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Diffstat (limited to 'libio/stdiostream.cc')
| -rw-r--r-- | libio/stdiostream.cc | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/libio/stdiostream.cc b/libio/stdiostream.cc deleted file mode 100644 index ee0907b..0000000 --- a/libio/stdiostream.cc +++ /dev/null @@ -1,159 +0,0 @@ -/* This is part of libio/iostream, providing -*- C++ -*- input/output. -Copyright (C) 1993 Free Software Foundation - -This file is part of the GNU IO Library. This library is free -software; you can redistribute it and/or modify it under the -terms of the GNU General Public License as published by the -Free Software Foundation; either version 2, or (at your option) -any later version. - -This library is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this library; see the file COPYING. If not, write to the Free -Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - -As a special exception, if you link this library with files -compiled with a GNU compiler to produce an executable, this does not cause -the resulting executable to be covered by the GNU General Public License. -This exception does not however invalidate any other reasons why -the executable file might be covered by the GNU General Public License. */ - -/* Written by Per Bothner (bothner@cygnus.com). */ - -#ifdef __GNUG__ -#pragma implementation -#endif - -#include "libioP.h" -#include <stdiostream.h> - -// A stdiobuf is "tied" to a FILE object (as used by the stdio package). -// Thus a stdiobuf is always synchronized with the corresponding FILE, -// though at the cost of some overhead. (If you use the implementation -// of stdio supplied with this library, you don't need stdiobufs.) -// This implementation inherits from filebuf, but implement the virtual -// functions sys_read/..., using the stdio functions fread/... instead -// of the low-level read/... system calls. This has the advantage that -// we get all of the nice filebuf semantics automatically, though -// with some overhead. - - -#ifndef SEEK_SET -#define SEEK_SET 0 -#endif -#ifndef SEEK_CUR -#define SEEK_CUR 1 -#endif -#ifndef SEEK_END -#define SEEK_END 2 -#endif - -stdiobuf::stdiobuf(FILE *f) : filebuf(fileno(f)) -{ - _file = f; - // Turn off buffer in stdiobuf. Instead, rely on buffering in (FILE). - // Thus the stdiobuf will be synchronized with the FILE. - setbuf(NULL, 0); -} - -stdiobuf::~stdiobuf() -{ - /* Only needed if we're buffered. Not buffered is the default. */ - _IO_do_flush((_IO_FILE*)this); -} - -streamsize stdiobuf::sys_read(char* buf, streamsize size) -{ - // A minor optimization, but it makes a noticable difference. - // A bigger optimization would be to write stdiobuf::underflow, - // but that has some modularity disadvantages. Re-evaluate that - // after we have gotten rid of the double indirection. FIXME - if (size == 1) - { - register int ch = getc(_file); - if (ch == EOF) - return 0; - *buf = (char)ch; - return 1; - } - else - return fread(buf, 1, size, _file); -} - -streamsize stdiobuf::sys_write(const char *buf, streamsize n) -{ - _IO_ssize_t count = fwrite(buf, 1, n, _file); - if (_offset >= 0) - _offset += n; - return count; -} - -streampos stdiobuf::sys_seek(streamoff offset, _seek_dir dir) -{ - // Normally, equivalent to: fdir=dir - int fdir = - (dir == ios::beg) ? SEEK_SET : - (dir == ios::cur) ? SEEK_CUR : - (dir == ios::end) ? SEEK_END : - dir; - return fseek(_file, offset, fdir); -} - -int stdiobuf::sys_close() -{ - int status = fclose(_file); - _file = NULL; - return status; -} - -int stdiobuf::sync() -{ - if (_IO_do_flush((_IO_FILE*)this)) - return EOF; - if (!(xflags() & _IO_NO_WRITES)) - if (fflush(_file)) - return EOF; - return 0; -} - -int stdiobuf::overflow(int c /* = EOF*/) -{ - if (filebuf::overflow(c) == EOF) - return EOF; - if (c != EOF) - return c; - return fflush(_file); -} - -streamsize stdiobuf::xsputn(const char* s, streamsize n) -{ - if (buffered ()) - { - // The filebuf implementation of sputn loses. - return streambuf::xsputn(s, n); - } - else - return fwrite (s, 1, n, _file); -} - -void stdiobuf::buffered (int b) -{ - if (b) - { - if (_flags & _IO_UNBUFFERED) - { /* Was unbuffered, make it buffered. */ - _flags &= ~_IO_UNBUFFERED; - } - } - else - { - if (!(_flags & _IO_UNBUFFERED)) - { /* Was buffered, make it unbuffered. */ - setbuf(NULL, 0); - } - } -} |