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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 /* Octave's idea of infinity. */ |
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56 double octave_Inf; |
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57 |
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58 /* Octave's idea of a missing value. */ |
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59 double octave_NA; |
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60 |
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61 /* Octave's idea of not a number. */ |
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62 double octave_NaN; |
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63 |
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64 int lo_ieee_hw; |
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65 int lo_ieee_lw; |
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66 |
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67 #if defined (SCO) |
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68 |
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69 int |
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70 isnan (double x) |
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71 { |
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72 return (IsNANorINF (x) && NaN (x) && ! IsINF (x)) ? 1 : 0; |
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73 } |
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74 |
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75 int |
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76 isinf (double x) |
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77 { |
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78 return (IsNANorINF (x) && IsINF (x)) ? 1 : 0; |
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79 } |
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80 |
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81 #endif |
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82 |
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83 int |
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84 lo_ieee_isnan (double x) |
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85 { |
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86 #if defined (HAVE_ISNAN) |
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87 return isnan (x) ? ! lo_ieee_is_NA (x) : 0; |
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88 #else |
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89 return 0; |
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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_finite (double x) |
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95 { |
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96 #if defined (HAVE_FINITE) |
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97 return finite (x) != 0 && ! lo_ieee_is_NaN_or_NA (x); |
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98 #elif defined (HAVE_ISINF) |
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99 return (! isinf (x) && ! lo_ieee_is_NaN_or_NA (x)); |
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100 #else |
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101 return ! lo_ieee_is_NaN_or_NA (x); |
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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_isinf (double x) |
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107 { |
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108 #if defined (HAVE_ISINF) |
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109 return isinf (x); |
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110 #elif defined (HAVE_FINITE) |
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111 return (! (finite (x) || lo_ieee_is_NaN_or_NA (x))); |
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112 #else |
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113 return 0; |
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114 #endif |
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115 } |
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116 |
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117 int |
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118 lo_ieee_is_NA (double x) |
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119 { |
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120 #if defined HAVE_ISNAN |
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121 lo_ieee_double t; |
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122 t.value = x; |
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123 return (isnan (x) && t.word[lo_ieee_lw] == LO_IEEE_NA_LW) ? 1 : 0; |
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124 #else |
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125 return 0; |
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126 #endif |
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127 } |
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128 |
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129 int |
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130 lo_ieee_is_NaN_or_NA (double x) |
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131 { |
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132 /* Although NA really is an IEEE NaN value, lo_ieee_isnan pretends |
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133 it is not, so we much check both... */ |
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134 |
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135 return lo_ieee_isnan (x) || lo_ieee_is_NA (x); |
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136 } |
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137 |
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138 double |
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139 lo_ieee_inf_value (void) |
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140 { |
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141 return octave_Inf; |
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142 } |
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143 |
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144 double |
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145 lo_ieee_na_value (void) |
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146 { |
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147 return octave_NA; |
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148 } |
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149 |
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150 double |
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151 lo_ieee_nan_value (void) |
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152 { |
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153 return octave_NaN; |
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154 } |
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155 |
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156 #if ! (defined (signbit) || defined (HAVE_DECL_SIGNBIT)) && defined (HAVE_SIGNBIT) |
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157 extern int signbit (double); |
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158 #endif |
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159 |
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160 int |
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161 lo_ieee_signbit (double x) |
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162 { |
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163 /* In the following definitions, only check x < 0 explicitly to avoid |
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164 a function call when it looks like signbit or copysign are actually |
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165 functions. */ |
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166 |
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167 #if defined (signbit) |
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168 return signbit (x); |
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169 #elif defined (HAVE_SIGNBIT) |
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170 return (x < 0 || signbit (x)); |
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171 #elif defined (copysign) |
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172 return (copysign (1.0, x) < 0); |
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173 #elif defined (HAVE_COPYSIGN) |
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174 return (x < 0 || copysign (1.0, x) < 0); |
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175 #else |
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176 return x < 0; |
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177 #endif |
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178 } |
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179 |
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180 /* |
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181 ;;; Local Variables: *** |
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182 ;;; mode: C++ *** |
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183 ;;; End: *** |
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184 */ |
