annotate libinterp/corefcn/oct-stream.h @ 27923:bd51beb6205e

update formatting of copyright notices * Use <https://octave.org/copyright/> instead of <https://octave.org/COPYRIGHT.html/>. * For consistency with other comments in the Octave sources, use C++-style comments for copyright blocks in C and C++ files. * Use delimiters above and below copyright blocks that are appropriate for the language used in the file. * Eliminate extra spacing inside copyright blocks. * lex.ll (looks_like_copyright): Also allow newlines and carriage returns before the word "Copyright". * scripts/mk-doc.pl (gethelp): Also skip empty comment lines. * bp-table.cc, type.m: Adjust tests.
author John W. Eaton <jwe@octave.org>
date Wed, 08 Jan 2020 11:59:41 -0500
parents 1891570abac8
children 665c9ed14c97 0a5b15007766
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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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
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6 // distribution or <https://octave.org/copyright/>.
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7 //
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8 // This file is part of Octave.
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9 //
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10 // Octave is free software: you can redistribute it and/or modify it
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11 // under the terms of the GNU General Public License as published by
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12 // the Free Software Foundation, either version 3 of the License, or
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13 // (at your option) any later version.
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14 //
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15 // Octave is distributed in the hope that it will be useful, but
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 // GNU General Public License for more details.
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19 //
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20 // You should have received a copy of the GNU General Public License
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21 // along with Octave; see the file COPYING. If not, see
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22 // <https://www.gnu.org/licenses/>.
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23 //
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24 ////////////////////////////////////////////////////////////////////////
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25
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26 #if ! defined (octave_oct_stream_h)
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27 #define octave_oct_stream_h 1
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28
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29 #include "octave-config.h"
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30
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31 #include <ios>
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32 #include <iosfwd>
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33 #include <list>
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34 #include <map>
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35 #include <memory>
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36 #include <string>
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37
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38 // These only appear as reference arguments or return values.
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39
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40 template <typename T> class Array;
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41 class Cell;
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42 class octave_value;
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43 class octave_value_list;
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44 class string_vector;
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45
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46 #include "data-conv.h"
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47 #include "mach-info.h"
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48
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49 namespace octave
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50 {
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51 class interpreter;
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52
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53 // These are only needed as arguments to private functions, so they
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54 // are also treated as private.
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55
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56 class scanf_format_elt;
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57 class scanf_format_list;
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58
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59 class printf_format_elt;
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60 class printf_format_list;
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61
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62 // Provide an interface for Octave streams.
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63
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64 class
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65 OCTINTERP_API
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66 base_stream
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67 {
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68 friend class stream;
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69
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70 public:
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71
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72 base_stream (std::ios::openmode arg_md = std::ios::in | std::ios::out,
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73 mach_info::float_format ff = mach_info::native_float_format (),
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74 const std::string& encoding = "utf-8")
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75 : m_mode (arg_md), m_flt_fmt (ff), m_encoding (encoding),
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76 m_fail (false), m_open_state (true), m_errmsg ()
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77 { }
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78
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79 // No copying!
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80
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81 base_stream (const base_stream&) = delete;
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82
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83 base_stream& operator = (const base_stream&) = delete;
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84
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85 virtual ~base_stream (void) = default;
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86
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87 // The remaining functions are not specific to input or output only,
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88 // and must be provided by the derived classes.
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89
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90 // Position a stream at OFFSET relative to ORIGIN.
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91
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92 virtual int seek (off_t offset, int origin) = 0;
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93
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94 // Return current stream position.
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95
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96 virtual off_t tell (void) = 0;
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97
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98 // Return TRUE if EOF has been reached on this stream.
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99
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100 virtual bool eof (void) const = 0;
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101
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102 // The name of the file.
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103
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104 virtual std::string name (void) const = 0;
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105
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106 // If the derived class provides this function and it returns a
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107 // pointer to a valid istream, scanf(), read(), getl(), and gets()
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108 // will automatically work for this stream.
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109
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110 virtual std::istream * input_stream (void) { return nullptr; }
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111
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112 // If the derived class provides this function and it returns a
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113 // pointer to a valid ostream, flush(), write(), and printf() will
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114 // automatically work for this stream.
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115
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116 virtual std::ostream * output_stream (void) { return nullptr; }
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117
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118 // Return TRUE if this stream is open.
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119
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120 bool is_open (void) const { return m_open_state; }
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121
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122 virtual void do_close (void) { }
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123
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124 void close (void)
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125 {
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126 if (is_open ())
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127 {
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128 m_open_state = false;
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129 do_close ();
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130 }
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131 }
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132
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133 virtual int file_number (void) const
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134 {
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135 // Kluge alert!
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136
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137 if (name () == "stdin")
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138 return 0;
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139 else if (name () == "stdout")
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140 return 1;
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141 else if (name () == "stderr")
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142 return 2;
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143 else
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144 return -1;
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145 }
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146
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147 bool ok (void) const { return ! m_fail; }
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148
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149 // Return current error message for this stream.
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150
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151 std::string error (bool clear, int& err_num);
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152
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153 protected:
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154
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155 int mode (void) const { return m_mode; }
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156
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157 mach_info::float_format float_format (void) const { return m_flt_fmt; }
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158
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159 std::string encoding (void) const { return m_encoding; }
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160
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161 // Set current error state and set fail to TRUE.
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162
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163 void error (const std::string& msg);
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164 void error (const std::string& who, const std::string& msg);
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165
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166 // Clear any error message and set fail to FALSE.
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167
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168 void clear (void);
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169
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170 // Clear stream state.
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171
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172 void clearerr (void);
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173
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174 private:
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175
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176 // The permission bits for the file. Should be some combination of
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177 // std::ios::open_mode bits.
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178 int m_mode;
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179
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180 // Data format.
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181 mach_info::float_format m_flt_fmt;
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182
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183 // Code page
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184 std::string m_encoding;
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185
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186 // TRUE if an error has occurred.
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187 bool m_fail;
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188
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189 // TRUE if this stream is open.
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190 bool m_open_state;
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191
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192 // Should contain error message if fail is TRUE.
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193 std::string m_errmsg;
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194
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195 // Functions that are defined for all input streams (input streams
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196 // are those that define is).
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197
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198 std::string do_gets (octave_idx_type max_len, bool& err, bool strip_newline,
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199 const std::string& who /* = "gets" */);
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200
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201 std::string getl (octave_idx_type max_len, bool& err,
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202 const std::string& who /* = "getl" */);
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203 std::string gets (octave_idx_type max_len, bool& err,
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204 const std::string& who /* = "gets" */);
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205 off_t skipl (off_t count, bool& err, const std::string& who /* = "skipl" */);
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206
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207 octave_value do_scanf (scanf_format_list& fmt_list, octave_idx_type nr,
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208 octave_idx_type nc,
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209 bool one_elt_size_spec, octave_idx_type& count,
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210 const std::string& who /* = "scanf" */);
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211
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212 octave_value scanf (const std::string& fmt, const Array<double>& size,
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213 octave_idx_type& count, const std::string& who /* = "scanf" */);
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214
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215 bool do_oscanf (const scanf_format_elt *elt, octave_value&,
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216 const std::string& who /* = "scanf" */);
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217
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218 octave_value_list oscanf (const std::string& fmt,
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219 const std::string& who /* = "scanf" */);
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220
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221 octave_value do_textscan (const std::string& fmt, octave_idx_type ntimes,
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222 const octave_value_list& options,
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223 const std::string& who, octave_idx_type& count);
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224
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225 // Functions that are defined for all output streams (output streams
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226 // are those that define os).
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227
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228 int flush (void);
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229
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230 int do_numeric_printf_conv (std::ostream& os, const printf_format_elt *elt,
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231 int nsa, int sa_1, int sa_2,
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232 const octave_value& val,
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233 const std::string& who);
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234
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235 void field_width_error (const std::string& who) const;
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236
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237 int do_printf (printf_format_list& fmt_list, const octave_value_list& args,
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238 const std::string& who /* = "printf" */);
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239
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240 int printf (const std::string& fmt, const octave_value_list& args,
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241 const std::string& who /* = "printf" */);
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242
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243 int puts (const std::string& s, const std::string& who /* = "puts" */);
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244
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245 // We can always do this in terms of seek(), so the derived class
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246 // only has to provide that.
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247
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248 void invalid_operation (const std::string& who, const char *rw);
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249 };
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250
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251 class
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252 OCTINTERP_API
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253 stream
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254 {
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255 public:
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256
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257 // BS must be allocated with new or nullptr.
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258 stream (base_stream *bs = nullptr) : m_rep (bs) { }
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259
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260 stream (const stream&) = default;
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261
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262 stream& operator = (const stream&) = default;
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263
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264 ~stream (void) = default;
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265
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266 int flush (void);
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267
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268 std::string getl (octave_idx_type max_len, bool& err,
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269 const std::string& who /* = "getl" */);
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270 std::string getl (const octave_value& max_len, bool& err,
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271 const std::string& who /* = "getl" */);
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272
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273 std::string gets (octave_idx_type max_len, bool& err,
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274 const std::string& who /* = "gets" */);
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275 std::string gets (const octave_value& max_len, bool& err,
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276 const std::string& who /* = "gets" */);
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277
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278 off_t skipl (off_t count, bool& err, const std::string& who /* = "skipl" */);
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279 off_t skipl (const octave_value& count, bool& err,
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280 const std::string& who /* = "skipl" */);
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281
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282 int seek (off_t offset, int origin);
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283 int seek (const octave_value& offset, const octave_value& origin);
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284
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285 off_t tell (void);
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286
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287 int rewind (void);
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288
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289 bool is_open (void) const;
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290
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291 void close (void);
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292
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293 octave_value read (const Array<double>& size, octave_idx_type block_size,
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294 oct_data_conv::data_type input_type,
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295 oct_data_conv::data_type output_type,
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296 octave_idx_type skip, mach_info::float_format flt_fmt,
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297 octave_idx_type& count);
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298
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299 octave_idx_type write (const octave_value& data, octave_idx_type block_size,
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300 oct_data_conv::data_type output_type,
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301 octave_idx_type skip,
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302 mach_info::float_format flt_fmt);
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303
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304 bool write_bytes (const void *data, size_t n_elts);
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305
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306 bool skip_bytes (size_t n_elts);
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307
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308 template <typename T>
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309 octave_idx_type write (const Array<T>& data, octave_idx_type block_size,
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310 oct_data_conv::data_type output_type,
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311 octave_idx_type skip,
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312 mach_info::float_format flt_fmt);
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313
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314 octave_value scanf (const std::string& fmt, const Array<double>& size,
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315 octave_idx_type& count, const std::string& who /* = "scanf" */);
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316
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317 octave_value scanf (const octave_value& fmt, const Array<double>& size,
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318 octave_idx_type& count, const std::string& who /* = "scanf" */);
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319
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320 octave_value_list oscanf (const std::string& fmt,
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321 const std::string& who /* = "scanf" */);
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322
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323 octave_value_list oscanf (const octave_value& fmt,
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324 const std::string& who /* = "scanf" */);
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325
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326 octave_value textscan (const std::string& fmt, octave_idx_type ntimes,
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327 const octave_value_list& options,
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328 const std::string& who, octave_idx_type& count);
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329
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330 int printf (const std::string& fmt, const octave_value_list& args,
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331 const std::string& who /* = "printf" */);
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332
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333 int printf (const octave_value& fmt, const octave_value_list& args,
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334 const std::string& who /* = "printf" */);
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335
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336 int puts (const std::string& s, const std::string& who /* = "puts" */);
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337 int puts (const octave_value& s, const std::string& who /* = "puts" */);
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338
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339 bool eof (void) const;
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340
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341 std::string error (bool clear, int& err_num);
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342
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343 std::string error (bool clear = false)
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344 {
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345 int err_num;
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346 return error (clear, err_num);
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347 }
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348
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349 // Set the error message and state.
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350
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351 void error (const std::string& msg)
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352 {
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353 if (m_rep)
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354 m_rep->error (msg);
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355 }
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356
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357 void error (const char *msg) { error (std::string (msg)); }
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358
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359 int file_number (void) { return m_rep ? m_rep->file_number () : -1; }
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360
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361 bool is_valid (void) const { return bool (m_rep); }
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362
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363 bool ok (void) const { return m_rep && m_rep->ok (); }
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364
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365 operator bool () const { return ok (); }
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366
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367 std::string name (void) const;
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368
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369 int mode (void) const;
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370
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371 mach_info::float_format float_format (void) const;
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372
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373 static std::string mode_as_string (int mode);
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374
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375 std::string encoding (void)
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376 {
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377 return m_rep ? m_rep->encoding () : std::string ();
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378 }
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379
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diff changeset
380 std::istream * input_stream (void)
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381 {
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382 return m_rep ? m_rep->input_stream () : nullptr;
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383 }
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384
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385 std::ostream * output_stream (void)
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386 {
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387 return m_rep ? m_rep->output_stream () : nullptr;
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388 }
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389
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390 void clearerr (void) { if (m_rep) m_rep->clearerr (); }
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391
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392 private:
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393
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394 // The actual representation of this stream.
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395 std::shared_ptr<base_stream> m_rep;
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396
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397 bool stream_ok (bool clear = true) const
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398 {
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399 bool retval = true;
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400
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401 if (m_rep)
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402 {
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403 if (clear)
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404 m_rep->clear ();
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405 }
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diff changeset
406 else
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407 retval = false;
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408
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409 return retval;
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diff changeset
410 }
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diff changeset
411
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412 void invalid_operation (const std::string& who, const char *rw)
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diff changeset
413 {
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414 if (m_rep)
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diff changeset
415 m_rep->invalid_operation (who, rw);
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416 }
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417
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diff changeset
418 octave_value
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419 finalize_read (std::list<void *>& input_buf_list,
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420 octave_idx_type input_buf_elts,
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421 octave_idx_type elts_read,
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422 octave_idx_type nr, octave_idx_type nc,
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423 oct_data_conv::data_type input_type,
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424 oct_data_conv::data_type output_type,
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425 mach_info::float_format ffmt);
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426 };
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427
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428 class
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429 OCTINTERP_API
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430 stream_list
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431 {
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432 public:
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433
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434 stream_list (interpreter& interp);
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435
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436 stream_list (const stream_list&) = delete;
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437 stream_list& operator = (const stream_list&) = delete;
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438
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439 ~stream_list (void);
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440
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441 int insert (stream& os);
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442
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443 stream lookup (int fid, const std::string& who = "") const;
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444 stream lookup (const octave_value& fid, const std::string& who = "") const;
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445
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446 int remove (int fid, const std::string& who = "");
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447 int remove (const octave_value& fid, const std::string& who = "");
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448
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449 void clear (bool flush = true);
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450
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451 string_vector get_info (int fid) const;
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452 string_vector get_info (const octave_value& fid) const;
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453
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454 std::string list_open_files (void) const;
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455
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456 octave_value open_file_numbers (void) const;
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457
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458 int get_file_number (const octave_value& fid) const;
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459
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460 octave_value stdin_file (void) const;
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461 octave_value stdout_file (void) const;
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462 octave_value stderr_file (void) const;
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463
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464 private:
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465
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466 typedef std::map<int, stream> ostrl_map;
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467
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468 ostrl_map m_list;
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469
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470 mutable ostrl_map::const_iterator m_lookup_cache;
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471
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472 int m_stdin_file;
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473 int m_stdout_file;
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474 int m_stderr_file;
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475 };
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476 }
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477
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478 #endif