42_libft/ft_strnstr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strnstr.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cchauvet <cchauvet@student.42angoulem      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/09/26 13:39:33 by cchauvet          #+#    #+#             */
/*   Updated: 2022/09/29 21:10:21 by cchauvet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strnstr(const char *big, const char *little, size_t len)
{
	size_t	i;
	size_t	j;

	if (!*little || (little == big && ft_strlen(little) <= len))
		return ((char *) big);
	i = 0;
	while (i < len && big[i])
	{
		j = 0;
		while (big[i + j] == little[j] && i + j < len)
		{
			if (!little[j + 1])
				return ((char *) big + i);
			j++;
		}
		i++;
	}
	return (NULL);
}