ft_substr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_substr.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: youkim <youkim@student.42seoul.kr>         +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/05/09 18:48:38 by youkim            #+#    #+#             */
/*   Updated: 2021/05/12 14:20:08 by youkim           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static size_t	st_min(size_t first, size_t last)
{
	if (first >= last)
		return (last);
	return (first);
}

char			*ft_substr(char const *s, unsigned int start, size_t len)
{
	char	*sub;

	if (!s)
		return (0);
	if (ft_strlen(s) < start)
		return (ft_strdup(""));
	len = st_min(len, ft_strlen(s + start));
	sub = malloc((len + 1) * sizeof(char));
	if (!sub)
		return (0);
	ft_strlcpy(sub, s + start, len + 1);
	return (sub);
}