libft/ft_strtrim.c at main · umarsajidm/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: musajid <musajid@student.hive.fi>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/05/11 23:04:16 by musajid           #+#    #+#             */
/*   Updated: 2025/05/23 19:11:55 by musajid          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int	to_trim(const char *set, char c);

char	*ft_strtrim(const char *s1, const char *set)
{
	size_t	i;
	size_t	j;

	i = 0;
	if (!s1 || !set)
		return (NULL);
	j = ft_strlen(s1) - 1;
	if (ft_strlen(s1) == 0)
		return (ft_strdup(""));
	while (to_trim(set, s1[i]))
		i++;
	while (to_trim(set, s1[j]))
		j--;
	return (ft_substr(s1, i, j - (i - 1)));
}

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

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