RATESTR_MAX
static char r2sbuf[R2S_BUFS][RATESTR_MAX]; /* ring buffer */
snprintf(buf, RATESTR_MAX, "%.2f%cb", rate, unit[i]);
snprintf(buf, RATESTR_MAX, "%d%cb", (int)rate, unit[i]);
static char r2sbuf[R2S_BUFS][RATESTR_MAX]; /* ring buffer */
snprintf(buf, RATESTR_MAX, "0");
snprintf(buf, RATESTR_MAX, "%.2fM", rate / 1000000.0);
snprintf(buf, RATESTR_MAX, "%.2fk", rate / 1000.0);