Chapter
1
I
System Calls
DirSearchFirst
Search
for
First Entry
Function
Call
1lH
Searches the
disk
directory
for
the first name that matches the
filename in the FCB. The name can have the
?
wildcard charac-
ter to match any character. To search
for
hidden or system files,
DS:DX must point
to
the first byte
of
the extended FCB prefix.
If
a
directory entry
for
the filename in the
FCB
is found, an un-
opened FCB
of
the same type (normal
or
extended) is created at
the Disk Transfer Address.
If an extended FCB is pointed to by DS:DX, the following search
pattern is used:
0
If the attribute byte (offset FCB-1) is zero, only normal file
entries are found. Entries for the volume label, subdirectories,
hidden files, and system files will not be returned.
If the attribute field is set
for
hidden or system files,
or
direc-
tory entries, it is considered an inclusive search. All normal
file entries plus all entries matching the specified attributes
are returned.
To
look
at
all directory entries except the vol-
ume label, the attribute byte can be set to hidden
+
system
+
directory (all
3
bits set).
0
If the attribute field is set for the volume label, it is consid-
ered an exclusive search, and only the volume label entry is
returned.
Entry Conditions:
AH
=
11H
DS:DX
=
pointer to the unopened
FCB
of the file for
which
to
search
E
xi
t
Conditions
:
If
AL
=
OOH, a directory entry was found.
If AL
=
FFH, no directory entry was found.
52
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