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82415fc6 C |
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 */ |