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module lpri; % Functions for printing diagnostic and error messages.

% Author: Anthony C. Hearn.

% Copyright (c) 1987 The RAND Corporation.  All rights reserved.

fluid '(!*defn !*echo !*fort !*int !*msg !*nat !*protfg errmsg!*);

global '(cursym!* erfg!* ofl!* outl!*);

symbolic procedure lpri u;
   begin
    a:  if null u then return nil;
        prin2 car u;
        prin2 " ";
        u := cdr u;
        go to a
   end;

symbolic procedure lpriw (u,v);
   begin scalar x;
        u := u . if v and atom v then list v else v;
        if ofl!* and (!*fort or not !*nat or !*defn) then go to c;
        terpri();
    a:  lpri u;
        terpri();
        if null x then go to b;
        wrs cdr x;
        return nil;
    b:  if null ofl!* then return nil;
    c:  x := ofl!*;
        wrs nil;
        go to a
   end;

symbolic procedure lprim u;
   !*msg and lpriw("***",u);

symbolic procedure lprie u;
   begin scalar x;
        if !*int then go to a;
        x:= !*defn;
        !*defn := nil;
    a:  erfg!* := t;
        lpriw ("*****",u);
        if null !*int then !*defn := x
   end;

symbolic procedure printty u;
   begin scalar ofl;
        if null !*fort and !*nat then print u;
        if null ofl!* then return nil;
        ofl := ofl!*;
        wrs nil;
        print u;
        wrs cdr ofl
   end;

symbolic procedure rerror(packagename,number,message);
   progn(errmsg!* := message, rederr message);

symbolic procedure rederr u;
   begin if not !*protfg then lprie u; error1() end;

symbolic procedure symerr(u,v);
   begin scalar x;
        erfg!* := t;
        if numberp cursym!* or not(x := get(cursym!*,'prtch))
          then x := cursym!*;
        terpri();
        if !*echo then terpri();
	outl!* := reversip!*(car outl!* . '!$!$!$ . cdr outl!*);
        comm1 t;
   a:   if null outl!* then go to b;
	prin2 car outl!*;
	outl!* := cdr outl!*;
	go to a;
   b:   terpri();
	if null v then rerror('rlisp,5,u)
	 else rerror('rlisp,6,
		     x . ("invalid" .
			 (if u then list("in",u,"statement") else nil)))
   end;

symbolic procedure typerr(u,v); rerror('rlisp,6,list(u,"invalid as",v));

endmodule;

end;