libft/ft_strnstr.c at master · sekak/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strnstr.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: asekkak <asekkak@student.42.fr>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/03 12:19:50 by asekkak           #+#    #+#             */
/*   Updated: 2022/10/18 11:32:59 by asekkak          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

	i = 0;
	j = 0;
	if (len == 0 && !haystack)
		return (0);
	if (*needle == '\0')
		return ((char *)&haystack[i]);
	while (haystack[i] && i < len)
	{
		j = 0;
		if (haystack[i] == needle[j])
		{
			while (haystack[i + j] == needle[j] && (i + j) < len)
			{
				j++;
				if (needle[j] == '\0')
					return ((char *)&haystack[i]);
			}
		}
		i++;
	}
	return (0);
}