program BuildFile;

var s: string[1];
    fname: string[30];
    strdata: string[100];
    lines,fblk,i: integer;
    f: text;

begin
  writeln; writeln('BLDTST - build ACORN test file'); writeln;
  s := ' ';
  strdata := 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
  write('Enter file name (not a .TEXT) :  '); readln(fname);
  rewrite(f,fname);  writeln('File open: ',fname);
  writeln;

  write('Enter number of blocks to build file :  '); readln(fblk);

  {calc number of lines to write in file: line is 64 bytes.}
  {lines = total blks * (blocksize / line length) }

  lines := fblk * 8; writeln('Total number of lines: ',lines:1); writeln;

  write('Writing line...');
  for i := 1 to lines do
      begin
      writeln(f,'LINE ',i:5,' ',strdata); write(i:5);
      {rotate characters through string}
      s[1] := strdata[1]; delete(strdata,1,1);
      strdata := concat( strdata, s );
      if (i mod 16) = 0 then writeln;
      end;

  writeln; writeln('Closing file: ',fname);
  close(f,lock);
  writeln('Finished.');
end.