1df0dbfcb5
Summary: Having a consistent prefix makes selecting all of the llvm libc tests easier on any platform that is also using the gtest framework. This also modifies the TEST and TEST_F macros to enforce this change moving forward. Reviewers: sivachandra Subscribers:
115 lines
4.3 KiB
C++
115 lines
4.3 KiB
C++
//===-- Unittests for memrchr ---------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/string/memrchr.h"
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#include "utils/UnitTest/Test.h"
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#include <stddef.h>
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// A helper function that calls memrchr and abstracts away the explicit cast for
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// readability purposes.
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const char *call_memrchr(const void *src, int c, size_t size) {
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return reinterpret_cast<const char *>(__llvm_libc::memrchr(src, c, size));
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}
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TEST(LlvmLibcMemRChrTest, FindsCharacterAfterNullTerminator) {
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// memrchr should continue searching after a null terminator.
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const size_t size = 6;
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const unsigned char src[size] = {'a', '\0', 'b', 'c', 'd', '\0'};
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// Should return 'b', 'c', 'd', '\0' even when after null terminator.
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ASSERT_STREQ(call_memrchr(src, 'b', size), "bcd");
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}
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TEST(LlvmLibcMemRChrTest, FindsCharacterInNonNullTerminatedCollection) {
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const size_t size = 3;
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const unsigned char src[size] = {'a', 'b', 'c'};
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// Should return 'b', 'c'.
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const char *ret = call_memrchr(src, 'b', size);
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ASSERT_EQ(ret[0], 'b');
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ASSERT_EQ(ret[1], 'c');
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}
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TEST(LlvmLibcMemRChrTest, FindsFirstCharacter) {
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const size_t size = 6;
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const unsigned char src[size] = {'a', 'b', 'c', 'd', 'e', '\0'};
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// Should return original array since 'a' is the first character.
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ASSERT_STREQ(call_memrchr(src, 'a', size), "abcde");
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}
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TEST(LlvmLibcMemRChrTest, FindsMiddleCharacter) {
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const size_t size = 6;
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const unsigned char src[size] = {'a', 'b', 'c', 'd', 'e', '\0'};
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// Should return characters after (and including) 'c'.
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ASSERT_STREQ(call_memrchr(src, 'c', size), "cde");
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}
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TEST(LlvmLibcMemRChrTest, FindsLastCharacterThatIsNotNullTerminator) {
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const size_t size = 6;
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const unsigned char src[size] = {'a', 'b', 'c', 'd', 'e', '\0'};
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// Should return 'e' and null-terminator.
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ASSERT_STREQ(call_memrchr(src, 'e', size), "e");
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}
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TEST(LlvmLibcMemRChrTest, FindsNullTerminator) {
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const size_t size = 6;
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const unsigned char src[size] = {'a', 'b', 'c', 'd', 'e', '\0'};
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// Should return null terminator.
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ASSERT_STREQ(call_memrchr(src, '\0', size), "");
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}
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TEST(LlvmLibcMemRChrTest, CharacterNotWithinStringShouldReturnNullptr) {
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const size_t size = 4;
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const unsigned char src[size] = {'1', '2', '3', '?'};
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// Since 'z' is not within 'characters', should return nullptr.
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ASSERT_STREQ(call_memrchr(src, 'z', size), nullptr);
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}
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TEST(LlvmLibcMemRChrTest, CharacterNotWithinSizeShouldReturnNullptr) {
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const unsigned char src[5] = {'1', '2', '3', '4', '\0'};
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// Since '4' is not within the first 2 characters, this should return nullptr.
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const size_t size = 2;
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ASSERT_STREQ(call_memrchr(src, '4', size), nullptr);
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}
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TEST(LlvmLibcMemRChrTest, ShouldFindLastOfDuplicates) {
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size_t size = 12; // 11 characters + null terminator.
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const char *dups = "abc1def1ghi";
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// 1 is duplicated in 'dups', but it should find the last copy.
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ASSERT_STREQ(call_memrchr(dups, '1', size), "1ghi");
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const char *repeated = "XXXXX";
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size = 6; // 5 characters + null terminator.
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// Should return the last X with the null terminator.
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ASSERT_STREQ(call_memrchr(repeated, 'X', size), "X");
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}
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TEST(LlvmLibcMemRChrTest, EmptyStringShouldOnlyMatchNullTerminator) {
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const size_t size = 1; // Null terminator.
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const char *empty_string = "";
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// Null terminator should match.
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ASSERT_STREQ(call_memrchr(empty_string, '\0', size), "");
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// All other characters should not match.
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ASSERT_STREQ(call_memrchr(empty_string, 'A', size), nullptr);
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ASSERT_STREQ(call_memrchr(empty_string, '9', size), nullptr);
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ASSERT_STREQ(call_memrchr(empty_string, '?', size), nullptr);
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}
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TEST(LlvmLibcMemRChrTest, SignedCharacterFound) {
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char c = -1;
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const size_t size = 1;
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char src[size] = {c};
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const char *actual = call_memrchr(src, c, size);
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// Should find the last character 'c'.
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ASSERT_EQ(actual[0], c);
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}
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TEST(LlvmLibcMemRChrTest, ZeroLengthShouldReturnNullptr) {
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const unsigned char src[4] = {'a', 'b', 'c', '\0'};
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// This will iterate over exactly zero characters, so should return nullptr.
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ASSERT_STREQ(call_memrchr(src, 'd', 0), nullptr);
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}
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