1 files changed, 69 insertions, 0 deletions
diff --git a/js/src/jsapi-tests/testPrintf.cpp b/js/src/jsapi-tests/testPrintf.cpp
new file mode 100644
index 0000000000..332d0d85cd
--- /dev/null
+++ b/js/src/jsapi-tests/testPrintf.cpp
@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/IntegerPrintfMacros.h"
+
+#include <cfloat>
+#include <stdarg.h>
+
+#include "js/Printf.h"
+
+#include "jsapi-tests/tests.h"
+
+static bool MOZ_FORMAT_PRINTF(2, 3)
+    print_one(const char* expect, const char* fmt, ...) {
+  va_list ap;
+
+  va_start(ap, fmt);
+  JS::UniqueChars output = JS_vsmprintf(fmt, ap);
+  va_end(ap);
+
+  return output && !strcmp(output.get(), expect);
+}
+
+static const char* zero() {
+  // gcc 9 is altogether too clever about detecting that this will always
+  // return nullptr. Do not replace 0x10 with 0x1; it will no longer work.
+  return uintptr_t(&zero) == 0x10 ? "never happens" : nullptr;
+}
+
+BEGIN_TEST(testPrintf) {
+  CHECK(print_one("23", "%d", 23));
+  CHECK(print_one("-1", "%d", -1));
+  CHECK(print_one("23", "%u", 23u));
+  CHECK(print_one("0x17", "0x%x", 23u));
+  CHECK(print_one("0xFF", "0x%X", 255u));
+  CHECK(print_one("027", "0%o", 23u));
+  CHECK(print_one("-1", "%hd", (short)-1));
+  // This could be expanded if need be, it's just convenient to do
+  // it this way.
+  if (sizeof(short) == 2) {
+    CHECK(print_one("8000", "%hx", (unsigned short)0x8000));
+  }
+  CHECK(print_one("0xf0f0", "0x%lx", 0xf0f0ul));
+  CHECK(print_one("0xF0F0", "0x%llX", 0xf0f0ull));
+  CHECK(print_one("27270", "%zu", (size_t)27270));
+  CHECK(print_one("27270", "%zu", (size_t)27270));
+  CHECK(print_one("hello", "he%so", "ll"));
+  CHECK(print_one("(null)", "%s", ::zero()));
+  CHECK(print_one("0", "%p", (char*)0));
+  CHECK(print_one("h", "%c", 'h'));
+  CHECK(print_one("1.500000", "%f", 1.5f));
+  CHECK(print_one("1.5", "%g", 1.5));
+
+  // Regression test for bug#1350097.  The bug was an assertion
+  // failure caused by printing a very long floating point value.
+  print_one("ignore", "%lf", DBL_MAX);
+
+  CHECK(print_one("2727", "%" PRIu32, (uint32_t)2727));
+  CHECK(print_one("aa7", "%" PRIx32, (uint32_t)2727));
+  CHECK(print_one("2727", "%" PRIu64, (uint64_t)2727));
+  CHECK(print_one("aa7", "%" PRIx64, (uint64_t)2727));
+
+  return true;
+}
+END_TEST(testPrintf)