42_INT_02_gnl/testt/get_next_line.c

#include <libc.h>

void	*ft_memalloc(size_t size)
{
	void	*mem;
	size_t	i;

	i = 0;
	if (!(mem = malloc(size)))
		return (NULL);
	while (i < size)
	{
		((char*)mem)[i] = 0;
		i++;
	}
	return (mem);
}

size_t	ft_strlen(const char *str)
{
	size_t i;

	i = 0;
	while (str[i])
		i++;
	return (i);
}

char	*ft_strjoin(char const *s1, char const *s2)
{
	size_t	i;
	size_t	j;
	char	*str;
	size_t	str_len;

	i = 0;
	j = 0;
	if (!(s1 && s2))
		return (NULL);
	str_len = (ft_strlen(s1) + ft_strlen(s2));
	if (!(str = (char *)malloc(sizeof(*str) * (str_len + 1))))
		return (NULL);
	while (s1[i])
	{
		str[i] = s1[i];
		i++;
	}
	while (s2[j])
		str[i++] = s2[j++];
	str[i] = '\0';
	return (str);
}

char	*ft_strchr(const char *s, int c)
{
	int		i;
	char	ch;

	i = 0;
	ch = c;
	while (s[i])
	{
		if (s[i] == ch)
			return ((char*)s + i);
		i++;
	}
	if (s[i] == '\0' && ch == '\0')
		return ((char*)s + i);
	return (NULL);
}

char	*ft_substr(char const *s, unsigned int start, size_t len)
{
	size_t	i;
	char	*rt;

	i = 0;
	if (!s)
		return (NULL);
	if (start > ft_strlen(s))
		len = 0;
	if (!(rt = (char *)malloc(sizeof(*rt) * (len + 1))))
		return (NULL);
	while (*s + start && i < len)
	{
		rt[i] = s[start];
		i++;
		start++;
	}
	rt[i] = '\0';
	return (rt);
}



/////////////////////////////////////////////////////////////



static void	free_it(char **str)
{
	if (str)
	{
		free(*str);
		*str = NULL;
	}
}

static int	separate_lines(char **line, char **str, int fd)
{
	int		i;
	char	*rest;

	i = 0;
	while (str[fd][i] && str[fd][i] != '\n')
		i++;
	if (!(*line = ft_substr(str[fd], 0, i)))
	{
		free_it(&str[fd]);
		return (-1);
	}
	if (str[fd][i])
	{
		if (!(rest = ft_substr(str[fd], i + 1, ft_strlen(str[fd]) - (i + 1))))
		{
			free_it(&str[fd]);
			return (-1);
		}
		free_it(&str[fd]);
		str[fd] = rest;
		return (1);
	}
//	free_it(&str[fd]);
	return (0);
}

int			get_next_line(int fd, char **line)
{
	static char	*str[OPEN_MAX];
	char		buf[BUFFER_SIZE + 1];
	int			i;
	char		*tmp;

	if (fd < 0 || fd >= OPEN_MAX || !line || BUFFER_SIZE <= 0
		|| read(fd, buf, 0) < 0)
		return (-1);
	if (!str[fd])
		if (!(str[fd] = (char*)ft_memalloc(sizeof(char) * 1)))
			return (-1);
	while (!ft_strchr(str[fd], '\n') && (i = read(fd, buf, BUFFER_SIZE)) > 0)
	{
		buf[i] = '\0';
		if (!(tmp = ft_strjoin(str[fd], buf)))
		{
			free_it(&str[fd]);
			return (-1);
		}
		free_it(&str[fd]);
		str[fd] = tmp;
	}
	return (separate_lines(line, str, fd));
}



/////////////////////////////////////////////////////////////


	int		main(int ac, char **av)
	{
		int		fd1;
		int		fd2;
		int		i;
		char	*line;

		line = NULL;
		fd1 = open(av[1], O_RDONLY);
		fd2 = open(av[2], O_RDONLY);
		if (ac < 2)
			return (0);
		while ((i = get_next_line(fd1, &line)) > 0)
		{
			printf("%i", i);
			printf("%s\n",line);
			free(line);
			if ((i = get_next_line(fd2, &line)) > 0)
			{
				printf("%s\n",line);
				free(line);
			}
			printf("%i", i);
		}
		printf("%i", i);
		while (1);
		return (0);
	}