ft_substr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_substr.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tchiba <tchiba@student.42tokyo.jp>         +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/10/16 09:57:42 by tchiba            #+#    #+#             */
/*   Updated: 2020/10/16 10:40:54 by tchiba           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

	if (s == NULL)
		return (NULL);
	len_s = ft_strlen(s);
	if (len_s < start)
	{
		if (!(str = malloc(sizeof(char) * 1)))
			return (NULL);
		str[0] = '\0';
		return (str);
	}
	if (!(str = malloc(sizeof(char) * (len + 1))))
		return (NULL);
	i = 0;
	while (i < len)
	{
		str[i] = s[start + i];
		i++;
	}
	str[i] = '\0';
	return (str);
}