| 1 | //===-- Unittests for strnlen ---------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/string/strnlen.h" |
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| 10 | #include "test/UnitTest/Test.h" |
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| 11 | #include <stddef.h> |
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| 12 | |
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| 13 | TEST(LlvmLibcStrNLenTest, EmptyString) { |
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| 14 | const char *empty = "" ; |
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| 15 | ASSERT_EQ(static_cast<size_t>(0), LIBC_NAMESPACE::strnlen(empty, 0)); |
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| 16 | // If N is greater than string length, this should still return 0. |
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| 17 | ASSERT_EQ(static_cast<size_t>(0), LIBC_NAMESPACE::strnlen(empty, 1)); |
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| 18 | } |
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| 19 | |
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| 20 | TEST(LlvmLibcStrNLenTest, OneCharacterString) { |
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| 21 | const char *single = "X" ; |
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| 22 | ASSERT_EQ(static_cast<size_t>(1), LIBC_NAMESPACE::strnlen(single, 1)); |
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| 23 | // If N is zero, this should return 0. |
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| 24 | ASSERT_EQ(static_cast<size_t>(0), LIBC_NAMESPACE::strnlen(single, 0)); |
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| 25 | // If N is greater than string length, this should still return 1. |
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| 26 | ASSERT_EQ(static_cast<size_t>(1), LIBC_NAMESPACE::strnlen(single, 2)); |
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| 27 | } |
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| 28 | |
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| 29 | TEST(LlvmLibcStrNLenTest, ManyCharacterString) { |
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| 30 | const char *many = "123456789" ; |
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| 31 | ASSERT_EQ(static_cast<size_t>(9), LIBC_NAMESPACE::strnlen(many, 9)); |
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| 32 | // If N is smaller than the string length, it should return N. |
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| 33 | ASSERT_EQ(static_cast<size_t>(3), LIBC_NAMESPACE::strnlen(many, 3)); |
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| 34 | // If N is zero, this should return 0. |
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| 35 | ASSERT_EQ(static_cast<size_t>(0), LIBC_NAMESPACE::strnlen(many, 0)); |
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| 36 | // If N is greater than the string length, this should still return 9. |
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| 37 | ASSERT_EQ(static_cast<size_t>(9), LIBC_NAMESPACE::strnlen(many, 42)); |
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| 38 | } |
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| 39 | |
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| 40 | TEST(LlvmLibcStrNLenTest, CharactersAfterNullTerminatorShouldNotBeIncluded) { |
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| 41 | const char str[5] = {'a', 'b', 'c', '\0', 'd'}; |
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| 42 | ASSERT_EQ(static_cast<size_t>(3), LIBC_NAMESPACE::strnlen(str, 3)); |
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| 43 | // This should only read up to the null terminator. |
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| 44 | ASSERT_EQ(static_cast<size_t>(3), LIBC_NAMESPACE::strnlen(str, 4)); |
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| 45 | ASSERT_EQ(static_cast<size_t>(3), LIBC_NAMESPACE::strnlen(str, 5)); |
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| 46 | } |
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| 47 | |
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