+static gauge_t calculate_ratio_percent(derive_t part, derive_t total,
+ derive_t *prev_part,
+ derive_t *prev_total) {
+ if ((*prev_part == 0) || (*prev_total == 0) || (part < *prev_part) ||
+ (total < *prev_total)) {
+ *prev_part = part;
+ *prev_total = total;
+ return NAN;
+ }
+
+ derive_t num = part - *prev_part;
+ derive_t denom = total - *prev_total;
+
+ *prev_part = part;
+ *prev_total = total;
+
+ if (denom == 0)
+ return NAN;
+
+ if (num == 0)
+ return 0;
+
+ return 100.0 * (gauge_t)num / (gauge_t)denom;
+}
+
+static gauge_t calculate_ratio_percent2(derive_t part1, derive_t part2,
+ derive_t *prev1, derive_t *prev2) {
+ if ((*prev1 == 0) || (*prev2 == 0) || (part1 < *prev1) || (part2 < *prev2)) {
+ *prev1 = part1;
+ *prev2 = part2;
+ return NAN;
+ }
+
+ derive_t num = part1 - *prev1;
+ derive_t denom = part2 - *prev2 + num;
+
+ *prev1 = part1;
+ *prev2 = part2;
+
+ if (denom == 0)
+ return NAN;
+
+ if (num == 0)
+ return 0;
+
+ return 100.0 * (gauge_t)num / (gauge_t)denom;
+}
+