projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 7b374118 NW |
1 | /* flonum_copy.c - copy a flonum |
| 2 | Copyright (C) 1987 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 | #include "flonum.h" | |
| 21 | #ifdef USG | |
| 22 | #define bzero(s,n) memset(s,0,n) | |
| 23 | #define bcopy(from,to,n) memcpy(to,from,n) | |
| 24 | #endif | |
| 25 | ||
| 26 | void | |
| 27 | flonum_copy (in, out) | |
| 28 | FLONUM_TYPE * in; | |
| 29 | FLONUM_TYPE * out; | |
| 30 | { | |
| 31 | int in_length; /* 0 origin */ | |
| 32 | int out_length; /* 0 origin */ | |
| 33 | ||
| 34 | out -> sign = in -> sign; | |
| 35 | in_length = in -> leader - in -> low; | |
| 36 | if (in_length < 0) | |
| 37 | { | |
| 38 | out -> leader = out -> low - 1; /* 0.0 case */ | |
| 39 | } | |
| 40 | else | |
| 41 | { | |
| 42 | out_length = out -> high - out -> low; | |
| 43 | /* | |
| 44 | * Assume no GAPS in packing of littlenums. | |
| 45 | * I.e. sizeof(array) == sizeof(element) * number_of_elements. | |
| 46 | */ | |
| 47 | if (in_length <= out_length) | |
| 48 | { | |
| 49 | { | |
| 50 | /* | |
| 51 | * For defensive programming, zero any high-order littlenums we don't need. | |
| 52 | * This is destroying evidence and wasting time, so why bother??? | |
| 53 | */ | |
| 54 | if (in_length < out_length) | |
| 55 | { | |
| 56 | bzero ((char *)(out->low + in_length + 1), out_length - in_length); | |
| 57 | } | |
| 58 | } | |
| 59 | bcopy ((char *)(in->low), (char *)(out->low), (int)((in_length + 1) * sizeof(LITTLENUM_TYPE))); | |
| 60 | out -> exponent = in -> exponent; | |
| 61 | out -> leader = in -> leader - in -> low + out -> low; | |
| 62 | } | |
| 63 | else | |
| 64 | { | |
| 65 | int shorten; /* 1-origin. Number of littlenums we drop. */ | |
| 66 | ||
| 67 | shorten = in_length - out_length; | |
| 68 | /* Assume out_length >= 0 ! */ | |
| 69 | bcopy ((char *)(in->low + shorten),(char *)( out->low), (int)((out_length + 1) * sizeof(LITTLENUM_TYPE))); | |
| 70 | out -> leader = out -> high; | |
| 71 | out -> exponent = in -> exponent + shorten; | |
| 72 | } | |
| 73 | } /* if any significant bits */ | |
| 74 | } | |
| 75 | ||
| 76 | /* end: flonum_copy.c */ |