1 /**************************************************************
2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 *
20 *************************************************************/
21
22
23
24 #include <ctype.h>
25 #include <errno.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29
main()30 int main() {
31 for (;;) {
32 int c;
33 errno = 0;
34 c = getchar();
35 if (c == EOF) {
36 exit(errno == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
37 } else if (isalnum(c) || strchr("!$'()*+,-.:=@_~/\n", c) != NULL) {
38 /* valid RFC 2396 pchar characters + '/' + newline */
39 if (putchar(c) == EOF) {
40 exit(EXIT_FAILURE);
41 }
42 } else if (printf("%%%02X", (unsigned char) (char) c) < 0) {
43 exit(EXIT_FAILURE);
44 }
45 }
46 }
47