string: add snprintf

Signed-off-by: Simon Rozman <simon@rozman.si>

UnitTests/main.cpp

@@ -28,6 +28,7 @@ int main(int, const char *[])
 		UnitTests::stream::replicator();
 		UnitTests::string::strncpy();
 		UnitTests::string::sprintf();
+		UnitTests::string::snprintf();
 		UnitTests::unicode::charset_encoder();
 		UnitTests::unicode::normalize();
 		UnitTests::unicode::str2wstr();

UnitTests/pch.hpp

@@ -109,6 +109,7 @@ namespace UnitTests
 	public:
 		TEST_METHOD(strncpy);
 		TEST_METHOD(sprintf);
+		TEST_METHOD(snprintf);
 	};
 
 	TEST_CLASS(unicode)

UnitTests/string.cpp

@@ -42,4 +42,31 @@ namespace UnitTests
 		Assert::AreEqual(str.c_str(), stdex::sprintf("%s", locale, str.data()).c_str());
 		Assert::AreEqual(str.size(), stdex::sprintf("%s", locale, str.data()).size());
 	}
+
+	void string::snprintf()
+	{
+		stdex::locale locale(stdex::create_locale(LC_ALL, "en_US.UTF-8"));
+
+		{
+			wchar_t buf[0x100];
+			Assert::IsTrue(stdex::snprintf(buf, _countof(buf), L"This is %ls.", locale, L"a test") == 15);
+			Assert::AreEqual(L"This is a test.", buf);
+		}
+		{
+			char buf[0x100];
+			Assert::IsTrue(stdex::snprintf(buf, _countof(buf), "This is %s.", locale, "a test") == 15);
+			Assert::AreEqual("This is a test.", buf);
+		}
+
+		{
+			wchar_t buf[8];
+			Assert::IsTrue(stdex::snprintf(buf, _countof(buf), L"This is %ls.", locale, L"a test") == 8);
+			Assert::IsTrue(stdex::strncmp(L"This is a test.", buf, _countof(buf)) == 0);
+		}
+		{
+			char buf[8];
+			Assert::IsTrue(stdex::snprintf(buf, _countof(buf), "This is %s.", locale, "a test") == 8);
+			Assert::IsTrue(stdex::strncmp("This is a test.", buf, _countof(buf)) == 0);
+		}
+	}
 }