Mercurial > octave
annotate libinterp/corefcn/oct-stream.h @ 27735:8600f5ea1ec1
use std::shared_ptr to manage stream rep
* oct-stream.h, oct-stream.cc (base_stream::m_count): Delete member
variable and all uses.
(class graphics_toolkit): Use default copy constructor, assignment
operator, and destructor.
(base_stream::m_rep): Declare as std::shared_ptr<base_stream> instead
of using bare pointer.
author | John W. Eaton <jwe@octave.org> |
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date | Thu, 21 Nov 2019 19:23:20 -0600 |
parents | 396996f1dad0 |
children | 61cc648ab034 |
rev | line source |
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2117 | 1 /* |
2 | |
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3 Copyright (C) 1996-2019 John W. Eaton |
2117 | 4 |
5 This file is part of Octave. | |
6 | |
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7 Octave is free software: you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by |
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9 the Free Software Foundation, either version 3 of the License, or |
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10 (at your option) any later version. |
2117 | 11 |
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12 Octave is distributed in the hope that it will be useful, but |
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13 WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 GNU General Public License for more details. |
2117 | 16 |
17 You should have received a copy of the GNU General Public License | |
7016 | 18 along with Octave; see the file COPYING. If not, see |
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19 <https://www.gnu.org/licenses/>. |
2117 | 20 |
21 */ | |
22 | |
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23 #if ! defined (octave_oct_stream_h) |
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24 #define octave_oct_stream_h 1 |
2117 | 25 |
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26 #include "octave-config.h" |
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27 |
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28 #include <ios> |
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29 #include <iosfwd> |
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30 #include <list> |
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31 #include <map> |
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32 #include <memory> |
2877 | 33 #include <string> |
2117 | 34 |
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35 // These only appear as reference arguments or return values. |
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36 |
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37 template <typename T> class Array; |
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38 class Cell; |
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39 class octave_value; |
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40 class octave_value_list; |
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41 class string_vector; |
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42 |
2317 | 43 #include "data-conv.h" |
44 #include "mach-info.h" | |
2117 | 45 |
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46 namespace octave |
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47 { |
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48 class interpreter; |
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49 |
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50 // These are only needed as arguments to private functions, so they |
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51 // are also treated as private. |
2117 | 52 |
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53 class scanf_format_elt; |
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54 class scanf_format_list; |
2117 | 55 |
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56 class printf_format_elt; |
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57 class printf_format_list; |
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58 |
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59 // Provide an interface for Octave streams. |
2117 | 60 |
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61 class |
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62 OCTINTERP_API |
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63 base_stream |
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64 { |
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65 friend class stream; |
2117 | 66 |
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67 public: |
2117 | 68 |
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69 base_stream (std::ios::openmode arg_md = std::ios::in | std::ios::out, |
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70 mach_info::float_format ff = mach_info::native_float_format (), |
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71 const std::string& encoding = "utf-8") |
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72 : m_mode (arg_md), m_flt_fmt (ff), m_encoding (encoding), |
27172 | 73 m_fail (false), m_open_state (true), m_errmsg () |
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74 { } |
2117 | 75 |
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76 // No copying! |
2117 | 77 |
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78 base_stream (const base_stream&) = delete; |
2117 | 79 |
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80 base_stream& operator = (const base_stream&) = delete; |
2117 | 81 |
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82 virtual ~base_stream (void) = default; |
2117 | 83 |
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84 // The remaining functions are not specific to input or output only, |
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85 // and must be provided by the derived classes. |
2117 | 86 |
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87 // Position a stream at OFFSET relative to ORIGIN. |
2117 | 88 |
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89 virtual int seek (off_t offset, int origin) = 0; |
2117 | 90 |
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91 // Return current stream position. |
2117 | 92 |
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93 virtual off_t tell (void) = 0; |
2117 | 94 |
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95 // Return TRUE if EOF has been reached on this stream. |
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96 |
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97 virtual bool eof (void) const = 0; |
2117 | 98 |
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99 // The name of the file. |
2117 | 100 |
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101 virtual std::string name (void) const = 0; |
2117 | 102 |
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103 // If the derived class provides this function and it returns a |
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104 // pointer to a valid istream, scanf(), read(), getl(), and gets() |
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105 // will automatically work for this stream. |
2117 | 106 |
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107 virtual std::istream * input_stream (void) { return nullptr; } |
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109 // If the derived class provides this function and it returns a |
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110 // pointer to a valid ostream, flush(), write(), and printf() will |
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111 // automatically work for this stream. |
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113 virtual std::ostream * output_stream (void) { return nullptr; } |
3652 | 114 |
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115 // Return TRUE if this stream is open. |
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116 |
27172 | 117 bool is_open (void) const { return m_open_state; } |
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118 |
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119 virtual void do_close (void) { } |
3340 | 120 |
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121 void close (void) |
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122 { |
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123 if (is_open ()) |
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124 { |
27172 | 125 m_open_state = false; |
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126 do_close (); |
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127 } |
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128 } |
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129 |
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130 virtual int file_number (void) const |
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131 { |
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132 // Kluge alert! |
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134 if (name () == "stdin") |
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135 return 0; |
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136 else if (name () == "stdout") |
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137 return 1; |
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138 else if (name () == "stderr") |
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139 return 2; |
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140 else |
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141 return -1; |
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142 } |
2117 | 143 |
27172 | 144 bool ok (void) const { return ! m_fail; } |
2117 | 145 |
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146 // Return current error message for this stream. |
2117 | 147 |
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148 std::string error (bool clear, int& err_num); |
2117 | 149 |
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150 protected: |
2117 | 151 |
27172 | 152 int mode (void) const { return m_mode; } |
2117 | 153 |
27172 | 154 mach_info::float_format float_format (void) const { return m_flt_fmt; } |
2117 | 155 |
27172 | 156 std::string encoding (void) const { return m_encoding; } |
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157 |
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158 // Set current error state and set fail to TRUE. |
4889 | 159 |
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160 void error (const std::string& msg); |
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161 void error (const std::string& who, const std::string& msg); |
2117 | 162 |
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163 // Clear any error message and set fail to FALSE. |
3340 | 164 |
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165 void clear (void); |
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166 |
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167 // Clear stream state. |
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169 void clearerr (void); |
2117 | 170 |
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171 private: |
2117 | 172 |
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173 // The permission bits for the file. Should be some combination of |
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174 // std::ios::open_mode bits. |
27172 | 175 int m_mode; |
2117 | 176 |
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177 // Data format. |
27172 | 178 mach_info::float_format m_flt_fmt; |
2117 | 179 |
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180 // Code page |
27172 | 181 std::string m_encoding; |
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182 |
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183 // TRUE if an error has occurred. |
27172 | 184 bool m_fail; |
2117 | 185 |
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186 // TRUE if this stream is open. |
27172 | 187 bool m_open_state; |
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188 |
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189 // Should contain error message if fail is TRUE. |
27172 | 190 std::string m_errmsg; |
2117 | 191 |
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192 // Functions that are defined for all input streams (input streams |
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193 // are those that define is). |
2117 | 194 |
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195 std::string do_gets (octave_idx_type max_len, bool& err, bool strip_newline, |
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196 const std::string& who /* = "gets" */); |
2117 | 197 |
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198 std::string getl (octave_idx_type max_len, bool& err, |
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199 const std::string& who /* = "getl" */); |
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200 std::string gets (octave_idx_type max_len, bool& err, |
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201 const std::string& who /* = "gets" */); |
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202 off_t skipl (off_t count, bool& err, const std::string& who /* = "skipl" */); |
2117 | 203 |
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204 octave_value do_scanf (scanf_format_list& fmt_list, octave_idx_type nr, |
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205 octave_idx_type nc, |
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206 bool one_elt_size_spec, octave_idx_type& count, |
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207 const std::string& who /* = "scanf" */); |
2117 | 208 |
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209 octave_value scanf (const std::string& fmt, const Array<double>& size, |
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210 octave_idx_type& count, const std::string& who /* = "scanf" */); |
2215 | 211 |
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212 bool do_oscanf (const scanf_format_elt *elt, octave_value&, |
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213 const std::string& who /* = "scanf" */); |
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214 |
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215 octave_value_list oscanf (const std::string& fmt, |
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216 const std::string& who /* = "scanf" */); |
2117 | 217 |
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218 octave_value do_textscan (const std::string& fmt, octave_idx_type ntimes, |
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219 const octave_value_list& options, |
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220 const std::string& who, octave_idx_type& count); |
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221 |
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222 // Functions that are defined for all output streams (output streams |
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223 // are those that define os). |
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224 |
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225 int flush (void); |
2117 | 226 |
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227 int do_numeric_printf_conv (std::ostream& os, const printf_format_elt *elt, |
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228 int nsa, int sa_1, int sa_2, |
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229 const octave_value& val, |
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230 const std::string& who); |
2117 | 231 |
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232 int do_printf (printf_format_list& fmt_list, const octave_value_list& args, |
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233 const std::string& who /* = "printf" */); |
2117 | 234 |
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235 int printf (const std::string& fmt, const octave_value_list& args, |
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236 const std::string& who /* = "printf" */); |
2117 | 237 |
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238 int puts (const std::string& s, const std::string& who /* = "puts" */); |
2117 | 239 |
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240 // We can always do this in terms of seek(), so the derived class |
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241 // only has to provide that. |
2117 | 242 |
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243 void invalid_operation (const std::string& who, const char *rw); |
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244 }; |
2117 | 245 |
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246 class |
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247 OCTINTERP_API |
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248 stream |
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249 { |
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250 public: |
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252 // BS must be allocated with new or nullptr. |
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253 stream (base_stream *bs = nullptr) : m_rep (bs) { } |
2117 | 254 |
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255 stream (const stream&) = default; |
3340 | 256 |
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257 stream& operator = (const stream&) = default; |
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258 |
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259 ~stream (void) = default; |
2117 | 260 |
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261 int flush (void); |
2117 | 262 |
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263 std::string getl (octave_idx_type max_len, bool& err, |
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264 const std::string& who /* = "getl" */); |
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265 std::string getl (const octave_value& max_len, bool& err, |
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266 const std::string& who /* = "getl" */); |
2117 | 267 |
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268 std::string gets (octave_idx_type max_len, bool& err, |
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269 const std::string& who /* = "gets" */); |
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270 std::string gets (const octave_value& max_len, bool& err, |
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271 const std::string& who /* = "gets" */); |
2117 | 272 |
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273 off_t skipl (off_t count, bool& err, const std::string& who /* = "skipl" */); |
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274 off_t skipl (const octave_value& count, bool& err, |
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275 const std::string& who /* = "skipl" */); |
9701 | 276 |
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277 int seek (off_t offset, int origin); |
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278 int seek (const octave_value& offset, const octave_value& origin); |
2117 | 279 |
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280 off_t tell (void); |
2117 | 281 |
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282 int rewind (void); |
2117 | 283 |
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284 bool is_open (void) const; |
3340 | 285 |
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286 void close (void); |
3340 | 287 |
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288 octave_value read (const Array<double>& size, octave_idx_type block_size, |
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289 oct_data_conv::data_type input_type, |
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290 oct_data_conv::data_type output_type, |
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291 octave_idx_type skip, mach_info::float_format flt_fmt, |
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292 octave_idx_type& count); |
2117 | 293 |
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294 octave_idx_type write (const octave_value& data, octave_idx_type block_size, |
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295 oct_data_conv::data_type output_type, |
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296 octave_idx_type skip, |
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297 mach_info::float_format flt_fmt); |
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298 |
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299 bool write_bytes (const void *data, size_t n_elts); |
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300 |
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301 bool skip_bytes (size_t n_elts); |
4944 | 302 |
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303 template <typename T> |
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304 octave_idx_type write (const Array<T>& data, octave_idx_type block_size, |
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305 oct_data_conv::data_type output_type, |
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306 octave_idx_type skip, |
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307 mach_info::float_format flt_fmt); |
2117 | 308 |
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309 octave_value scanf (const std::string& fmt, const Array<double>& size, |
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310 octave_idx_type& count, const std::string& who /* = "scanf" */); |
2117 | 311 |
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312 octave_value scanf (const octave_value& fmt, const Array<double>& size, |
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313 octave_idx_type& count, const std::string& who /* = "scanf" */); |
5279 | 314 |
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315 octave_value_list oscanf (const std::string& fmt, |
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316 const std::string& who /* = "scanf" */); |
2215 | 317 |
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318 octave_value_list oscanf (const octave_value& fmt, |
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319 const std::string& who /* = "scanf" */); |
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321 octave_value textscan (const std::string& fmt, octave_idx_type ntimes, |
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322 const octave_value_list& options, |
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323 const std::string& who, octave_idx_type& count); |
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324 |
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325 int printf (const std::string& fmt, const octave_value_list& args, |
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326 const std::string& who /* = "printf" */); |
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327 |
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328 int printf (const octave_value& fmt, const octave_value_list& args, |
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329 const std::string& who /* = "printf" */); |
5279 | 330 |
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331 int puts (const std::string& s, const std::string& who /* = "puts" */); |
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332 int puts (const octave_value& s, const std::string& who /* = "puts" */); |
2117 | 333 |
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334 bool eof (void) const; |
2117 | 335 |
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336 std::string error (bool clear, int& err_num); |
2117 | 337 |
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338 std::string error (bool clear = false) |
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339 { |
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340 int err_num; |
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341 return error (clear, err_num); |
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342 } |
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343 |
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344 // Set the error message and state. |
2117 | 345 |
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346 void error (const std::string& msg) |
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347 { |
27172 | 348 if (m_rep) |
349 m_rep->error (msg); | |
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350 } |
4799 | 351 |
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352 void error (const char *msg) { error (std::string (msg)); } |
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353 |
27172 | 354 int file_number (void) { return m_rep ? m_rep->file_number () : -1; } |
4799 | 355 |
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356 bool is_valid (void) const { return bool (m_rep); } |
4799 | 357 |
27172 | 358 bool ok (void) const { return m_rep && m_rep->ok (); } |
3145 | 359 |
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360 operator bool () const { return ok (); } |
3340 | 361 |
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362 std::string name (void) const; |
2117 | 363 |
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364 int mode (void) const; |
2117 | 365 |
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366 mach_info::float_format float_format (void) const; |
2117 | 367 |
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368 static std::string mode_as_string (int mode); |
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369 |
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370 std::string encoding (void) |
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371 { |
27172 | 372 return m_rep ? m_rep->encoding () : std::string (); |
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373 } |
2117 | 374 |
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375 std::istream * input_stream (void) |
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376 { |
27172 | 377 return m_rep ? m_rep->input_stream () : nullptr; |
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378 } |
2117 | 379 |
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380 std::ostream * output_stream (void) |
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381 { |
27172 | 382 return m_rep ? m_rep->output_stream () : nullptr; |
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383 } |
2902 | 384 |
27172 | 385 void clearerr (void) { if (m_rep) m_rep->clearerr (); } |
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386 |
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387 private: |
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388 |
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389 // The actual representation of this stream. |
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390 std::shared_ptr<base_stream> m_rep; |
4889 | 391 |
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392 bool stream_ok (bool clear = true) const |
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393 { |
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394 bool retval = true; |
2117 | 395 |
27172 | 396 if (m_rep) |
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397 { |
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398 if (clear) |
27172 | 399 m_rep->clear (); |
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400 } |
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401 else |
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402 retval = false; |
2117 | 403 |
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404 return retval; |
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405 } |
5659 | 406 |
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407 void invalid_operation (const std::string& who, const char *rw) |
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408 { |
27172 | 409 if (m_rep) |
410 m_rep->invalid_operation (who, rw); | |
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411 } |
5659 | 412 |
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413 octave_value |
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414 finalize_read (std::list<void *>& input_buf_list, |
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415 octave_idx_type input_buf_elts, |
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416 octave_idx_type elts_read, |
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417 octave_idx_type nr, octave_idx_type nc, |
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418 oct_data_conv::data_type input_type, |
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419 oct_data_conv::data_type output_type, |
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420 mach_info::float_format ffmt); |
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421 }; |
4944 | 422 |
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423 class |
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424 OCTINTERP_API |
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425 stream_list |
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426 { |
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427 public: |
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428 |
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429 stream_list (interpreter& interp); |
2117 | 430 |
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431 stream_list (const stream_list&) = delete; |
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432 stream_list& operator = (const stream_list&) = delete; |
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433 |
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434 ~stream_list (void); |
2117 | 435 |
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436 int insert (stream& os); |
2117 | 437 |
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438 stream lookup (int fid, const std::string& who = "") const; |
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439 stream lookup (const octave_value& fid, const std::string& who = "") const; |
2117 | 440 |
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441 int remove (int fid, const std::string& who = ""); |
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442 int remove (const octave_value& fid, const std::string& who = ""); |
2117 | 443 |
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444 void clear (bool flush = true); |
4468 | 445 |
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446 string_vector get_info (int fid) const; |
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447 string_vector get_info (const octave_value& fid) const; |
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448 |
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449 std::string list_open_files (void) const; |
2117 | 450 |
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451 octave_value open_file_numbers (void) const; |
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452 |
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453 int get_file_number (const octave_value& fid) const; |
2117 | 454 |
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455 octave_value stdin_file (void) const; |
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456 octave_value stdout_file (void) const; |
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457 octave_value stderr_file (void) const; |
2117 | 458 |
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459 private: |
2117 | 460 |
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461 typedef std::map<int, stream> ostrl_map; |
2117 | 462 |
27172 | 463 ostrl_map m_list; |
2117 | 464 |
27172 | 465 mutable ostrl_map::const_iterator m_lookup_cache; |
2609 | 466 |
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467 int m_stdin_file; |
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468 int m_stdout_file; |
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469 int m_stderr_file; |
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470 }; |
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471 } |
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472 |
2117 | 473 #endif |