Mercurial > octave
annotate liboctave/util/lo-utils.cc @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
parents | b442ec6dda5c |
children | bd51beb6205e |
rev | line source |
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1967 | 1 /* |
2 | |
27919
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update Octave Project Developers copyright for the new year
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3 Copyright (C) 1996-2020 The Octave Project Developers |
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4 |
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5 See the file COPYRIGHT.md in the top-level directory of this distribution |
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6 or <https://octave.org/COPYRIGHT.html/>. |
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7 |
1967 | 8 |
9 This file is part of Octave. | |
10 | |
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11 Octave is free software: you can redistribute it and/or modify it |
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12 under the terms of the GNU General Public License as published by |
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13 the Free Software Foundation, either version 3 of the License, or |
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14 (at your option) any later version. |
1967 | 15 |
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16 Octave is distributed in the hope that it will be useful, but |
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17 WITHOUT ANY WARRANTY; without even the implied warranty of |
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18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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19 GNU General Public License for more details. |
1967 | 20 |
21 You should have received a copy of the GNU General Public License | |
7016 | 22 along with Octave; see the file COPYING. If not, see |
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23 <https://www.gnu.org/licenses/>. |
1967 | 24 |
25 */ | |
26 | |
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27 #if defined (HAVE_CONFIG_H) |
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28 # include "config.h" |
1967 | 29 #endif |
30 | |
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31 #include <cstdlib> |
7048 | 32 #include <cstring> |
1967 | 33 |
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34 #include <complex> |
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35 #include <istream> |
6490 | 36 #include <limits> |
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37 #include <ostream> |
2926 | 38 #include <string> |
39 | |
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40 #include "quit.h" |
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41 |
2926 | 42 #include "lo-error.h" |
4130 | 43 #include "lo-ieee.h" |
1967 | 44 #include "lo-mappers.h" |
45 #include "lo-utils.h" | |
46 | |
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47 bool xis_int_or_inf_or_nan (double x) |
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48 { return octave::math::isnan (x) || octave::math::x_nint (x) == x; } |
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49 |
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50 bool xis_one_or_zero (double x) |
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51 { return x == 0 || x == 1; } |
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52 |
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53 bool xis_zero (double x) |
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54 { return x == 0; } |
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55 |
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56 bool xtoo_large_for_float (double x) |
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57 { |
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58 return (octave::math::isfinite (x) |
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59 && fabs (x) > std::numeric_limits<float>::max ()); |
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60 } |
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61 |
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62 bool xtoo_large_for_float (const Complex& x) |
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63 { |
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64 return (xtoo_large_for_float (x.real ()) |
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65 || xtoo_large_for_float (x.imag ())); |
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66 } |
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67 |
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68 bool xis_int_or_inf_or_nan (float x) |
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69 { return octave::math::isnan (x) || octave::math::x_nint (x) == x; } |
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70 |
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71 bool xis_one_or_zero (float x) |
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72 { return x == 0 || x == 1; } |
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73 |
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74 bool xis_zero (float x) |
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75 { return x == 0; } |
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76 |
2926 | 77 // Save a string. |
78 | |
79 char * | |
80 strsave (const char *s) | |
81 { | |
82 if (! s) | |
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83 return nullptr; |
2926 | 84 |
85 int len = strlen (s); | |
86 char *tmp = new char [len+1]; | |
87 tmp = strcpy (tmp, s); | |
88 return tmp; | |
89 } | |
90 | |
3504 | 91 std::string |
2926 | 92 octave_fgets (FILE *f) |
93 { | |
4527 | 94 bool eof; |
95 return octave_fgets (f, eof); | |
96 } | |
97 | |
98 std::string | |
99 octave_fgets (FILE *f, bool& eof) | |
100 { | |
101 eof = false; | |
102 | |
3504 | 103 std::string retval; |
2926 | 104 |
105 int grow_size = 1024; | |
106 int max_size = grow_size; | |
107 | |
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108 char *buf = static_cast<char *> (std::malloc (max_size)); |
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109 if (! buf) |
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110 (*current_liboctave_error_handler) ("octave_fgets: unable to malloc %d bytes", max_size); |
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111 |
2926 | 112 char *bufptr = buf; |
113 int len = 0; | |
114 | |
115 do | |
116 { | |
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117 if (std::fgets (bufptr, grow_size, f)) |
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118 { |
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119 len = strlen (bufptr); |
2926 | 120 |
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121 if (len == grow_size - 1) |
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122 { |
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123 int tmp = bufptr - buf + grow_size - 1; |
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124 grow_size *= 2; |
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125 max_size += grow_size; |
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126 auto tmpbuf = static_cast<char *> (std::realloc (buf, max_size)); |
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127 if (! tmpbuf) |
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128 { |
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129 free (buf); |
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130 (*current_liboctave_error_handler) ("octave_fgets: unable to realloc %d bytes", max_size); |
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131 } |
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132 buf = tmpbuf; |
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133 bufptr = buf + tmp; |
2926 | 134 |
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135 if (*(bufptr-1) == '\n') |
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136 { |
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137 *bufptr = '\0'; |
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138 retval = buf; |
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139 } |
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140 } |
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141 else if (bufptr[len-1] != '\n') |
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142 { |
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143 bufptr[len++] = '\n'; |
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144 bufptr[len] = '\0'; |
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145 retval = buf; |
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146 } |
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147 else |
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148 retval = buf; |
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149 } |
2926 | 150 else |
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151 { |
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152 if (len == 0) |
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153 { |
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154 eof = true; |
4527 | 155 |
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156 free (buf); |
2926 | 157 |
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158 buf = nullptr; |
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159 } |
2926 | 160 |
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161 break; |
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162 } |
2926 | 163 } |
164 while (retval.empty ()); | |
165 | |
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166 free (buf); |
2926 | 167 |
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168 octave_quit (); |
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169 |
2926 | 170 return retval; |
171 } | |
172 | |
3970 | 173 std::string |
174 octave_fgetl (FILE *f) | |
175 { | |
4527 | 176 bool eof; |
177 return octave_fgetl (f, eof); | |
178 } | |
179 | |
180 std::string | |
181 octave_fgetl (FILE *f, bool& eof) | |
182 { | |
183 std::string retval = octave_fgets (f, eof); | |
3970 | 184 |
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185 if (! retval.empty () && retval.back () == '\n') |
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186 retval.pop_back (); |
3970 | 187 |
188 return retval; | |
189 } | |
190 | |
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191 // Note that the caller is responsible for repositioning the stream on failure. |
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192 |
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193 template <typename T> |
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194 T |
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195 read_inf_nan_na (std::istream& is, char c0) |
4130 | 196 { |
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197 T val = 0.0; |
4130 | 198 |
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199 switch (c0) |
4130 | 200 { |
201 case 'i': case 'I': | |
202 { | |
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203 char c1 = is.get (); |
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204 if (c1 == 'n' || c1 == 'N') |
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205 { |
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206 char c2 = is.get (); |
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207 if (c2 == 'f' || c2 == 'F') |
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208 val = std::numeric_limits<T>::infinity (); |
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209 else |
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210 is.setstate (std::ios::failbit); |
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211 } |
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212 else |
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213 is.setstate (std::ios::failbit); |
4130 | 214 } |
215 break; | |
216 | |
217 case 'n': case 'N': | |
218 { | |
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219 char c1 = is.get (); |
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220 if (c1 == 'a' || c1 == 'A') |
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221 { |
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222 char c2 = is.get (); |
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223 if (c2 == 'n' || c2 == 'N') |
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224 val = std::numeric_limits<T>::quiet_NaN (); |
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225 else |
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226 { |
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227 val = octave::numeric_limits<T>::NA (); |
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228 if (c2 != std::istream::traits_type::eof ()) |
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229 is.putback (c2); |
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230 else |
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231 is.clear (is.rdstate () & ~std::ios::failbit); |
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232 } |
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233 } |
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234 else |
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235 is.setstate (std::ios::failbit); |
4130 | 236 } |
237 break; | |
238 | |
239 default: | |
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240 (*current_liboctave_error_handler) |
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241 ("read_inf_nan_na: invalid character '%c'", c0); |
4130 | 242 } |
243 | |
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244 return val; |
4130 | 245 } |
246 | |
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247 // Read a double value. Discard any sign on NaN and NA. |
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248 |
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249 template <typename T> |
4130 | 250 double |
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251 octave_read_fp_value (std::istream& is) |
4130 | 252 { |
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253 T val = 0.0; |
4130 | 254 |
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255 // FIXME: resetting stream position is likely to fail unless we are |
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256 // reading from a file. |
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257 std::streampos pos = is.tellg (); |
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258 |
6907 | 259 char c1 = ' '; |
4130 | 260 |
6907 | 261 while (isspace (c1)) |
262 c1 = is.get (); | |
263 | |
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264 bool neg = false; |
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265 |
6194 | 266 switch (c1) |
4130 | 267 { |
6194 | 268 case '-': |
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269 neg = true; |
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270 OCTAVE_FALLTHROUGH; |
6194 | 271 |
272 case '+': | |
273 { | |
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274 char c2 = 0; |
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275 c2 = is.get (); |
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276 if (c2 == 'i' || c2 == 'I' || c2 == 'n' || c2 == 'N') |
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277 val = read_inf_nan_na<T> (is, c2); |
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278 else |
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279 { |
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280 is.putback (c2); |
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281 is >> val; |
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282 } |
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283 |
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284 if (neg && ! is.fail ()) |
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285 val = -val; |
6194 | 286 } |
287 break; | |
288 | |
4130 | 289 case 'i': case 'I': |
290 case 'n': case 'N': | |
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291 val = read_inf_nan_na<T> (is, c1); |
4130 | 292 break; |
293 | |
294 default: | |
6194 | 295 is.putback (c1); |
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296 is >> val; |
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297 break; |
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298 } |
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299 |
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300 std::ios::iostate status = is.rdstate (); |
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301 if (status & std::ios::failbit) |
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302 { |
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303 // Convert MAX_VAL returned by C++ streams for very large numbers to Inf |
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304 if (val == std::numeric_limits<T>::max ()) |
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305 { |
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306 if (neg) |
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307 val = -std::numeric_limits<T>::infinity (); |
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308 else |
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309 val = std::numeric_limits<T>::infinity (); |
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310 is.clear (status & ~std::ios::failbit); |
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311 } |
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312 else |
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313 { |
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314 // True error. Reset stream to original position and pass status on. |
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315 is.clear (); |
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316 is.seekg (pos); |
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317 is.setstate (status); |
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318 } |
4130 | 319 } |
320 | |
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321 return val; |
4130 | 322 } |
323 | |
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324 template <typename T> |
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325 std::complex<T> |
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326 octave_read_cx_fp_value (std::istream& is) |
4130 | 327 { |
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328 T re = 0.0; |
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329 T im = 0.0; |
4130 | 330 |
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331 std::complex<T> cx = 0.0; |
4130 | 332 |
6907 | 333 char ch = ' '; |
4130 | 334 |
6907 | 335 while (isspace (ch)) |
336 ch = is.get (); | |
4130 | 337 |
338 if (ch == '(') | |
339 { | |
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340 re = octave_read_value<T> (is); |
6897 | 341 ch = is.get (); |
4130 | 342 |
343 if (ch == ',') | |
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344 { |
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345 im = octave_read_value<T> (is); |
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346 ch = is.get (); |
4130 | 347 |
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348 if (ch == ')') |
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349 cx = std::complex<T> (re, im); |
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350 else |
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351 is.setstate (std::ios::failbit); |
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352 } |
4130 | 353 else if (ch == ')') |
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354 cx = re; |
4130 | 355 else |
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356 is.setstate (std::ios::failbit); |
4130 | 357 } |
358 else | |
359 { | |
360 is.putback (ch); | |
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361 cx = octave_read_value<double> (is); |
4130 | 362 } |
363 | |
364 return cx; | |
365 } | |
366 | |
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367 template <> OCTAVE_API double octave_read_value (std::istream& is) |
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368 { |
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369 return octave_read_fp_value<double> (is); |
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370 } |
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371 |
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372 template <> OCTAVE_API Complex octave_read_value (std::istream& is) |
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373 { |
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374 return octave_read_cx_fp_value<double> (is); |
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375 } |
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376 |
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377 template <> OCTAVE_API float octave_read_value (std::istream& is) |
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378 { |
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379 return octave_read_fp_value<float> (is); |
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380 } |
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381 |
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382 template <> OCTAVE_API FloatComplex octave_read_value (std::istream& is) |
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383 { |
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384 return octave_read_cx_fp_value<float> (is); |
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385 } |
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386 |
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387 void |
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388 octave_write_double (std::ostream& os, double d) |
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389 { |
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390 if (lo_ieee_is_NA (d)) |
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391 os << "NA"; |
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392 else if (lo_ieee_isnan (d)) |
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393 os << "NaN"; |
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394 else if (lo_ieee_isinf (d)) |
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395 os << (d < 0 ? "-Inf" : "Inf"); |
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396 else |
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397 os << d; |
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398 } |
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399 |
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400 void |
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401 octave_write_complex (std::ostream& os, const Complex& c) |
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402 { |
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403 os << '('; |
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404 octave_write_double (os, real (c)); |
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405 os << ','; |
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406 octave_write_double (os, imag (c)); |
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407 os << ')'; |
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408 } |
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409 |
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410 void |
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411 octave_write_float (std::ostream& os, float d) |
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412 { |
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413 if (lo_ieee_is_NA (d)) |
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414 os << "NA"; |
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415 else if (lo_ieee_isnan (d)) |
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416 os << "NaN"; |
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417 else if (lo_ieee_isinf (d)) |
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418 os << (d < 0 ? "-Inf" : "Inf"); |
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419 else |
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420 os << d; |
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421 } |
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422 |
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423 void |
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424 octave_write_float_complex (std::ostream& os, const FloatComplex& c) |
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425 { |
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426 os << '('; |
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427 octave_write_float (os, real (c)); |
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428 os << ','; |
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429 octave_write_float (os, imag (c)); |
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430 os << ')'; |
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431 } |