Int 21/AH=23h

DOS 1+ - GET FILE SIZE FOR FCB

AH = 23h
DS:DX -> unopened FCB (see #01345), wildcards not allowed

Return:
AL = status
00h successful (matching file found)
FCB random record field filled with size in records, rounded up
to next full record
FFh failed (no matching file found)

Notes: Not supported by MS Windows 3.0 DOSX.EXE DOS extender. MS-DOS returns nonsense if the FCB record number field is set to a very large positive number, and status FFh if negative; DR DOS returns the correct file size in both cases

BUG: APPEND for DOS 3.3+ corrupts DX if the file is not found

See Also: AH=42h

Category: DOS Kernel - Int 21h - D

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