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

//

//      strncpy.cxx

//

//      ISO C standard strncpy() 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

// 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:  

// 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 char *

strncpy( char *s1, const char *s2, size_t n ) \

    CYGBLD_ATTRIB_WEAK_ALIAS(__strncpy);

// FUNCTIONS

char *

__strncpy( char *s1, const char *s2, size_t n)

{

    CYG_REPORT_FUNCNAMETYPE( "__strncpy", "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 defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__)

    char *dscan;

    const char *sscan;

    dscan = s1;

    sscan = s2;

    while (n > 0)

    {

        --n;

        if ((*dscan++ = *sscan++) == '\0')

            break;

    }

    while (n-- > 0)

        *dscan++ = '\0';

    CYG_REPORT_RETVAL( s1 );

    return s1;

#else

    char *dst = s1;

    const char *src = s2;

    CYG_WORD *aligned_dst;

    const CYG_WORD *aligned_src;

    // If SRC and DEST is aligned and count large enough, then copy words.

    if (!CYG_LIBC_STR_UNALIGNED2 (src, dst) &&

        !CYG_LIBC_STR_OPT_TOO_SMALL (n)) {

        aligned_dst = (CYG_WORD *)dst;

        aligned_src = (CYG_WORD *)src;

        // SRC and DEST are both "CYG_WORD" aligned, try to do "CYG_WORD"

        // sized copies.

        while (n >= sizeof (CYG_WORD) &&

               !CYG_LIBC_STR_DETECTNULL(*aligned_src)) {

            n -= sizeof (CYG_WORD);

            *aligned_dst++ = *aligned_src++;

        }

        dst = (char *)aligned_dst;

        src = (const char *)aligned_src;

    } // if

    while (n > 0)

    {

        --n;

        if ((*dst++ = *src++) == '\0')

            break;

    }

    while (n-- > 0)

        *dst++ = '\0';

    CYG_REPORT_RETVAL( s1 );

    return s1;

#endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) ||

       //     defined(__OPTIMIZE_SIZE__)

} // __strncpy()

// EOF strncpy.cxx