DOS Fn 17H: Rename File via FCB

                                                         Compatibility: 1.0+ 
 Expects: AH    17H
          DS:DX address of a special-format FCB
          ──────────────────────────────────────────────────────────────────
 Returns: AL    0    if the file was renamed successfully
                0ffH file not found, new name already exists, other error
          ──────────────────────────────────────────────────────────────────
    Info: Renames a file in the current default directory.  Use the
          following layout for renaming files with this function:

              ╔══► 0=default, 1=A, 2=B, etc.
offset  len ┌─╨─┬───────────────────────────────┬───────────┐
 +0     0cH │drv│ F   I   L   E   N   A   M   E │ E   X   T │ ◄════ oldname
            ├───┴───┴───┴───┴───┴───┼───┴───┴───┴───┴───┴───┘
 +0cH    6  │       reserved        │
            ├───┴───┴───┴───┴───┴───┴───────┬────────────┐
 +11H   0bH │ F   I   L   E   N   A   M   E │ E   X   T  │  ◄══════ newname
            └───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴────┘

          Either name may contain ? wildcard▲ characters:
          ■ In the oldname a wildcard causes a search for all matches in
            the default directory and renames each matching filespec.
          ■ In the newname it means: use the same character as found in
            that position in the oldname.

   Notes: ■ This function allows you to rename a directory by using an
            Extended FCB with the proper file attribute for the oldname.

See Also: Fn 56H (rename/move file)
          Directory and File Functions
          DOS Functions
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