[Sanitizer] Move internal_strncpy to sanitizer_libc (and make its behavior conforming to manual)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@157922 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/sanitizer_common/sanitizer_libc.cc b/lib/sanitizer_common/sanitizer_libc.cc
index c9474fbcd..6c07864fe 100644
--- a/lib/sanitizer_common/sanitizer_libc.cc
+++ b/lib/sanitizer_common/sanitizer_libc.cc
@@ -10,6 +10,7 @@
 // This file is shared between AddressSanitizer and ThreadSanitizer
 // run-time libraries. See sanitizer_libc.h for details.
 //===----------------------------------------------------------------------===//
+#include "sanitizer_defs.h"
 #include "sanitizer_libc.h"
 
 namespace __sanitizer {
@@ -17,4 +18,13 @@ namespace __sanitizer {
 void MiniLibcStub() {
 }
 
+char *internal_strncpy(char *dst, const char *src, uptr n) {
+  uptr i;
+  for (i = 0; i < n && src[i]; i++)
+    dst[i] = src[i];
+  for (; i < n; i++)
+    dst[i] = '\0';
+  return dst;
+}
+
 }  // namespace __sanitizer