ref: 682b4cec8835d109e02ab5deb1c4934984fc9eb6
dir: /5551e.c/
#include <stdbool.h>
#include <stdio.h>
#define MMAX ( 1 << 8 )
unsigned int reg[8];
typedef struct
{
bool carry, overflow, nsign, sub, parity;
bool mode; /* 0 bool, 1 int */
}flag_t;
enum
{
/* logical num */
NOT = 1,
AND,
XOR,
ADD,
RST, /* reset the machine state */
CPY, /* copy stuff from a reg or addr to another */
SET,
OUT,
};
bool add_bit(bool a, bool b, bool cin, bool *cout)
{
bool out, temp;
temp = a & b;
out = ((a ^ b) | (temp & cin));
temp = a ^ b;
cout = ((a & b) | (temp & cin));
return temp;
}
void main()
{
flag_t flags;
char string[16];
unsigned int memory[MMAX], op, a, b, def = 0;
memory[0] = 0;
memory[MMAX-1] = -1;
while(scanf("%u %[^\n]", &op, string))
{
sscanf(string, "%u %u", &a, &b);
switch(op)
{
case NOT:
reg[def] = !a;
break;
case AND:
reg[def] = a & b;
break;
case XOR:
reg[def] = a ^ b;
break;
case ADD:
reg[def] = add_bit(a, b, 0, &flags.carry);
break;
case RST:
// reset():
break;
case CPY:
reg[b] = reg[a];
break;
case SET:
if((a < 0) || (a > 8))
{
fprintf(stderr, "out of regs\n");
return;
}
def = a;
break;
case OUT:
printf("%u\n", reg[a]);
break;
default:
fprintf(stderr, "unkown op\n");
return;
}
/* clear them */
a = NULL, b = NULL, op = NULL;
string = "\0";
}
}