stdtime/FreeBSD/tzfile.h.patch

   1 --- tzfile.h.orig       2010-01-15 00:06:58.000000000 -0800
   2 +++ tzfile.h    2010-01-15 00:07:28.000000000 -0800
   3 @@ -38,7 +38,11 @@ static char  tzfilehid[] = "@(#)tzfile.h
   4  #endif /* !defined TZDIR */
   5
   6  #ifndef TZDEFAULT
   7 +#ifdef UNIFDEF_MOVE_LOCALTIME
   8 +#define TZDEFAULT      "/var/db/timezone/localtime"
   9 +#else /* !UNIFDEF_MOVE_LOCALTIME */
  10  #define TZDEFAULT      "/etc/localtime"
  11 +#endif /* UNIFDEF_MOVE_LOCALTIME */
  12  #endif /* !defined TZDEFAULT */
  13
  14  #ifndef TZDEFRULES
  15 @@ -167,6 +171,20 @@ struct tzhead {
  16
  17  #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
  18
  19 +/*
  20 +** Since everything in isleap is modulo 400 (or a factor of 400), we know that
  21 +**     isleap(y) == isleap(y % 400)
  22 +** and so
  23 +**     isleap(a + b) == isleap((a + b) % 400)
  24 +** or
  25 +**     isleap(a + b) == isleap(a % 400 + b % 400)
  26 +** This is true even if % means modulo rather than Fortran remainder
  27 +** (which is allowed by C89 but not C99).
  28 +** We use this to avoid addition overflow problems.
  29 +*/
  30 +
  31 +#define isleap_sum(a, b)       isleap((a) % 400 + (b) % 400)
  32 +
  33  #ifndef USG
  34
  35  /*