static ptr eval(ptr x) {
if (Spairp(x)) {
switch (Schar_value(Scar(x))) {
case '+': return S_add(First(x), Second(x));
case '-': return S_sub(First(x), Second(x));
case '*': return S_mul(First(x), Second(x));
case '/': return S_div(First(x), Second(x));
case 'q': return S_trunc(First(x), Second(x));
case 'r': return S_rem(First(x), Second(x));
case 'g': return S_gcd(First(x), Second(x));
case '=': {
ptr x1 = First(x), x2 = Second(x);
if (Sfixnump(x1) && Sfixnump(x2))
return Sboolean(x1 == x2);
else if (Sbignump(x1) && Sbignump(x2))
return Sboolean(S_big_eq(x1, x2));
else return Sfalse;
}
case '<': {
ptr x1 = First(x), x2 = Second(x);
if (Sfixnump(x1))
if (Sfixnump(x2))
return Sboolean(x1 < x2);
else
return Sboolean(!BIGSIGN(x2));
else
if (Sfixnump(x2))
return Sboolean(BIGSIGN(x1));
else
return Sboolean(S_big_lt(x1, x2));
}
case 'f': return Sflonum(S_floatify(First(x)));
case 'c':
S_gc(get_thread_context(), UNFIX(First(x)),UNFIX(Second(x)));
return Svoid;
case 'd': return S_decode_float(Sflonum_value(First(x)));
default:
S_prin1(x);
putchar('\n');
printf("unrecognized operator, returning zero\n");
return FIX(0);
}
} else
return x;
}
void query_type(ptr x) {
printf("Object is a: ");
if (Sinexactnump(x)) printf("inexact ");
if (Sexactnump(x)) printf("exact ");
if (Sfixnump(x)) printf("fixnum ");
if (Scharp(x)) printf("char ");
if (Snullp(x)) printf("nil ");
if (Seof_objectp(x)) printf("eof ");
if (Sbwp_objectp(x)) printf("bwp ");
if (Sbooleanp(x)) printf("bool ");
if (Spairp(x)) printf("pair ");
if (Ssymbolp(x)) printf("symbol ");
if (Sprocedurep(x)) printf("procedure ");
if (Sflonump(x)) printf("flonum ");
if (Svectorp(x)) printf("vector ");
if (Sstringp(x)) printf("string ");
if (Sbignump(x)) printf("bignum ");
if (Sboxp(x)) printf("box ");
if (Sratnump(x)) printf("rational ");
if (Sinputportp(x)) printf("inputport ");
if (Soutputportp(x)) printf("outputport ");
if (Srecordp(x)) printf("record ");
printf("\n");
}
