xref: /aosp_15_r20/external/llvm-libc/test/src/unistd/swab_test.cpp (revision 71db0c75aadcf003ffe3238005f61d7618a3fead)
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