db/LightDirectory: use std::chrono::system_clock::time_point

src/db/DatabasePrint.cxx

@@ -66,7 +66,7 @@ PrintDirectoryFull(Response &r, bool base, const LightDirectory &directory)
 	if (!directory.IsRoot()) {
 		PrintDirectoryURI(r, base, directory);
 
-		if (directory.mtime > 0)
+		if (!IsNegative(directory.mtime))
 			time_print(r, "Last-Modified", directory.mtime);
 	}
 }

src/db/LightDirectory.hxx

@@ -39,13 +39,14 @@ struct Tag;
 struct LightDirectory {
 	const char *uri;
 
-	time_t mtime;
+	std::chrono::system_clock::time_point mtime;
 
-	constexpr LightDirectory(const char *_uri, time_t _mtime)
+	constexpr LightDirectory(const char *_uri,
+				 std::chrono::system_clock::time_point _mtime)
 		:uri(_uri), mtime(_mtime) {}
 
 	static constexpr LightDirectory Root() noexcept {
-		return LightDirectory("", 0);
+		return LightDirectory("", std::chrono::system_clock::time_point::min());
 	}
 
 	bool IsRoot() const noexcept {

src/db/plugins/ProxyDatabasePlugin.cxx

@@ -562,10 +562,13 @@ Visit(struct mpd_connection *connection,
       VisitPlaylist visit_playlist)
 {
 	const char *path = mpd_directory_get_path(directory);
+
+	std::chrono::system_clock::time_point mtime =
+		std::chrono::system_clock::time_point::min();
 #if LIBMPDCLIENT_CHECK_VERSION(2,9,0)
-	time_t mtime = mpd_directory_get_last_modified(directory);
-#else
-	time_t mtime = 0;
+	time_t _mtime = mpd_directory_get_last_modified(directory);
+	if (_mtime > 0)
+		mtime = std::chrono::system_clock::from_time_t(_mtime);
 #endif
 
 	if (visit_directory)

src/db/plugins/simple/Directory.hxx

@@ -85,7 +85,10 @@ struct Directory {
 	PlaylistVector playlists;
 
 	Directory *const parent;
-	time_t mtime = 0;
+
+	std::chrono::system_clock::time_point mtime =
+		std::chrono::system_clock::time_point::min();
+
 	uint64_t inode = 0, device = 0;
 
 	const std::string path;

src/db/plugins/simple/DirectorySave.cxx

@@ -26,6 +26,7 @@
 #include "PlaylistDatabase.hxx"
 #include "fs/io/TextFile.hxx"
 #include "fs/io/BufferedOutputStream.hxx"
+#include "util/ChronoUtil.hxx"
 #include "util/StringCompare.hxx"
 #include "util/NumberParser.hxx"
 #include "util/RuntimeError.hxx"
@@ -74,9 +75,9 @@ directory_save(BufferedOutputStream &os, const Directory &directory)
 		if (type != nullptr)
 			os.Format(DIRECTORY_TYPE "%s\n", type);
 
-		if (directory.mtime != 0)
+		if (!IsNegative(directory.mtime))
 			os.Format(DIRECTORY_MTIME "%lu\n",
-				  (unsigned long)directory.mtime);
+				  (unsigned long)std::chrono::system_clock::to_time_t(directory.mtime));
 
 		os.Format("%s%s\n", DIRECTORY_BEGIN, directory.GetPath());
 	}
@@ -102,7 +103,9 @@ ParseLine(Directory &directory, const char *line)
 {
 	const char *p;
 	if ((p = StringAfterPrefix(line, DIRECTORY_MTIME))) {
-		directory.mtime = ParseUint64(p);
+		const auto mtime = ParseUint64(p);
+		if (mtime > 0)
+			directory.mtime = std::chrono::system_clock::from_time_t(mtime);
 	} else if ((p = StringAfterPrefix(line, DIRECTORY_TYPE))) {
 		directory.device = ParseTypeString(p);
 	} else

src/db/plugins/upnp/UpnpDatabasePlugin.cxx

@@ -477,7 +477,8 @@ VisitObject(const UPnPDirObject &object, const char *uri,
 
 	case UPnPDirObject::Type::CONTAINER:
 		if (visit_directory)
-			visit_directory(LightDirectory(uri, 0));
+			visit_directory(LightDirectory(uri,
+						       std::chrono::system_clock::time_point::min()));
 		break;
 
 	case UPnPDirObject::Type::ITEM:
@@ -582,7 +583,8 @@ UpnpDatabase::Visit(const DatabaseSelection &selection,
 	if (vpath.empty()) {
 		for (const auto &server : discovery->GetDirectories()) {
 			if (visit_directory) {
-				const LightDirectory d(server.getFriendlyName(), 0);
+				const LightDirectory d(server.getFriendlyName(),
+						       std::chrono::system_clock::time_point::min());
 				visit_directory(d);
 			}
 

src/db/update/Archive.cxx

@@ -137,7 +137,7 @@ UpdateWalk::UpdateArchiveFile(Directory &parent, const char *name,
 {
 	Directory *directory = LockFindChild(parent, name);
 
-	if (directory != nullptr && directory->mtime == std::chrono::system_clock::to_time_t(info.mtime) &&
+	if (directory != nullptr && directory->mtime == info.mtime &&
 	    !walk_discard)
 		/* MPD has already scanned the archive, and it hasn't
 		   changed since - don't consider updating it */
@@ -173,7 +173,7 @@ UpdateWalk::UpdateArchiveFile(Directory &parent, const char *name,
 		directory->device = DEVICE_INARCHIVE;
 	}
 
-	directory->mtime = std::chrono::system_clock::to_time_t(info.mtime);
+	directory->mtime = info.mtime;
 
 	UpdateArchiveVisitor visitor(*this, *file, directory);
 	file->Visit(visitor);

src/db/update/Container.cxx

@@ -43,7 +43,7 @@ UpdateWalk::MakeDirectoryIfModified(Directory &parent, const char *name,
 		if (directory->IsMount())
 			return nullptr;
 
-		if (directory->mtime == std::chrono::system_clock::to_time_t(info.mtime) && !walk_discard) {
+		if (directory->mtime == info.mtime && !walk_discard) {
 			/* not modified */
 			return nullptr;
 		}
@@ -53,7 +53,7 @@ UpdateWalk::MakeDirectoryIfModified(Directory &parent, const char *name,
 	}
 
 	directory = parent.MakeChild(name);
-	directory->mtime = std::chrono::system_clock::to_time_t(info.mtime);
+	directory->mtime = info.mtime;
 	return directory;
 }
 

src/db/update/Walk.cxx

@@ -382,7 +382,7 @@ UpdateWalk::UpdateDirectory(Directory &directory,
 		UpdateDirectoryChild(directory, child_exclude_list, name_utf8, info2);
 	}
 
-	directory.mtime = std::chrono::system_clock::to_time_t(info.mtime);
+	directory.mtime = info.mtime;
 
 	return true;
 }