usr.sbin/fifolog/lib/miniobj.h

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2005-2008 Poul-Henning Kamp
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD$
  29  */
  30
  31 #define ALLOC_OBJ(to, type_magic)                                       \
  32         do {                                                            \
  33                 (to) = calloc(1, sizeof *(to));                         \
  34                 if ((to) != NULL)                                       \
  35                         (to)->magic = (type_magic);                     \
  36         } while (0)
  37
  38 #define FREE_OBJ(to)                                                    \
  39         do {                                                            \
  40                 (to)->magic = (0);                                      \
  41                 free(to);                                               \
  42         } while (0)
  43
  44 #define VALID_OBJ(ptr, type_magic)                                      \
  45         ((ptr) != NULL && (ptr)->magic == (type_magic))
  46
  47 #define CHECK_OBJ(ptr, type_magic)                                      \
  48         do {                                                            \
  49                 assert((ptr)->magic == type_magic);                     \
  50         } while (0)
  51
  52 #define CHECK_OBJ_NOTNULL(ptr, type_magic)                              \
  53         do {                                                            \
  54                 assert((ptr) != NULL);                                  \
  55                 assert((ptr)->magic == type_magic);                     \
  56         } while (0)
  57
  58 #define CHECK_OBJ_ORNULL(ptr, type_magic)                               \
  59         do {                                                            \
  60                 if ((ptr) != NULL)                                      \
  61                         assert((ptr)->magic == type_magic);             \
  62         } while (0)
  63
  64 #define CAST_OBJ(to, from, type_magic)                                  \
  65         do {                                                            \
  66                 (to) = (from);                                          \
  67                 if ((to) != NULL)                                       \
  68                         CHECK_OBJ((to), (type_magic));                  \
  69         } while (0)
  70
  71 #define CAST_OBJ_NOTNULL(to, from, type_magic)                          \
  72         do {                                                            \
  73                 (to) = (from);                                          \
  74                 assert((to) != NULL);                                   \
  75                 CHECK_OBJ((to), (type_magic));                          \
  76         } while (0)