libpurple/prefs.c

/*
 * Purple - Internet Messaging Library
 * Copyright (C) Pidgin Developers <devel@pidgin.im>
 *
 * Purple is the legal property of its developers, whose names are too numerous
 * to list here. Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this library; if not, see <https://www.gnu.org/licenses/>.
 */

#include <purpleconfig.h>

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>

#include <glib.h>

#include "prefs.h"
#include "debug.h"
#include "purplepath.h"
#include "util.h"
#ifdef _WIN32
#include "win32/win32dep.h"
#endif

struct _PurplePrefCallbackData {
	PurplePrefCallback func;
	gpointer data;
	guint id;
	void *handle;
	void *ui_data;
	char *name;
};

struct pref_cb {
	PurplePrefCallback func;
	gpointer data;
	guint id;
	void *handle;
	void *ui_data;
	char *name;
};

/* TODO: This should use PurpleValues? */
struct purple_pref {
	PurplePrefType type;
	char *name;
	union {
		/* 'generic' is kind of ugly. We use it as an elegant way to refer to
		   the value of this pref when calling callback functions. We could
		   use 'boolean' or 'integer' or any other field... but it feels
		   mildly cleaner to use a gpointer. Maybe it would be best to use a
		   GValue? */
		gpointer generic;
		gboolean boolean;
		int integer;
		char *string;
		GList *stringlist;
	} value;
	GSList *callbacks;
	struct purple_pref *parent;
	struct purple_pref *sibling;
	struct purple_pref *first_child;
};


static struct purple_pref prefs = {
	PURPLE_PREF_NONE,
	NULL,
	{ NULL },
	NULL,
	NULL,
	NULL,
	NULL
};

static GHashTable *prefs_hash = NULL;
static guint       save_timer = 0;
static gboolean    prefs_loaded = FALSE;

/*********************************************************************
 * Private utility functions                                         *
 *********************************************************************/

static struct
purple_pref *find_pref(const char *name)
{
	g_return_val_if_fail(name != NULL && name[0] == '/', NULL);

	if (name[1] == '\0')
		return &prefs;
	else
	{
		/* When we're initializing, the debug system is
		 * initialized before the prefs system, but debug
		 * calls will end up calling prefs functions, so we
		 * need to deal cleanly here. */
		if (prefs_hash)
			return g_hash_table_lookup(prefs_hash, name);
		else
			return NULL;
	}
}


/*********************************************************************
 * Writing to disk                                                   *
 *********************************************************************/

/*
 * This function recursively creates the PurpleXmlNode tree from the prefs
 * tree structure.  Yay recursion!
 */
static void
pref_to_xmlnode(PurpleXmlNode *parent, struct purple_pref *pref)
{
	PurpleXmlNode *node, *childnode;
	struct purple_pref *child;
	char buf[21];
	GList *cur;

	/* Create a new node */
	node = purple_xmlnode_new_child(parent, "pref");
	purple_xmlnode_set_attrib(node, "name", pref->name);

	/* Set the type of this node (if type == PURPLE_PREF_NONE then do nothing) */
	if (pref->type == PURPLE_PREF_INT) {
		purple_xmlnode_set_attrib(node, "type", "int");
		g_snprintf(buf, sizeof(buf), "%d", pref->value.integer);
		purple_xmlnode_set_attrib(node, "value", buf);
	}
	else if (pref->type == PURPLE_PREF_STRING) {
		purple_xmlnode_set_attrib(node, "type", "string");
		purple_xmlnode_set_attrib(node, "value", pref->value.string ? pref->value.string : "");
	}
	else if (pref->type == PURPLE_PREF_STRING_LIST) {
		purple_xmlnode_set_attrib(node, "type", "stringlist");
		for (cur = pref->value.stringlist; cur != NULL; cur = cur->next)
		{
			childnode = purple_xmlnode_new_child(node, "item");
			purple_xmlnode_set_attrib(childnode, "value", cur->data ? cur->data : "");
		}
	}
	else if (pref->type == PURPLE_PREF_PATH) {
		char *encoded = g_filename_to_utf8(pref->value.string ? pref->value.string : "", -1, NULL, NULL, NULL);
		purple_xmlnode_set_attrib(node, "type", "path");
		purple_xmlnode_set_attrib(node, "value", encoded);
		g_free(encoded);
	}
	else if (pref->type == PURPLE_PREF_PATH_LIST) {
		purple_xmlnode_set_attrib(node, "type", "pathlist");
		for (cur = pref->value.stringlist; cur != NULL; cur = cur->next)
		{
			char *encoded = g_filename_to_utf8(cur->data ? cur->data : "", -1, NULL, NULL, NULL);
			childnode = purple_xmlnode_new_child(node, "item");
			purple_xmlnode_set_attrib(childnode, "value", encoded);
			g_free(encoded);
		}
	}
	else if (pref->type == PURPLE_PREF_BOOLEAN) {
		purple_xmlnode_set_attrib(node, "type", "bool");
		g_snprintf(buf, sizeof(buf), "%d", pref->value.boolean);
		purple_xmlnode_set_attrib(node, "value", buf);
	}

	/* All My Children */
	for (child = pref->first_child; child != NULL; child = child->sibling)
		pref_to_xmlnode(node, child);
}

static PurpleXmlNode *
prefs_to_xmlnode(void)
{
	PurpleXmlNode *node;
	struct purple_pref *pref, *child;

	pref = &prefs;

	/* Create the root preference node */
	node = purple_xmlnode_new("pref");
	purple_xmlnode_set_attrib(node, "version", "1");
	purple_xmlnode_set_attrib(node, "name", "/");

	/* All My Children */
	for (child = pref->first_child; child != NULL; child = child->sibling)
		pref_to_xmlnode(node, child);

	return node;
}

static void
sync_prefs(void)
{
	PurpleXmlNode *node;
	char *data;

	if (!prefs_loaded)
	{
		/*
		 * TODO: Call schedule_prefs_save()?  Ideally we wouldn't need to.
		 * (prefs.xml should be loaded when purple_prefs_init is called)
		 */
		purple_debug_error("prefs", "Attempted to save prefs before "
						 "they were read!\n");
		return;
	}

	node = prefs_to_xmlnode();
	data = purple_xmlnode_to_formatted_str(node, NULL);
	purple_util_write_data_to_config_file("prefs.xml", data, -1);
	g_free(data);
	purple_xmlnode_free(node);
}

static void
save_cb(G_GNUC_UNUSED gpointer data)
{
	sync_prefs();
	save_timer = 0;
}

static void
schedule_prefs_save(void)
{
	if(save_timer == 0) {
		save_timer = g_timeout_add_seconds_once(5, save_cb, NULL);
	}
}


/*********************************************************************
 * Reading from disk                                                 *
 *********************************************************************/

static GList *prefs_stack = NULL;

static void
prefs_start_element_handler(G_GNUC_UNUSED GMarkupParseContext *context,
                            const char *element_name,
                            const char **attribute_names,
                            const char **attribute_values,
                            G_GNUC_UNUSED gpointer user_data,
                            G_GNUC_UNUSED GError **error)
{
	PurplePrefType pref_type = PURPLE_PREF_NONE;
	int i;
	const char *pref_name = NULL, *pref_value = NULL;
	GString *pref_name_full;
	GList *tmp;

	if(!purple_strequal(element_name, "pref") &&
	   !purple_strequal(element_name, "item"))
		return;

	for(i = 0; attribute_names[i]; i++) {
		if(purple_strequal(attribute_names[i], "name")) {
			pref_name = attribute_values[i];
		} else if(purple_strequal(attribute_names[i], "type")) {
			if(purple_strequal(attribute_values[i], "bool"))
				pref_type = PURPLE_PREF_BOOLEAN;
			else if(purple_strequal(attribute_values[i], "int"))
				pref_type = PURPLE_PREF_INT;
			else if(purple_strequal(attribute_values[i], "string"))
				pref_type = PURPLE_PREF_STRING;
			else if(purple_strequal(attribute_values[i], "stringlist"))
				pref_type = PURPLE_PREF_STRING_LIST;
			else if(purple_strequal(attribute_values[i], "path"))
				pref_type = PURPLE_PREF_PATH;
			else if(purple_strequal(attribute_values[i], "pathlist"))
				pref_type = PURPLE_PREF_PATH_LIST;
			else
				return;
		} else if(purple_strequal(attribute_names[i], "value")) {
			pref_value = attribute_values[i];
		}
	}

	if ((pref_type == PURPLE_PREF_BOOLEAN || pref_type == PURPLE_PREF_INT) &&
			pref_value == NULL) {
		/* Missing a value attribute */
		return;
	}

	if(purple_strequal(element_name, "item")) {
		struct purple_pref *pref;

		pref_name_full = g_string_new("");

		for(tmp = prefs_stack; tmp; tmp = tmp->next) {
			pref_name_full = g_string_prepend(pref_name_full, tmp->data);
			pref_name_full = g_string_prepend_c(pref_name_full, '/');
		}

		pref = find_pref(pref_name_full->str);

		if(pref) {
			if(pref->type == PURPLE_PREF_STRING_LIST) {
				pref->value.stringlist = g_list_append(pref->value.stringlist,
						g_strdup(pref_value));
			} else if(pref->type == PURPLE_PREF_PATH_LIST) {
				pref->value.stringlist = g_list_append(pref->value.stringlist,
						g_filename_from_utf8(pref_value, -1, NULL, NULL, NULL));
			}
		}
		g_string_free(pref_name_full, TRUE);
	} else {
		char *decoded;

		if(!pref_name || purple_strequal(pref_name, "/"))
			return;

		pref_name_full = g_string_new(pref_name);

		for(tmp = prefs_stack; tmp; tmp = tmp->next) {
			pref_name_full = g_string_prepend_c(pref_name_full, '/');
			pref_name_full = g_string_prepend(pref_name_full, tmp->data);
		}

		pref_name_full = g_string_prepend_c(pref_name_full, '/');

		switch(pref_type) {
			case PURPLE_PREF_NONE:
				purple_prefs_add_none(pref_name_full->str);
				break;
			case PURPLE_PREF_BOOLEAN:
				purple_prefs_set_bool(pref_name_full->str, atoi(pref_value));
				break;
			case PURPLE_PREF_INT:
				purple_prefs_set_int(pref_name_full->str, atoi(pref_value));
				break;
			case PURPLE_PREF_STRING:
				purple_prefs_set_string(pref_name_full->str, pref_value);
				break;
			case PURPLE_PREF_STRING_LIST:
				purple_prefs_set_string_list(pref_name_full->str, NULL);
				break;
			case PURPLE_PREF_PATH:
				if (pref_value) {
					decoded = g_filename_from_utf8(pref_value, -1, NULL, NULL, NULL);
					purple_prefs_set_path(pref_name_full->str, decoded);
					g_free(decoded);
				} else {
					purple_prefs_set_path(pref_name_full->str, NULL);
				}
				break;
			case PURPLE_PREF_PATH_LIST:
				purple_prefs_set_path_list(pref_name_full->str, NULL);
				break;
		}
		prefs_stack = g_list_prepend(prefs_stack, g_strdup(pref_name));
		g_string_free(pref_name_full, TRUE);
	}
}

static void
prefs_end_element_handler(G_GNUC_UNUSED GMarkupParseContext *context,
                          const gchar *element_name,
                          G_GNUC_UNUSED gpointer user_data,
                          G_GNUC_UNUSED GError **error)
{
	if(prefs_stack && purple_strequal(element_name, "pref")) {
		g_free(prefs_stack->data);
		prefs_stack = g_list_delete_link(prefs_stack, prefs_stack);
	}
}

static GMarkupParser prefs_parser = {
	prefs_start_element_handler,
	prefs_end_element_handler,
	NULL,
	NULL,
	NULL
};

gboolean
purple_prefs_load(void)
{
	gchar *filename;
	gchar *contents = NULL;
	gsize length;
	GMarkupParseContext *context;
	GError *error = NULL;

	filename = g_build_filename(purple_config_dir(), "prefs.xml", NULL);

	if (!filename) {
		prefs_loaded = TRUE;
		return FALSE;
	}

	purple_debug_misc("prefs", "Reading %s", filename);

	if(!g_file_get_contents(filename, &contents, &length, &error)) {
		const gchar *sysconfdir = PURPLE_SYSCONFDIR;
		g_free(filename);
		g_clear_error(&error);

		if (sysconfdir == NULL)
			sysconfdir = "";
		filename = g_build_filename(sysconfdir, "purple", "prefs.xml", NULL);

		purple_debug_info("prefs", "Reading %s\n", filename);

		if (!g_file_get_contents(filename, &contents, &length, &error)) {
			purple_debug_info("prefs", "Error reading prefs: %s\n",
					error->message);
			g_error_free(error);
			g_free(filename);
			prefs_loaded = TRUE;

			return FALSE;
		}
	}

	context = g_markup_parse_context_new(&prefs_parser, 0, NULL, NULL);

	if(!g_markup_parse_context_parse(context, contents, length, NULL)) {
		g_markup_parse_context_free(context);
		g_free(contents);
		g_free(filename);
		prefs_loaded = TRUE;

		return FALSE;
	}

	if(!g_markup_parse_context_end_parse(context, NULL)) {
		purple_debug_error("prefs", "Error parsing %s\n", filename);
		g_markup_parse_context_free(context);
		g_free(contents);
		g_free(filename);
		prefs_loaded = TRUE;

		return FALSE;
	}

	if (purple_debug_is_verbose())
		purple_debug_misc("prefs", "Finished reading %s", filename);
	g_markup_parse_context_free(context);
	g_free(contents);
	g_free(filename);
	prefs_loaded = TRUE;

	return TRUE;
}

static void
prefs_save_cb(const char *name, G_GNUC_UNUSED PurplePrefType type,
              G_GNUC_UNUSED gconstpointer val,
              G_GNUC_UNUSED gpointer user_data)
{

	if(!prefs_loaded)
		return;

	purple_debug_misc("prefs", "%s changed, scheduling save.\n", name);

	schedule_prefs_save();
}

static char *
get_path_dirname(const char *name)
{
	char *c, *str;

	str = g_strdup(name);

	if ((c = strrchr(str, '/')) != NULL) {
		*c = '\0';

		if (*str == '\0') {
			g_set_str(&str, "/");
		}
	} else {
		g_set_str(&str, ".");
	}

	return str;
}

static char *
get_path_basename(const char *name)
{
	const char *c;

	if ((c = strrchr(name, '/')) != NULL)
		return g_strdup(c + 1);

	return g_strdup(name);
}

static char *
pref_full_name(struct purple_pref *pref)
{
	GString *name;
	struct purple_pref *parent;

	if(!pref)
		return NULL;

	if(pref == &prefs)
		return g_strdup("/");

	name = g_string_new(pref->name);

	for(parent = pref->parent; parent && parent->name; parent = parent->parent) {
		name = g_string_prepend_c(name, '/');
		name = g_string_prepend(name, parent->name);
	}
	name = g_string_prepend_c(name, '/');
	return g_string_free_and_steal(name);
}

static struct purple_pref *
find_pref_parent(const char *name)
{
	char *parent_name = get_path_dirname(name);
	struct purple_pref *ret = &prefs;

	if(!purple_strequal(parent_name, "/")) {
		ret = find_pref(parent_name);
	}

	g_free(parent_name);
	return ret;
}

static void
free_pref_value(struct purple_pref *pref)
{
	switch(pref->type) {
		case PURPLE_PREF_BOOLEAN:
			pref->value.boolean = FALSE;
			break;
		case PURPLE_PREF_INT:
			pref->value.integer = 0;
			break;
		case PURPLE_PREF_STRING:
		case PURPLE_PREF_PATH:
			g_free(pref->value.string);
			pref->value.string = NULL;
			break;
		case PURPLE_PREF_STRING_LIST:
		case PURPLE_PREF_PATH_LIST:
			g_list_free_full(pref->value.stringlist, g_free);
			break;
		case PURPLE_PREF_NONE:
			break;
	}
}

static struct purple_pref *
add_pref(PurplePrefType type, const char *name)
{
	struct purple_pref *parent;
	struct purple_pref *me;
	struct purple_pref *sibling;
	char *my_name;

	parent = find_pref_parent(name);

	g_return_val_if_fail(parent, NULL);

	my_name = get_path_basename(name);

	for(sibling = parent->first_child; sibling; sibling = sibling->sibling) {
		if(purple_strequal(sibling->name, my_name)) {
			g_free(my_name);
			return NULL;
		}
	}

	me = g_new0(struct purple_pref, 1);
	me->type = type;
	me->name = my_name;

	me->parent = parent;
	if(parent->first_child) {
		/* blatant abuse of a for loop */
		for(sibling = parent->first_child; sibling->sibling;
				sibling = sibling->sibling);
		sibling->sibling = me;
	} else {
		parent->first_child = me;
	}

	g_hash_table_insert(prefs_hash, g_strdup(name), (gpointer)me);

	return me;
}

void
purple_prefs_add_none(const char *name)
{
	add_pref(PURPLE_PREF_NONE, name);
}

void
purple_prefs_add_bool(const char *name, gboolean value)
{
	struct purple_pref *pref;

	pref = add_pref(PURPLE_PREF_BOOLEAN, name);

	if(!pref)
		return;

	pref->value.boolean = value;
}

void
purple_prefs_add_int(const char *name, int value)
{
	struct purple_pref *pref;

	pref = add_pref(PURPLE_PREF_INT, name);

	if(!pref)
		return;

	pref->value.integer = value;
}

void
purple_prefs_add_string(const char *name, const char *value)
{
	struct purple_pref *pref;

	if(value != NULL && !g_utf8_validate(value, -1, NULL)) {
		purple_debug_error("prefs", "purple_prefs_add_string: Cannot store invalid UTF8 for string pref %s\n", name);
		return;
	}

	pref = add_pref(PURPLE_PREF_STRING, name);

	if(!pref)
		return;

	pref->value.string = g_strdup(value);
}

void
purple_prefs_add_string_list(const char *name, GList *value)
{
	struct purple_pref *pref;
	GList *tmp;

	pref = add_pref(PURPLE_PREF_STRING_LIST, name);

	if(!pref)
		return;

	for(tmp = value; tmp; tmp = tmp->next) {
		if(tmp->data != NULL && !g_utf8_validate(tmp->data, -1, NULL)) {
			purple_debug_error("prefs", "purple_prefs_add_string_list: Skipping invalid UTF8 for string list pref %s\n", name);
			continue;
		}
		pref->value.stringlist = g_list_append(pref->value.stringlist,
				g_strdup(tmp->data));
	}
}

void
purple_prefs_add_path(const char *name, const char *value)
{
	struct purple_pref *pref;

	pref = add_pref(PURPLE_PREF_PATH, name);

	if(!pref)
		return;

	pref->value.string = g_strdup(value);
}

void
purple_prefs_add_path_list(const char *name, GList *value)
{
	struct purple_pref *pref;
	GList *copy = NULL;

	pref = add_pref(PURPLE_PREF_PATH_LIST, name);

	if(!pref)
		return;

	copy = g_list_copy_deep(value, (GCopyFunc)(GCallback)g_strdup, NULL);
	pref->value.stringlist = g_list_concat(pref->value.stringlist, copy);
}

static void
free_pref(struct purple_pref *pref)
{
	char *name;

	name = pref_full_name(pref);

	if (prefs_loaded) {
		purple_debug_info("prefs", "removing pref %s\n", name);
	}

	g_hash_table_remove(prefs_hash, name);
	g_free(name);

	free_pref_value(pref);

	g_slist_free_full(pref->callbacks, g_free);
	g_free(pref->name);
	g_free(pref);
}

static void
remove_pref(struct purple_pref *pref)
{
	struct purple_pref *child;

	if (!pref) {
		return;
	}

	child = pref->first_child;
	pref->first_child = NULL;
	while (child) {
		struct purple_pref *next;
		if (child->first_child) {
			next = child->first_child;
			child->first_child = NULL;
		} else if (child->sibling) {
			next = child->sibling;
			child->sibling = NULL;
			free_pref(child);
		} else {
			if (child->parent != pref) {
				next = child->parent;
			} else {
				next = NULL;
			}
			free_pref(child);
		}
		child = next;
	}

	if (pref == &prefs) {
		return;
	}

	if (pref->parent->first_child == pref) {
		pref->parent->first_child = pref->sibling;
	} else {
		child = pref->parent->first_child;
		while (child && child->sibling != pref) {
			child = child->sibling;
		}
		if (child) {
			child->sibling = pref->sibling;
		}
	}

	free_pref(pref);
}

static void
purple_prefs_destroy(void)
{
	struct purple_pref *pref;

	pref = find_pref("/");

	if(!pref)
		return;

	remove_pref(pref);
}

static void
do_callbacks(const char* name, struct purple_pref *pref)
{
	GSList *cbs;
	struct purple_pref *cb_pref;
	for(cb_pref = pref; cb_pref; cb_pref = cb_pref->parent) {
		for(cbs = cb_pref->callbacks; cbs; cbs = cbs->next) {
			PurplePrefCallbackData *cb = cbs->data;
			cb->func(name, pref->type, pref->value.generic, cb->data);
		}
	}
}

void
purple_prefs_trigger_callback(const char *name)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if(!pref) {
		purple_debug_error("prefs",
				"purple_prefs_trigger_callback: Unknown pref %s\n", name);
		return;
	}

	do_callbacks(name, pref);
}

/* this function is deprecated, so it doesn't get the new UI ops */
void
purple_prefs_set_bool(const char *name, gboolean value)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if(pref) {
		if(pref->type != PURPLE_PREF_BOOLEAN) {
			purple_debug_error("prefs",
					"purple_prefs_set_bool: %s not a boolean pref\n", name);
			return;
		}

		if(pref->value.boolean != value) {
			pref->value.boolean = value;
			do_callbacks(name, pref);
		}
	} else {
		purple_prefs_add_bool(name, value);
	}
}

void
purple_prefs_set_int(const char *name, int value)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if(pref) {
		if(pref->type != PURPLE_PREF_INT) {
			purple_debug_error("prefs",
					"purple_prefs_set_int: %s not an integer pref\n", name);
			return;
		}

		if(pref->value.integer != value) {
			pref->value.integer = value;
			do_callbacks(name, pref);
		}
	} else {
		purple_prefs_add_int(name, value);
	}
}

void
purple_prefs_set_string(const char *name, const char *value)
{
	struct purple_pref *pref;

	if(value != NULL && !g_utf8_validate(value, -1, NULL)) {
		purple_debug_error("prefs", "purple_prefs_set_string: Cannot store invalid UTF8 for string pref %s\n", name);
		return;
	}

	pref = find_pref(name);

	if(pref) {
		if(pref->type != PURPLE_PREF_STRING && pref->type != PURPLE_PREF_PATH) {
			purple_debug_error("prefs",
					"purple_prefs_set_string: %s not a string pref\n", name);
			return;
		}

		if(g_set_str(&pref->value.string, value)) {
			do_callbacks(name, pref);
		}
	} else {
		purple_prefs_add_string(name, value);
	}
}

void
purple_prefs_set_string_list(const char *name, GList *value)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if(pref) {
		GList *tmp;

		if(pref->type != PURPLE_PREF_STRING_LIST) {
			purple_debug_error("prefs",
					"purple_prefs_set_string_list: %s not a string list pref\n",
					name);
			return;
		}

		g_clear_list(&pref->value.stringlist, g_free);

		for(tmp = value; tmp; tmp = tmp->next) {
			if(tmp->data != NULL && !g_utf8_validate(tmp->data, -1, NULL)) {
				purple_debug_error("prefs", "purple_prefs_set_string_list: Skipping invalid UTF8 for string list pref %s\n", name);
				continue;
			}
			pref->value.stringlist = g_list_prepend(pref->value.stringlist,
					g_strdup(tmp->data));
		}
		pref->value.stringlist = g_list_reverse(pref->value.stringlist);

		do_callbacks(name, pref);

	} else {
		purple_prefs_add_string_list(name, value);
	}
}

void
purple_prefs_set_path(const char *name, const char *value)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if(pref) {
		if(pref->type != PURPLE_PREF_PATH) {
			purple_debug_error("prefs",
					"purple_prefs_set_path: %s not a path pref\n", name);
			return;
		}

		if(g_set_str(&pref->value.string, value)) {
			do_callbacks(name, pref);
		}
	} else {
		purple_prefs_add_path(name, value);
	}
}

void
purple_prefs_set_path_list(const char *name, GList *value)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if(pref) {
		if(pref->type != PURPLE_PREF_PATH_LIST) {
			purple_debug_error("prefs",
					"purple_prefs_set_path_list: %s not a path list pref\n",
					name);
			return;
		}

		g_list_free_full(pref->value.stringlist, g_free);
		pref->value.stringlist = g_list_copy_deep(value,
		                                          (GCopyFunc)(GCallback)g_strdup,
		                                          NULL);

		do_callbacks(name, pref);

	} else {
		purple_prefs_add_path_list(name, value);
	}
}


gboolean
purple_prefs_exists(const char *name)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if (pref != NULL)
		return TRUE;

	return FALSE;
}

PurplePrefType
purple_prefs_get_pref_type(const char *name)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if (pref == NULL)
		return PURPLE_PREF_NONE;

	return (pref->type);
}

gboolean
purple_prefs_get_bool(const char *name)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if(!pref) {
		purple_debug_error("prefs",
				"purple_prefs_get_bool: Unknown pref %s\n", name);
		return FALSE;
	} else if(pref->type != PURPLE_PREF_BOOLEAN) {
		purple_debug_error("prefs",
				"purple_prefs_get_bool: %s not a boolean pref\n", name);
		return FALSE;
	}

	return pref->value.boolean;
}

int
purple_prefs_get_int(const char *name)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if(!pref) {
		purple_debug_error("prefs",
				"purple_prefs_get_int: Unknown pref %s\n", name);
		return 0;
	} else if(pref->type != PURPLE_PREF_INT) {
		purple_debug_error("prefs",
				"purple_prefs_get_int: %s not an integer pref\n", name);
		return 0;
	}

	return pref->value.integer;
}

const char *
purple_prefs_get_string(const char *name)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if(!pref) {
		purple_debug_error("prefs",
				"purple_prefs_get_string: Unknown pref %s\n", name);
		return NULL;
	} else if(pref->type != PURPLE_PREF_STRING) {
		purple_debug_error("prefs",
				"purple_prefs_get_string: %s not a string pref\n", name);
		return NULL;
	}

	return pref->value.string;
}

GList *
purple_prefs_get_string_list(const char *name)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if(!pref) {
		purple_debug_error("prefs",
				"purple_prefs_get_string_list: Unknown pref %s\n", name);
		return NULL;
	} else if(pref->type != PURPLE_PREF_STRING_LIST) {
		purple_debug_error("prefs",
				"purple_prefs_get_string_list: %s not a string list pref\n", name);
		return NULL;
	}

	return g_list_copy_deep(pref->value.stringlist,
	                        (GCopyFunc)(GCallback)g_strdup, NULL);
}

const char *
purple_prefs_get_path(const char *name)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if(!pref) {
		purple_debug_error("prefs",
				"purple_prefs_get_path: Unknown pref %s\n", name);
		return NULL;
	} else if(pref->type != PURPLE_PREF_PATH) {
		purple_debug_error("prefs",
				"purple_prefs_get_path: %s not a path pref\n", name);
		return NULL;
	}

	return pref->value.string;
}

GList *
purple_prefs_get_path_list(const char *name)
{
	struct purple_pref *pref;

	pref = find_pref(name);

	if(!pref) {
		purple_debug_error("prefs",
				"purple_prefs_get_path_list: Unknown pref %s\n", name);
		return NULL;
	} else if(pref->type != PURPLE_PREF_PATH_LIST) {
		purple_debug_error("prefs",
				"purple_prefs_get_path_list: %s not a path list pref\n", name);
		return NULL;
	}

	return g_list_copy_deep(pref->value.stringlist,
	                        (GCopyFunc)(GCallback)g_strdup, NULL);
}

guint
purple_prefs_connect_callback(void *handle, const char *name, PurplePrefCallback func, gpointer data)
{
	struct purple_pref *pref = NULL;
	PurplePrefCallbackData *cb;
	static guint cb_id = 0;
	g_return_val_if_fail(name != NULL, 0);
	g_return_val_if_fail(func != NULL, 0);

	pref = find_pref(name);
	if (pref == NULL) {
		purple_debug_error("prefs", "purple_prefs_connect_callback: Unknown pref %s\n", name);
		return 0;
	}

	cb = g_new0(PurplePrefCallbackData, 1);

	cb->func = func;
	cb->data = data;
	cb->id = ++cb_id;
	cb->handle = handle;
	cb->name = g_strdup(name);

	pref->callbacks = g_slist_append(pref->callbacks, cb);

	return cb->id;
}

void
purple_prefs_trigger_callback_object(PurplePrefCallbackData *cb)
{
	purple_prefs_trigger_callback(cb->name);
}

static gboolean
disco_callback_helper(struct purple_pref *pref, guint callback_id)
{
	GSList *cbs;
	struct purple_pref *child;

	if(!pref)
		return FALSE;

	for(cbs = pref->callbacks; cbs; cbs = cbs->next) {
		PurplePrefCallbackData *cb = cbs->data;
		if(cb->id == callback_id) {
			pref->callbacks = g_slist_delete_link(pref->callbacks, cbs);
			g_free(cb->name);
			g_free(cb);
			return TRUE;
		}
	}

	for(child = pref->first_child; child; child = child->sibling) {
		if(disco_callback_helper(child, callback_id))
			return TRUE;
	}

	return FALSE;
}

void
purple_prefs_disconnect_callback(guint callback_id)
{
	disco_callback_helper(&prefs, callback_id);
}

static void
disco_callback_helper_handle(struct purple_pref *pref, void *handle)
{
	GSList *cbs;
	struct purple_pref *child;

	if(!pref)
		return;

	cbs = pref->callbacks;
	while (cbs != NULL) {
		PurplePrefCallbackData *cb = cbs->data;
		if(cb->handle == handle) {
			pref->callbacks = g_slist_delete_link(pref->callbacks, cbs);
			g_free(cb->name);
			g_free(cb);
			cbs = pref->callbacks;
		} else
			cbs = cbs->next;
	}

	for(child = pref->first_child; child; child = child->sibling)
		disco_callback_helper_handle(child, handle);
}

void
purple_prefs_disconnect_by_handle(void *handle)
{
	g_return_if_fail(handle != NULL);

	disco_callback_helper_handle(&prefs, handle);
}

static void *
purple_prefs_get_handle(void)
{
	static int handle;

	return &handle;
}

void
purple_prefs_init(void)
{
	void *handle = purple_prefs_get_handle();

	prefs_hash = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, NULL);

	purple_prefs_connect_callback(handle, "/", prefs_save_cb, NULL);

	purple_prefs_add_none("/purple");
	purple_prefs_add_none("/plugins");
	purple_prefs_add_none("/plugins/core");
	purple_prefs_add_none("/plugins/prpl");

	/* Away */
	purple_prefs_add_none("/purple/away");
	purple_prefs_add_string("/purple/away/idle_reporting", "system");
	purple_prefs_add_bool("/purple/away/away_when_idle", TRUE);
	purple_prefs_add_int("/purple/away/mins_before_away", 5);

	/* Buddies */
	purple_prefs_add_none("/purple/buddies");

	/* Contact Priority Settings */
	purple_prefs_add_none("/purple/contact");
	purple_prefs_add_bool("/purple/contact/last_match", FALSE);

	purple_prefs_load();
}

void
purple_prefs_uninit(void)
{
	if(save_timer != 0) {
		g_clear_handle_id(&save_timer, g_source_remove);
		save_cb(NULL);
	}

	purple_prefs_disconnect_by_handle(purple_prefs_get_handle());

	prefs_loaded = FALSE;
	purple_prefs_destroy();
	g_clear_pointer(&prefs_hash, g_hash_table_destroy);
}