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1993
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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 <climits> |
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2926
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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 <string> |
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33 |
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34 #ifdef HAVE_UNISTD_H |
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35 #ifdef HAVE_SYS_TYPES_H |
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36 #include <sys/types.h> |
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37 #endif |
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38 #include <unistd.h> |
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39 #endif |
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40 |
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41 #include "lo-error.h" |
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42 #include "lo-ieee.h" |
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43 #include "lo-mappers.h" |
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44 #include "lo-utils.h" |
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45 |
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46 // Convert X to the nearest integer value. Should not pass NaN to |
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47 // this function. |
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48 |
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49 int |
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50 NINT (double x) |
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51 { |
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52 if (x > INT_MAX) |
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53 return INT_MAX; |
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54 else if (x < INT_MIN) |
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55 return INT_MIN; |
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56 else |
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57 return (x > 0) ? ((int) (x + 0.5)) : ((int) (x - 0.5)); |
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58 } |
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59 |
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60 double |
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61 D_NINT (double x) |
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62 { |
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63 if (xisinf (x) || xisnan (x)) |
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64 return x; |
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65 else |
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66 return floor (x + 0.5); |
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67 } |
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68 |
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69 // Save a string. |
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70 |
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71 char * |
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72 strsave (const char *s) |
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73 { |
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74 if (! s) |
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75 return 0; |
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76 |
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77 int len = strlen (s); |
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78 char *tmp = new char [len+1]; |
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79 tmp = strcpy (tmp, s); |
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80 return tmp; |
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81 } |
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82 |
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83 // This function was adapted from xputenv from Karl Berry's kpathsearch |
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84 // library. |
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85 |
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86 // XXX FIXME XXX -- make this do the right thing if we don't have a |
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87 // SMART_PUTENV. |
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88 |
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89 void |
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90 octave_putenv (const std::string& name, const std::string& value) |
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91 { |
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92 int new_len = name.length () + value.length () + 2; |
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93 |
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94 char *new_item = static_cast<char*> (malloc (new_len)); |
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95 |
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96 sprintf (new_item, "%s=%s", name.c_str (), value.c_str ()); |
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97 |
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98 // As far as I can see there's no way to distinguish between the |
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99 // various errors; putenv doesn't have errno values. |
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100 |
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101 if (putenv (new_item) < 0) |
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102 (*current_liboctave_error_handler) ("putenv (%s) failed", new_item); |
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103 } |
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104 |
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105 std::string |
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106 octave_fgets (FILE *f) |
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107 { |
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108 std::string retval; |
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109 |
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110 int grow_size = 1024; |
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111 int max_size = grow_size; |
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112 |
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113 char *buf = static_cast<char *> (malloc (max_size)); |
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114 char *bufptr = buf; |
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115 int len = 0; |
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116 |
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117 do |
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118 { |
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119 if (fgets (bufptr, grow_size, f)) |
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120 { |
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121 len = strlen (bufptr); |
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122 |
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123 if (len == grow_size - 1) |
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124 { |
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125 int tmp = bufptr - buf + grow_size - 1; |
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126 grow_size *= 2; |
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127 max_size += grow_size; |
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128 buf = static_cast<char *> (realloc (buf, max_size)); |
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129 bufptr = buf + tmp; |
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130 |
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131 if (*(bufptr-1) == '\n') |
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132 { |
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133 *bufptr = '\0'; |
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134 retval = buf; |
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135 } |
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136 } |
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137 else if (bufptr[len-1] != '\n') |
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138 { |
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139 bufptr[len++] = '\n'; |
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140 bufptr[len] = '\0'; |
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141 retval = buf; |
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142 } |
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143 else |
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144 retval = buf; |
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145 } |
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146 else |
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147 { |
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148 if (len == 0) |
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149 { |
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150 free (buf); |
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151 |
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152 buf = 0; |
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153 } |
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154 |
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155 break; |
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156 } |
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157 } |
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158 while (retval.empty ()); |
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159 |
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160 if (buf) |
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161 free (buf); |
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162 |
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163 return retval; |
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164 } |
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165 |
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166 std::string |
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167 octave_fgetl (FILE *f) |
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168 { |
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169 std::string retval = octave_fgets (f); |
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170 |
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171 size_t len = retval.length (); |
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172 |
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173 if (retval[len-1] == '\n') |
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174 retval.resize (len-1); |
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175 |
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176 return retval; |
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177 } |
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178 |
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179 static inline double |
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180 read_inf_nan_na (std::istream& is, char c) |
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181 { |
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182 double d = 0.0; |
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183 |
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184 switch (c) |
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185 { |
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186 case 'i': case 'I': |
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187 { |
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188 is >> c; |
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189 if (c == 'n' || c == 'N') |
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190 { |
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191 is >> c; |
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192 if (c == 'f' || c == 'F') |
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193 d = octave_Inf; |
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194 else |
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195 is.putback (c); |
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196 } |
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197 else |
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198 is.putback (c); |
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199 } |
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200 break; |
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201 |
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202 case 'n': case 'N': |
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203 { |
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204 is >> c; |
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205 if (c == 'a' || c == 'A') |
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206 { |
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207 is >> c; |
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208 if (c == 'n' || c == 'N') |
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209 d = octave_NaN; |
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210 else |
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211 { |
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212 is.putback (c); |
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213 d = octave_NA; |
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214 } |
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215 } |
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216 else |
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217 is.putback (c); |
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218 } |
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219 break; |
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220 |
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221 default: |
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222 abort (); |
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223 } |
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224 |
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225 return d; |
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226 } |
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227 |
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228 double |
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229 octave_read_double (std::istream& is) |
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230 { |
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231 double d = 0.0; |
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232 |
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233 char c = 0; |
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234 |
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235 is >> c; |
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236 switch (c) |
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237 { |
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238 case 'i': case 'I': |
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239 case 'n': case 'N': |
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240 d = read_inf_nan_na (is, c); |
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241 break; |
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242 |
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243 default: |
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244 is.putback (c); |
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245 is >> d; |
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246 } |
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247 |
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248 return d; |
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249 } |
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250 |
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251 Complex |
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252 octave_read_complex (std::istream& is) |
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253 { |
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254 double re = 0.0, im = 0.0; |
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255 |
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256 Complex cx = 0.0; |
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257 |
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258 char ch = 0; |
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259 |
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260 is >> ch; |
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261 |
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262 if (ch == '(') |
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263 { |
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264 re = octave_read_double (is); |
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265 is >> ch; |
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266 |
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267 if (ch == ',') |
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268 { |
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269 im = octave_read_double (is); |
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270 is >> ch; |
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271 |
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272 if (ch == ')') |
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273 cx = Complex (re, im); |
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274 else |
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275 is.setstate (std::ios::failbit); |
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276 } |
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277 else if (ch == ')') |
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278 cx = re; |
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279 else |
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280 is.setstate (std::ios::failbit); |
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281 } |
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282 else |
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283 { |
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284 is.putback (ch); |
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285 cx = octave_read_double (is); |
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286 } |
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287 |
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288 return cx; |
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289 |
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290 } |
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291 |
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292 void |
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293 octave_write_double (std::ostream& os, double d) |
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294 { |
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295 if (lo_ieee_is_NA (d)) |
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296 os << "NA"; |
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297 else if (lo_ieee_isnan (d)) |
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298 os << "NaN"; |
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299 else if (lo_ieee_isinf (d)) |
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300 os << (d < 0 ? "-Inf" : "Inf"); |
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301 else |
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302 os << d; |
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303 } |
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304 |
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305 void |
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306 octave_write_complex (std::ostream& os, const Complex& c) |
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307 { |
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308 os << "("; |
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309 octave_write_double (os, real (c)); |
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310 os << ","; |
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311 octave_write_double (os, imag (c)); |
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312 os << ")"; |
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313 } |
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314 |
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315 /* |
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316 ;;; Local Variables: *** |
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317 ;;; mode: C++ *** |
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318 ;;; End: *** |
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319 */ |
