/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
 * Copyright 2000, 2010 Oracle and/or its affiliates.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
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 ************************************************************************/

#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main() {
    for (;;) {
        int c;
        errno = 0;
        c = getchar();
        if (c == EOF) {
            exit(errno == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
        } else if (isalnum(c) || strchr("!$'()*+,-.:=@_~/\n", c) != NULL) {
            /* valid RFC 2396 pchar characters + '/' + newline */
            if (putchar(c) == EOF) {
                exit(EXIT_FAILURE);
            }
        } else if (printf("%%%02X", (unsigned char) (char) c) < 0) {
            exit(EXIT_FAILURE);
        }
    }
}