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ffa_ch4_ffacalc.kv      1 ------------------------------------------------------------------------------
ffa_ch4_ffacalc.kv      2 ------------------------------------------------------------------------------
ffa_ch4_ffacalc.kv      3 -- This file is part of 'Finite Field Arithmetic', aka 'FFA'.               --
ffa_ch4_ffacalc.kv      4 --                                                                          --
ffa_ch4_ffacalc.kv      5 -- (C) 2017 Stanislav Datskovskiy ( www.loper-os.org )                      --
ffa_ch4_ffacalc.kv      6 -- http://wot.deedbot.org/17215D118B7239507FAFED98B98228A001ABFFC7.html     --
ffa_ch4_ffacalc.kv      7 --                                                                          --
ffa_ch4_ffacalc.kv      8 -- You do not have, nor can you ever acquire the right to use, copy or      --
ffa_ch4_ffacalc.kv      9 -- distribute this software ; Should you use this software for any purpose, --
ffa_ch4_ffacalc.kv     10 -- or copy and distribute it to anyone or in any manner, you are breaking   --
ffa_ch4_ffacalc.kv     11 -- the laws of whatever soi-disant jurisdiction, and you promise to         --
ffa_ch4_ffacalc.kv     12 -- continue doing so for the indefinite future. In any case, please         --
ffa_ch4_ffacalc.kv     13 -- always : read and understand any software ; verify any PGP signatures    --
ffa_ch4_ffacalc.kv     14 -- that you use - for any purpose.                                          --
ffa_ch4_ffacalc.kv     15 --                                                                          --
ffa_ch4_ffacalc.kv     16 -- See also http://trilema.com/2015/a-new-software-licensing-paradigm .     --
ffa_ch4_ffacalc.kv     17 ------------------------------------------------------------------------------
ffa_ch4_ffacalc.kv     18 ------------------------------------------------------------------------------
ffa_ch4_ffacalc.kv     19 
ffa_ch4_ffacalc.kv     20 with System; use System;
ffa_ch4_ffacalc.kv     21 
ffa_ch4_ffacalc.kv     22 package body CmdLine is
ffa_ch4_ffacalc.kv     23    
ffa_ch4_ffacalc.kv     24    -- Test if GNAT's cmdline mechanism is available
ffa_ch4_ffacalc.kv     25    function Initialized return Boolean is
ffa_ch4_ffacalc.kv     26       gnat_argv : System.Address;
ffa_ch4_ffacalc.kv     27       pragma Import (C, gnat_argv, "gnat_argv");
ffa_ch4_ffacalc.kv     28 
ffa_ch4_ffacalc.kv     29    begin
ffa_ch4_ffacalc.kv     30       return gnat_argv /= System.Null_Address;
ffa_ch4_ffacalc.kv     31    end Initialized;
ffa_ch4_ffacalc.kv     32    
ffa_ch4_ffacalc.kv     33    
ffa_ch4_ffacalc.kv     34    -- Fill the provided string with the text of Number-th cmdline arg
ffa_ch4_ffacalc.kv     35    procedure Get_Argument(Number : in  Natural;
ffa_ch4_ffacalc.kv     36                           Result : out String) is
ffa_ch4_ffacalc.kv     37    begin
ffa_ch4_ffacalc.kv     38       if Number >= Arg_Count or (not Initialized) then
ffa_ch4_ffacalc.kv     39          raise Constraint_Error;
ffa_ch4_ffacalc.kv     40       end if;
ffa_ch4_ffacalc.kv     41       
ffa_ch4_ffacalc.kv     42       declare
ffa_ch4_ffacalc.kv     43          L   : constant Integer := Len_Arg(Number);
ffa_ch4_ffacalc.kv     44          Arg : aliased String(1 .. L);
ffa_ch4_ffacalc.kv     45       begin
ffa_ch4_ffacalc.kv     46          -- Will it fit into the available space?
ffa_ch4_ffacalc.kv     47          if L > Result'Length then
ffa_ch4_ffacalc.kv     48             raise Constraint_Error;
ffa_ch4_ffacalc.kv     49          end if;
ffa_ch4_ffacalc.kv     50          
ffa_ch4_ffacalc.kv     51          -- Get this arg string from where GNAT stowed it
ffa_ch4_ffacalc.kv     52          Fill_Arg(Arg'Address, Number);
ffa_ch4_ffacalc.kv     53          
ffa_ch4_ffacalc.kv     54          -- Copy it to Result:
ffa_ch4_ffacalc.kv     55          Result := (others => ' ');
ffa_ch4_ffacalc.kv     56          Result(Arg'Range) := Arg;
ffa_ch4_ffacalc.kv     57       end;
ffa_ch4_ffacalc.kv     58    end Get_Argument;
ffa_ch4_ffacalc.kv     59    
ffa_ch4_ffacalc.kv     60 end CmdLine;