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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 package body OS is
ffa_ch4_ffacalc.kv     21    
ffa_ch4_ffacalc.kv     22    -- Receive a character from the TTY, and True if success (False if EOF)
ffa_ch4_ffacalc.kv     23    function Read_Char(C : out Character) return Boolean is
ffa_ch4_ffacalc.kv     24       i : int;
ffa_ch4_ffacalc.kv     25       Result : Boolean := False;
ffa_ch4_ffacalc.kv     26    begin
ffa_ch4_ffacalc.kv     27       i := GetChar;
ffa_ch4_ffacalc.kv     28       if i /= EOF then
ffa_ch4_ffacalc.kv     29          C := Character'Val(i);
ffa_ch4_ffacalc.kv     30          Result := True;
ffa_ch4_ffacalc.kv     31       end if;
ffa_ch4_ffacalc.kv     32       return Result;
ffa_ch4_ffacalc.kv     33    end Read_Char;
ffa_ch4_ffacalc.kv     34    
ffa_ch4_ffacalc.kv     35    
ffa_ch4_ffacalc.kv     36    -- Send a character to the TTY.
ffa_ch4_ffacalc.kv     37    procedure Write_Char(C : in Character) is
ffa_ch4_ffacalc.kv     38       R : int;
ffa_ch4_ffacalc.kv     39       pragma Unreferenced(R);
ffa_ch4_ffacalc.kv     40    begin
ffa_ch4_ffacalc.kv     41       R := PutChar(int(Character'Pos(C)));
ffa_ch4_ffacalc.kv     42    end Write_Char;
ffa_ch4_ffacalc.kv     43    
ffa_ch4_ffacalc.kv     44    
ffa_ch4_ffacalc.kv     45    -- Send a Newline to the TTY.
ffa_ch4_ffacalc.kv     46    procedure Write_Newline is
ffa_ch4_ffacalc.kv     47    begin
ffa_ch4_ffacalc.kv     48       Write_Char(Character'Val(16#A#));
ffa_ch4_ffacalc.kv     49    end Write_Newline;
ffa_ch4_ffacalc.kv     50    
ffa_ch4_ffacalc.kv     51    
ffa_ch4_ffacalc.kv     52    -- Exit with an error condition report.
ffa_ch4_ffacalc.kv     53    procedure Eggog(M : String) is
ffa_ch4_ffacalc.kv     54    begin
ffa_ch4_ffacalc.kv     55       for i in 1 .. M'Length loop
ffa_ch4_ffacalc.kv     56          To_Stderr(M(I));
ffa_ch4_ffacalc.kv     57       end loop;
ffa_ch4_ffacalc.kv     58       
ffa_ch4_ffacalc.kv     59       -- Emit LF
ffa_ch4_ffacalc.kv     60       To_Stderr(Character'Val(16#A#));
ffa_ch4_ffacalc.kv     61       
ffa_ch4_ffacalc.kv     62       -- Exit
ffa_ch4_ffacalc.kv     63       Quit(Sadness_Code);
ffa_ch4_ffacalc.kv     64    end;
ffa_ch4_ffacalc.kv     65    
ffa_ch4_ffacalc.kv     66 end OS;