IMPLEMENTATION MODULE StringIO;
(*
 *  REPERTOIRE
 *  Release 1.6
 *  By Charles Bradford and Cole Brecheen
 *  (c) Copyright 1985-1992 PMI
 *  Green Bay, Wisconsin
 *  All rights reserved
 *  (414) 468-6040
 *
 *  $Header:   D:/logfiles/mods/stringio.mov   1.7   17 Mar 1991 18:00:12   coleb  $
 *
 *)

IMPORT ErrStrgs;
IMPORT ErrorManager;
IMPORT LowLevel;
IMPORT M2Strings;
IMPORT SYSTEM;
IMPORT FAPI;

VAR
  Initialized : BOOLEAN;

  PROCEDURE Init();
    BEGIN
      IF Initialized THEN
        RETURN;
      ELSE
        Initialized := TRUE;
      END;
      ErrStrgs.Init();
      ErrorManager.Init();
      LowLevel.Init();
      M2Strings.Init();
      CrLf[0] := 15C;
      CrLf[1] := 12C;
    END Init;


  PROCEDURE WriteStr(FileHandle : CARDINAL; TheStr : ARRAY OF CHAR);
    VAR
      BytesWritten: CARDINAL;
      ErrorReturn: CARDINAL;
    BEGIN
      ErrorReturn := FAPI.DOSWRITE( FileHandle, SYSTEM.ADR(TheStr),
          M2Strings.Length(TheStr), SYSTEM.ADR(BytesWritten) );
     IF ErrorReturn #0 THEN
        ErrorManager.WarnNumber("DOSWRITE error", ErrorReturn);
      END;
    END WriteStr;


  PROCEDURE ReadStr(FileHandle : CARDINAL; VAR TheStr : ARRAY OF CHAR);
    VAR
      lngth : FAPI.STRINGINBUF;
      BytesRead, StrSize, CrSpot : CARDINAL;
      Distance, NewFilePtr, OldFilePtr : LONGINT;
      linefeed: ARRAY [0..0] OF CHAR;
      hAtr,hType: CARDINAL;

    PROCEDURE ReadKbd;
    VAR
      KbdState : FAPI.KBDINFO;
      s:ARRAY[0..255] OF CHAR;
    BEGIN
      (* we have to got through some contortions here because KBDSTRINGIN
         returns the  final carriage return  loosing the last chr position *)
      KbdState.cb := 10;
      KbdState.fsMask := FAPI.KEYBOARD_ECHO_ON + FAPI.KEYBOARD_ASCII_MODE;
      KbdState.chTurnAround := 0;
      KbdState.fsInterim := 0;
      KbdState.fsState := 0;
      IF 0 # FAPI.KBDSETSTATUS( SYSTEM.ADR(KbdState), FileHandle) THEN
      END;

      lngth.cb := StrSize+1;
      IF 0 # FAPI.KBDSTRINGIN( SYSTEM.ADR(s),
          SYSTEM.ADR(lngth), 0, FileHandle ) THEN
      END;
        (* KBDSTRNGIN Echos the  carriage return. *)
      WriteStr( outp, linefeed );
        (* So we make the best of it by echoing a linefeed. *)
      s[ lngth.cchIn ] := 0C;
      M2Strings.Assign(s,TheStr);
    END ReadKbd;

    BEGIN
      (*ReadStr*)
      TheStr[0] := 0C;
      linefeed[0] := CHR(10);
      StrSize := HIGH(TheStr)+1;
      (* check to see if handle is a keybourd
         under os/2 there could be other keybourd handles
         also the keybourd could be redirected to a file.
         JM 7/17/92 *)

      IF FAPI.DOSQHANDTYPE(FileHandle,SYSTEM.ADR(hType),SYSTEM.ADR(hAtr)) # 0 THEN
        ErrorManager.WARN("KBDSETSTATUS");
      END;

      IF( hType=1) AND (8001H IN BITSET( hAtr))  (*Std in and char device *)
      THEN
        ReadKbd;
      ELSE

        IF FAPI.DOSCHGFILEPTR( FileHandle,
            VAL(LONGINT, 0), 1, SYSTEM.ADR(OldFilePtr)) # 0 THEN
        END;
          (* Move 0 bytes relative to the current position in the
             file so that we can find out what our current position is. *)
        LowLevel.Fill( SYSTEM.ADR(TheStr), StrSize, 0C );
        IF FAPI.DOSREAD( FileHandle, SYSTEM.ADR(TheStr),
            StrSize, SYSTEM.ADR(BytesRead) ) = 0 THEN
          CrSpot := LowLevel.ScanEQ( BytesRead, CHR(13), SYSTEM.ADR(TheStr) );
            (* Scan for a carriage return *)
          IF (CrSpot < BytesRead) THEN
            (* We found one. *)
            TheStr[CrSpot] := 0C;
            IF (CrSpot < HIGH(TheStr)) AND (TheStr[CrSpot + 1] = CHR(10)) THEN
              (* If the next character is a linefeed *)
              INC( CrSpot );
              TheStr[CrSpot] := 0C;
            END;
            IF FAPI.DOSCHGFILEPTR( FileHandle,
                OldFilePtr + VAL(LONGINT, CrSpot+1), 0,
                SYSTEM.ADR(NewFilePtr)) # 0 THEN
            END;
          END;
        ELSE
          ErrorManager.WARN("DOSREAD error ");
        END;

      END;

    END ReadStr;


  PROCEDURE ReadString(FileHandle : CARDINAL; VAR
      TheStr : ARRAY OF CHAR; VAR EndOfFileReached:
      BOOLEAN );
    VAR
      StrSize, BytesRead, CrSpot: CARDINAL;
      OldFilePtr, NewFilePtr: LONGINT;
    BEGIN
      StrSize := HIGH(TheStr) + 1;
      IF FAPI.DOSCHGFILEPTR( FileHandle,
          VAL(LONGINT, 0), 1, SYSTEM.ADR(OldFilePtr)) # 0 THEN
      END;
        (* Move 0 bytes relative to the current position in the
           file so that we can find out what our current position is. *)
      LowLevel.Fill( SYSTEM.ADR(TheStr), StrSize, 0C );
        (* If the following read fails, maybe because we've reached
           the end of the file, it won't zero out TheStr.  We have to
           make sure TheStr is null if we're not reading a new string. *)
      IF FAPI.DOSREAD( FileHandle, SYSTEM.ADR(TheStr),
          StrSize, SYSTEM.ADR(BytesRead) ) = 0 THEN
        CrSpot := LowLevel.ScanEQ( BytesRead, CHR(13), SYSTEM.ADR(TheStr) );
          (* Scan for a carriage return *)
        IF (CrSpot < BytesRead) THEN
          (* We found one. *)
          TheStr[CrSpot] := 0C;
          BytesRead := StrSize;
          IF (CrSpot < HIGH(TheStr)) AND (TheStr[CrSpot + 1] = CHR(10)) THEN
            (* If the next character is a linefeed *)
            INC( CrSpot );
            TheStr[CrSpot] := 0C;
          END;
          IF FAPI.DOSCHGFILEPTR( FileHandle,
              OldFilePtr + VAL(LONGINT, CrSpot + 1), 0,
              SYSTEM.ADR(NewFilePtr)) # 0 THEN
          END;
        END;
      END;
      EndOfFileReached := BytesRead < StrSize;
    END ReadString;


  PROCEDURE WriteEol(FileHandle : CARDINAL; TheStr : ARRAY OF CHAR);
    VAR
      TmpStr : ARRAY [0..255] OF CHAR;
      bufstr : ARRAY [0..2] OF CHAR;
    BEGIN
      IF M2Strings.Length(TheStr)<=254 THEN
        M2Strings.Concat(TheStr, CrLf, TmpStr);
        WriteStr(FileHandle, TmpStr);
      ELSE
        WriteStr(FileHandle, TheStr);
        WriteStr(FileHandle, CrLf);
      END;
    END WriteEol;


  PROCEDURE MessageType(FunctionResult : CHAR) : CARDINAL;
    BEGIN
      RETURN ORD( FunctionResult );
    END MessageType;


  PROCEDURE PrintMessage(FunctionResult : CARDINAL);
    VAR
      TmpStr: ARRAY [0..79] OF CHAR;
    BEGIN
      ErrStrgs.NumToStr( FunctionResult, TmpStr );
      CASE FunctionResult OF
        NoError : (*do nothing*)
      | PartialRead, EndOfFile:
        WriteStr( ErrorOutp, TmpStr );
      ELSE
        ErrorManager.WARN( TmpStr );
      END;
    END PrintMessage;

BEGIN
  Initialized := FALSE;
  Init();
END StringIO.