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Fold conv package into fmt

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Both packages had nearly identical dependency requirements, so merging
them should help reduce the complexity of the build graph.
This commit is contained in:
Justine Tunney 2020-12-09 15:04:54 -08:00
parent 978b7858f9
commit 1fc91f3580
203 changed files with 352 additions and 563 deletions
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43
libc/fmt/dosdatetimetounix.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/fmt/conv.h"
#include "libc/macros.h"
#include "libc/time/time.h"
/**
* Converts MS-DOS timestamp to UNIX.
*
* @note type signature supports dates greater than 2100
* @see PKZIP, FAT
*/
int64_t DosDateTimeToUnix(unsigned date, unsigned time) {
unsigned weekday, year, month, day, hour, minute, second, yday, leap;
year = ((date & 0xfffffe00) >> 9) + 1980 - 1900;
month = MAX(1, MIN(12, (date & 0x01e0) >> 5));
day = (date & 0x001f) ? (date & 0x001f) - 1 : 0;
hour = (time & 0x0000f800) >> 11;
minute = (time & 0x000007e0) >> 5;
second = (time & 0x0000001f) << 1;
leap = year % 4 == 0 && (year % 100 || year % 400 == 0);
yday = day + kMonthYearDay[leap][month - 1];
return second + minute * 60 + hour * 3600 + yday * 86400 +
(year - 70) * 31536000ull + ((year - 69) / 4) * 86400ull -
((year - 1) / 100) * 86400ull + ((year + 299) / 400) * 86400ull;
}