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     The getcwd function gets the full path name of the current working
     directory and stores it at <buffer>. The _getdcwd function gets
     the full path name plus the disk drive specification.
 
     For _getdcwd, the <drive> argument specifies the drive (0 =
     default drive, 1=A, 2=B, etc.).
 
     The integer argument <maxlen> specifies the maximum length for the
     path name. An error occurs if the length of the path name
     (including the terminating null character) exceeds <maxlen>. The
     constant _MAX_PATH, defined in STDLIB.H, specifies the maximum
     possible path length.
 
     The <buffer> argument can be NULL; a buffer of at least size
     <maxlen> (more only if necessary) will automatically be allocated
     using malloc to store the path name. This buffer can later be
     freed by calling free and passing it the return value of the
     function (a pointer to the allocated buffer).
 
     Return Value
 
     Both the getcwd and _getdcwd functions return the path. A NULL
     return value indicates an error, and errno is set to either ENOMEM
     or ERANGE.
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