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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 memcpy_s() - bounds-checking memcpy().
  28. *
  29. ****************************************************************************/
  30.  
  31.  
  32. #include "variety.h"
  33. #include "saferlib.h"
  34. #include "widechar.h"
  35. #include <string.h>
  36. #include  <wchar.h>
  37. #include "xstring.h"
  38.  
  39. _WCRTLINK errno_t __F_NAME(memcpy_s,wmemcpy_s)( VOID_WC_TYPE * __restrict s1,
  40.                                                 rsize_t s1max,
  41.                                           const VOID_WC_TYPE * __restrict s2,
  42.                                                 rsize_t n )
  43. /*****************************************************************************/
  44. {
  45.     errno_t     rc = -1;
  46.     const char  *msg;
  47.  
  48.     // Verify runtime-constraints
  49.     // s1 not NULL
  50.     // s2 not NULL
  51.     // s1max <= RSIZE_MAX
  52.     // n     <= RSIZE_MAX
  53.     // n     <= s1max
  54.     // s1 and s2 no overlap
  55.     if( __check_constraint_nullptr_msg( msg, s1 ) &&
  56.         __check_constraint_nullptr_msg( msg, s2 ) &&
  57.         __check_constraint_maxsize_msg( msg, s1max ) &&
  58.         __check_constraint_maxsize_msg( msg, n ) &&
  59.         __check_constraint_a_gt_b_msg( msg, n, s1max ) &&
  60.         __check_constraint_overlap_msg( msg, s1, s1max, s2, n ) ) {
  61.  
  62.         // now it's safe to use memcpy
  63.          __F_NAME(memcpy,wmemcpy)( s1, s2, n );
  64.          rc = 0;
  65.     } else {
  66.         // Runtime-constraints violated, zero out destination array
  67.         if( (s1 != NULL) && __lte_rsizmax( s1max ) ) {
  68.             __F_NAME(memset,wmemset)( s1, 0, s1max );
  69.         }
  70.         // Now call the handler
  71.         __rtct_fail( __func__, msg, NULL );
  72.     }
  73.  
  74.     return( rc );
  75. }
  76.