add: relay/piface support

models/period.c

@@ -0,0 +1,44 @@
+#include <stdlib.h>
+
+#include <logger.h>
+#include <constants.h>
+#include <models/period.h>
+
+period_t*
+period_create(uint16_t start, uint16_t end)
+{
+    period_t *new_period = malloc(sizeof(period_t));
+    new_period->start = start;
+    new_period->end = end;
+
+    return new_period;
+}
+
+int
+period_includes_time(period_t *period, uint16_t timestamp)
+{
+    uint16_t start = period->start;
+    uint16_t end = period->end;
+
+    // "normal" timespan
+    if(start < end)
+    {
+        if(start <= timestamp && end > timestamp)
+        {
+            return 1;
+        }
+        return 0;
+    }
+
+    // timespan goes through 00:00
+    if(end < start)
+    {
+        if(start >= timestamp && end < timestamp)
+        {
+            return 1;
+        }
+        return 0;
+    }
+
+    return 0;
+}