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Revert "Use 64-bit years"

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This reverts commit cfc3a953ae.
This commit is contained in:
Justine Tunney 2022-05-12 06:11:22 -07:00
parent cf73bbd678
commit dd9ab01d25
13 changed files with 484 additions and 544 deletions
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31
libc/time/tz.internal.h
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@ -5,7 +5,6 @@
#include "libc/errno.h"
#include "libc/inttypes.h"
#include "libc/limits.h"
#include "libc/macros.internal.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/ok.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
@ -378,6 +377,7 @@ int64_t time2posix_z(timezone_t, int64_t) nosideeffect;
*/
#define TYPE_BIT(type) (sizeof(type) * CHAR_BIT)
#define TYPE_SIGNED(type) (((type) -1) < 0)
#define TWOS_COMPLEMENT(t) ((t) ~ (t) 0 < 0)
/* Max and min values of the integer type T, of which only the bottom
@ -443,6 +443,19 @@ int64_t time2posix_z(timezone_t, int64_t) nosideeffect;
# define UNINIT_TRAP 0
#endif
#ifdef DEBUG
# define UNREACHABLE() abort()
#elif 4 < __GNUC__ + (5 <= __GNUC_MINOR__)
# define UNREACHABLE() __builtin_unreachable()
#elif defined __has_builtin
# if __has_builtin(__builtin_unreachable)
# define UNREACHABLE() __builtin_unreachable()
# endif
#endif
#ifndef UNREACHABLE
# define UNREACHABLE() ((void) 0)
#endif
/*
** For the benefit of GNU folk...
** '_(MSGID)' uses the current locale's message library string for MSGID.
@ -510,6 +523,22 @@ char *ctime_r(int64_t const *, char *);
#define EPOCH_YEAR 1970
#define EPOCH_WDAY TM_THURSDAY
#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
/*
** Since everything in isleap is modulo 400 (or a factor of 400), we know that
** isleap(y) == isleap(y % 400)
** and so
** isleap(a + b) == isleap((a + b) % 400)
** or
** isleap(a + b) == isleap(a % 400 + b % 400)
** This is true even if % means modulo rather than Fortran remainder
** (which is allowed by C89 but not by C99 or later).
** We use this to avoid addition overflow problems.
*/
#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_THIRD_PARTY_TZ_PRIVATE_H_ */