1 /* Copyright (c) 1979 Regents of the University of California */ 2 3 static char sccsid[] = "@(#)NIL.c 1.2 06/10/81"; 4 5 #include "h00vars.h" 6 7 char * 8 NIL(ptr) 9 10 char *ptr; /* pointer to struct */ 11 { 12 if (ptr > _maxptr || ptr < _minptr) { 13 ERROR("Pointer value out of legal range\n", 0); 14 return; 15 } 16 return ptr; 17 } 18