1 files changed, 68 insertions, 0 deletions
diff --git a/test/Analysis/string.c b/test/Analysis/string.c
index d19439fde5..ac53ae472b 100644
--- a/test/Analysis/string.c
+++ b/test/Analysis/string.c
@@ -328,6 +328,74 @@ void strcpy_no_overflow(char *y) {
 }
 
 //===----------------------------------------------------------------------===
+// strncpy()
+//===----------------------------------------------------------------------===
+
+#ifdef VARIANT
+
+#define __strncpy_chk BUILTIN(__strncpy_chk)
+char *__strncpy_chk(char *restrict s1, const char *restrict s2, size_t n, size_t destlen);
+
+#define strncpy(a,b,c) __strncpy_chk(a,b,c, (size_t)-1)
+
+#else /* VARIANT */
+
+#define strncpy BUILTIN(strncpy)
+char *strncpy(char *restrict s1, const char *restrict s2, size_t n);
+
+#endif /* VARIANT */
+
+
+void strncpy_null_dst(char *x) {
+  strncpy(NULL, x, 1); // expected-warning{{Null pointer argument in call to byte string function}}
+}
+
+void strncpy_null_src(char *x) {
+  strncpy(x, NULL, 1); // expected-warning{{Null pointer argument in call to byte string function}}
+}
+
+void strncpy_fn(char *x) {
+  strncpy(x, (char*)&strncpy_fn, 1); // expected-warning{{Argument to byte string function is the address of the function 'strncpy_fn', which is not a null-terminated string}}
+}
+
+void strncpy_effects(char *x, char *y) {
+  char a = x[0];
+
+  if (strncpy(x, y, strlen(y)) != x)
+    (void)*(char*)0; // no-warning
+
+  if (strlen(x) != strlen(y))
+    (void)*(char*)0; // no-warning
+
+  if (a != x[0])
+    (void)*(char*)0; // expected-warning{{null}}
+}
+
+void strncpy_overflow(char *y) {
+  char x[4];
+  if (strlen(y) == 4)
+    strncpy(x, y, strlen(y)); // expected-warning{{Byte string function overflows destination buffer}}
+}
+
+void strncpy_len_overflow(char *y) {
+  char x[4];
+  if (strlen(y) == 3)
+    strncpy(x, y, sizeof(x)); // no-warning
+}
+
+void strncpy_no_overflow(char *y) {
+  char x[4];
+  if (strlen(y) == 3)
+    strncpy(x, y, strlen(y)); // no-warning
+}
+
+void strncpy_no_len_overflow(char *y) {
+  char x[4];
+  if (strlen(y) == 4)
+    strncpy(x, y, sizeof(x)-1); // no-warning
+}
+
+//===----------------------------------------------------------------------===
 // stpcpy()
 //===----------------------------------------------------------------------===