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  1. /****************************************************************************
  2. *
  3. *                            Open Watcom Project
  4. *
  5. *    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
  6. *
  7. *  ========================================================================
  8. *
  9. *    This file contains Original Code and/or Modifications of Original
  10. *    Code as defined in and that are subject to the Sybase Open Watcom
  11. *    Public License version 1.0 (the 'License'). You may not use this file
  12. *    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
  13. *    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
  14. *    provided with the Original Code and Modifications, and is also
  15. *    available at www.sybase.com/developer/opensource.
  16. *
  17. *    The Original Code and all software distributed under the License are
  18. *    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  19. *    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
  20. *    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
  21. *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
  22. *    NON-INFRINGEMENT. Please see the License for the specific language
  23. *    governing rights and limitations under the License.
  24. *
  25. *  ========================================================================
  26. *
  27. * Description:  Implementation of memset() and wmemset().
  28. *
  29. ****************************************************************************/
  30.  
  31.  
  32. #include "variety.h"
  33. #include "widechar.h"
  34. #include <string.h>
  35. #include <wchar.h>
  36. #include "xstring.h"
  37.  
  38.  
  39. #if defined(__386__)
  40. extern  void    __STOSB( void *, int, unsigned );
  41. #pragma aux     __STOSB "*" parm [eax] [edx] [ecx];
  42.  
  43. extern  void    *__set386( void *, int, unsigned );
  44. #pragma aux     __set386 =  \
  45.         "push   EAX"            /* save return value*/\
  46.         "mov    DH,DL"          /* duplicate byte value thru EDX */\
  47.         "shl    EDX,8"          /* ... */\
  48.         "mov    DL,DH"          /* ... */\
  49.         "shl    EDX,8"          /* ... */\
  50.         "mov    DL,DH"          /* ... */\
  51.         "call   __STOSB"        /* do store */\
  52.         "pop    EAX"            /* restore return value*/\
  53.         parm [eax] [edx] [ecx] \
  54.         value [eax];
  55. #endif
  56.  
  57. _WCRTLINK VOID_WC_TYPE *__F_NAME(memset,wmemset)( VOID_WC_TYPE *dst, INT_WC_TYPE c, size_t len )
  58. {
  59. #if defined(__INLINE_FUNCTIONS__) && !defined(__WIDECHAR__) && defined(_M_IX86)
  60.     #if defined(__386__)
  61.         return( __set386( dst, c, len ) );
  62.     #else
  63.         return( _inline_memset( dst, c, len ) );
  64.     #endif
  65. #else
  66.     CHAR_TYPE   *p;
  67.  
  68.     for( p = dst; len; --len ) {
  69.         *p++ = c;
  70.     }
  71.     return( dst );
  72. #endif
  73. }
  74.