[asan] Add asprintf negative test.

llvm-svn: 216542

compiler-rt/test/asan/TestCases/Posix/asprintf.cc

@@ -0,0 +1,20 @@
+// RUN: %clangxx_asan -O0 %s -o %t && %run %t 2>&1 | FileCheck %s
+// RUN: %clangxx_asan -O3 %s -o %t && %run %t 2>&1 | FileCheck %s
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv) {
+  char *p;
+  int res = asprintf(&p, "%d", argc);
+  fprintf(stderr, "x%d %sx\n", res, p);
+  // CHECK: x1 1x
+  free(p);
+  fprintf(stderr, "DONE\n");
+  // CHECK: DONE
+  return 0;
+}