Atari ST series Technical Reference Manual page 282

Fwrite()
T h is f u n c t i o n w r i t e s a s p e c if ie d n u m b e r o f b y t e s to a n o p e n file .
C macro format
l o n g s t a t u s , b y t e s ;
in t h a n d l e ;
c h a r ^ b u ff e r ;
s t a t u s = F w r i t e ( h a n d l e , b y t e s , b u f f e r );
Machine language format
m o v e .l b u f f e r , - (s p )
m o v e .l # b y t e s , - (s p )
m o v e .l # h a n d l e , - (s p )
# $ 4 0 , - ( s p )
m o v e . w
t r a p
# 1
a d d .l # 1 2 , s p
Inputs
l o n g
b u f f e r
l o n g
b y t e s
h a n d l e w o r d
Results
DO s t a t u s w o r d
See also
F o p e n ( ) , F c l o s e ( )
274
Fwrite
Write File
A p o i n t e r t o t h e b u f f e r w h e r e t h e d a t a to
b e w r i t t e n is s t o r e d .
T h e n u m b e r o f b y t e s t o w r i t e . N o t e : T h is
m u s t b e a l o n g v a l u e .
T h e file h a n d l e o f t h e file to w r i t e to .
If t h e f u n c t i o n s u c c e e d s , th e a c t u a l n u m b e r o f b y t e s
w r i t t e n is r e t u r n e d . If n o t , a n e g a t i v e G E M D O S e r ­
r o r n u m b e r is r e t u r n e d
Opcode = 64 ($40)