static int
vidc_ischar(void)
{
v86.ctl = V86_FLAGS;
v86.addr = 0x16;
v86.eax = 0x100;
v86int();
return (!V86_ZR(v86.efl));
}
int
getc(int fn)
{
/*
* The extra comparison against zero is an attempt to work around
* what appears to be a bug in QEMU and Bochs. Both emulators
* sometimes report a key-press with scancode one and ascii zero
* when no such key is pressed in reality. As far as I can tell,
* this only happens shortly after a reboot.
*/
v86.ctl = V86_FLAGS;
v86.addr = 0x16;
v86.eax = fn << 8;
v86int();
return fn == 0 ? v86.eax & 0xff : (!V86_ZR(v86.efl) && (v86.eax & 0xff));
}
