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  1. /* flonum_copy.c - copy a flonum
  2.    Copyright (C) 1987-2015 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.  
  23. void
  24. flonum_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.