1*1668Smckusick /* Copyright (c) 1979 Regents of the University of California */ 2*1668Smckusick 3*1668Smckusick static char sccsid[] = "@(#)NIL.c 1.1 10/30/80"; 4*1668Smckusick 5*1668Smckusick #include "h00vars.h" 6*1668Smckusick #include "h01errs.h" 7*1668Smckusick 8*1668Smckusick char * 9*1668Smckusick NIL(ptr) 10*1668Smckusick 11*1668Smckusick char *ptr; /* pointer to struct */ 12*1668Smckusick { 13*1668Smckusick if (ptr > _maxptr || ptr < _minptr) { 14*1668Smckusick ERROR(ENILPTR, 0); 15*1668Smckusick return; 16*1668Smckusick } 17*1668Smckusick return ptr; 18*1668Smckusick } 19