Atari ST series - Page 282

Fwrite
Write File
Fwrite() Opcode = 64 ($40)
T his fu nction w rite s a sp e cified n u m b er of b y tes to a n o p en file.
C macro format
lo n g s ta tu s, b y te s;
in t h an d le;
c h a r ^bu ffer;
statu s = F w rite(h a n d le , b y te s, b uffer);
Machine language format
m o v e .l b uffer, - (sp )
m o v e .l # b y t e s , - (sp )
m o v e .l # h a n d le , - (sp)
m o v e .w
# $ 4 0 , - ( s p )
trap
# 1
a d d .l # 1 2 , sp
Inputs
b uffer
lo n g A p o in te r to th e bu ffe r w h ere th e d ata to
b e w ritte n is sto re d .
b y tes
lo n g
T he n u m b e r of b yte s to w rite . N o te : T h is
m u st be a lon g valu e.
h an d le
w o rd
T he file h an d le o f th e file to w rite to .
Results
DO statu s w o rd If th e fu n ction su cce e d s, th e actu al n u m b er of b ytes
w ritten is retu rn ed . If n o t, a n eg ativ e G EM D O S e r
ro r n u m b er is re tu rn ed
See also
F o p e n (), F c lo s e ()
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