[sanitizer] Add strnlen to the common interceptors

Summary:
Adds strnlen to the common interceptors, under the existing flag
intercept_strlen.

Removes the now-duplicate strnlen interceptor from asan and msan.
This adds strnlen to tsan, which previously did not intercept it.

Adds a new test of strnlen to the sanitizer_common test cases.

Reviewers: samsonov

Subscribers: zhaoqin, llvm-commits, kcc

Differential Revision: http://reviews.llvm.org/D18397

llvm-svn: 264195

1 files changed, 12 insertions, 0 deletions

diff --git a/compiler-rt/test/sanitizer_common/TestCases/strnlen.c b/compiler-rt/test/sanitizer_common/TestCases/strnlen.c
new file mode 100644
index 00000000000..8ab8ec91151
--- /dev/null
+++ b/compiler-rt/test/sanitizer_common/TestCases/strnlen.c
@@ -0,0 +1,12 @@
+// RUN: %clang %s -o %t && %run %t 2>&1
+
+#include <assert.h>
+#include <string.h>
+int main(int argc, char **argv) {
+  const char *s = "mytest";
+  assert(strnlen(s, 0) == 0UL);
+  assert(strnlen(s, 1) == 1UL);
+  assert(strnlen(s, 6) == strlen(s));
+  assert(strnlen(s, 7) == strlen(s));
+  return 0;
+}