set_mouse_range - Sets the area of the screen restricting mouse movement. Allegro game programming

       Sets the area of the screen within which the mouse can move. Pass the top  left  corner  and  the  bottom
       right  corner  (inclusive).  If  you  don't  call  this function the range defaults to (0, 0, SCREEN_W-1,
       SCREEN_H-1).

       set_mouse_range  -  Sets  the  area  of  the  screen restricting mouse movement. Allegro game programming
       library.

install_mouse(3alleg4), set_mouse_speed(3alleg4), position_mouse(3alleg4)

Allegro                                           version 4.4.3                         set_mouse_range(3alleg4)

#include<allegro.h>voidset_mouse_range(intx1,inty1,intx2,inty2);