Add few docs and implementation of strcpy and strcat.

Summary:
This patch illustrates some of the features like modularity we want
in the new libc. Few other ideas like different kinds of testing, redirectors
etc are not yet present.

Reviewers: dlj, hfinkel, theraven, jfb, alexshap, jdoerfert

Subscribers: mgorny, dexonsmith, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67867

llvm-svn: 373764

1 files changed, 19 insertions, 0 deletions

diff --git a/libc/src/string/strcpy/strcpy.cpp b/libc/src/string/strcpy/strcpy.cpp
new file mode 100644
index 00000000000..0dfb1e35e41
--- /dev/null
+++ b/libc/src/string/strcpy/strcpy.cpp
@@ -0,0 +1,19 @@
+//===-------------------- Implementation of strcpy -----------------------===//
+//
+// 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/strcpy/strcpy.h"
+
+#include "src/__support/common.h"
+
+namespace __llvm_libc {
+
+char *LLVM_LIBC_ENTRYPOINT(strcpy)(char *dest, const char *src) {
+  return reinterpret_cast<char *>(::memcpy(dest, src, ::strlen(src) + 1));
+}
+
+} // namespace __llvm_libc