mirror of
https://github.com/jart/cosmopolitan.git
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59 lines
3.1 KiB
C
59 lines
3.1 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/bits/bits.h"
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#include "libc/time/time.h"
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#include "libc/str/str.h"
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#include "net/http/http.h"
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static unsigned ParseMonth(const char *p) {
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int i;
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for (i = 0; i < 12; ++i) {
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if ((READ32LE(p) & 0x00ffffff) == READ32LE(kMonthNameShort[i])) {
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return i + 1;
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}
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}
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return 1;
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}
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/**
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* Parses 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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* @return seconds from unix epoch
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* @param n if -1 implies strlen
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* @see FormatHttpDateTime()
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*/
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int64_t ParseHttpDateTime(const char *p, size_t n) {
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unsigned weekday, year, month, day, hour, minute, second, yday, leap;
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if (n == -1) n = p ? strlen(p) : 0;
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if (n != 29) return 0;
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day = (p[5] - '0') * 10 + (p[6] - '0') - 1;
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month = ParseMonth(p + 8);
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year = (p[12] - '0') * 1000 + (p[13] - '0') * 100 + (p[14] - '0') * 10 +
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(p[15] - '0') - 1900;
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hour = (p[17] - '0') * 10 + (p[18] - '0');
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minute = (p[20] - '0') * 10 + (p[21] - '0');
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second = (p[23] - '0') * 10 + (p[24] - '0');
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leap = year % 4 == 0 && (year % 100 || year % 400 == 0);
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yday = day + kMonthYearDay[leap][month - 1];
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return second + minute * 60 + hour * 3600 + yday * 86400 +
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(year - 70) * 31536000ull + ((year - 69) / 4) * 86400ull -
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((year - 1) / 100) * 86400ull + ((year + 299) / 400) * 86400ull;
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}
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