1 /* flonum_copy.c - copy a flonum 2 Copyright 1987, 1990, 1991, 1992, 1993, 2000 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 2, 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, 59 Temple Place - Suite 330, Boston, MA 20 02111-1307, 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