🚀 go-pugleaf

From James M. Turner:
    
    here's a cute bug in megamax C:
    
    int c;
    
	while((c = getchar()) != EOF) {
    .
    .
    .
	}
    
    works fine but:
    
    unsigned char c;
    
	while((c = getchar()) != EOF) {
    .
    .
    .
	}
    
    loops infinately, the problem is that megamax generates the
    following code:
    
	AND     #0xff,D0        ;D0 has the result of getchar
	CMP     #-1,D0          ;ooppsss should be CMP.B
    
As well it should!  EOF is -1.  An "unsigned" number is always
positive and hence can never equal a negative number.  The reason
c must be an int and not a char is that getchar() might return any
any of 256 valid bytes as well as the EOF indicator -- 257 values
in all, and they won't fit into 8 bits.

--Mike Fischer <fischer@yale.arpa>

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