gas/flonum-copy.c

   1 /* flonum_copy.c - copy a flonum
   2    Copyright (C) 1987, 1990, 1991 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 1, 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
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* static const char rcsid[] = "$Id$"; */
  21
  22 #include "as.h"
  23
  24 #ifdef USG
  25 #define bzero(s,n) memset(s,0,n)
  26 #define bcopy(from,to,n) memcpy(to,from,n)
  27 #endif
  28
  29 void
  30 flonum_copy (in, out)
  31      FLONUM_TYPE *      in;
  32      FLONUM_TYPE *      out;
  33 {
  34   int                   in_length;      /* 0 origin */
  35   int                   out_length;     /* 0 origin */
  36
  37   out -> sign = in -> sign;
  38   in_length = in  -> leader - in -> low;
  39   if (in_length < 0)
  40     {
  41       out -> leader = out -> low - 1; /* 0.0 case */
  42     }
  43   else
  44     {
  45       out_length = out -> high - out -> low;
  46       /*
  47        * Assume no GAPS in packing of littlenums.
  48        * I.e. sizeof(array) == sizeof(element) * number_of_elements.
  49        */
  50       if (in_length <= out_length)
  51         {
  52           {
  53             /*
  54              * For defensive programming, zero any high-order littlenums we don't need.
  55              * This is destroying evidence and wasting time, so why bother???
  56              */
  57             if (in_length < out_length)
  58               {
  59                 bzero ((char *)(out->low + in_length + 1), out_length - in_length);
  60               }
  61           }
  62           bcopy ((char *)(in->low), (char *)(out->low), (int)((in_length + 1) * sizeof(LITTLENUM_TYPE)));
  63           out -> exponent = in -> exponent;
  64           out -> leader   = in -> leader - in -> low + out -> low;
  65         }
  66       else
  67         {
  68           int   shorten;                /* 1-origin. Number of littlenums we drop. */
  69
  70           shorten = in_length - out_length;
  71           /* Assume out_length >= 0 ! */
  72           bcopy ((char *)(in->low + shorten),(char *)( out->low), (int)((out_length + 1) * sizeof(LITTLENUM_TYPE)));
  73           out -> leader = out -> high;
  74           out -> exponent = in -> exponent + shorten;
  75         }
  76     }                           /* if any significant bits */
  77 }
  78
  79 /* end: flonum_copy.c */