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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include <float.h> |
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29 #include <math.h> |
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30 |
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31 #if defined (HAVE_FLOATINGPOINT_H) |
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32 #include <floatingpoint.h> |
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33 #endif |
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34 |
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35 #if defined (HAVE_IEEEFP_H) |
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36 #include <ieeefp.h> |
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37 #endif |
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38 |
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39 #if defined (HAVE_NAN_H) |
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40 #if defined (SCO) |
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41 #define _IEEE 1 |
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42 #endif |
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43 #include <nan.h> |
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44 #if defined (SCO) |
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45 #undef _IEEE |
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46 #endif |
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47 #endif |
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48 |
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49 #include "lo-ieee.h" |
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50 |
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51 #if ! defined (HAVE_ISNAN) && defined (HAVE__ISNAN) |
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52 #define isnan _isnan |
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53 #define HAVE_ISNAN 1 |
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54 #endif |
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55 |
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56 #if ! defined (HAVE_FINITE) && defined (HAVE__FINITE) |
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57 #define finite _finite |
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58 #define HAVE_FINITE 1 |
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59 #endif |
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60 |
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61 #if ! defined (HAVE_COPYSIGN) && defined (HAVE__COPYSIGN) |
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62 #define copysign _copysign |
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63 #define HAVE_COPYSIGN 1 |
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64 #endif |
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65 |
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66 #if defined (_AIX) && defined (__GNUG__) |
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67 #undef finite |
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68 #define finite(x) ((x) < DBL_MAX && (x) > -DBL_MAX) |
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69 #endif |
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70 |
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71 /* Octave's idea of infinity. */ |
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72 double octave_Inf; |
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73 |
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74 /* Octave's idea of a missing value. */ |
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75 double octave_NA; |
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76 |
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77 /* Octave's idea of not a number. */ |
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78 double octave_NaN; |
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79 |
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80 int lo_ieee_hw; |
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81 int lo_ieee_lw; |
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82 |
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83 #if defined (SCO) |
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84 |
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85 int |
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86 isnan (double x) |
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87 { |
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88 return (IsNANorINF (x) && NaN (x) && ! IsINF (x)) ? 1 : 0; |
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89 } |
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90 |
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91 int |
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92 isinf (double x) |
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93 { |
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94 return (IsNANorINF (x) && IsINF (x)) ? 1 : 0; |
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95 } |
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96 |
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97 #endif |
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98 |
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99 int |
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100 lo_ieee_isnan (double x) |
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101 { |
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102 #if defined (HAVE_ISNAN) |
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103 return isnan (x); |
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104 #else |
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105 return 0; |
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106 #endif |
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107 } |
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108 |
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109 int |
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110 lo_ieee_finite (double x) |
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111 { |
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112 #if defined (HAVE_FINITE) |
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113 return finite (x) != 0 && ! lo_ieee_isnan (x); |
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114 #elif defined (HAVE_ISINF) |
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115 return (! isinf (x) && ! lo_ieee_isnan (x)); |
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116 #else |
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117 return ! lo_ieee_isnan (x); |
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118 #endif |
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119 } |
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120 |
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121 int |
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122 lo_ieee_isinf (double x) |
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123 { |
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124 #if defined (HAVE_ISINF) |
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125 return isinf (x); |
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126 #elif defined (HAVE_FINITE) |
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127 return (! (finite (x) || lo_ieee_isnan (x))); |
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128 #else |
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129 return 0; |
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130 #endif |
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131 } |
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132 |
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133 int |
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134 lo_ieee_is_NA (double x) |
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135 { |
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136 #if defined (HAVE_ISNAN) |
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137 lo_ieee_double t; |
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138 t.value = x; |
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139 return (isnan (x) && t.word[lo_ieee_lw] == LO_IEEE_NA_LW) ? 1 : 0; |
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140 #else |
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141 return 0; |
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142 #endif |
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143 } |
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144 |
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145 int |
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146 lo_ieee_is_NaN_or_NA (double x) |
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147 { |
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148 return lo_ieee_isnan (x); |
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149 } |
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150 |
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151 double |
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152 lo_ieee_inf_value (void) |
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153 { |
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154 return octave_Inf; |
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155 } |
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156 |
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157 double |
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158 lo_ieee_na_value (void) |
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159 { |
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160 return octave_NA; |
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161 } |
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162 |
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163 double |
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164 lo_ieee_nan_value (void) |
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165 { |
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166 return octave_NaN; |
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167 } |
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168 |
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169 #if ! (defined (signbit) || defined (HAVE_DECL_SIGNBIT)) && defined (HAVE_SIGNBIT) |
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170 extern int signbit (double); |
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171 #endif |
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172 |
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173 int |
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174 lo_ieee_signbit (double x) |
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175 { |
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176 /* In the following definitions, only check x < 0 explicitly to avoid |
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177 a function call when it looks like signbit or copysign are actually |
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178 functions. */ |
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179 |
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180 #if defined (signbit) |
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181 return signbit (x); |
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182 #elif defined (HAVE_SIGNBIT) |
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183 return (x < 0 || signbit (x)); |
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184 #elif defined (copysign) |
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185 return (copysign (1.0, x) < 0); |
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186 #elif defined (HAVE_COPYSIGN) |
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187 return (x < 0 || copysign (1.0, x) < 0); |
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188 #else |
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189 return x < 0; |
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190 #endif |
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191 } |
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192 |
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193 /* |
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194 ;;; Local Variables: *** |
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195 ;;; mode: C++ *** |
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196 ;;; End: *** |
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197 */ |
