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Chains_across_the_Island/Fundamentals/double/double.c

@@ -1,26 +1,127 @@
 #include "double.h"
+#include <stddef.h>
+#include <stdlib.h>
+#include <stdio.h>
 
 struct dlist *dlist_append(struct dlist *l, int e)
 {
-    //FIXME
+    struct dlist *new_node = calloc(1, sizeof(struct dlist));
+    if(!new_node) return NULL;
+
+    new_node->prev = NULL;
+    new_node->next = l;
+    new_node->data = e;
+    l->prev = new_node;
+
+    return new_node;
+
 }
 
 int dlist_insert(struct dlist **l, size_t index, int e)
 {
-    //FIXME
+    struct dlist *tmp = *l;
+
+    if(index == 0){ 
+        dlist_append(*l, e);
+        return 0;
+    }
+
+    size_t ind = 0;
+    while(tmp != NULL && ind < index - 1){
+
+        tmp = tmp->next;
+        ind ++;
+    }
+
+    if(!tmp) return 1;
+
+    struct dlist *new_node = malloc(sizeof(struct dlist));
+    if(!new_node) return 1;
+
+    new_node->data = e;
+    new_node->next = tmp;
+    tmp->prev->next = new_node;
+    new_node->prev = tmp->prev;
+    tmp->prev = new_node;
+
+    return 0;
+
+
 }
 
 struct dlist *dlist_delete_at(struct dlist **l, size_t index)
 {
-    //FIXME
+    if(!l || *l) return NULL;
+
+
+    struct dlist *old = *l;
+    if(index == 0){
+
+        old->next->prev = NULL;
+        *l = old->next;
+        return old;
+    }
+
+    struct dlist *tmp = *l;
+    size_t ind = 0;
+    while(tmp != NULL && ind < index -1){
+        
+        tmp = tmp->next;
+        ind ++;
+    }
+
+    if(ind == index -1){
+
+        old = tmp->next;
+        tmp->prev = old->prev;
+        tmp->next = old->next;
+        return old;
+    }
+    return NULL;
 }
 
 int dlist_remove(struct dlist **l, int e)
 {
-    //FIXME
+    struct dlist *old = NULL;
+    struct dlist *tmp = *l;
+
+    while(tmp != NULL && tmp->data != e){
+
+        old = tmp;
+        tmp = tmp->next;
+    }
+
+    if(!tmp) return 0;
+
+    if(!old){
+
+        *l = tmp->next;
+    }
+    else {
+
+        old->next = tmp->next;
+        old->prev = tmp->prev;
+    }
+
+    free(tmp);
+
+    return 1;
 }
 
 void dlist_print(struct dlist *l)
 {
-    //FIXME
+    
+    struct dlist *tmp = l;
+
+    while (tmp != NULL){
+
+        printf("%i", tmp->data);
+
+        if (tmp->next != NULL) printf(" <-> ");
+
+        tmp = tmp->next;
+    }
+
+    printf("\n");
+
 }