1 //===-- Unittests for strrchr ---------------------------------------------===//
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-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "src/string/strrchr.h"
10 #include "utils/UnitTest/Test.h"
11
TEST(StrRChrTest,FindsFirstCharacter)12 TEST(StrRChrTest, FindsFirstCharacter) {
13 const char *src = "abcde";
14
15 // Should return original string since 'a' is the first character.
16 ASSERT_STREQ(__llvm_libc::strrchr(src, 'a'), "abcde");
17 // Source string should not change.
18 ASSERT_STREQ(src, "abcde");
19 }
20
TEST(StrRChrTest,FindsMiddleCharacter)21 TEST(StrRChrTest, FindsMiddleCharacter) {
22 const char *src = "abcde";
23
24 // Should return characters after (and including) 'c'.
25 ASSERT_STREQ(__llvm_libc::strrchr(src, 'c'), "cde");
26 // Source string should not change.
27 ASSERT_STREQ(src, "abcde");
28 }
29
TEST(StrRChrTest,FindsLastCharacterThatIsNotNullTerminator)30 TEST(StrRChrTest, FindsLastCharacterThatIsNotNullTerminator) {
31 const char *src = "abcde";
32
33 // Should return 'e' and null-terminator.
34 ASSERT_STREQ(__llvm_libc::strrchr(src, 'e'), "e");
35 // Source string should not change.
36 ASSERT_STREQ(src, "abcde");
37 }
38
TEST(StrRChrTest,FindsNullTerminator)39 TEST(StrRChrTest, FindsNullTerminator) {
40 const char *src = "abcde";
41
42 // Should return null terminator.
43 ASSERT_STREQ(__llvm_libc::strrchr(src, '\0'), "");
44 // Source string should not change.
45 ASSERT_STREQ(src, "abcde");
46 }
47
TEST(StrRChrTest,FindsLastBehindFirstNullTerminator)48 TEST(StrRChrTest, FindsLastBehindFirstNullTerminator) {
49 const char src[6] = {'a', 'a', '\0', 'b', '\0', 'c'};
50 // 'b' is behind a null terminator, so should not be found.
51 ASSERT_STREQ(__llvm_libc::strrchr(src, 'b'), nullptr);
52 // Same goes for 'c'.
53 ASSERT_STREQ(__llvm_libc::strrchr(src, 'c'), nullptr);
54
55 // Should find the second of the two a's.
56 ASSERT_STREQ(__llvm_libc::strrchr(src, 'a'), "a");
57 }
58
TEST(StrRChrTest,CharacterNotWithinStringShouldReturnNullptr)59 TEST(StrRChrTest, CharacterNotWithinStringShouldReturnNullptr) {
60 // Since 'z' is not within the string, should return nullptr.
61 ASSERT_STREQ(__llvm_libc::strrchr("123?", 'z'), nullptr);
62 }
63
TEST(StrRChrTest,ShouldFindLastOfDuplicates)64 TEST(StrRChrTest, ShouldFindLastOfDuplicates) {
65 // '1' is duplicated in the string, but it should find the last copy.
66 ASSERT_STREQ(__llvm_libc::strrchr("abc1def1ghi", '1'), "1ghi");
67
68 const char *dups = "XXXXX";
69 // Should return the last occurrence of 'X'.
70 ASSERT_STREQ(__llvm_libc::strrchr(dups, 'X'), "X");
71 }
72
TEST(StrRChrTest,EmptyStringShouldOnlyMatchNullTerminator)73 TEST(StrRChrTest, EmptyStringShouldOnlyMatchNullTerminator) {
74 // Null terminator should match.
75 ASSERT_STREQ(__llvm_libc::strrchr("", '\0'), "");
76 // All other characters should not match.
77 ASSERT_STREQ(__llvm_libc::strrchr("", 'A'), nullptr);
78 ASSERT_STREQ(__llvm_libc::strrchr("", '2'), nullptr);
79 ASSERT_STREQ(__llvm_libc::strrchr("", '*'), nullptr);
80 }
81