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cc65/libsrc/joystick/joy_unload.s

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974 B
ArmAsm
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;
; Ullrich von Bassewitz, 2002-11-29
;
; unsigned char joy_unload (void);
; /* Unload the currently loaded driver. */
.include "joy-kernel.inc"
.include "joy-error.inc"
.include "modload.inc"
.import joy_clear_ptr
.import return0
_joy_unload:
lda _joy_drv
pha ; Save pointer to driver
ora _joy_drv+1
beq no_driver ; No driver
lda _joy_drv+1
pha
jsr _joy_uninstall ; Uninstall the driver
pla
tax
pla ; Get pointer to driver
jsr _mod_free ; Free the driver
jmp return0 ; Return JOY_ERR_OK
no_driver:
tax ; X = 0
pla ; Remove pushed junk
lda #JOY_ERR_NO_DRIVER
rts