mdw@git.distorted.org.uk Git - mLib/blob - utils/align.h

   1 /* -*-c-*-
   2  *
   3  * Pointer alignment hack
   4  *
   5  * (c) 2003 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the mLib utilities library.
  11  *
  12  * mLib is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU Library General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  * mLib is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public
  23  * License along with mLib; if not, write to the Free
  24  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 #ifndef MLIB_ALIGN_H
  29 #define MLIB_ALIGN_H
  30
  31 #ifdef __cplusplus
  32   extern "C" {
  33 #endif
  34
  35 /*----- Data structures ---------------------------------------------------*/
  36
  37 union align {
  38   int i;
  39   long l;
  40   double d;
  41   void *p;
  42   void (*f)(void *);
  43   struct notexist *s;
  44 };
  45
  46 /*----- Macros provided ---------------------------------------------------*/
  47
  48 #define ALIGN(sz) do {                                                  \
  49   sz += sizeof(union align) - 1;                                        \
  50   sz -= sz % sizeof(union align);                                       \
  51 } while (0)
  52
  53 /*----- That's all, folks -------------------------------------------------*/
  54
  55 #ifdef __cplusplus
  56   }
  57 #endif
  58
  59 #endif