libft/srcs/ft_strnstr.c at main · abdeleb/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strnstr.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: marvin <marvin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/05/19 19:52:33 by marvin            #+#    #+#             */
/*   Updated: 2022/05/19 19:52:35 by marvin           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strnstr(const char *haystack, const char *needle, size_t len)
{
	size_t	h;
	size_t	n;

	h = 0;
	if (needle[0] == '\0')
		return ((char *)haystack);
	while (haystack[h])
	{
		n = 0;
		while (haystack[h + n] == needle[n] && (h + n) < len)
		{
			if (haystack[h + n] == '\0' && needle[n] == '\0')
				return ((char *)&haystack[h]);
			n++;
		}
		if (needle[n] == '\0')
			return ((char *)haystack + h);
		h++;
	}
	return (NULL);
}

/*int main()
{
	const char *largestring = "AAB Bar Baz";
	const char *smallstring = "Bar";
	char *ptr;

	ptr = ft_strnstr(largestring, smallstring, 7);

	printf("%s", ptr);

	return 0;
}*/