libstdc++-v3/config/basic_file_libio.h

   1 // Wrapper of C-language FILE struct -*- C++ -*-
   2
   3 // Copyright (C) 2000, 2001 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 <libioP.h>
  35
  36 namespace std
  37 {
  38   // __basic_file<char> specializations
  39   template<>
  40     __basic_file<char>::__basic_file(__c_lock* __lock);
  41
  42   template<>
  43     int
  44     __basic_file<char>::overflow(int __c);
  45
  46   template<>
  47     int
  48     __basic_file<char>::underflow();
  49
  50   template<>
  51     int
  52     __basic_file<char>::uflow();
  53
  54   template<>
  55     int
  56     __basic_file<char>::pbackfail(int __c);
  57
  58   template<>
  59     streamsize
  60     __basic_file<char>::xsputn(const char* __s, streamsize __n);
  61
  62   template<>
  63     streamoff
  64     __basic_file<char>::seekoff(streamoff __off, ios_base::seekdir __way,
  65                                 ios_base::openmode __mode);
  66
  67   template<>
  68     streamoff
  69     __basic_file<char>::seekpos(streamoff __pos, ios_base::openmode __mode);
  70
  71   template<>
  72     streambuf*
  73     __basic_file<char>::setbuf(char* __b, int __len);
  74
  75   template<>
  76     int
  77     __basic_file<char>::sync();
  78
  79   template<>
  80     int
  81     __basic_file<char>::doallocate();
  82
  83   // __basic_file<wchar_t> specializations
  84 #ifdef _GLIBCPP_USE_WCHAR_T
  85   template<>
  86     __basic_file<wchar_t>::__basic_file(__c_lock* __lock);
  87
  88   template<>
  89     int
  90     __basic_file<wchar_t>::overflow(int __c);
  91
  92   template<>
  93     int
  94     __basic_file<wchar_t>::underflow();
  95
  96   template<>
  97     int
  98     __basic_file<wchar_t>::uflow();
  99
 100   template<>
 101     int
 102     __basic_file<wchar_t>::pbackfail(int __c);
 103
 104   template<>
 105     streamsize
 106     __basic_file<wchar_t>::xsputn(const wchar_t* __s, streamsize __n);
 107
 108   template<>
 109     streamoff
 110     __basic_file<wchar_t>::seekoff(streamoff __off, ios_base::seekdir __way,
 111                                 ios_base::openmode __mode);
 112
 113   template<>
 114     streamoff
 115     __basic_file<wchar_t>::seekpos(streamoff __pos, ios_base::openmode __mode);
 116
 117   template<>
 118     streambuf*
 119     __basic_file<wchar_t>::setbuf(wchar_t* __b, int __len);
 120
 121   template<>
 122     int
 123     __basic_file<wchar_t>::sync();
 124
 125   template<>
 126     int
 127     __basic_file<wchar_t>::doallocate();
 128 #endif
 129
 130   template<typename _CharT>
 131     __basic_file<_CharT>::~__basic_file()
 132     { _IO_file_finish(this, 0); }
 133
 134   template<typename _CharT>
 135     void
 136     __basic_file<_CharT>::_M_open_mode(ios_base::openmode __mode,
 137                                        int& __p_mode, int& __rw_mode,
 138                                        char* /*__c_mode*/)
 139     {
 140 #ifdef O_BINARY
 141       bool __testb = __mode & ios_base::binary;
 142 #endif
 143       bool __testi = __mode & ios_base::in;
 144       bool __testo = __mode & ios_base::out;
 145       bool __testt = __mode & ios_base::trunc;
 146       bool __testa = __mode & ios_base::app;
 147
 148       if (!__testi && __testo && !__testt && !__testa)
 149         {
 150           __p_mode = O_WRONLY | O_TRUNC | O_CREAT;
 151           __rw_mode = _IO_NO_READS;
 152         }
 153       if (!__testi && __testo && !__testt && __testa)
 154         {
 155           __p_mode = O_WRONLY | O_APPEND | O_CREAT;
 156           __rw_mode = _IO_NO_READS | _IO_IS_APPENDING;
 157         }
 158       if (!__testi && __testo && __testt && !__testa)
 159         {
 160           __p_mode = O_WRONLY | O_TRUNC | O_CREAT;
 161           __rw_mode = _IO_NO_READS;
 162         }
 163       if (__testi && !__testo && !__testt && !__testa)
 164         {
 165           __p_mode = O_RDONLY;
 166           __rw_mode = _IO_NO_WRITES;
 167         }
 168       if (__testi && __testo && !__testt && !__testa)
 169         {
 170           __p_mode = O_RDWR;
 171           __rw_mode = 0;
 172         }
 173       if (__testi && __testo && __testt && !__testa)
 174         {
 175           __p_mode = O_RDWR | O_TRUNC | O_CREAT;
 176           __rw_mode = 0;
 177         }
 178 #ifdef O_BINARY
 179       if (__testb)
 180         __p_mode |= O_BINARY;
 181 #endif
 182     }
 183
 184   template<typename _CharT>
 185     __basic_file<_CharT>*
 186     __basic_file<_CharT>::sys_open(__c_file_type* __f,
 187                                    ios_base::openmode __mode)
 188     {
 189       __basic_file* __ret = NULL;
 190       int __fd = fileno(__f);
 191       int __p_mode = 0;
 192       int __rw_mode = _IO_NO_READS + _IO_NO_WRITES;
 193       char __c_mode[4];
 194
 195       _M_open_mode(__mode, __p_mode, __rw_mode, __c_mode);
 196
 197       if (!_IO_file_is_open(this))
 198         {
 199           _fileno = __fd;
 200           _flags &= ~(_IO_NO_READS + _IO_NO_WRITES);
 201           _flags |= _IO_DELETE_DONT_CLOSE;
 202           _offset = _IO_pos_BAD;
 203           int __mask = _IO_NO_READS + _IO_NO_WRITES + _IO_IS_APPENDING;
 204           _IO_mask_flags(this, __rw_mode, __mask);
 205         }
 206
 207       return __ret;
 208     }
 209
 210   template<typename _CharT>
 211     __basic_file<_CharT>*
 212     __basic_file<_CharT>::open(const char* __name, ios_base::openmode __mode,
 213                                int __prot)
 214     {
 215       __basic_file* __ret = NULL;
 216       int __p_mode = 0;
 217       int __rw_mode = _IO_NO_READS + _IO_NO_WRITES;
 218       char __c_mode[4];
 219
 220       _M_open_mode(__mode, __p_mode, __rw_mode, __c_mode);
 221       if (!_IO_file_is_open(this))
 222         {
 223           __c_file_type* __f;
 224           __f = _IO_file_open(this, __name, __p_mode, __prot, __rw_mode, 0);
 225           __ret = __f ? this: NULL;
 226         }
 227       return __ret;
 228     }
 229
 230   template<typename _CharT>
 231     bool
 232     __basic_file<_CharT>::is_open() { return _fileno >= 0; }
 233
 234   template<typename _CharT>
 235     __basic_file<_CharT>*
 236     __basic_file<_CharT>::close()
 237     {
 238       return _IO_file_close_it(this) ? static_cast<__basic_file*>(NULL) : this;
 239     }
 240
 241   template<typename _CharT>
 242     streamsize
 243     __basic_file<_CharT>::xsgetn(_CharT* __s, streamsize __n)
 244     { return _IO_file_xsgetn(this, __s, __n); }
 245
 246   // NB: Unused.
 247   template<typename _CharT>
 248     streamsize
 249     __basic_file<_CharT>::sys_read(_CharT* __s, streamsize __n)
 250     { return _IO_file_read(this, __s, __n); }
 251
 252   // NB: Unused.
 253   template<typename _CharT>
 254     streamsize
 255     __basic_file<_CharT>::sys_write(const _CharT* __s, streamsize __n)
 256     { return _IO_file_write(this, __s, __n); }
 257
 258   // NB: Unused.
 259   template<typename _CharT>
 260     streamoff
 261     __basic_file<_CharT>::sys_seek(streamoff __pos, ios_base::seekdir __way)
 262     { return _IO_file_seek(this, __pos, __way); }
 263
 264   // NB: Unused.
 265   template<typename _CharT>
 266     int
 267     __basic_file<_CharT>::sys_close()
 268     { return _IO_file_close(this); }
 269
 270   // NB: Unused.
 271   template<typename _CharT>
 272     int
 273     __basic_file<_CharT>::sys_stat(void* __v)
 274     { return _IO_file_stat(this, __v); }
 275
 276   // NB: Unused.
 277   template<typename _CharT>
 278     int
 279     __basic_file<_CharT>::showmanyc() { return EOF; }
 280
 281   // NB: Unused.
 282   template<typename _CharT>
 283     void
 284     __basic_file<_CharT>::imbue(void* /*__v*/) { }
 285 }  // namespace std