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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.
  4.  
  5.    This file is part of GAS, the GNU Assembler.
  6.  
  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.
  11.  
  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.
  16.  
  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.  */
  21.  
  22. #include "as.h"
  23.  
  24. void
  25. flonum_copy (FLONUM_TYPE *in, FLONUM_TYPE *out)
  26. {
  27.   unsigned int in_length;       /* 0 origin */
  28.   unsigned int out_length;      /* 0 origin */
  29.  
  30.   out->sign = in->sign;
  31.   in_length = in->leader - in->low;
  32.  
  33.   if (in->leader < in->low)
  34.     {
  35.       out->leader = out->low - 1;       /* 0.0 case */
  36.     }
  37.   else
  38.     {
  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)
  43.         {
  44.           {
  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)
  49.               {
  50.                 memset ((char *) (out->low + in_length + 1), '\0',
  51.                         out_length - in_length);
  52.               }
  53.           }
  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;
  58.         }
  59.       else
  60.         {
  61.           int shorten;          /* 1-origin. Number of littlenums we drop.  */
  62.  
  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;
  69.         }
  70.     }                           /* if any significant bits */
  71. }
  72.