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1 // sun-utils.h -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (_sun_utils_h) |
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25 #define _sun_utils_h 1 |
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26 |
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27 #ifdef __GNUG__ |
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28 #pragma interface |
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29 #endif |
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30 |
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31 #ifdef sun |
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32 |
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33 /* |
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34 * I think that this is really only needed if linking to Fortran |
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35 * compiled libraries on a Sun. It should never be called. |
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36 * There should probably be a sysdep.cc file, eh? |
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37 */ |
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38 |
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39 extern "C" int MAIN_ (void); |
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40 |
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41 /* |
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42 * This is only needed to dereference pointers to doubles if mixing |
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43 * GCC and Sun f77/cc compiled code. See the GCC manual (where the |
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44 * function access_double() is described) and the Sun f77 manual, |
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45 * which explains that doubles are not always aligned on 8 byte |
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46 * boundaries. |
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47 */ |
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48 |
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49 #ifdef __GNUC__ |
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50 |
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51 inline double |
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52 access_double (double *unaligned_ptr) |
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53 { |
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54 union d2i { double d; int i[2]; }; |
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55 |
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56 union d2i *p = (union d2i *) unaligned_ptr; |
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57 union d2i u; |
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58 |
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59 u.i[0] = p->i[0]; |
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60 u.i[1] = p->i[1]; |
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61 |
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62 return u.d; |
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63 } |
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64 |
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65 inline void |
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66 assign_double (double *unaligned_ptr, double value) |
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67 { |
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68 union d2i { double d; int i[2]; }; |
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69 |
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70 double *ptr = &value; |
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71 union d2i *v = (union d2i *) ptr; |
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72 union d2i *p = (union d2i *) unaligned_ptr; |
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73 |
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74 p->i[0] = v->i[0]; |
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75 p->i[1] = v->i[1]; |
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76 } |
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77 |
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78 #endif |
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79 |
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80 #endif |
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81 |
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82 #endif |
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83 |
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84 /* |
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85 ;;; Local Variables: *** |
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86 ;;; mode: C++ *** |
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87 ;;; page-delimiter: "^/\\*" *** |
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88 ;;; End: *** |
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89 */ |
