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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:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
  28. *               DESCRIBE IT HERE!
  29. *
  30. ****************************************************************************/
  31.  
  32.  
  33. #include "variety.h"
  34. #include "widechar.h"
  35. #include <string.h>
  36. #include "riscstr.h"
  37.  
  38. #if defined(M_I86) & !defined(__WIDECHAR__)
  39.  
  40. extern char *fast_strncpy( char _WCFAR *, const char *, size_t );
  41.  
  42. #if defined(__SMALL_DATA__)
  43.  
  44. #pragma aux fast_strncpy = \
  45.         0x57            /* push di */\
  46.         0xac            /* L1: lodsb */\
  47.         0xaa            /* stosb */\
  48.         0x84 0xc0       /* test al,al */\
  49.         0xe0 0xfa       /* loopne L1 */\
  50.         0x31 0xc0       /* xor ax,ax */\
  51.         0xd1 0xe9       /* shr cx,1 */\
  52.         0xf3 0xab       /* rep stosw */\
  53.         0x11 0xc9       /* adc cx,cx */\
  54.         0xf3 0xaa       /* rep stosb */\
  55.         0x58            /* pop ax */\
  56.         parm caller     [es di] [si] [cx]\
  57.         value           [ax] \
  58.         modify exact    [ax cx si di];
  59.  
  60. #else
  61.  
  62. #pragma aux fast_strncpy = \
  63.         0x1e            /* push ds */ \
  64.         0x8e 0xda       /* mov ds,dx */ \
  65.         0x57            /* push di */\
  66.         0xac            /* L1: lodsb */\
  67.         0xaa            /* stosb */\
  68.         0x84 0xc0       /* test al,al */\
  69.         0xe0 0xfa       /* loopne L1 */\
  70.         0x31 0xc0       /* xor ax,ax */\
  71.         0xd1 0xe9       /* shr cx,1 */\
  72.         0xf3 0xab       /* rep stosw */\
  73.         0x11 0xc9       /* adc cx,cx */\
  74.         0xf3 0xaa       /* rep stosb */\
  75.         0x58            /* pop ax */\
  76.         0x1f            /* pop ds */ \
  77.         parm caller     [es di] [dx si] [cx]\
  78.         value           [es ax] \
  79.         modify exact    [ax cx si di];
  80.  
  81. #endif
  82.  
  83. #endif
  84.  
  85.  
  86. #if defined(__RISCSTR__) && defined(__WIDECHAR__)
  87.  _WCRTLINK CHAR_TYPE *__simple_wcsncpy( CHAR_TYPE *dst, const CHAR_TYPE *src, size_t len )
  88. #else
  89.  _WCRTLINK CHAR_TYPE *__F_NAME(strncpy,wcsncpy)( CHAR_TYPE *dst, const CHAR_TYPE *src, size_t len )
  90. #endif
  91.     {
  92. #if defined(M_I86) && !defined(__WIDECHAR__)
  93.         if( len ) {
  94.             return( fast_strncpy( dst, src, len ) );
  95.         }
  96.         return( dst );
  97. #else
  98.         CHAR_TYPE *ret;
  99.  
  100.         ret = dst;
  101.         for(;len; --len ) {
  102.             if( *src == NULLCHAR ) break;
  103.             *dst++ = *src++;
  104.         }
  105.         while( len != 0 ) {
  106.             *dst++ = NULLCHAR;      /* pad destination string with null chars */
  107.             --len;
  108.         }
  109.         return( ret );
  110. #endif
  111.     }
  112.