1 files changed, 57 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..73cf9fa
--- /dev/null
+++ b/web/api/queries/max/max.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "max.h"
+
+// ----------------------------------------------------------------------------
+// max
+
+struct grouping_max {
+    NETDATA_DOUBLE max;
+    size_t count;
+};
+
+void grouping_create_max(RRDR *r, const char *options __maybe_unused) {
+    r->internal.grouping_data = onewayalloc_callocz(r->internal.owa, 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) {
+    onewayalloc_freez(r->internal.owa, r->internal.grouping_data);
+    r->internal.grouping_data = NULL;
+}
+
+void grouping_add_max(RRDR *r, NETDATA_DOUBLE value) {
+    struct grouping_max *g = (struct grouping_max *)r->internal.grouping_data;
+
+    if(!g->count || fabsndd(value) > fabsndd(g->max)) {
+        g->max = value;
+        g->count++;
+    }
+}
+
+NETDATA_DOUBLE grouping_flush_max(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct grouping_max *g = (struct grouping_max *)r->internal.grouping_data;
+
+    NETDATA_DOUBLE 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;
+}
+