function that inserts a new node at a given position.

Author: Technerdguy1

0x13-more_singly_linked_lists/9-insert_nodeint.c

@@ -0,0 +1,49 @@
+#include "lists.h"
+
+/**
+ * insert_nodeint_at_index - insert a new node at a given position
+ * @head: pointer to the head ref
+ * @idx: position to insert node
+ * @n: variable
+ *
+ * Return: the address of the new node, or null if fail
+ */
+
+listint_t *insert_nodeint_at_index(listint_t **head, unsigned int idx, int n)
+{
+listint_t *current;
+listint_t *new;
+
+if (head == NULL)
+return (0);
+new = malloc(sizeof(listint_t));
+if (!new)
+return (0);
+
+new->next = NULL;
+new->n = n;
+
+if (idx == 0)
+{
+new->next = *head;
+(*head) = new;
+return (new);
+}
+
+current = *head;
+
+while (idx != 1)
+{
+current = current->next;
+--idx;
+if (current == NULL)
+{
+free(new);
+return (NULL);
+}
+}
+new->next = current->next;
+current->next = new;
+
+return (new);
+}