Library /sys$common/syshlp/helplib.hlb  —  CRTL  wcsrtombs  Return Values
    x                  The number of bytes stored in the resulting
                       array, not including the terminating null (if
                       any).
    -1                 Indicates an encoding error-a character that
                       does not correspond to a valid multibyte
                       character was encountered; errno is set to
                       EILSEQ; the conversion state is undefined.
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