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

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: etchipoq <etchipoq@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/09/16 12:16:08 by etchipoq          #+#    #+#             */
/*   Updated: 2025/11/07 15:43:41 by etchipoq         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

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

static int	le(const char *s, const char *s2)
{
	int	i;
	int	end;

	i = 0;
	end = ft_strlen(s) - 1;
	while (s[i] && is_set(s[i], s2))
		i++;
	while (end >= 0 && is_set(s[end], s2))
		end--;
	if (end - i < 0)
		return (0);
	return (end - i + 1);
}

char	*ft_strtrim(char const *s1, char const *set)
{
	int		i;
	char	*str;
	int		end;

	i = 0;
	if (!s1 || !set)
		return (NULL);
	end = ft_strlen(s1) - 1;
	str = malloc(sizeof(char) * (le(s1, set) + 1));
	if (!str)
		return (NULL);
	while (is_set(s1[i], set) && s1[i])
		i++;
	while (is_set(s1[end], set) && end >= 0)
		end--;
	if (end < i)
	{
		str[0] = '\0';
		return (str);
	}
	ft_strlcpy(str, &s1[i], le(s1, set) + 1);
	return (str);
}
/* #include <stdio.h>
int main (void)
{
	//s = ft_strtrim("tripouille   xxx", " x");
	char *p="   xxx   xxx";
	char *sep = " x";
	char *res = ft_strtrim(p,sep);
	printf("%s\n", res);
	free(res);
} */