diff options
Diffstat (limited to 'newlib/libc/time/mktime.c')
| -rw-r--r-- | newlib/libc/time/mktime.c | 250 |
1 files changed, 0 insertions, 250 deletions
diff --git a/newlib/libc/time/mktime.c b/newlib/libc/time/mktime.c deleted file mode 100644 index f6f080d84..000000000 --- a/newlib/libc/time/mktime.c +++ /dev/null @@ -1,250 +0,0 @@ -/* - * mktime.c - * Original Author: G. Haley - * - * Converts the broken-down time, expressed as local time, in the structure - * pointed to by tim_p into a calendar time value. The original values of the - * tm_wday and tm_yday fields of the structure are ignored, and the original - * values of the other fields have no restrictions. On successful completion - * the fields of the structure are set to represent the specified calendar - * time. Returns the specified calendar time. If the calendar time can not be - * represented, returns the value (time_t) -1. - */ - -/* -FUNCTION -<<mktime>>---convert time to arithmetic representation - -INDEX - mktime - -ANSI_SYNOPSIS - #include <time.h> - time_t mktime(struct tm *<[timp]>); - -TRAD_SYNOPSIS - #include <time.h> - time_t mktime(<[timp]>) - struct tm *<[timp]>; - -DESCRIPTION -<<mktime>> assumes the time at <[timp]> is a local time, and converts -its representation from the traditional representation defined by -<<struct tm>> into a representation suitable for arithmetic. - -<<localtime>> is the inverse of <<mktime>>. - -RETURNS -If the contents of the structure at <[timp]> do not form a valid -calendar time representation, the result is <<-1>>. Otherwise, the -result is the time, converted to a <<time_t>> value. - -PORTABILITY -ANSI C requires <<mktime>>. - -<<mktime>> requires no supporting OS subroutines. -*/ - -#include <stdlib.h> -#include <time.h> -#include "local.h" - -#define _SEC_IN_MINUTE 60L -#define _SEC_IN_HOUR 3600L -#define _SEC_IN_DAY 86400L - -static _CONST int DAYS_IN_MONTH[12] = -{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; - -#define _DAYS_IN_MONTH(x) ((x == 1) ? days_in_feb : DAYS_IN_MONTH[x]) - -static _CONST int _DAYS_BEFORE_MONTH[12] = -{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334}; - -#define _ISLEAP(y) (((y) % 4) == 0 && (((y) % 100) != 0 || (((y)+1900) % 400) == 0)) -#define _DAYS_IN_YEAR(year) (_ISLEAP(year) ? 366 : 365) - -static void -validate_structure (tim_p) - struct tm *tim_p; -{ - div_t res; - int days_in_feb = 28; - - /* calculate time & date to account for out of range values */ - if (tim_p->tm_sec < 0 || tim_p->tm_sec > 59) - { - res = div (tim_p->tm_sec, 60); - tim_p->tm_min += res.quot; - if ((tim_p->tm_sec = res.rem) < 0) - { - tim_p->tm_sec += 60; - --tim_p->tm_min; - } - } - - if (tim_p->tm_min < 0 || tim_p->tm_min > 59) - { - res = div (tim_p->tm_min, 60); - tim_p->tm_hour += res.quot; - if ((tim_p->tm_min = res.rem) < 0) - { - tim_p->tm_min += 60; - --tim_p->tm_hour; - } - } - - if (tim_p->tm_hour < 0 || tim_p->tm_hour > 23) - { - res = div (tim_p->tm_hour, 24); - tim_p->tm_mday += res.quot; - if ((tim_p->tm_hour = res.rem) < 0) - { - tim_p->tm_hour += 24; - --tim_p->tm_mday; - } - } - - if (tim_p->tm_mon > 11) - { - res = div (tim_p->tm_mon, 12); - tim_p->tm_year += res.quot; - if ((tim_p->tm_mon = res.rem) < 0) - { - tim_p->tm_mon += 12; - --tim_p->tm_year; - } - } - - if (_DAYS_IN_YEAR (tim_p->tm_year) == 366) - days_in_feb = 29; - - if (tim_p->tm_mday <= 0) - { - while (tim_p->tm_mday <= 0) - { - if (--tim_p->tm_mon == -1) - { - tim_p->tm_year--; - tim_p->tm_mon = 11; - days_in_feb = - ((_DAYS_IN_YEAR (tim_p->tm_year) == 366) ? - 29 : 28); - } - tim_p->tm_mday += _DAYS_IN_MONTH (tim_p->tm_mon); - } - } - else - { - while (tim_p->tm_mday > _DAYS_IN_MONTH (tim_p->tm_mon)) - { - tim_p->tm_mday -= _DAYS_IN_MONTH (tim_p->tm_mon); - if (++tim_p->tm_mon == 12) - { - tim_p->tm_year++; - tim_p->tm_mon = 0; - days_in_feb = - ((_DAYS_IN_YEAR (tim_p->tm_year) == 366) ? - 29 : 28); - } - } - } -} - -time_t -mktime (tim_p) - struct tm *tim_p; -{ - time_t tim = 0; - long days = 0; - int year, isdst; - - /* validate structure */ - validate_structure (tim_p); - - /* compute hours, minutes, seconds */ - tim += tim_p->tm_sec + (tim_p->tm_min * _SEC_IN_MINUTE) + - (tim_p->tm_hour * _SEC_IN_HOUR); - - /* compute days in year */ - days += tim_p->tm_mday - 1; - days += _DAYS_BEFORE_MONTH[tim_p->tm_mon]; - if (tim_p->tm_mon > 1 && _DAYS_IN_YEAR (tim_p->tm_year) == 366) - days++; - - /* compute day of the year */ - tim_p->tm_yday = days; - - if (tim_p->tm_year > 10000 - || tim_p->tm_year < -10000) - { - return (time_t) -1; - } - - /* compute days in other years */ - if (tim_p->tm_year > 70) - { - for (year = 70; year < tim_p->tm_year; year++) - days += _DAYS_IN_YEAR (year); - } - else if (tim_p->tm_year < 70) - { - for (year = 69; year > tim_p->tm_year; year--) - days -= _DAYS_IN_YEAR (year); - days -= _DAYS_IN_YEAR (year); - } - - /* compute day of the week */ - if ((tim_p->tm_wday = (days + 4) % 7) < 0) - tim_p->tm_wday += 7; - - /* compute total seconds */ - tim += (days * _SEC_IN_DAY); - - isdst = tim_p->tm_isdst; - - if (_daylight) - { - int y = tim_p->tm_year + YEAR_BASE; - if (y == __tzyear || __tzcalc_limits (y)) - { - /* calculate start of dst in dst local time and - start of std in both std local time and dst local time */ - time_t startdst_dst = __tzrule[0].change - __tzrule[1].offset; - time_t startstd_dst = __tzrule[1].change - __tzrule[1].offset; - time_t startstd_std = __tzrule[1].change - __tzrule[0].offset; - /* if the time is in the overlap between dst and std local times */ - if (tim >= startstd_std && tim < startstd_dst) - ; /* we let user decide or leave as -1 */ - else - { - isdst = (__tznorth - ? (tim >= startdst_dst && tim < startstd_std) - : (tim >= startdst_dst || tim < startstd_std)); - /* if user committed and was wrong, perform correction */ - if ((isdst ^ tim_p->tm_isdst) == 1) - { - /* we either subtract or add the difference between - time zone offsets, depending on which way the user got it wrong */ - int diff = __tzrule[0].offset - __tzrule[1].offset; - if (!isdst) - diff = -diff; - tim_p->tm_sec += diff; - validate_structure (tim_p); - tim += diff; /* we also need to correct our current time calculation */ - } - } - } - } - - /* add appropriate offset to put time in gmt format */ - if (isdst == 1) - tim += __tzrule[1].offset; - else /* otherwise assume std time */ - tim += __tzrule[0].offset; - - /* reset isdst flag to what we have calculated */ - tim_p->tm_isdst = isdst; - - return tim; -} |