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time: truncate fractional seconds longer than 9 digits

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Fixes #48685
This commit is contained in:
Alexander Yastrebov 2021-10-03 17:24:56 +02:00
parent 3bbc82371e
commit 4d985192c5
2 changed files with 47 additions and 3 deletions
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9
src/time/format.go
View File

@ -1420,16 +1420,19 @@ func parseNanoseconds(value string, nbytes int) (ns int, rangeErrString string,
err = errBad
return
}
if nbytes > 10 {
value = value[:10]
nbytes = 10
}
if ns, err = atoi(value[1:nbytes]); err != nil {
return
}
if ns < 0 || 1e9 <= ns {
if ns < 0 {
rangeErrString = "fractional second"
return
}
// We need nanoseconds, which means scaling by the number
// of missing digits in the format, maximum length 10. If it's
// longer than 10, we won't scale.
// of missing digits in the format, maximum length 10.
scaleDigits := 10 - nbytes
for i := 0; i < scaleDigits; i++ {
ns *= 10

41
src/time/format_test.go
View File

@ -852,3 +852,44 @@ func TestFormatFractionalSecondSeparators(t *testing.T) {
}
}
}
// Issue 48685
func TestParseFractionalSecondsLongerThanNineDigits(t *testing.T) {
tests := []struct {
s string
want int
}{
// 9 digits
{"2021-09-29T16:04:33.000000000Z", 0},
{"2021-09-29T16:04:33.000000001Z", 1},
{"2021-09-29T16:04:33.100000000Z", 100_000_000},
{"2021-09-29T16:04:33.100000001Z", 100_000_001},
{"2021-09-29T16:04:33.999999999Z", 999_999_999},
{"2021-09-29T16:04:33.012345678Z", 12_345_678},
// 10 digits, truncates
{"2021-09-29T16:04:33.0000000000Z", 0},
{"2021-09-29T16:04:33.0000000001Z", 0},
{"2021-09-29T16:04:33.1000000000Z", 100_000_000},
{"2021-09-29T16:04:33.1000000009Z", 100_000_000},
{"2021-09-29T16:04:33.9999999999Z", 999_999_999},
{"2021-09-29T16:04:33.0123456789Z", 12_345_678},
// 11 digits, truncates
{"2021-09-29T16:04:33.10000000000Z", 100_000_000},
{"2021-09-29T16:04:33.00123456789Z", 1_234_567},
// 12 digits, truncates
{"2021-09-29T16:04:33.000123456789Z", 123_456},
// 15 digits, truncates
{"2021-09-29T16:04:33.9999999999999999Z", 999_999_999},
}
for _, tt := range tests {
tm, err := Parse(RFC3339, tt.s)
if err != nil {
t.Errorf("Unexpected error: %v", err)
continue
}
if got := tm.Nanosecond(); got != tt.want {
t.Errorf("Parse(%q) = got %d, want %d", tt.s, got, tt.want)
}
}
}