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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 Red Hat, 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

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// 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.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 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

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// -------------------------------------------

//####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 )

{

    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 )

{

    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 * ) CYGBLD_ATTRIB_WEAK_ALIAS(fgetc);

// EOF fgetc.cxx