LIBFT_42/ft_strnstr.c at main · Aztaban/LIBFT_42 · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strnstr.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mjusta <mjusta@student.42prague.com>       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/05/25 19:52:40 by mjusta            #+#    #+#             */
/*   Updated: 2025/05/28 14:31:50 by mjusta           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

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