1 files changed, 90 insertions, 0 deletions
diff --git a/xpcom/tests/gtest/TestCRT.cpp b/xpcom/tests/gtest/TestCRT.cpp
new file mode 100644
index 0000000000..22e161fcdd
--- /dev/null
+++ b/xpcom/tests/gtest/TestCRT.cpp
@@ -0,0 +1,90 @@
+/* -*- 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 "nsCRT.h"
+#include "nsString.h"
+#include "plstr.h"
+#include <stdlib.h>
+#include "gtest/gtest.h"
+
+namespace TestCRT {
+
+// The return from strcmp etc is only defined to be postive, zero or
+// negative. The magnitude of a non-zero return is irrelevant.
+static int sign(int val) {
+  if (val == 0) {
+    return 0;
+  } else {
+    if (val > 0) {
+      return 1;
+    } else {
+      return -1;
+    }
+  }
+}
+
+// Verify that nsCRT versions of string comparison routines get the
+// same answers as the native non-unicode versions. We only pass in
+// iso-latin-1 strings, so the comparison must be valid.
+static void Check(const char* s1, const char* s2, size_t n) {
+  bool longerThanN = strlen(s1) > n || strlen(s2) > n;
+
+  int clib = PL_strcmp(s1, s2);
+  int clib_n = PL_strncmp(s1, s2, n);
+
+  if (!longerThanN) {
+    EXPECT_EQ(sign(clib), sign(clib_n));
+  }
+
+  nsAutoString t1, t2;
+  CopyASCIItoUTF16(mozilla::MakeStringSpan(s1), t1);
+  CopyASCIItoUTF16(mozilla::MakeStringSpan(s2), t2);
+  const char16_t* us1 = t1.get();
+  const char16_t* us2 = t2.get();
+
+  int u2, u2_n;
+  u2 = nsCRT::strcmp(us1, us2);
+
+  EXPECT_EQ(sign(clib), sign(u2));
+
+  u2 = NS_strcmp(us1, us2);
+  u2_n = NS_strncmp(us1, us2, n);
+
+  EXPECT_EQ(sign(clib), sign(u2));
+  EXPECT_EQ(sign(clib_n), sign(u2_n));
+}
+
+struct Test {
+  const char* s1;
+  const char* s2;
+  size_t n;
+};
+
+static Test tests[] = {
+    {"foo", "foo", 3},       {"foo", "fo", 3},
+
+    {"foo", "bar", 3},       {"foo", "ba", 3},
+
+    {"foo", "zap", 3},       {"foo", "za", 3},
+
+    {"bar", "foo", 3},       {"bar", "fo", 3},
+
+    {"bar", "foo", 3},       {"bar", "fo", 3},
+
+    {"foo", "foobar", 3},    {"foobar", "foo", 3},
+    {"foobar", "foozap", 3}, {"foozap", "foobar", 3},
+};
+#define NUM_TESTS int((sizeof(tests) / sizeof(tests[0])))
+
+TEST(CRT, main)
+{
+  TestCRT::Test* tp = tests;
+  for (int i = 0; i < NUM_TESTS; i++, tp++) {
+    Check(tp->s1, tp->s2, tp->n);
+  }
+}
+
+}  // namespace TestCRT