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ft_lstnew.c
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ft_lstnew.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_lstnew.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: pbie <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2015/12/01 16:41:20 by pbie #+# #+# */
/* Updated: 2015/12/02 18:17:52 by pbie ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
/*We will be allocating memory for, and returning, a "fresh" linked list. The
* elements content and content_size within our new link will be copied from the
* parameters of the function. If the parameter content is NULL the the element
* content_size is initialized to 0 regardless of the paramter of content_size.
* The element of next is initialized to NULL. If the memory allocation fails
* then we will return NULL*/
t_list *ft_lstnew(void const *content, size_t content_size)
{
/*We first declare a new t_list structure called 'new'*/
t_list *new;
/*We then proceed to allocate the memory required for the stucture to exist*/
new = (t_list *)malloc(sizeof(t_list) * 1);
/*In the event that the memory allocation failed we return NULL*/
if (new == NULL)
return (NULL);
/*If the parameter of content is NULL we set the content element to NULL
* and the content_size element to 0 regardless of the parameter given*/
if (content == NULL)
{
new->content = NULL;
new->content_size = 0;
}
/*If the above is not the case we move on. We allocate memory for our new
* linked list's element content by using our parameter of content_size.
* If the allocation fails for this we return NULL. If it works we use our
* ft_memmove function to move the data from our parameters into our linked
* new's content element. And last we set our link new's content_size to
* our parameter content_size*/
else
{
new->content = malloc(content_size);
if (new->content == NULL)
return (NULL);
ft_memmove(new->content, content, content_size);
new->content_size = content_size;
}
/*Last we set our new link list new's next element to NULL so that we know
* that we are at the end of the list. We then return our new link.*/
new->next = NULL;
return (new);
}