refactored alias.c heavily especially substituted the loop-based alias_expand() with a recursive approach. Now alias_expand() wraps alias_one() which recursively expands aliases. In principle the ``data processing'' is the same but now it's clearer structured and thus easier to understand IMO. The loop might have been faster but I don't care for speed -- the most simple solution is the best. It's fast enough, that is sufficient.

#include <glib.h>
#include <stdio.h>
#include <stdlib.h>

#include "base64.h"

int
main()
{
	gchar line[100];
	gchar *buf;
	gint size;

	while (fgets(line, 100, stdin)) {
		buf = base64_decode(line, &size);
		fwrite(buf, size, 1, stdout);
		g_free(buf);
	}
	exit(0);
}