Makefile

@@ -1,7 +1,11 @@
-CC=clang
+CC ?= clang
+CFLAGS ?=
 
 all:
-	$(CC) -o lbr -O2 -Wall -Wextra -Wpedantic src/*.c
+	$(CC) -o lbr -O2 -Wall -Wextra -Wpedantic $(CFLAGS) src/*.c
+
+clean:
+	rm lbr
 
 test:
-	./lbr tests/test.lb
+	./lbr tests/test.lb

src/execute.c

@@ -532,11 +532,7 @@ void execute(Stack *stack, Stack *originstack, char *modname)
 
         if (!strcmp(NAME, "size"))
         {
-            int i = 0;
+            stack_push(stack, stack->pointer);
-            while (i < stack->pointer)
-                i++;
-
-            stack_push(stack, i);
             continue;
         }
 

tests/native_test.c

@@ -0,0 +1,14 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+// Build with
+// cc -shared -fPIC native_test.c -o native_test.so
+// or
+// cc -shared -fPIC native_test.c -o native_test.dll
+
+int labashka(unsigned short (*pop)(void), void (*push)(unsigned short), size_t (*len)(void), size_t max_size ) {
+    printf("At %zu, there's %d.\n", len(), pop());
+    push(12);
+    printf("Maximum size is %zu.\n", max_size);
+    return 0;   
+}

tests/native_test.lb

@@ -0,0 +1,3 @@
+@ 0
+ push -1
+ #native native_test