SongFilter: use std::chrono::system_clock::time_point instead of time_t

src/SongFilter.cxx

@@ -22,6 +22,7 @@
 #include "db/LightSong.hxx"
 #include "DetachedSong.hxx"
 #include "tag/ParseName.hxx"
+#include "util/ChronoUtil.hxx"
 #include "util/ConstBuffer.hxx"
 #include "util/StringAPI.hxx"
 #include "util/ASCII.hxx"
@@ -71,7 +72,8 @@ SongFilter::Item::Item(unsigned _tag, const char *_value, bool _fold_case)
 {
 }
 
-SongFilter::Item::Item(unsigned _tag, time_t _time)
+SongFilter::Item::Item(unsigned _tag,
+		       std::chrono::system_clock::time_point _time)
 	:tag(_tag), value(nullptr), time(_time)
 {
 }
@@ -145,7 +147,7 @@ SongFilter::Item::Match(const DetachedSong &song) const noexcept
 		return uri_is_child_or_same(value.c_str(), song.GetURI());
 
 	if (tag == LOCATE_TAG_MODIFIED_SINCE)
-		return song.GetLastModified() >= std::chrono::system_clock::from_time_t(time);
+		return song.GetLastModified() >= time;
 
 	if (tag == LOCATE_TAG_FILE_TYPE)
 		return StringMatch(song.GetURI());
@@ -162,7 +164,7 @@ SongFilter::Item::Match(const LightSong &song) const noexcept
 	}
 
 	if (tag == LOCATE_TAG_MODIFIED_SINCE)
-		return song.mtime >= std::chrono::system_clock::from_time_t(time);
+		return song.mtime >= time;
 
 	if (tag == LOCATE_TAG_FILE_TYPE) {
 		const auto uri = song.GetURI();
@@ -183,8 +185,8 @@ SongFilter::~SongFilter()
 }
 
 gcc_pure
-static time_t
-ParseTimeStamp(const char *s) noexcept
+static std::chrono::system_clock::time_point
+ParseTimeStamp(const char *s)
 {
 	assert(s != nullptr);
 
@@ -192,14 +194,13 @@ ParseTimeStamp(const char *s) noexcept
 	unsigned long long value = strtoull(s, &endptr, 10);
 	if (*endptr == 0 && endptr > s)
 		/* it's an integral UNIX time stamp */
-		return (time_t)value;
+		return std::chrono::system_clock::from_time_t((time_t)value);
 
 	try {
 		/* try ISO 8601 */
-		const auto t = ParseTimePoint(s, "%FT%TZ");
-		return std::chrono::system_clock::to_time_t(t);
+		return ParseTimePoint(s, "%FT%TZ");
 	} catch (const std::runtime_error &) {
-		return 0;
+		return std::chrono::system_clock::time_point::min();
 	}
 }
 
@@ -219,8 +220,8 @@ SongFilter::Parse(const char *tag_string, const char *value, bool fold_case)
 	}
 
 	if (tag == LOCATE_TAG_MODIFIED_SINCE) {
-		time_t t = ParseTimeStamp(value);
-		if (t == 0)
+		const auto t = ParseTimeStamp(value);
+		if (IsNegative(t))
 			return false;
 
 		items.push_back(Item(tag, t));

src/SongFilter.hxx

@@ -24,9 +24,9 @@
 #include "Compiler.h"
 
 #include <list>
+#include <chrono>
 
 #include <stdint.h>
-#include <time.h>
 
 /**
  * Limit the search to files within the given directory.
@@ -55,12 +55,12 @@ public:
 		/**
 		 * For #LOCATE_TAG_MODIFIED_SINCE
 		 */
-		time_t time;
+		std::chrono::system_clock::time_point time;
 
 	public:
 		gcc_nonnull(3)
 		Item(unsigned tag, const char *value, bool fold_case=false);
-		Item(unsigned tag, time_t time);
+		Item(unsigned tag, std::chrono::system_clock::time_point time);
 
 		Item(const Item &other) = delete;
 		Item(Item &&) = default;