Singleton in C

singleton.c

// Header
#define MAX_FLAG 0xe

typedef struct s_printf	t_printf;

struct s_printf
{
	const char	flag;
	int	(*cb)(const char *, int);
};

const	t_printf	*get_flag(const char flag);

// Source
const t_printf	*get_flag(const char flag)
{
	static const t_printf	f[MAX_FLAG] = {
		{ 's', ft_putstr_fd  },
		{ 'c', ft_putchar_fd  },
	};
	int	i;

	i = 0;
	while (i < MAX_FLAG)
	{
		if (f[i].flag == flag)
			return (&f[i]);
		i++;
	}
	return (NULL);
}