tests/test-ofpbuf.c

   1 /*
   2  * Copyright (c) 2015 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18 #undef NDEBUG
  19 #include <stdio.h>
  20 #include "openvswitch/ofpbuf.h"
  21 #include "ovstest.h"
  22 #include "util.h"
  23
  24 #define BUF_SIZE 100
  25 #define HDR_OFS 10
  26 #define MSG_OFS 50
  27
  28 static void
  29 test_ofpbuf_main(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
  30 {
  31     struct ofpbuf *buf = ofpbuf_new(BUF_SIZE);
  32     int exit_code = 0;
  33
  34     /* Init checks. */
  35     ovs_assert(!buf->size);
  36     ovs_assert(buf->allocated == BUF_SIZE);
  37     ovs_assert(buf->base == buf->data);
  38
  39     /* Sets 'buf->header' and 'buf->msg'. */
  40     buf->header = (char *) buf->base + HDR_OFS;
  41     buf->msg = (char *) buf->base + MSG_OFS;
  42
  43     /* Gets another 'BUF_SIZE' bytes headroom. */
  44     ofpbuf_prealloc_headroom(buf, BUF_SIZE);
  45     ovs_assert(!buf->size);
  46     ovs_assert(buf->allocated == 2 * BUF_SIZE);
  47     ovs_assert((char *) buf->base + BUF_SIZE == buf->data);
  48     /* Now 'buf->header' and 'buf->msg' must be BUF_SIZE away from
  49      * their original offsets. */
  50     ovs_assert(buf->header == (char *) buf->base + BUF_SIZE + HDR_OFS);
  51     ovs_assert(buf->msg == (char *) buf->base + BUF_SIZE + MSG_OFS);
  52
  53     /* Gets another 'BUF_SIZE' bytes tailroom. */
  54     ofpbuf_prealloc_tailroom(buf, BUF_SIZE);
  55     /* Must remain unchanged. */
  56     ovs_assert(!buf->size);
  57     ovs_assert(buf->allocated == 2 * BUF_SIZE);
  58     ovs_assert((char *) buf->base + BUF_SIZE == buf->data);
  59     ovs_assert(buf->header == (char *) buf->base + BUF_SIZE + HDR_OFS);
  60     ovs_assert(buf->msg == (char *) buf->base + BUF_SIZE + MSG_OFS);
  61
  62     ofpbuf_delete(buf);
  63     exit(exit_code);
  64 }
  65
  66 OVSTEST_REGISTER("test-ofpbuf", test_ofpbuf_main);