Libft/ft_strtrim.c at main · M677871/Libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: marvin <marvin@student.42.fr>              +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/11/10 09:31:39 by marvin            #+#    #+#             */
/*   Updated: 2025/11/10 09:31:39 by marvin           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int	in_set(char c, const char *set)
{
	size_t	i;

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

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

	if (!s1)
		return (NULL);
	if (!set || *set == '\0')
		return (ft_strdup(s1));
	start = 0;
	while (s1[start] != '\0' && in_set(s1[start], set))
		start++;
	end = ft_strlen(s1);
	while (end > start && in_set(s1[end - 1], set))
		end--;
	len = end - start;
	out = (char *)malloc(sizeof(char) * (len + 1));
	if (!out)
		return (NULL);
	ft_memcpy(out, s1 + start, len);
	out[len] = '\0';
	return (out);
}