1 | /* flonum_copy.c - copy a flonum |
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2 | Copyright 1987, 1990, 1991, 1992, 1993, 2000 |
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3 | Free Software Foundation, Inc. |
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4 | |
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5 | This file is part of GAS, the GNU Assembler. |
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6 | |
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7 | GAS is free software; you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation; either version 2, or (at your option) |
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10 | any later version. |
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11 | |
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12 | GAS is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |
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17 | You should have received a copy of the GNU General Public License |
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18 | along with GAS; see the file COPYING. If not, write to the Free |
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19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
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20 | 02111-1307, USA. */ |
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21 | |
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22 | #include "as.h" |
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23 | |
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24 | void |
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25 | flonum_copy (in, out) |
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26 | FLONUM_TYPE *in; |
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27 | FLONUM_TYPE *out; |
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28 | { |
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29 | unsigned int in_length; /* 0 origin */ |
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30 | unsigned int out_length; /* 0 origin */ |
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31 | |
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32 | out->sign = in->sign; |
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33 | in_length = in->leader - in->low; |
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34 | |
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35 | if (in->leader < in->low) |
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36 | { |
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37 | out->leader = out->low - 1; /* 0.0 case */ |
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38 | } |
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39 | else |
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40 | { |
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41 | out_length = out->high - out->low; |
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42 | /* Assume no GAPS in packing of littlenums. |
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43 | I.e. sizeof(array) == sizeof(element) * number_of_elements. */ |
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44 | if (in_length <= out_length) |
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45 | { |
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46 | { |
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47 | /* For defensive programming, zero any high-order |
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48 | littlenums we don't need. This is destroying evidence |
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49 | and wasting time, so why bother??? */ |
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50 | if (in_length < out_length) |
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51 | { |
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52 | memset ((char *) (out->low + in_length + 1), '\0', |
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53 | out_length - in_length); |
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54 | } |
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55 | } |
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56 | memcpy ((void *) (out->low), (void *) (in->low), |
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57 | ((in_length + 1) * sizeof (LITTLENUM_TYPE))); |
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58 | out->exponent = in->exponent; |
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59 | out->leader = in->leader - in->low + out->low; |
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60 | } |
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61 | else |
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62 | { |
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63 | int shorten; /* 1-origin. Number of littlenums we drop. */ |
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64 | |
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65 | shorten = in_length - out_length; |
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66 | /* Assume out_length >= 0 ! */ |
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67 | memcpy ((void *) (out->low), (void *) (in->low + shorten), |
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68 | ((out_length + 1) * sizeof (LITTLENUM_TYPE))); |
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69 | out->leader = out->high; |
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70 | out->exponent = in->exponent + shorten; |
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71 | } |
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72 | } /* if any significant bits */ |
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73 | } |
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