ft_strtrim.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: togauthi <togauthi@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/10 13:57:07 by togauthi          #+#    #+#             */
/*   Updated: 2024/10/15 13:48:26 by togauthi         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int	inside(const char c, const char *str)
{
	size_t	i;

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

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

	if (!s1 || !set)
		return (NULL);
	i = 0;
	start = 0;
	while (inside(s1[start], set) && s1[start])
		start++;
	end = ft_strlen(s1);
	while (inside(s1[end - 1], set) && end > start)
		end --;
	trim = malloc(end - start + 1);
	if (!trim)
		return (NULL);
	while (start < end)
	{
		trim[i] = s1[start];
		start++;
		i++;
	}
	trim[i] = '\0';
	return (trim);
}