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Restrict the range of year:

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to within the range of chrono::minutes.
* This prevents overflow when adding minutes to day_point
  when minutes is stored in 32 bits.
* Also added static checks on the range of hours and seconds.
  If these static checks fire, the range of year should be
  further reduced.
* This does not impact gcc at all.  It impacts clang only
  when targeting 32 bit architectures.  And it fixes
  overflow on Visual Studio.
* Thanks much to https://github.com/gmcode for the herculean
  effort in tracking this down.
This commit is contained in:
Howard Hinnant 2015-08-01 16:41:03 -04:00
parent 17bd48d23c
commit 2e715844bb
1 changed files with 13 additions and 2 deletions
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15
date.h
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@ -6,6 +6,7 @@
// http://creativecommons.org/licenses/by/4.0/
#include <chrono>
#include <climits>
#if !(__cplusplus >= 201402)
# include <cmath>
#endif
@ -1161,7 +1162,12 @@ inline
year
year::min() noexcept
{
return year{std::numeric_limits<short>::min()};
using namespace std::chrono;
static_assert(sizeof(seconds)*CHAR_BIT >= 41, "seconds may overflow");
static_assert(sizeof(hours)*CHAR_BIT >= 30, "hours may overflow");
return sizeof(minutes)*CHAR_BIT < 34 ?
year{1970} + duration_cast<years>(minutes::min()) :
year{std::numeric_limits<short>::min()};
}
CONSTCD11
@ -1169,7 +1175,12 @@ inline
year
year::max() noexcept
{
return year{std::numeric_limits<short>::max()};
using namespace std::chrono;
static_assert(sizeof(seconds)*CHAR_BIT >= 41, "seconds may overflow");
static_assert(sizeof(hours)*CHAR_BIT >= 30, "hours may overflow");
return sizeof(minutes)*CHAR_BIT < 34 ?
year{1969} + duration_cast<years>(minutes::max()) :
year{std::numeric_limits<short>::max()};
}
CONSTCD11