split_lines.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   split_lines.c                                      :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kamitsui <kamitsui@student.42tokyo.jp>     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/12/17 21:50:06 by kamitsui          #+#    #+#             */
/*   Updated: 2024/12/17 21:51:01 by kamitsui         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "cub3d.h"
 
size_t  count_lines(const char *str)
{
    size_t  lines;
 
    lines = 0;
    while (*str)
    {
        if (*str == '\n')
            lines++;
        str++;
    }
    return (lines + 1);
}
 
static char *extract_next_line(const char **str)
{
    const char  *start;
    size_t      len;
    char        *line;
 
    start = *str;
    while (**str && **str != '\n')
        (*str)++;
    len = *str - start;
    line = ft_strndup(start, len);
    if (line == NULL)
        return (NULL);
    if (**str == '\n')
        (*str)++;
    return (line);
}
 
char    **split_lines(const char *str)
{
    size_t  line_count;
    char    **lines;
    size_t  i;
 
    if (str == NULL)
        return (NULL);
    line_count = count_lines(str);
    lines = (char **)malloc((line_count + 1) * sizeof(char *));
    if (lines == NULL)
        return (NULL);
    i = 0;
    while (*str != '\0')
        lines[i++] = extract_next_line(&str);
    lines[i] = NULL;
    return (lines);
}