1/* flonum_copy.c - copy a flonum
2   Copyright (C) 1987-2020 Free Software Foundation, Inc.
3
4   This file is part of GAS, the GNU Assembler.
5
6   GAS is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 3, or (at your option)
9   any later version.
10
11   GAS is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with GAS; see the file COPYING.  If not, write to the Free
18   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
19   02110-1301, USA.  */
20
21#include "as.h"
22
23void
24flonum_copy (FLONUM_TYPE *in, FLONUM_TYPE *out)
25{
26  unsigned int in_length;	/* 0 origin */
27  unsigned int out_length;	/* 0 origin */
28
29  out->sign = in->sign;
30  in_length = in->leader - in->low;
31
32  if (in->leader < in->low)
33    {
34      out->leader = out->low - 1;	/* 0.0 case */
35    }
36  else
37    {
38      out_length = out->high - out->low;
39      /* Assume no GAPS in packing of littlenums.
40	 I.e. sizeof(array) == sizeof(element) * number_of_elements.  */
41      if (in_length <= out_length)
42	{
43	  {
44	    /* For defensive programming, zero any high-order
45	       littlenums we don't need.  This is destroying evidence
46	       and wasting time, so why bother???  */
47	    if (in_length < out_length)
48	      {
49		memset ((char *) (out->low + in_length + 1), '\0',
50			out_length - in_length);
51	      }
52	  }
53	  memcpy ((void *) (out->low), (void *) (in->low),
54		  ((in_length + 1) * sizeof (LITTLENUM_TYPE)));
55	  out->exponent = in->exponent;
56	  out->leader = in->leader - in->low + out->low;
57	}
58      else
59	{
60	  int shorten;		/* 1-origin. Number of littlenums we drop.  */
61
62	  shorten = in_length - out_length;
63	  /* Assume out_length >= 0 ! */
64	  memcpy ((void *) (out->low), (void *) (in->low + shorten),
65		  ((out_length + 1) * sizeof (LITTLENUM_TYPE)));
66	  out->leader = out->high;
67	  out->exponent = in->exponent + shorten;
68	}
69    }				/* if any significant bits */
70}
71