/* flonum_copy.c - copy a flonum
  Copyright (C) 1987-2024 Free Software Foundation, Inc.

  This file is part of GAS, the GNU Assembler.

  GAS is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 3, or (at your option)
  any later version.

  GAS is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with GAS; see the file COPYING.  If not, write to the Free
  Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  02110-1301, USA.  */

#include "as.h"

void
flonum_copy (FLONUM_TYPE *in, FLONUM_TYPE *out)
{
 unsigned int in_length;       /* 0 origin */
 unsigned int out_length;      /* 0 origin */

 out->sign = in->sign;
 in_length = in->leader - in->low;

 if (in->leader < in->low)
   {
     out->leader = out->low - 1;       /* 0.0 case */
   }
 else
   {
     out_length = out->high - out->low;
     /* Assume no GAPS in packing of littlenums.
        I.e. sizeof(array) == sizeof(element) * number_of_elements.  */
     if (in_length <= out_length)
       {
         {
           /* For defensive programming, zero any high-order
              littlenums we don't need.  This is destroying evidence
              and wasting time, so why bother???  */
           if (in_length < out_length)
             {
               memset ((char *) (out->low + in_length + 1), '\0',
                       out_length - in_length);
             }
         }
         memcpy ((void *) (out->low), (void *) (in->low),
                 ((in_length + 1) * sizeof (LITTLENUM_TYPE)));
         out->exponent = in->exponent;
         out->leader = in->leader - in->low + out->low;
       }
     else
       {
         int shorten;          /* 1-origin. Number of littlenums we drop.  */

         shorten = in_length - out_length;
         /* Assume out_length >= 0 ! */
         memcpy ((void *) (out->low), (void *) (in->low + shorten),
                 ((out_length + 1) * sizeof (LITTLENUM_TYPE)));
         out->leader = out->high;
         out->exponent = in->exponent + shorten;
       }
   }                           /* if any significant bits */
}