- unsigned long a = evalrel(st, d-1);
- int neg;
- for (;;) {
- if ((st->s[0] != '=' && st->s[0] != '!') || st->s[1] != '=')
- return a;
- neg = st->s[0] == '!';
- st->s += 2;
- a = evalrel(st, d-1) == a;
- a ^= neg;
+ unsigned long a = left, b = st->r;
+ switch (op) {
+ case 0: st->r = a||b; return 0;
+ case 1: st->r = a&&b; return 0;
+ case 2: st->r = a==b; return 0;
+ case 3: st->r = a!=b; return 0;
+ case 4: st->r = a>=b; return 0;
+ case 5: st->r = a<=b; return 0;
+ case 6: st->r = a>b; return 0;
+ case 7: st->r = a<b; return 0;
+ case 8: st->r = a+b; return 0;
+ case 9: st->r = a-b; return 0;
+ case 10: st->r = a*b; return 0;
+ case 11: if (b) {st->r = a%b; return 0;} return 1;
+ case 12: if (b) {st->r = a/b; return 0;} return 1;