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

//

//      strstr.cxx

//

//      ANSI standard strstr() 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 *

strstr( const char *s1, const char *s2 ) CYGBLD_ATTRIB_WEAK_ALIAS(__strstr);

// FUNCTIONS

char *

__strstr( const char *s1, const char *s2 )

{

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

    CYG_REPORT_FUNCARG2( "s1=%08x, s2=%08x", s1, s2 );

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

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

    if (*s1 == '\0')

    {

        if (*s2)

        {

            CYG_REPORT_RETVAL( NULL );

            return (char *) NULL;

        } // if

        else

        {

            CYG_REPORT_RETVAL( s1 );

            return (char *) s1;

        } // else

    } // if

    while (*s1)

    {

        cyg_ucount32 i;

        for (i=0 ; ; i++)

        {

            if (s2[i] == '\0')

            {

                CYG_REPORT_RETVAL( s1 );

                return (char *) s1;

            } // if

            if (s2[i] != s1[i])

            {

                break;

            } // if

        } // for

        s1++;

    } // while

    CYG_REPORT_RETVAL( NULL );

    return (char *) NULL;

} // __strstr()

// EOF strstr.cxx