MODULE TestCopy;
(* Copy a textfile with ISO-Modula-2 I/O-Library
   reading the in- and out-file specification
   as parameter from the command line.

Example: The OpenVMS command

$ run testcopy
$_ x.lis y.lis

copies file x.lis to file y.lis.
When installed as a foreign command, the arguments
can be specified in the command line:

$ testcopy :== $dev:[dir]testcopy.exe
$ testcopy x.lis y.lis

Copyright (1993-1996) by Guenter Dotzel
http://www.modulaware.com/

GD/1993
*)
FROM ProgramArgs IMPORT IsArgPresent, ArgChan;
FROM IOResult IMPORT ReadResults, ReadResult;  
FROM SeqFile IMPORT OpenRead, OpenWrite, OpenResults,
  Close, ChanId, read, write;
FROM TextIO IMPORT ReadRestLine, SkipLine, ReadToken,
  WriteLn, WriteString;
IMPORT STextIO, SWholeIO;

TYPE fnam= ARRAY [0..254] OF CHAR;
VAR in,out: fnam;
  ores: OpenResults;
  input, output: ChanId;
  line: ARRAY[0..8191] OF CHAR;
  lines: INTEGER;

PROCEDURE usage;
BEGIN
  STextIO.WriteString("TestCopy usage: 'testcopy IN.EXT OUT.EXT'");
  STextIO.WriteLn;
END usage;

BEGIN
  lines:=0;
  IF IsArgPresent() THEN
    ReadToken(ArgChan(), in);
    IF IsArgPresent() THEN
      ReadToken(ArgChan(), out);
      OpenRead(input, in, read, ores); 
      IF ores=opened THEN
        OpenWrite(output, out, write, ores);
        IF ores=opened THEN
          ReadRestLine(input, line);
          WHILE ReadResult(input) <> endOfInput DO
            IF ReadResult(input) = allRight THEN 
              WriteString(output, line); WriteLn(output);
              INC(lines);
            ELSIF ReadResult(input) = endOfLine THEN
              WriteLn(output);
              INC(lines);
            ELSE
              STextIO.WriteString("TestCopy error reading infile");
              STextIO.WriteLn;
              HALT;
            END;
            SkipLine(input); ReadRestLine(input, line);
          END;
          Close(input);
        ELSE
          STextIO.WriteString("TestCopy can't create outfile");
          STextIO.WriteLn;
        END;
        Close(output);
        STextIO.WriteString("TestCopy: endOfInput reached, lines copied=");
        SWholeIO.WriteInt(lines,0);
        STextIO.WriteLn;
      ELSE
        STextIO.WriteString("TestCopy can't open infile");
        STextIO.WriteLn;
      END;
    ELSE usage;
    END;
  ELSE usage;
  END;
END TestCopy.