+char *format_timestamp_us(char *buf, size_t l, usec_t t) {
+ struct tm tm;
+ time_t sec;
+
+ assert(buf);
+ assert(l > 0);
+
+ if (t <= 0 || t == (usec_t) -1)
+ return NULL;
+
+ sec = (time_t) (t / USEC_PER_SEC);
+ localtime_r(&sec, &tm);
+
+ if (strftime(buf, l, "%a %Y-%m-%d %H:%M:%S", &tm) <= 0)
+ return NULL;
+ snprintf(buf + strlen(buf), l - strlen(buf), ".%06llu", t % USEC_PER_SEC);
+ if (strftime(buf + strlen(buf), l - strlen(buf), " %Z", &tm) <= 0)
+ return NULL;
+
+ return buf;
+}
+