void *internal_memmove(void *dest, const void *src, uptr n) {
char *d = (char*)dest;
char *s = (char*)src;
- uptr i;
+ sptr i = (sptr)n;
+ CHECK_GE(i, 0);
if (d < s) {
for (i = 0; i < n; ++i)
d[i] = s[i];
} else {
if (d > s && n > 0)
- for (i = n - 1; i > 0 ; --i) {
+ for (i = n - 1; i >= 0 ; --i) {
d[i] = s[i];
}
}
--- /dev/null
+//===-- sanitizer_libc_test.cc --------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// Tests for sanitizer_libc.h.
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_common/sanitizer_libc.h"
+#include "gtest/gtest.h"
+
+// A regression test for internal_memmove() implementation.
+TEST(SanitizerCommon, InternalMemmoveRegression) {
+ char src[] = "Hello World";
+ char *dest = src + 6;
+ __sanitizer::internal_memmove(dest, src, 5);
+ EXPECT_EQ(dest[0], src[0]);
+ EXPECT_EQ(dest[4], src[4]);
+}