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//===========================================================================
//
// streambuf.cxx
//
// C library stdio stream buffer functions
//
//===========================================================================
// ####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: 2000-04-20
// Purpose:
// Description:
// Usage:
//
//####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 <cyg/infra/cyg_ass.h> // Assertion support
#include <errno.h> // Cyg_ErrNo
#include <stdlib.h> // malloc() and free()
#include <cyg/libc/stdio/streambuf.hxx> // header for this file, just in case
// FUNCTIONS
Cyg_ErrNo
Cyg_StdioStreamBuffer::set_buffer( cyg_ucount32 size,
cyg_uint8 *new_buffer )
{
#ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
// user-supplied buffer?
if (new_buffer != NULL) {
CYG_CHECK_DATA_PTR(new_buffer, "new_buffer not valid");
#ifdef CYGSEM_LIBC_STDIO_SETVBUF_MALLOC
// first check if we were responsible for the old buffer
if (call_free) {
free(buffer_bottom);
call_free = false;
}
#endif
buffer_bottom = new_buffer;
}
#ifdef CYGSEM_LIBC_STDIO_SETVBUF_MALLOC
else if ( size != buffer_size ) { // as long as its different from
// what we've got now
cyg_uint8 *malloced_buf;
malloced_buf = (cyg_uint8 * )malloc( size );
if (malloced_buf == NULL)
return ENOMEM;
// should the old buffer be freed? This waits till after we know
// whether the malloc succeeded
if (call_free)
free( buffer_bottom );
buffer_bottom = malloced_buf;
call_free=true;
} // else if
#else
// Here we have not been given a new buffer, but have been given
// a new buffer size. If possible, we just shrink what we already
// have.
else if( size > buffer_size )
return EINVAL;
#endif
#else // ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
// In this config we can't use a different buffer, or set a
// size greater than now. We can pretend to shrink it though
// Note on the next line we compare it with the size of static_buffer
// and not the current size, as that's what is the limiting factor
if ( (new_buffer != NULL) || (size > sizeof(static_buffer)) )
return EINVAL;
#endif // ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
buffer_top = current_buffer_position = &buffer_bottom[0];
buffer_size = size;
return ENOERR;
} // set_buffer()
#endif // if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
// EOF streambuf.cxx
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