Security fix! Correct handling of seteuid() return value See Debian bug #638002, reported by John Lightsey. When possible the (already available) set_euidgid() function is used. Additionally, it is unnecessary to change the identity when writing into an already open file descriptor. This should fix the problem.

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

#include "base64.h"

int
main()
{
	gchar in[58];
	gint size;

	do {
		gchar *out;

		size = fread(in, 1, 54, stdin);
		out = base64_encode(in, size);
		fputs(out, stdout);
		putchar('\n');
		g_free(out);
	} while (size == 54);
	exit(0);
}