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//===========================================================================

//

//      vsscanf.cxx

//

//      ANSI Stdio vsscanf() function

//

//===========================================================================

//####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

// 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.,

// 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

// 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.

//

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// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

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

//####ECOSGPLCOPYRIGHTEND####

//===========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    jlarmour

// Contributors: 

// Date:         2000-04-20

// Purpose:     

// Description: 

// Usage:       

//

//####DESCRIPTIONEND####

//

//===========================================================================

// CONFIGURATION

#include <pkgconf/libc_stdio.h>   // Configuration header

// INCLUDES

#include <cyg/infra/cyg_type.h>     // Common project-wide type definitions

#include <stddef.h>                 // NULL and size_t from compiler

#include <stdio.h>                  // header for this file

#include <errno.h>                  // error codes

#include <cyg/io/devtab.h>          // Device table

#include <cyg/libc/stdio/stream.hxx>// Cyg_StdioStream

#include <cyg/libc/stdio/io.inl>     // I/O system inlines

#ifndef CYGPKG_LIBC_STDIO_FILEIO

// FUNCTIONS

static Cyg_ErrNo

str_read(cyg_stdio_handle_t handle, void *buf, cyg_uint32 *len)

{

    cyg_devtab_entry_t *dev = (cyg_devtab_entry_t *)handle;

    cyg_uint8 *str_p = (cyg_uint8 *)dev->priv;

    cyg_ucount32 i;

    // we set str_p to NULL further down when the string has finished being

    // read

    if (str_p == NULL)

    {

        *len = 0;

        return ENOERR;

    } // if

    // I suspect most strings passed to sprintf will be relatively short,

    // so we just take the simple approach rather than have the overhead

    // of calling memcpy etc.

    // copy string until run out of user space, or we reach its end

    for (i = 0; i < *len ; ++i)

    {

        *((cyg_uint8 *)buf + i) = *str_p;

        if (*str_p++ == '\0')

        {

            str_p = NULL;

            ++i;

            break;

        } // if

    } // for

    *len = i;

    dev->priv = (void *)str_p;

    return ENOERR;

} // str_read()

static DEVIO_TABLE(devio_table,

                   NULL,            // write

                   str_read,        // read

                   NULL,            // select

                   NULL,            // get_config

                   NULL);           // set_config

externC int

vsscanf( const char *s, const char *format, va_list arg )

{

    // construct a fake device with the address of the string we've

    // been passed as its private data. This way we can use the data

    // directly

    DEVTAB_ENTRY_NO_INIT(strdev,

                         "strdev",       // Name

                         NULL,           // Dependent name (layered device)

                         &devio_table,   // I/O function table

                         NULL,           // Init

                         NULL,           // Lookup

                         (void *)s);     // private

    Cyg_StdioStream my_stream( &strdev, Cyg_StdioStream::CYG_STREAM_READ,

                               false, false, _IONBF, 0, NULL );

    return vfscanf( (FILE *)&my_stream, format, arg );

} // vsscanf()

#else

externC int

vsscanf( const char *s, const char *format, va_list arg )

{

    Cyg_StdioStream my_stream( Cyg_StdioStream::CYG_STREAM_READ,

                               strlen(s), (cyg_uint8 *)s );

    return vfscanf( (FILE *)&my_stream, format, arg );

} // vsscanf()

#endif

// EOF vsscanf.cxx