ft_strtrim.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ysaito <ysaito@student.42tokyo.jp>         +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/06/29 00:23:02 by ysaito            #+#    #+#             */
/*   Updated: 2021/11/01 20:58:07 by ysaito           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static size_t	judge_trim(char c, char const *set)
{
	while (*set)
	{
		if (c == *set)
			return (1);
		set++;
	}
	return (0);
}

char	*ft_strtrim(char const *s1, char const *set)
{
	int	start;
	int	end;

	if (s1 == NULL || set == NULL)
		return (NULL);
	start = 0;
	while (s1[start] != '\0' && judge_trim(s1[start], set))
		start++;
	end = ft_strlen(s1);
	while (end > start && judge_trim(s1[end - 1], set))
		end--;
	return (ft_substr((char *)s1, start, end - start));
}