libft/ft_substr.c at master · steffenparth/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_substr.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: sparth <sparth@student.42heilbronn.de>     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/10/11 10:47:56 by sparth            #+#    #+#             */
/*   Updated: 2023/10/20 11:54:12 by sparth           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_substr(char const *s, unsigned int start, size_t len)
{
	char	*substring;
	size_t	i;
	size_t	j;

	i = 0;
	j = 0;
	if (len > ft_strlen(s) - start)
		len = ft_strlen(s) - start;
	if (start >= ft_strlen(s))
		return (ft_strdup(""));
	substring = malloc((len + 1) * sizeof(char));
	if (!s || !substring)
		return (NULL);
	while (s[i])
	{
		if (i >= start && j < len)
		{
			substring[j] = s[i];
			j++;
		}
		i++;
	}
	substring[j] = '\0';
	return (substring);
}

// #include <stdio.h>
// int main ()
// {
// 	char	string [] = "Hello world";
// 	printf("%s\n", ft_substr(string, 15, 3));
// 	return (0);
// }