| /************************************************************** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| |
| #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); |
| } |
| } |
| } |