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(* Args.mod provide access to command line arguments.
Copyright (C) 2001-2024 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE Args ;
FROM UnixArgs IMPORT GetArgC, GetArgV ;
FROM ASCII IMPORT nul ;
CONST
MaxArgs = 255 ;
MaxString = 4096 ;
(*
Source allows us to examine the ArgV contents.
*)
VAR
Source: POINTER TO ARRAY [0..MaxArgs] OF
POINTER TO ARRAY [0..MaxString] OF CHAR ;
(*
GetArg - returns the nth argument from the command line.
The success of the operation is returned.
*)
PROCEDURE GetArg (VAR a: ARRAY OF CHAR; n: CARDINAL) : BOOLEAN ;
VAR
i : INTEGER ;
High,
j : CARDINAL ;
BEGIN
i := VAL (INTEGER, n) ;
j := 0 ;
High := HIGH(a) ;
IF i < GetArgC ()
THEN
Source := GetArgV () ;
WHILE (j<High) AND (Source^[i]^[j]#nul) DO
a[j] := Source^[i]^[j] ;
INC(j)
END
END ;
IF j<=High
THEN
a[j] := nul
END ;
RETURN i < GetArgC ()
END GetArg ;
(*
Narg - returns the number of arguments available from
command line.
*)
PROCEDURE Narg () : CARDINAL ;
BEGIN
RETURN GetArgC ()
END Narg ;
END Args.
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