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

//

//      memmove.cxx

//

//      ANSI standard memmove() routine

//

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

//####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

// by itself cause the resulting work to be covered by the GNU General Public

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//####ECOSGPLCOPYRIGHTEND####

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

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

//

// Author(s):     jlarmour

// Contributors:  

// Date:          2000-04-14

// Purpose:     

// Description: 

// Usage:       

//

//####DESCRIPTIONEND####

//

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

// CONFIGURATION

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

// INCLUDES

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

#include <cyg/infra/cyg_trac.h>    // Tracing support

#include <cyg/infra/cyg_ass.h>     // Assertion support

#include <string.h>                // Header for this file

#include <stddef.h>         // Compiler definitions such as size_t, NULL etc.

#include <cyg/libc/string/stringsupp.hxx> // Useful string function support and

                                          // prototypes

// EXPORTED SYMBOLS

externC void *

memmove( void *s1, const void *s2, size_t n ) \

    CYGBLD_ATTRIB_WEAK_ALIAS(__memmove);

// FUNCTIONS

void *

__memmove( void *s1, const void *s2, size_t n )

{

    char *dst = (char *)s1;

    const char *src = (const char *)s2;

    CYG_REPORT_FUNCNAMETYPE( "__memmove", "returning %08x" );

    CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n );

    if (n)

    {

        CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" );

        CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" );

    }

    if ((src < dst) && (dst < (src + n)))

    {

        // Have to copy backwards

        src += n;

        dst += n;

        while (n--)

        {

            *--dst = *--src;

        }

    }

    else

    {

        while (n--)

        {

            *dst++ = *src++;

        }

    }

    CYG_REPORT_RETVAL( s1 );

    return s1;

} // __memmove()

// EOF memmove.cxx