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#include <com32.h>
#include <string.h>
#include "ctime.h"
static uint8_t frombcd(uint8_t v)
{
uint8_t a = v & 0x0f;
uint8_t b = v >> 4;
return a + b*10;
}
uint32_t posix_time(void)
{
/* Days from March 1 for a specific month, starting in March */
static const unsigned int yday[12] =
{ 0, 31, 61, 92, 122, 153, 184, 214, 245, 275, 306, 337 };
com32sys_t ir, d0, d1, t0;
unsigned int c, y, mo, d, h, m, s;
uint32_t t;
memset(&ir, 0, sizeof ir);
ir.eax.b[1] = 0x04;
__intcall(0x1A, &ir, &d0);
ir.eax.b[1] = 0x02;
__intcall(0x1A, &ir, &t0);
ir.eax.b[1] = 0x04;
__intcall(0x1A, &ir, &d1);
if (t0.ecx.b[1] < 0x12)
d0 = d1;
c = frombcd(d0.ecx.b[1]);
y = frombcd(d0.ecx.b[0]);
mo = frombcd(d0.edx.b[1]);
d = frombcd(d0.edx.b[0]);
h = frombcd(t0.ecx.b[1]);
m = frombcd(t0.ecx.b[0]);
s = frombcd(t0.edx.b[1]);
/* We of course have no idea about the timezone, so ignore it */
/*
* Look for impossible dates... this code was written in 2010, so
* assume any century less than 20 is just broken.
*/
if (c < 20)
c = 20;
y += c*100;
/* Consider Jan and Feb as the last months of the previous year */
if (mo < 3) {
y--;
mo += 12;
}
/*
* Just in case: if the month is nonsense, don't read off the end
* of the table...
*/
if (mo-3 > 11)
return 0;
t = y*365 + y/4 - y/100 + y/400 + yday[mo-3] + d - 719469;
t *= 24;
t += h;
t *= 60;
t += m;
t *= 60;
t += s;
return t;
}
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