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//===-- Unittests for wcscat ---------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "hdr/types/wchar_t.h"
#include "src/wchar/wcsncat.h"
#include "test/UnitTest/Test.h"
TEST(LlvmLibcWCSNCatTest, EmptyDest) {
wchar_t dest[4] = {L'\0'};
const wchar_t *src = L"abc";
// Start by copying nothing
LIBC_NAMESPACE::wcsncat(dest, src, 0);
ASSERT_TRUE(dest[0] == L'\0');
// Copying part of it.
LIBC_NAMESPACE::wcsncat(dest, src, 1);
ASSERT_TRUE(dest[0] == L'a');
ASSERT_TRUE(dest[1] == L'\0');
// Resetting for the last test.
dest[0] = '\0';
// Copying all of it.
LIBC_NAMESPACE::wcsncat(dest, src, 3);
ASSERT_TRUE(dest[0] == L'a');
ASSERT_TRUE(dest[1] == L'b');
ASSERT_TRUE(dest[2] == L'c');
ASSERT_TRUE(dest[3] == L'\0');
}
TEST(LlvmLibcWCSNCatTest, NonEmptyDest) {
wchar_t dest[7] = {L'x', L'y', L'z', L'\0'};
const wchar_t *src = L"abc";
// Adding on only part of the string
LIBC_NAMESPACE::wcsncat(dest, src, 1);
ASSERT_TRUE(dest[0] == L'x');
ASSERT_TRUE(dest[1] == L'y');
ASSERT_TRUE(dest[2] == L'z');
ASSERT_TRUE(dest[3] == L'a');
ASSERT_TRUE(dest[4] == L'\0');
// Copying more without resetting
LIBC_NAMESPACE::wcsncat(dest, src, 2);
ASSERT_TRUE(dest[0] == L'x');
ASSERT_TRUE(dest[1] == L'y');
ASSERT_TRUE(dest[2] == L'z');
ASSERT_TRUE(dest[3] == L'a');
ASSERT_TRUE(dest[4] == L'a');
ASSERT_TRUE(dest[5] == L'b');
ASSERT_TRUE(dest[6] == L'\0');
// Setting end marker to make sure it overwrites properly.
dest[3] = L'\0';
// Copying all of it.
LIBC_NAMESPACE::wcsncat(dest, src, 3);
ASSERT_TRUE(dest[0] == L'x');
ASSERT_TRUE(dest[1] == L'y');
ASSERT_TRUE(dest[2] == L'z');
ASSERT_TRUE(dest[3] == L'a');
ASSERT_TRUE(dest[4] == L'b');
ASSERT_TRUE(dest[5] == L'c');
ASSERT_TRUE(dest[6] == L'\0');
// Check that copying still works when count > src length.
dest[0] = L'\0';
// And that it doesn't write beyond what is necessary.
dest[4] = L'Z';
LIBC_NAMESPACE::wcsncat(dest, src, 4);
ASSERT_TRUE(dest[0] == L'a');
ASSERT_TRUE(dest[1] == L'b');
ASSERT_TRUE(dest[2] == L'c');
ASSERT_TRUE(dest[3] == L'\0');
ASSERT_TRUE(dest[4] == L'Z');
}
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