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     The _dos_findfirst routine uses system call INT 0x4E to return
     information about the first instance of a file whose name and
     attributes match the <filename> and <attributes> arguments.
     Information is returned in a find_t structure, defined in DOS.H.
 
     The filename argument may use wild cards (* and ?). The
     <attributes> argument can be any of the following manifest
     constants:
 
     _A_ARCH       _A_RDONLY     _A_SYSTEM
     _A_HIDDEN     _A_SUBDIR     _A_VOLID
     _A_NORMAL
 
     Multiple constants can be combined (with the OR operator) by using
     the vertical-bar (|) character.
 
     The _dos_findnext routine uses system call INT 0x4F to find the
     next name, if any, that matches the <filename> and <attributes>
     arguments specified in a prior call to _dos_findfirst. The
     <fileinfo> argument must point to a structure initialized by a
     previous call to _dos_findfirst. As described above, the contents
     of the structure will be altered if a match is found.
 
     If the <attributes> argument to either of these functions is
     _A_HIDDEN, _A_RDONLY, _A_SUBDIR, or _A_SYSTEM, the function also
     returns any normal attribute files that match the <filename>
     argument. That is, a normal file does not have a read-only,
     hidden, system, or directory attribute.
 
     Do not alter the contents of the buffer between a call to
     _dos_findfirst and a subsequent call to the _dos_findnext
     function. Also, the buffer should not be altered between calls to
     _dos_findnext.
 
     The formats for the wr_time and wr_date elements are in DOS format
     and are not usable by any other C run-time function.
 
     See: ◄DOS Time/Date Format►
 
     Return Value
 
     If successful, both functions return 0. Otherwise, they return the
     DOS error code and set errno to ENOENT, indicating that the
     <filename> could not be matched.
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