/usr/share/doc/libncursesada-doc/examples/ncurses2-getopt.adb is in libncursesada-doc 6.0.20150808-2.
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-- --
-- GNAT ncurses Binding Samples --
-- --
-- ncurses --
-- --
-- B O D Y --
-- --
------------------------------------------------------------------------------
-- Copyright (c) 2000-2008,2011 Free Software Foundation, Inc. --
-- --
-- Permission is hereby granted, free of charge, to any person obtaining a --
-- copy of this software and associated documentation files (the --
-- "Software"), to deal in the Software without restriction, including --
-- without limitation the rights to use, copy, modify, merge, publish, --
-- distribute, distribute with modifications, sublicense, and/or sell --
-- copies of the Software, and to permit persons to whom the Software is --
-- furnished to do so, subject to the following conditions: --
-- --
-- The above copyright notice and this permission notice shall be included --
-- in all copies or substantial portions of the Software. --
-- --
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS --
-- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF --
-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. --
-- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, --
-- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR --
-- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR --
-- THE USE OR OTHER DEALINGS IN THE SOFTWARE. --
-- --
-- Except as contained in this notice, the name(s) of the above copyright --
-- holders shall not be used in advertising or otherwise to promote the --
-- sale, use or other dealings in this Software without prior written --
-- authorization. --
------------------------------------------------------------------------------
-- Author: Eugene V. Melaragno <aldomel@ix.netcom.com> 2000
-- Version Control
-- $Revision: 1.8 $
-- $Date: 2011/03/19 12:09:51 $
-- Binding Version 01.00
------------------------------------------------------------------------------
-- A simplified version of the GNU getopt function
-- copyright Free Software Foundtion
with Ada.Strings.Fixed;
with Ada.Strings.Bounded;
with Ada.Text_IO; use Ada.Text_IO;
package body ncurses2.getopt is
nextchar : Natural := 0;
-- Ncurses doesn't use the non option elements so we are spared
-- the job of computing those.
-- also the user is not allowed to modify argv or argc
-- Doing so is Erroneous execution.
-- long options are not handled.
procedure Qgetopt (retval : out Integer;
argc : Integer;
argv : stringfunc;
-- argv will be the Argument function.
optstring : String;
optind : in out Integer;
-- ignored for ncurses, must be initialized to 1 by
-- the caller
Optarg : out stringa
-- a garbage collector would be useful here.
) is
package BS is new Ada.Strings.Bounded.Generic_Bounded_Length (200);
use BS;
optargx : Bounded_String;
begin
if argc < optind then
retval := -1;
return;
end if;
optargx := To_Bounded_String ("");
if nextchar = 0 then
if argv (optind) = "--" then
-- the rest are non-options, we ignore them
retval := -1;
return;
end if;
if argv (optind)(1) /= '-' or argv (optind)'Length = 1 then
optind := optind + 1;
Optarg := new String'(argv (optind));
retval := 1;
return;
end if;
nextchar := 2; -- skip the one hyphen.
end if;
-- Look at and handle the next short option-character.
declare
c : Character := argv (optind) (nextchar);
temp : constant Natural :=
Ada.Strings.Fixed.Index (optstring, String'(1 => c));
begin
if temp = 0 or c = ':' then
Put_Line (Standard_Error,
argv (optind) & ": invalid option -- " & c);
c := '?';
return;
end if;
if optstring (temp + 1) = ':' then
if optstring (temp + 2) = ':' then
-- This is an option that accepts an argument optionally.
if nextchar /= argv (optind)'Length then
optargx := To_Bounded_String
(argv (optind) (nextchar .. argv (optind)'Length));
else
Optarg := null;
end if;
else
-- This is an option that requires an argument.
if nextchar /= argv (optind)'Length then
optargx := To_Bounded_String
(argv (optind) (nextchar .. argv (optind)'Length));
optind := optind + 1;
elsif optind = argc then
Put_Line (Standard_Error,
argv (optind) &
": option requires an argument -- " & c);
if optstring (optstring'First) = ':' then
c := ':';
else
c := '?';
end if;
else
-- increment it again when taking next ARGV-elt as argument.
optind := optind + 1;
optargx := To_Bounded_String (argv (optind));
optind := optind + 1;
end if;
end if;
nextchar := 0;
else -- no argument for the option
if nextchar = argv (optind)'Length then
optind := optind + 1;
nextchar := 0;
else
nextchar := nextchar + 1;
end if;
end if;
retval := Character'Pos (c);
Optarg := new String'(To_String (optargx));
return;
end;
end Qgetopt;
end ncurses2.getopt;
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