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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
94 lines
3.7 KiB
C
94 lines
3.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 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 *GetZuluTime(void) {
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* char *p;
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* struct tm tm;
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* struct timespec ts;
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* static _Thread_local int64_t last;
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* static _Thread_local char str[21];
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* clock_gettime(0, &ts);
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* if (ts.tv_sec != last) {
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* gmtime_r(&ts.tv_sec, &tm);
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* last = ts.tv_sec;
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* stpcpy(iso8601(str, &tm), "Z");
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* }
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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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* 2020-01-01T13:14:15Z
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*
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* The generated timestamp is always exactly 19 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 values outside of the appropriate intervals is undefined.
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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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* @return pointer to nul terminator within `p`, cf. stpcpy()
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* @see iso8601us() for microsecond timestamps
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* @asyncsignalsafe
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*/
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char *iso8601(char p[hasatleast 20], struct tm *tm) {
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int x;
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x = tm->tm_year + 1900;
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unassert(0 <= x && x <= 9999);
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*p++ = '0' + x / 1000;
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*p++ = '0' + x / 100 % 10;
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*p++ = '0' + x / 10 % 10;
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*p++ = '0' + x % 10;
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*p++ = '-';
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x = tm->tm_mon + 1;
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unassert(1 <= x && x <= 12);
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*p++ = '0' + x / 10;
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*p++ = '0' + x % 10;
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*p++ = '-';
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x = tm->tm_mday;
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unassert(1 <= x && x <= 31);
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*p++ = '0' + x / 10;
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*p++ = '0' + x % 10;
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*p++ = 'T';
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x = tm->tm_hour;
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unassert(0 <= x && x <= 23);
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*p++ = '0' + x / 10;
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*p++ = '0' + x % 10;
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*p++ = ':';
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x = tm->tm_min;
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unassert(0 <= x && x <= 59);
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*p++ = '0' + x / 10;
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*p++ = '0' + x % 10;
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*p++ = ':';
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x = tm->tm_sec;
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unassert(0 <= x && x <= 60);
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*p++ = '0' + x / 10;
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*p++ = '0' + x % 10;
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*p = 0;
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return p;
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}
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