From c6bb003b8882e9a16941f5803d072ec1cb728318 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Tue, 4 Jun 2024 12:52:39 -0400
Subject: xtime: Add support for @epochseconds timestamps

---
 src/xtime.c       | 18 ++++++++++++++++++
 tests/gnu/used.sh | 31 ++++++-------------------------
 tests/run.sh      |  6 ++++++
 3 files changed, 30 insertions(+), 25 deletions(-)

diff --git a/src/xtime.c b/src/xtime.c
index 2808455..186651b 100644
--- a/src/xtime.c
+++ b/src/xtime.c
@@ -206,6 +206,23 @@ static int xgetpart(const char **str, size_t n, int *result) {
 }
 
 int xgetdate(const char *str, struct timespec *result) {
+	// Handle @epochseconds
+	if (str[0] == '@') {
+		long long value;
+		if (xstrtoll(str + 1, NULL, 10, &value) != 0) {
+			goto error;
+		}
+
+		time_t time = (time_t)value;
+		if ((long long)time != value) {
+			errno = ERANGE;
+			goto error;
+		}
+
+		result->tv_sec = time;
+		goto done;
+	}
+
 	struct tm tm = {
 		.tm_isdst = -1,
 	};
@@ -324,6 +341,7 @@ end:
 		}
 	}
 
+done:
 	result->tv_nsec = 0;
 	return 0;
 
diff --git a/tests/gnu/used.sh b/tests/gnu/used.sh
index 5e5d4e9..fe0a778 100644
--- a/tests/gnu/used.sh
+++ b/tests/gnu/used.sh
@@ -1,37 +1,18 @@
-iso8601() {
-    printf '%04d-%02d-%02dT%02d:%02d:%02d\n' "$@"
-}
-
 cd "$TEST"
 
-now=$(date '+%Y-%m-%dT%H:%M:%S')
-
-# Parse the current date
-[[ "$now" =~ ^([0-9]{4})-([0-9]{2})-([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})$ ]] || fail
-# Treat leading zeros as decimal, not octal
-YYYY=$((10#${BASH_REMATCH[1]}))
-MM=$((10#${BASH_REMATCH[2]}))
-DD=$((10#${BASH_REMATCH[3]}))
-hh=$((10#${BASH_REMATCH[4]}))
-mm=$((10#${BASH_REMATCH[5]}))
-ss=$((10#${BASH_REMATCH[6]}))
+now=$(epoch_time)
 
 # -used is always false if atime < ctime
-yesterday=$(iso8601 $YYYY $MM $((DD - 1)) $hh $mm $ss)
-"$XTOUCH" -at "$yesterday" yesterday
+"$XTOUCH" -at "@$((now - 60 * 60 * 24))" yesterday
 
 # -used rounds up
-tomorrow=$(iso8601 $YYYY $MM $DD $((hh + 1)) $mm $ss)
-"$XTOUCH" -at "$tomorrow" tomorrow
+"$XTOUCH" -at "@$((now + 60 * 60))" tomorrow
 
-dayafter=$(iso8601 $YYYY $MM $((DD + 1)) $((hh + 1)) $mm $ss)
-"$XTOUCH" -at "$dayafter" dayafter
+"$XTOUCH" -at "@$((now + 60 * 60 * 25))" dayafter
 
-nextweek=$(iso8601 $YYYY $MM $((DD + 6)) $((hh + 1)) $mm $ss)
-"$XTOUCH" -at "$nextweek" nextweek
+"$XTOUCH" -at "@$((now + 60 * 60 * (24 * 6 + 1)))" nextweek
 
-nextyear=$(iso8601 $((YYYY + 1)) $MM $DD $hh $mm $ss)
-"$XTOUCH" -at "$nextyear" nextyear
+"$XTOUCH" -at "@$((now + 60 * 60 * 24 * 365))" nextyear
 
 bfs_diff -mindepth 1 \
     -a -used 1 -printf '-used 1: %p\n' \
diff --git a/tests/run.sh b/tests/run.sh
index 8c1402d..115a036 100644
--- a/tests/run.sh
+++ b/tests/run.sh
@@ -410,6 +410,12 @@ make_xattrs() {
     esac
 }
 
+# Get the Unix epoch time in seconds
+epoch_time() {
+    # https://stackoverflow.com/a/12746260/502399
+    awk 'BEGIN { srand(); print srand(); }'
+}
+
 ## Snapshot testing
 
 # Return value when a difference is detected
-- 
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