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78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/* flonum_copy.c - copy a flonum
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Copyright (C) 1987, 1990, 1991 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 2, 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
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "as.h"
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#ifdef USG
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#define bzero(s,n) memset(s,0,n)
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#define bcopy(from,to,n) memcpy(to,from,n)
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#endif
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void
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flonum_copy (in, out)
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FLONUM_TYPE * in;
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FLONUM_TYPE * out;
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{
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int in_length; /* 0 origin */
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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_length < 0)
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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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/*
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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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*/
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if (in_length <= out_length)
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{
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{
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/*
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* For defensive programming, zero any high-order littlenums we don't need.
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* This is destroying evidence and wasting time, so why bother???
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*/
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if (in_length < out_length)
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{
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bzero ((char *)(out->low + in_length + 1), out_length - in_length);
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}
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}
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bcopy ((char *)(in->low), (char *)(out->low), (int)((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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bcopy ((char *)(in->low + shorten),(char *)( out->low), (int)((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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/* end of flonum_copy.c */
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