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71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/* flonum_copy.c - copy a flonum
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Copyright (C) 1987-2017 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "as.h"
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void
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flonum_copy (FLONUM_TYPE *in, FLONUM_TYPE *out)
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{
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unsigned int in_length; /* 0 origin */
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unsigned int out_length; /* 0 origin */
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out->sign = in->sign;
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in_length = in->leader - in->low;
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if (in->leader < in->low)
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{
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out->leader = out->low - 1; /* 0.0 case */
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}
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else
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{
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out_length = out->high - out->low;
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/* Assume no GAPS in packing of littlenums.
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I.e. sizeof(array) == sizeof(element) * number_of_elements. */
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if (in_length <= out_length)
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{
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{
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/* For defensive programming, zero any high-order
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littlenums we don't need. This is destroying evidence
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and wasting time, so why bother??? */
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if (in_length < out_length)
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{
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memset ((char *) (out->low + in_length + 1), '\0',
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out_length - in_length);
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}
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}
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memcpy ((void *) (out->low), (void *) (in->low),
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((in_length + 1) * sizeof (LITTLENUM_TYPE)));
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out->exponent = in->exponent;
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out->leader = in->leader - in->low + out->low;
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}
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else
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{
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int shorten; /* 1-origin. Number of littlenums we drop. */
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shorten = in_length - out_length;
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/* Assume out_length >= 0 ! */
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memcpy ((void *) (out->low), (void *) (in->low + shorten),
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((out_length + 1) * sizeof (LITTLENUM_TYPE)));
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out->leader = out->high;
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out->exponent = in->exponent + shorten;
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}
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} /* if any significant bits */
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}
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