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-rw-r--r--web/api/queries/max/max.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/web/api/queries/max/max.c b/web/api/queries/max/max.c
new file mode 100644
index 0000000..a4be36a
--- /dev/null
+++ b/web/api/queries/max/max.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "max.h"
+
+// ----------------------------------------------------------------------------
+// max
+
+struct grouping_max {
+ calculated_number max;
+ size_t count;
+};
+
+void *grouping_create_max(RRDR *r) {
+ (void)r;
+ return callocz(1, sizeof(struct grouping_max));
+}
+
+// resets when switches dimensions
+// so, clear everything to restart
+void grouping_reset_max(RRDR *r) {
+ struct grouping_max *g = (struct grouping_max *)r->internal.grouping_data;
+ g->max = 0;
+ g->count = 0;
+}
+
+void grouping_free_max(RRDR *r) {
+ freez(r->internal.grouping_data);
+ r->internal.grouping_data = NULL;
+}
+
+void grouping_add_max(RRDR *r, calculated_number value) {
+ if(!isnan(value)) {
+ struct grouping_max *g = (struct grouping_max *)r->internal.grouping_data;
+
+ if(!g->count || calculated_number_fabs(value) > calculated_number_fabs(g->max)) {
+ g->max = value;
+ g->count++;
+ }
+ }
+}
+
+calculated_number grouping_flush_max(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+ struct grouping_max *g = (struct grouping_max *)r->internal.grouping_data;
+
+ calculated_number value;
+
+ if(unlikely(!g->count)) {
+ value = 0.0;
+ *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+ }
+ else {
+ value = g->max;
+ }
+
+ g->max = 0.0;
+ g->count = 0;
+
+ return value;
+}
+