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@@ -0,0 +1,174 @@
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+#include <time.h>
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+
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+/* days per month -- nonleap! */
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+const short __spm[13] =
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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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+ (31+28+31+30+31+30+31+31+30+31+30+31),
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+ };
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+static long int timezone;
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+static const char days[] = "Sun Mon Tue Wed Thu Fri Sat ";
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+static const char months[] = "Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ";
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+
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+/* seconds per day */
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+#define SPD 24*60*60
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+
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+int __isleap(int year) {
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+ /* every fourth year is a leap year except for century years that are
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+ * not divisible by 400. */
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+/* return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); */
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+ return (!(year%4) && ((year%100) || !(year%400)));
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+}
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+
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+struct tm *gmtime_r(const time_t *timep, struct tm *r) {
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+ time_t i;
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+ register time_t work=*timep%(SPD);
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+ r->tm_sec=work%60; work/=60;
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+ r->tm_min=work%60; r->tm_hour=work/60;
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+ work=*timep/(SPD);
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+ r->tm_wday=(4+work)%7;
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+ for (i=1970; ; ++i) {
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+ register time_t k=__isleap(i)?366:365;
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+ if (work>=k)
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+ work-=k;
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+ else
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+ break;
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+ }
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+ r->tm_year=i-1900;
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+ r->tm_yday=work;
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+
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+ r->tm_mday=1;
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+ if (__isleap(i) && (work>58)) {
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+ if (work==59) r->tm_mday=2; /* 29.2. */
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+ work-=1;
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+ }
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+
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+ for (i=11; i && (__spm[i]>work); --i) ;
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+ r->tm_mon=i;
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+ r->tm_mday+=work-__spm[i];
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+ return r;
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+}
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+
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+struct tm* localtime_r(const time_t* t, struct tm* r) {
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+ time_t tmp;
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+ struct timezone tz;
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+ gettimeofday(0, &tz);
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+ timezone=tz.tz_minuteswest*60L;
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+ tmp=*t+timezone;
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+ return gmtime_r(&tmp,r);
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+}
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+
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+struct tm* localtime(const time_t* t) {
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+ static struct tm tmp;
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+ return localtime_r(t,&tmp);
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+}
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+
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+time_t timegm(struct tm *const t) {
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+ register time_t day;
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+ register time_t i;
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+ register time_t years = t->tm_year - 70;
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+
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+ if (t->tm_sec>60) { t->tm_min += t->tm_sec/60; t->tm_sec%=60; }
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+ if (t->tm_min>60) { t->tm_hour += t->tm_min/60; t->tm_min%=60; }
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+ if (t->tm_hour>60) { t->tm_mday += t->tm_hour/60; t->tm_hour%=60; }
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+ if (t->tm_mon>12) { t->tm_year += t->tm_mon/12; t->tm_mon%=12; }
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+ while (t->tm_mday>__spm[1+t->tm_mon]) {
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+ if (t->tm_mon==1 && __isleap(t->tm_year+1900)) {
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+ if (t->tm_mon==31+29) break;
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+ --t->tm_mday;
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+ }
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+ t->tm_mday-=__spm[t->tm_mon];
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+ ++t->tm_mon;
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+ if (t->tm_mon>11) { t->tm_mon=0; ++t->tm_year; }
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+ }
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+
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+ if (t->tm_year < 70)
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+ return (time_t) -1;
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+
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+ /* Days since 1970 is 365 * number of years + number of leap years since 1970 */
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+ day = years * 365 + (years + 1) / 4;
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+
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+ /* After 2100 we have to substract 3 leap years for every 400 years
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+ This is not intuitive. Most mktime implementations do not support
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+ dates after 2059, anyway, so we might leave this out for it's
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+ bloat. */
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+ if ((years -= 131) >= 0) {
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+ years /= 100;
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+ day -= (years >> 2) * 3 + 1;
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+ if ((years &= 3) == 3) years--;
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+ day -= years;
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+ }
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+
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+ day += t->tm_yday = __spm [t->tm_mon] + t->tm_mday-1 + ( __isleap (t->tm_year+1900) & (t->tm_mon > 1) );
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+
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+ /* day is now the number of days since 'Jan 1 1970' */
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+ i = 7;
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+ t->tm_wday = (day + 4) % i; /* Sunday=0, Monday=1, ..., Saturday=6 */
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+
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+ i = 24;
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+ day *= i;
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+ i = 60;
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+ return ((day + t->tm_hour) * i + t->tm_min) * i + t->tm_sec;
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+}
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+
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+time_t mktime(register struct tm* const t) {
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+ time_t x=timegm(t);
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+ struct timezone tz;
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+ gettimeofday(0, &tz);
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+ timezone=tz.tz_minuteswest*60L;
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+ x+=timezone;
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+ return x;
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+}
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+
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+static void num2str(char *c,int i) {
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+ c[0]=i/10+'0';
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+ c[1]=i%10+'0';
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+}
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+
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+char *asctime_r(const struct tm *t, char *buf) {
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+ /* "Wed Jun 30 21:49:08 1993\n" */
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+ *(int*)buf=*(int*)(days+(t->tm_wday<<2));
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+ *(int*)(buf+4)=*(int*)(months+(t->tm_mon<<2));
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+ num2str(buf+8,t->tm_mday);
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+ if (buf[8]=='0') buf[8]=' ';
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+ buf[10]=' ';
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+ num2str(buf+11,t->tm_hour);
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+ buf[13]=':';
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+ num2str(buf+14,t->tm_min);
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+ buf[16]=':';
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+ num2str(buf+17,t->tm_sec);
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+ buf[19]=' ';
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+ num2str(buf+20,(t->tm_year+1900)/100);
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+ num2str(buf+22,(t->tm_year+1900)%100);
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+ buf[24]='\n';
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+ return buf;
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+}
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+
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+char *asctime(const struct tm *timeptr) {
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+ static char buf[25];
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+ return asctime_r(timeptr,buf);
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+}
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+
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+char *ctime(const time_t *timep) {
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+ return asctime(localtime(timep));
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+}
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+
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+int gettimeofday (struct timeval *tp, void *ignore)
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+{
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+ time_t t;
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+
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+ t = time(NULL);
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+ tp->tv_sec = t;
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+ tp->tv_usec = 0;
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+ return 0;
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+}
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