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Diffstat (limited to 'include/grub/datetime.h')
| -rw-r--r-- | include/grub/datetime.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/include/grub/datetime.h b/include/grub/datetime.h new file mode 100644 index 0000000..23ae079 --- /dev/null +++ b/include/grub/datetime.h @@ -0,0 +1,133 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2008 Free Software Foundation, Inc. + * + * GRUB 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 3 of the License, or + * (at your option) any later version. + * + * GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef KERNEL_DATETIME_HEADER +#define KERNEL_DATETIME_HEADER 1 + +#include <grub/types.h> +#include <grub/err.h> + +struct grub_datetime +{ + grub_uint16_t year; + grub_uint8_t month; + grub_uint8_t day; + grub_uint8_t hour; + grub_uint8_t minute; + grub_uint8_t second; +}; + +/* Return date and time. */ +#ifdef GRUB_MACHINE_EMU +grub_err_t EXPORT_FUNC(grub_get_datetime) (struct grub_datetime *datetime); + +/* Set date and time. */ +grub_err_t EXPORT_FUNC(grub_set_datetime) (struct grub_datetime *datetime); +#else +grub_err_t grub_get_datetime (struct grub_datetime *datetime); + +/* Set date and time. */ +grub_err_t grub_set_datetime (struct grub_datetime *datetime); +#endif + +int grub_get_weekday (struct grub_datetime *datetime); +const char *grub_get_weekday_name (struct grub_datetime *datetime); + +void grub_unixtime2datetime (grub_int64_t nix, + struct grub_datetime *datetime); + +static inline int +grub_datetime2unixtime (const struct grub_datetime *datetime, grub_int64_t *nix) +{ + grub_int32_t ret; + int y4, ay; + const grub_uint16_t monthssum[12] + = { 0, + 31, + 31 + 28, + 31 + 28 + 31, + 31 + 28 + 31 + 30, + 31 + 28 + 31 + 30 + 31, + 31 + 28 + 31 + 30 + 31 + 30, + 31 + 28 + 31 + 30 + 31 + 30 + 31, + 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31, + 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30, + 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31, + 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30}; + const grub_uint8_t months[12] = {31, 28, 31, 30, 31, 30, + 31, 31, 30, 31, 30, 31}; + const int SECPERMIN = 60; + const int SECPERHOUR = 60 * SECPERMIN; + const int SECPERDAY = 24 * SECPERHOUR; + const int SECPERYEAR = 365 * SECPERDAY; + const int SECPER4YEARS = 4 * SECPERYEAR + SECPERDAY; + + if (datetime->year > 2038 || datetime->year < 1901) + return 0; + if (datetime->month > 12 || datetime->month < 1) + return 0; + + /* In the period of validity of unixtime all years divisible by 4 + are bissextile*/ + /* Convenience: let's have 3 consecutive non-bissextile years + at the beginning of the epoch. So count from 1973 instead of 1970 */ + ret = 3 * SECPERYEAR + SECPERDAY; + + /* Transform C divisions and modulos to mathematical ones */ + y4 = ((datetime->year - 1) >> 2) - (1973 / 4); + ay = datetime->year - 1973 - 4 * y4; + ret += y4 * SECPER4YEARS; + ret += ay * SECPERYEAR; + + ret += monthssum[datetime->month - 1] * SECPERDAY; + if (ay == 3 && datetime->month >= 3) + ret += SECPERDAY; + + ret += (datetime->day - 1) * SECPERDAY; + if ((datetime->day > months[datetime->month - 1] + && (!ay || datetime->month != 2 || datetime->day != 29)) + || datetime->day < 1) + return 0; + + ret += datetime->hour * SECPERHOUR; + if (datetime->hour > 23) + return 0; + ret += datetime->minute * 60; + if (datetime->minute > 59) + return 0; + + ret += datetime->second; + /* Accept leap seconds. */ + if (datetime->second > 60) + return 0; + + if ((datetime->year > 1980 && ret < 0) + || (datetime->year < 1960 && ret > 0)) + return 0; + *nix = ret; + return 1; +} + +#if (defined (__powerpc__) || defined (__sparc__)) && !defined (GRUB_UTIL) +grub_err_t +grub_get_datetime_cmos (struct grub_datetime *datetime); +grub_err_t +grub_set_datetime_cmos (struct grub_datetime *datetime); +#endif + +#endif /* ! KERNEL_DATETIME_HEADER */ |