HELPLIB.HLB  —  CRTL  ctermid  Argument
 str

    Must be a pointer to an array of characters. If this argument is
    NULL, the filename is stored internally and might be overwritten
    by the next ctermid call. Otherwise, the filename is stored
    beginning at the location indicated by the argument. The argument
    must point to a storage area of length L_ctermid (defined by the
    <stdio.h> header file).
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