ft_strtrim.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mohaben- <mohaben-@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/24 11:22:46 by mohaben-          #+#    #+#             */
/*   Updated: 2024/10/29 17:52:47 by mohaben-         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

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

	if (s1 == NULL)
		return (NULL);
	if (set == NULL)
		return (ft_strdup(s1));
	start = 0;
	end = ft_strlen(s1) - 1;
	while (check_set(s1[start], set) == 1)
		start++;
	if (start == ft_strlen(s1))
		return (ft_strdup(""));
	while (check_set(s1[end], set) == 1)
		end--;
	return (ft_substr(s1, start, end - start + 1));
}