47 lines · cpp
1//===-- Unittests for strnlen ---------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/string/strnlen.h"10#include "test/UnitTest/Test.h"11#include <stddef.h>12 13TEST(LlvmLibcStrNLenTest, EmptyString) {14 const char *empty = "";15 ASSERT_EQ(static_cast<size_t>(0), LIBC_NAMESPACE::strnlen(empty, 0));16 // If N is greater than string length, this should still return 0.17 ASSERT_EQ(static_cast<size_t>(0), LIBC_NAMESPACE::strnlen(empty, 1));18}19 20TEST(LlvmLibcStrNLenTest, OneCharacterString) {21 const char *single = "X";22 ASSERT_EQ(static_cast<size_t>(1), LIBC_NAMESPACE::strnlen(single, 1));23 // If N is zero, this should return 0.24 ASSERT_EQ(static_cast<size_t>(0), LIBC_NAMESPACE::strnlen(single, 0));25 // If N is greater than string length, this should still return 1.26 ASSERT_EQ(static_cast<size_t>(1), LIBC_NAMESPACE::strnlen(single, 2));27}28 29TEST(LlvmLibcStrNLenTest, ManyCharacterString) {30 const char *many = "123456789";31 ASSERT_EQ(static_cast<size_t>(9), LIBC_NAMESPACE::strnlen(many, 9));32 // If N is smaller than the string length, it should return N.33 ASSERT_EQ(static_cast<size_t>(3), LIBC_NAMESPACE::strnlen(many, 3));34 // If N is zero, this should return 0.35 ASSERT_EQ(static_cast<size_t>(0), LIBC_NAMESPACE::strnlen(many, 0));36 // If N is greater than the string length, this should still return 9.37 ASSERT_EQ(static_cast<size_t>(9), LIBC_NAMESPACE::strnlen(many, 42));38}39 40TEST(LlvmLibcStrNLenTest, CharactersAfterNullTerminatorShouldNotBeIncluded) {41 const char str[5] = {'a', 'b', 'c', '\0', 'd'};42 ASSERT_EQ(static_cast<size_t>(3), LIBC_NAMESPACE::strnlen(str, 3));43 // This should only read up to the null terminator.44 ASSERT_EQ(static_cast<size_t>(3), LIBC_NAMESPACE::strnlen(str, 4));45 ASSERT_EQ(static_cast<size_t>(3), LIBC_NAMESPACE::strnlen(str, 5));46}47