mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-08 14:42:40 +00:00
b407327972
- clock_nanosleep() is now much faster on OpenBSD and NetBSD - Thread joining is now much faster on NetBSD - FreeBSD timestamps are now more accurate - Thread spawning now goes faster on XNU - Clean up the clone() code
80 lines
3.6 KiB
C
80 lines
3.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/time/struct/tm.h"
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#include "libc/time/time.h"
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/**
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* Converts timestamp to ISO-8601 formatted string.
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*
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* For example:
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*
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* char *GetTimestamp(void) {
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* struct timespec ts;
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* static _Thread_local struct tm tm;
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* static _Thread_local int64_t last;
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* static _Thread_local char str[27];
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* clock_gettime(0, &ts);
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* if (ts.tv_sec != last) {
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* localtime_r(&ts.tv_sec, &tm);
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* last = ts.tv_sec;
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* }
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* iso8601us(str, &tm, ts.tv_nsec);
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* return str;
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* }
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*
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* Will return timestamps that look like:
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*
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* 2020-01-01T13:14:15.123456
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*
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* The generated timestamp is always exactly 26 characters long. It is
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* also always nul terminated too.
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*
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* This function defines no failure conditions. The results of passing
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* timestamp, or nanosecond values outside their appropriate intervals
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* is undefined.
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*
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* This goes 19x faster than strftime().
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*
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* iso8601 l: 21c 7ns
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* iso8601us l: 39c 13ns
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* strftime l: 779c 252ns
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*
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* @param p is buffer with at least 20 bytes
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* @param tm has valid gmtime_r() or localtime_r() output
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* @param ns is nanosecond value associated with timestamp
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* @return pointer to nul terminator within `p`, cf. stpcpy()
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* @see iso8601() if microsecond resolution isn't desirable
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* @asyncsignalsafe
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* @threadsafe
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*/
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char *iso8601us(char p[hasatleast 27], struct tm *tm, long ns) {
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p = iso8601(p, tm);
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_unassert(0 <= ns && ns < 1000000000);
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*p++ = '.';
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*p++ = '0' + ns / 100000000;
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*p++ = '0' + ns / 10000000 % 10;
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*p++ = '0' + ns / 1000000 % 10;
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*p++ = '0' + ns / 100000 % 10;
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*p++ = '0' + ns / 10000 % 10;
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*p++ = '0' + ns / 1000 % 10;
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*p = 0;
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return p;
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}
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