ft_strtrim.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: bhagenlo <bhagenlo@student.42heilbronn.    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/03/28 19:10:41 by bhagenlo          #+#    #+#             */
/*   Updated: 2022/04/08 11:36:03 by bhagenlo         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

char	*ft_strtrim(char const *s, char const *set)
{
	char	*str;
	size_t	i;
	size_t	start;
	size_t	end;

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