ft_strtrim.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tauer <tauer@student.42.fr>                +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/11/06 15:44:50 by tauer             #+#    #+#             */
/*   Updated: 2023/11/06 15:44:50 by tauer            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int	is_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)
{
	char	*str;
	size_t	start;
	size_t	end;
	size_t	i;

	if (!s1)
		return (NULL);
	start = 0;
	end = ft_strlen(s1);
	i = 0;
	while (s1[start] && is_set(s1[start], set) == 1)
		start++;
	while (end > start && is_set(s1[end - 1], set) == 1)
		end--;
	str = (char *)malloc(sizeof(char) * (end - start + 1));
	if (!str)
		return (NULL);
	while (start < end)
		str[i++] = s1[start++];
	str[i] = '\0';
	return (str);
}