5 static uint8_t frombcd(uint8_t v)
13 uint32_t posix_time(void)
15 /* Days from March 1 for a specific month, starting in March */
16 static const unsigned int yday[12] =
17 { 0, 31, 61, 92, 122, 153, 184, 214, 245, 275, 306, 337 };
18 com32sys_t ir, d0, d1, t0;
19 unsigned int c, y, mo, d, h, m, s;
22 memset(&ir, 0, sizeof ir);
25 __intcall(0x1A, &ir, &d0);
28 __intcall(0x1A, &ir, &t0);
31 __intcall(0x1A, &ir, &d1);
33 if (t0.ecx.b[1] < 0x12)
36 c = frombcd(d0.ecx.b[1]);
37 y = frombcd(d0.ecx.b[0]);
38 mo = frombcd(d0.edx.b[1]);
39 d = frombcd(d0.edx.b[0]);
41 h = frombcd(t0.ecx.b[1]);
42 m = frombcd(t0.ecx.b[0]);
43 s = frombcd(t0.edx.b[1]);
45 /* We of course have no idea about the timezone, so ignore it */
48 * Look for impossible dates... this code was written in 2010, so
49 * assume any century less than 20 is just broken.
55 /* Consider Jan and Feb as the last months of the previous year */
62 * Just in case: if the month is nonsense, don't read off the end
68 t = y*365 + y/4 - y/100 + y/400 + yday[mo-3] + d - 719469;