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#ifndef SYS_INCLUDE_H
#define SYS_INCLUDE_H
/* ========================================================================== **
* sys_include.h
*
* Copyright (C) 1998 by Christopher R. Hertel
*
* Email: crh@ubiqx.mn.org
* -------------------------------------------------------------------------- **
* This header provides system declarations and data types used internally
* by the ubiqx modules.
* -------------------------------------------------------------------------- **
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* -------------------------------------------------------------------------- **
*
* You may want to replace this file with your own system specific header,
* or you may find that this default header has everything you need. In
* most cases, I expect the latter to be the case. The ubi_* modules were
* written to be as clean as possible. On purpose. There are limits,
* though. Variations in compilers, and competing standards have made it
* difficult to write code that just compiles. In particular, the location
* of a definition of NULL seems to be less than consistant.
*
* This header makes a good attempt to find NULL. If you find that you
* need something more on your system make sure that you keep a copy of
* your version so that it won't be overwritten by updates of the ubiqx
* code.
*
* -------------------------------------------------------------------------- **
*
* $Log: sys_include.h,v $
* Revision 1.1 2001/06/26 02:19:48 roesch
* * oops, forgot a file...
*
* Revision 0.0 1998/06/02 02:20:49 crh
* Initial Revision.
*
* ========================================================================== **
*/
/* -------------------------------------------------------------------------- **
* Looking for NULL.
*
* The core ubiqx modules (all those beginning with 'ubi_') rely on very
* little from the outside world. One exception is that we need a
* defintion for NULL. This has turned out to be something of a problem,
* as NULL is NOT always defined in the same place on different systems.
*
* Ahh... standards...
*
* K&R 2nd Ed. (pg 102) says NULL should be in <stdio.h>. I've heard
* that it is in <locale.h> on some systems. I've also seen it in
* <stddef.h> and <stdlib.h>. In most cases it's defined in multiple
* places. We'll try several of them. If none of these work on your
* system, please send E'mail and let me know where you get your NULL!
*
* The purpose of the mess below, then, is simply to supply a definition
* of NULL to the ubi_*.c files. Keep in mind that C compilers (all
* those of which I'm aware) will allow you to define a constant on the
* command line, eg.: -DNULL=((void *)0).
*
* Also, 99.9% of the time, NULL is zero. I have been informed of at
* least one exception.
*
* crh; may 1998
*/
#ifndef NULL
#include <stddef.h>
#endif
#ifndef NULL
#include <stdlib.h>
#endif
#ifndef NULL
#include <stdio.h>
#endif
#ifndef NULL
#include <locale.h>
#endif
#ifndef NULL
#define NULL ((void *)0)
#endif
/* ================================ The End ================================= */
#endif /* SYS_INCLUDE_H */
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