diff options
Diffstat (limited to 'extras/mini-os/arch')
| -rw-r--r-- | extras/mini-os/arch/ia64/time.c | 96 |
1 files changed, 54 insertions, 42 deletions
diff --git a/extras/mini-os/arch/ia64/time.c b/extras/mini-os/arch/ia64/time.c index 6da27fb4d7..95e1ce4efe 100644 --- a/extras/mini-os/arch/ia64/time.c +++ b/extras/mini-os/arch/ia64/time.c @@ -1,26 +1,9 @@ /* * Done by Dietmar Hahn <dietmar.hahn@fujitsu-siemens.com> * Description: simple ia64 specific time handling - * mktime() is taken from Linux (see copyright below) * Parts are taken from FreeBSD. * **************************************************************************** - * For the copy of the mktime() from linux. - * 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 - * (at your option) 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - **************************************************************************** * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -57,6 +40,49 @@ static uint64_t itc_frequency; static uint64_t processor_frequency; static uint64_t itm_val; +static int is_leap_year(int year) +{ + if( year % 4 == 0 ) + { + if( year % 100 == 0 ) + { + if( year % 400 == 0 ) return 1; + else return 0; + } + return 1; + } + return 0; +} + +static int count_leap_years(int epoch, int year) +{ + int i, result = 0; + for( i = epoch ; i < year ; i++ ) if( is_leap_year(i) ) result++; + return result; +} + +static int get_day(int year, int mon, int day) { + int result; + switch(mon) + { + case 0: result = 0; break; + case 1: result = 31; break; /* 1: 31 */ + case 2: result = 59; break; /* 2: 31+28 */ + case 3: result = 90; break; /* 3: 59+31 */ + case 4: result = 120;break; /* 4: 90+30 */ + case 5: result = 151;break; /* 5: 120+31 */ + case 6: result = 181;break; /* 6: 151+30 */ + case 7: result = 212;break; /* 7: 181+31 */ + case 8: result = 243;break; /* 8: 212+31 */ + case 9: result = 273;break; /* 9: 243+30 */ + case 10:result = 304;break; /* 10:273+31 */ + case 11:result = 334;break; /* 11:304+30 */ + default: break; + } + if( is_leap_year(year) && mon > 2 ) result++; + result += day - 1; + return result; +} /* * mktime() is take from Linux. See copyright above. @@ -64,38 +90,24 @@ static uint64_t itm_val; * Assumes input in normal date format, i.e. 1980-12-31 23:59:59 * => year=1980, mon=12, day=31, hour=23, min=59, sec=59. * - * [For the Julian calendar (which was used in Russia before 1917, - * Britain & colonies before 1752, anywhere else before 1582, - * and is still in use by some communities) leave out the - * -year/100+year/400 terms, and add 10.] - * - * This algorithm was first published by Gauss (I think). - * * WARNING: this function will overflow on 2106-02-07 06:28:16 on * machines were long is 32-bit! (However, as time_t is signed, we * will already get problems at other places on 2038-01-19 03:14:08) */ -static unsigned long -_mktime(const unsigned int year0, const unsigned int mon0, - const unsigned int day, const unsigned int hour, - const unsigned int min, const unsigned int sec) +static unsigned long _mktime(const unsigned int year, const unsigned int mon, + const unsigned int day, const unsigned int hour, + const unsigned int min, const unsigned int sec) { - unsigned int mon = mon0, year = year0; + unsigned long result = 0; - /* 1..12 -> 11,12,1..10 */ - if (0 >= (int) (mon -= 2)) { - mon += 12; /* Puts Feb last since it has leap day */ - year -= 1; - } + result = sec; + result += min * 60; + result += hour * 3600; + result += get_day(year, mon - 1, day) * 86400; + result += (year - 1970) * 31536000; + result += count_leap_years(1970, year) * 86400; - return ( - ( - ((unsigned long) - (year/4 - year/100 + year/400 + 367*mon/12 + day) + - year*365 - 719499 - ) * 24 + hour /* now have hours */ - ) * 60 + min /* now have minutes */ - ) * 60 + sec; /* finally seconds */ + return result; } static inline uint64_t |