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Diffstat (limited to 'qemu/roms/ipxe/src/core/time.c')
| -rw-r--r-- | qemu/roms/ipxe/src/core/time.c | 142 |
1 files changed, 0 insertions, 142 deletions
diff --git a/qemu/roms/ipxe/src/core/time.c b/qemu/roms/ipxe/src/core/time.c deleted file mode 100644 index 29a924ebe..000000000 --- a/qemu/roms/ipxe/src/core/time.c +++ /dev/null @@ -1,142 +0,0 @@ -/* - * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>. - * - * 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; either version 2 of the - * License, or any later version. - * - * 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. - * - * You can also choose to distribute this program under the terms of - * the Unmodified Binary Distribution Licence (as given in the file - * COPYING.UBDL), provided that you have satisfied its requirements. - */ - -FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); - -#include <time.h> - -/** @file - * - * Date and time - * - * POSIX:2008 section 4.15 defines "seconds since the Epoch" as an - * abstract measure approximating the number of seconds that have - * elapsed since the Epoch, excluding leap seconds. The formula given - * is - * - * tm_sec + tm_min*60 + tm_hour*3600 + tm_yday*86400 + - * (tm_year-70)*31536000 + ((tm_year-69)/4)*86400 - - * ((tm_year-1)/100)*86400 + ((tm_year+299)/400)*86400 - * - * This calculation assumes that leap years occur in each year that is - * either divisible by 4 but not divisible by 100, or is divisible by - * 400. - */ - -/** Days of week (for debugging) */ -static const char *weekdays[] = { - "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" -}; - -/** - * Determine whether or not year is a leap year - * - * @v tm_year Years since 1900 - * @v is_leap_year Year is a leap year - */ -static int is_leap_year ( int tm_year ) { - int leap_year = 0; - - if ( ( tm_year % 4 ) == 0 ) - leap_year = 1; - if ( ( tm_year % 100 ) == 0 ) - leap_year = 0; - if ( ( tm_year % 400 ) == 100 ) - leap_year = 1; - - return leap_year; -} - -/** - * Calculate number of leap years since 1900 - * - * @v tm_year Years since 1900 - * @v num_leap_years Number of leap years - */ -static int leap_years_to_end ( int tm_year ) { - int leap_years = 0; - - leap_years += ( tm_year / 4 ); - leap_years -= ( tm_year / 100 ); - leap_years += ( ( tm_year + 300 ) / 400 ); - - return leap_years; -} - -/** - * Calculate day of week - * - * @v tm_year Years since 1900 - * @v tm_mon Month of year [0,11] - * @v tm_day Day of month [1,31] - */ -static int day_of_week ( int tm_year, int tm_mon, int tm_mday ) { - static const uint8_t offset[12] = - { 1, 4, 3, 6, 1, 4, 6, 2, 5, 0, 3, 5 }; - int pseudo_year = tm_year; - - if ( tm_mon < 2 ) - pseudo_year--; - return ( ( pseudo_year + leap_years_to_end ( pseudo_year ) + - offset[tm_mon] + tm_mday ) % 7 ); -} - -/** Days from start of year until start of months (in non-leap years) */ -static const uint16_t days_to_month_start[] = - { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 }; - -/** - * Calculate seconds since the Epoch - * - * @v tm Broken-down time - * @ret time Seconds since the Epoch - */ -time_t mktime ( struct tm *tm ) { - int days_since_epoch; - int seconds_since_day; - time_t seconds; - - /* Calculate day of year */ - tm->tm_yday = ( ( tm->tm_mday - 1 ) + - days_to_month_start[ tm->tm_mon ] ); - if ( ( tm->tm_mon >= 2 ) && is_leap_year ( tm->tm_year ) ) - tm->tm_yday++; - - /* Calculate day of week */ - tm->tm_wday = day_of_week ( tm->tm_year, tm->tm_mon, tm->tm_mday ); - - /* Calculate seconds since the Epoch */ - days_since_epoch = ( tm->tm_yday + ( 365 * tm->tm_year ) - 25567 + - leap_years_to_end ( tm->tm_year - 1 ) ); - seconds_since_day = - ( ( ( ( tm->tm_hour * 60 ) + tm->tm_min ) * 60 ) + tm->tm_sec ); - seconds = ( ( ( ( time_t ) days_since_epoch ) * ( ( time_t ) 86400 ) ) + - seconds_since_day ); - - DBGC ( &weekdays, "TIME %04d-%02d-%02d %02d:%02d:%02d => %lld (%s, " - "day %d)\n", ( tm->tm_year + 1900 ), ( tm->tm_mon + 1 ), - tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec, seconds, - weekdays[ tm->tm_wday ], tm->tm_yday ); - - return seconds; -} |