KICONV_UTF8_REPLACEMENT_CHAR2
*ob++ = KICONV_UTF8_REPLACEMENT_CHAR2;
*ob++ = KICONV_UTF8_REPLACEMENT_CHAR2;
*ob++ = KICONV_UTF8_REPLACEMENT_CHAR2;
*ob++ = KICONV_UTF8_REPLACEMENT_CHAR2;
*ob++ = KICONV_UTF8_REPLACEMENT_CHAR2;
u8[1] == KICONV_UTF8_REPLACEMENT_CHAR2 &&
*ob++ = KICONV_UTF8_REPLACEMENT_CHAR2;
*ob++ = KICONV_UTF8_REPLACEMENT_CHAR2;