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#ifndef CYGONCE_LIBC_STDIO_STREAMBUF_HXX
#define CYGONCE_LIBC_STDIO_STREAMBUF_HXX
//===========================================================================
//
// streambuf.hxx
//
// Internal C library stdio stream buffer interface definitions
//
//===========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos 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.
//
// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//===========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): jlarmour
// Contributors:
// Date: 2000-04-19
// Purpose:
// Description: This file implements the buffer class used by Cyg_StdioStream
// for file buffers. It is simple, and not thread-safe - that
// is better done at a higher level for our purposes.
// Usage: #include <cyg/libc/stdio/streambuf.hxx>
//
//####DESCRIPTIONEND####
//
//===========================================================================
// CONFIGURATION
#include <pkgconf/libc_stdio.h> // Configuration header
// Include buffered I/O?
#if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
// INCLUDES
#include <cyg/infra/cyg_type.h> // Common project-wide type definitions
#include <errno.h> // Cyg_ErrNo
// TYPE DEFINITIONS
class Cyg_StdioStreamBuffer
{
private:
// Buffering data
#if defined(CYGSEM_LIBC_STDIO_SETVBUF_MALLOC)
cyg_bool call_free; // should we free the old buffer if set_buffer is
// called?
#else
cyg_uint8 static_buffer[BUFSIZ]; // Static buffer used when we cannot
// use malloc()/free().
#endif
cyg_uint8 *buffer_bottom;
cyg_ucount32 buffer_size;
cyg_uint8 *buffer_top;
cyg_uint8 *current_buffer_position;
public:
// CONSTRUCTORS
// You can change the size, or even supply your own buffer, although
// this only has an effect with dynamic buffers. Otherwise it is
// silently ignored
Cyg_StdioStreamBuffer( cyg_ucount32 size=BUFSIZ,
cyg_uint8 *new_buffer=NULL );
// DESTRUCTORS
~Cyg_StdioStreamBuffer();
// METHODS
// Set up the buffer. As with the constructor, supplying a new_buffer
// only has an effect with dynamic buffers, although EINVAL is returned
// in that case. ENOMEM may also be returned
Cyg_ErrNo
set_buffer( cyg_ucount32 size=BUFSIZ, cyg_uint8 *new_buffer=NULL );
// Find out how much buffer space is in use
cyg_ucount32
get_buffer_space_used( void );
// What total size is the current buffer set to be. Can be -1 if the
// the buffer is invalid
cyg_count32
get_buffer_size( void );
// get buffer address to read from, and return the number of bytes
// available to read
cyg_ucount32
get_buffer_addr_to_read( cyg_uint8 **buffer );
// when finished reading from said space, tell the buffer how much was
// actually read
void
set_bytes_read( cyg_ucount32 bytes );
// return address of buffer that can be used to write into, and its
// available capacity
cyg_ucount32
get_buffer_addr_to_write( cyg_uint8 **buffer );
// when finished writing into said space, tell the buffer how much was
// actually written
void
set_bytes_written( cyg_ucount32 bytes );
// just empty the whole buffer contents
void
drain_buffer( void );
}; // class Cyg_StdioStreamBuffer
// INLINE FUNCTIONS
#include <cyg/libc/stdio/streambuf.inl>
#endif // if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
#endif // CYGONCE_LIBC_STDIO_STREAMBUF_HXX multiple inclusion protection
// EOF streambuf.hxx
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