ft_strsplit.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strsplit.c                                      :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: unite <marvin@42.fr>                       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/09/05 13:31:18 by unite             #+#    #+#             */
/*   Updated: 2020/07/16 02:43:07 by unite            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "libft.h"
#include <stdlib.h>
 
static void         free_tab(char **tab)
{
    int i;
 
    i = 0;
    while (tab[i])
        free(tab[i++]);
    free(tab);
}
 
static const char   *search_delim(const char *s, char delim)
{
    while (*s && *s != delim)
        s++;
    return (s);
}
 
static const char   *search_not_delim(const char *s, char delim)
{
    while (*s && *s == delim)
        s++;
    return (s);
}
 
static size_t       count_words(const char *s, char delim)
{
    size_t  count;
 
    count = 0;
    s = search_not_delim(s, delim);
    while (*s)
    {
        count++;
        s = search_delim(s, delim);
        s = search_not_delim(s, delim);
    }
    return (count);
}
 
char                **ft_strsplit(char const *s, char delim)
{
    char        **tab;
    const char  *start;
    const char  *end;
    size_t      wcount;
    size_t      i;
 
    wcount = count_words(s, delim);
    if (!(tab = ft_memalloc(sizeof(char *) * (wcount + 1))))
        return (NULL);
    i = 0;
    end = s;
    while (i < wcount)
    {
        start = search_not_delim(end, delim);
        end = search_delim(start, delim);
        if (!(tab[i] = ft_strndup(start, end - start)))
        {
            free_tab(tab);
            return (NULL);
        }
        i++;
    }
    tab[i++] = NULL;
    return (tab);
}