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/* ucl_ptr.c -- low-level pointer constructs
This file is part of the UCL data compression library.
Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
The UCL library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
The UCL 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with the UCL library; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/ucl/
*/
#include "ucl_conf.h"
/***********************************************************************
//
************************************************************************/
UCL_PUBLIC(ucl_ptr_t)
__ucl_ptr_linear(const ucl_voidp ptr)
{
ucl_ptr_t p;
#if defined(__UCL_DOS16) || defined(__UCL_WIN16)
p = (((ucl_ptr_t)(_FP_SEG(ptr))) << (16 - __UCL_HShift)) + (_FP_OFF(ptr));
#else
p = PTR_LINEAR(ptr);
#endif
return p;
}
/***********************************************************************
//
************************************************************************/
UCL_PUBLIC(unsigned)
__ucl_align_gap(const ucl_voidp ptr, ucl_uint size)
{
ucl_ptr_t p, s, n;
assert(size > 0);
p = __ucl_ptr_linear(ptr);
s = (ucl_ptr_t) (size - 1);
#if 0
assert((size & (size - 1)) == 0);
n = ((p + s) & ~s) - p;
#else
n = (((p + s) / size) * size) - p;
#endif
assert((long)n >= 0);
assert(n <= s);
return (unsigned)n;
}
/*
vi:ts=4:et
*/
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