ft_strtrim.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ciglesia <ciglesia@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/08/13 20:40:47 by ciglesia          #+#    #+#             */
/*   Updated: 2019/08/13 20:40:48 by ciglesia         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int	ft_condition(char const *s, int i)
{
	return (s[i] && (s[i] == ' ' || s[i] == '\n' || s[i] == '\t'));
}

char		*ft_strtrim(char const *s)
{
	int		ls;
	int		sb;
	int		i;
	char	*copy;
	char	*str;

	if (s)
	{
		ls = ft_strlen(s);
		i = 0;
		while (ft_condition(s, i))
			i++;
		sb = i;
		if (sb == ls)
			return (ft_strdup(""));
		copy = (char*)&s[i];
		i = ls - 1;
		while (ft_condition(s, i))
			i--;
		if (!(str = ft_strnew(i - sb + 1)))
			return (NULL);
		ft_strncpy(str, copy, i - sb + 1);
		return (str);
	}
	return (NULL);
}