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1 // utils.cc |
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2 /* |
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3 |
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4 Copyright (C) 1996, 1997, 2000, 2002, 2003, 2004, 2005, 2006, 2007 |
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5 John W. Eaton |
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1967
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6 |
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7 This file is part of Octave. |
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8 |
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9 Octave is free software; you can redistribute it and/or modify it |
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10 under the terms of the GNU General Public License as published by the |
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11 Free Software Foundation; either version 3 of the License, or (at your |
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12 option) any later version. |
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13 |
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14 Octave is distributed in the hope that it will be useful, but WITHOUT |
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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17 for more details. |
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18 |
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19 You should have received a copy of the GNU General Public License |
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20 along with Octave; see the file COPYING. If not, see |
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21 <http://www.gnu.org/licenses/>. |
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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 <cctype> |
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30 #include <cstdlib> |
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31 #include <cstdio> |
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32 #include <cstring> |
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33 |
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34 #include <limits> |
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35 #include <string> |
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36 |
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37 #ifdef HAVE_UNISTD_H |
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38 #ifdef HAVE_SYS_TYPES_H |
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39 #include <sys/types.h> |
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40 #endif |
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41 #include <unistd.h> |
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42 #endif |
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43 |
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44 #include "lo-error.h" |
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45 #include "lo-ieee.h" |
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46 #include "lo-mappers.h" |
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47 #include "lo-utils.h" |
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48 |
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49 // Convert X to the nearest integer value. Should not pass NaN to |
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50 // this function. |
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51 |
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52 // Sometimes you need a large integer, but not always. |
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53 |
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54 octave_idx_type |
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55 NINTbig (double x) |
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56 { |
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57 if (x > std::numeric_limits<octave_idx_type>::max ()) |
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58 return std::numeric_limits<octave_idx_type>::max (); |
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59 else if (x < std::numeric_limits<octave_idx_type>::min ()) |
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60 return std::numeric_limits<octave_idx_type>::min (); |
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61 else |
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62 return static_cast<octave_idx_type> ((x > 0) ? (x + 0.5) : (x - 0.5)); |
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63 } |
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64 |
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65 int |
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66 NINT (double x) |
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67 { |
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68 if (x > std::numeric_limits<int>::max ()) |
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69 return std::numeric_limits<int>::max (); |
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70 else if (x < std::numeric_limits<int>::min ()) |
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71 return std::numeric_limits<int>::min (); |
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72 else |
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73 return static_cast<int> ((x > 0) ? (x + 0.5) : (x - 0.5)); |
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74 } |
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75 |
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76 double |
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77 D_NINT (double x) |
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78 { |
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79 if (xisinf (x) || xisnan (x)) |
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80 return x; |
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81 else |
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82 return floor (x + 0.5); |
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83 } |
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84 |
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85 // Save a string. |
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86 |
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87 char * |
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88 strsave (const char *s) |
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89 { |
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90 if (! s) |
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91 return 0; |
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92 |
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93 int len = strlen (s); |
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94 char *tmp = new char [len+1]; |
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95 tmp = strcpy (tmp, s); |
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96 return tmp; |
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97 } |
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98 |
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99 // This function was adapted from xputenv from Karl Berry's kpathsearch |
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100 // library. |
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101 |
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102 // FIXME -- make this do the right thing if we don't have a |
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103 // SMART_PUTENV. |
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104 |
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105 void |
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106 octave_putenv (const std::string& name, const std::string& value) |
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107 { |
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108 int new_len = name.length () + value.length () + 2; |
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109 |
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110 char *new_item = static_cast<char*> (malloc (new_len)); |
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111 |
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112 sprintf (new_item, "%s=%s", name.c_str (), value.c_str ()); |
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113 |
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114 // As far as I can see there's no way to distinguish between the |
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115 // various errors; putenv doesn't have errno values. |
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116 |
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117 if (putenv (new_item) < 0) |
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118 (*current_liboctave_error_handler) ("putenv (%s) failed", new_item); |
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119 } |
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120 |
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121 std::string |
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122 octave_fgets (FILE *f) |
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123 { |
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124 bool eof; |
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125 return octave_fgets (f, eof); |
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126 } |
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127 |
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128 std::string |
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129 octave_fgets (FILE *f, bool& eof) |
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130 { |
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131 eof = false; |
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132 |
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133 std::string retval; |
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134 |
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135 int grow_size = 1024; |
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136 int max_size = grow_size; |
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137 |
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138 char *buf = static_cast<char *> (malloc (max_size)); |
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139 char *bufptr = buf; |
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140 int len = 0; |
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141 |
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142 do |
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143 { |
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144 if (fgets (bufptr, grow_size, f)) |
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145 { |
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146 len = strlen (bufptr); |
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147 |
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148 if (len == grow_size - 1) |
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149 { |
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150 int tmp = bufptr - buf + grow_size - 1; |
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151 grow_size *= 2; |
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152 max_size += grow_size; |
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153 buf = static_cast<char *> (realloc (buf, max_size)); |
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154 bufptr = buf + tmp; |
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155 |
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156 if (*(bufptr-1) == '\n') |
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157 { |
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158 *bufptr = '\0'; |
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159 retval = buf; |
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160 } |
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161 } |
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162 else if (bufptr[len-1] != '\n') |
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163 { |
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164 bufptr[len++] = '\n'; |
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165 bufptr[len] = '\0'; |
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166 retval = buf; |
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167 } |
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168 else |
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169 retval = buf; |
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170 } |
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171 else |
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172 { |
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173 if (len == 0) |
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174 { |
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175 eof = true; |
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176 |
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177 free (buf); |
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178 |
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179 buf = 0; |
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180 } |
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181 |
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182 break; |
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183 } |
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184 } |
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185 while (retval.empty ()); |
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186 |
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187 if (buf) |
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188 free (buf); |
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189 |
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190 return retval; |
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191 } |
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192 |
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193 std::string |
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194 octave_fgetl (FILE *f) |
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195 { |
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196 bool eof; |
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197 return octave_fgetl (f, eof); |
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198 } |
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199 |
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200 std::string |
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201 octave_fgetl (FILE *f, bool& eof) |
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202 { |
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203 std::string retval = octave_fgets (f, eof); |
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204 |
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205 size_t len = retval.length (); |
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206 |
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207 if (retval[len-1] == '\n') |
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208 retval.resize (len-1); |
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209 |
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210 return retval; |
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211 } |
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212 |
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213 static inline double |
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214 read_inf_nan_na (std::istream& is, char c, char sign = '+') |
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215 { |
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216 double d = 0.0; |
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217 |
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218 switch (c) |
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219 { |
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220 case 'i': case 'I': |
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221 { |
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222 c = is.get (); |
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223 if (c == 'n' || c == 'N') |
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224 { |
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225 c = is.get (); |
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226 if (c == 'f' || c == 'F') |
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227 d = sign == '-' ? -octave_Inf : octave_Inf; |
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228 else |
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229 is.putback (c); |
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230 } |
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231 else |
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232 is.putback (c); |
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233 } |
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234 break; |
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235 |
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236 case 'n': case 'N': |
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237 { |
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238 c = is.get (); |
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239 if (c == 'a' || c == 'A') |
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240 { |
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241 c = is.get (); |
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242 if (c == 'n' || c == 'N') |
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243 d = octave_NaN; |
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244 else |
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245 { |
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246 is.putback (c); |
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247 d = octave_NA; |
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248 } |
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249 } |
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250 else |
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251 is.putback (c); |
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252 } |
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253 break; |
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254 |
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255 default: |
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256 abort (); |
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257 } |
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258 |
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259 return d; |
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260 } |
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261 |
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262 double |
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263 octave_read_double (std::istream& is) |
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264 { |
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265 double d = 0.0; |
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266 |
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267 char c1 = ' '; |
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268 |
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269 while (isspace (c1)) |
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270 c1 = is.get (); |
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271 |
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272 switch (c1) |
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273 { |
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274 case '-': |
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275 { |
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276 char c2 = 0; |
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277 c2 = is.get (); |
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278 if (c2 == 'i' || c2 == 'I') |
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279 d = read_inf_nan_na (is, c2, c1); |
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280 else |
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281 { |
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282 is.putback (c2); |
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283 is.putback (c1); |
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284 is >> d; |
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285 } |
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286 } |
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287 break; |
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288 |
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289 case '+': |
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290 { |
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291 char c2 = 0; |
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292 c2 = is.get (); |
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293 if (c2 == 'i' || c2 == 'I') |
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294 d = read_inf_nan_na (is, c2, c1); |
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295 else |
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296 { |
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297 is.putback (c2); |
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298 is.putback (c1); |
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299 is >> d; |
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300 } |
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301 } |
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302 break; |
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303 |
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304 case 'i': case 'I': |
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305 case 'n': case 'N': |
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306 d = read_inf_nan_na (is, c1); |
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307 break; |
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308 |
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309 default: |
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310 is.putback (c1); |
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311 is >> d; |
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312 } |
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313 |
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314 return d; |
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315 } |
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316 |
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317 Complex |
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318 octave_read_complex (std::istream& is) |
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319 { |
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320 double re = 0.0, im = 0.0; |
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321 |
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322 Complex cx = 0.0; |
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323 |
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324 char ch = ' '; |
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325 |
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326 while (isspace (ch)) |
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327 ch = is.get (); |
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328 |
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329 if (ch == '(') |
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330 { |
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331 re = octave_read_double (is); |
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332 ch = is.get (); |
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333 |
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334 if (ch == ',') |
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335 { |
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336 im = octave_read_double (is); |
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337 ch = is.get (); |
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338 |
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339 if (ch == ')') |
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340 cx = Complex (re, im); |
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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 if (ch == ')') |
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345 cx = re; |
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346 else |
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347 is.setstate (std::ios::failbit); |
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348 } |
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349 else |
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350 { |
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351 is.putback (ch); |
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352 cx = octave_read_double (is); |
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353 } |
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354 |
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355 return cx; |
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356 |
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357 } |
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358 |
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359 void |
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360 octave_write_double (std::ostream& os, double d) |
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361 { |
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362 if (lo_ieee_is_NA (d)) |
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363 os << "NA"; |
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364 else if (lo_ieee_isnan (d)) |
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365 os << "NaN"; |
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366 else if (lo_ieee_isinf (d)) |
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367 os << (d < 0 ? "-Inf" : "Inf"); |
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368 else |
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369 os << d; |
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370 } |
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371 |
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372 void |
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373 octave_write_complex (std::ostream& os, const Complex& c) |
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374 { |
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375 os << "("; |
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376 octave_write_double (os, real (c)); |
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377 os << ","; |
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378 octave_write_double (os, imag (c)); |
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379 os << ")"; |
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380 } |
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381 |
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382 /* |
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383 ;;; Local Variables: *** |
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384 ;;; mode: C++ *** |
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385 ;;; End: *** |
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386 */ |
