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     The _splitpath routine breaks a full path name into its four
     components. The <path> argument points to a buffer containing
     the complete path name. The maximum size necessary for each
     buffer is specified by the _MAX_DRIVE, _MAX_DIR, _MAX_FNAME, and
     _MAX_EXT manifest constants (defined in STDLIB.H). The other
     arguments point to the following buffers used to store the
     path-name elements:
 
     Buffer      Description
 
     <drive>     Contains the drive letter followed by a colon (:) if a
                 drive is specified in <path>.
 
     <dir>       Contains the path of subdirectories, if any,
                 including the trailing slash. Forward slashes (/),
                 backslashes (\), or both may be present in <path>.
 
     <fname>     Contains the base file name without any extensions.
 
     <ext>       Contains the file-name extension, if any, including
                 the leading period (.).
 
     The return parameters contain empty strings for any path-name
     components not found in <path>.
 
     Return Value
 
     None.
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