param" */
-	if (!encoder->Configure(param, error)) {
+	/* load configuration from "block" */
+	if (!encoder->Configure(block, error)) {
 		/* configuration has failed, roll back and return error */
 		delete encoder;
 		return nullptr;

src/encoder/plugins/NullEncoderPlugin.cxx

@@ -36,7 +36,7 @@ struct NullEncoder final {
 };
 
 static Encoder *
-null_encoder_init(gcc_unused const config_param &param,
+null_encoder_init(gcc_unused const ConfigBlock &block,
 		  gcc_unused Error &error)
 {
 	NullEncoder *encoder = new NullEncoder();

src/encoder/plugins/OpusEncoderPlugin.cxx

@@ -73,9 +73,9 @@ static constexpr Domain opus_encoder_domain("opus_encoder");
 
 static bool
 opus_encoder_configure(struct opus_encoder *encoder,
-		       const config_param &param, Error &error)
+		       const ConfigBlock &block, Error &error)
 {
-	const char *value = param.GetBlockValue("bitrate", "auto");
+	const char *value = block.GetBlockValue("bitrate", "auto");
 	if (strcmp(value, "auto") == 0)
 		encoder->bitrate = OPUS_AUTO;
 	else if (strcmp(value, "max") == 0)
@@ -90,13 +90,13 @@ opus_encoder_configure(struct opus_encoder *encoder,
 		}
 	}
 
-	encoder->complexity = param.GetBlockValue("complexity", 10u);
+	encoder->complexity = block.GetBlockValue("complexity", 10u);
 	if (encoder->complexity > 10) {
 		error.Format(config_domain, "Invalid complexity");
 		return false;
 	}
 
-	value = param.GetBlockValue("signal", "auto");
+	value = block.GetBlockValue("signal", "auto");
 	if (strcmp(value, "auto") == 0)
 		encoder->signal = OPUS_AUTO;
 	else if (strcmp(value, "voice") == 0)
@@ -112,12 +112,12 @@ opus_encoder_configure(struct opus_encoder *encoder,
 }
 
 static Encoder *
-opus_encoder_init(const config_param &param, Error &error)
+opus_encoder_init(const ConfigBlock &block, Error &error)
 {
 	opus_encoder *encoder = new opus_encoder();
 
-	/* load configuration from "param" */
-	if (!opus_encoder_configure(encoder, param, error)) {
+	/* load configuration from "block" */
+	if (!opus_encoder_configure(encoder, block, error)) {
 		/* configuration has failed, roll back and return error */
 		delete encoder;
 		return nullptr;

src/encoder/plugins/ShineEncoderPlugin.cxx

@@ -53,7 +53,7 @@ struct ShineEncoder {
 
 	ShineEncoder():encoder(shine_encoder_plugin){}
 
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 
 	bool Setup(Error &error);
 
@@ -63,22 +63,21 @@ struct ShineEncoder {
 static constexpr Domain shine_encoder_domain("shine_encoder");
 
 inline bool
-ShineEncoder::Configure(const config_param &param,
-			 gcc_unused Error &error)
+ShineEncoder::Configure(const ConfigBlock &block, gcc_unused Error &error)
 {
 	shine_set_config_mpeg_defaults(&config.mpeg);
-	config.mpeg.bitr = param.GetBlockValue("bitrate", 128);
+	config.mpeg.bitr = block.GetBlockValue("bitrate", 128);
 
 	return true;
 }
 
 static Encoder *
-shine_encoder_init(const config_param &param, Error &error)
+shine_encoder_init(const ConfigBlock &block, Error &error)
 {
 	ShineEncoder *encoder = new ShineEncoder();
 
-	/* load configuration from "param" */
-	if (!encoder->Configure(param, error)) {
+	/* load configuration from "block" */
+	if (!encoder->Configure(block, error)) {
 		/* configuration has failed, roll back and return error */
 		delete encoder;
 		return nullptr;

src/encoder/plugins/TwolameEncoderPlugin.cxx

@@ -53,18 +53,18 @@ struct TwolameEncoder final {
 
 	TwolameEncoder():encoder(twolame_encoder_plugin) {}
 
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 };
 
 static constexpr Domain twolame_encoder_domain("twolame_encoder");
 
 bool
-TwolameEncoder::Configure(const config_param &param, Error &error)
+TwolameEncoder::Configure(const ConfigBlock &block, Error &error)
 {
 	const char *value;
 	char *endptr;
 
-	value = param.GetBlockValue("quality");
+	value = block.GetBlockValue("quality");
 	if (value != nullptr) {
 		/* a quality was configured (VBR) */
 
@@ -78,7 +78,7 @@ TwolameEncoder::Configure(const config_param &param, Error &error)
 			return false;
 		}
 
-		if (param.GetBlockValue("bitrate") != nullptr) {
+		if (block.GetBlockValue("bitrate") != nullptr) {
 			error.Set(config_domain,
 				  "quality and bitrate are both defined");
 			return false;
@@ -86,7 +86,7 @@ TwolameEncoder::Configure(const config_param &param, Error &error)
 	} else {
 		/* a bit rate was configured */
 
-		value = param.GetBlockValue("bitrate");
+		value = block.GetBlockValue("bitrate");
 		if (value == nullptr) {
 			error.Set(config_domain,
 				  "neither bitrate nor quality defined");
@@ -107,15 +107,15 @@ TwolameEncoder::Configure(const config_param &param, Error &error)
 }
 
 static Encoder *
-twolame_encoder_init(const config_param &param, Error &error_r)
+twolame_encoder_init(const ConfigBlock &block, Error &error_r)
 {
 	FormatDebug(twolame_encoder_domain,
 		    "libtwolame version %s", get_twolame_version());
 
 	TwolameEncoder *encoder = new TwolameEncoder();
 
-	/* load configuration from "param" */
-	if (!encoder->Configure(param, error_r)) {
+	/* load configuration from "block" */
+	if (!encoder->Configure(block, error_r)) {
 		/* configuration has failed, roll back and return error */
 		delete encoder;
 		return nullptr;

src/encoder/plugins/VorbisEncoderPlugin.cxx

@@ -58,9 +58,9 @@ static constexpr Domain vorbis_encoder_domain("vorbis_encoder");
 
 static bool
 vorbis_encoder_configure(struct vorbis_encoder &encoder,
-			 const config_param &param, Error &error)
+			 const ConfigBlock &block, Error &error)
 {
-	const char *value = param.GetBlockValue("quality");
+	const char *value = block.GetBlockValue("quality");
 	if (value != nullptr) {
 		/* a quality was configured (VBR) */
 
@@ -76,7 +76,7 @@ vorbis_encoder_configure(struct vorbis_encoder &encoder,
 			return false;
 		}
 
-		if (param.GetBlockValue("bitrate") != nullptr) {
+		if (block.GetBlockValue("bitrate") != nullptr) {
 			error.Set(config_domain,
 				  "quality and bitrate are both defined");
 			return false;
@@ -84,7 +84,7 @@ vorbis_encoder_configure(struct vorbis_encoder &encoder,
 	} else {
 		/* a bit rate was configured */
 
-		value = param.GetBlockValue("bitrate");
+		value = block.GetBlockValue("bitrate");
 		if (value == nullptr) {
 			error.Set(config_domain,
 				  "neither bitrate nor quality defined");
@@ -106,12 +106,12 @@ vorbis_encoder_configure(struct vorbis_encoder &encoder,
 }
 
 static Encoder *
-vorbis_encoder_init(const config_param &param, Error &error)
+vorbis_encoder_init(const ConfigBlock &block, Error &error)
 {
 	vorbis_encoder *encoder = new vorbis_encoder();
 
-	/* load configuration from "param" */
-	if (!vorbis_encoder_configure(*encoder, param, error)) {
+	/* load configuration from "block" */
+	if (!vorbis_encoder_configure(*encoder, block, error)) {
 		/* configuration has failed, roll back and return error */
 		delete encoder;
 		return nullptr;

src/encoder/plugins/WaveEncoderPlugin.cxx

@@ -79,7 +79,7 @@ fill_wave_header(struct wave_header *header, int channels, int bits,
 }
 
 static Encoder *
-wave_encoder_init(gcc_unused const config_param &param,
+wave_encoder_init(gcc_unused const ConfigBlock &block,
 		  gcc_unused Error &error)
 {
 	WaveEncoder *encoder = new WaveEncoder();

src/filter/FilterConfig.cxx

@@ -25,6 +25,7 @@
 #include "config/ConfigOption.hxx"
 #include "config/ConfigGlobal.hxx"
 #include "config/ConfigError.hxx"
+#include "config/Block.hxx"
 #include "util/Error.hxx"
 
 #include <algorithm>
@@ -34,9 +35,8 @@
 static bool
 filter_chain_append_new(Filter &chain, const char *template_name, Error &error)
 {
-	const struct config_param *cfg =
-		config_find_block(ConfigOption::AUDIO_FILTER, "name",
-				  template_name);
+	const auto *cfg = config_find_block(ConfigBlockOption::AUDIO_FILTER,
+					    "name", template_name);
 	if (cfg == nullptr) {
 		error.Format(config_domain,
 			     "filter template not found: %s",

src/filter/FilterPlugin.cxx

@@ -20,7 +20,7 @@
 #include "config.h"
 #include "FilterPlugin.hxx"
 #include "FilterRegistry.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "config/ConfigError.hxx"
 #include "util/Error.hxx"
 
@@ -28,20 +28,20 @@
 
 Filter *
 filter_new(const struct filter_plugin *plugin,
-	   const config_param &param, Error &error)
+	   const ConfigBlock &block, Error &error)
 {
 	assert(plugin != nullptr);
 	assert(!error.IsDefined());
 
-	return plugin->init(param, error);
+	return plugin->init(block, error);
 }
 
 Filter *
-filter_configured_new(const config_param &param, Error &error)
+filter_configured_new(const ConfigBlock &block, Error &error)
 {
 	assert(!error.IsDefined());
 
-	const char *plugin_name = param.GetBlockValue("plugin");
+	const char *plugin_name = block.GetBlockValue("plugin");
 	if (plugin_name == nullptr) {
 		error.Set(config_domain, "No filter plugin specified");
 		return nullptr;
@@ -54,5 +54,5 @@ filter_configured_new(const config_param &param, Error &error)
 		return nullptr;
 	}
 
-	return filter_new(plugin, param, error);
+	return filter_new(plugin, block, error);
 }

src/filter/FilterPlugin.hxx

@@ -26,7 +26,7 @@
 #ifndef MPD_FILTER_PLUGIN_HXX
 #define MPD_FILTER_PLUGIN_HXX
 
-struct config_param;
+struct ConfigBlock;
 class Filter;
 class Error;
 
@@ -36,7 +36,7 @@ struct filter_plugin {
 	/**
          * Allocates and configures a filter.
 	 */
-	Filter *(*init)(const config_param &param, Error &error);
+	Filter *(*init)(const ConfigBlock &block, Error &error);
 };
 
 /**
@@ -50,7 +50,7 @@ struct filter_plugin {
  */
 Filter *
 filter_new(const struct filter_plugin *plugin,
-	   const config_param &param, Error &error);
+	   const ConfigBlock &block, Error &error);
 
 /**
  * Creates a new filter, loads configuration and the plugin name from
@@ -62,6 +62,6 @@ filter_new(const struct filter_plugin *plugin,
  * @return a new filter object, or nullptr on error
  */
 Filter *
-filter_configured_new(const config_param &param, Error &error);
+filter_configured_new(const ConfigBlock &block, Error &error);
 
 #endif

src/filter/plugins/AutoConvertFilterPlugin.cxx

@@ -24,7 +24,7 @@
 #include "filter/FilterInternal.hxx"
 #include "filter/FilterRegistry.hxx"
 #include "AudioFormat.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "util/ConstBuffer.hxx"
 
 #include <assert.h>
@@ -70,7 +70,7 @@ AutoConvertFilter::Open(AudioFormat &in_audio_format, Error &error)
 	if (in_audio_format != child_audio_format) {
 		/* yes - create a convert_filter */
 
-		const config_param empty;
+		const ConfigBlock empty;
 		convert = filter_new(&convert_filter_plugin, empty, error);
 		if (convert == nullptr) {
 			filter->Close();

src/filter/plugins/ChainFilterPlugin.cxx

@@ -70,7 +70,7 @@ private:
 static constexpr Domain chain_filter_domain("chain_filter");
 
 static Filter *
-chain_filter_init(gcc_unused const config_param &param,
+chain_filter_init(gcc_unused const ConfigBlock &block,
 		  gcc_unused Error &error)
 {
 	return new ChainFilter();

src/filter/plugins/ConvertFilterPlugin.cxx

@@ -59,7 +59,7 @@ public:
 };
 
 static Filter *
-convert_filter_init(gcc_unused const config_param &param,
+convert_filter_init(gcc_unused const ConfigBlock &block,
 		    gcc_unused Error &error)
 {
 	return new ConvertFilter();

src/filter/plugins/NormalizeFilterPlugin.cxx

@@ -42,7 +42,7 @@ public:
 };
 
 static Filter *
-normalize_filter_init(gcc_unused const config_param &param,
+normalize_filter_init(gcc_unused const ConfigBlock &block,
 		      gcc_unused Error &error)
 {
 	return new NormalizeFilter();

src/filter/plugins/NullFilterPlugin.cxx

@@ -48,7 +48,7 @@ public:
 };
 
 static Filter *
-null_filter_init(gcc_unused const config_param &param,
+null_filter_init(gcc_unused const ConfigBlock &block,
 		 gcc_unused Error &error)
 {
 	return new NullFilter();

src/filter/plugins/ReplayGainFilterPlugin.cxx

@@ -150,7 +150,7 @@ ReplayGainFilter::Update()
 }
 
 static Filter *
-replay_gain_filter_init(gcc_unused const config_param &param,
+replay_gain_filter_init(gcc_unused const ConfigBlock &block,
 			gcc_unused Error &error)
 {
 	return new ReplayGainFilter();

src/filter/plugins/RouteFilterPlugin.cxx

@@ -41,7 +41,7 @@
 
 #include "config.h"
 #include "config/ConfigError.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "AudioFormat.hxx"
 #include "filter/FilterPlugin.hxx"
 #include "filter/FilterInternal.hxx"
@@ -114,11 +114,11 @@ public:
 	 *  a>b, c>d, e>f, ...
 	 * where a... are non-unique, non-negative integers
 	 * and input channel a gets copied to output channel b, etc.
-	 * @param param the configuration block to read
+	 * @param block the configuration block to read
 	 * @param filter a route_filter whose min_channels and sources[] to set
 	 * @return true on success, false on error
 	 */
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 
 	/* virtual methods from class Filter */
 	AudioFormat Open(AudioFormat &af, Error &error) override;
@@ -128,7 +128,7 @@ public:
 };
 
 bool
-RouteFilter::Configure(const config_param &param, Error &error) {
+RouteFilter::Configure(const ConfigBlock &block, Error &error) {
 
 	/* TODO:
 	 * With a more clever way of marking "don't copy to output N",
@@ -142,7 +142,7 @@ RouteFilter::Configure(const config_param &param, Error &error) {
 	min_output_channels = 0;
 
 	// A cowardly default, just passthrough stereo
-	const char *routes = param.GetBlockValue("routes", "0>0, 1>1");
+	const char *routes = block.GetBlockValue("routes", "0>0, 1>1");
 	while (true) {
 		routes = StripLeft(routes);
 
@@ -205,10 +205,10 @@ RouteFilter::Configure(const config_param &param, Error &error) {
 }
 
 static Filter *
-route_filter_init(const config_param &param, Error &error)
+route_filter_init(const ConfigBlock &block, Error &error)
 {
 	RouteFilter *filter = new RouteFilter();
-	if (!filter->Configure(param, error)) {
+	if (!filter->Configure(block, error)) {
 		delete filter;
 		return nullptr;
 	}

src/filter/plugins/VolumeFilterPlugin.cxx

@@ -53,7 +53,7 @@ public:
 static constexpr Domain volume_domain("pcm_volume");
 
 static Filter *
-volume_filter_init(gcc_unused const config_param &param,
+volume_filter_init(gcc_unused const ConfigBlock &block,
 		   gcc_unused Error &error)
 {
 	return new VolumeFilter();

src/input/Init.cxx

@@ -24,7 +24,7 @@
 #include "util/Error.hxx"
 #include "config/ConfigGlobal.hxx"
 #include "config/ConfigOption.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "Log.hxx"
 
 #include <assert.h>
@@ -33,7 +33,7 @@
 bool
 input_stream_global_init(Error &error)
 {
-	const config_param empty;
+	const ConfigBlock empty;
 
 	for (unsigned i = 0; input_plugins[i] != nullptr; ++i) {
 		const InputPlugin *plugin = input_plugins[i];
@@ -42,17 +42,17 @@ input_stream_global_init(Error &error)
 		assert(*plugin->name != 0);
 		assert(plugin->open != nullptr);
 
-		const struct config_param *param =
-			config_find_block(ConfigOption::INPUT, "plugin",
+		const auto *block =
+			config_find_block(ConfigBlockOption::INPUT, "plugin",
 					  plugin->name);
-		if (param == nullptr) {
-			param = &empty;
-		} else if (!param->GetBlockValue("enabled", true))
+		if (block == nullptr) {
+			block = &empty;
+		} else if (!block->GetBlockValue("enabled", true))
 			/* the plugin is disabled in mpd.conf */
 			continue;
 
 		InputPlugin::InitResult result = plugin->init != nullptr
-			? plugin->init(*param, error)
+			? plugin->init(*block, error)
 			: InputPlugin::InitResult::SUCCESS;
 
 		switch (result) {

src/input/InputPlugin.hxx

@@ -34,7 +34,7 @@
 #endif
 #endif
 
-struct config_param;
+struct ConfigBlock;
 class InputStream;
 class Error;
 struct Tag;
@@ -69,7 +69,7 @@ struct InputPlugin {
 	 * @return true on success, false if the plugin should be
 	 * disabled
 	 */
-	InitResult (*init)(const config_param &param, Error &error);
+	InitResult (*init)(const ConfigBlock &block, Error &error);
 
 	/**
 	 * Global deinitialization.  Called once before MPD shuts

src/input/plugins/CdioParanoiaInputPlugin.cxx

@@ -31,7 +31,7 @@
 #include "system/ByteOrder.hxx"
 #include "fs/AllocatedPath.hxx"
 #include "Log.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "config/ConfigError.hxx"
 
 #include <stdio.h>
@@ -106,9 +106,9 @@ static constexpr Domain cdio_domain("cdio");
 static bool default_reverse_endian;
 
 static InputPlugin::InitResult
-input_cdio_init(const config_param &param, Error &error)
+input_cdio_init(const ConfigBlock &block, Error &error)
 {
-	const char *value = param.GetBlockValue("default_byte_order");
+	const char *value = block.GetBlockValue("default_byte_order");
 	if (value != nullptr) {
 		if (strcmp(value, "little_endian") == 0)
 			default_reverse_endian = IsBigEndian();

src/input/plugins/CurlInputPlugin.cxx

@@ -23,7 +23,7 @@
 #include "../IcyInputStream.hxx"
 #include "../InputPlugin.hxx"
 #include "config/ConfigGlobal.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "tag/Tag.hxx"
 #include "tag/TagBuilder.hxx"
 #include "event/SocketMonitor.hxx"
@@ -535,7 +535,7 @@ CurlMulti::OnTimeout()
  */
 
 static InputPlugin::InitResult
-input_curl_init(const config_param &param, Error &error)
+input_curl_init(const ConfigBlock &block, Error &error)
 {
 	CURLcode code = curl_global_init(CURL_GLOBAL_ALL);
 	if (code != CURLE_OK) {
@@ -557,10 +557,10 @@ input_curl_init(const config_param &param, Error &error)
 
 	http_200_aliases = curl_slist_append(http_200_aliases, "ICY 200 OK");
 
-	proxy = param.GetBlockValue("proxy");
-	proxy_port = param.GetBlockValue("proxy_port", 0u);
-	proxy_user = param.GetBlockValue("proxy_user");
-	proxy_password = param.GetBlockValue("proxy_password");
+	proxy = block.GetBlockValue("proxy");
+	proxy_port = block.GetBlockValue("proxy_port", 0u);
+	proxy_user = block.GetBlockValue("proxy_user");
+	proxy_password = block.GetBlockValue("proxy_password");
 
 	if (proxy == nullptr) {
 		/* deprecated proxy configuration */
@@ -571,8 +571,8 @@ input_curl_init(const config_param &param, Error &error)
 						   "");
 	}
 
-	verify_peer = param.GetBlockValue("verify_peer", true);
-	verify_host = param.GetBlockValue("verify_host", true);
+	verify_peer = block.GetBlockValue("verify_peer", true);
+	verify_host = block.GetBlockValue("verify_host", true);
 
 	CURLM *multi = curl_multi_init();
 	if (multi == nullptr) {

src/input/plugins/FfmpegInputPlugin.cxx

@@ -72,7 +72,7 @@ input_ffmpeg_supported(void)
 }
 
 static InputPlugin::InitResult
-input_ffmpeg_init(gcc_unused const config_param &param,
+input_ffmpeg_init(gcc_unused const ConfigBlock &block,
 		  Error &error)
 {
 	FfmpegInit();

src/input/plugins/NfsInputPlugin.cxx

@@ -221,7 +221,7 @@ NfsInputStream::OnNfsFileError(Error &&error)
  */
 
 static InputPlugin::InitResult
-input_nfs_init(const config_param &, Error &)
+input_nfs_init(const ConfigBlock &, Error &)
 {
 	nfs_init();
 	return InputPlugin::InitResult::SUCCESS;

src/input/plugins/SmbclientInputPlugin.cxx

@@ -66,14 +66,14 @@ public:
  */
 
 static InputPlugin::InitResult
-input_smbclient_init(gcc_unused const config_param &param, Error &error)
+input_smbclient_init(gcc_unused const ConfigBlock &block, Error &error)
 {
 	if (!SmbclientInit(error))
 		return InputPlugin::InitResult::UNAVAILABLE;
 
 	// TODO: create one global SMBCCTX here?
 
-	// TODO: evaluate config_param, call smbc_setOption*()
+	// TODO: evaluate ConfigBlock, call smbc_setOption*()
 
 	return InputPlugin::InitResult::SUCCESS;
 }

src/mixer/MixerControl.cxx

@@ -28,10 +28,10 @@ Mixer *
 mixer_new(EventLoop &event_loop,
 	  const MixerPlugin &plugin, AudioOutput &ao,
 	  MixerListener &listener,
-	  const config_param &param,
+	  const ConfigBlock &block,
 	  Error &error)
 {
-	Mixer *mixer = plugin.init(event_loop, ao, listener, param, error);
+	Mixer *mixer = plugin.init(event_loop, ao, listener, block, error);
 
 	assert(mixer == nullptr || mixer->IsPlugin(plugin));
 

src/mixer/MixerControl.hxx

@@ -31,12 +31,12 @@ class EventLoop;
 struct AudioOutput;
 struct MixerPlugin;
 class MixerListener;
-struct config_param;
+struct ConfigBlock;
 
 Mixer *
 mixer_new(EventLoop &event_loop, const MixerPlugin &plugin, AudioOutput &ao,
 	  MixerListener &listener,
-	  const config_param &param,
+	  const ConfigBlock &block,
 	  Error &error);
 
 void

src/mixer/MixerPlugin.hxx

@@ -27,7 +27,7 @@
 #ifndef MPD_MIXER_PLUGIN_HXX
 #define MPD_MIXER_PLUGIN_HXX
 
-struct config_param;
+struct ConfigBlock;
 struct AudioOutput;
 class Mixer;
 class MixerListener;
@@ -46,7 +46,7 @@ struct MixerPlugin {
 	 */
 	Mixer *(*init)(EventLoop &event_loop, AudioOutput &ao,
 		       MixerListener &listener,
-		       const config_param &param,
+		       const ConfigBlock &block,
 		       Error &error);
 
 	/**

src/mixer/plugins/AlsaMixerPlugin.cxx

@@ -82,7 +82,7 @@ public:
 
 	virtual ~AlsaMixer();
 
-	void Configure(const config_param &param);
+	void Configure(const ConfigBlock &block);
 	bool Setup(Error &error);
 
 	/* virtual methods from class Mixer */
@@ -162,24 +162,24 @@ alsa_mixer_elem_callback(snd_mixer_elem_t *elem, unsigned mask)
  */
 
 inline void
-AlsaMixer::Configure(const config_param &param)
+AlsaMixer::Configure(const ConfigBlock &block)
 {
-	device = param.GetBlockValue("mixer_device",
+	device = block.GetBlockValue("mixer_device",
 				     VOLUME_MIXER_ALSA_DEFAULT);
-	control = param.GetBlockValue("mixer_control",
+	control = block.GetBlockValue("mixer_control",
 				      VOLUME_MIXER_ALSA_CONTROL_DEFAULT);
-	index = param.GetBlockValue("mixer_index",
+	index = block.GetBlockValue("mixer_index",
 				    VOLUME_MIXER_ALSA_INDEX_DEFAULT);
 }
 
 static Mixer *
 alsa_mixer_init(EventLoop &event_loop, gcc_unused AudioOutput &ao,
 		MixerListener &listener,
-		const config_param &param,
+		const ConfigBlock &block,
 		gcc_unused Error &error)
 {
 	AlsaMixer *am = new AlsaMixer(event_loop, listener);
-	am->Configure(param);
+	am->Configure(block);
 
 	return am;
 }

src/mixer/plugins/NullMixerPlugin.cxx

@@ -55,7 +55,7 @@ static Mixer *
 null_mixer_init(gcc_unused EventLoop &event_loop,
 		gcc_unused AudioOutput &ao,
 		MixerListener &listener,
-		gcc_unused const config_param &param,
+		gcc_unused const ConfigBlock &block,
 		gcc_unused Error &error)
 {
 	return new NullMixer(listener);

src/mixer/plugins/OssMixerPlugin.cxx

@@ -19,7 +19,7 @@
 
 #include "config.h"
 #include "mixer/MixerInternal.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "system/fd_util.h"
 #include "util/ASCII.hxx"
 #include "util/Error.hxx"
@@ -52,7 +52,7 @@ public:
 	OssMixer(MixerListener &_listener)
 		:Mixer(oss_mixer_plugin, _listener) {}
 
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 
 	/* virtual methods from class Mixer */
 	virtual bool Open(Error &error) override;
@@ -79,10 +79,10 @@ oss_find_mixer(const char *name)
 }
 
 inline bool
-OssMixer::Configure(const config_param &param, Error &error)
+OssMixer::Configure(const ConfigBlock &block, Error &error)
 {
-	device = param.GetBlockValue("mixer_device", VOLUME_MIXER_OSS_DEFAULT);
-	control = param.GetBlockValue("mixer_control");
+	device = block.GetBlockValue("mixer_device", VOLUME_MIXER_OSS_DEFAULT);
+	control = block.GetBlockValue("mixer_control");
 
 	if (control != NULL) {
 		volume_control = oss_find_mixer(control);
@@ -100,12 +100,12 @@ OssMixer::Configure(const config_param &param, Error &error)
 static Mixer *
 oss_mixer_init(gcc_unused EventLoop &event_loop, gcc_unused AudioOutput &ao,
 	       MixerListener &listener,
-	       const config_param &param,
+	       const ConfigBlock &block,
 	       Error &error)
 {
 	OssMixer *om = new OssMixer(listener);
 
-	if (!om->Configure(param, error)) {
+	if (!om->Configure(block, error)) {
 		delete om;
 		return nullptr;
 	}

src/mixer/plugins/PulseMixerPlugin.cxx

@@ -163,7 +163,7 @@ pulse_mixer_on_change(PulseMixer &pm,
 static Mixer *
 pulse_mixer_init(gcc_unused EventLoop &event_loop, AudioOutput &ao,
 		 MixerListener &listener,
-		 gcc_unused const config_param &param,
+		 gcc_unused const ConfigBlock &block,
 		 gcc_unused Error &error)
 {
 	PulseOutput &po = (PulseOutput &)ao;

src/mixer/plugins/RoarMixerPlugin.cxx

@@ -48,7 +48,7 @@ public:
 static Mixer *
 roar_mixer_init(gcc_unused EventLoop &event_loop, AudioOutput &ao,
 		MixerListener &listener,
-		gcc_unused const config_param &param,
+		gcc_unused const ConfigBlock &block,
 		gcc_unused Error &error)
 {
 	return new RoarMixer((RoarOutput &)ao, listener);

src/mixer/plugins/SoftwareMixerPlugin.cxx

@@ -25,7 +25,7 @@
 #include "filter/FilterInternal.hxx"
 #include "filter/plugins/VolumeFilterPlugin.hxx"
 #include "pcm/Volume.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "util/Error.hxx"
 
 #include <assert.h>
@@ -34,7 +34,7 @@
 static Filter *
 CreateVolumeFilter()
 {
-	return filter_new(&volume_filter_plugin, config_param(),
+	return filter_new(&volume_filter_plugin, ConfigBlock(),
 			  IgnoreError());
 }
 
@@ -90,7 +90,7 @@ static Mixer *
 software_mixer_init(gcc_unused EventLoop &event_loop,
 		    gcc_unused AudioOutput &ao,
 		    MixerListener &listener,
-		    gcc_unused const config_param &param,
+		    gcc_unused const ConfigBlock &block,
 		    gcc_unused Error &error)
 {
 	return new SoftwareMixer(listener);

src/mixer/plugins/WinmmMixerPlugin.cxx

@@ -69,7 +69,7 @@ winmm_volume_encode(int volume)
 static Mixer *
 winmm_mixer_init(gcc_unused EventLoop &event_loop, AudioOutput &ao,
 		 MixerListener &listener,
-		 gcc_unused const config_param &param,
+		 gcc_unused const ConfigBlock &block,
 		 gcc_unused Error &error)
 {
 	return new WinmmMixer((WinmmOutput &)ao, listener);

src/neighbor/Glue.cxx

@@ -24,8 +24,8 @@
 #include "NeighborPlugin.hxx"
 #include "Info.hxx"
 #include "config/ConfigGlobal.hxx"
-#include "config/Param.hxx"
 #include "config/ConfigError.hxx"
+#include "config/Block.hxx"
 #include "util/Error.hxx"
 
 NeighborGlue::Explorer::~Explorer()
@@ -37,9 +37,9 @@ NeighborGlue::~NeighborGlue() {}
 
 static NeighborExplorer *
 CreateNeighborExplorer(EventLoop &loop, NeighborListener &listener,
-		       const config_param &param, Error &error)
+		       const ConfigBlock &block, Error &error)
 {
-	const char *plugin_name = param.GetBlockValue("plugin");
+	const char *plugin_name = block.GetBlockValue("plugin");
 	if (plugin_name == nullptr) {
 		error.Set(config_domain,
 			  "Missing \"plugin\" configuration");
@@ -53,18 +53,18 @@ CreateNeighborExplorer(EventLoop &loop, NeighborListener &listener,
 		return nullptr;
 	}
 
-	return plugin->create(loop, listener, param, error);
+	return plugin->create(loop, listener, block, error);
 }
 
 bool
 NeighborGlue::Init(EventLoop &loop, NeighborListener &listener, Error &error)
 {
-	for (const auto *param = config_get_param(ConfigOption::NEIGHBORS);
-	     param != nullptr; param = param->next) {
+	for (const auto *block = config_get_block(ConfigBlockOption::NEIGHBORS);
+	     block != nullptr; block = block->next) {
 		NeighborExplorer *explorer =
-			CreateNeighborExplorer(loop, listener, *param, error);
+			CreateNeighborExplorer(loop, listener, *block, error);
 		if (explorer == nullptr) {
-			error.FormatPrefix("Line %i: ", param->line);
+			error.FormatPrefix("Line %i: ", block->line);
 			return false;
 		}
 

src/neighbor/NeighborPlugin.hxx

@@ -20,7 +20,7 @@
 #ifndef MPD_NEIGHBOR_PLUGIN_HXX
 #define MPD_NEIGHBOR_PLUGIN_HXX
 
-struct config_param;
+struct ConfigBlock;
 class Error;
 class EventLoop;
 class NeighborListener;
@@ -33,7 +33,7 @@ struct NeighborPlugin {
 	 * Allocates and configures a #NeighborExplorer instance.
 	 */
 	NeighborExplorer *(*create)(EventLoop &loop, NeighborListener &listener,
-				    const config_param &param,
+				    const ConfigBlock &block,
 				    Error &error);
 };
 

src/neighbor/plugins/SmbclientNeighborPlugin.cxx

@@ -273,7 +273,7 @@ SmbclientNeighborExplorer::ThreadFunc(void *ctx)
 static NeighborExplorer *
 smbclient_neighbor_create(gcc_unused EventLoop &loop,
 			  NeighborListener &listener,
-			  gcc_unused const config_param &param,
+			  gcc_unused const ConfigBlock &block,
 			  gcc_unused Error &error)
 {
 	if (!SmbclientInit(error))

src/neighbor/plugins/UpnpNeighborPlugin.cxx

@@ -127,7 +127,7 @@ UpnpNeighborExplorer::LostUPnP(const ContentDirectoryService &service)
 static NeighborExplorer *
 upnp_neighbor_create(gcc_unused EventLoop &loop,
 		     NeighborListener &listener,
-		     gcc_unused const config_param &param,
+		     gcc_unused const ConfigBlock &block,
 		     gcc_unused Error &error)
 {
 	return new UpnpNeighborExplorer(listener);

src/output/Init.cxx

@@ -35,6 +35,7 @@
 #include "filter/plugins/ChainFilterPlugin.hxx"
 #include "config/ConfigError.hxx"
 #include "config/ConfigGlobal.hxx"
+#include "config/Block.hxx"
 #include "util/Error.hxx"
 #include "Log.hxx"
 
@@ -95,15 +96,15 @@ audio_output_detect(Error &error)
  */
 gcc_pure
 static MixerType
-audio_output_mixer_type(const config_param &param)
+audio_output_mixer_type(const ConfigBlock &block)
 {
 	/* read the local "mixer_type" setting */
-	const char *p = param.GetBlockValue("mixer_type");
+	const char *p = block.GetBlockValue("mixer_type");
 	if (p != nullptr)
 		return mixer_type_parse(p);
 
 	/* try the local "mixer_enabled" setting next (deprecated) */
-	if (!param.GetBlockValue("mixer_enabled", true))
+	if (!block.GetBlockValue("mixer_enabled", true))
 		return MixerType::NONE;
 
 	/* fall back to the global "mixer_type" setting (also
@@ -114,7 +115,7 @@ audio_output_mixer_type(const config_param &param)
 
 static Mixer *
 audio_output_load_mixer(EventLoop &event_loop, AudioOutput &ao,
-			const config_param &param,
+			const ConfigBlock &block,
 			const MixerPlugin *plugin,
 			Filter &filter_chain,
 			MixerListener &listener,
@@ -122,26 +123,26 @@ audio_output_load_mixer(EventLoop &event_loop, AudioOutput &ao,
 {
 	Mixer *mixer;
 
-	switch (audio_output_mixer_type(param)) {
+	switch (audio_output_mixer_type(block)) {
 	case MixerType::NONE:
 	case MixerType::UNKNOWN:
 		return nullptr;
 
 	case MixerType::NULL_:
 		return mixer_new(event_loop, null_mixer_plugin, ao, listener,
-				 param, error);
+				 block, error);
 
 	case MixerType::HARDWARE:
 		if (plugin == nullptr)
 			return nullptr;
 
 		return mixer_new(event_loop, *plugin, ao, listener,
-				 param, error);
+				 block, error);
 
 	case MixerType::SOFTWARE:
 		mixer = mixer_new(event_loop, software_mixer_plugin, ao,
 				  listener,
-				  config_param(),
+				  ConfigBlock(),
 				  IgnoreError());
 		assert(mixer != nullptr);
 
@@ -155,17 +156,17 @@ audio_output_load_mixer(EventLoop &event_loop, AudioOutput &ao,
 }
 
 bool
-AudioOutput::Configure(const config_param &param, Error &error)
+AudioOutput::Configure(const ConfigBlock &block, Error &error)
 {
-	if (!param.IsNull()) {
-		name = param.GetBlockValue(AUDIO_OUTPUT_NAME);
+	if (!block.IsNull()) {
+		name = block.GetBlockValue(AUDIO_OUTPUT_NAME);
 		if (name == nullptr) {
 			error.Set(config_domain,
 				  "Missing \"name\" configuration");
 			return false;
 		}
 
-		const char *p = param.GetBlockValue(AUDIO_OUTPUT_FORMAT);
+		const char *p = block.GetBlockValue(AUDIO_OUTPUT_FORMAT);
 		if (p != nullptr) {
 			bool success =
 				audio_format_parse(config_audio_format,
@@ -180,9 +181,9 @@ AudioOutput::Configure(const config_param &param, Error &error)
 		config_audio_format.Clear();
 	}
 
-	tags = param.GetBlockValue("tags", true);
-	always_on = param.GetBlockValue("always_on", false);
-	enabled = param.GetBlockValue("enabled", true);
+	tags = block.GetBlockValue("tags", true);
+	always_on = block.GetBlockValue("always_on", false);
+	enabled = block.GetBlockValue("enabled", true);
 
 	/* set up the filter chain */
 
@@ -193,7 +194,7 @@ AudioOutput::Configure(const config_param &param, Error &error)
 
 	if (config_get_bool(ConfigOption::VOLUME_NORMALIZATION, false)) {
 		Filter *normalize_filter =
-			filter_new(&normalize_filter_plugin, config_param(),
+			filter_new(&normalize_filter_plugin, ConfigBlock(),
 				   IgnoreError());
 		assert(normalize_filter != nullptr);
 
@@ -203,7 +204,7 @@ AudioOutput::Configure(const config_param &param, Error &error)
 
 	Error filter_error;
 	filter_chain_parse(*filter,
-			   param.GetBlockValue(AUDIO_FILTERS, ""),
+			   block.GetBlockValue(AUDIO_FILTERS, ""),
 			   filter_error);
 
 	// It's not really fatal - Part of the filter chain has been set up already
@@ -221,24 +222,24 @@ AudioOutput::Configure(const config_param &param, Error &error)
 static bool
 audio_output_setup(EventLoop &event_loop, AudioOutput &ao,
 		   MixerListener &mixer_listener,
-		   const config_param &param,
+		   const ConfigBlock &block,
 		   Error &error)
 {
 
 	/* create the replay_gain filter */
 
 	const char *replay_gain_handler =
-		param.GetBlockValue("replay_gain_handler", "software");
+		block.GetBlockValue("replay_gain_handler", "software");
 
 	if (strcmp(replay_gain_handler, "none") != 0) {
 		ao.replay_gain_filter = filter_new(&replay_gain_filter_plugin,
-						   param, IgnoreError());
+						   block, IgnoreError());
 		assert(ao.replay_gain_filter != nullptr);
 
 		ao.replay_gain_serial = 0;
 
 		ao.other_replay_gain_filter = filter_new(&replay_gain_filter_plugin,
-							 param,
+							 block,
 							 IgnoreError());
 		assert(ao.other_replay_gain_filter != nullptr);
 
@@ -251,7 +252,7 @@ audio_output_setup(EventLoop &event_loop, AudioOutput &ao,
 	/* set up the mixer */
 
 	Error mixer_error;
-	ao.mixer = audio_output_load_mixer(event_loop, ao, param,
+	ao.mixer = audio_output_load_mixer(event_loop, ao, block,
 					   ao.plugin.mixer_plugin,
 					   *ao.filter,
 					   mixer_listener,
@@ -279,7 +280,7 @@ audio_output_setup(EventLoop &event_loop, AudioOutput &ao,
 
 	/* the "convert" filter must be the last one in the chain */
 
-	ao.convert_filter = filter_new(&convert_filter_plugin, config_param(),
+	ao.convert_filter = filter_new(&convert_filter_plugin, ConfigBlock(),
 					IgnoreError());
 	assert(ao.convert_filter != nullptr);
 
@@ -289,17 +290,17 @@ audio_output_setup(EventLoop &event_loop, AudioOutput &ao,
 }
 
 AudioOutput *
-audio_output_new(EventLoop &event_loop, const config_param &param,
+audio_output_new(EventLoop &event_loop, const ConfigBlock &block,
 		 MixerListener &mixer_listener,
 		 PlayerControl &pc,
 		 Error &error)
 {
 	const AudioOutputPlugin *plugin;
 
-	if (!param.IsNull()) {
+	if (!block.IsNull()) {
 		const char *p;
 
-		p = param.GetBlockValue(AUDIO_OUTPUT_TYPE);
+		p = block.GetBlockValue(AUDIO_OUTPUT_TYPE);
 		if (p == nullptr) {
 			error.Set(config_domain,
 				  "Missing \"type\" configuration");
@@ -325,12 +326,12 @@ audio_output_new(EventLoop &event_loop, const config_param &param,
 			      plugin->name);
 	}
 
-	AudioOutput *ao = ao_plugin_init(plugin, param, error);
+	AudioOutput *ao = ao_plugin_init(plugin, block, error);
 	if (ao == nullptr)
 		return nullptr;
 
 	if (!audio_output_setup(event_loop, *ao, mixer_listener,
-				param, error)) {
+				block, error)) {
 		ao_plugin_finish(ao);
 		return nullptr;
 	}

src/output/Internal.hxx

@@ -36,7 +36,7 @@ class EventLoop;
 class Mixer;
 class MixerListener;
 struct MusicChunk;
-struct config_param;
+struct ConfigBlock;
 struct PlayerControl;
 struct AudioOutputPlugin;
 
@@ -272,7 +272,7 @@ struct AudioOutput {
 	AudioOutput(const AudioOutputPlugin &_plugin);
 	~AudioOutput();
 
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 
 	void StartThread();
 	void StopThread();
@@ -430,7 +430,7 @@ private:
 extern struct notify audio_output_client_notify;
 
 AudioOutput *
-audio_output_new(EventLoop &event_loop, const config_param &param,
+audio_output_new(EventLoop &event_loop, const ConfigBlock &block,
 		 MixerListener &mixer_listener,
 		 PlayerControl &pc,
 		 Error &error);

src/output/MultipleOutputs.cxx

@@ -27,7 +27,7 @@
 #include "MusicChunk.hxx"
 #include "system/FatalError.hxx"
 #include "util/Error.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "config/ConfigGlobal.hxx"
 #include "config/ConfigOption.hxx"
 #include "notify.hxx"
@@ -53,16 +53,16 @@ MultipleOutputs::~MultipleOutputs()
 
 static AudioOutput *
 LoadOutput(EventLoop &event_loop, MixerListener &mixer_listener,
-	   PlayerControl &pc, const config_param &param)
+	   PlayerControl &pc, const ConfigBlock &block)
 {
 	Error error;
-	AudioOutput *output = audio_output_new(event_loop, param,
+	AudioOutput *output = audio_output_new(event_loop, block,
 					       mixer_listener,
 					       pc, error);
 	if (output == nullptr) {
-		if (param.line > 0)
+		if (block.line > 0)
 			FormatFatalError("line %i: %s",
-					 param.line,
+					 block.line,
 					 error.GetMessage());
 		else
 			FatalError(error);
@@ -74,7 +74,7 @@ LoadOutput(EventLoop &event_loop, MixerListener &mixer_listener,
 void
 MultipleOutputs::Configure(EventLoop &event_loop, PlayerControl &pc)
 {
-	for (const auto *param = config_get_param(ConfigOption::AUDIO_OUTPUT);
+	for (const auto *param = config_get_block(ConfigBlockOption::AUDIO_OUTPUT);
 	     param != nullptr; param = param->next) {
 		auto output = LoadOutput(event_loop, mixer_listener,
 					 pc, *param);
@@ -87,7 +87,7 @@ MultipleOutputs::Configure(EventLoop &event_loop, PlayerControl &pc)
 
 	if (outputs.empty()) {
 		/* auto-detect device */
-		const config_param empty;
+		const ConfigBlock empty;
 		auto output = LoadOutput(event_loop, mixer_listener,
 					 pc, empty);
 		outputs.push_back(output);

src/output/OutputAPI.hxx

@@ -26,7 +26,7 @@
 #include "Internal.hxx"
 #include "AudioFormat.hxx"
 #include "tag/Tag.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 
 // IWYU pragma: end_exports
 

src/output/OutputPlugin.cxx

@@ -23,13 +23,13 @@
 
 AudioOutput *
 ao_plugin_init(const AudioOutputPlugin *plugin,
-	       const config_param &param,
+	       const ConfigBlock &block,
 	       Error &error)
 {
 	assert(plugin != nullptr);
 	assert(plugin->init != nullptr);
 
-	return plugin->init(param, error);
+	return plugin->init(block, error);
 }
 
 void

src/output/OutputPlugin.hxx

@@ -24,7 +24,7 @@
 
 #include <stddef.h>
 
-struct config_param;
+struct ConfigBlock;
 struct AudioFormat;
 struct Tag;
 struct AudioOutput;
@@ -55,8 +55,7 @@ struct AudioOutputPlugin {
 	 * @return nullptr on error, or an opaque pointer to the plugin's
 	 * data
 	 */
-	AudioOutput *(*init)(const config_param &param,
-				     Error &error);
+	AudioOutput *(*init)(const ConfigBlock &block, Error &error);
 
 	/**
 	 * Free resources allocated by this device.
@@ -162,7 +161,7 @@ ao_plugin_test_default_device(const AudioOutputPlugin *plugin)
 gcc_malloc
 AudioOutput *
 ao_plugin_init(const AudioOutputPlugin *plugin,
-	       const config_param &param,
+	       const ConfigBlock &block,
 	       Error &error);
 
 void

src/output/Wrapper.hxx

@@ -22,14 +22,16 @@
 
 #include "util/Cast.hxx"
 
+struct ConfigBlock;
+
 template<class T>
 struct AudioOutputWrapper {
 	static T &Cast(AudioOutput &ao) {
 		return ContainerCast(ao, &T::base);
 	}
 
-	static AudioOutput *Init(const config_param &param, Error &error) {
-		T *t = T::Create(param, error);
+	static AudioOutput *Init(const ConfigBlock &block, Error &error) {
+		T *t = T::Create(block, error);
 		return t != nullptr
 			? &t->base
 			: nullptr;

src/output/plugins/AlsaOutputPlugin.cxx

@@ -142,8 +142,8 @@ struct AlsaOutput {
 		return device.empty() ? default_device : device.c_str();
 	}
 
-	bool Configure(const config_param &param, Error &error);
-	static AlsaOutput *Create(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
+	static AlsaOutput *Create(const ConfigBlock &block, Error &error);
 
 	bool Enable(Error &error);
 	void Disable();
@@ -175,35 +175,35 @@ private:
 static constexpr Domain alsa_output_domain("alsa_output");
 
 inline bool
-AlsaOutput::Configure(const config_param &param, Error &error)
+AlsaOutput::Configure(const ConfigBlock &block, Error &error)
 {
-	if (!base.Configure(param, error))
+	if (!base.Configure(block, error))
 		return false;
 
-	device = param.GetBlockValue("device", "");
+	device = block.GetBlockValue("device", "");
 
-	use_mmap = param.GetBlockValue("use_mmap", false);
+	use_mmap = block.GetBlockValue("use_mmap", false);
 
-	dop = param.GetBlockValue("dop", false) ||
+	dop = block.GetBlockValue("dop", false) ||
 		/* legacy name from MPD 0.18 and older: */
-		param.GetBlockValue("dsd_usb", false);
+		block.GetBlockValue("dsd_usb", false);
 
-	buffer_time = param.GetBlockValue("buffer_time",
+	buffer_time = block.GetBlockValue("buffer_time",
 					      MPD_ALSA_BUFFER_TIME_US);
-	period_time = param.GetBlockValue("period_time", 0u);
+	period_time = block.GetBlockValue("period_time", 0u);
 
 #ifdef SND_PCM_NO_AUTO_RESAMPLE
-	if (!param.GetBlockValue("auto_resample", true))
+	if (!block.GetBlockValue("auto_resample", true))
 		mode |= SND_PCM_NO_AUTO_RESAMPLE;
 #endif
 
 #ifdef SND_PCM_NO_AUTO_CHANNELS
-	if (!param.GetBlockValue("auto_channels", true))
+	if (!block.GetBlockValue("auto_channels", true))
 		mode |= SND_PCM_NO_AUTO_CHANNELS;
 #endif
 
 #ifdef SND_PCM_NO_AUTO_FORMAT
-	if (!param.GetBlockValue("auto_format", true))
+	if (!block.GetBlockValue("auto_format", true))
 		mode |= SND_PCM_NO_AUTO_FORMAT;
 #endif
 
@@ -211,11 +211,11 @@ AlsaOutput::Configure(const config_param &param, Error &error)
 }
 
 inline AlsaOutput *
-AlsaOutput::Create(const config_param &param, Error &error)
+AlsaOutput::Create(const ConfigBlock &block, Error &error)
 {
 	AlsaOutput *ad = new AlsaOutput();
 
-	if (!ad->Configure(param, error)) {
+	if (!ad->Configure(block, error)) {
 		delete ad;
 		return nullptr;
 	}

src/output/plugins/AoOutputPlugin.cxx

@@ -46,11 +46,11 @@ struct AoOutput {
 	AoOutput()
 		:base(ao_output_plugin) {}
 
-	bool Initialize(const config_param &param, Error &error) {
-		return base.Configure(param, error);
+	bool Initialize(const ConfigBlock &block, Error &error) {
+		return base.Configure(block, error);
 	}
 
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 };
 
 static constexpr Domain ao_output_domain("ao_output");
@@ -90,20 +90,20 @@ ao_output_error(Error &error_r)
 }
 
 inline bool
-AoOutput::Configure(const config_param &param, Error &error)
+AoOutput::Configure(const ConfigBlock &block, Error &error)
 {
 	const char *value;
 
 	options = nullptr;
 
-	write_size = param.GetBlockValue("write_size", 1024u);
+	write_size = block.GetBlockValue("write_size", 1024u);
 
 	if (ao_output_ref == 0) {
 		ao_initialize();
 	}
 	ao_output_ref++;
 
-	value = param.GetBlockValue("driver", "default");
+	value = block.GetBlockValue("driver", "default");
 	if (0 == strcmp(value, "default"))
 		driver = ao_default_driver_id();
 	else
@@ -123,9 +123,9 @@ AoOutput::Configure(const config_param &param, Error &error)
 	}
 
 	FormatDebug(ao_output_domain, "using ao driver \"%s\" for \"%s\"\n",
-		    ai->short_name, param.GetBlockValue("name", nullptr));
+		    ai->short_name, block.GetBlockValue("name", nullptr));
 
-	value = param.GetBlockValue("options", nullptr);
+	value = block.GetBlockValue("options", nullptr);
 	if (value != nullptr) {
 		for (const auto &i : SplitString(value, ';')) {
 			const DivideString ss(i.c_str(), '=', true);
@@ -145,16 +145,16 @@ AoOutput::Configure(const config_param &param, Error &error)
 }
 
 static AudioOutput *
-ao_output_init(const config_param &param, Error &error)
+ao_output_init(const ConfigBlock &block, Error &error)
 {
 	AoOutput *ad = new AoOutput();
 
-	if (!ad->Initialize(param, error)) {
+	if (!ad->Initialize(block, error)) {
 		delete ad;
 		return nullptr;
 	}
 
-	if (!ad->Configure(param, error)) {
+	if (!ad->Configure(block, error)) {
 		delete ad;
 		return nullptr;
 	}

src/output/plugins/FifoOutputPlugin.cxx

@@ -51,8 +51,8 @@ struct FifoOutput {
 		 path(AllocatedPath::Null()), input(-1), output(-1),
 		 created(false) {}
 
-	bool Initialize(const config_param &param, Error &error) {
-		return base.Configure(param, error);
+	bool Initialize(const ConfigBlock &block, Error &error) {
+		return base.Configure(block, error);
 	}
 
 	bool Create(Error &error);
@@ -169,11 +169,11 @@ fifo_open(FifoOutput *fd, Error &error)
 }
 
 static AudioOutput *
-fifo_output_init(const config_param &param, Error &error)
+fifo_output_init(const ConfigBlock &block, Error &error)
 {
 	FifoOutput *fd = new FifoOutput();
 
-	fd->path = param.GetBlockPath("path", error);
+	fd->path = block.GetBlockPath("path", error);
 	if (fd->path.IsNull()) {
 		delete fd;
 
@@ -185,7 +185,7 @@ fifo_output_init(const config_param &param, Error &error)
 
 	fd->path_utf8 = fd->path.ToUTF8();
 
-	if (!fd->Initialize(param, error)) {
+	if (!fd->Initialize(block, error)) {
 		delete fd;
 		return nullptr;
 	}

src/output/plugins/JackOutputPlugin.cxx

@@ -83,7 +83,7 @@ struct JackOutput {
 	JackOutput()
 		:base(jack_output_plugin) {}
 
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 
 	bool Connect(Error &error);
 
@@ -376,14 +376,14 @@ parse_port_list(const char *source, std::string dest[], Error &error)
 }
 
 bool
-JackOutput::Configure(const config_param &param, Error &error)
+JackOutput::Configure(const ConfigBlock &block, Error &error)
 {
-	if (!base.Configure(param, error))
+	if (!base.Configure(block, error))
 		return false;
 
 	options = JackNullOption;
 
-	name = param.GetBlockValue("client_name", nullptr);
+	name = block.GetBlockValue("client_name", nullptr);
 	if (name != nullptr)
 		options = jack_options_t(options | JackUseExactName);
 	else
@@ -391,30 +391,30 @@ JackOutput::Configure(const config_param &param, Error &error)
 		   care about the JackUseExactName option */
 		name = "Music Player Daemon";
 
-	server_name = param.GetBlockValue("server_name", nullptr);
+	server_name = block.GetBlockValue("server_name", nullptr);
 	if (server_name != nullptr)
 		options = jack_options_t(options | JackServerName);
 
-	if (!param.GetBlockValue("autostart", false))
+	if (!block.GetBlockValue("autostart", false))
 		options = jack_options_t(options | JackNoStartServer);
 
 	/* configure the source ports */
 
-	const char *value = param.GetBlockValue("source_ports", "left,right");
+	const char *value = block.GetBlockValue("source_ports", "left,right");
 	num_source_ports = parse_port_list(value, source_ports, error);
 	if (num_source_ports == 0)
 		return false;
 
 	/* configure the destination ports */
 
-	value = param.GetBlockValue("destination_ports", nullptr);
+	value = block.GetBlockValue("destination_ports", nullptr);
 	if (value == nullptr) {
 		/* compatibility with MPD < 0.16 */
-		value = param.GetBlockValue("ports", nullptr);
+		value = block.GetBlockValue("ports", nullptr);
 		if (value != nullptr)
 			FormatWarning(jack_output_domain,
 				      "deprecated option 'ports' in line %d",
-				      param.line);
+				      block.line);
 	}
 
 	if (value != nullptr) {
@@ -432,9 +432,9 @@ JackOutput::Configure(const config_param &param, Error &error)
 			      "number of source ports (%u) mismatches the "
 			      "number of destination ports (%u) in line %d",
 			      num_source_ports, num_destination_ports,
-			      param.line);
+			      block.line);
 
-	ringbuffer_size = param.GetBlockValue("ringbuffer_size", 32768u);
+	ringbuffer_size = block.GetBlockValue("ringbuffer_size", 32768u);
 
 	return true;
 }
@@ -463,11 +463,11 @@ JackOutput::Disable()
 }
 
 static AudioOutput *
-mpd_jack_init(const config_param &param, Error &error)
+mpd_jack_init(const ConfigBlock &block, Error &error)
 {
 	JackOutput *jd = new JackOutput();
 
-	if (!jd->Configure(param, error)) {
+	if (!jd->Configure(block, error)) {
 		delete jd;
 		return nullptr;
 	}

src/output/plugins/NullOutputPlugin.cxx

@@ -36,11 +36,11 @@ public:
 	NullOutput()
 		:base(null_output_plugin) {}
 
-	bool Initialize(const config_param &param, Error &error) {
-		return base.Configure(param, error);
+	bool Initialize(const ConfigBlock &block, Error &error) {
+		return base.Configure(block, error);
 	}
 
-	static NullOutput *Create(const config_param &param, Error &error);
+	static NullOutput *Create(const ConfigBlock &block, Error &error);
 
 	bool Open(AudioFormat &audio_format, gcc_unused Error &error) {
 		if (sync)
@@ -78,16 +78,16 @@ public:
 };
 
 inline NullOutput *
-NullOutput::Create(const config_param &param, Error &error)
+NullOutput::Create(const ConfigBlock &block, Error &error)
 {
 	NullOutput *nd = new NullOutput();
 
-	if (!nd->Initialize(param, error)) {
+	if (!nd->Initialize(block, error)) {
 		delete nd;
 		return nullptr;
 	}
 
-	nd->sync = param.GetBlockValue("sync", true);
+	nd->sync = block.GetBlockValue("sync", true);
 
 	return nd;
 }

src/output/plugins/OSXOutputPlugin.cxx

@@ -61,9 +61,9 @@ osx_output_test_default_device(void)
 }
 
 static void
-osx_output_configure(OSXOutput *oo, const config_param &param)
+osx_output_configure(OSXOutput *oo, const ConfigBlock &block)
 {
-	const char *device = param.GetBlockValue("device");
+	const char *device = block.GetBlockValue("device");
 
 	if (device == nullptr || 0 == strcmp(device, "default")) {
 		oo->component_subtype = kAudioUnitSubType_DefaultOutput;
@@ -81,15 +81,15 @@ osx_output_configure(OSXOutput *oo, const config_param &param)
 }
 
 static AudioOutput *
-osx_output_init(const config_param &param, Error &error)
+osx_output_init(const ConfigBlock &block, Error &error)
 {
 	OSXOutput *oo = new OSXOutput();
-	if (!oo->base.Configure(param, error)) {
+	if (!oo->base.Configure(block, error)) {
 		delete oo;
 		return nullptr;
 	}
 
-	osx_output_configure(oo, param);
+	osx_output_configure(oo, block);
 
 	return &oo->base;
 }

src/output/plugins/OpenALOutputPlugin.cxx

@@ -54,9 +54,9 @@ class OpenALOutput {
 	OpenALOutput()
 		:base(openal_output_plugin) {}
 
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 
-	static OpenALOutput *Create(const config_param &param, Error &error);
+	static OpenALOutput *Create(const ConfigBlock &block, Error &error);
 
 	bool Open(AudioFormat &audio_format, Error &error);
 
@@ -150,12 +150,12 @@ OpenALOutput::SetupContext(Error &error)
 }
 
 inline bool
-OpenALOutput::Configure(const config_param &param, Error &error)
+OpenALOutput::Configure(const ConfigBlock &block, Error &error)
 {
-	if (!base.Configure(param, error))
+	if (!base.Configure(block, error))
 		return false;
 
-	device_name = param.GetBlockValue("device");
+	device_name = block.GetBlockValue("device");
 	if (device_name == nullptr)
 		device_name = alcGetString(nullptr,
 					   ALC_DEFAULT_DEVICE_SPECIFIER);
@@ -164,11 +164,11 @@ OpenALOutput::Configure(const config_param &param, Error &error)
 }
 
 inline OpenALOutput *
-OpenALOutput::Create(const config_param &param, Error &error)
+OpenALOutput::Create(const ConfigBlock &block, Error &error)
 {
 	OpenALOutput *oo = new OpenALOutput();
 
-	if (!oo->Configure(param, error)) {
+	if (!oo->Configure(block, error)) {
 		delete oo;
 		return nullptr;
 	}

src/output/plugins/OssOutputPlugin.cxx

@@ -87,11 +87,11 @@ public:
 		:base(oss_output_plugin),
 		 fd(-1), device(_device) {}
 
-	bool Initialize(const config_param &param, Error &error_r) {
-		return base.Configure(param, error_r);
+	bool Initialize(const ConfigBlock &block, Error &error_r) {
+		return base.Configure(block, error_r);
 	}
 
-	static OssOutput *Create(const config_param &param, Error &error);
+	static OssOutput *Create(const ConfigBlock &block, Error &error);
 
 #ifdef AFMT_S24_PACKED
 	bool Enable(gcc_unused Error &error) {
@@ -192,7 +192,7 @@ oss_open_default(Error &error)
 	int err[ARRAY_SIZE(default_devices)];
 	enum oss_stat ret[ARRAY_SIZE(default_devices)];
 
-	const config_param empty;
+	const ConfigBlock empty;
 	for (int i = ARRAY_SIZE(default_devices); --i >= 0; ) {
 		ret[i] = oss_stat_device(default_devices[i], &err[i]);
 		if (ret[i] == OSS_STAT_NO_ERROR) {
@@ -236,12 +236,12 @@ oss_open_default(Error &error)
 }
 
 inline OssOutput *
-OssOutput::Create(const config_param &param, Error &error)
+OssOutput::Create(const ConfigBlock &block, Error &error)
 {
-	const char *device = param.GetBlockValue("device");
+	const char *device = block.GetBlockValue("device");
 	if (device != nullptr) {
 		OssOutput *od = new OssOutput();
-		if (!od->Initialize(param, error)) {
+		if (!od->Initialize(block, error)) {
 			delete od;
 			return nullptr;
 		}

src/output/plugins/PipeOutputPlugin.cxx

@@ -40,10 +40,10 @@ class PipeOutput {
 	PipeOutput()
 		:base(pipe_output_plugin) {}
 
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 
 public:
-	static PipeOutput *Create(const config_param &param, Error &error);
+	static PipeOutput *Create(const ConfigBlock &block, Error &error);
 
 	bool Open(AudioFormat &audio_format, Error &error);
 
@@ -58,12 +58,12 @@ public:
 static constexpr Domain pipe_output_domain("pipe_output");
 
 inline bool
-PipeOutput::Configure(const config_param &param, Error &error)
+PipeOutput::Configure(const ConfigBlock &block, Error &error)
 {
-	if (!base.Configure(param, error))
+	if (!base.Configure(block, error))
 		return false;
 
-	cmd = param.GetBlockValue("command", "");
+	cmd = block.GetBlockValue("command", "");
 	if (cmd.empty()) {
 		error.Set(config_domain,
 			  "No \"command\" parameter specified");
@@ -74,11 +74,11 @@ PipeOutput::Configure(const config_param &param, Error &error)
 }
 
 inline PipeOutput *
-PipeOutput::Create(const config_param &param, Error &error)
+PipeOutput::Create(const ConfigBlock &block, Error &error)
 {
 	PipeOutput *po = new PipeOutput();
 
-	if (!po->Configure(param, error)) {
+	if (!po->Configure(block, error)) {
 		delete po;
 		return nullptr;
 	}

src/output/plugins/PulseOutputPlugin.cxx

@@ -98,8 +98,8 @@ public:
 	gcc_const
 	static bool TestDefaultDevice();
 
-	bool Configure(const config_param &param, Error &error);
-	static PulseOutput *Create(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
+	static PulseOutput *Create(const ConfigBlock &block, Error &error);
 
 	bool Enable(Error &error);
 	void Disable();
@@ -430,26 +430,26 @@ PulseOutput::SetupContext(Error &error)
 }
 
 inline bool
-PulseOutput::Configure(const config_param &param, Error &error)
+PulseOutput::Configure(const ConfigBlock &block, Error &error)
 {
-	if (!base.Configure(param, error))
+	if (!base.Configure(block, error))
 		return false;
 
-	name = param.GetBlockValue("name", "mpd_pulse");
-	server = param.GetBlockValue("server");
-	sink = param.GetBlockValue("sink");
+	name = block.GetBlockValue("name", "mpd_pulse");
+	server = block.GetBlockValue("server");
+	sink = block.GetBlockValue("sink");
 
 	return true;
 }
 
 PulseOutput *
-PulseOutput::Create(const config_param &param, Error &error)
+PulseOutput::Create(const ConfigBlock &block, Error &error)
 {
 	setenv("PULSE_PROP_media.role", "music", true);
 	setenv("PULSE_PROP_application.icon_name", "mpd", true);
 
 	auto *po = new PulseOutput();
-	if (!po->Configure(param, error)) {
+	if (!po->Configure(block, error)) {
 		delete po;
 		return nullptr;
 	}
@@ -926,7 +926,7 @@ PulseOutput::Pause()
 inline bool
 PulseOutput::TestDefaultDevice()
 {
-	const config_param empty;
+	const ConfigBlock empty;
 	PulseOutput *po = PulseOutput::Create(empty, IgnoreError());
 	if (po == nullptr)
 		return false;

src/output/plugins/RecorderOutputPlugin.cxx

@@ -81,13 +81,13 @@ class RecorderOutput {
 			encoder->Dispose();
 	}
 
-	bool Initialize(const config_param &param, Error &error_r) {
-		return base.Configure(param, error_r);
+	bool Initialize(const ConfigBlock &block, Error &error_r) {
+		return base.Configure(block, error_r);
 	}
 
-	static RecorderOutput *Create(const config_param &param, Error &error);
+	static RecorderOutput *Create(const ConfigBlock &block, Error &error);
 
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 
 	bool Open(AudioFormat &audio_format, Error &error);
 	void Close();
@@ -117,12 +117,12 @@ private:
 };
 
 inline bool
-RecorderOutput::Configure(const config_param &param, Error &error)
+RecorderOutput::Configure(const ConfigBlock &block, Error &error)
 {
 	/* read configuration */
 
 	const char *encoder_name =
-		param.GetBlockValue("encoder", "vorbis");
+		block.GetBlockValue("encoder", "vorbis");
 	const auto encoder_plugin = encoder_plugin_get(encoder_name);
 	if (encoder_plugin == nullptr) {
 		error.Format(config_domain,
@@ -130,11 +130,11 @@ RecorderOutput::Configure(const config_param &param, Error &error)
 		return false;
 	}
 
-	path = param.GetBlockPath("path", error);
+	path = block.GetBlockPath("path", error);
 	if (error.IsDefined())
 		return false;
 
-	const char *fmt = param.GetBlockValue("format_path", nullptr);
+	const char *fmt = block.GetBlockValue("format_path", nullptr);
 	if (fmt != nullptr)
 		format_path = fmt;
 
@@ -150,7 +150,7 @@ RecorderOutput::Configure(const config_param &param, Error &error)
 
 	/* initialize encoder */
 
-	encoder = encoder_init(*encoder_plugin, param, error);
+	encoder = encoder_init(*encoder_plugin, block, error);
 	if (encoder == nullptr)
 		return false;
 
@@ -158,16 +158,16 @@ RecorderOutput::Configure(const config_param &param, Error &error)
 }
 
 RecorderOutput *
-RecorderOutput::Create(const config_param &param, Error &error)
+RecorderOutput::Create(const ConfigBlock &block, Error &error)
 {
 	RecorderOutput *recorder = new RecorderOutput();
 
-	if (!recorder->Initialize(param, error)) {
+	if (!recorder->Initialize(block, error)) {
 		delete recorder;
 		return nullptr;
 	}
 
-	if (!recorder->Configure(param, error)) {
+	if (!recorder->Configure(block, error)) {
 		delete recorder;
 		return nullptr;
 	}

src/output/plugins/RoarOutputPlugin.cxx

@@ -60,11 +60,11 @@ public:
 		return &base;
 	}
 
-	bool Initialize(const config_param &param, Error &error) {
-		return base.Configure(param, error);
+	bool Initialize(const ConfigBlock &block, Error &error) {
+		return base.Configure(block, error);
 	}
 
-	void Configure(const config_param &param);
+	void Configure(const ConfigBlock &block);
 
 	bool Open(AudioFormat &audio_format, Error &error);
 	void Close();
@@ -124,28 +124,28 @@ roar_output_set_volume(RoarOutput &roar, unsigned volume)
 }
 
 inline void
-RoarOutput::Configure(const config_param &param)
+RoarOutput::Configure(const ConfigBlock &block)
 {
-	host = param.GetBlockValue("server", "");
-	name = param.GetBlockValue("name", "MPD");
+	host = block.GetBlockValue("server", "");
+	name = block.GetBlockValue("name", "MPD");
 
-	const char *_role = param.GetBlockValue("role", "music");
+	const char *_role = block.GetBlockValue("role", "music");
 	role = _role != nullptr
 		? roar_str2role(_role)
 		: ROAR_ROLE_MUSIC;
 }
 
 static AudioOutput *
-roar_init(const config_param &param, Error &error)
+roar_init(const ConfigBlock &block, Error &error)
 {
 	RoarOutput *self = new RoarOutput();
 
-	if (!self->Initialize(param, error)) {
+	if (!self->Initialize(block, error)) {
 		delete self;
 		return nullptr;
 	}
 
-	self->Configure(param);
+	self->Configure(block);
 	return *self;
 }
 

src/output/plugins/ShoutOutputPlugin.cxx

@@ -68,11 +68,11 @@ struct ShoutOutput final {
 			shout_free(shout_conn);
 	}
 
-	bool Initialize(const config_param &param, Error &error) {
-		return base.Configure(param, error);
+	bool Initialize(const ConfigBlock &block, Error &error) {
+		return base.Configure(block, error);
 	}
 
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 };
 
 static int shout_init_count;
@@ -92,18 +92,18 @@ shout_encoder_plugin_get(const char *name)
 
 gcc_pure
 static const char *
-require_block_string(const config_param &param, const char *name)
+require_block_string(const ConfigBlock &block, const char *name)
 {
-	const char *value = param.GetBlockValue(name);
+	const char *value = block.GetBlockValue(name);
 	if (value == nullptr)
 		FormatFatalError("no \"%s\" defined for shout device defined "
-				 "at line %d\n", name, param.line);
+				 "at line %d\n", name, block.line);
 
 	return value;
 }
 
 inline bool
-ShoutOutput::Configure(const config_param &param, Error &error)
+ShoutOutput::Configure(const ConfigBlock &block, Error &error)
 {
 
 	const AudioFormat audio_format = base.config_audio_format;
@@ -113,22 +113,22 @@ ShoutOutput::Configure(const config_param &param, Error &error)
 		return false;
 	}
 
-	const char *host = require_block_string(param, "host");
-	const char *mount = require_block_string(param, "mount");
-	unsigned port = param.GetBlockValue("port", 0u);
+	const char *host = require_block_string(block, "host");
+	const char *mount = require_block_string(block, "mount");
+	unsigned port = block.GetBlockValue("port", 0u);
 	if (port == 0) {
 		error.Set(config_domain, "shout port must be configured");
 		return false;
 	}
 
-	const char *passwd = require_block_string(param, "password");
-	const char *name = require_block_string(param, "name");
+	const char *passwd = require_block_string(block, "password");
+	const char *name = require_block_string(block, "name");
 
-	bool is_public = param.GetBlockValue("public", false);
+	bool is_public = block.GetBlockValue("public", false);
 
-	const char *user = param.GetBlockValue("user", "source");
+	const char *user = block.GetBlockValue("user", "source");
 
-	const char *value = param.GetBlockValue("quality");
+	const char *value = block.GetBlockValue("quality");
 	if (value != nullptr) {
 		char *test;
 		quality = strtod(value, &test);
@@ -141,14 +141,14 @@ ShoutOutput::Configure(const config_param &param, Error &error)
 			return false;
 		}
 
-		if (param.GetBlockValue("bitrate") != nullptr) {
+		if (block.GetBlockValue("bitrate") != nullptr) {
 			error.Set(config_domain,
 				  "quality and bitrate are "
 				  "both defined");
 			return false;
 		}
 	} else {
-		value = param.GetBlockValue("bitrate");
+		value = block.GetBlockValue("bitrate");
 		if (value == nullptr) {
 			error.Set(config_domain,
 				  "neither bitrate nor quality defined");
@@ -165,7 +165,7 @@ ShoutOutput::Configure(const config_param &param, Error &error)
 		}
 	}
 
-	const char *encoding = param.GetBlockValue("encoding", "ogg");
+	const char *encoding = block.GetBlockValue("encoding", "ogg");
 	const auto encoder_plugin = shout_encoder_plugin_get(encoding);
 	if (encoder_plugin == nullptr) {
 		error.Format(config_domain,
@@ -174,7 +174,7 @@ ShoutOutput::Configure(const config_param &param, Error &error)
 		return false;
 	}
 
-	encoder = encoder_init(*encoder_plugin, param, error);
+	encoder = encoder_init(*encoder_plugin, block, error);
 	if (encoder == nullptr)
 		return false;
 
@@ -185,7 +185,7 @@ ShoutOutput::Configure(const config_param &param, Error &error)
 		shout_format = SHOUT_FORMAT_OGG;
 
 	unsigned protocol;
-	value = param.GetBlockValue("protocol");
+	value = block.GetBlockValue("protocol");
 	if (value != nullptr) {
 		if (0 == strcmp(value, "shoutcast") &&
 		    0 != strcmp(encoding, "mp3")) {
@@ -226,21 +226,21 @@ ShoutOutput::Configure(const config_param &param, Error &error)
 	}
 
 	/* optional paramters */
-	timeout = param.GetBlockValue("timeout", DEFAULT_CONN_TIMEOUT);
+	timeout = block.GetBlockValue("timeout", DEFAULT_CONN_TIMEOUT);
 
-	value = param.GetBlockValue("genre");
+	value = block.GetBlockValue("genre");
 	if (value != nullptr && shout_set_genre(shout_conn, value)) {
 		error.Set(shout_output_domain, shout_get_error(shout_conn));
 		return false;
 	}
 
-	value = param.GetBlockValue("description");
+	value = block.GetBlockValue("description");
 	if (value != nullptr && shout_set_description(shout_conn, value)) {
 		error.Set(shout_output_domain, shout_get_error(shout_conn));
 		return false;
 	}
 
-	value = param.GetBlockValue("url");
+	value = block.GetBlockValue("url");
 	if (value != nullptr && shout_set_url(shout_conn, value)) {
 		error.Set(shout_output_domain, shout_get_error(shout_conn));
 		return false;
@@ -272,15 +272,15 @@ ShoutOutput::Configure(const config_param &param, Error &error)
 }
 
 static AudioOutput *
-my_shout_init_driver(const config_param &param, Error &error)
+my_shout_init_driver(const ConfigBlock &block, Error &error)
 {
 	ShoutOutput *sd = new ShoutOutput();
-	if (!sd->Initialize(param, error)) {
+	if (!sd->Initialize(block, error)) {
 		delete sd;
 		return nullptr;
 	}
 
-	if (!sd->Configure(param, error)) {
+	if (!sd->Configure(block, error)) {
 		delete sd;
 		return nullptr;
 	}

src/output/plugins/SolarisOutputPlugin.cxx

@@ -60,8 +60,8 @@ struct SolarisOutput {
 	SolarisOutput()
 		:base(solaris_output_plugin) {}
 
-	bool Initialize(const config_param &param, Error &error_r) {
-		return base.Configure(param, error_r);
+	bool Initialize(const ConfigBlock &block, Error &error_r) {
+		return base.Configure(block, error_r);
 	}
 };
 
@@ -75,15 +75,15 @@ solaris_output_test_default_device(void)
 }
 
 static AudioOutput *
-solaris_output_init(const config_param &param, Error &error_r)
+solaris_output_init(const ConfigBlock &block, Error &error_r)
 {
 	SolarisOutput *so = new SolarisOutput();
-	if (!so->Initialize(param, error_r)) {
+	if (!so->Initialize(block, error_r)) {
 		delete so;
 		return nullptr;
 	}
 
-	so->device = param.GetBlockValue("device", "/dev/audio");
+	so->device = block.GetBlockValue("device", "/dev/audio");
 
 	return &so->base;
 }

src/output/plugins/WinmmOutputPlugin.cxx

@@ -122,15 +122,15 @@ fail:
 }
 
 static AudioOutput *
-winmm_output_init(const config_param &param, Error &error)
+winmm_output_init(const ConfigBlock &block, Error &error)
 {
 	WinmmOutput *wo = new WinmmOutput();
-	if (!wo->base.Configure(param, error)) {
+	if (!wo->base.Configure(block, error)) {
 		delete wo;
 		return nullptr;
 	}
 
-	const char *device = param.GetBlockValue("device");
+	const char *device = block.GetBlockValue("device");
 	if (!get_device_id(device, &wo->device_id, error)) {
 		delete wo;
 		return nullptr;

src/output/plugins/httpd/HttpdInternal.hxx

@@ -42,7 +42,7 @@
 #include <queue>
 #include <list>
 
-struct config_param;
+struct ConfigBlock;
 class Error;
 class EventLoop;
 class ServerSocket;
@@ -162,16 +162,16 @@ public:
 
 	using DeferredMonitor::GetEventLoop;
 
-	bool Init(const config_param &param, Error &error);
+	bool Init(const ConfigBlock &block, Error &error);
 
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 
-	AudioOutput *InitAndConfigure(const config_param &param,
+	AudioOutput *InitAndConfigure(const ConfigBlock &block,
 				       Error &error) {
-		if (!Init(param, error))
+		if (!Init(block, error))
 			return nullptr;
 
-		if (!Configure(param, error))
+		if (!Configure(block, error))
 			return nullptr;
 
 		return &base;

src/output/plugins/httpd/HttpdOutputPlugin.cxx

@@ -91,17 +91,17 @@ HttpdOutput::Unbind()
 }
 
 inline bool
-HttpdOutput::Configure(const config_param &param, Error &error)
+HttpdOutput::Configure(const ConfigBlock &block, Error &error)
 {
 	/* read configuration */
-	name = param.GetBlockValue("name", "Set name in config");
-	genre = param.GetBlockValue("genre", "Set genre in config");
-	website = param.GetBlockValue("website", "Set website in config");
+	name = block.GetBlockValue("name", "Set name in config");
+	genre = block.GetBlockValue("genre", "Set genre in config");
+	website = block.GetBlockValue("website", "Set website in config");
 
-	unsigned port = param.GetBlockValue("port", 8000u);
+	unsigned port = block.GetBlockValue("port", 8000u);
 
 	const char *encoder_name =
-		param.GetBlockValue("encoder", "vorbis");
+		block.GetBlockValue("encoder", "vorbis");
 	const auto encoder_plugin = encoder_plugin_get(encoder_name);
 	if (encoder_plugin == nullptr) {
 		error.Format(httpd_output_domain,
@@ -109,11 +109,11 @@ HttpdOutput::Configure(const config_param &param, Error &error)
 		return false;
 	}
 
-	clients_max = param.GetBlockValue("max_clients", 0u);
+	clients_max = block.GetBlockValue("max_clients", 0u);
 
 	/* set up bind_to_address */
 
-	const char *bind_to_address = param.GetBlockValue("bind_to_address");
+	const char *bind_to_address = block.GetBlockValue("bind_to_address");
 	bool success = bind_to_address != nullptr &&
 		strcmp(bind_to_address, "any") != 0
 		? AddHost(bind_to_address, port, error)
@@ -123,7 +123,7 @@ HttpdOutput::Configure(const config_param &param, Error &error)
 
 	/* initialize encoder */
 
-	encoder = encoder_init(*encoder_plugin, param, error);
+	encoder = encoder_init(*encoder_plugin, block, error);
 	if (encoder == nullptr)
 		return false;
 
@@ -136,17 +136,17 @@ HttpdOutput::Configure(const config_param &param, Error &error)
 }
 
 inline bool
-HttpdOutput::Init(const config_param &param, Error &error)
+HttpdOutput::Init(const ConfigBlock &block, Error &error)
 {
-	return base.Configure(param, error);
+	return base.Configure(block, error);
 }
 
 static AudioOutput *
-httpd_output_init(const config_param &param, Error &error)
+httpd_output_init(const ConfigBlock &block, Error &error)
 {
 	HttpdOutput *httpd = new HttpdOutput(io_thread_get());
 
-	AudioOutput *result = httpd->InitAndConfigure(param, error);
+	AudioOutput *result = httpd->InitAndConfigure(block, error);
 	if (result == nullptr)
 		delete httpd;
 

src/output/plugins/sles/SlesOutputPlugin.cxx

@@ -91,11 +91,11 @@ public:
 		return &base;
 	}
 
-	bool Initialize(const config_param &param, Error &error) {
-		return base.Configure(param, error);
+	bool Initialize(const ConfigBlock &block, Error &error) {
+		return base.Configure(block, error);
 	}
 
-	bool Configure(const config_param &param, Error &error);
+	bool Configure(const ConfigBlock &block, Error &error);
 
 	bool Open(AudioFormat &audio_format, Error &error);
 	void Close();
@@ -129,7 +129,7 @@ private:
 static constexpr Domain sles_domain("sles");
 
 inline bool
-SlesOutput::Configure(const config_param &, Error &)
+SlesOutput::Configure(const ConfigBlock &, Error &)
 {
 	return true;
 }
@@ -445,12 +445,12 @@ sles_test_default_device()
 }
 
 static AudioOutput *
-sles_output_init(const config_param &param, Error &error)
+sles_output_init(const ConfigBlock &block, Error &error)
 {
 	SlesOutput *sles = new SlesOutput();
 
-	if (!sles->Initialize(param, error) ||
-	    !sles->Configure(param, error)) {
+	if (!sles->Initialize(block, error) ||
+	    !sles->Configure(block, error)) {
 		delete sles;
 		return nullptr;
 	}

src/playlist/PlaylistPlugin.hxx

@@ -20,7 +20,7 @@
 #ifndef MPD_PLAYLIST_PLUGIN_HXX
 #define MPD_PLAYLIST_PLUGIN_HXX
 
-struct config_param;
+struct ConfigBlock;
 class InputStream;
 struct Tag;
 class Mutex;
@@ -38,7 +38,7 @@ struct playlist_plugin {
 	 * @return true if the plugin was initialized successfully,
 	 * false if the plugin is not available
 	 */
-	bool (*init)(const config_param &param);
+	bool (*init)(const ConfigBlock &block);
 
 	/**
 	 * Deinitialize a plugin which was initialized successfully.
@@ -75,10 +75,10 @@ struct playlist_plugin {
  */
 static inline bool
 playlist_plugin_init(const struct playlist_plugin *plugin,
-		     const config_param &param)
+		     const ConfigBlock &block)
 {
 	return plugin->init != nullptr
-		? plugin->init(param)
+		? plugin->init(block)
 		: true;
 }
 

src/playlist/PlaylistRegistry.cxx

@@ -36,7 +36,7 @@
 #include "util/Error.hxx"
 #include "util/Macros.hxx"
 #include "config/ConfigGlobal.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "Log.hxx"
 
 #include <assert.h>
@@ -77,12 +77,12 @@ static bool playlist_plugins_enabled[n_playlist_plugins];
 void
 playlist_list_global_init(void)
 {
-	const config_param empty;
+	const ConfigBlock empty;
 
 	for (unsigned i = 0; playlist_plugins[i] != nullptr; ++i) {
 		const struct playlist_plugin *plugin = playlist_plugins[i];
 		const auto *param =
-			config_find_block(ConfigOption::PLAYLIST_PLUGIN,
+			config_find_block(ConfigBlockOption::PLAYLIST_PLUGIN,
 					  "name", plugin->name);
 		if (param == nullptr)
 			param = &empty;

src/playlist/plugins/SoundCloudPlaylistPlugin.cxx

@@ -21,7 +21,7 @@
 #include "SoundCloudPlaylistPlugin.hxx"
 #include "../PlaylistPlugin.hxx"
 #include "../MemorySongEnumerator.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "input/InputStream.hxx"
 #include "tag/TagBuilder.hxx"
 #include "util/StringUtil.hxx"
@@ -44,10 +44,10 @@ static struct {
 static constexpr Domain soundcloud_domain("soundcloud");
 
 static bool
-soundcloud_init(const config_param &param)
+soundcloud_init(const ConfigBlock &block)
 {
 	// APIKEY for MPD application, registered under DarkFox' account.
-	soundcloud_config.apikey = param.GetBlockValue("apikey", "a25e51780f7f86af0afa91f241d091f8");
+	soundcloud_config.apikey = block.GetBlockValue("apikey", "a25e51780f7f86af0afa91f241d091f8");
 	if (soundcloud_config.apikey.empty()) {
 		LogDebug(soundcloud_domain,
 			 "disabling the soundcloud playlist plugin "

test/DumpDatabase.cxx

@@ -28,6 +28,7 @@
 #include "db/PlaylistVector.hxx"
 #include "config/ConfigGlobal.hxx"
 #include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "tag/TagConfig.hxx"
 #include "fs/Path.hxx"
 #include "event/Loop.hxx"
@@ -121,12 +122,12 @@ main(int argc, char **argv)
 	/* do it */
 
 	const auto *path = config_get_param(ConfigOption::DB_FILE);
-	config_param param("database", path != nullptr ? path->line : -1);
+	ConfigBlock block(path != nullptr ? path->line : -1);
 	if (path != nullptr)
-		param.AddBlockParam("path", path->value.c_str(), path->line);
+		block.AddBlockParam("path", path->value.c_str(), path->line);
 
 	Database *db = plugin->create(event_loop, database_listener,
-				      param, error);
+				      block, error);
 
 	if (db == nullptr) {
 		cerr << error.GetMessage() << endl;

test/read_mixer.cxx

@@ -24,7 +24,7 @@
 #include "pcm/Volume.hxx"
 #include "Main.hxx"
 #include "event/Loop.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "util/Error.hxx"
 #include "Log.hxx"
 
@@ -54,7 +54,7 @@ int main(int argc, gcc_unused char **argv)
 	Mixer *mixer = mixer_new(event_loop, alsa_mixer_plugin,
 				 *(AudioOutput *)nullptr,
 				 *(MixerListener *)nullptr,
-				 config_param(), error);
+				 ConfigBlock(), error);
 	if (mixer == NULL) {
 		LogError(error, "mixer_new() failed");
 		return EXIT_FAILURE;

test/run_encoder.cxx

@@ -24,7 +24,7 @@
 #include "encoder/ToOutputStream.hxx"
 #include "AudioFormat.hxx"
 #include "AudioParser.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "fs/io/StdioOutputStream.hxx"
 #include "util/Error.hxx"
 #include "Log.hxx"
@@ -60,11 +60,11 @@ int main(int argc, char **argv)
 		return EXIT_FAILURE;
 	}
 
-	config_param param;
-	param.AddBlockParam("quality", "5.0", -1);
+	ConfigBlock block;
+	block.AddBlockParam("quality", "5.0", -1);
 
 	Error error;
-	const auto encoder = encoder_init(*plugin, param, error);
+	const auto encoder = encoder_init(*plugin, block, error);
 	if (encoder == NULL) {
 		LogError(error, "Failed to initialize encoder");
 		return EXIT_FAILURE;

test/run_filter.cxx

@@ -50,8 +50,8 @@ mixer_set_volume(gcc_unused Mixer *mixer,
 static Filter *
 load_filter(const char *name)
 {
-	const config_param *param =
-		config_find_block(ConfigOption::AUDIO_FILTER, "name", name);
+	const auto *param = config_find_block(ConfigBlockOption::AUDIO_FILTER,
+					      "name", name);
 	if (param == NULL) {
 		fprintf(stderr, "No such configured filter: %s\n", name);
 		return nullptr;

test/run_output.cxx

@@ -61,8 +61,8 @@ PlayerControl::~PlayerControl() {}
 static AudioOutput *
 load_audio_output(EventLoop &event_loop, const char *name)
 {
-	const config_param *param =
-		config_find_block(ConfigOption::AUDIO_OUTPUT, "name", name);
+	const auto *param = config_find_block(ConfigBlockOption::AUDIO_OUTPUT,
+					      "name", name);
 	if (param == NULL) {
 		fprintf(stderr, "No such configured audio output: %s\n", name);
 		return nullptr;

test/test_vorbis_encoder.cxx

@@ -23,7 +23,7 @@
 #include "encoder/EncoderInterface.hxx"
 #include "encoder/ToOutputStream.hxx"
 #include "AudioFormat.hxx"
-#include "config/Param.hxx"
+#include "config/Block.hxx"
 #include "fs/io/StdioOutputStream.hxx"
 #include "tag/Tag.hxx"
 #include "tag/TagBuilder.hxx"
@@ -45,10 +45,10 @@ main(gcc_unused int argc, gcc_unused char **argv)
 	const auto plugin = encoder_plugin_get("vorbis");
 	assert(plugin != NULL);
 
-	config_param param;
-	param.AddBlockParam("quality", "5.0", -1);
+	ConfigBlock block;
+	block.AddBlockParam("quality", "5.0", -1);
 
-	const auto encoder = encoder_init(*plugin, param, IgnoreError());
+	const auto encoder = encoder_init(*plugin, block, IgnoreError());
 	assert(encoder != NULL);
 
 	/* open the encoder */