Add posix compliance test for sscanf.

b/307808954

Change-Id: I43619bfa46ba82b678eac499cf98565b455652bd

starboard/nplb/BUILD.gn

@@ -188,6 +188,7 @@ target(gtest_target_type, "nplb") {
     "posix_compliance/posix_string_compare_no_case_test.cc",
     "posix_compliance/posix_string_format_test.cc",
     "posix_compliance/posix_string_format_wide_test.cc",
+    "posix_compliance/posix_string_scan_test.cc",
     "posix_compliance/posix_thread_attr_test.cc",
     "posix_compliance/posix_thread_create_test.cc",
     "posix_compliance/posix_thread_detach_test.cc",

starboard/nplb/posix_compliance/posix_string_scan_test.cc

@@ -0,0 +1,95 @@
+// Copyright 2016 The Cobalt Authors. All Rights Reserved.
+//
+// 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.
+
+// Here we are not trying to do anything fancy, just to really sanity check that
+// this is hooked up to something.
+
+#include "starboard/common/string.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace starboard {
+namespace nplb {
+namespace {
+
+const char kIpGood[] = "192.168.1.2";
+const char kIpBad1[] = "192.1x8.1.2";
+const char kIpBad2[] = "192.1x8";
+const char kIpBad3[] = "x.1.2.3";
+const char kIpBad4[] = "192.168.1.2.";
+const char kIpFormat[] = "%u.%u.%u.%u";
+
+const char kFloatString[] = "3.14159";
+const char kFloatPattern[] = "%f";
+const char kDoublePattern[] = "%lf";
+const float kExpectedFloat = 3.14159f;
+const double kExpectedDouble = 3.14159;
+
+TEST(PosixStringScanTest, SunnyDayIp1) {
+  unsigned int in[4] = {0};
+  EXPECT_EQ(4, sscanf(kIpGood, kIpFormat, in, in + 1, in + 2, in + 3));
+  EXPECT_EQ(192, in[0]);
+  EXPECT_EQ(168, in[1]);
+  EXPECT_EQ(1, in[2]);
+  EXPECT_EQ(2, in[3]);
+}
+
+TEST(PosixStringScanTest, SunnyDayIp2) {
+  unsigned int in[4] = {0};
+  EXPECT_EQ(4, sscanf(kIpBad4, kIpFormat, in, in + 1, in + 2, in + 3));
+  EXPECT_EQ(192, in[0]);
+  EXPECT_EQ(168, in[1]);
+  EXPECT_EQ(1, in[2]);
+  EXPECT_EQ(2, in[3]);
+}
+
+TEST(PosixStringScanTest, SunnyDayFloat) {
+  float f = 0.0f;
+  EXPECT_EQ(1, sscanf(kFloatString, kFloatPattern, &f));
+  EXPECT_EQ(kExpectedFloat, f);
+
+  double d = 0.0;
+  EXPECT_EQ(1, sscanf(kFloatString, kDoublePattern, &d));
+  EXPECT_EQ(kExpectedDouble, d);
+}
+
+TEST(PosixStringScanTest, RainyDayIp1) {
+  unsigned int in[4] = {0};
+  EXPECT_EQ(2, sscanf(kIpBad1, kIpFormat, in, in + 1, in + 2, in + 3));
+  EXPECT_EQ(192, in[0]);
+  EXPECT_EQ(1, in[1]);
+  EXPECT_EQ(0, in[2]);
+  EXPECT_EQ(0, in[3]);
+}
+
+TEST(PosixStringScanTest, RainyDayIp2) {
+  unsigned int in[4] = {0};
+  EXPECT_EQ(2, sscanf(kIpBad2, kIpFormat, in, in + 1, in + 2, in + 3));
+  EXPECT_EQ(192, in[0]);
+  EXPECT_EQ(1, in[1]);
+  EXPECT_EQ(0, in[2]);
+  EXPECT_EQ(0, in[3]);
+}
+
+TEST(PosixStringScanTest, RainyDayIp3) {
+  unsigned int in[4] = {0};
+  EXPECT_EQ(0, sscanf(kIpBad3, kIpFormat, in, in + 1, in + 2, in + 3));
+  EXPECT_EQ(0, in[0]);
+  EXPECT_EQ(0, in[1]);
+  EXPECT_EQ(0, in[2]);
+  EXPECT_EQ(0, in[3]);
+}
+
+}  // namespace
+}  // namespace nplb
+}  // namespace starboard