Merge "Use mask_eighth_bit function to replace is_ascii check."

    return 0;

}

static int is_ascii(char *line) {

static void mask_eighth_bit(char *line)

{

   for (;;line++) {

        if (*line == 0) return 1;

        if (*line >> 7) return 0;

     if (0 == *line) return;

     *line &= 0x7F;

   }

}

    *bufit = NULL;

    // Simple validation. Must be all ASCII.

    // (we sometimes send non-ASCII UTF-8 in address book, but should

    // never receive non-ASCII UTF-8).

    // This was added because of the BMW 2005 E46 which sends binary junk.

    if (is_ascii(buf)) {

        IF_LOGV() LOG(LOG_VERBOSE, "Bluetooth AT recv", "%s", buf);

    } else {

        LOGW("Ignoring invalid AT command: %s", buf);

        buf[0] = NULL;

    }

    // According to ITU V.250 section 5.1, IA5 7 bit chars are used, 

    //   the eighth bit or higher bits are ignored if they exists

    // We mask out only eighth bit, no higher bit, since we do char

    // string here, not wide char.

    // We added this processing due to 2 real world problems.

    // 1 BMW 2005 E46 which sends binary junk

    // 2 Audi 2010 A3, dial command use 0xAD (soft-hyphen) as number 

    //   formater, which was rejected by the AT handler

    mask_eighth_bit(buf);

    return buf;

}