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Implement proper time zone support

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Cosmopolitan now supports 104 time zones. They're embedded inside any
binary that links the localtime() function. Doing so adds about 100kb
to the binary size. This change also gets time zones working properly
on Windows for the first time. It's not needed to have /etc/localtime
exist on Windows, since we can get this information from WIN32. We're
also now updated to the latest version of Paul Eggert's TZ library.
This commit is contained in:
Justine Tunney 2024-05-04 23:05:36 -07:00
parent d5ebb1fa5b
commit b0df6c1fce
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GPG key ID: BE714B4575D6E328
627 changed files with 3052 additions and 2077 deletions
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29
examples/date.c
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@ -9,19 +9,30 @@
#endif
#include "libc/calls/calls.h"
#include "libc/calls/struct/timespec.h"
#include "libc/intrin/kprintf.h"
#include "libc/macros.internal.h"
#include "libc/nt/enum/timezoneid.h"
#include "libc/nt/struct/timezoneinformation.h"
#include "libc/nt/time.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/time/struct/tm.h"
#include "libc/thread/threads.h"
#include "libc/time.h"
/**
* @fileoverview High performance ISO-8601 timestamp formatter.
*
* The strftime() function is very slow. This goes much faster.
* Consider using something like this instead for your loggers.
*/
char *GetTimestamp(void) {
int x;
struct timespec ts;
_Thread_local static long last;
_Thread_local static char s[27];
_Thread_local static struct tm tm;
thread_local static long last;
thread_local static char s[32];
thread_local static struct tm tm;
clock_gettime(0, &ts);
if (ts.tv_sec != last) {
localtime_r(&ts.tv_sec, &tm);
@ -61,11 +72,21 @@ char *GetTimestamp(void) {
s[23] = '0' + x / 100000 % 10;
s[24] = '0' + x / 10000 % 10;
s[25] = '0' + x / 1000 % 10;
s[26] = tm.tm_gmtoff < 0 ? '-' : '+';
x = ABS(tm.tm_gmtoff) / 60 / 60;
s[27] = '0' + x / 10 % 10;
s[28] = '0' + x % 10;
x = ABS(tm.tm_gmtoff) / 60 % 60;
s[29] = '0' + x / 10 % 10;
s[30] = '0' + x % 10;
return s;
}
int main(int argc, char *argv[]) {
char buf[128], *p = buf;
// setenv("TZ", "UTC", true);
// setenv("TZ", "US/Eastern", true);
// setenv("TZ", "Asia/Kolkata", true);
p = stpcpy(p, GetTimestamp());
p = stpcpy(p, "\n");
write(1, buf, p - buf);