Start to rewriting code

Since there's some UB in the master I decided to rewrite code from
scratch again. I hope that attempt will be better :D

1 files changed, 22 insertions, 0 deletions

diff --git a/src/stack.c b/src/stack.c
new file mode 100644
index 0000000..3a1f697
--- /dev/null
+++ b/src/stack.c
@@ -0,0 +1,22 @@
+#include "3cl.h"
+
+#include <stdlib.h>
+
+
+static inline void resize(struct CCLStack *stack)
+{
+    stack->length *= 2;
+    stack->stack = realloc(stack->stack, stack->length * sizeof(*stack->stack));
+}
+
+void ccl_stack_push(struct CCLStack *stack, CCLNum num)
+{
+    if (stack->cur + 1 == stack->length)
+        resize(stack);
+    stack->stack[++stack->cur] = num;
+}
+
+CCLNum ccl_stack_pop(struct CCLStack *stack, CCLNum num)
+{
+    return stack->stack[stack->cur--];
+}