MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma/OnigurumaIntrinsics.c

   1 /** @file
   2
   3   Provide intrinsics within Oniguruma
   4
   5   (C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR>
   6
   7   SPDX-License-Identifier: BSD-2-Clause-Patent
   8 **/
   9
  10 #include <Library/BaseMemoryLib.h>
  11
  12 //
  13 // From CryptoPkg/IntrinsicLib
  14 //
  15
  16 /* Copies bytes between buffers */
  17 #pragma function(memcpy)
  18 void * memcpy (void *dest, const void *src, unsigned int count)
  19 {
  20   return CopyMem (dest, src, (UINTN)count);
  21 }
  22
  23 /* Sets buffers to a specified character */
  24 #pragma function(memset)
  25 void * memset (void *dest, char ch, unsigned int count)
  26 {
  27   //
  28   // NOTE: Here we use one base implementation for memset, instead of the direct
  29   //       optimized SetMem() wrapper. Because the IntrinsicLib has to be built
  30   //       without whole program optimization option, and there will be some
  31   //       potential register usage errors when calling other optimized codes.
  32   //
  33
  34   //
  35   // Declare the local variables that actually move the data elements as
  36   // volatile to prevent the optimizer from replacing this function with
  37   // the intrinsic memset()
  38   //
  39   volatile UINT8  *Pointer;
  40
  41   Pointer = (UINT8 *)dest;
  42   while (count-- != 0) {
  43     *(Pointer++) = ch;
  44   }
  45
  46   return dest;
  47 }