159 lines
3.7 KiB
C
159 lines
3.7 KiB
C
#ifndef _LINUX_TIME_H
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#define _LINUX_TIME_H
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#include <linux/types.h>
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#define _DEFUN(a,b,c) a(c)
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#define _CONST const
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#define _AND ,
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#define _REENT_ONLY
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#define SECSPERMIN 60L
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#define MINSPERHOUR 60L
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#define HOURSPERDAY 24L
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#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
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#define SECSPERDAY (SECSPERHOUR * HOURSPERDAY)
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#define DAYSPERWEEK 7
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#define MONSPERYEAR 12
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#define YEAR_BASE 1900
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#define EPOCH_YEAR 1970
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#define EPOCH_WDAY 4
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#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
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/* Used by other time functions. */
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struct tm {
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int tm_sec; /* Seconds. [0-60] (1 leap second) */
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int tm_min; /* Minutes. [0-59] */
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int tm_hour; /* Hours. [0-23] */
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int tm_mday; /* Day. [1-31] */
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int tm_mon; /* Month. [0-11] */
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int tm_year; /* Year - 1900. */
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int tm_wday; /* Day of week. [0-6] */
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int tm_yday; /* Days in year.[0-365] */
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int tm_isdst; /* DST. [-1/0/1]*/
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# ifdef __USE_BSD
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long int tm_gmtoff; /* Seconds east of UTC. */
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__const char *tm_zone; /* Timezone abbreviation. */
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# else
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long int __tm_gmtoff; /* Seconds east of UTC. */
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__const char *__tm_zone; /* Timezone abbreviation. */
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# endif
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};
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static inline char *
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_DEFUN (asctime_r, (tim_p, result),
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_CONST struct tm *tim_p _AND
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char *result)
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{
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static _CONST char day_name[7][3] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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static _CONST char mon_name[12][3] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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};
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sprintf (result, "%.3s %.3s %.2d %.2d:%.2d:%.2d %d\n",
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day_name[tim_p->tm_wday],
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mon_name[tim_p->tm_mon],
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tim_p->tm_mday, tim_p->tm_hour, tim_p->tm_min,
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tim_p->tm_sec, 1900 + tim_p->tm_year);
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return result;
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}
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static inline struct tm *
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_DEFUN (localtime_r, (tim_p, res),
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_CONST time_t * tim_p _AND
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struct tm *res)
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{
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static _CONST int mon_lengths[2][MONSPERYEAR] = {
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{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
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{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
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} ;
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static _CONST int year_lengths[2] = {
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365,
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366
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} ;
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long days, rem;
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int y;
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int yleap;
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_CONST int *ip;
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days = ((long) *tim_p) / SECSPERDAY;
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rem = ((long) *tim_p) % SECSPERDAY;
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while (rem < 0)
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{
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rem += SECSPERDAY;
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--days;
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}
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while (rem >= SECSPERDAY)
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{
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rem -= SECSPERDAY;
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++days;
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}
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/* compute hour, min, and sec */
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res->tm_hour = (int) (rem / SECSPERHOUR);
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rem %= SECSPERHOUR;
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res->tm_min = (int) (rem / SECSPERMIN);
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res->tm_sec = (int) (rem % SECSPERMIN);
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/* compute day of week */
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if ((res->tm_wday = ((EPOCH_WDAY + days) % DAYSPERWEEK)) < 0)
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res->tm_wday += DAYSPERWEEK;
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/* compute year & day of year */
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y = EPOCH_YEAR;
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if (days >= 0)
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{
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for (;;)
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{
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yleap = isleap(y);
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if (days < year_lengths[yleap])
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break;
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y++;
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days -= year_lengths[yleap];
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}
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}
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else
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{
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do
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{
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--y;
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yleap = isleap(y);
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days += year_lengths[yleap];
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} while (days < 0);
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}
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res->tm_year = y - YEAR_BASE;
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res->tm_yday = days;
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ip = mon_lengths[yleap];
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for (res->tm_mon = 0; days >= ip[res->tm_mon]; ++res->tm_mon)
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days -= ip[res->tm_mon];
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res->tm_mday = days + 1;
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/* set daylight saving time flag */
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res->tm_isdst = -1;
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return (res);
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}
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static inline char *
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_DEFUN (ctime_r, (tim_p, result),
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_CONST time_t * tim_p _AND
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char * result)
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{
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struct tm tm;
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return asctime_r (localtime_r (tim_p, &tm), result);
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}
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#endif
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