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1 /* |
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2 |
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3 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 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 3 of the License, or (at your |
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10 option) any 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, see |
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19 <http://www.gnu.org/licenses/>. |
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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 |
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29 #if defined (HAVE_FLOATINGPOINT_H) |
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30 #include <floatingpoint.h> |
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31 #endif |
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32 |
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33 #if defined (HAVE_IEEEFP_H) |
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34 #include <ieeefp.h> |
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35 #endif |
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36 |
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37 #if defined (HAVE_NAN_H) |
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38 #if defined (SCO) |
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39 #define _IEEE 1 |
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40 #endif |
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41 #include <nan.h> |
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42 #if defined (SCO) |
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43 #undef _IEEE |
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44 #endif |
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45 #endif |
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46 |
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47 #include "lo-ieee.h" |
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48 #include "lo-math.h" |
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49 |
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50 #if ! defined (HAVE_ISNAN) && defined (HAVE__ISNAN) |
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51 #define isnan _isnan |
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52 #define HAVE_ISNAN 1 |
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53 #endif |
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54 |
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55 #if ! defined (HAVE_FINITE) && defined (HAVE__FINITE) |
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56 #define finite _finite |
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57 #define HAVE_FINITE 1 |
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58 #endif |
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59 |
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60 #if ! defined (HAVE_COPYSIGN) && defined (HAVE__COPYSIGN) |
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61 #define copysign _copysign |
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62 #define HAVE_COPYSIGN 1 |
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63 #endif |
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64 |
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65 #if defined (_AIX) && defined (__GNUG__) |
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66 #undef finite |
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67 #define finite(x) ((x) < DBL_MAX && (x) > -DBL_MAX) |
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68 #endif |
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69 |
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70 /* Octave's idea of infinity. */ |
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71 double octave_Inf; |
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72 |
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73 /* Octave's idea of a missing value. */ |
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74 double octave_NA; |
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75 |
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76 /* Octave's idea of not a number. */ |
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77 double octave_NaN; |
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78 |
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79 int lo_ieee_hw; |
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80 int lo_ieee_lw; |
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81 |
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82 #if defined (SCO) |
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83 |
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84 int |
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85 isnan (double x) |
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86 { |
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87 return (IsNANorINF (x) && NaN (x) && ! IsINF (x)) ? 1 : 0; |
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88 } |
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89 |
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90 int |
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91 isinf (double x) |
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92 { |
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93 return (IsNANorINF (x) && IsINF (x)) ? 1 : 0; |
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94 } |
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95 |
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96 #endif |
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97 |
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98 int |
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99 lo_ieee_isnan (double x) |
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100 { |
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101 #if defined (HAVE_ISNAN) |
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102 return isnan (x); |
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103 #else |
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104 return 0; |
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105 #endif |
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106 } |
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107 |
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108 int |
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109 lo_ieee_finite (double x) |
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110 { |
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111 #if defined (HAVE_FINITE) |
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112 return finite (x) != 0 && ! lo_ieee_isnan (x); |
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113 #elif defined (HAVE_ISINF) |
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114 return (! isinf (x) && ! lo_ieee_isnan (x)); |
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115 #else |
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116 return ! lo_ieee_isnan (x); |
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117 #endif |
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118 } |
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119 |
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120 int |
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121 lo_ieee_isinf (double x) |
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122 { |
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123 #if defined (HAVE_ISINF) |
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124 return isinf (x); |
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125 #elif defined (HAVE_FINITE) |
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126 return (! (finite (x) || lo_ieee_isnan (x))); |
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127 #else |
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128 return 0; |
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129 #endif |
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130 } |
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131 |
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132 int |
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133 lo_ieee_is_NA (double x) |
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134 { |
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135 #if defined (HAVE_ISNAN) |
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136 lo_ieee_double t; |
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137 t.value = x; |
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138 return (isnan (x) && t.word[lo_ieee_lw] == LO_IEEE_NA_LW) ? 1 : 0; |
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139 #else |
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140 return 0; |
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141 #endif |
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142 } |
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143 |
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144 int |
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145 lo_ieee_is_NaN_or_NA (double x) |
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146 { |
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147 return lo_ieee_isnan (x); |
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148 } |
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149 |
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150 double |
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151 lo_ieee_inf_value (void) |
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152 { |
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153 return octave_Inf; |
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154 } |
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155 |
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156 double |
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157 lo_ieee_na_value (void) |
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158 { |
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159 return octave_NA; |
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160 } |
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161 |
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162 double |
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163 lo_ieee_nan_value (void) |
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164 { |
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165 return octave_NaN; |
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166 } |
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167 |
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168 #if ! (defined (signbit) || defined (HAVE_DECL_SIGNBIT)) && defined (HAVE_SIGNBIT) |
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169 extern int signbit (double); |
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170 #endif |
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171 |
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172 int |
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173 lo_ieee_signbit (double x) |
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174 { |
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175 /* In the following definitions, only check x < 0 explicitly to avoid |
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176 a function call when it looks like signbit or copysign are actually |
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177 functions. */ |
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178 |
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179 #if defined (signbit) |
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180 return signbit (x); |
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181 #elif defined (HAVE_SIGNBIT) |
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182 return (x < 0 || signbit (x)); |
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183 #elif defined (copysign) |
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184 return (copysign (1.0, x) < 0); |
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185 #elif defined (HAVE_COPYSIGN) |
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186 return (x < 0 || copysign (1.0, x) < 0); |
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187 #else |
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188 return x < 0; |
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189 #endif |
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190 } |
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191 |
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192 /* |
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193 ;;; Local Variables: *** |
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194 ;;; mode: C++ *** |
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195 ;;; End: *** |
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196 */ |
