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cc65/libsrc/atari/do_oserr.s

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;
; this routine updates errno. do a JMP here right after calling
; CIOV. we expect status in Y.
; __retminus is a routine with returns AX with $FFFF
;
.include "errno.inc"
.export __do_oserror, __retminus
__do_oserror:
sty __oserror ; save os dependent error code
__retminus:
lda #$FF
tax ; return -1
rts