mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-12 05:59:10 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Implement proper time zone support

Browse source 
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
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
627 changed files with 3052 additions and 2077 deletions
Download patch file Download diff file Expand all files Collapse all files

93
libc/str/iso8601.c Normal file
View file

@ -0,0 +1,93 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/time.h"
/**
* Converts timestamp to ISO-8601 formatted string.
*
* For example:
*
* char *GetZuluTime(void) {
* char *p;
* struct tm tm;
* struct timespec ts;
* static _Thread_local int64_t last;
* static _Thread_local char str[21];
* clock_gettime(0, &ts);
* if (ts.tv_sec != last) {
* gmtime_r(&ts.tv_sec, &tm);
* last = ts.tv_sec;
* stpcpy(iso8601(str, &tm), "Z");
* }
* return str;
* }
*
* Will return timestamps that look like:
*
* 2020-01-01T13:14:15Z
*
* The generated timestamp is always exactly 19 characters long. It is
* also always nul terminated too.
*
* This function defines no failure conditions. The results of passing
* timestamp values outside of the appropriate intervals is undefined.
*
* @param p is buffer with at least 20 bytes
* @param tm has valid gmtime_r() or localtime_r() output
* @return pointer to nul terminator within `p`, cf. stpcpy()
* @see iso8601us() for microsecond timestamps
* @asyncsignalsafe
*/
char *iso8601(char p[hasatleast 20], struct tm *tm) {
int x;
x = tm->tm_year + 1900;
unassert(0 <= x && x <= 9999);
*p++ = '0' + x / 1000;
*p++ = '0' + x / 100 % 10;
*p++ = '0' + x / 10 % 10;
*p++ = '0' + x % 10;
*p++ = '-';
x = tm->tm_mon + 1;
unassert(1 <= x && x <= 12);
*p++ = '0' + x / 10;
*p++ = '0' + x % 10;
*p++ = '-';
x = tm->tm_mday;
unassert(1 <= x && x <= 31);
*p++ = '0' + x / 10;
*p++ = '0' + x % 10;
*p++ = 'T';
x = tm->tm_hour;
unassert(0 <= x && x <= 23);
*p++ = '0' + x / 10;
*p++ = '0' + x % 10;
*p++ = ':';
x = tm->tm_min;
unassert(0 <= x && x <= 59);
*p++ = '0' + x / 10;
*p++ = '0' + x % 10;
*p++ = ':';
x = tm->tm_sec;
unassert(0 <= x && x <= 60);
*p++ = '0' + x / 10;
*p++ = '0' + x % 10;
*p = 0;
return p;
}