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#if 0
#include <time.h>
/* This is a translation from ALGOL in Collected Algorithms of CACM. */
/* Copied from Algorithm 199, Author: Robert G. Tantzen */
void __tm_conv(tmbuf, timep, offset)
struct tm *tmbuf;
time_t *timep;
time_t offset;
{
static int moffset[] =
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
long s;
long j, d, m, y;
offset += *timep;
tmbuf->tm_isdst = 0; /* Someone else can set this */
j = offset / 86400L + 719469;
s = offset % 86400L;
if (s < 0) {
s += 86400L;
j--;
}
tmbuf->tm_sec = s % 60;
tmbuf->tm_min = (s / 60) % 60;
tmbuf->tm_hour = s / 3600;
tmbuf->tm_wday = (j + 2) % 7;
/*
* Julian date converter. Takes a julian date (the number of days since
* some distant epoch or other), and fills tmbuf.
*/
y = (4L * j - 1L) / 146097L;
j = 4L * j - 1L - 146097L * y;
d = j / 4L;
j = (4L * d + 3L) / 1461L;
d = 4L * d + 3L - 1461L * j;
d = (d + 4L) / 4L;
m = (5L * d - 3L) / 153L;
d = 5L * d - 3 - 153L * m;
d = (d + 5L) / 5L;
y = 100L * y + j;
if (m < 10)
m += 2;
else {
m -= 10;
++y;
}
tmbuf->tm_year = y - 1900;
tmbuf->tm_mon = m;
tmbuf->tm_mday = d;
tmbuf->tm_yday = d + moffset[m];
if (m > 1 && ((y) % 4 == 0 && ((y) % 100 != 0 || (y) % 400 == 0)))
tmbuf->tm_yday++;
}
#else
/* This is adapted from glibc */
/* Copyright (C) 1991, 1993 Free Software Foundation, Inc */
#define SECS_PER_HOUR 3600L
#define SECS_PER_DAY 86400L
#include <time.h>
static const unsigned short int __mon_lengths[2][12] = {
/* Normal years. */
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
/* Leap years. */
{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
};
void __tm_conv(tmbuf, t, offset)
struct tm *tmbuf;
time_t *t;
time_t offset;
{
long days, rem;
register int y;
register const unsigned short int *ip;
timezone = -offset;
days = *t / SECS_PER_DAY;
rem = *t % SECS_PER_DAY;
rem += offset;
while (rem < 0) {
rem += SECS_PER_DAY;
--days;
}
while (rem >= SECS_PER_DAY) {
rem -= SECS_PER_DAY;
++days;
}
tmbuf->tm_hour = rem / SECS_PER_HOUR;
rem %= SECS_PER_HOUR;
tmbuf->tm_min = rem / 60;
tmbuf->tm_sec = rem % 60;
/* January 1, 1970 was a Thursday. */
tmbuf->tm_wday = (4 + days) % 7;
if (tmbuf->tm_wday < 0)
tmbuf->tm_wday += 7;
y = 1970;
while (days >= (rem = __isleap(y) ? 366 : 365)) {
++y;
days -= rem;
}
while (days < 0) {
--y;
days += __isleap(y) ? 366 : 365;
}
tmbuf->tm_year = y - 1900;
tmbuf->tm_yday = days;
ip = __mon_lengths[__isleap(y)];
for (y = 0; days >= ip[y]; ++y)
days -= ip[y];
tmbuf->tm_mon = y;
tmbuf->tm_mday = days + 1;
tmbuf->tm_isdst = -1;
}
#endif
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