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[MINOR] tools: add two macros MID_RANGE and MAX_RANGE

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Those will be used later, they return the largest and middle integer
possible for a given variable or type.
This commit is contained in:
Willy Tarreau 2011-03-28 15:55:43 +02:00
parent 26f0f17200
commit d3db94399f
1 changed files with 26 additions and 18 deletions

44
include/common/tools.h
View File

@ -1,22 +1,22 @@
/* /*
include/common/tools.h * include/common/tools.h
Trivial macros needed everywhere. * Trivial macros needed everywhere.
*
Copyright (C) 2000-2006 Willy Tarreau - w@1wt.eu * Copyright (C) 2000-2011 Willy Tarreau - w@1wt.eu
*
This library is free software; you can redistribute it and/or * This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public * modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation, version 2.1 * License as published by the Free Software Foundation, version 2.1
exclusively. * exclusively.
*
This library is distributed in the hope that it will be useful, * This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of * but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details. * Lesser General Public License for more details.
*
You should have received a copy of the GNU Lesser General Public * You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software * License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/ */
#ifndef _COMMON_TOOLS_H #ifndef _COMMON_TOOLS_H
@ -33,6 +33,14 @@
#define MAX(a, b) (((a) > (b)) ? (a) : (b)) #define MAX(a, b) (((a) > (b)) ? (a) : (b))
#endif #endif
/* return an integer of type <ret> with only the highest bit set. <ret> may be
* both a variable or a type.
*/
#define MID_RANGE(ret) ((typeof(ret))1 << (8*sizeof(ret) - 1))
/* return the largest possible integer of type <ret>, with all bits set */
#define MAX_RANGE(ret) (~(typeof(ret))0)
#endif /* _COMMON_TOOLS_H */ #endif /* _COMMON_TOOLS_H */
/* /*