HELPLIB.HLB  —  CRTL  mblen  Return Values
    x                  The number of bytes that comprise the
                       multibyte character, if the next n or fewer
                       bytes form a valid character.
    0                  If s is NULL or a pointer to the NULL
                       character.
    -1                 Indicates an error. The function sets errno to
                       EILSEQ - Invalid character detected.
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