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Use 64-bit years

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This change makes strftime() go faster and makes it possible to format
timestamps through the big bang to most of the stelliferous era. India
has also been added as a timezone to most binaries. Since we were able
to change the struct tm abi, this makes cosmopolitan libc superior, to
just about everything else, when it comes to standing the test of time
This commit is contained in:
Justine Tunney 2022-05-11 17:48:50 -07:00
parent 2aebda7718
commit cfc3a953ae
13 changed files with 542 additions and 482 deletions
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31
libc/time/tz.internal.h
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@ -5,6 +5,7 @@
#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)
@ -377,7 +378,6 @@ 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
@ -443,19 +443,6 @@ 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.
@ -523,22 +510,6 @@ 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_ */