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flonum-copy.c
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C/C++ Source or Header
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1993-09-09
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/* flonum_copy.c - copy a flonum
Copyright (C) 1987 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS 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 1, or (at your option)
any later version.
GAS 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 GAS; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <string.h>
#include "flonum.h"
void
flonum_copy(
FLONUM_TYPE *in,
FLONUM_TYPE *out)
{
int in_length; /* 0 origin */
int out_length; /* 0 origin */
out -> sign = in -> sign;
in_length = in -> leader - in -> low;
if (in_length < 0)
{
out -> leader = out -> low - 1; /* 0.0 case */
}
else
{
out_length = out -> high - out -> low;
/*
* Assume no GAPS in packing of littlenums.
* I.e. sizeof(array) == sizeof(element) * number_of_elements.
*/
if (in_length <= out_length)
{
{
/*
* For defensive programming, zero any high-order littlenums we don't need.
* This is destroying evidence and wasting time, so why bother???
*/
if (in_length < out_length)
{
memset((char *)(out->low + in_length + 1), '\0',
out_length - in_length);
}
}
memcpy((char *)(out->low), (char *)(in->low),
(int)((in_length + 1) * sizeof(LITTLENUM_TYPE)));
out -> exponent = in -> exponent;
out -> leader = in -> leader - in -> low + out -> low;
}
else
{
int shorten; /* 1-origin. Number of littlenums we drop. */
shorten = in_length - out_length;
/* Assume out_length >= 0 ! */
memcpy((char *)(out->low), (char *)(in->low + shorten),
(int)((out_length + 1) * sizeof(LITTLENUM_TYPE)));
out -> leader = out -> high;
out -> exponent = in -> exponent + shorten;
}
} /* if any significant bits */
}
/* end: flonum_copy.c */