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1 // utils.cc |
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1967
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2 /* |
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3 |
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4 Copyright (C) 1996, 1997 John W. Eaton |
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1967
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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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21 02110-1301, USA. |
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22 |
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23 */ |
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24 |
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25 #ifdef HAVE_CONFIG_H |
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26 #include <config.h> |
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27 #endif |
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28 |
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29 #include <cstdlib> |
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30 #include <cstdio> |
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31 |
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32 #include <limits> |
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33 #include <string> |
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34 |
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35 #ifdef HAVE_UNISTD_H |
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36 #ifdef HAVE_SYS_TYPES_H |
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37 #include <sys/types.h> |
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38 #endif |
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39 #include <unistd.h> |
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40 #endif |
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41 |
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42 #include "lo-error.h" |
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43 #include "lo-ieee.h" |
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44 #include "lo-mappers.h" |
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45 #include "lo-utils.h" |
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46 |
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47 // Convert X to the nearest integer value. Should not pass NaN to |
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48 // this function. |
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49 |
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50 // Sometimes you need a large integer, but not always. |
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51 |
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52 octave_idx_type |
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53 NINTbig (double x) |
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54 { |
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55 if (x > std::numeric_limits<octave_idx_type>::max ()) |
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56 return std::numeric_limits<octave_idx_type>::max (); |
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57 else if (x < std::numeric_limits<octave_idx_type>::min ()) |
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58 return std::numeric_limits<octave_idx_type>::min (); |
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59 else |
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60 return static_cast<octave_idx_type> ((x > 0) ? (x + 0.5) : (x - 0.5)); |
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61 } |
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62 |
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63 int |
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64 NINT (double x) |
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65 { |
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66 if (x > std::numeric_limits<int>::max ()) |
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67 return std::numeric_limits<int>::max (); |
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68 else if (x < std::numeric_limits<int>::min ()) |
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69 return std::numeric_limits<int>::min (); |
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70 else |
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71 return static_cast<int> ((x > 0) ? (x + 0.5) : (x - 0.5)); |
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72 } |
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73 |
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74 double |
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75 D_NINT (double x) |
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76 { |
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77 if (xisinf (x) || xisnan (x)) |
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78 return x; |
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79 else |
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80 return floor (x + 0.5); |
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81 } |
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82 |
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83 // Save a string. |
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84 |
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85 char * |
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86 strsave (const char *s) |
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87 { |
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88 if (! s) |
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89 return 0; |
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90 |
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91 int len = strlen (s); |
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92 char *tmp = new char [len+1]; |
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93 tmp = strcpy (tmp, s); |
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94 return tmp; |
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95 } |
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96 |
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97 // This function was adapted from xputenv from Karl Berry's kpathsearch |
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98 // library. |
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99 |
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100 // FIXME -- make this do the right thing if we don't have a |
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101 // SMART_PUTENV. |
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102 |
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103 void |
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104 octave_putenv (const std::string& name, const std::string& value) |
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105 { |
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106 int new_len = name.length () + value.length () + 2; |
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107 |
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108 char *new_item = static_cast<char*> (malloc (new_len)); |
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109 |
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110 sprintf (new_item, "%s=%s", name.c_str (), value.c_str ()); |
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111 |
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112 // As far as I can see there's no way to distinguish between the |
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113 // various errors; putenv doesn't have errno values. |
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114 |
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115 if (putenv (new_item) < 0) |
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116 (*current_liboctave_error_handler) ("putenv (%s) failed", new_item); |
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117 } |
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118 |
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119 std::string |
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120 octave_fgets (FILE *f) |
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121 { |
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122 bool eof; |
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123 return octave_fgets (f, eof); |
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124 } |
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125 |
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126 std::string |
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127 octave_fgets (FILE *f, bool& eof) |
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128 { |
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129 eof = false; |
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130 |
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131 std::string retval; |
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132 |
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133 int grow_size = 1024; |
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134 int max_size = grow_size; |
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135 |
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136 char *buf = static_cast<char *> (malloc (max_size)); |
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137 char *bufptr = buf; |
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138 int len = 0; |
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139 |
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140 do |
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141 { |
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142 if (fgets (bufptr, grow_size, f)) |
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143 { |
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144 len = strlen (bufptr); |
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145 |
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146 if (len == grow_size - 1) |
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147 { |
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148 int tmp = bufptr - buf + grow_size - 1; |
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149 grow_size *= 2; |
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150 max_size += grow_size; |
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151 buf = static_cast<char *> (realloc (buf, max_size)); |
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152 bufptr = buf + tmp; |
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153 |
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154 if (*(bufptr-1) == '\n') |
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155 { |
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156 *bufptr = '\0'; |
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157 retval = buf; |
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158 } |
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159 } |
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160 else if (bufptr[len-1] != '\n') |
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161 { |
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162 bufptr[len++] = '\n'; |
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163 bufptr[len] = '\0'; |
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164 retval = buf; |
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165 } |
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166 else |
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167 retval = buf; |
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168 } |
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169 else |
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170 { |
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171 if (len == 0) |
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172 { |
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173 eof = true; |
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174 |
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175 free (buf); |
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176 |
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177 buf = 0; |
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178 } |
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179 |
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180 break; |
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181 } |
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182 } |
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183 while (retval.empty ()); |
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184 |
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185 if (buf) |
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186 free (buf); |
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187 |
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188 return retval; |
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189 } |
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190 |
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191 std::string |
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192 octave_fgetl (FILE *f) |
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193 { |
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194 bool eof; |
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195 return octave_fgetl (f, eof); |
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196 } |
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197 |
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198 std::string |
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199 octave_fgetl (FILE *f, bool& eof) |
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200 { |
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201 std::string retval = octave_fgets (f, eof); |
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202 |
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203 size_t len = retval.length (); |
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204 |
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205 if (retval[len-1] == '\n') |
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206 retval.resize (len-1); |
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207 |
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208 return retval; |
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209 } |
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210 |
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211 static inline double |
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212 read_inf_nan_na (std::istream& is, char c, char sign = '+') |
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213 { |
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214 double d = 0.0; |
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215 |
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216 switch (c) |
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217 { |
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218 case 'i': case 'I': |
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219 { |
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220 is >> c; |
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221 if (c == 'n' || c == 'N') |
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222 { |
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223 is >> c; |
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224 if (c == 'f' || c == 'F') |
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225 d = sign == '-' ? -octave_Inf : octave_Inf; |
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226 else |
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227 is.putback (c); |
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228 } |
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229 else |
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230 is.putback (c); |
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231 } |
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232 break; |
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233 |
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234 case 'n': case 'N': |
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235 { |
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236 is >> c; |
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237 if (c == 'a' || c == 'A') |
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238 { |
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239 is >> c; |
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240 if (c == 'n' || c == 'N') |
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241 d = octave_NaN; |
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242 else |
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243 { |
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244 is.putback (c); |
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245 d = octave_NA; |
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246 } |
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247 } |
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248 else |
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249 is.putback (c); |
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250 } |
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251 break; |
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252 |
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253 default: |
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254 abort (); |
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255 } |
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256 |
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257 return d; |
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258 } |
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259 |
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260 double |
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261 octave_read_double (std::istream& is) |
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262 { |
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263 double d = 0.0; |
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264 |
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265 char c1 = 0; |
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266 |
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267 is >> c1; |
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268 switch (c1) |
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269 { |
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270 case '-': |
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271 { |
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272 char c2 = 0; |
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273 is >> c2; |
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274 if (c2 == 'i' || c2 == 'I') |
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275 d = read_inf_nan_na (is, c2, c1); |
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276 else |
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277 { |
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278 is.putback (c2); |
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279 is.putback (c1); |
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280 is >> d; |
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281 } |
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282 } |
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283 break; |
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284 |
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285 case '+': |
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286 { |
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287 char c2 = 0; |
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288 is >> c2; |
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289 if (c2 == 'i' || c2 == 'I') |
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290 d = read_inf_nan_na (is, c2, c1); |
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291 else |
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292 { |
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293 is.putback (c2); |
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294 is.putback (c1); |
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295 is >> d; |
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296 } |
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297 } |
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298 break; |
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299 |
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300 case 'i': case 'I': |
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301 case 'n': case 'N': |
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302 d = read_inf_nan_na (is, c1); |
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303 break; |
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304 |
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305 default: |
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306 is.putback (c1); |
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307 is >> d; |
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308 } |
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309 |
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310 return d; |
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311 } |
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312 |
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313 Complex |
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314 octave_read_complex (std::istream& is) |
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315 { |
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316 double re = 0.0, im = 0.0; |
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317 |
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318 Complex cx = 0.0; |
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319 |
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320 char ch = 0; |
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321 |
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322 is >> ch; |
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323 |
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324 if (ch == '(') |
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325 { |
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326 re = octave_read_double (is); |
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327 is >> ch; |
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328 |
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329 if (ch == ',') |
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330 { |
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331 im = octave_read_double (is); |
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332 is >> ch; |
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333 |
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334 if (ch == ')') |
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335 cx = Complex (re, im); |
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336 else |
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337 is.setstate (std::ios::failbit); |
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338 } |
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339 else if (ch == ')') |
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340 cx = re; |
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341 else |
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342 is.setstate (std::ios::failbit); |
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343 } |
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344 else |
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345 { |
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346 is.putback (ch); |
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347 cx = octave_read_double (is); |
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348 } |
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349 |
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350 return cx; |
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351 |
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352 } |
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353 |
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354 void |
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355 octave_write_double (std::ostream& os, double d) |
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356 { |
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357 if (lo_ieee_is_NA (d)) |
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358 os << "NA"; |
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359 else if (lo_ieee_isnan (d)) |
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360 os << "NaN"; |
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361 else if (lo_ieee_isinf (d)) |
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362 os << (d < 0 ? "-Inf" : "Inf"); |
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363 else |
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364 os << d; |
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365 } |
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366 |
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367 void |
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368 octave_write_complex (std::ostream& os, const Complex& c) |
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369 { |
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370 os << "("; |
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371 octave_write_double (os, real (c)); |
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372 os << ","; |
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373 octave_write_double (os, imag (c)); |
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374 os << ")"; |
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375 } |
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376 |
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377 /* |
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378 ;;; Local Variables: *** |
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379 ;;; mode: C++ *** |
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380 ;;; End: *** |
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381 */ |
