42_libft/ft_split.c at master · Hacking-jack/42_libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_split.c                                         :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: danrodr3 <danrodr3@students.42madrid.com>  +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/10/13 17:44:28 by danrodr3          #+#    #+#             */
/*   Updated: 2025/10/13 17:46:51 by danrodr3         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
#include "libft.h"

static int	count_words(char const *s, char c)
{
	int	i;
	int	w;

	i = 0;
	w = 0;
	while (s[i])
	{
		if ((s[i] != c) && (i == 0 || s[i - 1] == c))
			w++;
		i++;
	}
	return (w);
}

static void	free_split(char **res, int j)
{
	while (--j >= 0)
		free(res[j]);
	free(res);
}

static char	**fill_split(char const *s, char c, char **res, int words)
{
	int	i;
	int	j;
	int	start;

	i = 0;
	j = 0;
	while (s[i] && j < words)
	{
		while (s[i] == c)
			i++;
		start = i;
		while (s[i] && s[i] != c)
			i++;
		if (i > start)
		{
			res[j] = ft_substr(s, start, i - start);
			if (!res[j])
				return (free_split(res, j), NULL);
			j++;
		}
	}
	res[j] = 0;
	return (res);
}

char	**ft_split(char const *s, char c)
{
	char	**res;
	int		words;

	if (!s)
		return (NULL);
	words = count_words(s, c);
	res = malloc(sizeof(char *) * (words + 1));
	if (!res)
		return (NULL);
	return (fill_split(s, c, res, words));
}