third_party/grpc/src/core/lib/gpr/wrap_memcpy.cc

/*
 *
 * Copyright 2016 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#include <grpc/support/port_platform.h>

#include <string.h>

/* Provide a wrapped memcpy for targets that need to be backwards
 * compatible with older libc's.
 *
 * Enable by setting LDFLAGS=-Wl,-wrap,memcpy when linking.
 */

extern "C" {
#ifdef __linux__
#if defined(__x86_64__) && !defined(GPR_MUSL_LIBC_COMPAT)
__asm__(".symver memcpy,memcpy@GLIBC_2.2.5");
void* __wrap_memcpy(void* destination, const void* source, size_t num) {
  return memcpy(destination, source, num);
}
#else /* !__x86_64__ */
void* __wrap_memcpy(void* destination, const void* source, size_t num) {
  return memmove(destination, source, num);
}
#endif
#endif
}