*Save, *State: use the OutputStream API instead of FILE*

src/db/plugins/simple/DatabaseSave.cxx

@@ -23,6 +23,7 @@
 #include "db/DatabaseError.hxx"
 #include "Directory.hxx"
 #include "DirectorySave.hxx"
+#include "fs/output/BufferedOutputStream.hxx"
 #include "fs/TextFile.hxx"
 #include "tag/Tag.hxx"
 #include "tag/TagSettings.h"
@@ -49,20 +50,20 @@ static constexpr unsigned DB_FORMAT = 2;
 static constexpr unsigned OLDEST_DB_FORMAT = 1;
 
 void
-db_save_internal(FILE *fp, const Directory &music_root)
+db_save_internal(BufferedOutputStream &os, const Directory &music_root)
 {
-	fprintf(fp, "%s\n", DIRECTORY_INFO_BEGIN);
-	fprintf(fp, DB_FORMAT_PREFIX "%u\n", DB_FORMAT);
-	fprintf(fp, "%s%s\n", DIRECTORY_MPD_VERSION, VERSION);
-	fprintf(fp, "%s%s\n", DIRECTORY_FS_CHARSET, GetFSCharset());
+	os.Format("%s\n", DIRECTORY_INFO_BEGIN);
+	os.Format(DB_FORMAT_PREFIX "%u\n", DB_FORMAT);
+	os.Format("%s%s\n", DIRECTORY_MPD_VERSION, VERSION);
+	os.Format("%s%s\n", DIRECTORY_FS_CHARSET, GetFSCharset());
 
 	for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
 		if (!ignore_tag_items[i])
-			fprintf(fp, DB_TAG_PREFIX "%s\n", tag_item_names[i]);
+			os.Format(DB_TAG_PREFIX "%s\n", tag_item_names[i]);
 
-	fprintf(fp, "%s\n", DIRECTORY_INFO_END);
+	os.Format("%s\n", DIRECTORY_INFO_END);
 
-	directory_save(fp, music_root);
+	directory_save(os, music_root);
 }
 
 bool

src/db/plugins/simple/DatabaseSave.hxx

@@ -20,14 +20,13 @@
 #ifndef MPD_DATABASE_SAVE_HXX
 #define MPD_DATABASE_SAVE_HXX
 
-#include <stdio.h>
-
 struct Directory;
+class BufferedOutputStream;
 class TextFile;
 class Error;
 
 void
-db_save_internal(FILE *file, const Directory &root);
+db_save_internal(BufferedOutputStream &os, const Directory &root);
 
 bool
 db_load_internal(TextFile &file, Directory &root, Error &error);

src/db/plugins/simple/DirectorySave.cxx

@@ -25,6 +25,7 @@
 #include "DetachedSong.hxx"
 #include "PlaylistDatabase.hxx"
 #include "fs/TextFile.hxx"
+#include "fs/output/BufferedOutputStream.hxx"
 #include "util/StringUtil.hxx"
 #include "util/NumberParser.hxx"
 #include "util/Error.hxx"
@@ -70,37 +71,37 @@ ParseTypeString(const char *type)
 }
 
 void
-directory_save(FILE *fp, const Directory &directory)
+directory_save(BufferedOutputStream &os, const Directory &directory)
 {
 	if (!directory.IsRoot()) {
 		const char *type = DeviceToTypeString(directory.device);
 		if (type != nullptr)
-			fprintf(fp, DIRECTORY_TYPE "%s\n", type);
+			os.Format(DIRECTORY_TYPE "%s\n", type);
 
 		if (directory.mtime != 0)
-			fprintf(fp, DIRECTORY_MTIME "%lu\n",
-				(unsigned long)directory.mtime);
+			os.Format(DIRECTORY_MTIME "%lu\n",
+				  (unsigned long)directory.mtime);
 
-		fprintf(fp, "%s%s\n", DIRECTORY_BEGIN, directory.GetPath());
+		os.Format("%s%s\n", DIRECTORY_BEGIN, directory.GetPath());
 	}
 
 	for (const auto &child : directory.children) {
-		fprintf(fp, DIRECTORY_DIR "%s\n", child.GetName());
+		os.Format(DIRECTORY_DIR "%s\n", child.GetName());
 
 		if (!child.IsMount())
-			directory_save(fp, child);
+			directory_save(os, child);
 
-		if (ferror(fp))
+		if (!os.Check())
 			return;
 	}
 
 	for (const auto &song : directory.songs)
-		song_save(fp, song);
+		song_save(os, song);
 
-	playlist_vector_save(fp, directory.playlists);
+	playlist_vector_save(os, directory.playlists);
 
 	if (!directory.IsRoot())
-		fprintf(fp, DIRECTORY_END "%s\n", directory.GetPath());
+		os.Format(DIRECTORY_END "%s\n", directory.GetPath());
 }
 
 static bool

src/db/plugins/simple/DirectorySave.hxx

@@ -20,14 +20,13 @@
 #ifndef MPD_DIRECTORY_SAVE_HXX
 #define MPD_DIRECTORY_SAVE_HXX
 
-#include <stdio.h>
-
 struct Directory;
 class TextFile;
+class BufferedOutputStream;
 class Error;
 
 void
-directory_save(FILE *fp, const Directory &directory);
+directory_save(BufferedOutputStream &os, const Directory &directory);
 
 bool
 directory_load(TextFile &file, Directory &directory, Error &error);

src/db/plugins/simple/SimpleDatabasePlugin.cxx

@@ -32,6 +32,8 @@
 #include "db/DatabaseLock.hxx"
 #include "db/DatabaseError.hxx"
 #include "fs/TextFile.hxx"
+#include "fs/output/BufferedOutputStream.hxx"
+#include "fs/output/FileOutputStream.hxx"
 #include "config/ConfigData.hxx"
 #include "fs/FileSystem.hxx"
 #include "util/CharUtil.hxx"
@@ -366,22 +368,16 @@ SimpleDatabase::Save(Error &error)
 
 	LogDebug(simple_db_domain, "writing DB");
 
-	FILE *fp = FOpen(path, FOpenMode::WriteText);
-	if (!fp) {
-		error.FormatErrno("unable to write to db file \"%s\"",
-				  path_utf8.c_str());
+	FileOutputStream fos(path, error);
+	if (!fos.IsDefined())
 		return false;
-	}
 
-	db_save_internal(fp, *root);
+	BufferedOutputStream bos(fos);
 
-	if (ferror(fp)) {
-		error.SetErrno("Failed to write to database file");
-		fclose(fp);
+	db_save_internal(bos, *root);
+
+	if (!bos.Flush(error) || !fos.Commit(error))
 		return false;
-	}
-
-	fclose(fp);
 
 	struct stat st;
 	if (StatFile(path, st))