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