[libc] Add memset and bzero implementations

Summary: This patch adds general purpose `memset` and `bzero` implementations.

Reviewers: sivachandra, abrachet

Subscribers: mgorny, tschuett, ecnelises, libc-commits, courbet

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D80010

1 files changed, 21 insertions, 0 deletions

diff --git a/libc/src/string/memset.cpp b/libc/src/string/memset.cpp
new file mode 100644
index 000000000000..cf1be5e42c6c
--- /dev/null
+++ b/libc/src/string/memset.cpp
@@ -0,0 +1,21 @@
+//===-- Implementation of memset ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/string/memset.h"
+#include "src/__support/common.h"
+#include "src/string/memory_utils/memset_utils.h"
+
+namespace __llvm_libc {
+
+void *LLVM_LIBC_ENTRYPOINT(memset)(void *dst, int value, size_t count) {
+  GeneralPurposeMemset(reinterpret_cast<char *>(dst),
+                       static_cast<unsigned char>(value), count);
+  return dst;
+}
+
+} // namespace __llvm_libc