NILVALUE
(void)fputs(NILVALUE " ", fp);
hostname[0] == '\0' ? NILVALUE : hostname);
(void)fprintf(fp, "%s ", LogTag == NULL ? NILVALUE : LogTag);
(void)fputs(NILVALUE " ", fp);
(void)fputs(NILVALUE " ", fp);
static const char NILVALUE[] = {"-"}; /* RFC5424 specified NILVALUE */
if (bufsize < sizeof(NILVALUE)) {
strlcpy(timebuf, NILVALUE, bufsize);
strlcpy(timebuf, NILVALUE, bufsize);