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[binutils.git] / gas / flonum-copy.c
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1 /* flonum_copy.c - copy a flonum
2 Copyright 1987, 1990, 1991, 1992, 1993, 2000, 2003, 2005, 2007
3 Free Software Foundation, Inc.
5 This file is part of GAS, the GNU Assembler.
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 3, or (at your option)
10 any later version.
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.
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. */
22 #include "as.h"
24 void
25 flonum_copy (FLONUM_TYPE *in, FLONUM_TYPE *out)
27 unsigned int in_length; /* 0 origin */
28 unsigned int out_length; /* 0 origin */
30 out->sign = in->sign;
31 in_length = in->leader - in->low;
33 if (in->leader < in->low)
35 out->leader = out->low - 1; /* 0.0 case */
37 else
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)
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)
50 memset ((char *) (out->low + in_length + 1), '\0',
51 out_length - in_length);
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;
59 else
61 int shorten; /* 1-origin. Number of littlenums we drop. */
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;
70 } /* if any significant bits */