1 /* Copyright (c) 1979 Regents of the University of California */ 2 3 static char sccsid[] = "@(#)NIL.c 1.4 01/09/89"; 4 5 #include "h00vars.h" 6 7 char ENIL[] = "Pointer value out of legal range\n"; 8 9 char * 10 NIL(ptr) 11 char *ptr; /* pointer to struct */ 12 { 13 if (ptr > _maxptr || ptr < _minptr) { 14 ERROR(ENIL, 0); 15 } 16 return ptr; 17 } 18