ft_strtrim.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: sel-mlil <sel-mlil@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/26 18:42:08 by sel-mlil          #+#    #+#             */
/*   Updated: 2024/10/28 06:02:16 by sel-mlil         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int	check(char c, char *set)
{
	int	i;

	i = 0;
	while (set[i])
	{
		if (set[i] == c)
			return (1);
		i++;
	}
	return (0);
}

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

	start = 0;
	if (!s1)
		return (NULL);
	if (!*s1)
		return (ft_strdup(""));
	while (s1[start] && check(s1[start], (char *)set) == 1)
		start++;
	end = ft_strlen(s1) - 1;
	while (s1[end] && check(s1[end], (char *)set) == 1)
		end--;
	if (start > end)
		return (ft_strdup(""));
	return (ft_substr(s1, start, end - start + 1));
}