135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef KERNEL_DATETIME_HEADER
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#define KERNEL_DATETIME_HEADER 1
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#include <grub/types.h>
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#include <grub/err.h>
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struct grub_datetime
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{
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grub_uint16_t year;
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grub_uint8_t month;
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grub_uint8_t day;
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grub_uint8_t hour;
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grub_uint8_t minute;
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grub_uint8_t second;
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};
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/* Return date and time. */
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#ifdef GRUB_MACHINE_EMU
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grub_err_t EXPORT_FUNC(grub_get_datetime) (struct grub_datetime *datetime);
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/* Set date and time. */
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grub_err_t EXPORT_FUNC(grub_set_datetime) (struct grub_datetime *datetime);
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#else
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grub_err_t grub_get_datetime (struct grub_datetime *datetime);
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/* Set date and time. */
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grub_err_t grub_set_datetime (struct grub_datetime *datetime);
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#endif
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int grub_get_weekday (struct grub_datetime *datetime);
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char *grub_get_weekday_name (struct grub_datetime *datetime);
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void grub_unixtime2datetime (grub_int32_t nix,
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struct grub_datetime *datetime);
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static inline int
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grub_datetime2unixtime (const struct grub_datetime *datetime, grub_int32_t *nix)
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{
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grub_int32_t ret;
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int y4, ay;
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const grub_uint16_t monthssum[12]
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= { 0,
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31,
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31 + 28,
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31 + 28 + 31,
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31 + 28 + 31 + 30,
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31 + 28 + 31 + 30 + 31,
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31 + 28 + 31 + 30 + 31 + 30,
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31 + 28 + 31 + 30 + 31 + 30 + 31,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30};
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const grub_uint8_t months[12] = {31, 28, 31, 30, 31, 30,
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31, 31, 30, 31, 30, 31};
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const int SECPERMIN = 60;
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const int SECPERHOUR = 60 * SECPERMIN;
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const int SECPERDAY = 24 * SECPERHOUR;
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const int SECPERYEAR = 365 * SECPERDAY;
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const int SECPER4YEARS = 4 * SECPERYEAR + SECPERDAY;
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if (datetime->year > 2038 || datetime->year < 1901)
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return 0;
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if (datetime->month > 12 || datetime->month < 1)
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return 0;
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/* In the period of validity of unixtime all years divisible by 4
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are bissextile*/
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/* Convenience: let's have 3 consecutive non-bissextile years
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at the beginning of the epoch. So count from 1971 instead of 1970 */
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ret = 2 * SECPERYEAR + SECPERDAY;
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/* Transform C divisions and modulos to mathematical ones */
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y4 = (datetime->year - 1972) / 4;
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if (datetime->year < 1972)
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y4--;
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ay = datetime->year - 1972 - 4 * y4;
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ret += y4 * SECPER4YEARS;
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ret += ay * SECPERYEAR;
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ret += monthssum[datetime->month - 1] * SECPERDAY;
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if (ay == 0 && datetime->month >= 3)
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ret += SECPERDAY;
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ret += (datetime->day - 1) * SECPERDAY;
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if ((datetime->day > months[datetime->month - 1]
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&& (!ay || datetime->month != 2 || datetime->day != 29))
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|| datetime->day < 1)
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return 0;
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ret += datetime->hour * SECPERHOUR;
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if (datetime->hour > 23)
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return 0;
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ret += datetime->minute * 60;
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if (datetime->minute > 59)
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return 0;
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ret += datetime->second;
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/* Accept leap seconds. */
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if (datetime->second > 60)
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return 0;
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if ((datetime->year > 1980 && ret < 0)
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|| (datetime->year < 1960 && ret > 0))
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return 0;
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*nix = ret;
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return 1;
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}
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#if defined (__powerpc__) || defined (__sparc__)
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grub_err_t
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grub_get_datetime_cmos (struct grub_datetime *datetime);
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grub_err_t
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grub_set_datetime_cmos (struct grub_datetime *datetime);
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#endif
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#endif /* ! KERNEL_DATETIME_HEADER */
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