1//===-- Unittests for strspn ----------------------------------------------===//
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/strspn.h"
10
11#include "test/UnitTest/Test.h"
12
13TEST(LlvmLibcStrSpnTest, EmptyStringShouldReturnZeroLengthSpan) {
14 // The search should not include the null terminator.
15 EXPECT_EQ(LIBC_NAMESPACE::strspn("", ""), size_t{0});
16 EXPECT_EQ(LIBC_NAMESPACE::strspn("_", ""), size_t{0});
17 EXPECT_EQ(LIBC_NAMESPACE::strspn("", "_"), size_t{0});
18}
19
20TEST(LlvmLibcStrSpnTest, ShouldNotSpanAnythingAfterNullTerminator) {
21 const char src[4] = {'a', 'b', '\0', 'c'};
22 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "ab"), size_t{2});
23 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "c"), size_t{0});
24
25 // Same goes for the segment to be searched for.
26 const char segment[4] = {'1', '2', '\0', '3'};
27 EXPECT_EQ(LIBC_NAMESPACE::strspn("123", segment), size_t{2});
28}
29
30TEST(LlvmLibcStrSpnTest, SpanEachIndividualCharacter) {
31 const char *src = "12345";
32 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "1"), size_t{1});
33 // Since '1' is not within the segment, the span
34 // size should remain zero.
35 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "2"), size_t{0});
36 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "3"), size_t{0});
37 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "4"), size_t{0});
38 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "5"), size_t{0});
39}
40
41TEST(LlvmLibcStrSpnTest, UnmatchedCharacterShouldNotBeCountedInSpan) {
42 EXPECT_EQ(LIBC_NAMESPACE::strspn("a", "b"), size_t{0});
43 EXPECT_EQ(LIBC_NAMESPACE::strspn("abcdef", "1"), size_t{0});
44 EXPECT_EQ(LIBC_NAMESPACE::strspn("123", "4"), size_t{0});
45}
46
47TEST(LlvmLibcStrSpnTest, SequentialCharactersShouldSpan) {
48 const char *src = "abcde";
49 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "a"), size_t{1});
50 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "ab"), size_t{2});
51 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "abc"), size_t{3});
52 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "abcd"), size_t{4});
53 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "abcde"), size_t{5});
54 // Same thing for when the roles are reversed.
55 EXPECT_EQ(LIBC_NAMESPACE::strspn("abcde", src), size_t{5});
56 EXPECT_EQ(LIBC_NAMESPACE::strspn("abcd", src), size_t{4});
57 EXPECT_EQ(LIBC_NAMESPACE::strspn("abc", src), size_t{3});
58 EXPECT_EQ(LIBC_NAMESPACE::strspn("ab", src), size_t{2});
59 EXPECT_EQ(LIBC_NAMESPACE::strspn("a", src), size_t{1});
60}
61
62TEST(LlvmLibcStrSpnTest, NonSequentialCharactersShouldNotSpan) {
63 const char *src = "123456789";
64 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "_1_abc_2_def_3_"), size_t{3});
65 // Only spans 4 since '5' is not within the span.
66 EXPECT_EQ(LIBC_NAMESPACE::strspn(src, "67__34abc12"), size_t{4});
67}
68
69TEST(LlvmLibcStrSpnTest, ReverseCharacters) {
70 // Since these are still sequential, this should span.
71 EXPECT_EQ(LIBC_NAMESPACE::strspn("12345", "54321"), size_t{5});
72 // Does not span any since '1' is not within the span.
73 EXPECT_EQ(LIBC_NAMESPACE::strspn("12345", "432"), size_t{0});
74 // Only spans 1 since '2' is not within the span.
75 EXPECT_EQ(LIBC_NAMESPACE::strspn("12345", "51"), size_t{1});
76}
77
78TEST(LlvmLibcStrSpnTest, DuplicatedCharactersToBeSearchedForShouldStillMatch) {
79 // Only a single character, so only spans 1.
80 EXPECT_EQ(LIBC_NAMESPACE::strspn("a", "aa"), size_t{1});
81 // This should count once for each 'a' in the source string.
82 EXPECT_EQ(LIBC_NAMESPACE::strspn("aa", "aa"), size_t{2});
83 EXPECT_EQ(LIBC_NAMESPACE::strspn("aaa", "aa"), size_t{3});
84 EXPECT_EQ(LIBC_NAMESPACE::strspn("aaaa", "aa"), size_t{4});
85}
86

source code of libc/test/src/string/strspn_test.cpp