1
2 //===-- Unittests for swab ------------------------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "src/unistd/swab.h"
11
12 #include "src/string/string_utils.h"
13 #include "test/UnitTest/Test.h"
14
TEST(LlvmLibcSwabTest,NegativeSizeIsNoOp)15 TEST(LlvmLibcSwabTest, NegativeSizeIsNoOp) {
16 const char *from = "abc";
17 char to[4] = {'x', 'y', 'z', '\0'};
18 LIBC_NAMESPACE::swab(from, to, -1);
19 ASSERT_STREQ(to, "xyz");
20 }
21
TEST(LlvmLibcSwabTest,ZeroSizeIsNoOp)22 TEST(LlvmLibcSwabTest, ZeroSizeIsNoOp) {
23 const char *from = "abc";
24 char to[4] = {'x', 'y', 'z', '\0'};
25 LIBC_NAMESPACE::swab(from, to, 0);
26 ASSERT_STREQ(to, "xyz");
27 }
28
TEST(LlvmLibcSwabTest,SingleByteIsNoOp)29 TEST(LlvmLibcSwabTest, SingleByteIsNoOp) {
30 char from[] = {'a'};
31 char to[4] = {'x', 'y', 'z', '\0'};
32 LIBC_NAMESPACE::swab(from, to, sizeof(from));
33 ASSERT_STREQ(to, "xyz");
34 }
35
TEST(LlvmLibcSwabTest,NullPtrsAreNotDeRefedIfNIsLessThanTwo)36 TEST(LlvmLibcSwabTest, NullPtrsAreNotDeRefedIfNIsLessThanTwo) {
37 // This test passes if a crash does not happen
38 LIBC_NAMESPACE::swab(nullptr, nullptr, -1);
39 LIBC_NAMESPACE::swab(nullptr, nullptr, 0);
40 LIBC_NAMESPACE::swab(nullptr, nullptr, 1);
41 }
42
TEST(LlvmLibcSwabTest,BytesAreSwappedWithEvenN)43 TEST(LlvmLibcSwabTest, BytesAreSwappedWithEvenN) {
44 {
45 const char *from = "ab";
46 char to[3] = {};
47 LIBC_NAMESPACE::swab(from, to,
48 LIBC_NAMESPACE::internal::string_length(from));
49 ASSERT_STREQ(to, "ba");
50 }
51 {
52 const char *from = "abcd";
53 char to[5] = {};
54 LIBC_NAMESPACE::swab(from, to,
55 LIBC_NAMESPACE::internal::string_length(from));
56 ASSERT_STREQ(to, "badc");
57 }
58 {
59 const char *from = "aAaAaA";
60 char to[7] = {};
61 LIBC_NAMESPACE::swab(from, to,
62 LIBC_NAMESPACE::internal::string_length(from));
63 ASSERT_STREQ(to, "AaAaAa");
64 }
65 }
66
TEST(LlvmLibcSwabTest,LastByteIgnoredWithOddN)67 TEST(LlvmLibcSwabTest, LastByteIgnoredWithOddN) {
68 {
69 const char *from = "aba";
70 char to[3] = {};
71 LIBC_NAMESPACE::swab(from, to,
72 LIBC_NAMESPACE::internal::string_length(from));
73 ASSERT_STREQ(to, "ba");
74 }
75 {
76 const char *from = "abcde";
77 char to[5] = {};
78 LIBC_NAMESPACE::swab(from, to,
79 LIBC_NAMESPACE::internal::string_length(from));
80 ASSERT_STREQ(to, "badc");
81 }
82 {
83 const char *from = "aAaAaAx";
84 char to[7] = {};
85 LIBC_NAMESPACE::swab(from, to,
86 LIBC_NAMESPACE::internal::string_length(from));
87 ASSERT_STREQ(to, "AaAaAa");
88 }
89 }
90