+/*
+ * Determines whether remaining bytes are below given threshold.
+ *
+ */
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__)
+static bool below_threshold(struct statfs buf, const char *prefix_type, const char *threshold_type, const double low_threshold) {
+#else
+static bool below_threshold(struct statvfs buf, const char *prefix_type, const char *threshold_type, const double low_threshold) {
+#endif
+ if (strcasecmp(threshold_type, "percentage_free") == 0) {
+ return 100.0 * (double)buf.f_bfree / (double)buf.f_blocks < low_threshold;
+ } else if (strcasecmp(threshold_type, "percentage_avail") == 0) {
+ return 100.0 * (double)buf.f_bavail / (double)buf.f_blocks < low_threshold;
+ } else if (strcasecmp(threshold_type, "bytes_free") == 0) {
+ return (double)buf.f_bsize * (double)buf.f_bfree < low_threshold;
+ } else if (strcasecmp(threshold_type, "bytes_avail") == 0) {
+ return (double)buf.f_bsize * (double)buf.f_bavail < low_threshold;
+ } else if (threshold_type[0] != '\0' && strncasecmp(threshold_type+1, "bytes_", strlen("bytes_")) == 0) {
+ uint64_t base = strcasecmp(prefix_type, "decimal") == 0 ? DECIMAL_BASE : BINARY_BASE;
+ double factor = 1;
+
+ switch (threshold_type[0]) {
+ case 'T':
+ case 't':
+ factor *= base;
+ case 'G':
+ case 'g':
+ factor *= base;
+ case 'M':
+ case 'm':
+ factor *= base;
+ case 'K':
+ case 'k':
+ factor *= base;
+ break;
+ default:
+ return false;
+ }
+
+ if (strcasecmp(threshold_type+1, "bytes_free") == 0) {
+ return (double)buf.f_bsize * (double)buf.f_bfree < low_threshold * factor;
+ } else if (strcasecmp(threshold_type+1, "bytes_avail") == 0) {
+ return (double)buf.f_bsize * (double)buf.f_bavail < low_threshold * factor;
+ }
+ }
+
+ return false;
+}
+