mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
7e0a09feec
This change ports APE Loader to Linux AARCH64, so that Raspberry Pi users can run programs like redbean, without the executable needing to modify itself. Progress has also slipped into this change on the issue of making progress better conforming to user expectations and industry standards regarding which symbols we're allowed to declare
79 lines
3.6 KiB
C
79 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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