mirror/fmt
1
0
Fork 0
mirror of https://github.com/fmtlib/fmt.git synced 2024-11-19 20:18:49 +00:00
Code Issues Packages Projects Releases Wiki Activity

Fix an overflow when formatting very large durations

Browse Source
This commit is contained in:
Victor Zverovich 2021-12-23 09:59:15 -08:00
parent fc2a376d8e
commit 784e2a7b42
1 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
include/fmt/chrono.h
View File

@ -1663,15 +1663,16 @@ struct chrono_formatter {
if (std::ratio_less<typename subsecond_precision::period,
std::chrono::seconds::period>::value) {
*out++ = '.';
// Don't convert long double to integer seconds to avoid overflow.
using sec = conditional_t<
std::is_same<typename Duration::rep, long double>::value,
std::chrono::duration<long double>, std::chrono::seconds>;
auto fractional = detail::abs(d) - std::chrono::duration_cast<sec>(d);
const auto subseconds =
std::chrono::treat_as_floating_point<
typename subsecond_precision::rep>::value
? (detail::abs(d) -
std::chrono::duration_cast<std::chrono::seconds>(d))
.count()
: std::chrono::duration_cast<subsecond_precision>(
detail::abs(d) -
std::chrono::duration_cast<std::chrono::seconds>(d))
? fractional.count()
: std::chrono::duration_cast<subsecond_precision>(fractional)
.count();
uint32_or_64_or_128_t<long long> n =
to_unsigned(to_nonnegative_int(subseconds, max_value<long long>()));