ft_strtrim.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: abdsalah <abdsalah@student.42amman.com>    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/08/29 14:05:24 by abdsalah          #+#    #+#             */
/*   Updated: 2024/09/01 14:09:53 by abdsalah         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static char	*ft_strncpy(char *dest, const char *src, size_t n)
{
	size_t	i;

	i = 0;
	while (i < n && src[i] != '\0')
	{
		dest[i] = src[i];
		i++;
	}
	while (i < n)
		dest[i++] = '\0';
	return (dest);
}

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

	if (s1 == NULL)
		return (NULL);
	if (set == NULL || *set == '\0')
		return (ft_strdup(s1));
	start = s1;
	while (*start && ft_strchr(set, *start))
		start++;
	if (*start == '\0')
		return (ft_strdup(""));
	end = s1 + ft_strlen(s1) - 1;
	while (end > start && ft_strchr(set, *end))
		end--;
	len = (end - start) + 1;
	out = malloc(len + 1);
	if (out == NULL)
		return (NULL);
	ft_strncpy(out, start, len);
	out[len] = '\0';
	return (out);
}