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The LXR Cross Referencer for SOS

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001 /* Copyright (C) 2004  The KOS Team
002 
003    This program is free software; you can redistribute it and/or
004    modify it under the terms of the GNU General Public License
005    as published by the Free Software Foundation; either version 2
006    of the License, or (at your option) any later version.
007    
008    This program is distributed in the hope that it will be useful,
009    but WITHOUT ANY WARRANTY; without even the implied warranty of
010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
011    GNU General Public License for more details.
012    
013    You should have received a copy of the GNU General Public License
014    along with this program; if not, write to the Free Software
015    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
016    USA. 
017 */
018 #ifndef _SOS_MACROS_H_
019 #define _SOS_MACROS_H_
020 
021 /** Align on a boundary (MUST be a power of 2), so that return value <= val */
022 #define SOS_ALIGN_INF(val,boundary) \
023   (((unsigned)(val)) & (~((boundary)-1)))
024  
025 /** Align on a boundary (MUST be a power of 2), so that return value >= val */
026 #define SOS_ALIGN_SUP(val,boundary) \
027   ({ unsigned int __bnd=(boundary); \
028      (((((unsigned)(val))-1) & (~(__bnd - 1))) + __bnd); })
029 
030 /** Check whether val is aligned on a boundary (MUST be a power of 2) */
031 #define SOS_IS_ALIGNED(val,boundary) \
032   ( 0 == (((unsigned)(val)) & ((boundary)-1)) )
033 
034 /**
035  * @return TRUE if val is a power of 2.
036  * @note val is evaluated multiple times
037  */
038 #define SOS_IS_POWER_OF_2(val) \
039   ((((val) - 1) & (val)) == 0)
040 
041 /**
042  * Standard macro to get the offset of the given field in a structure
043  */
044 #define offsetof(type,field) \
045   ((unsigned) &(((type *)0)->field))
046 
047 #endif /* _SOS_MACROS_H_ */

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