libstdc++-v3/config/c_io_stdio.cc

   1 // Wrapper of C-language FILE struct -*- C++ -*-
   2
   3 // Copyright (C) 2000 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 //
  31 // ISO C++ 14882: 27.8  File-based streams
  32 //
  33
  34 #include <bits/basic_file.h>
  35
  36 namespace std {
  37
  38   // Generic definitions for __basic_file
  39   template<typename _CharT>
  40     __basic_file<_CharT>::__basic_file(__c_lock* /*__lock*/)
  41     : _M_fileno(-1), _M_cfile(NULL) { }
  42
  43   template<typename _CharT>
  44     int
  45     __basic_file<_CharT>::get_fileno(void)
  46     { return _M_fileno; }
  47
  48   template<typename _CharT>
  49     __basic_file<_CharT>::~__basic_file()
  50     {
  51       if (this->is_open())
  52         {
  53           fflush(_M_cfile);
  54           this->close();
  55         }
  56     }
  57
  58   template<typename _CharT>
  59     void
  60     __basic_file<_CharT>::_M_open_mode(ios_base::openmode __mode,
  61                                        int& /*__p_mode*/, int& /*__rw_mode*/,
  62                                        char* __c_mode)
  63     {
  64       bool __testb = __mode & ios_base::binary;
  65       bool __testi = __mode & ios_base::in;
  66       bool __testo = __mode & ios_base::out;
  67       bool __testt = __mode & ios_base::trunc;
  68       bool __testa = __mode & ios_base::app;
  69
  70       if (!__testi && __testo && !__testt && !__testa)
  71         strcpy(__c_mode, "w");
  72       if (!__testi && __testo && !__testt && __testa)
  73         strcpy(__c_mode, "a");
  74       if (!__testi && __testo && __testt && !__testa)
  75         strcpy(__c_mode, "w");
  76       if (__testi && !__testo && !__testt && !__testa)
  77         strcpy(__c_mode, "r");
  78       if (__testi && __testo && !__testt && !__testa)
  79         strcpy(__c_mode, "r+");
  80       if (__testi && __testo && __testt && !__testa)
  81         strcpy(__c_mode, "w+");
  82       if (__testb)
  83         strcat(__c_mode, "b");
  84     }
  85
  86   template<typename _CharT>
  87     __basic_file<_CharT>*
  88     __basic_file<_CharT>::sys_open(int __fd, ios_base::openmode __mode)
  89     {
  90       __basic_file* __ret = NULL;
  91       int __p_mode = 0;
  92       int __rw_mode = 0;
  93       char __c_mode[4];
  94
  95       _M_open_mode(__mode, __p_mode, __rw_mode, __c_mode);
  96
  97       if (!this->is_open())
  98         {
  99           if ((_M_cfile = fdopen(__fd, __c_mode)))
 100             {
 101               _M_fileno = __fd;
 102               __ret = this;
 103             }
 104         }
 105       return __ret;
 106     }
 107
 108   template<typename _CharT>
 109     __basic_file<_CharT>*
 110     __basic_file<_CharT>::open(const char* __name, ios_base::openmode __mode,
 111                                int /*__prot*/)
 112     {
 113       __basic_file* __ret = NULL;
 114       int __p_mode = 0;
 115       int __rw_mode = 0;
 116       char __c_mode[4];
 117
 118       _M_open_mode(__mode, __p_mode, __rw_mode, __c_mode);
 119
 120       if (!this->is_open())
 121         {
 122           if ((_M_cfile = fopen(__name, __c_mode)))
 123             {
 124               _M_fileno = fileno(_M_cfile);
 125               __ret = this;
 126             }
 127         }
 128       return __ret;
 129     }
 130
 131   template<typename _CharT>
 132     bool
 133     __basic_file<_CharT>::is_open() { return _M_fileno >= 0; }
 134
 135   template<typename _CharT>
 136     __basic_file<_CharT>*
 137     __basic_file<_CharT>::close()
 138     {
 139       __basic_file* __retval = static_cast<__basic_file*>(NULL);
 140       bool __testopen = fclose(_M_cfile);
 141       if (!__testopen)
 142         {
 143           __retval = this;
 144           _M_fileno = -1;
 145         }
 146       return __retval;
 147     }
 148
 149   template<typename _CharT>
 150     streamsize
 151     __basic_file<_CharT>::xsgetn(_CharT* __s, streamsize __n)
 152     { return fread(__s, 1, __n, _M_cfile); }
 153
 154   template<typename _CharT>
 155     streamsize
 156     __basic_file<_CharT>::xsputn(const _CharT* __s, streamsize __n)
 157     { return fwrite(__s, 1, __n, _M_cfile); }
 158
 159   template<typename _CharT>
 160     streamoff
 161     __basic_file<_CharT>::seekoff(streamoff __off, ios_base::seekdir __way,
 162                                   ios_base::openmode /*__mode*/)
 163    { return fseek(_M_cfile, __off, __way); }
 164
 165   template<typename _CharT>
 166     streamoff
 167     __basic_file<_CharT>::seekpos(streamoff __pos,
 168                                   ios_base::openmode /*__mode*/)
 169    { return fseek(_M_cfile, __pos, ios_base::beg); }
 170
 171   template<typename _CharT>
 172     int
 173     __basic_file<_CharT>::sync()
 174     { return fflush(_M_cfile); }
 175
 176   // NB: Unused.
 177   template<typename _CharT>
 178     int
 179     __basic_file<_CharT>::overflow(int /*__c*/)
 180     { return EOF; }
 181
 182   // NB: Unused.
 183   template<typename _CharT>
 184     int
 185     __basic_file<_CharT>::underflow()
 186     { return EOF; }
 187
 188   // NB: Unused.
 189   template<typename _CharT>
 190     int
 191     __basic_file<_CharT>::uflow()
 192     { return EOF; }
 193
 194   // NB: Unused.
 195   template<typename _CharT>
 196     int
 197     __basic_file<_CharT>::pbackfail(int /*__c*/)
 198     { return EOF; }
 199
 200  // NB: Unused.
 201   template<typename _CharT>
 202     streambuf*
 203     __basic_file<_CharT>::setbuf(_CharT* /*__b*/, int /*__len*/)
 204     { return reinterpret_cast<streambuf*>(this); }
 205
 206   // NB: Unused.
 207   template<typename _CharT>
 208     int
 209     __basic_file<_CharT>::doallocate()
 210     { return EOF; }
 211
 212   // NB: Unused.
 213   template<typename _CharT>
 214     streamsize
 215     __basic_file<_CharT>::sys_read(_CharT* __s, streamsize __n)
 216     { return fread(__s, 1, __n, _M_cfile); }
 217
 218   // NB: Unused.
 219   template<typename _CharT>
 220     streamsize
 221     __basic_file<_CharT>::sys_write(const _CharT* __s, streamsize __n)
 222     { return fwrite(__s, 1, __n, _M_cfile); }
 223
 224   // NB: Unused.
 225   template<typename _CharT>
 226     streamoff
 227     __basic_file<_CharT>::sys_seek(streamoff __pos, ios_base::seekdir __way)
 228    { return fseek(_M_cfile, __pos, __way); }
 229
 230   // NB: Unused.
 231   template<typename _CharT>
 232     int
 233     __basic_file<_CharT>::sys_close()
 234     { return fclose(_M_cfile); }
 235
 236   // NB: Unused.
 237   template<typename _CharT>
 238     int
 239     __basic_file<_CharT>::sys_stat(void* /*__v*/)
 240     { return EOF; }
 241
 242   // NB: Unused.
 243   template<typename _CharT>
 244     int
 245     __basic_file<_CharT>::showmanyc()
 246     { return EOF; }
 247
 248   // NB: Unused.
 249   template<typename _CharT>
 250     void
 251     __basic_file<_CharT>::imbue(void* /*__v*/) { }
 252
 253   // Need to instantiate base class here for type-info bits, etc
 254   template struct __basic_file_base<char>;
 255   template class __basic_file<char>;
 256 #ifdef _GLIBCPP_USE_WCHAR_T
 257   template struct __basic_file_base<wchar_t>;
 258   template class __basic_file<wchar_t>;
 259 #endif
 260 }  // namespace std
 261
 262