1 /*- 2 * Copyright (c) 1979 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)NIL.c 1.5 (Berkeley) 04/09/90"; 10 #endif /* not lint */ 11 12 #include "h00vars.h" 13 14 char ENIL[] = "Pointer value out of legal range\n"; 15 16 char * 17 NIL(ptr) 18 char *ptr; /* pointer to struct */ 19 { 20 if (ptr > _maxptr || ptr < _minptr) { 21 ERROR(ENIL, 0); 22 } 23 return ptr; 24 } 25