Android开发之，LogCat无故不打印隐藏深坑

int __android_log_buf_write(int bufID, int prio, const char *tag, const char *msg)
{
    struct iovec vec[3];
    char tmp_tag[32];

    if (! tag) tag = "";

    if ((bufID != LOG_ID_RADIO) &&
        (!strcmp(tag, "HTC_RIL") ||
        (!strncmp(tag, "RIL", 3)) ||
        (!strncmp(tag, "IMS", 3)) ||
        !strcmp(tag, "AT") ||
        !strcmp(tag, "GSM") ||
        !strcmp(tag, "STK") ||
        !strcmp(tag, "CDMA") ||
        !strcmp(tag, "PHONE") ||
        !strcmp(tag, "SMS"))) {
            bufID = LOG_ID_RADIO;
            snprintf(tmp_tag, sizeof(tmp_tag), "use-Rlog/RLOG-%s", tag);
            tag  = tmp_tag; 
    }