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>
date Thu, 21 Nov 2019 19:23:20 -0600
parents 396996f1dad0
children 61cc648ab034
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1 /*
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2
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3 Copyright (C) 1996-2019 John W. Eaton
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4
b240b2fce8ed [project @ 1996-05-10 07:20:36 by jwe]
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5 This file is part of Octave.
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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.
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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.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <https://www.gnu.org/licenses/>.
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20
b240b2fce8ed [project @ 1996-05-10 07:20:36 by jwe]
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21 */
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22
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23 #if ! defined (octave_oct_stream_h)
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24 #define octave_oct_stream_h 1
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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>
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33 #include <string>
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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
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43 #include "data-conv.h"
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44 #include "mach-info.h"
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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.
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52
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53 class scanf_format_elt;
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54 class scanf_format_list;
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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.
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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;
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66
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67 public:
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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),
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73 m_fail (false), m_open_state (true), m_errmsg ()
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74 { }
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75
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76 // No copying!
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78 base_stream (const base_stream&) = delete;
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79
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80 base_stream& operator = (const base_stream&) = delete;
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81
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82 virtual ~base_stream (void) = default;
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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.
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86
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87 // Position a stream at OFFSET relative to ORIGIN.
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88
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89 virtual int seek (off_t offset, int origin) = 0;
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90
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91 // Return current stream position.
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92
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93 virtual off_t tell (void) = 0;
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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;
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98
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99 // The name of the file.
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100
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101 virtual std::string name (void) const = 0;
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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.
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106
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107 virtual std::istream * input_stream (void) { return nullptr; }
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108
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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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112
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113 virtual std::ostream * output_stream (void) { return nullptr; }
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114
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115 // Return TRUE if this stream is open.
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116
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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) { }
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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 {
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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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133
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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 }
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143
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144 bool ok (void) const { return ! m_fail; }
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145
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146 // Return current error message for this stream.
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147
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148 std::string error (bool clear, int& err_num);
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149
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150 protected:
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151
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152 int mode (void) const { return m_mode; }
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153
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154 mach_info::float_format float_format (void) const { return m_flt_fmt; }
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155
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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.
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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);
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162
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163 // Clear any error message and set fail to FALSE.
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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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168
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169 void clearerr (void);
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170
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171 private:
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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.
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175 int m_mode;
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176
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177 // Data format.
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178 mach_info::float_format m_flt_fmt;
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179
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180 // Code page
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181 std::string m_encoding;
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182
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183 // TRUE if an error has occurred.
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184 bool m_fail;
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185
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186 // TRUE if this stream is open.
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187 bool m_open_state;
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188
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189 // Should contain error message if fail is TRUE.
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190 std::string m_errmsg;
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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).
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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" */);
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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" */);
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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" */);
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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" */);
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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" */);
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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);
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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);
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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" */);
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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" */);
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237
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238 int puts (const std::string& s, const std::string& who /* = "puts" */);
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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.
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242
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243 void invalid_operation (const std::string& who, const char *rw);
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244 };
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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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251
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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) { }
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254
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255 stream (const stream&) = default;
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256
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257 stream& operator = (const stream&) = default;
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258
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259 ~stream (void) = default;
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260
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261 int flush (void);
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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" */);
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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" */);
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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" */);
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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);
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279
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280 off_t tell (void);
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281
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282 int rewind (void);
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283
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284 bool is_open (void) const;
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285
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286 void close (void);
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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);
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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);
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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);
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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" */);
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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" */);
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314
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315 octave_value_list oscanf (const std::string& fmt,
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316 const std::string& who /* = "scanf" */);
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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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320
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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" */);
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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" */);
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333
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334 bool eof (void) const;
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335
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336 std::string error (bool clear, int& err_num);
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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.
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345
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346 void error (const std::string& msg)
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347 {
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348 if (m_rep)
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349 m_rep->error (msg);
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350 }
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351
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352 void error (const char *msg) { error (std::string (msg)); }
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353
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354 int file_number (void) { return m_rep ? m_rep->file_number () : -1; }
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355
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356 bool is_valid (void) const { return bool (m_rep); }
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357
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358 bool ok (void) const { return m_rep && m_rep->ok (); }
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359
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360 operator bool () const { return ok (); }
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361
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362 std::string name (void) const;
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363
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364 int mode (void) const;
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365
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366 mach_info::float_format float_format (void) const;
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367
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368 static std::string mode_as_string (int mode);
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diff changeset
369
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diff changeset
370 std::string encoding (void)
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371 {
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372 return m_rep ? m_rep->encoding () : std::string ();
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diff changeset
373 }
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374
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diff changeset
375 std::istream * input_stream (void)
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376 {
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377 return m_rep ? m_rep->input_stream () : nullptr;
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378 }
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379
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diff changeset
380 std::ostream * output_stream (void)
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381 {
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382 return m_rep ? m_rep->output_stream () : nullptr;
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383 }
2902
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384
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385 void clearerr (void) { if (m_rep) m_rep->clearerr (); }
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386
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diff changeset
387 private:
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diff changeset
388
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389 // The actual representation of this stream.
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diff changeset
390 std::shared_ptr<base_stream> m_rep;
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diff changeset
391
23059
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diff changeset
392 bool stream_ok (bool clear = true) const
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diff changeset
393 {
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diff changeset
394 bool retval = true;
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395
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396 if (m_rep)
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397 {
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diff changeset
398 if (clear)
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diff changeset
399 m_rep->clear ();
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400 }
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diff changeset
401 else
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diff changeset
402 retval = false;
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diff changeset
403
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diff changeset
404 return retval;
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diff changeset
405 }
5659
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parents: 5649
diff changeset
406
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diff changeset
407 void invalid_operation (const std::string& who, const char *rw)
b98ebcd7f11c move some octave stream classes into octave namespace
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diff changeset
408 {
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diff changeset
409 if (m_rep)
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diff changeset
410 m_rep->invalid_operation (who, rw);
23059
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diff changeset
411 }
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diff changeset
412
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diff changeset
413 octave_value
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diff changeset
414 finalize_read (std::list<void *>& input_buf_list,
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diff changeset
415 octave_idx_type input_buf_elts,
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diff changeset
416 octave_idx_type elts_read,
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diff changeset
417 octave_idx_type nr, octave_idx_type nc,
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diff changeset
418 oct_data_conv::data_type input_type,
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parents: 23012
diff changeset
419 oct_data_conv::data_type output_type,
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420 mach_info::float_format ffmt);
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421 };
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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);
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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);
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435
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436 int insert (stream& os);
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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;
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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 = "");
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443
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444 void clear (bool flush = true);
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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;
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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;
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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;
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458
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459 private:
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460
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461 typedef std::map<int, stream> ostrl_map;
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462
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463 ostrl_map m_list;
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464
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465 mutable ostrl_map::const_iterator m_lookup_cache;
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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
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473 #endif