MdeModulePkg/Universal/RegularExpressionDxe/OnigurumaIntrinsics.c

   1 /** @file
   2
   3   Provide intrinsics within Oniguruma
   4
   5   (C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR>
   6   Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
   7
   8   SPDX-License-Identifier: BSD-2-Clause-Patent
   9 **/
  10
  11 #include <Library/BaseMemoryLib.h>
  12
  13 //
  14 // From CryptoPkg/IntrinsicLib
  15 //
  16
  17 /* Copies bytes between buffers */
  18 #pragma function(memcpy)
  19 void * memcpy (void *dest, const void *src, unsigned int count)
  20 {
  21   return CopyMem (dest, src, (UINTN)count);
  22 }
  23
  24 /* Sets buffers to a specified character */
  25 #pragma function(memset)
  26 void * memset (void *dest, char ch, unsigned int count)
  27 {
  28   //
  29   // NOTE: Here we use one base implementation for memset, instead of the direct
  30   //       optimized SetMem() wrapper. Because the IntrinsicLib has to be built
  31   //       without whole program optimization option, and there will be some
  32   //       potential register usage errors when calling other optimized codes.
  33   //
  34
  35   //
  36   // Declare the local variables that actually move the data elements as
  37   // volatile to prevent the optimizer from replacing this function with
  38   // the intrinsic memset()
  39   //
  40   volatile UINT8  *Pointer;
  41
  42   Pointer = (UINT8 *)dest;
  43   while (count-- != 0) {
  44     *(Pointer++) = ch;
  45   }
  46
  47   return dest;
  48 }