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cc65/libsrc/tgi/tgi_geterror.s

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;
; Ullrich von Bassewitz, 21.06.2002
;
; unsigned char __fastcall__ tgi_geterror (void);
; /* Return the error code for the last operation. This will also clear the
; * error.
; */
.include "tgi-kernel.inc"
.export _tgi_geterror
_tgi_geterror:
jsr tgi_geterror ; First call driver
ldx #$00 ; Clear high byte
ldy _tgi_error ; Test high level error code
beq @L1 ; Branch if no high level error code
tya ; Use high level code if we have one
stx _tgi_error ; Clear high level error code
@L1: rts