ft_strtrim.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rakama <rui20030415@gmail.com>             +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/04/12 16:43:22 by rakama            #+#    #+#             */
/*   Updated: 2022/05/13 13:50:01 by rakama           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

size_t	ft_change_s1(char const	*s1, char const	*set, size_t n)
{
	size_t	i;

	i = 0;
	while (set[i] != '\0' && n != 0)
	{
		if (set[i] == s1[n - 1])
		{
			n--;
			i = -1;
		}
		i++;
	}
	return (n);
}

char	*ft_strtrim(char const	*s1, char const	*set)
{
	size_t	n;
	size_t	i;

	i = 0;
	if (s1 == NULL || set == NULL)
		return (NULL);
	while (set[i] != '\0')
	{
		if (*s1 == set[i])
		{
			s1++;
			i = -1;
		}
		i++;
	}
	n = ft_strlen(s1);
	n = ft_change_s1(s1, set, n);
	return (ft_substr(s1, 0, n));
}