strcpy.cxx

eCos/RedBoot for勤研ARM AnywhereII(4510) 含全部源代码

//===========================================================================
//
//      strcpy.cxx
//
//      ANSI standard strcpy() routine
//
//===========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
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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
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// this file might be covered by the GNU General Public License.
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// at http://sources.redhat.com/ecos/ecos-license/
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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 char *
strcpy( char *s1, const char *s2 ) CYGBLD_ATTRIB_WEAK_ALIAS(__strcpy);

// FUNCTIONS

char *
__strcpy( char *s1, const char *s2 )
{
    CYG_REPORT_FUNCNAMETYPE( "__strcpy", "returning addr %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 defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__)
    char *s = s1;
    
    while ((*s1++ = *s2++) != '\0')
        ;

    CYG_REPORT_RETVAL( s );
    
    return s;
#else
    char *dst = s1;
    const char *src = s2;
    CYG_WORD *aligned_dst;
    const CYG_WORD *aligned_src;
    
    // If SRC or DEST is unaligned, then copy bytes.
    if (CYG_LIBC_STR_UNALIGNED2 (src, dst))
    {
        while ((*dst++ = *src++) != '\0')
            ;

        CYG_REPORT_RETVAL( s1 );
    
        return s1;
    }
    
    aligned_dst = (CYG_WORD *)dst;
    aligned_src = (const CYG_WORD *)src;
    
    // SRC and DEST are both "CYG_WORD" aligned, try to do "CYG_WORD"
    // sized copies.
    while (!CYG_LIBC_STR_DETECTNULL(*aligned_src))
    {
        *aligned_dst++ = *aligned_src++;
    }
    
    dst = (char*)aligned_dst;
    src = (char*)aligned_src;
    
    while ((*dst++ = *src++) != '\0')
           ;

    CYG_REPORT_RETVAL( s1 );
    
    return s1;
#endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) ||
       //     defined(__OPTIMIZE_SIZE__)
} // __strcpy()

// EOF strcpy.cxx