libc/test/src/string/strcspn_test.cpp

   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
  13 TEST(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
  23 TEST(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
  33 TEST(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
  43 TEST(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 }