Synopsis #

Header: fxcg/display.h (Not yet in libfxcg)
Syscall index: 0x01F1
Function signature: int Cursor_SetPosition(int x, int y)

Sets the cursor position for Print_OS.

Parameters #

• x Must be in range of [0,20]
• y Must be in range of [0,7]

Returns #

0 on failure, 1 on success.

Comments #

This function like locate_OS does bounds checking. It is better to use this function as opposed to locate_OS to avoid a duplication of bounds checking.

Cursor_SetPosition:
    cmp/pz  r4
    bf      Cursor_SetPosition_OutOfBounds
    mov     #21, r2
    cmp/ge  r2, r4
    bt      Cursor_SetPosition_OutOfBounds
    cmp/pz  r5
    bf      Cursor_SetPosition_OutOfBounds
    mov     #8, r2
    cmp/ge  r2, r5
    bf      loc_8004E744

Cursor_SetPosition_OutOfBounds:
    rts
    mov     #0, r0
! ---------------------------------------------------------------------------

loc_8004E744:
    mov.l   #CursorXpos, r1
    mov     #1, r0
    mov.l   #CursorYpos, r6
    mov.l   r4, @r1
    rts
    mov.l   r5, @r6
! End of function Cursor_SetPosition