refactoring: new function split_rcpts() replaces two others split_rcpts() merges rcptlist_with_one_of_hostlist() and rcptlist_with_addr_is_local() into one with hardly adding complexity I'd actually say that the overall complexity decreased. Have a look at the comment for split_rcpts() in route.c

#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);
}