1 /* flonum_copy.c - copy a flonum 2 Copyright (C) 1987-2016 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