1//===-- Unittests for strcspn ---------------------------------------------===//
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/strcspn.h"
10
11#include "test/UnitTest/Test.h"
12
13TEST(LlvmLibcStrCSpnTest, ComplementarySpanShouldNotGoPastNullTerminator) {
14 const char src[5] = {'a', 'b', '\0', 'c', 'd'};
15 EXPECT_EQ(LIBC_NAMESPACE::strcspn(src, "b"), size_t{1});
16 EXPECT_EQ(LIBC_NAMESPACE::strcspn(src, "d"), size_t{2});
17
18 // Same goes for the segment to be searched for.
19 const char segment[5] = {'1', '2', '\0', '3', '4'};
20 EXPECT_EQ(LIBC_NAMESPACE::strcspn("123", segment), size_t{0});
21}
22
23TEST(LlvmLibcStrCSpnTest, ComplementarySpanForEachIndividualCharacter) {
24 const char *src = "12345";
25 // The complementary span size should increment accordingly.
26 EXPECT_EQ(LIBC_NAMESPACE::strcspn(src, "1"), size_t{0});
27 EXPECT_EQ(LIBC_NAMESPACE::strcspn(src, "2"), size_t{1});
28 EXPECT_EQ(LIBC_NAMESPACE::strcspn(src, "3"), size_t{2});
29 EXPECT_EQ(LIBC_NAMESPACE::strcspn(src, "4"), size_t{3});
30 EXPECT_EQ(LIBC_NAMESPACE::strcspn(src, "5"), size_t{4});
31}
32
33TEST(LlvmLibcStrCSpnTest, ComplementarySpanIsStringLengthIfNoCharacterFound) {
34 // Null terminator.
35 EXPECT_EQ(LIBC_NAMESPACE::strcspn("", ""), size_t{0});
36 EXPECT_EQ(LIBC_NAMESPACE::strcspn("", "_"), size_t{0});
37 // Single character.
38 EXPECT_EQ(LIBC_NAMESPACE::strcspn("a", "b"), size_t{1});
39 // Multiple characters.
40 EXPECT_EQ(LIBC_NAMESPACE::strcspn("abc", "1"), size_t{3});
41}
42
43TEST(LlvmLibcStrCSpnTest, DuplicatedCharactersNotPartOfComplementarySpan) {
44 // Complementary span should be zero in all these cases.
45 EXPECT_EQ(LIBC_NAMESPACE::strcspn("a", "aa"), size_t{0});
46 EXPECT_EQ(LIBC_NAMESPACE::strcspn("aa", "a"), size_t{0});
47 EXPECT_EQ(LIBC_NAMESPACE::strcspn("aaa", "aa"), size_t{0});
48 EXPECT_EQ(LIBC_NAMESPACE::strcspn("aaaa", "aa"), size_t{0});
49 EXPECT_EQ(LIBC_NAMESPACE::strcspn("aaaa", "baa"), size_t{0});
50}
51

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