From 0d650b413a907f0fd4e78ee1500c196e9fd41d9f Mon Sep 17 00:00:00 2001
From: =?utf8?q?J=C3=A9r=C3=B4me=20Benoit?= <jerome.benoit@piment-noir.org>
Date: Wed, 1 Mar 2017 19:52:17 +0100
Subject: [PATCH] TP 9 exo2: Add list_insert and list_delete linked list
 helpers functions.
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Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org>
---
 TP_9/exo2/clist.c | 41 +++++++++++++++++++++++++++++++++++++++++
 TP_9/exo2/clist.h |  2 ++
 TP_9/exo2/exo2.c  | 10 ++++++++++
 3 files changed, 53 insertions(+)

diff --git a/TP_9/exo2/clist.c b/TP_9/exo2/clist.c
index 0ee532f..0aa9e37 100644
--- a/TP_9/exo2/clist.c
+++ b/TP_9/exo2/clist.c
@@ -31,6 +31,47 @@ link_t* list_prepend(link_t* head, int value) {
     return first_link;
 }
 
+link_t* list_insert(link_t* head, unsigned index, int value) {
+    link_t* link_insrt = list_new(value);  
+    link_t* head_first = head;
+    //link_t* head_prev = NULL;
+    link_t* head_next = NULL;
+
+    for (unsigned i = 0; i < index; i++) {
+        head = head->next;
+    }
+    //head_prev = head;
+    head->next = link_insrt;
+    head_next = head->next;
+    head = link_insrt;
+    head->next = head_next; 
+    return head_first;
+}
+
+link_t* list_delete(link_t* head, unsigned index) {
+    link_t* head_first = head;
+    link_t* head_prev = NULL;
+    link_t* head_next = NULL;
+   
+    if (index == 0) {
+        head_next = head->next;
+        free(head);
+        head = head_next;
+        return head;
+    } else {
+        for (unsigned i = 0; i < index-1; i++) {
+            head = head->next;
+        }
+        head_prev = head;
+        head = head->next;
+        head_next = head->next;
+        free(head);
+        head = head_prev;
+        head->next = head_next;
+        return head_first;
+    }
+}
+
 unsigned list_count(link_t* head) {
     int count = 0;
     
diff --git a/TP_9/exo2/clist.h b/TP_9/exo2/clist.h
index ec1c13a..40eaef1 100644
--- a/TP_9/exo2/clist.h
+++ b/TP_9/exo2/clist.h
@@ -10,6 +10,8 @@ typedef struct link_s {
 link_t* list_new(int value); 
 link_t* list_append(link_t* head, int value); 
 link_t* list_prepend(link_t* head, int value); 
+link_t* list_insert(link_t* head, unsigned index, int value);
+link_t* list_delete(link_t* head, unsigned index);
 unsigned list_count(link_t* head);
 void list_set(link_t* head, unsigned index, int value);
 int list_get(link_t* head, unsigned index);
diff --git a/TP_9/exo2/exo2.c b/TP_9/exo2/exo2.c
index 15172ce..ff5912b 100644
--- a/TP_9/exo2/exo2.c
+++ b/TP_9/exo2/exo2.c
@@ -20,6 +20,16 @@ int main() {
     printf("Valeur a index %d: %d\n", 4, list_get(head, 4));
     list_set(head, 0, 78);
     printf("Valeur a index %d: %d\n", 0, list_get(head, 0));
+    printf("Valeur a index %d: %d\n", 1, list_get(head, 1));
+    printf("Valeur a index %d: %d\n", 2, list_get(head, 2));
+    head = list_insert(head, 2, 7);
+    printf("Valeur a index %d: %d\n", 1, list_get(head, 1));
+    printf("Valeur a index %d: %d\n", 2, list_get(head, 2));
+    printf("Valeur a index %d: %d\n", 3, list_get(head, 3));
+    //head = list_delete(head, 2);
+    printf("Valeur a index %d: %d\n", 2, list_get(head, 2));
+    printf("Valeur a index %d: %d\n", 3, list_get(head, 3));
+    printf("Valeur a index %d: %d\n", 4, list_get(head, 4));
     list_clear(head);
 
     return 0;
-- 
2.34.1