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//===========================================================================
//
// fgetc.cxx
//
// ISO C standard I/O get character 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: Provide the fgetc() function. Also provides the function
// version of getc() and getchar()
// Description:
// Usage:
//
//####DESCRIPTIONEND####
//
//===========================================================================
// CONFIGURATION
#include <pkgconf/libc_stdio.h> // Configuration header
// INCLUDES
#include <cyg/infra/cyg_type.h> // Common project-wide type definitions
#include <cyg/infra/cyg_ass.h> // Standard eCos assertion support
#include <cyg/infra/cyg_trac.h> // Standard eCos tracing support
#include <stddef.h> // NULL and size_t from compiler
#include <stdio.h> // header for this file
#include <errno.h> // error codes
#include <cyg/libc/stdio/stream.hxx>// Cyg_StdioStream
// FUNCTIONS
externC int
fgetc( FILE *stream ) __THROW
{
Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
cyg_ucount32 bytes_read;
Cyg_ErrNo err;
cyg_uint8 c;
CYG_REPORT_FUNCNAMETYPE("fgetc", "returning char %d");
CYG_REPORT_FUNCARG1XV( stream );
CYG_CHECK_DATA_PTR( stream, "stream is not a valid pointer" );
err = real_stream->read( &c, 1, &bytes_read );
// Why do we need this? Because the buffer might be empty.
if (!err && !bytes_read) { // if no err, but nothing to read, try again
err = real_stream->refill_read_buffer();
if ( !err )
err = real_stream->read( &c, 1, &bytes_read );
} // if
CYG_ASSERT( (ENOERR != err) || (1 == bytes_read), "Didn't read 1 byte!" );
if (err)
{
if ( EAGAIN != err ) {
real_stream->set_error( err );
errno = err;
}
CYG_REPORT_RETVAL(EOF);
return EOF;
} // if
CYG_REPORT_RETVAL((int)c);
return (int)c;
} // fgetc()
// Also define getc() even though it can be a macro.
// Undefine it first though
#undef getchar
externC int
getchar( void ) __THROW
{
return fgetc( stdin );
} // getchar()
// EXPORTED SYMBOLS
// Also define getc() even though it can be a macro.
// Undefine it first though
#undef getc
externC int
getc( FILE * ) __THROW CYGBLD_ATTRIB_WEAK_ALIAS(fgetc);
// EOF fgetc.cxx
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