IMPLEMENTATION MODULE LongIO;
(* Builds the text with LongStr and writes it through IOChan. *)

IMPORT IOChan, LongStr, ConvTypes;

PROCEDURE WritePadded (cid : IOChan.ChanId; VAR s : ARRAY OF CHAR;
                       width : CARDINAL);
  VAR n, i : CARDINAL;
    pad : ARRAY [0 .. 127] OF CHAR;
BEGIN
  n := 0;
  WHILE (n <= HIGH(s)) AND (s[n] # CHR(0)) DO INC(n) END;
  IF width > n THEN
    i := 0;
    WHILE (i < width - n) AND (i <= HIGH(pad)) DO
      pad[i] := " "; INC(i)
    END;
    pad[i] := CHR(0);
    IOChan.WriteString(cid, pad)
  END;
  IOChan.WriteString(cid, s)
END WritePadded;

PROCEDURE WriteFloat (cid : IOChan.ChanId; real : LONGREAL;
                      sigFigs : CARDINAL; width : CARDINAL);
  VAR s : ARRAY [0 .. 127] OF CHAR;
BEGIN
  LongStr.RealToFloat(real, sigFigs, s);
  WritePadded(cid, s, width)
END WriteFloat;

PROCEDURE WriteEng (cid : IOChan.ChanId; real : LONGREAL;
                    sigFigs : CARDINAL; width : CARDINAL);
  VAR s : ARRAY [0 .. 127] OF CHAR;
BEGIN
  LongStr.RealToEng(real, sigFigs, s);
  WritePadded(cid, s, width)
END WriteEng;

PROCEDURE WriteFixed (cid : IOChan.ChanId; real : LONGREAL;
                      place : INTEGER; width : CARDINAL);
  VAR s : ARRAY [0 .. 127] OF CHAR;
BEGIN
  LongStr.RealToFixed(real, place, s);
  WritePadded(cid, s, width)
END WriteFixed;

PROCEDURE WriteReal (cid : IOChan.ChanId; real : LONGREAL;
                     width : CARDINAL);
BEGIN
  IF width <= 16 THEN
    WriteFixed(cid, real, 6, width)
  ELSE
    WriteFloat(cid, real, 6, width)
  END
END WriteReal;

PROCEDURE ReadReal (cid : IOChan.ChanId; VAR real : LONGREAL);
  VAR s : ARRAY [0 .. 255] OF CHAR;
    res : ConvTypes.ConvResults;
BEGIN
  IOChan.ReadString(cid, s);
  LongStr.StrToReal(s, real, res)
END ReadReal;

END LongIO.