ft_strnstr.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strnstr.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: unite <marvin@42.fr>                       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/09/04 23:47:47 by unite             #+#    #+#             */
/*   Updated: 2020/07/16 02:42:54 by unite            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "libft.h"
 
char    *ft_strnstr(const char *haystack, const char *needle, size_t len)
{
    size_t  i;
    size_t  j;
 
    i = 0;
    if (*needle == '\0')
        return ((char *)haystack);
    while (haystack[i] && i < len)
    {
        if (haystack[i] == needle[0])
        {
            j = 0;
            while (needle[j] &&
                    i + j < len &&
                    haystack[i + j] == needle[j])
                j++;
            if (needle[j] == 0)
                return ((char *)(haystack + i));
        }
        i++;
    }
    return (NULL);
}