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/* flonum_copy.c - copy a flonum
Copyright (C) 1987-2019 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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include "as.h"
void
flonum_copy (FLONUM_TYPE *in, FLONUM_TYPE *out)
{
unsigned int in_length; /* 0 origin */
unsigned int out_length; /* 0 origin */
out->sign = in->sign;
in_length = in->leader - in->low;
if (in->leader < in->low)
{
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 ((void *) (out->low), (void *) (in->low),
((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 ((void *) (out->low), (void *) (in->low + shorten),
((out_length + 1) * sizeof (LITTLENUM_TYPE)));
out->leader = out->high;
out->exponent = in->exponent + shorten;
}
} /* if any significant bits */
}
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