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1 /* |
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2 |
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3 Copyright (C) 2002 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 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 Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <float.h> |
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28 #include <math.h> |
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29 |
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30 #if defined (HAVE_FLOATINGPOINT_H) |
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31 #include <floatingpoint.h> |
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32 #endif |
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33 |
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34 #if defined (HAVE_IEEEFP_H) |
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35 #include <ieeefp.h> |
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36 #endif |
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37 |
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38 #if defined (HAVE_NAN_H) |
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39 #if defined (SCO) |
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40 #define _IEEE 1 |
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41 #endif |
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42 #include <nan.h> |
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43 #if defined (SCO) |
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44 #undef _IEEE |
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45 #endif |
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46 #endif |
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47 |
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48 #include "lo-ieee.h" |
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49 |
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50 #if defined (_AIX) && defined (__GNUG__) |
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51 #undef finite |
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52 #define finite(x) ((x) < DBL_MAX && (x) > -DBL_MAX) |
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53 #endif |
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54 |
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55 #if defined (SCO) |
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56 |
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57 int |
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58 isnan (double x) |
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59 { |
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60 return (IsNANorINF (x) && NaN (x) && ! IsINF (x)) ? 1 : 0; |
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61 } |
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62 |
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63 int |
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64 isinf (double x) |
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65 { |
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66 return (IsNANorINF (x) && IsINF (x)) ? 1 : 0; |
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67 } |
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68 |
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69 #endif |
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70 |
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71 int |
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72 lo_ieee_isnan (double x) |
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73 { |
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74 #if defined (HAVE_ISNAN) |
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75 return isnan (x) ? ! lo_ieee_is_NA (x) : 0; |
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76 #else |
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77 return 0; |
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78 #endif |
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79 } |
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80 |
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81 int |
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82 lo_ieee_finite (double x) |
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83 { |
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84 #if defined (HAVE_FINITE) |
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85 return finite (x) != 0 && ! lo_ieee_is_NaN_or_NA (x); |
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86 #elif defined (HAVE_ISINF) |
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87 return (! isinf (x) && ! lo_ieee_is_NaN_or_NA (x)); |
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88 #else |
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89 return ! lo_ieee_is_NaN_or_NA (x); |
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90 #endif |
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91 } |
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92 |
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93 int |
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94 lo_ieee_isinf (double x) |
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95 { |
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96 #if defined (HAVE_ISINF) |
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97 return isinf (x); |
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98 #elif defined (HAVE_FINITE) |
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99 return (! (finite (x) || lo_ieee_is_NaN_or_NA (x))); |
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100 #else |
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101 return 0; |
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102 #endif |
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103 } |
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104 |
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105 int |
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106 lo_ieee_is_NA (double x) |
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107 { |
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108 lo_ieee_double t; |
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109 t.value = x; |
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110 return (isnan (x) && t.word[lo_ieee_lw] == LO_IEEE_NA_LW) ? 1 : 0; |
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111 } |
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112 |
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113 int |
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114 lo_ieee_is_NaN_or_NA (double x) |
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115 { |
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116 return lo_ieee_isnan (x); |
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117 } |
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118 |
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119 /* |
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120 ;;; Local Variables: *** |
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121 ;;; mode: C++ *** |
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122 ;;; End: *** |
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123 */ |
