annotate libinterp/corefcn/oct-stream.h @ 26703:29ea2369971d

Add basic backend for encodings in file streams (bug #55452). * oct-stream.h (base_stream): Store encoding in class. * oct-stream.cc (do_scanf_conv): Convert strings from encoding. (do_printf_string): Convert strings to encoding. (base_stream::printf): Convert format string to encoding. * oct-stdstrm.h (octave_stdiostream, octave_tstdiostream, octave_zstdiostream, create): Pass encoding through to base_stream. * oct-prcstrm.[cc,h] (octave_iprocstream, octave_oprocstream, create): Pass encoding through to octave_stdiostream. * oct-strstrm.[cc,h] (octave_istrstream, octave_ostrstream, create): Pass encoding through to base_stream.
author Markus Mützel <markus.muetzel@gmx.de>
date Sat, 09 Feb 2019 16:43:11 +0100
parents fff643eb3514
children ab5bfee22d18
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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
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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
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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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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 <string>
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34 // These only appear as reference arguments or return values.
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35
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36 template <typename T> class Array;
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37 class Cell;
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38 class octave_value;
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39 class octave_value_list;
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40 class string_vector;
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41
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42 #include "data-conv.h"
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43 #include "mach-info.h"
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44 #include "oct-refcount.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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67 public:
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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 : count (0), md (arg_md), flt_fmt (ff), mencoding (encoding),
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73 fail (false), open_state (true), errmsg ()
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74 { }
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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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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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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 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 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 ! 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 md; }
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153
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154 mach_info::float_format float_format (void) const { return flt_fmt; }
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155
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156 std::string encoding (void) const { return mencoding; }
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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 // A reference count.
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174 refcount<octave_idx_type> count;
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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 md;
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179
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180 // Data format.
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181 mach_info::float_format flt_fmt;
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182
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183 // Code page
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184 std::string mencoding;
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185
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186 // TRUE if an error has occurred.
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187 bool fail;
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188
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189 // TRUE if this stream is open.
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190 bool 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 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 int do_printf (printf_format_list& fmt_list, 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 printf (std::string fmt, const octave_value_list& args,
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239 const std::string& who /* = "printf" */);
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240
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241 int puts (const std::string& s, const std::string& who /* = "puts" */);
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242
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243 // We can always do this in terms of seek(), so the derived class
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244 // only has to provide that.
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245
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246 void invalid_operation (const std::string& who, const char *rw);
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247 };
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248
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249 class
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250 OCTINTERP_API
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251 stream
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252 {
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253 public:
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254
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255 stream (base_stream *bs = nullptr);
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256
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257 ~stream (void);
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258
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259 stream (const stream&);
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260
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261 stream& operator = (const stream&);
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262
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263 int flush (void);
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264
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265 std::string getl (octave_idx_type max_len, bool& err,
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266 const std::string& who /* = "getl" */);
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267 std::string getl (const octave_value& max_len, bool& err,
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268 const std::string& who /* = "getl" */);
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269
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270 std::string gets (octave_idx_type max_len, bool& err,
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271 const std::string& who /* = "gets" */);
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272 std::string gets (const octave_value& max_len, bool& err,
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273 const std::string& who /* = "gets" */);
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274
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275 off_t skipl (off_t count, bool& err, const std::string& who /* = "skipl" */);
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276 off_t skipl (const octave_value& count, bool& err,
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277 const std::string& who /* = "skipl" */);
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278
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279 int seek (off_t offset, int origin);
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280 int seek (const octave_value& offset, const octave_value& origin);
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281
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282 off_t tell (void);
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283
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284 int rewind (void);
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285
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286 bool is_open (void) const;
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287
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288 void close (void);
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289
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290 octave_value read (const Array<double>& size, octave_idx_type block_size,
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291 oct_data_conv::data_type input_type,
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292 oct_data_conv::data_type output_type,
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293 octave_idx_type skip, mach_info::float_format flt_fmt,
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294 octave_idx_type& count);
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295
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296 octave_idx_type write (const octave_value& data, octave_idx_type block_size,
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297 oct_data_conv::data_type output_type,
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298 octave_idx_type skip,
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299 mach_info::float_format flt_fmt);
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300
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301 bool write_bytes (const void *data, size_t n_elts);
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302
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303 bool skip_bytes (size_t n_elts);
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304
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305 template <typename T>
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306 octave_idx_type write (const Array<T>& data, octave_idx_type block_size,
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307 oct_data_conv::data_type output_type,
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308 octave_idx_type skip,
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309 mach_info::float_format flt_fmt);
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310
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311 octave_value scanf (const std::string& fmt, const Array<double>& size,
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diff changeset
312 octave_idx_type& count, const std::string& who /* = "scanf" */);
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313
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314 octave_value scanf (const octave_value& 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_list oscanf (const std::string& fmt,
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318 const std::string& who /* = "scanf" */);
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319
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320 octave_value_list oscanf (const octave_value& fmt,
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321 const std::string& who /* = "scanf" */);
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322
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323 octave_value textscan (const std::string& fmt, octave_idx_type ntimes,
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diff changeset
324 const octave_value_list& options,
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diff changeset
325 const std::string& who, octave_idx_type& count);
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326
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diff changeset
327 int printf (const std::string& fmt, const octave_value_list& args,
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diff changeset
328 const std::string& who /* = "printf" */);
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329
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330 int printf (const octave_value& fmt, const octave_value_list& args,
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diff changeset
331 const std::string& who /* = "printf" */);
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332
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333 int puts (const std::string& s, const std::string& who /* = "puts" */);
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diff changeset
334 int puts (const octave_value& s, const std::string& who /* = "puts" */);
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335
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336 bool eof (void) const;
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337
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338 std::string error (bool clear, int& err_num);
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339
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340 std::string error (bool clear = false)
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341 {
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342 int err_num;
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343 return error (clear, err_num);
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344 }
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345
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346 // Set the error message and state.
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347
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diff changeset
348 void error (const std::string& msg)
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349 {
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350 if (rep)
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351 rep->error (msg);
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352 }
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353
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diff changeset
354 void error (const char *msg) { error (std::string (msg)); }
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diff changeset
355
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diff changeset
356 int file_number (void) { return rep ? rep->file_number () : -1; }
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357
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358 bool is_valid (void) const { return (rep != nullptr); }
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359
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360 bool ok (void) const { return rep && rep->ok (); }
3145
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361
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362 operator bool () const { return ok (); }
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363
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364 std::string name (void) const;
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365
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366 int mode (void) const;
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367
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368 mach_info::float_format float_format (void) const;
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369
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370 static std::string mode_as_string (int mode);
26703
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371
29ea2369971d Add basic backend for encodings in file streams (bug #55452).
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diff changeset
372 std::string encoding (void)
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diff changeset
373 {
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diff changeset
374 return rep ? rep->encoding () : std::string ();
29ea2369971d Add basic backend for encodings in file streams (bug #55452).
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diff changeset
375 }
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376
23446
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diff changeset
377 std::istream * input_stream (void)
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diff changeset
378 {
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diff changeset
379 return rep ? rep->input_stream () : nullptr;
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diff changeset
380 }
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381
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parents: 23220
diff changeset
382 std::ostream * output_stream (void)
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383 {
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diff changeset
384 return rep ? rep->output_stream () : nullptr;
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diff changeset
385 }
2902
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diff changeset
386
23059
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diff changeset
387 void clearerr (void) { if (rep) rep->clearerr (); }
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diff changeset
388
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diff changeset
389 private:
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diff changeset
390
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diff changeset
391 // The actual representation of this stream.
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diff changeset
392 base_stream *rep;
4889
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diff changeset
393
23059
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diff changeset
394 bool stream_ok (bool clear = true) const
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diff changeset
395 {
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diff changeset
396 bool retval = true;
2117
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397
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diff changeset
398 if (rep)
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diff changeset
399 {
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diff changeset
400 if (clear)
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diff changeset
401 rep->clear ();
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parents: 23012
diff changeset
402 }
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diff changeset
403 else
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diff changeset
404 retval = false;
2117
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diff changeset
405
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diff changeset
406 return retval;
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diff changeset
407 }
5659
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jwe
parents: 5649
diff changeset
408
23059
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parents: 23012
diff changeset
409 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
410 {
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parents: 23012
diff changeset
411 if (rep)
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diff changeset
412 rep->invalid_operation (who, rw);
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parents: 23012
diff changeset
413 }
5659
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parents: 5649
diff changeset
414
23059
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diff changeset
415 octave_value
b98ebcd7f11c move some octave stream classes into octave namespace
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diff changeset
416 finalize_read (std::list<void *>& input_buf_list,
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417 octave_idx_type input_buf_elts,
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418 octave_idx_type elts_read,
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419 octave_idx_type nr, octave_idx_type nc,
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420 oct_data_conv::data_type input_type,
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421 oct_data_conv::data_type output_type,
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422 mach_info::float_format ffmt);
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423 };
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424
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425 class
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426 OCTINTERP_API
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427 stream_list
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428 {
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429 public:
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430
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431 stream_list (interpreter& interp);
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432
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433 stream_list (const stream_list&) = delete;
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434 stream_list& operator = (const stream_list&) = delete;
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435
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436 ~stream_list (void);
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437
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438 int insert (stream& os);
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439
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440 stream lookup (int fid, const std::string& who = "") const;
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441 stream lookup (const octave_value& fid, const std::string& who = "") const;
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442
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443 int remove (int fid, const std::string& who = "");
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444 int remove (const octave_value& fid, const std::string& who = "");
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445
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446 void clear (bool flush = true);
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447
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448 string_vector get_info (int fid) const;
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449 string_vector get_info (const octave_value& fid) const;
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450
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451 std::string list_open_files (void) const;
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452
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453 octave_value open_file_numbers (void) const;
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454
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455 int get_file_number (const octave_value& fid) const;
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456
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457 octave_value stdin_file (void) const;
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458 octave_value stdout_file (void) const;
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459 octave_value stderr_file (void) const;
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460
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461 private:
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462
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463 typedef std::map<int, stream> ostrl_map;
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464
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465 ostrl_map list;
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466
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467 mutable ostrl_map::const_iterator lookup_cache;
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468
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469 int m_stdin_file;
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470 int m_stdout_file;
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471 int m_stderr_file;
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472 };
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473 }
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474
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475 #endif