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ape: fix mktime() again

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This commit is contained in:
cinap_lenrek 2015-08-04 02:00:37 +02:00
parent 402741bc01
commit 333812ca38
1 changed files with 39 additions and 29 deletions
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68
sys/src/ape/lib/ap/gen/mktime.c
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@ -1,3 +1,4 @@
#define _REENTRANT_SOURCE
#include <time.h>
/*
@ -62,12 +63,34 @@ jan1(int yr)
return d;
}
static time_t
tm2sec(struct tm *t)
{
time_t a;
int i;
a = t->tm_sec;
a += 60 * t->tm_min;
a += 3600 * t->tm_hour;
a += 86400L * t->tm_yday;
if(t->tm_year < 70){
for(i=t->tm_year; i<70; i++)
if((a -= dysize(i)*86400L) < 0)
return -1;
}else if(t->tm_year > 70){
for(i=70; i<t->tm_year; i++)
if((a += dysize(i)*86400L) < 0)
return -1;
}
return a;
}
time_t
mktime(struct tm *t)
{
time_t a;
int i, d;
struct tm *ptm;
int i;
time_t a, b;
struct tm tt;
if(!(reduce(&t->tm_sec, &t->tm_min, 60) &&
reduce(&t->tm_min, &t->tm_hour, 60) &&
@ -88,35 +111,22 @@ mktime(struct tm *t)
t->tm_year++;
}
}
a = t->tm_sec + 60*t->tm_min + 3600*t->tm_hour;
t->tm_yday = t->tm_mday-1;
for(i=0; i<t->tm_mon; i++)
t->tm_yday += dmsize(i, t->tm_year);
a += t->tm_yday*86400L;
if(t->tm_year < 70){
for(i=t->tm_year; i<70; i++)
if((a -= dysize(i)*86400L) < 0)
return -1;
}else if(t->tm_year > 70){
for(i=70; i<t->tm_year; i++)
if((a += dysize(i)*86400L) < 0)
return -1;
}
/*
* Now a is number of seconds past Jan 1 1970.
* Convert to GMT.
*/
ptm = gmtime(&a);
d = ptm->tm_hour;
ptm = localtime(&a);
d -= ptm->tm_hour;
// if(d < 0)
// d += 24;
if(t->tm_isdst == 0 && ptm->tm_isdst)
d--;
if(t->tm_isdst > 0 && !ptm->tm_isdst)
d++;
a += d*3600;
t->tm_wday = (jan1(t->tm_year)+t->tm_yday)%7;
if((a = tm2sec(t)) != -1){
b = a;
localtime_r(&a, &tt);
a += (b - tm2sec(&tt));
if(t->tm_isdst < 0){
localtime_r(&a, &tt);
a += (b - tm2sec(&tt));
}
else if(!t->tm_isdst && tt.tm_isdst)
a += 3600;
else if(t->tm_isdst && !tt.tm_isdst)
a -= 3600;
}
return a;
}