Subversion Repositories openrisc

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

//

//      vsnprintf.cxx

//

//      ANSI Stdio vsnprintf() 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.

//

// This exception does not invalidate any other reasons why a work based on

// 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:  jlarmour

// Date:        1998-02-13

// 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_write(cyg_stdio_handle_t handle, const 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;

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

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

    // of calling memcpy etc.

    // simply copy string until we run out of user space

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

    {

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

    } // for

    *len = i;

    return ENOERR;

} // str_write()

static DEVIO_TABLE(devio_table,

                   str_write,       // write

                   NULL,            // read

                   NULL,            // select

                   NULL,            // get_config

                   NULL);           // set_config

externC int

vsnprintf( char *s, size_t size, const char *format, va_list arg )

{

    int rc;

    // 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

                         &s);            // private

    Cyg_StdioStream my_stream( &strdev, Cyg_StdioStream::CYG_STREAM_WRITE,

                               false, false, _IONBF, 0, NULL );

    rc = vfnprintf( (FILE *)&my_stream, size, format, arg );

    // Null-terminate it, but note that s has been changed by str_write(), so

    // that it now points to the end of the string

    s[0] = '\0';

    return rc;

} // vsnprintf()

#else

externC int

vsnprintf( char *s, size_t size, const char *format, va_list arg )

{

    int rc;

    Cyg_StdioStream my_stream( Cyg_StdioStream::CYG_STREAM_WRITE,

                               size, (cyg_uint8 *)s );

    rc = vfnprintf( (FILE *)&my_stream, size, format, arg );

    if( rc > 0 )

        s[rc] = '\0';

    return rc;

} // vsnprintf()

#endif

// EOF vsnprintf.cxx