usr.sbin/fifolog/lib/miniobj.h

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