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111
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1 // Stream buffer classes -*- C++ -*-
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2
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145
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3 // Copyright (C) 1997-2020 Free Software Foundation, Inc.
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111
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4 //
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5 // This file is part of the GNU ISO C++ Library. This library is free
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6 // software; you can redistribute it and/or modify it under the
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7 // terms of the GNU General Public License as published by the
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8 // Free Software Foundation; either version 3, or (at your option)
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9 // any later version.
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10
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11 // This library is distributed in the hope that it will be useful,
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12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 // GNU General Public License for more details.
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15
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16 // Under Section 7 of GPL version 3, you are granted additional
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17 // permissions described in the GCC Runtime Library Exception, version
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18 // 3.1, as published by the Free Software Foundation.
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19
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20 // You should have received a copy of the GNU General Public License and
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21 // a copy of the GCC Runtime Library Exception along with this program;
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22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 // <http://www.gnu.org/licenses/>.
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24
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25 /** @file bits/streambuf.tcc
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26 * This is an internal header file, included by other library headers.
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27 * Do not attempt to use it directly. @headername{streambuf}
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28 */
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29
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30 //
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31 // ISO C++ 14882: 27.5 Stream buffers
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32 //
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33
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34 #ifndef _STREAMBUF_TCC
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35 #define _STREAMBUF_TCC 1
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36
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37 #pragma GCC system_header
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38
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39 namespace std _GLIBCXX_VISIBILITY(default)
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40 {
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41 _GLIBCXX_BEGIN_NAMESPACE_VERSION
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42
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43 template<typename _CharT, typename _Traits>
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44 streamsize
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45 basic_streambuf<_CharT, _Traits>::
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46 xsgetn(char_type* __s, streamsize __n)
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47 {
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48 streamsize __ret = 0;
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49 while (__ret < __n)
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50 {
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51 const streamsize __buf_len = this->egptr() - this->gptr();
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52 if (__buf_len)
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53 {
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54 const streamsize __remaining = __n - __ret;
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55 const streamsize __len = std::min(__buf_len, __remaining);
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56 traits_type::copy(__s, this->gptr(), __len);
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57 __ret += __len;
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58 __s += __len;
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59 this->__safe_gbump(__len);
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60 }
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61
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62 if (__ret < __n)
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63 {
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64 const int_type __c = this->uflow();
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65 if (!traits_type::eq_int_type(__c, traits_type::eof()))
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66 {
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67 traits_type::assign(*__s++, traits_type::to_char_type(__c));
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68 ++__ret;
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69 }
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70 else
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71 break;
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72 }
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73 }
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74 return __ret;
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75 }
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76
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77 template<typename _CharT, typename _Traits>
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78 streamsize
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79 basic_streambuf<_CharT, _Traits>::
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80 xsputn(const char_type* __s, streamsize __n)
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81 {
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82 streamsize __ret = 0;
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83 while (__ret < __n)
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84 {
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85 const streamsize __buf_len = this->epptr() - this->pptr();
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86 if (__buf_len)
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87 {
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88 const streamsize __remaining = __n - __ret;
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89 const streamsize __len = std::min(__buf_len, __remaining);
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90 traits_type::copy(this->pptr(), __s, __len);
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91 __ret += __len;
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92 __s += __len;
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93 this->__safe_pbump(__len);
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94 }
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95
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96 if (__ret < __n)
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97 {
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98 int_type __c = this->overflow(traits_type::to_int_type(*__s));
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99 if (!traits_type::eq_int_type(__c, traits_type::eof()))
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100 {
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101 ++__ret;
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102 ++__s;
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103 }
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104 else
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105 break;
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106 }
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107 }
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108 return __ret;
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109 }
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110
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111 // Conceivably, this could be used to implement buffer-to-buffer
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112 // copies, if this was ever desired in an un-ambiguous way by the
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113 // standard.
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114 template<typename _CharT, typename _Traits>
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115 streamsize
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116 __copy_streambufs_eof(basic_streambuf<_CharT, _Traits>* __sbin,
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117 basic_streambuf<_CharT, _Traits>* __sbout,
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118 bool& __ineof)
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119 {
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120 streamsize __ret = 0;
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121 __ineof = true;
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122 typename _Traits::int_type __c = __sbin->sgetc();
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123 while (!_Traits::eq_int_type(__c, _Traits::eof()))
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124 {
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125 __c = __sbout->sputc(_Traits::to_char_type(__c));
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126 if (_Traits::eq_int_type(__c, _Traits::eof()))
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127 {
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128 __ineof = false;
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129 break;
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130 }
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131 ++__ret;
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132 __c = __sbin->snextc();
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133 }
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134 return __ret;
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135 }
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136
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137 template<typename _CharT, typename _Traits>
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138 inline streamsize
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139 __copy_streambufs(basic_streambuf<_CharT, _Traits>* __sbin,
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140 basic_streambuf<_CharT, _Traits>* __sbout)
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141 {
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142 bool __ineof;
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143 return __copy_streambufs_eof(__sbin, __sbout, __ineof);
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144 }
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145
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146 // Inhibit implicit instantiations for required instantiations,
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147 // which are defined via explicit instantiations elsewhere.
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148 #if _GLIBCXX_EXTERN_TEMPLATE
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149 extern template class basic_streambuf<char>;
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150 extern template
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151 streamsize
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152 __copy_streambufs(basic_streambuf<char>*,
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153 basic_streambuf<char>*);
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154 extern template
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155 streamsize
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156 __copy_streambufs_eof(basic_streambuf<char>*,
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157 basic_streambuf<char>*, bool&);
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158
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159 #ifdef _GLIBCXX_USE_WCHAR_T
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160 extern template class basic_streambuf<wchar_t>;
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161 extern template
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162 streamsize
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163 __copy_streambufs(basic_streambuf<wchar_t>*,
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164 basic_streambuf<wchar_t>*);
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165 extern template
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166 streamsize
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167 __copy_streambufs_eof(basic_streambuf<wchar_t>*,
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168 basic_streambuf<wchar_t>*, bool&);
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169 #endif
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170 #endif
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171
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172 _GLIBCXX_END_NAMESPACE_VERSION
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173 } // namespace std
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174
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175 #endif
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