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Avoid signed integral overflow in to_stream

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Fixes: #696
This commit is contained in:
Howard Hinnant 2021-08-31 17:42:18 -04:00
parent 1ff7208036
commit e1aa4837e0
1 changed files with 14 additions and 4 deletions
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18
include/date/date.h
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@ -6213,8 +6213,13 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
const std::chrono::seconds* offset_sec = nullptr)
{
using CT = typename std::common_type<Duration, std::chrono::seconds>::type;
auto ld = floor<days>(tp);
fields<CT> fds{year_month_day{ld}, hh_mm_ss<CT>{tp-local_seconds{ld}}};
auto ld = std::chrono::time_point_cast<days>(tp);
fields<CT> fds;
if (ld <= tp)
fds = fields<CT>{year_month_day{ld}, hh_mm_ss<CT>{tp-local_seconds{ld}}};
else
fds = fields<CT>{year_month_day{ld - days{1}},
hh_mm_ss<CT>{days{1} - (local_seconds{ld} - tp)}};
return to_stream(os, fmt, fds, abbrev, offset_sec);
}
@ -6227,8 +6232,13 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
using CT = typename std::common_type<Duration, seconds>::type;
const std::string abbrev("UTC");
CONSTDATA seconds offset{0};
auto sd = floor<days>(tp);
fields<CT> fds{year_month_day{sd}, hh_mm_ss<CT>{tp-sys_seconds{sd}}};
auto sd = std::chrono::time_point_cast<days>(tp);
fields<CT> fds;
if (sd <= tp)
fds = fields<CT>{year_month_day{sd}, hh_mm_ss<CT>{tp-sys_seconds{sd}}};
else
fds = fields<CT>{year_month_day{sd - days{1}},
hh_mm_ss<CT>{days{1} - (sys_seconds{sd} - tp)}};
return to_stream(os, fmt, fds, &abbrev, &offset);
}