release/src/router/libncurses/Ada95/samples/ncurses2-getopt.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                       GNAT ncurses Binding Samples                       --
   4 --                                                                          --
   5 --                                 ncurses                                  --
   6 --                                                                          --
   7 --                                 B O D Y                                  --
   8 --                                                                          --
   9 ------------------------------------------------------------------------------
  10 -- Copyright (c) 2000-2008,2011 Free Software Foundation, Inc.              --
  11 --                                                                          --
  12 -- Permission is hereby granted, free of charge, to any person obtaining a  --
  13 -- copy of this software and associated documentation files (the            --
  14 -- "Software"), to deal in the Software without restriction, including      --
  15 -- without limitation the rights to use, copy, modify, merge, publish,      --
  16 -- distribute, distribute with modifications, sublicense, and/or sell       --
  17 -- copies of the Software, and to permit persons to whom the Software is    --
  18 -- furnished to do so, subject to the following conditions:                 --
  19 --                                                                          --
  20 -- The above copyright notice and this permission notice shall be included  --
  21 -- in all copies or substantial portions of the Software.                   --
  22 --                                                                          --
  23 -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  --
  24 -- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               --
  25 -- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   --
  26 -- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   --
  27 -- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    --
  28 -- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    --
  29 -- THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               --
  30 --                                                                          --
  31 -- Except as contained in this notice, the name(s) of the above copyright   --
  32 -- holders shall not be used in advertising or otherwise to promote the     --
  33 -- sale, use or other dealings in this Software without prior written       --
  34 -- authorization.                                                           --
  35 ------------------------------------------------------------------------------
  36 --  Author: Eugene V. Melaragno <aldomel@ix.netcom.com> 2000
  37 --  Version Control
  38 --  $Revision: 1.8 $
  39 --  $Date: 2011/03/19 12:09:51 $
  40 --  Binding Version 01.00
  41 ------------------------------------------------------------------------------
  42 --  A simplified version of the  GNU getopt function
  43 --  copyright Free Software Foundtion
  44
  45 with Ada.Strings.Fixed;
  46 with Ada.Strings.Bounded;
  47 with Ada.Text_IO; use Ada.Text_IO;
  48
  49 package body ncurses2.getopt is
  50
  51    nextchar : Natural := 0;
  52
  53    --  Ncurses doesn't use the non option elements so we are spared
  54    --  the job of computing those.
  55
  56    --  also the user is not allowed to modify argv or argc
  57    --  Doing so is Erroneous execution.
  58
  59    --  long options are not handled.
  60
  61    procedure Qgetopt (retval : out Integer;
  62                       argc : Integer;
  63                       argv : stringfunc;
  64                         --  argv will be the Argument function.
  65                       optstring : String;
  66                       optind : in out Integer;
  67                         --  ignored for ncurses, must be initialized to 1 by
  68                         --  the caller
  69                       Optarg : out stringa
  70                         --  a garbage collector would be useful here.
  71                      ) is
  72
  73       package BS is new Ada.Strings.Bounded.Generic_Bounded_Length (200);
  74       use BS;
  75       optargx : Bounded_String;
  76    begin
  77
  78       if argc < optind then
  79          retval := -1;
  80          return;
  81       end if;
  82
  83       optargx := To_Bounded_String ("");
  84
  85       if nextchar = 0 then
  86
  87          if argv (optind) = "--" then
  88                            --  the rest are non-options, we ignore them
  89             retval := -1;
  90             return;
  91          end if;
  92
  93          if argv (optind)(1) /= '-' or argv (optind)'Length = 1 then
  94             optind := optind + 1;
  95             Optarg := new String'(argv (optind));
  96             retval := 1;
  97             return;
  98          end if;
  99
 100          nextchar := 2; -- skip the one hyphen.
 101       end if;
 102
 103       --  Look at and handle the next short option-character.
 104       declare
 105          c : Character := argv (optind) (nextchar);
 106          temp : constant Natural :=
 107            Ada.Strings.Fixed.Index (optstring, String'(1 => c));
 108       begin
 109          if temp = 0 or c = ':' then
 110             Put_Line (Standard_Error,
 111                       argv (optind) & ": invalid option -- " & c);
 112             c := '?';
 113             return;
 114          end if;
 115
 116          if optstring (temp + 1) = ':' then
 117             if optstring (temp + 2) = ':' then
 118                --  This is an option that accepts an argument optionally.
 119                if nextchar /= argv (optind)'Length then
 120                   optargx := To_Bounded_String
 121                     (argv (optind) (nextchar .. argv (optind)'Length));
 122                else
 123                   Optarg := null;
 124                end if;
 125             else
 126                --  This is an option that requires an argument.
 127                if nextchar /= argv (optind)'Length then
 128                   optargx := To_Bounded_String
 129                     (argv (optind) (nextchar .. argv (optind)'Length));
 130                   optind := optind + 1;
 131                elsif optind = argc then
 132                   Put_Line (Standard_Error,
 133                             argv (optind) &
 134                             ": option requires an argument -- " & c);
 135                   if optstring (optstring'First) = ':'  then
 136                      c := ':';
 137                   else
 138                      c := '?';
 139                   end if;
 140                else
 141                   --  increment it again when taking next ARGV-elt as argument.
 142                   optind := optind + 1;
 143                   optargx := To_Bounded_String (argv (optind));
 144                   optind := optind + 1;
 145                end if;
 146             end if;
 147             nextchar := 0;
 148          else -- no argument for the option
 149             if nextchar = argv (optind)'Length then
 150                optind := optind + 1;
 151                nextchar := 0;
 152             else
 153                nextchar := nextchar + 1;
 154             end if;
 155          end if;
 156
 157          retval := Character'Pos (c);
 158          Optarg := new String'(To_String (optargx));
 159          return;
 160       end;
 161    end Qgetopt;
 162
 163 end ncurses2.getopt;