ft_strtrim.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: aabda <aabda@student.s19.be>               +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/07/18 16:50:34 by aabda             #+#    #+#             */
/*   Updated: 2022/07/18 18:03:50 by aabda            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

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

	if (!s1 || !set)
		return (NULL);
	start = 0;
	end = ft_strlen(s1) - 1;
	while (check_ismatch(s1[start], set) == 1)
		start++;
	if (start - 1 == end)
	{
		str = malloc(sizeof(char));
		if (!str)
			return (NULL);
		str[0] = '\0';
		return (str);
	}
	while (check_ismatch(s1[end], set) == 1)
		end--;
	str = ft_substr(s1, start, (end - start) + 1);
	return (str);
}