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

src/db/DatabasePrint.cxx

@@ -34,6 +34,7 @@
 #include "PlaylistInfo.hxx"
 #include "Interface.hxx"
 #include "fs/Traits.hxx"
+#include "util/ChronoUtil.hxx"
 
 #include <functional>
 
@@ -134,7 +135,7 @@ PrintPlaylistFull(Response &r, bool base,
 	print_playlist_in_directory(r, base,
 				    &directory, playlist.name.c_str());
 
-	if (playlist.mtime > 0)
+	if (!IsNegative(playlist.mtime))
 		time_print(r, "Last-Modified", playlist.mtime);
 }
 

src/db/PlaylistInfo.hxx

@@ -24,8 +24,7 @@
 #include "Compiler.h"
 
 #include <string>
-
-#include <sys/time.h>
+#include <chrono>
 
 /**
  * A directory entry pointing to a playlist file.
@@ -36,7 +35,12 @@ struct PlaylistInfo {
 	 */
 	std::string name;
 
-	time_t mtime;
+	/**
+	 * The time stamp of the last file modification.  A negative
+	 * value means that this is unknown/unavailable.
+	 */
+	std::chrono::system_clock::time_point mtime =
+		std::chrono::system_clock::time_point::min();
 
 	class CompareName {
 		const char *const name;
@@ -53,7 +57,8 @@ struct PlaylistInfo {
 	PlaylistInfo() = default;
 
 	template<typename N>
-	PlaylistInfo(N &&_name, time_t _mtime)
+	explicit PlaylistInfo(N &&_name,
+			      std::chrono::system_clock::time_point _mtime=std::chrono::system_clock::time_point::min())
 		:name(std::forward<N>(_name)), mtime(_mtime) {}
 
 	PlaylistInfo(const PlaylistInfo &other) = delete;

src/db/plugins/ProxyDatabasePlugin.cxx

@@ -603,8 +603,12 @@ Visit(const struct mpd_playlist *playlist,
 	if (!visit_playlist)
 		return;
 
+	time_t mtime = mpd_playlist_get_last_modified(playlist);
+
 	PlaylistInfo p(mpd_playlist_get_path(playlist),
-		       mpd_playlist_get_last_modified(playlist));
+		       mtime > 0
+		       ? std::chrono::system_clock::from_time_t(mtime)
+		       : std::chrono::system_clock::time_point::min());
 
 	visit_playlist(p, LightDirectory::Root());
 }

src/db/update/Walk.cxx

@@ -192,7 +192,7 @@ UpdateWalk::UpdatePlaylistFile(Directory &directory,
 	if (!playlist_suffix_supported(suffix))
 		return false;
 
-	PlaylistInfo pi(name, std::chrono::system_clock::to_time_t(info.mtime));
+	PlaylistInfo pi(name, info.mtime);
 
 	const ScopeDatabaseLock protect;
 	if (directory.playlists.UpdateOrInsert(std::move(pi)))