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https://github.com/xorgy/mediafire-fuse
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54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/*
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* Copyright (C) 2013 Bryan Christ <bryan.christ@mediafire.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2, as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef _MACROS_H_
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#define _MACROS_H_
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// calculate the absolute value on a 2s-complement system
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#define ABSINT(x) ((x^(x>>((sizeof(x)*8)-1)))-(x>>((sizeof(x)*8)-1)))
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// count the number of elements in the first axis of an array
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#define DIM(x) (sizeof(x)/sizeof(x[0]))
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// portable implementation of getpagesize(). see NOTE 1 below.
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#if (!defined getpagesize) && (defined _SC_PAGESIZE)
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#define getpagesize(x) (sysconf(_SC_PAGESIZE))
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#endif
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#if (!defined getpagesize) && (defined _SC_PAGE_SIZE)
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#define getpagesize(x) (sysconf(_SC_PAGE_SIZE))
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#endif
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/*
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Note 1: Regarding getpagesize()
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In SUSv2 the getpagesize() call is labeled LEGACY, and in POSIX.1-2001
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it has been dropped; HP-UX does not have this call.
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I suspect on most systems that do have getpagesize() it is a macro so
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we'll assume it to be. If not, we'll define it ourselves.
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Note: That on some systems both _SC_PAGESIZE and _SC_PAGE_SIZE are
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interchangeable so we'll try both.
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*/
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#endif
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