get_next_line.c

#include "get_next_line.h"

char	*read_file(int fd, char *stash)
{
    char        buf[BUFFER_SIZE];
	int         nread;
    int         i;

	nread = 1;
    i = 0;
    while (i < BUFFER_SIZE)
    {
        buf[i] = '\0';
        i++;
    }
	while (nread && !(ft_strchr(buf, '\n')))
	{
		nread = read(fd, buf, BUFFER_SIZE);
		if (nread == -1)
			return (free(stash), NULL);
        buf[nread] = '\0';
		stash = ft_strjoin(stash, buf);
		if (!stash)
			return (NULL);
	}
	return (stash);
}

char    *extract_line(char *stash)
{
    char        *line;
    int         i;

    i = 0;
    line = NULL;
    if (stash[i] == '\0')
        return (NULL);
    while (stash[i] && stash[i] != '\n')
        i++;
    line = ft_substr(stash, 0, i + 1);
    if (!line)
        return (NULL);
    return (line);
}

char    *clean_stash(char *stash)
{
    char        *tmp;
    int         i;

    tmp = NULL;
    i = 0;
    while (stash[i] && stash[i] != '\n')
        i++;
    if (stash[i] == '\0')
        return (free(stash), NULL);
    tmp = ft_substr(stash, i + 1, ft_strlen(stash));
    if (!tmp)
        return (NULL);
    free(stash);
    return (tmp);
}

char    *get_next_line(int fd)
{
    static char *stash;
    char        *line;
    
    if (fd < 0 || BUFFER_SIZE < 1)
		return (NULL);
    stash = read_file(fd, stash);
    if (!stash)
        return (NULL);
    line = extract_line(stash);
    if (!line)
        return (free(stash), NULL);
    stash = clean_stash(stash);
    return (line);
}