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cc65/libsrc/atari/write.s
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ArmAsm

;
; write(iocb, buf, nbytes)->nbytes written
;
.include "atari.inc"
.import __rwsetup,__do_oserror,__inviocb,__oserror
.export _write
_write:
jsr __rwsetup ; do common setup
beq write9 ; if size 0, it's a no-op
cpx #$FF ; invalid iocb?
beq _inviocb
lda #PUTCHR
sta ICCOM,x
jsr CIOV
bpl write9
jmp __do_oserror ; update errno
write9:
lda ICBLL,x ; get buf len lo
pha
lda ICBLH,x ; buf len hi
tax
lda #0
sta __oserror ; clear system dependend error code
pla
rts
_inviocb:
jmp __inviocb