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Фрагмент инструкции
HPF
OPEN
T
able
4-20.
HPF
OPEN
Itemnum/Item
V
alues
(continued)
Itemn
um
Mnemonic
Item
Description
18
@32
Short-mapp
ed:
Returns
a
short
p ointer
to
the
b eginning
of
the
data
area
of
the
le.
This
option
maps
the
le
into
short
p ointer
space.
A
short-mapp ed
le
can
b e
4
megabytes
in
length.
The
calling
pro cess
can
ha
v
e
up
to
6
megabytes
of
short-mapp ed
les
op en
at
a
time.
Use
the
p ointer
as
a
large
arra
y
of
an
y
t
yp e
to
ecien
tly
access
the
le.
A
le
previously
op ened
normally
(not
mapp
ed)
or
with
the
long-mapp
ed
option
is
not
accessible
with
the
short-mapp ed
option.
If
this
option
is
sp ecied
with
the
le
already
op ened
into
long
p ointer
space,
an
error
results.
A
loaded
program
le
or
a
loaded
library
le
is
not
accessible
with
the
short-mapp ed
option.
A
le
cannot
b e
loaded
that
is
curren
tly
op ened
with
the
short-mapp ed
option.
Sharing
of
short
p ointer
les
is
pro
vided
through
normal
le
system
sharing
mec
hanisms,
for
example,
use
of
the
exclusiv
e
option.
With
the
short-mapp ed
le,
all
le
system
intrinsics,
applicable
to
the
le,
can
b e
used.
FREAD
and
FWRITE
calls
can
b e
mixed
with
the
short-mapp ed
access.
Standard
(STD)
t
yp e
disk
les
of
xed
or
undened
record
length
can
b e
accessed
short-mapp ed
with
the
access
t
yp e
option
set
to
an
y
v
alue.
Standard
t
yp e
disk
les
of
v
ariable
record
length
can
b e
accessed
short-mapp ed
only
if
the
access
t
yp e
option
is
set
to
read-only
access.
KSAM
les
can
b e
accessed
short-mapp ed
only
if
the
access
t
yp e
option
is
set
to
read-only
access
and
the
cop
y
mo
de
option
is
set
to
1.
Directories
may
not
b e
op ened
using
short-mapp ed
access.
Default:
No
short
p ointer
returned
(ASC)
Not
used
for
async
hronous
devices.
19
I32
Record
size:
P
asses
the
size,
in
b
ytes,
of
the
logical
records
in
the
le.
V
alid
range
is
dep enden
t
up on
b oth
storage
format
(ASCI I
or
binary)
and
record
format.
F
or
xed-length
and
undened-length
ASCI I
les,
a
record
size
can
b e
sp ecied
in
the
range
1..32,767.
F
or
v
ariable-length
ASCI I
les,
and
for
xed-length,
v
ariable-length,
and
undened-length
binary
les,
a
record
size
can
b e
sp ecied
in
the
range
1..32,766.
HPFOPEN
rounds
up
o dd
v
alues
to
the
next
highest
ev
en
n
um
b er
(equiv
alen
t
to
the
nearest
half
w
ord
b oundary)
if
the
le
is
ASCI I
with
v
ariable-length
record
format,
binary
with
xed-length,
v
ariable-length,
or
undened-length
record
format.
F
or
example,
if
a
record
size
of
105
is
sp ecied
for
a
xed-length
binary
le,
HPFOPEN
sets
the
record
size
to
106;
if
a
record
size
of
233
is
sp ecied
for
a
xed-length
ASCI I
le,
the
record
size
remains
the
same
as
it
w
as
when
sp ecied.
The
v
alue
sp ecied
for
this
itemnum
is
ignored
when
a
b
yte
stream
le
or
hierarc
hical
directory
is
created.
Byte
stream
les
are
created
with
a
logical
record
size
of
one
b
yte
(1).
Hierarc
hical
directories
are
created
with
a
logical
record
size
of
32
b
ytes
(32).
Default:
256
(ASC)
F
or
terminal
and
prin
ter
les,
no
rounding
up
o ccurs
if
a
record
size
4-344
Command
Definitions
consisting
of
an
o dd
n
um
b er
of
b
ytes
is
sp ecied.
The
record
size
can
b e
dieren
t
from
the
p ort
conguration.
The
default
is
the
congured
record
size
(normally
40
w
ords
for
terminals,
66
w
ords
for
prin
ters).
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