ft_strstr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strstr.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: lboukrou <lboukrou@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2017/12/12 16:19:10 by lboukrou          #+#    #+#             */
/*   Updated: 2017/12/13 15:44:34 by lboukrou         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strstr(const char *haystack, const char *needle)
{
	size_t	i;
	size_t	j;
	size_t	k;

	i = 0;
	j = 0;
	k = 0;
	if (*needle == 0)
		return (char*)(haystack);
	while (haystack[k])
	{
		while (haystack[i])
		{
			j = haystack[i] == needle[j] ? j + 1 : 0;
			if (ft_strlen(needle) == j)
				return (char*)(haystack + (i - j + 1));
			i++;
		}
		j = 0;
		k++;
		i = k;
	}
	return (NULL);
}