change function definitions

Buffers are no longer wired into any input or translation functions.
They are supplied as arguments through main.

input.h

@@ -3,13 +3,10 @@
 
 #include <stdio.h>
 
-extern unsigned char o[];
-extern unsigned char s[];
+int
+getocts(FILE *fp, unsigned char *o, int olen);
 
-unsigned char *
-getocts(FILE *fp, int *np);
-
-unsigned char *
-getsxts(FILE *fp, int *np);
+int
+getsxts(FILE *fp, unsigned char *s, int slen);
 
 #endif