/*
 * Copyright (C) 2013 Bryan Christ <bryan.christ@mediafire.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2, as published by
 * the Free Software Foundation.
 *
 * This program 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 General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */


#ifndef _MACROS_H_
#define _MACROS_H_

// calculate the absolute value on a 2s-complement system
#define ABSINT(x)   ((x^(x>>((sizeof(x)*8)-1)))-(x>>((sizeof(x)*8)-1)))

// count the number of elements in the first axis of an array
#define DIM(x)      (sizeof(x)/sizeof(x[0]))

// portable implementation of getpagesize().  see NOTE 1 below.
#if (!defined getpagesize) && (defined _SC_PAGESIZE)
#define getpagesize(x)  (sysconf(_SC_PAGESIZE))
#endif
#if (!defined getpagesize) && (defined _SC_PAGE_SIZE)
#define getpagesize(x)  (sysconf(_SC_PAGE_SIZE))
#endif

/*
    Note 1: Regarding getpagesize()

    In SUSv2 the getpagesize() call is labeled LEGACY, and in POSIX.1-2001
    it has been dropped;  HP-UX does not have this call.

    I suspect on most systems that do have getpagesize() it is a macro so
    we'll assume it to be.  If not, we'll define it ourselves.

    Note: That on some systems both _SC_PAGESIZE and _SC_PAGE_SIZE are
    interchangeable so we'll try both.
*/



#endif