stored_playlist: return GError, code is playlist_result

Improve error reporting and handling.  command.c gets the new function
print_error(), which sends a GError to the client.

src/command.c

@@ -24,6 +24,7 @@
 #include "playlist_print.h"
 #include "playlist_save.h"
 #include "playlist_queue.h"
+#include "playlist_error.h"
 #include "queue_print.h"
 #include "ls.h"
 #include "uri.h"
@@ -376,6 +377,33 @@ print_playlist_result(struct client *client,
 	return COMMAND_RETURN_ERROR;
 }
 
+/**
+ * Send the GError to the client and free the GError.
+ */
+static enum command_return
+print_error(struct client *client, GError *error)
+{
+	assert(client != NULL);
+	assert(error != NULL);
+
+	g_warning("%s", error->message);
+
+	if (error->domain == playlist_quark()) {
+		enum playlist_result result = error->code;
+		g_error_free(error);
+		return print_playlist_result(client, result);
+	} else if (error->domain == g_file_error_quark()) {
+		command_error(client, ACK_ERROR_SYSTEM, "%s",
+			      g_strerror(error->code));
+		g_error_free(error);
+		return COMMAND_RETURN_ERROR;
+	}
+
+	g_error_free(error);
+	command_error(client, ACK_ERROR_UNKNOWN, "error");
+	return COMMAND_RETURN_ERROR;
+}
+
 static void
 print_spl_list(struct client *client, GPtrArray *list)
 {
@@ -766,9 +794,11 @@ handle_load(struct client *client, G_GNUC_UNUSED int argc, char *argv[])
 	if (result != PLAYLIST_RESULT_NO_SUCH_LIST)
 		return print_playlist_result(client, result);
 
-	result = playlist_load_spl(&g_playlist, client->player_control,
+	GError *error = NULL;
-				   argv[1]);
+	return playlist_load_spl(&g_playlist, client->player_control,
-	return print_playlist_result(client, result);
+				 argv[1], &error)
+		? COMMAND_RETURN_OK
+		: print_error(client, error);
 }
 
 static enum command_return
@@ -777,15 +807,10 @@ handle_listplaylist(struct client *client, G_GNUC_UNUSED int argc, char *argv[])
 	if (playlist_file_print(client, argv[1], false))
 		return COMMAND_RETURN_OK;
 
-	bool ret;
+	GError *error = NULL;
-
+	return spl_print(client, argv[1], false, &error)
-	ret = spl_print(client, argv[1], false);
+		? COMMAND_RETURN_OK
-	if (!ret) {
+		: print_error(client, error);
-		command_error(client, ACK_ERROR_NO_EXIST, "No such playlist");
-		return COMMAND_RETURN_ERROR;
-	}
-
-	return COMMAND_RETURN_OK;
 }
 
 static enum command_return
@@ -795,15 +820,10 @@ handle_listplaylistinfo(struct client *client,
 	if (playlist_file_print(client, argv[1], true))
 		return COMMAND_RETURN_OK;
 
-	bool ret;
+	GError *error = NULL;
-
+	return spl_print(client, argv[1], true, &error)
-	ret = spl_print(client, argv[1], true);
+		? COMMAND_RETURN_OK
-	if (!ret) {
+		: print_error(client, error);
-		command_error(client, ACK_ERROR_NO_EXIST, "No such playlist");
-		return COMMAND_RETURN_ERROR;
-	}
-
-	return COMMAND_RETURN_OK;
 }
 
 static enum command_return
@@ -828,7 +848,7 @@ handle_lsinfo(struct client *client, int argc, char *argv[])
 	directory_print(client, directory);
 
 	if (isRootDirectory(uri)) {
-		GPtrArray *list = spl_list();
+		GPtrArray *list = spl_list(NULL);
 		if (list != NULL) {
 			print_spl_list(client, list);
 			spl_list_free(list);
@@ -841,19 +861,19 @@ handle_lsinfo(struct client *client, int argc, char *argv[])
 static enum command_return
 handle_rm(struct client *client, G_GNUC_UNUSED int argc, char *argv[])
 {
-	enum playlist_result result;
+	GError *error = NULL;
-
+	return spl_delete(argv[1], &error)
-	result = spl_delete(argv[1]);
+		? COMMAND_RETURN_OK
-	return print_playlist_result(client, result);
+		: print_error(client, error);
 }
 
 static enum command_return
 handle_rename(struct client *client, G_GNUC_UNUSED int argc, char *argv[])
 {
-	enum playlist_result result;
+	GError *error = NULL;
-
+	return spl_rename(argv[1], argv[2], &error)
-	result = spl_rename(argv[1], argv[2]);
+		? COMMAND_RETURN_OK
-	return print_playlist_result(client, result);
+		: print_error(client, error);
 }
 
 static enum command_return
@@ -1064,13 +1084,14 @@ handle_playlistdelete(struct client *client,
 		      G_GNUC_UNUSED int argc, char *argv[]) {
 	char *playlist = argv[1];
 	int from;
-	enum playlist_result result;
 
 	if (!check_int(client, &from, argv[2], check_integer, argv[2]))
 		return COMMAND_RETURN_ERROR;
 
-	result = spl_remove_index(playlist, from);
+	GError *error = NULL;
-	return print_playlist_result(client, result);
+	return spl_remove_index(playlist, from, &error)
+		? COMMAND_RETURN_OK
+		: print_error(client, error);
 }
 
 static enum command_return
@@ -1078,15 +1099,16 @@ handle_playlistmove(struct client *client, G_GNUC_UNUSED int argc, char *argv[])
 {
 	char *playlist = argv[1];
 	int from, to;
-	enum playlist_result result;
 
 	if (!check_int(client, &from, argv[2], check_integer, argv[2]))
 		return COMMAND_RETURN_ERROR;
 	if (!check_int(client, &to, argv[3], check_integer, argv[3]))
 		return COMMAND_RETURN_ERROR;
 
-	result = spl_move_index(playlist, from, to);
+	GError *error = NULL;
-	return print_playlist_result(client, result);
+	return spl_move_index(playlist, from, to, &error)
+		? COMMAND_RETURN_OK
+		: print_error(client, error);
 }
 
 static enum command_return
@@ -1642,10 +1664,10 @@ handle_not_commands(struct client *client,
 static enum command_return
 handle_playlistclear(struct client *client, G_GNUC_UNUSED int argc, char *argv[])
 {
-	enum playlist_result result;
+	GError *error = NULL;
-
+	return spl_clear(argv[1], &error)
-	result = spl_clear(argv[1]);
+		? COMMAND_RETURN_OK
-	return print_playlist_result(client, result);
+		: print_error(client, error);
 }
 
 static enum command_return
@@ -1653,8 +1675,9 @@ handle_playlistadd(struct client *client, G_GNUC_UNUSED int argc, char *argv[])
 {
 	char *playlist = argv[1];
 	char *uri = argv[2];
-	enum playlist_result result;
 
+	bool success;
+	GError *error = NULL;
 	if (uri_has_scheme(uri)) {
 		if (!uri_supported_scheme(uri)) {
 			command_error(client, ACK_ERROR_NO_EXIST,
@@ -1662,29 +1685,27 @@ handle_playlistadd(struct client *client, G_GNUC_UNUSED int argc, char *argv[])
 			return COMMAND_RETURN_ERROR;
 		}
 
-		result = spl_append_uri(uri, playlist);
+		success = spl_append_uri(argv[1], playlist, &error);
 	} else
-		result = addAllInToStoredPlaylist(uri, playlist);
+		success = addAllInToStoredPlaylist(uri, playlist, &error);
 
-	if (result == (enum playlist_result)-1) {
+	if (!success && error == NULL) {
 		command_error(client, ACK_ERROR_NO_EXIST,
 			      "directory or file not found");
 		return COMMAND_RETURN_ERROR;
 	}
 
-	return print_playlist_result(client, result);
+	return success ? COMMAND_RETURN_OK : print_error(client, error);
 }
 
 static enum command_return
 handle_listplaylists(struct client *client,
 		     G_GNUC_UNUSED int argc, G_GNUC_UNUSED char *argv[])
 {
-	GPtrArray *list = spl_list();
+	GError *error = NULL;
-	if (list == NULL) {
+	GPtrArray *list = spl_list(&error);
-		command_error(client, ACK_ERROR_SYSTEM,
+	if (list == NULL)
-			      "failed to get list of stored playlists");
+		return print_error(client, error);
-		return COMMAND_RETURN_ERROR;
-	}
 
 	print_spl_list(client, list);
 	spl_list_free(list);

src/dbUtils.c

@@ -36,6 +36,7 @@ directoryAddSongToPlaylist(struct song *song, void *data)
 
 struct add_data {
 	const char *path;
+	GError **error_r;
 };
 
 static int
@@ -43,8 +44,10 @@ directoryAddSongToStoredPlaylist(struct song *song, void *_data)
 {
 	struct add_data *data = _data;
 
-	if (spl_append_song(data->path, song) != 0)
+	if (!spl_append_song(data->path, song, data->error_r)) {
 		return -1;
+	}
+
 	return 0;
 }
 
@@ -54,13 +57,16 @@ addAllIn(struct player_control *pc, const char *name)
 	return db_walk(name, directoryAddSongToPlaylist, NULL, pc);
 }
 
-int addAllInToStoredPlaylist(const char *name, const char *utf8file)
+bool
+addAllInToStoredPlaylist(const char *name, const char *utf8file,
+			 GError **error_r)
 {
 	struct add_data data = {
 		.path = utf8file,
+		.error_r = error_r,
 	};
 
-	return db_walk(name, directoryAddSongToStoredPlaylist, NULL, &data);
+	return db_walk(name, directoryAddSongToStoredPlaylist, NULL, &data) == 0;
 }
 
 struct find_add_data {

src/dbUtils.h

@@ -20,13 +20,18 @@
 #ifndef MPD_DB_UTILS_H
 #define MPD_DB_UTILS_H
 
+#include <glib.h>
+#include <stdbool.h>
+
 struct locate_item_list;
 struct player_control;
 
 int
 addAllIn(struct player_control *pc, const char *name);
 
-int addAllInToStoredPlaylist(const char *name, const char *utf8file);
+bool
+addAllInToStoredPlaylist(const char *uri_utf8, const char *path_utf8,
+			 GError **error_r);
 
 int
 findAddIn(struct player_control *pc, const char *name,

src/playlist_error.h

@@ -20,6 +20,8 @@
 #ifndef MPD_PLAYLIST_ERROR_H
 #define MPD_PLAYLIST_ERROR_H
 
+#include <glib.h>
+
 enum playlist_result {
 	PLAYLIST_RESULT_SUCCESS,
 	PLAYLIST_RESULT_ERRNO,
@@ -34,4 +36,14 @@ enum playlist_result {
 	PLAYLIST_RESULT_DISABLED,
 };
 
+/**
+ * Quark for GError.domain; the code is an enum #playlist_result.
+ */
+G_GNUC_CONST
+static inline GQuark
+playlist_quark(void)
+{
+	return g_quark_from_static_string("playlist");
+}
+
 #endif

src/playlist_print.c

@@ -117,11 +117,12 @@ playlist_print_changes_position(struct client *client,
 }
 
 bool
-spl_print(struct client *client, const char *name_utf8, bool detail)
+spl_print(struct client *client, const char *name_utf8, bool detail,
+	  GError **error_r)
 {
 	GPtrArray *list;
 
-	list = spl_load(name_utf8);
+	list = spl_load(name_utf8, error_r);
 	if (list == NULL)
 		return false;
 

src/playlist_print.h

@@ -20,6 +20,7 @@
 #ifndef PLAYLIST_PRINT_H
 #define PLAYLIST_PRINT_H
 
+#include <glib.h>
 #include <stdbool.h>
 #include <stdint.h>
 
@@ -99,7 +100,8 @@ playlist_print_changes_position(struct client *client,
  * @return true on success, false if the playlist does not exist
  */
 bool
-spl_print(struct client *client, const char *name_utf8, bool detail);
+spl_print(struct client *client, const char *name_utf8, bool detail,
+	  GError **error_r);
 
 /**
  * Send the playlist file to the client.

src/playlist_save.c

@@ -110,15 +110,15 @@ spl_save_playlist(const char *name_utf8, const struct playlist *playlist)
 	return spl_save_queue(name_utf8, &playlist->queue);
 }
 
-enum playlist_result
+bool
 playlist_load_spl(struct playlist *playlist, struct player_control *pc,
-		  const char *name_utf8)
+		  const char *name_utf8, GError **error_r)
 {
 	GPtrArray *list;
 
-	list = spl_load(name_utf8);
+	list = spl_load(name_utf8, error_r);
 	if (list == NULL)
-		return PLAYLIST_RESULT_NO_SUCH_LIST;
+		return false;
 
 	for (unsigned i = 0; i < list->len; ++i) {
 		const char *temp = g_ptr_array_index(list, i);
@@ -139,5 +139,5 @@ playlist_load_spl(struct playlist *playlist, struct player_control *pc,
 	}
 
 	spl_free(list);
-	return PLAYLIST_RESULT_SUCCESS;
+	return true;
 }

src/playlist_save.h

@@ -22,6 +22,7 @@
 
 #include "playlist_error.h"
 
+#include <stdbool.h>
 #include <stdio.h>
 
 struct song;
@@ -51,8 +52,8 @@ spl_save_playlist(const char *name_utf8, const struct playlist *playlist);
  * Loads a stored playlist file, and append all songs to the global
  * playlist.
  */
-enum playlist_result
+bool
 playlist_load_spl(struct playlist *playlist, struct player_control *pc,
-		  const char *name_utf8);
+		  const char *name_utf8, GError **error_r);
 
 #endif

src/stored_playlist.c

@@ -28,6 +28,7 @@
 #include "database.h"
 #include "idle.h"
 #include "conf.h"
+#include "glib_compat.h"
 
 #include <assert.h>
 #include <sys/types.h>
@@ -72,6 +73,67 @@ spl_valid_name(const char *name_utf8)
 		strchr(name_utf8, '\r') == NULL;
 }
 
+static const char *
+spl_map(GError **error_r)
+{
+	const char *path_fs = map_spl_path();
+	if (path_fs == NULL)
+		g_set_error_literal(error_r, playlist_quark(),
+				    PLAYLIST_RESULT_DISABLED,
+				    "Stored playlists are disabled");
+
+	return path_fs;
+}
+
+static bool
+spl_check_name(const char *name_utf8, GError **error_r)
+{
+	if (!spl_valid_name(name_utf8)) {
+		g_set_error_literal(error_r, playlist_quark(),
+				    PLAYLIST_RESULT_BAD_NAME,
+				    "Bad playlist name");
+		return false;
+	}
+
+	return true;
+}
+
+static char *
+spl_map_to_fs(const char *name_utf8, GError **error_r)
+{
+	if (spl_map(error_r) == NULL ||
+	    !spl_check_name(name_utf8, error_r))
+		return NULL;
+
+	char *path_fs = map_spl_utf8_to_fs(name_utf8);
+	if (path_fs == NULL)
+		g_set_error_literal(error_r, playlist_quark(),
+				    PLAYLIST_RESULT_BAD_NAME,
+				    "Bad playlist name");
+
+	return path_fs;
+}
+
+/**
+ * Create a GError for the current errno.
+ */
+static void
+playlist_errno(GError **error_r)
+{
+	switch (errno) {
+	case ENOENT:
+		g_set_error_literal(error_r, playlist_quark(),
+				    PLAYLIST_RESULT_NO_SUCH_LIST,
+				    "No such playlist");
+		break;
+
+	default:
+		g_set_error_literal(error_r, g_file_error_quark(), errno,
+				    g_strerror(errno));
+		break;
+	}
+}
+
 static struct stored_playlist_info *
 load_playlist_info(const char *parent_path_fs, const char *name_fs)
 {
@@ -108,9 +170,9 @@ load_playlist_info(const char *parent_path_fs, const char *name_fs)
 }
 
 GPtrArray *
-spl_list(void)
+spl_list(GError **error_r)
 {
-	const char *parent_path_fs = map_spl_path();
+	const char *parent_path_fs = spl_map(error_r);
 	DIR *dir;
 	struct dirent *ent;
 	GPtrArray *list;
@@ -120,8 +182,11 @@ spl_list(void)
 		return NULL;
 
 	dir = opendir(parent_path_fs);
-	if (dir == NULL)
+	if (dir == NULL) {
+		g_set_error_literal(error_r, g_file_error_quark(), errno,
+				    g_strerror(errno));
 		return NULL;
+	}
 
 	list = g_ptr_array_new();
 
@@ -148,25 +213,26 @@ spl_list_free(GPtrArray *list)
 	g_ptr_array_free(list, true);
 }
 
-static enum playlist_result
+static bool
-spl_save(GPtrArray *list, const char *utf8path)
+spl_save(GPtrArray *list, const char *utf8path, GError **error_r)
 {
 	FILE *file;
-	char *path_fs;
 
 	assert(utf8path != NULL);
 
-	if (map_spl_path() == NULL)
+	if (spl_map(error_r) == NULL)
-		return PLAYLIST_RESULT_DISABLED;
+		return false;
 
-	path_fs = map_spl_utf8_to_fs(utf8path);
+	char *path_fs = spl_map_to_fs(utf8path, error_r);
 	if (path_fs == NULL)
-		return PLAYLIST_RESULT_BAD_NAME;
+		return false;
 
 	file = fopen(path_fs, "w");
 	g_free(path_fs);
-	if (file == NULL)
+	if (file == NULL) {
-		return PLAYLIST_RESULT_ERRNO;
+		playlist_errno(error_r);
+		return false;
+	}
 
 	for (unsigned i = 0; i < list->len; ++i) {
 		const char *uri = g_ptr_array_index(list, i);
@@ -174,27 +240,29 @@ spl_save(GPtrArray *list, const char *utf8path)
 	}
 
 	fclose(file);
-	return PLAYLIST_RESULT_SUCCESS;
+	return true;
 }
 
 GPtrArray *
-spl_load(const char *utf8path)
+spl_load(const char *utf8path, GError **error_r)
 {
 	FILE *file;
 	GPtrArray *list;
 	char *path_fs;
 
-	if (!spl_valid_name(utf8path) || map_spl_path() == NULL)
+	if (spl_map(error_r) == NULL)
 		return NULL;
 
-	path_fs = map_spl_utf8_to_fs(utf8path);
+	path_fs = spl_map_to_fs(utf8path, error_r);
 	if (path_fs == NULL)
 		return NULL;
 
 	file = fopen(path_fs, "r");
 	g_free(path_fs);
-	if (file == NULL)
+	if (file == NULL) {
+		playlist_errno(error_r);
 		return NULL;
+	}
 
 	list = g_ptr_array_new();
 
@@ -260,30 +328,33 @@ spl_insert_index_internal(GPtrArray *list, unsigned idx, char *uri)
 	g_ptr_array_index(list, idx) = uri;
 }
 
-enum playlist_result
+bool
-spl_move_index(const char *utf8path, unsigned src, unsigned dest)
+spl_move_index(const char *utf8path, unsigned src, unsigned dest,
+	       GError **error_r)
 {
-	GPtrArray *list;
 	char *uri;
-	enum playlist_result result;
 
 	if (src == dest)
 		/* this doesn't check whether the playlist exists, but
 		   what the hell.. */
-		return PLAYLIST_RESULT_SUCCESS;
+		return true;
 
-	if (!(list = spl_load(utf8path)))
+	GPtrArray *list = spl_load(utf8path, error_r);
-		return PLAYLIST_RESULT_NO_SUCH_LIST;
+	if (list == NULL)
+		return false;
 
 	if (src >= list->len || dest >= list->len) {
 		spl_free(list);
-		return PLAYLIST_RESULT_BAD_RANGE;
+		g_set_error_literal(error_r, playlist_quark(),
+				    PLAYLIST_RESULT_BAD_RANGE,
+				    "Bad range");
+		return false;
 	}
 
 	uri = spl_remove_index_internal(list, src);
 	spl_insert_index_internal(list, dest, uri);
 
-	result = spl_save(list, utf8path);
+	bool result = spl_save(list, utf8path, error_r);
 
 	spl_free(list);
 
@@ -291,78 +362,72 @@ spl_move_index(const char *utf8path, unsigned src, unsigned dest)
 	return result;
 }
 
-enum playlist_result
+bool
-spl_clear(const char *utf8path)
+spl_clear(const char *utf8path, GError **error_r)
 {
-	char *path_fs;
 	FILE *file;
 
-	if (map_spl_path() == NULL)
+	if (spl_map(error_r) == NULL)
-		return PLAYLIST_RESULT_DISABLED;
+		return false;
 
-	if (!spl_valid_name(utf8path))
+	char *path_fs = spl_map_to_fs(utf8path, error_r);
-		return PLAYLIST_RESULT_BAD_NAME;
-
-	path_fs = map_spl_utf8_to_fs(utf8path);
 	if (path_fs == NULL)
-		return PLAYLIST_RESULT_BAD_NAME;
+		return false;
 
 	file = fopen(path_fs, "w");
 	g_free(path_fs);
-	if (file == NULL)
+	if (file == NULL) {
-		return PLAYLIST_RESULT_ERRNO;
+		playlist_errno(error_r);
+		return false;
+	}
 
 	fclose(file);
 
 	idle_add(IDLE_STORED_PLAYLIST);
-	return PLAYLIST_RESULT_SUCCESS;
+	return true;
 }
 
-enum playlist_result
+bool
-spl_delete(const char *name_utf8)
+spl_delete(const char *name_utf8, GError **error_r)
 {
 	char *path_fs;
 	int ret;
 
-	if (map_spl_path() == NULL)
+	path_fs = spl_map_to_fs(name_utf8, error_r);
-		return PLAYLIST_RESULT_DISABLED;
-
-	if (!spl_valid_name(name_utf8))
-		return PLAYLIST_RESULT_BAD_NAME;
-
-	path_fs = map_spl_utf8_to_fs(name_utf8);
 	if (path_fs == NULL)
-		return PLAYLIST_RESULT_BAD_NAME;
+		return false;
 
 	ret = unlink(path_fs);
 	g_free(path_fs);
-	if (ret < 0)
+	if (ret < 0) {
-		return errno == ENOENT
+		playlist_errno(error_r);
-			? PLAYLIST_RESULT_NO_SUCH_LIST
+		return false;
-			: PLAYLIST_RESULT_ERRNO;
+	}
 
 	idle_add(IDLE_STORED_PLAYLIST);
-	return PLAYLIST_RESULT_SUCCESS;
+	return true;
 }
 
-enum playlist_result
+bool
-spl_remove_index(const char *utf8path, unsigned pos)
+spl_remove_index(const char *utf8path, unsigned pos, GError **error_r)
 {
-	GPtrArray *list;
 	char *uri;
-	enum playlist_result result;
 
-	if (!(list = spl_load(utf8path)))
+	GPtrArray *list = spl_load(utf8path, error_r);
-		return PLAYLIST_RESULT_NO_SUCH_LIST;
+	if (list == NULL)
+		return false;
 
 	if (pos >= list->len) {
 		spl_free(list);
-		return PLAYLIST_RESULT_BAD_RANGE;
+		g_set_error_literal(error_r, playlist_quark(),
+				    PLAYLIST_RESULT_BAD_RANGE,
+				    "Bad range");
+		return false;
 	}
 
 	uri = spl_remove_index_internal(list, pos);
 	g_free(uri);
-	result = spl_save(list, utf8path);
+	bool result = spl_save(list, utf8path, error_r);
 
 	spl_free(list);
 
@@ -370,38 +435,38 @@ spl_remove_index(const char *utf8path, unsigned pos)
 	return result;
 }
 
-enum playlist_result
+bool
-spl_append_song(const char *utf8path, struct song *song)
+spl_append_song(const char *utf8path, struct song *song, GError **error_r)
 {
 	FILE *file;
 	struct stat st;
-	char *path_fs;
 
-	if (map_spl_path() == NULL)
+	if (spl_map(error_r) == NULL)
-		return PLAYLIST_RESULT_DISABLED;
+		return false;
 
-	if (!spl_valid_name(utf8path))
+	char *path_fs = spl_map_to_fs(utf8path, error_r);
-		return PLAYLIST_RESULT_BAD_NAME;
-
-	path_fs = map_spl_utf8_to_fs(utf8path);
 	if (path_fs == NULL)
-		return PLAYLIST_RESULT_BAD_NAME;
+		return false;
 
 	file = fopen(path_fs, "a");
 	g_free(path_fs);
-	if (file == NULL)
+	if (file == NULL) {
-		return PLAYLIST_RESULT_ERRNO;
+		playlist_errno(error_r);
+		return false;
+	}
 
 	if (fstat(fileno(file), &st) < 0) {
-		int save_errno = errno;
+		playlist_errno(error_r);
 		fclose(file);
-		errno = save_errno;
+		return false;
-		return PLAYLIST_RESULT_ERRNO;
 	}
 
 	if (st.st_size / (MPD_PATH_MAX + 1) >= (off_t)playlist_max_length) {
 		fclose(file);
-		return PLAYLIST_RESULT_TOO_LARGE;
+		g_set_error_literal(error_r, playlist_quark(),
+				    PLAYLIST_RESULT_TOO_LARGE,
+				    "Stored playlist is too large");
+		return false;
 	}
 
 	playlist_print_song(file, song);
@@ -409,68 +474,79 @@ spl_append_song(const char *utf8path, struct song *song)
 	fclose(file);
 
 	idle_add(IDLE_STORED_PLAYLIST);
-	return PLAYLIST_RESULT_SUCCESS;
+	return true;
 }
 
-enum playlist_result
+bool
-spl_append_uri(const char *url, const char *utf8file)
+spl_append_uri(const char *url, const char *utf8file, GError **error_r)
 {
 	struct song *song;
 
 	if (uri_has_scheme(url)) {
-		enum playlist_result ret;
-
 		song = song_remote_new(url);
-		ret = spl_append_song(utf8file, song);
+		bool success = spl_append_song(utf8file, song, error_r);
 		song_free(song);
-		return ret;
+		return success;
 	} else {
 		song = db_get_song(url);
-		if (song == NULL)
+		if (song == NULL) {
-			return PLAYLIST_RESULT_NO_SUCH_SONG;
+			g_set_error_literal(error_r, playlist_quark(),
+					    PLAYLIST_RESULT_NO_SUCH_SONG,
+					    "No such song");
+			return false;
+		}
 
-		return spl_append_song(utf8file, song);
+		return spl_append_song(utf8file, song, error_r);
 	}
 }
 
-static enum playlist_result
+static bool
-spl_rename_internal(const char *from_path_fs, const char *to_path_fs)
+spl_rename_internal(const char *from_path_fs, const char *to_path_fs,
+		    GError **error_r)
 {
-	if (!g_file_test(from_path_fs, G_FILE_TEST_IS_REGULAR))
+	if (!g_file_test(from_path_fs, G_FILE_TEST_IS_REGULAR)) {
-		return PLAYLIST_RESULT_NO_SUCH_LIST;
+		g_set_error_literal(error_r, playlist_quark(),
+				    PLAYLIST_RESULT_NO_SUCH_LIST,
+				    "No such playlist");
+		return false;
+	}
 
-	if (g_file_test(to_path_fs, G_FILE_TEST_EXISTS))
+	if (g_file_test(to_path_fs, G_FILE_TEST_EXISTS)) {
-		return PLAYLIST_RESULT_LIST_EXISTS;
+		g_set_error_literal(error_r, playlist_quark(),
+				    PLAYLIST_RESULT_LIST_EXISTS,
+				    "Playlist exists already");
+		return false;
+	}
 
-	if (rename(from_path_fs, to_path_fs) < 0)
+	if (rename(from_path_fs, to_path_fs) < 0) {
-		return PLAYLIST_RESULT_ERRNO;
+		playlist_errno(error_r);
+		return false;
+	}
 
 	idle_add(IDLE_STORED_PLAYLIST);
-	return PLAYLIST_RESULT_SUCCESS;
+	return true;
 }
 
-enum playlist_result
+bool
-spl_rename(const char *utf8from, const char *utf8to)
+spl_rename(const char *utf8from, const char *utf8to, GError **error_r)
 {
-	char *from_path_fs, *to_path_fs;
+	if (spl_map(error_r) == NULL)
-	static enum playlist_result ret;
+		return false;
 
-	if (map_spl_path() == NULL)
+	char *from_path_fs = spl_map_to_fs(utf8from, error_r);
-		return PLAYLIST_RESULT_DISABLED;
+	if (from_path_fs == NULL)
+		return false;
 
-	if (!spl_valid_name(utf8from) || !spl_valid_name(utf8to))
+	char *to_path_fs = spl_map_to_fs(utf8to, error_r);
-		return PLAYLIST_RESULT_BAD_NAME;
+	if (to_path_fs == NULL) {
+		g_free(from_path_fs);
+		return false;
+	}
 
-	from_path_fs = map_spl_utf8_to_fs(utf8from);
+	bool success = spl_rename_internal(from_path_fs, to_path_fs, error_r);
-	to_path_fs = map_spl_utf8_to_fs(utf8to);
-
-	if (from_path_fs != NULL && to_path_fs != NULL)
-		ret = spl_rename_internal(from_path_fs, to_path_fs);
-	else
-		ret = PLAYLIST_RESULT_BAD_NAME;
 
 	g_free(from_path_fs);
 	g_free(to_path_fs);
 
-	return ret;
+	return success;
 }

src/stored_playlist.h

@@ -20,8 +20,6 @@
 #ifndef MPD_STORED_PLAYLIST_H
 #define MPD_STORED_PLAYLIST_H
 
-#include "playlist_error.h"
-
 #include <glib.h>
 #include <stdbool.h>
 #include <time.h>
@@ -54,36 +52,37 @@ spl_valid_name(const char *name_utf8);
  * NULL if an error occurred.
  */
 GPtrArray *
-spl_list(void);
+spl_list(GError **error_r);
 
 void
 spl_list_free(GPtrArray *list);
 
 GPtrArray *
-spl_load(const char *utf8path);
+spl_load(const char *utf8path, GError **error_r);
 
 void
 spl_free(GPtrArray *list);
 
-enum playlist_result
+bool
-spl_move_index(const char *utf8path, unsigned src, unsigned dest);
+spl_move_index(const char *utf8path, unsigned src, unsigned dest,
+	       GError **error_r);
 
-enum playlist_result
+bool
-spl_clear(const char *utf8path);
+spl_clear(const char *utf8path, GError **error_r);
 
-enum playlist_result
+bool
-spl_delete(const char *name_utf8);
+spl_delete(const char *name_utf8, GError **error_r);
 
-enum playlist_result
+bool
-spl_remove_index(const char *utf8path, unsigned pos);
+spl_remove_index(const char *utf8path, unsigned pos, GError **error_r);
 
-enum playlist_result
+bool
-spl_append_song(const char *utf8path, struct song *song);
+spl_append_song(const char *utf8path, struct song *song, GError **error_r);
 
-enum playlist_result
+bool
-spl_append_uri(const char *file, const char *utf8file);
+spl_append_uri(const char *file, const char *utf8file, GError **error_r);
 
-enum playlist_result
+bool
-spl_rename(const char *utf8from, const char *utf8to);
+spl_rename(const char *utf8from, const char *utf8to, GError **error_r);
 
 #endif