From bf9914308497839c1d05905f6f156ee4165fdae1 Mon Sep 17 00:00:00 2001
From: Franciszek Malinka <franciszek.malinka@gmail.com>
Date: Mon, 19 Apr 2021 10:18:30 +0200
Subject: Linked list finally working

---
 Semestr 4/sieci/pracownia2/router/config.h      |  2 +-
 Semestr 4/sieci/pracownia2/router/linked_list.c | 25 +++++++++++++++++++++----
 Semestr 4/sieci/pracownia2/router/linked_list.h |  4 ++++
 Semestr 4/sieci/pracownia2/router/makefile      |  9 +++++++++
 Semestr 4/sieci/pracownia2/router/test.c        |  9 ++++++++-
 5 files changed, 43 insertions(+), 6 deletions(-)

diff --git a/Semestr 4/sieci/pracownia2/router/config.h b/Semestr 4/sieci/pracownia2/router/config.h
index abf7d23..3537c03 100644
--- a/Semestr 4/sieci/pracownia2/router/config.h	
+++ b/Semestr 4/sieci/pracownia2/router/config.h	
@@ -2,7 +2,7 @@
 #define CONFIG_H
 
 #define SERVER_PORT 54321
-#define TURN_LEN_S 20
+#define TURN_LEN_S 5
 #define TURN_LEN_MS (1000 * TURN_LEN_S)
 #define TURN_LEN_US (1000000 * TURN_LEN_S)
 
diff --git a/Semestr 4/sieci/pracownia2/router/linked_list.c b/Semestr 4/sieci/pracownia2/router/linked_list.c
index b6b5225..f3bccc9 100644
--- a/Semestr 4/sieci/pracownia2/router/linked_list.c	
+++ b/Semestr 4/sieci/pracownia2/router/linked_list.c	
@@ -16,18 +16,21 @@ void _insert(node_t **head, void *data, size_t data_size) {
   *head = new_node;
 }
 
+void _free_node(node_t *node) {
+  free(node->data);
+  free(node);
+}
+
 void _erase(node_t **head) {
   node_t *next_node = _next(*head);
-  free((*head)->data);
-  free(*head);
+  _free_node(*head);
   *head = next_node;
 }
 
 void _free_list(node_t *head) {
   if (head == NULL) return;
   _free_list(head->next);
-  free(head->data);
-  free(head);
+  _free_node(head);
 }
 
 list_t create_list() {
@@ -45,11 +48,25 @@ void erase(list_t *list) {
   _erase(&list->head);
 }
 
+void erase_it(list_t *list) {
+  if(list->it == NULL) return;
+  if(list->prev_it == NULL) {
+    erase(list);
+    reset(list);
+    return;
+  }
+  list->prev_it->next = _next(list->it);
+  _free_node(list->it);
+  list->it = list->prev_it->next;
+}
+
 void iterate(list_t *list) {
+  list->prev_it = list->it;
   list->it = _next(list->it);
 }
 
 void reset(list_t *list) {
+  list->prev_it = NULL;
   list->it = list->head;
 }
 
diff --git a/Semestr 4/sieci/pracownia2/router/linked_list.h b/Semestr 4/sieci/pracownia2/router/linked_list.h
index f662dbe..28e8ef7 100644
--- a/Semestr 4/sieci/pracownia2/router/linked_list.h	
+++ b/Semestr 4/sieci/pracownia2/router/linked_list.h	
@@ -12,6 +12,7 @@ typedef struct node {
 typedef struct list_t {
   node_t *head;
   node_t *it;
+  node_t *prev_it;
 } list_t;
 
 /* Creates an empty list */
@@ -23,6 +24,9 @@ void insert(list_t *list, void *data, size_t data_size);
 /* Erases first node from the list. */
 void erase(list_t *list);
 
+/* Erases element under iterator and sets iterator to the next one. */
+void erase_it(list_t *list);
+
 /* Moves iterator one step. */
 void iterate(list_t *list);
 
diff --git a/Semestr 4/sieci/pracownia2/router/makefile b/Semestr 4/sieci/pracownia2/router/makefile
index 7d8aaef..87bc15a 100644
--- a/Semestr 4/sieci/pracownia2/router/makefile	
+++ b/Semestr 4/sieci/pracownia2/router/makefile	
@@ -1,13 +1,19 @@
 CC				:= gcc
 CFLAGS 		:= -Og -std=gnu17 -Wall -Wall -fsanitize=address -fsanitize=undefined
 TARGET 		:= router
+TEST 			:= test
 DEPS			:= config.h
 
 ODIR			:= obj
 _OBJ	 		:= router.o utils.o linked_list.o network_addr.o dist_vector.o
 OBJ				:= $(patsubst %,$(ODIR)/%,$(_OBJ))
 
+_TEST_OBJ := test.o linked_list.o
+TEST_OBJ  := $(patsubst %,$(ODIR)/%,$(_TEST_OBJ))
+
+
 all: $(TARGET)
+test: $(TEST)
 
 $(ODIR)/%.o: %.c $(DEPS)
 	$(CC) $(CFLAGS) -c -o $@ $<
@@ -15,6 +21,9 @@ $(ODIR)/%.o: %.c $(DEPS)
 $(TARGET): $(OBJ)
 	$(CC) -o $@ $^ $(CFLAGS)
 
+$(TEST): $(TEST_OBJ)
+	$(CC) -o $@ $^ $(CFLAGS)
+
 clean:
 	rm -rf $(TARGET)
 	rm -rf test
diff --git a/Semestr 4/sieci/pracownia2/router/test.c b/Semestr 4/sieci/pracownia2/router/test.c
index ebc6df1..e086e55 100644
--- a/Semestr 4/sieci/pracownia2/router/test.c	
+++ b/Semestr 4/sieci/pracownia2/router/test.c	
@@ -27,11 +27,18 @@ int main() {
       int val = 0;
       scanf("%d", &val);
       insert(&list, &val, sizeof(int));
+      reset(&list);
     }
     if (t == 1) {
-      erase(&list);
+      iterate(&list);
+      if (list.it != NULL)
+        printf("it: %d\n", *(int *)list.it->data);
+      else printf("End of list.\n");
     }
     if (t == 2) {
+      erase_it(&list);
+    }
+    if (t == 3) {
       print_list(list);
     }
   }
-- 
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