From: Willy Tarreau Date: Mon, 28 Mar 2011 13:55:43 +0000 (+0200) Subject: [MINOR] tools: add two macros MID_RANGE and MAX_RANGE X-Git-Tag: v1.5-dev8~255 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d3db94399f762d0aae911e2fe16f1cf2c37f6a9b;p=thirdparty%2Fhaproxy.git [MINOR] tools: add two macros MID_RANGE and MAX_RANGE Those will be used later, they return the largest and middle integer possible for a given variable or type. --- diff --git a/include/common/tools.h b/include/common/tools.h index 526ea7fbfa..398383ad38 100644 --- a/include/common/tools.h +++ b/include/common/tools.h @@ -1,22 +1,22 @@ /* - include/common/tools.h - Trivial macros needed everywhere. - - Copyright (C) 2000-2006 Willy Tarreau - w@1wt.eu - - This library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation, version 2.1 - exclusively. - - 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with this library; if not, write to the Free Software - Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * include/common/tools.h + * Trivial macros needed everywhere. + * + * Copyright (C) 2000-2011 Willy Tarreau - w@1wt.eu + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation, version 2.1 + * exclusively. + * + * 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef _COMMON_TOOLS_H @@ -33,6 +33,14 @@ #define MAX(a, b) (((a) > (b)) ? (a) : (b)) #endif +/* return an integer of type with only the highest bit set. 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 , with all bits set */ +#define MAX_RANGE(ret) (~(typeof(ret))0) + #endif /* _COMMON_TOOLS_H */ /*