Add ParseInt (and ParseUint).

strtol and family are hard to use correctly, and most callers don't
even try.

Change-Id: I2833622a92cccd4662c0c5bdbbef5eeb4e496914
diff --git a/base/parseint_test.cpp b/base/parseint_test.cpp
new file mode 100644
index 0000000..6a109f4
--- /dev/null
+++ b/base/parseint_test.cpp
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "base/parseint.h"
+
+#include <gtest/gtest.h>
+
+TEST(parseint, signed_smoke) {
+  int i;
+  ASSERT_EQ(false, android::base::ParseInt("x", &i));
+  ASSERT_EQ(false, android::base::ParseInt("123x", &i));
+
+  ASSERT_EQ(true, android::base::ParseInt("123", &i));
+  ASSERT_EQ(123, i);
+  ASSERT_EQ(true, android::base::ParseInt("-123", &i));
+  ASSERT_EQ(-123, i);
+
+  short s;
+  ASSERT_EQ(true, android::base::ParseInt("1234", &s));
+  ASSERT_EQ(1234, s);
+
+  ASSERT_EQ(true, android::base::ParseInt("12", &i, 0, 15));
+  ASSERT_EQ(12, i);
+  ASSERT_EQ(false, android::base::ParseInt("-12", &i, 0, 15));
+  ASSERT_EQ(false, android::base::ParseInt("16", &i, 0, 15));
+}
+
+TEST(parseint, unsigned_smoke) {
+  unsigned int i;
+  ASSERT_EQ(false, android::base::ParseUint("x", &i));
+  ASSERT_EQ(false, android::base::ParseUint("123x", &i));
+
+  ASSERT_EQ(true, android::base::ParseUint("123", &i));
+  ASSERT_EQ(123u, i);
+  ASSERT_EQ(false, android::base::ParseUint("-123", &i));
+
+  unsigned short s;
+  ASSERT_EQ(true, android::base::ParseUint("1234", &s));
+  ASSERT_EQ(1234u, s);
+
+  ASSERT_EQ(true, android::base::ParseUint("12", &i, 15u));
+  ASSERT_EQ(12u, i);
+  ASSERT_EQ(false, android::base::ParseUint("-12", &i, 15u));
+  ASSERT_EQ(false, android::base::ParseUint("16", &i, 15u));
+}
+
+TEST(parseint, no_implicit_octal) {
+  int i;
+  ASSERT_EQ(true, android::base::ParseInt("0123", &i));
+  ASSERT_EQ(123, i);
+
+  unsigned int u;
+  ASSERT_EQ(true, android::base::ParseUint("0123", &u));
+  ASSERT_EQ(123u, u);
+}