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annotate liboctave/util/oct-string.h @ 30822:0826c503f294

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Encoding facet based on gnulib uniconv for STL iostreams (bug #61839). * liboctave/util/oct-string.h, liboctave/util/oct-string.cc (codecvt_u8): Add encoding facet based on gnulib uniconv for STL iostreams. * liboctave/wrappers/uniconv-wrappers.h, liboctave/wrappers/uniconv-wrappers.c (octave_u8_conv_from_encoding_offsets, octave_u8_conv_to_encoding_offsets): Add new wrappers. * libinterp/corefcn/oct-stream.h, libinterp/corefcn/oct-stream.cc (octave::stream): Wrap output stream with encoding facet. * libinterp/corefcn/utils.h, libinterp/corefcn/utils.cc (format, vformat): Remove functions that are no longer needed. * libinterp/corefcn/file-io.cc: Add BIST.
author Markus Mützel <markus.muetzel@gmx.de>
date Sat, 05 Mar 2022 21:20:58 +0100
parents 796f54d4ddbf
children e88a07dec498
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 2016-2022 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_string_h)
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27 #define octave_oct_string_h 1
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28
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29 #include "octave-config.h"
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31 #include <locale>
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33 #include "oct-cmplx.h"
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34
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35 namespace octave
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36 {
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37 //! Octave string utility functions.
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38 //!
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39 //! This functions provide a C++ interface to most string functions
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40 //! available in the Octave interpreter.
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41 //!
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42 //! Specializations for Array may consider its dimensions in addition
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43 //! to the actual string contents.
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44 //!
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45 //! @attention
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46 //! Octave's string comparison functions return true when strings are
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47 //! are equal, just the opposite of the corresponding C library functions.
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48 //! In addition, Octave's function only return bool and do not check
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49 //! lexicographical order.
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50
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51 namespace string
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52 {
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53 //! True if strings are the same.
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54 //!
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55 //! ## Specialization for Array<char>
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56 //!
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57 //! When comparing whole Array of chars, the actual Array dimensions
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58 //! are significant. A column vector and row vector with the same
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59 //! char array, will still return false.
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60
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61 template <typename T>
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62 OCTAVE_API bool
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63 strcmp (const T& str_a, const T& str_b);
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64
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65 //! True if string is the same as character sequence.
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66 //!
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67 //! Compares a string to the null-terminated character sequence
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68 //! beginning at the character pointed to by str_b.
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69 //!
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70 //! ## Specialization for Array<char>
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71 //!
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72 //! For purposes of comparison of dimensions, the character sequence
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73 //! is considered to be a row vector.
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74
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75 template <typename T>
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76 OCTAVE_API bool
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77 strcmp (const T& str_a, const typename T::value_type *str_b);
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78
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79 //! True if strings are the same, ignoring case.
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80 //!
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81 //! ## Specialization for Array<char>
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82 //!
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83 //! When comparing whole Array of chars, the actual Array dimensions
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84 //! are significant. A column vector and row vector with the same
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85 //! char array, will still return false.
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86
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87 template <typename T>
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88 OCTAVE_API bool
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89 strcmpi (const T& str_a, const T& str_b);
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90
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91 //! True if string is the same as character sequence, ignoring case.
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92 //!
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93 //! ## Specialization for Array<char>
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94 //!
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95 //! For purposes of comparison of dimensions, the character sequence
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96 //! is considered to be a row vector.
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98 template <typename T>
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99 OCTAVE_API bool
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100 strcmpi (const T& str_a, const typename T::value_type *str_b);
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102 //! True if the first N characters are the same.
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103 //!
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104 //! ## Specialization for Array<char>
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105 //!
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106 //! The comparison is done in the first N characters, the actual
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107 //! dimensions of the Array are irrelevant. A row vector and
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108 //! a column vector of the same still return true.
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110 template <typename T>
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111 OCTAVE_API bool
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112 strncmp (const T& str_a, const T& str_b,
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113 const typename T::size_type n);
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115 //! True if the first N characters are the same.
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116 template <typename T>
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117 OCTAVE_API bool
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118 strncmp (const T& str_a, const typename T::value_type *str_b,
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119 const typename T::size_type n);
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121 //! True if the first N characters are the same, ignoring case.
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122 //!
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123 //! ## Specialization for Array<char>
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124 //!
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125 //! The comparison is done in the first N characters, the actual
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126 //! dimensions of the Array are irrelevant. A row vector and
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127 //! a column vector of the same still return true.
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129 template <typename T>
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130 OCTAVE_API bool
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131 strncmpi (const T& str_a, const T& str_b,
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132 const typename T::size_type n);
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133
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134 //! True if the first N characters are the same, ignoring case.
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135 template <typename T>
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136 OCTAVE_API bool
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137 strncmpi (const T& str_a, const typename T::value_type *str_b,
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138 const typename T::size_type n);
26127
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139
37e3aa267374 Move function str2double inside octave::string namespace (patch #9084).
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140 extern OCTAVE_API Complex
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141 str2double (const std::string& str_arg);
26702
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142
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143 extern OCTAVE_API std::string
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144 u8_to_encoding (const std::string& who, const std::string& u8_string,
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145 const std::string& encoding);
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146
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147 extern OCTAVE_API std::string
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148 u8_from_encoding (const std::string& who, const std::string& native_string,
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149 const std::string& encoding);
27785
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150
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151 enum u8_fallback_type
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152 {
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153 U8_REPLACEMENT_CHAR,
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154 U8_ISO_8859_1
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155 };
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156
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157 extern OCTAVE_API unsigned int
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158 u8_validate (const std::string& who, std::string& in_string,
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159 const u8_fallback_type type = U8_REPLACEMENT_CHAR);
30822
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160
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161
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162 template<class Facet>
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163 struct
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164 deletable_facet : Facet
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165 {
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166 template<class ...Args>
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167 deletable_facet (Args&& ...args)
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168 : Facet (std::forward<Args> (args)...)
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169 { }
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170
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171 // destructor needs to be public
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172 ~deletable_facet () {}
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173 };
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174
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175 class
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176 OCTAVE_API
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177 codecvt_u8 : public std::codecvt<char, char, std::mbstate_t>
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178 {
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179 public:
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180
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181 // No copying!
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182
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183 codecvt_u8 (codecvt_u8 &) = delete;
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184
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185 codecvt_u8& operator = (codecvt_u8 &) = delete;
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186
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187 codecvt_u8 (const std::string &enc)
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188 : m_enc (enc)
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189 { }
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190
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191 virtual ~codecvt_u8 () { }
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192
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193 typedef char InternT;
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194 typedef char ExternT;
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195 typedef std::mbstate_t StateT;
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196
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197 private:
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198
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199 OCTAVE_API
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200 typename std::codecvt<InternT, ExternT, StateT>::result
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201 do_out (StateT& state,
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202 const InternT* from, const InternT* from_end, const InternT*& from_next,
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203 ExternT* to, ExternT* to_end, ExternT*& to_next) const;
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204
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205 OCTAVE_API
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206 typename std::codecvt<InternT, ExternT, StateT>::result
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207 do_in (StateT& state,
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208 const ExternT* from, const ExternT* from_end, const ExternT*& from_next,
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209 InternT* to, InternT* to_end, InternT*& to_next) const;
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210
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211 typename std::codecvt<InternT, ExternT, StateT>::result
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212 do_unshift (StateT& /* state */, ExternT* to, ExternT* /* to_end */,
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213 ExternT*& to_next) const
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214 {
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215 // FIXME: What is the correct thing to unshift?
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216 // Just reset?
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217 to_next = to;
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218
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219 return std::codecvt<InternT, ExternT, StateT>::ok;
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220 }
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221
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222 int do_encoding () const throw ()
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223 {
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224 // return 0 because UTF-8 encoding is variable length
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225 return 0;
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226 }
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227
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228 bool do_always_noconv () const throw ()
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229 {
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230 // return false to indicate non-identity conversion
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231 return false;
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232 }
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233
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234 OCTAVE_API int
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235 do_length (StateT& state, const ExternT *src, const ExternT *end,
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236 std::size_t max) const;
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237
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238 int do_max_length() const throw ()
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239 {
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240 // For UTF-8, a maximum of 4 bytes are needed for one character.
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241 return 4;
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242 }
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243
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244 std::string m_enc;
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246 };
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247
22280
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248 }
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249 }
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250
26111
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251 template <typename T>
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252 extern OCTAVE_API std::string
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253 rational_approx (T val, int len);
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254
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255 #endif