uutils/coreutils
date: strftime ignores flags and widths on %N (nanoseconds)
Aberta
#11.658 aberto em 5 de abr. de 2026
U - datefuzzinggood first issue
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Description
Summary
GNU date honours strftime flags and widths on %N (nanoseconds). uutils ignores or mishandles them: %_3N should space-pad to width 3, and %-N should still emit the full 9-digit default, but uutils emits a single 0.
Found by a fuzz_date run.
Reproduction
$ LC_ALL=C TZ=UTC /usr/bin/date -d '@0' '+%_3N' | od -c | head -1
0000000 0 \n
$ LC_ALL=C TZ=UTC target/debug/coreutils date -d '@0' '+%_3N' | od -c | head -1
0000000 0 \n
$ LC_ALL=C TZ=UTC /usr/bin/date -d '@0' '+%-N'
000000000
$ LC_ALL=C TZ=UTC target/debug/coreutils date -d '@0' '+%-N'
0
Test
#[test]
fn test_date_strftime_n_width_and_flags() {
new_ucmd!()
.env("LC_ALL", "C")
.env("TZ", "UTC")
.arg("-d")
.arg("@0")
.arg("+%_3N")
.succeeds()
.stdout_is("0 \n");
new_ucmd!()
.env("LC_ALL", "C")
.env("TZ", "UTC")
.arg("-d")
.arg("@0")
.arg("+%-N")
.succeeds()
.stdout_is("000000000\n");
}