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OTHER SYSTEM FUNCTIONS
27.5 -- Other Functions
Bit
1
=
1
indicates
that
a
family
indicator was round in the suffix.
Bit
2
1
indicates
that
a
device
specification was found.
Bits 3-6 are unused and will be zero.
Bit 7
=
1 indicates a null file name
was
found.
This
does
not
necessarily
mean that
a
null
suffix
or
a
null
logical unit
numbe~
was found.
X
is unchanged.
CC is indeterminate.
The scan pointer (first
t~o
b~tes
of file
packet) will contain the
address
of
the
character
that
te~minated
the
scan.
The standard file
name
pointer
(second
two
bytes
of file packet) will have
been
incremented
by
eleven <P9ints to
location rollowing the
suf~ix).
The
standard
file
name
a~ea
is
only
changed
if
a
co~responding
element is found in the input
buffe~.
Thus,
if
no
logical
unit
number
is
found in the input burrer, the
logical unit part of the standard file
name
area will not
be
changed..
The
same
is
true
ror the file name and for the
surfix
fields.
This
feature
allows
approp~iate
default
values
for the logical unit number, file name, and suffix to
be placed into the standard file name area before
.PFNAM
is
invoked.
Then,
after
the
input
bufrer is scanned, those
parts
of
the
file
name
specification
which
were
not
explicitly
found
will
assume the default values which
were
unchanged.
No delimiters of any sort
are
placed into
the
standard
file
name
area.
The presence of device name indicators and
family indicators is indicated by the return status in the
B
register
only.
The
rile
name (or device name) and suffix
will be left Justified within the
file
name
aTea.
Unused
parts
of
the
file
name
or
suffix
~ill
be space-filled
automat
i
c a 11
y .
When the scan is initiated,
leading spaces in
front
of
the
file
name
or device specification will be treated as a
sing Ie space
(ignQred).
Any
space,
however,
encounte~ed
after the first character of a specification is found will be
treated as a terminator.
Page
27-37
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