1 files changed, 94 insertions, 0 deletions
diff --git a/web/api/formatters/value/value.c b/web/api/formatters/value/value.c
new file mode 100644
index 0000000..aea6c16
--- /dev/null
+++ b/web/api/formatters/value/value.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "value.h"
+
+
+inline calculated_number rrdr2value(RRDR *r, long i, RRDR_OPTIONS options, int *all_values_are_null) {
+    rrdset_check_rdlock(r->st);
+
+    long c;
+    RRDDIM *d;
+
+    calculated_number *cn = &r->v[ i * r->d ];
+    RRDR_VALUE_FLAGS *co = &r->o[ i * r->d ];
+
+    calculated_number sum = 0, min = 0, max = 0, v;
+    int all_null = 1, init = 1;
+
+    calculated_number total = 1;
+    int set_min_max = 0;
+    if(unlikely(options & RRDR_OPTION_PERCENTAGE)) {
+        total = 0;
+        for(c = 0, d = r->st->dimensions; d && c < r->d ;c++, d = d->next) {
+            calculated_number n = cn[c];
+
+            if(likely((options & RRDR_OPTION_ABSOLUTE) && n < 0))
+                n = -n;
+
+            total += n;
+        }
+        // prevent a division by zero
+        if(total == 0) total = 1;
+        set_min_max = 1;
+    }
+
+    // for each dimension
+    for(c = 0, d = r->st->dimensions; d && c < r->d ;c++, d = d->next) {
+        if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
+        if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_DIMENSION_NONZERO))) continue;
+
+        calculated_number n = cn[c];
+
+        if(likely((options & RRDR_OPTION_ABSOLUTE) && n < 0))
+            n = -n;
+
+        if(unlikely(options & RRDR_OPTION_PERCENTAGE)) {
+            n = n * 100 / total;
+
+            if(unlikely(set_min_max)) {
+                r->min = r->max = n;
+                set_min_max = 0;
+            }
+
+            if(n < r->min) r->min = n;
+            if(n > r->max) r->max = n;
+        }
+
+        if(unlikely(init)) {
+            if(n > 0) {
+                min = 0;
+                max = n;
+            }
+            else {
+                min = n;
+                max = 0;
+            }
+            init = 0;
+        }
+
+        if(likely(!(co[c] & RRDR_VALUE_EMPTY))) {
+            all_null = 0;
+            sum += n;
+        }
+
+        if(n < min) min = n;
+        if(n > max) max = n;
+    }
+
+    if(unlikely(all_null)) {
+        if(likely(all_values_are_null))
+            *all_values_are_null = 1;
+        return 0;
+    }
+    else {
+        if(likely(all_values_are_null))
+            *all_values_are_null = 0;
+    }
+
+    if(options & RRDR_OPTION_MIN2MAX)
+        v = max - min;
+    else
+        v = sum;
+
+    return v;
+}