Get the current screen size

 
/* sample routine to get the current screensize for textmode windows  */
/* without using REXXUTIL functions.                                  */

  parse value GetDisplaySize() with columns rows
  say "The current OS/2 window size is " || ,
      rows || " rows and " || columns || " columns."
exit 0

/* ------------------------------------------------------------------ */
/* function: Get the current display size                             */
/*                                                                    */
/* call:     GetDisplaySize                                           */
/*                                                                    */
/* returns:  columns rows                                             */
/*                                                                    */
/* note:     This function works only for display sizes up to 200 for */
/*           columns or rows. The upper left corner is 1,1.           */
/*           The REXXUTIL function SysCurPos uses zero based values   */
/*           (the upper left corner is 0,0).                          */
/*                                                                    */
GetDisplaySize: PROCEDURE expose thisPos

  usedChars = ":;<=>?@ABCD"

                    /* save current cursor position                   */
  rc = CharOut(, D2C(27) || '[' || "6n")
  pull curPos

                    /* try to set the cursor to the position 200,200  */
  rc = CharOut(, D2C(27) || '[' || "200;200H" )

                    /* get cursor position                            */
  rc = CharOut(, D2C(27) || '[' || "6n")
  pull tPos

                    /* restore current cursor position                */
  rc = CharOut(, substr( curPos,1, length( curPos)-1) || "H" )

                                                             /* v2.30 */
  parse var tPos 3 y1 +1 y2 +1 3 rows +2 6 x1 +1 x2 +1 6 cols +2 .

  if pos( y1, usedChars ) <> 0 then
    rows = 10 || y2

  if pos( x1, usedChars ) <> 0 then
    cols = 10 || x2

RETURN cols rows