Iterator fixes and tests

tests/iterators/linkedlist.c

@@ -33,6 +33,20 @@ int main(int argc, char const *argv[])
         printf("\n\n");
     }
 
+    for (ll_iter_tostart(&iter); !ll_iter_end(&iter); /**/)
+    {
+        ll_iter_next(&iter, &r, &i);
+        printf("LL[%2d] = %2d\n", i, r);
+    }
+
+    printf("\n");
+
+    for (ll_iter_toend(&iter); !ll_iter_start(&iter); /**/)
+    {
+        ll_iter_prev(&iter, &r, &i);
+        printf("LL[%2d] = %2d\n", i, r);
+    }
+
     ll_free(ll);
 
     return 0;

tests/iterators/list.c

@@ -1,5 +1,5 @@
 // Checks if the list iterator can go back and forward in the list without
-// hitting invalid states or a nul pointer. Check is done visually.
+// hitting invalid states or a null pointer. Check is done visually.
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
@@ -33,6 +33,20 @@ int main(int argc, char const *argv[])
         printf("\n\n");
     }
 
+    for (l_iter_tostart(&iter); !l_iter_end(&iter); /**/)
+    {
+        l_iter_next(&iter, &r, &i);
+        printf("L[%2d] = %2d\n", i, r);
+    }
+
+    printf("\n");
+
+    for (l_iter_toend(&iter); !l_iter_start(&iter); /**/)
+    {
+        l_iter_prev(&iter, &r, &i);
+        printf("L[%2d] = %2d\n", i, r);
+    }
+
     l_free(l);
 
     return 0;

tests/iterators/stack.c

@@ -1,5 +1,5 @@
 // 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.
+// hitting invalid states or a null pointer. Check is done visually.
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
@@ -33,6 +33,20 @@ int main(int argc, char const *argv[])
         printf("\n\n");
     }
 
+    for (s_iter_tostart(&iter); !s_iter_end(&iter); /**/)
+    {
+        s_iter_next(&iter, &r, &i);
+        printf("S[%2d] = %2d\n", i, r);
+    }
+
+    printf("\n");
+
+    for (s_iter_toend(&iter); !s_iter_start(&iter); /**/)
+    {
+        s_iter_prev(&iter, &r, &i);
+        printf("S[%2d] = %2d\n", i, r);
+    }
+
     s_free(s);
 
     return 0;