(* varargs.def provides a basic vararg facility for GNU Modula-2.

Copyright (C) 2015-2025 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius@glam.ac.uk>.

This file is part of GNU Modula-2.

GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Modula-2; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  *)

DEFINITION MODULE varargs ;


FROM SYSTEM IMPORT BYTE ;


TYPE
   vararg ;


(*
   nargs - returns the number of arguments wrapped in, v.
*)

PROCEDURE nargs (v: vararg) : CARDINAL ;


(*
   arg - fills in, a, with the next argument.  The size of, a, must
         be an exact match with the original vararg parameter.
*)

PROCEDURE arg (v: vararg; VAR a: ARRAY OF BYTE) ;


(*
   next - assigns the next arg to be collected as, i.
*)

PROCEDURE next (v: vararg; i: CARDINAL) ;


(*
   copy - returns a copy of, v.
*)

PROCEDURE copy (v: vararg) : vararg ;


(*
   replace - fills the next argument with, a.  The size of, a,
             must be an exact match with the original vararg
             parameter.
*)

PROCEDURE replace (v: vararg; VAR a: ARRAY OF BYTE) ;


(*
   end - destructor for vararg, v.
*)

PROCEDURE end (VAR v: vararg) ;


(*
   start1 - wraps up argument, a, into a vararg.
*)

PROCEDURE start1 (a: ARRAY OF BYTE) : vararg ;


(*
   start2 - wraps up arguments, a, b, into a vararg.
*)

PROCEDURE start2 (a, b: ARRAY OF BYTE) : vararg ;


(*
   start3 - wraps up arguments, a, b, c, into a vararg.
*)

PROCEDURE start3 (a, b, c: ARRAY OF BYTE) : vararg ;


(*
   start4 - wraps up arguments, a, b, c, d, into a vararg.
*)

PROCEDURE start4 (a, b, c, d: ARRAY OF BYTE) : vararg ;


END varargs.
