MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma/OnigurumaIntrinsics.c

   1 /** @file
   2
   3   Provide intrinsics within Oniguruma
   4
   5   Copyright (c) 2015, Hewlett-Packard Development Company, L.P.<BR>
   6
   7   This program and the accompanying materials are licensed and made available
   8   under the terms and conditions of the BSD License that accompanies this
   9   distribution.  The full text of the license may be found at
  10   http://opensource.org/licenses/bsd-license.php.
  11
  12   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
  13   WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 **/
  15
  16 #include <Library/BaseMemoryLib.h>
  17
  18 //
  19 // From CryptoPkg/IntrinsicLib
  20 //
  21
  22 /* Copies bytes between buffers */
  23 #pragma function(memcpy)
  24 void * memcpy (void *dest, const void *src, unsigned int count)
  25 {
  26   return CopyMem (dest, src, (UINTN)count);
  27 }
  28
  29 /* Sets buffers to a specified character */
  30 #pragma function(memset)
  31 void * memset (void *dest, char ch, unsigned int count)
  32 {
  33   //
  34   // NOTE: Here we use one base implementation for memset, instead of the direct
  35   //       optimized SetMem() wrapper. Because the IntrinsicLib has to be built
  36   //       without whole program optimization option, and there will be some
  37   //       potential register usage errors when calling other optimized codes.
  38   //
  39
  40   //
  41   // Declare the local variables that actually move the data elements as
  42   // volatile to prevent the optimizer from replacing this function with
  43   // the intrinsic memset()
  44   //
  45   volatile UINT8  *Pointer;
  46
  47   Pointer = (UINT8 *)dest;
  48   while (count-- != 0) {
  49     *(Pointer++) = ch;
  50   }
  51
  52   return dest;
  53 }