21sh/ft_strnstr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strnstr.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mazimi <mazimi@student.42.fr>              +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2014/11/08 15:26:53 by mazimi            #+#    #+#             */
/*   Updated: 2014/12/08 17:21:39 by mazimi           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strnstr(const char *s1, const char *s2, size_t n)
{
	if (!*s2)
		return ((char *)s1);
	if (!*s1 || n == 0)
		return (NULL);
	if (*s1 == *s2)
		if (ft_strnstr(s1 + 1, s2 + 1, n - 1) - 1 == s1)
			return ((char *)s1);
	return (ft_strnstr(s1 + 1, s2, n - 1));
}