libft/ft_strnstr.c at main · Ramix76/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strnstr.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: framos-p <framos-p@student.42barcel>       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/05/18 12:17:10 by framos-p          #+#    #+#             */
/*   Updated: 2022/05/21 13:09:28 by framos-p         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strnstr(const char *haystack, const char *needle, size_t len)
{
	size_t	i;
	size_t	ln;

	if (needle[0] == '\0')
		return ((char *)haystack);
	while (*haystack != '\0' && len > 0)
	{
		i = 0;
		ln = len + 1;
		while (haystack[i] == needle[i] && needle[i] != '\0' && --ln > 0)
				i++;
		if (needle[i] == '\0')
			return ((char *)haystack);
		haystack++;
		len--;
	}
	return (NULL);
}