ConfigData: use simple linked list instead of GSList

src/ConfigData.cxx

@@ -32,10 +32,11 @@ extern "C" {
 #include <stdlib.h>
 
 config_param::config_param(const char *_value, int _line)
-	:value(g_strdup(_value)), line(_line) {}
+	:next(nullptr), value(g_strdup(_value)), line(_line) {}
 
 config_param::~config_param()
 {
+	delete next;
 	g_free(value);
 }
 

src/ConfigData.hxx

@@ -25,7 +25,6 @@
 #include "gcc.h"
 
 #ifdef __cplusplus
-#include <glib.h>
 #include <string>
 #include <array>
 #include <vector>
@@ -54,6 +53,12 @@ struct block_param {
 #endif
 
 struct config_param {
+	/**
+	 * The next config_param with the same name.  The destructor
+	 * deletes the whole chain.
+	 */
+	struct config_param *next;
+
 	char *value;
 	unsigned int line;
 
@@ -67,7 +72,7 @@ struct config_param {
 	bool used;
 
 	config_param(int _line=-1)
-		:value(nullptr), line(_line), used(false) {}
+		:next(nullptr), value(nullptr), line(_line), used(false) {}
 
 	gcc_nonnull_all
 	config_param(const char *_value, int _line=-1);
@@ -92,7 +97,7 @@ struct config_param {
 #ifdef __cplusplus
 
 struct ConfigData {
-	std::array<GSList *, std::size_t(CONF_MAX)> params;
+	std::array<config_param *, std::size_t(CONF_MAX)> params;
 };
 
 #endif

src/ConfigFile.cxx

@@ -137,6 +137,19 @@ config_read_block(FILE *fp, int *count, char *string, GError **error_r)
 	}
 }
 
+gcc_nonnull_all
+static void
+Append(config_param *&head, config_param *p)
+{
+	assert(p->next == nullptr);
+
+	config_param **i = &head;
+	while (*i != nullptr)
+		i = &(*i)->next;
+
+	*i = p;
+}
+
 static bool
 ReadConfigFile(ConfigData &config_data, FILE *fp, GError **error_r)
 {
@@ -179,12 +192,12 @@ ReadConfigFile(ConfigData &config_data, FILE *fp, GError **error_r)
 			return false;
 		}
 
-		const unsigned i = ParseConfigOptionName(name);
+		const unsigned i = unsigned(o);
 		const ConfigTemplate &option = config_templates[i];
-		GSList *&params = config_data.params[i];
+		config_param *&head = config_data.params[i];
 
-		if (params != NULL && !option.repeatable) {
-			param = (struct config_param *)params->data;
+		if (head != nullptr && !option.repeatable) {
+			param = head;
 			g_set_error(error_r, config_quark(), 0,
 				    "config parameter \"%s\" is first defined "
 				    "on line %i and redefined on line %i\n",
@@ -244,7 +257,7 @@ ReadConfigFile(ConfigData &config_data, FILE *fp, GError **error_r)
 			param = new config_param(value, count);
 		}
 
-		params = g_slist_append(params, param);
+		Append(head, param);
 	}
 
 	return true;

src/ConfigGlobal.cxx

@@ -39,20 +39,10 @@ extern "C" {
 
 static ConfigData config_data;
 
-static void
-config_param_free_callback(gpointer data, G_GNUC_UNUSED gpointer user_data)
-{
-	struct config_param *param = (struct config_param *)data;
-
-	delete param;
-}
-
 void config_global_finish(void)
 {
-	for (auto i : config_data.params) {
-		g_slist_foreach(i, config_param_free_callback, NULL);
-		g_slist_free(i);
-	}
+	for (auto i : config_data.params)
+		delete i;
 }
 
 void config_global_init(void)
@@ -66,10 +56,8 @@ ReadConfigFile(const Path &path, GError **error_r)
 }
 
 static void
-config_param_check(gpointer data, G_GNUC_UNUSED gpointer user_data)
+Check(const config_param *param)
 {
-	struct config_param *param = (struct config_param *)data;
-
 	if (!param->used)
 		/* this whole config_param was not queried at all -
 		   the feature might be disabled at compile time?
@@ -86,27 +74,18 @@ config_param_check(gpointer data, G_GNUC_UNUSED gpointer user_data)
 void config_global_check(void)
 {
 	for (auto i : config_data.params)
-		g_slist_foreach(i, config_param_check, NULL);
+		for (const config_param *p = i; p != nullptr; p = p->next)
+			Check(p);
 }
 
 const struct config_param *
 config_get_next_param(ConfigOption option, const struct config_param * last)
 {
-	GSList *node = config_data.params[unsigned(option)];
-
-	if (last) {
-		node = g_slist_find(node, last);
-		if (node == NULL)
-			return NULL;
-
-		node = g_slist_next(node);
-	}
-
-	if (node == NULL)
-		return NULL;
-
-	struct config_param *param = (struct config_param *)node->data;
-	param->used = true;
+	config_param *param = last != nullptr
+		? last->next
+		: config_data.params[unsigned(option)];
+	if (param != nullptr)
+		param->used = true;
 	return param;
 }