1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
#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++;
}
|
