1 files changed, 38 insertions, 0 deletions
diff --git a/rushs/evalexpr/traffic_lights/traffic_lights.c b/rushs/evalexpr/traffic_lights/traffic_lights.c
new file mode 100644
index 0000000..76ea94f
--- /dev/null
+++ b/rushs/evalexpr/traffic_lights/traffic_lights.c
@@ -0,0 +1,38 @@
+#include "traffic_lights.h"
+
+void init(unsigned char *lights)
+{
+    *lights <<= 4;
+}
+
+void turn_on(unsigned char *lights, unsigned char light_num)
+{
+    *lights |= 1 << (light_num - 1);
+}
+
+void turn_off(unsigned char *lights, unsigned char light_num)
+{
+    *lights &= ~(1 << (light_num - 1));
+}
+
+void next_step(unsigned char *lights)
+{
+    *lights <<= 1;
+    *lights += *lights >> 4;
+}
+
+void reverse(unsigned char *lights)
+{
+    *lights = ~*lights;
+}
+
+void swap(unsigned char *lights_1, unsigned char *lights_2)
+{
+    if (lights_1 == lights_2)
+    {
+        return;
+    }
+    *lights_1 = *lights_2 ^ *lights_1;
+    *lights_2 = *lights_1 ^ *lights_2;
+    *lights_1 = *lights_2 ^ *lights_1;
+}