Stack iterator

tests/iterators/stack.c

@@ -0,0 +1,39 @@
+// Checks if the stack iterator can go back and forward in the stack without
+// hitting invalid states or a nul pointer. Check is done visually.
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include "../../src/stack.h"
+
+STACK_GENERATE(s, stack, static, , int)
+
+int main(int argc, char const *argv[])
+{
+    size_t i;
+    int r;
+
+    // Initliazie stack and add some elements
+    stack *s = s_new(10);
+    for (int i = 0; i < 10; i++)
+        s_push(s, i);
+
+    // Initialize iterator
+    stack_iter iter;
+    s_iter(&iter, s);
+
+    // Make the iterator go back and forward
+    for (int j = 0; j < 4; j++)
+    {
+        while (s_iter_next(&iter, &r, &i))
+            printf("C[%2d] = %2d\n", i, r);
+        printf("\n");
+        while (s_iter_prev(&iter, &r, &i))
+            printf("C[%2d] = %2d\n", i, r);
+        printf("\n\n");
+    }
+
+    s_free(s);
+
+    return 0;
+}