1/* flonum_copy.c - copy a flonum
2   Copyright 1987, 1990, 1991, 1992, 1993, 2000, 2003
3   Free Software Foundation, Inc.
4
5   This file is part of GAS, the GNU Assembler.
6
7   GAS is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 2, or (at your option)
10   any later version.
11
12   GAS is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with GAS; see the file COPYING.  If not, write to the Free
19   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
20   02110-1301, USA.  */
21
22#include "as.h"
23
24void
25flonum_copy (FLONUM_TYPE *in, FLONUM_TYPE *out)
26{
27  unsigned int in_length;	/* 0 origin */
28  unsigned int out_length;	/* 0 origin */
29
30  out->sign = in->sign;
31  in_length = in->leader - in->low;
32
33  if (in->leader < in->low)
34    {
35      out->leader = out->low - 1;	/* 0.0 case */
36    }
37  else
38    {
39      out_length = out->high - out->low;
40      /* Assume no GAPS in packing of littlenums.
41	 I.e. sizeof(array) == sizeof(element) * number_of_elements.  */
42      if (in_length <= out_length)
43	{
44	  {
45	    /* For defensive programming, zero any high-order
46	       littlenums we don't need.  This is destroying evidence
47	       and wasting time, so why bother???  */
48	    if (in_length < out_length)
49	      {
50		memset ((char *) (out->low + in_length + 1), '\0',
51			out_length - in_length);
52	      }
53	  }
54	  memcpy ((void *) (out->low), (void *) (in->low),
55		  ((in_length + 1) * sizeof (LITTLENUM_TYPE)));
56	  out->exponent = in->exponent;
57	  out->leader = in->leader - in->low + out->low;
58	}
59      else
60	{
61	  int shorten;		/* 1-origin. Number of littlenums we drop.  */
62
63	  shorten = in_length - out_length;
64	  /* Assume out_length >= 0 ! */
65	  memcpy ((void *) (out->low), (void *) (in->low + shorten),
66		  ((out_length + 1) * sizeof (LITTLENUM_TYPE)));
67	  out->leader = out->high;
68	  out->exponent = in->exponent + shorten;
69	}
70    }				/* if any significant bits */
71}
72