libio/filebuf.cc

   1 /* This is part of libio/iostream, providing -*- C++ -*- input/output.
   2 Copyright (C) 1993, 1995, 1999 Free Software Foundation
   3
   4 This file is part of the GNU IO Library.  This library is free
   5 software; you can redistribute it and/or modify it under the
   6 terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 This library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this library; see the file COPYING.  If not, write to the Free
  17 Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 As a special exception, if you link this library with files
  20 compiled with a GNU compiler to produce an executable, this does not cause
  21 the resulting executable to be covered by the GNU General Public License.
  22 This exception does not however invalidate any other reasons why
  23 the executable file might be covered by the GNU General Public License.
  24
  25 Written by Per Bothner (bothner@cygnus.com). */
  26
  27 #include "iostreamP.h"
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <errno.h>
  32 #include "builtinbuf.h"
  33
  34 void filebuf::init()
  35 {
  36   _IO_file_init(this);
  37 }
  38
  39 filebuf::filebuf()
  40 {
  41   _IO_file_init(this);
  42 }
  43
  44 #if !_IO_UNIFIED_JUMPTABLES
  45 /* This is like "new filebuf()", but it uses the _IO_file_jump jumptable,
  46    for eficiency. */
  47
  48 filebuf* filebuf::__new()
  49 {
  50   filebuf *fb = new filebuf;
  51   _IO_JUMPS(fb) = &_IO_file_jumps;
  52   fb->_vtable() = builtinbuf_vtable;
  53   return fb;
  54 }
  55 #endif
  56
  57 filebuf::filebuf(int fd)
  58 {
  59   _IO_file_init(this);
  60   _IO_file_attach(this, fd);
  61 }
  62
  63 filebuf::filebuf(int fd, char* p, int len)
  64 {
  65   _IO_file_init(this);
  66   _IO_file_attach(this, fd);
  67   setbuf(p, len);
  68 }
  69
  70 filebuf::~filebuf()
  71 {
  72   if (_IO_file_is_open(this))
  73     {
  74       _IO_do_flush (this);
  75       if (!(xflags() & _IO_DELETE_DONT_CLOSE))
  76         _IO_SYSCLOSE (this);
  77     }
  78 }
  79
  80 filebuf* filebuf::open(const char *filename, ios::openmode mode, int prot)
  81 {
  82   if (_IO_file_is_open (this))
  83     return NULL;
  84   int posix_mode;
  85   int read_write;
  86   if (mode & ios::app)
  87     mode |= ios::out;
  88   if ((mode & (ios::in|ios::out)) == (ios::in|ios::out)) {
  89     posix_mode = O_RDWR;
  90     read_write = 0;
  91   }
  92   else if (mode & ios::out)
  93     posix_mode = O_WRONLY, read_write = _IO_NO_READS;
  94   else if (mode & (int)ios::in)
  95     posix_mode = O_RDONLY, read_write = _IO_NO_WRITES;
  96   else
  97     posix_mode = 0, read_write = _IO_NO_READS+_IO_NO_WRITES;
  98   if (mode & ios::binary)
  99     {
 100       mode &= ~ios::binary;
 101 #ifdef O_BINARY
 102       /* This is a (mis-)feature of DOS/Windows C libraries. */
 103       posix_mode |= O_BINARY;
 104 #endif
 105     }
 106   if ((mode & (int)ios::trunc) || mode == (int)ios::out)
 107     posix_mode |= O_TRUNC;
 108   if (mode & ios::app)
 109     posix_mode |= O_APPEND, read_write |= _IO_IS_APPENDING;
 110   if (!(mode & (int)ios::nocreate) && mode != ios::in)
 111     posix_mode |= O_CREAT;
 112   if (mode & (int)ios::noreplace)
 113     posix_mode |= O_EXCL;
 114 #if _G_HAVE_IO_FILE_OPEN
 115   if (!_IO_file_open (this, filename, posix_mode, prot,
 116                       read_write, 0))
 117     return NULL;
 118   if (mode & ios::ate) {
 119     if (pubseekoff(0, ios::end) == EOF) {
 120       _IO_un_link (this);
 121       return NULL;
 122     }
 123   }
 124   return this;
 125 #else
 126   int fd = ::open(filename, posix_mode, prot);
 127   if (fd < 0)
 128     return NULL;
 129   _fileno = fd;
 130   xsetflags(read_write, _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
 131   if (mode & ios::ate) {
 132     if (pubseekoff(0, ios::end) == EOF)
 133       return NULL;
 134   }
 135   _IO_link_in(this);
 136   return this;
 137 #endif
 138 }
 139
 140 filebuf* filebuf::open(const char *filename, const char *mode)
 141 {
 142 #if _G_IO_IO_FILE_VERSION == 0x20001
 143   return (filebuf*)_IO_file_fopen(this, filename, mode, 0);
 144 #else
 145   return (filebuf*)_IO_file_fopen(this, filename, mode);
 146 #endif
 147 }
 148
 149 filebuf* filebuf::attach(int fd)
 150 {
 151   return (filebuf*)_IO_file_attach(this, fd);
 152 }
 153
 154 streambuf* filebuf::setbuf(char* p, int len)
 155 {
 156   return (streambuf*)_IO_file_setbuf (this, p, len);
 157 }
 158
 159 int filebuf::doallocate() { return _IO_file_doallocate(this); }
 160
 161 int filebuf::overflow(int c)
 162 {
 163   return _IO_file_overflow(this, c);
 164 }
 165
 166 int filebuf::underflow()
 167 {
 168   return _IO_file_underflow(this);
 169 }
 170
 171 int filebuf::sync()
 172 {
 173   return _IO_file_sync(this);
 174 }
 175
 176 streampos filebuf::seekoff(streamoff offset, _seek_dir dir, int mode)
 177 {
 178   return _IO_file_seekoff (this, offset, dir, mode);
 179 }
 180
 181 filebuf* filebuf::close()
 182 {
 183   return (_IO_file_close_it(this) ? (filebuf*)NULL : this);
 184 }
 185
 186 streamsize filebuf::sys_read(char* buf, streamsize size)
 187 {
 188   return _IO_file_read(this, buf, size);
 189 }
 190
 191 streampos filebuf::sys_seek(streamoff offset, _seek_dir dir)
 192 {
 193   return _IO_file_seek(this, offset, dir);
 194 }
 195
 196 streamsize filebuf::sys_write(const char *buf, streamsize n)
 197 {
 198   return _IO_file_write (this, buf, n);
 199 }
 200
 201 int filebuf::sys_stat(void* st)
 202 {
 203   return _IO_file_stat (this, st);
 204 }
 205
 206 int filebuf::sys_close()
 207 {
 208   return _IO_file_close (this);
 209 }
 210
 211 streamsize filebuf::xsputn(const char *s, streamsize n)
 212 {
 213   return _IO_file_xsputn(this, s, n);
 214 }
 215
 216 streamsize filebuf::xsgetn(char *s, streamsize n)
 217 {
 218     // FIXME: OPTIMIZE THIS (specifically, when unbuffered()).
 219     return streambuf::xsgetn(s, n);
 220 }
 221
 222 // Non-ANSI AT&T-ism:  Default open protection.
 223 const int filebuf::openprot = 0644;