#include "broken_gnl.h"

#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>


char	*ft_strchr(char *s, int c)
{
	int	i = 0;
	while (s[i] && s[i] != c)
		i++;
	if (s[i] == c)
		return (s + i);
	else
		return (NULL);
}

void	*ft_memcpy(void *dest, const void *src, size_t n)
{
	size_t	i = 0;
	while (i < n)
	{
		((char *)dest)[i] = ((char *)src)[i];
		i++;
	}                                         
	return (dest);                            
	
}

size_t	ft_strlen(char *s)
{
	if (!s)
		return 0;
	size_t	ret = 0;
	while (*s)
	{
		s++;
		ret++;
	}
	return (ret);
}

int	str_append_mem(char **s1, char *s2, size_t size2)
{
	size_t	size1 = ft_strlen(*s1);
	char	*tmp = malloc(size2 + size1 + 1);
	if (!tmp)
		return (0);
	if (*s1)
		ft_memcpy(tmp, *s1, size1);
	ft_memcpy(tmp + size1, s2, size2);
	tmp [size1 + size2] = 0;
	free(*s1);
	*s1 = tmp;
	return (1);
}

int	str_append_str(char **s1, char *s2)
{
	return (str_append_mem(s1, s2, ft_strlen(s2)));
}

void	*ft_memmove(void *dest, const void *src, size_t n)
{
	if (dest == src)
		return (dest);
	return (ft_memcpy(dest, src, n));
}

char	*get_next_line(int fd)
{
	static char	b[BUFFER_SIZE + 1] = "";
	char	*ret = NULL;

	char	*tmp = ft_strchr(b, '\n');
	while (!tmp)
	{
		if (!str_append_str(&ret, b))
			return (NULL);
		int	read_ret = read(fd, b, BUFFER_SIZE);
		if (read_ret == -1 || read_ret == 0) 
		{
			free(ret);
			return (NULL);
		}
		b[read_ret] = 0;
		tmp = ft_strchr(b, '\n');
	}
	if (!str_append_mem(&ret, b, tmp - b + 1))
	{
		free(ret);
		return (NULL);
	}
	ft_memmove(b, tmp + 1, ft_strlen(tmp + 1) + 1);
	return (ret);
}