mirror of
https://github.com/jart/cosmopolitan.git
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77 lines
3.2 KiB
C
77 lines
3.2 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 2020 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/macros.internal.h"
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#include "libc/str/str.h"
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#include "libc/time/struct/tm.h"
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#include "libc/time/time.h"
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#include "net/http/http.h"
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/**
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* Formats HTTP timestamp, e.g.
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*
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* Sun, 04 Oct 2020 19:50:10 GMT
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*
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* This function is the same as:
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*
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* strftime(p, 30, "%a, %d %b %Y %H:%M:%S %Z", tm)
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*
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* Except this function goes 10x faster:
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*
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* FormatHttpDateTime l: 25𝑐 8𝑛𝑠
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* strftime l: 709𝑐 229𝑛𝑠
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*
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* @param tm must be zulu see gmtime_r() and nowl()
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* @see ParseHttpDateTime()
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*/
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char *FormatHttpDateTime(char p[hasatleast 30], struct tm *tm) {
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unsigned i;
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p = mempcpy(p, kWeekdayNameShort[tm->tm_wday], 3);
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*p++ = ',';
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*p++ = ' ';
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i = MIN(MAX(tm->tm_mday, 1), 31);
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*p++ = '0' + i / 10;
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*p++ = '0' + i % 10;
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*p++ = ' ';
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i = MIN(MAX(tm->tm_mon, 0), 11);
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p = mempcpy(p, kMonthNameShort[i], 3);
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*p++ = ' ';
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i = MIN(MAX(tm->tm_year + 1900, 0), 9999);
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*p++ = '0' + i / 1000;
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*p++ = '0' + i / 100 % 10;
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*p++ = '0' + i / 10 % 10;
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*p++ = '0' + i % 10;
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*p++ = ' ';
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i = MIN(MAX(tm->tm_hour, 0), 23);
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*p++ = '0' + i / 10;
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*p++ = '0' + i % 10;
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*p++ = ':';
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i = MIN(MAX(tm->tm_min, 0), 59);
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*p++ = '0' + i / 10;
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*p++ = '0' + i % 10;
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*p++ = ':';
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i = MIN(MAX(tm->tm_sec, 0), 59);
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*p++ = '0' + i / 10;
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*p++ = '0' + i % 10;
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*p++ = ' ';
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*p++ = 'G';
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*p++ = 'M';
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*p++ = 'T';
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*p = '\0';
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return p;
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}
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