SFF_VENDOR_STRING_SIZE
read_i2c(ii, addr, off, SFF_VENDOR_STRING_SIZE, dst);
dst += SFF_VENDOR_STRING_SIZE;
char name[SFF_VENDOR_STRING_SIZE + 1]; /**< vendor name */
char pn[SFF_VENDOR_STRING_SIZE + 1]; /**< vendor part number */
char sn[SFF_VENDOR_STRING_SIZE + 1]; /**< vendor serial number */