make new code like old code

Variable declarations at top of function,
separate from initialization.

Use == 0 instead of ! for checking pointers.

Consistent spacing around {, *, casts.

Declare 0-parameter functions as (void) not ().

Integer valued functions return -1 on failure, 0 on success.

console.c

@@ -27,15 +27,16 @@ printint(int xx, int base, int sgn)
 {
   static char digits[] = "0123456789abcdef";
   char buf[16];
-  int i = 0, neg = 0;
+  int i, neg;
   uint x;
 
-  if(sgn && xx < 0){
+  if(sgn && (neg = xx < 0)){
     neg = 1;
     x = -xx;
   } else
     x = xx;
 
+  i = 0;
   do{
     buf[i++] = digits[x % base];
   }while((x /= base) != 0);