1 /* Copyright (c) 1979 Regents of the University of California */ 2 3 static char sccsid[] = "@(#)NIL.c 1.1 10/30/80"; 4 5 #include "h00vars.h" 6 #include "h01errs.h" 7 8 char * 9 NIL(ptr) 10 11 char *ptr; /* pointer to struct */ 12 { 13 if (ptr > _maxptr || ptr < _minptr) { 14 ERROR(ENILPTR, 0); 15 return; 16 } 17 return ptr; 18 } 19