42_libft/ft_split.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_split.c                                         :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cchauvet <cchauvet@student.42angoulem      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/09/29 17:37:50 by cchauvet          #+#    #+#             */
/*   Updated: 2022/10/04 21:24:29 by cchauvet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static size_t	ft_seglen(const char *s, char c)
{
	size_t	len;
	size_t	i;

	if (*s == 0)
		return (1);
	len = 1;
	i = 0;
	while (s[i])
	{
		while (s[i] == c && s[i])
			i++;
		if (s[i])
			len++;
		while (s[i] != c && s[i])
			i++;
	}
	if (len == 1)
		return (2);
	return (len);
}

static void	*ft_cancel(size_t len, char **tab)
{
	size_t	i;

	i = 0;
	while (i < len)
	{
		free(tab[i]);
		i++;
	}
	free(tab);
	return (NULL);
}

static char	**ft_segmentator(const char *s, char c, size_t len, char **tab)
{
	size_t	i;
	size_t	j;
	ssize_t	start;

	if (tab == NULL)
		return (NULL);
	i = 0;
	j = 0;
	while (i < len)
	{
		while (s[j] == c)
			j++;
		start = j;
		while (s[j] != c)
			j++;
		tab[i] = ft_substr(s, start, j - start);
		if (tab[i] == NULL)
			return (ft_cancel(len, tab));
		i++;
	}
	return (tab);
}

char	**ft_split(const char *s, char c)
{
	char	**tab;
	size_t	len;

	if (s == NULL)
		return (NULL);
	len = ft_seglen(s, c);
	tab = malloc(sizeof(char *) * (len));
	if (tab == NULL)
		return (NULL);
	if (c == 0 || !*s)
	{
		tab[0] = ft_strdup(s);
		if (tab[0] == NULL)
			return (NULL);
	}
	else
		tab = ft_segmentator(s, c, len - 1, tab);
	tab[len - 1] = NULL;
	return (tab);
}