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//===-- Tests for str{,r}chr and {,r}index functions ------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "test/UnitTest/Test.h"
template <auto Func> struct StrchrTest : public LIBC_NAMESPACE::testing::Test {
void findsFirstCharacter() {
const char *src = "abcde";
// Should return original string since 'a' is the first character.
ASSERT_STREQ(Func(src, 'a'), "abcde");
// Source string should not change.
ASSERT_STREQ(src, "abcde");
}
void findsMiddleCharacter() {
const char *src = "abcde";
// Should return characters after (and including) 'c'.
ASSERT_STREQ(Func(src, 'c'), "cde");
// Source string should not change.
ASSERT_STREQ(src, "abcde");
}
void findsLastCharacterThatIsNotNullTerminator() {
const char *src = "abcde";
// Should return 'e' and null-terminator.
ASSERT_STREQ(Func(src, 'e'), "e");
// Source string should not change.
ASSERT_STREQ(src, "abcde");
}
void findsNullTerminator() {
const char *src = "abcde";
// Should return null terminator.
const char *nul_terminator = Func(src, '\0');
ASSERT_NE(nul_terminator, nullptr);
ASSERT_STREQ(nul_terminator, "");
// Source string should not change.
ASSERT_STREQ(src, "abcde");
}
void characterNotWithinStringShouldReturnNullptr() {
// Since 'z' is not within the string, should return nullptr.
ASSERT_EQ(Func("123?", 'z'), nullptr);
}
void theSourceShouldNotChange() {
const char *src = "abcde";
// When the character is found, the source string should not change.
Func(src, 'd');
ASSERT_STREQ(src, "abcde");
// Same case for when the character is not found.
Func(src, 'z');
ASSERT_STREQ(src, "abcde");
// Same case for when looking for nullptr.
Func(src, '\0');
ASSERT_STREQ(src, "abcde");
}
void shouldFindFirstOfDuplicates() {
// '1' is duplicated in the string, but it should find the first copy.
ASSERT_STREQ(Func("abc1def1ghi", '1'), "1def1ghi");
const char *dups = "XXXXX";
// Should return original string since 'X' is the first character.
ASSERT_STREQ(Func(dups, 'X'), dups);
}
void emptyStringShouldOnlyMatchNullTerminator() {
// Null terminator should match.
const char empty_string[] = "";
ASSERT_EQ(static_cast<const char *>(Func(empty_string, '\0')),
empty_string);
// All other characters should not match.
ASSERT_EQ(Func("", 'Z'), nullptr);
ASSERT_EQ(Func("", '3'), nullptr);
ASSERT_EQ(Func("", '*'), nullptr);
}
};
template <auto Func> struct StrrchrTest : public LIBC_NAMESPACE::testing::Test {
void findsFirstCharacter() {
const char *src = "abcde";
// Should return original string since 'a' is the first character.
ASSERT_STREQ(Func(src, 'a'), "abcde");
// Source string should not change.
ASSERT_STREQ(src, "abcde");
}
void findsMiddleCharacter() {
const char *src = "abcde";
// Should return characters after (and including) 'c'.
ASSERT_STREQ(Func(src, 'c'), "cde");
// Source string should not change.
ASSERT_STREQ(src, "abcde");
}
void findsLastCharacterThatIsNotNullTerminator() {
const char *src = "abcde";
// Should return 'e' and null-terminator.
ASSERT_STREQ(Func(src, 'e'), "e");
// Source string should not change.
ASSERT_STREQ(src, "abcde");
}
void findsNullTerminator() {
const char *src = "abcde";
// Should return null terminator.
const char *nul_terminator = Func(src, '\0');
ASSERT_NE(nul_terminator, nullptr);
ASSERT_STREQ(nul_terminator, "");
// Source string should not change.
ASSERT_STREQ(src, "abcde");
}
void findsLastBehindFirstNullTerminator() {
static const char src[6] = {'a', 'a', '\0', 'b', '\0', 'c'};
// 'b' is behind a null terminator, so should not be found.
ASSERT_EQ(Func(src, 'b'), nullptr);
// Same goes for 'c'.
ASSERT_EQ(Func(src, 'c'), nullptr);
// Should find the second of the two a's.
ASSERT_STREQ(Func(src, 'a'), "a");
}
void characterNotWithinStringShouldReturnNullptr() {
// Since 'z' is not within the string, should return nullptr.
ASSERT_EQ(Func("123?", 'z'), nullptr);
}
void shouldFindLastOfDuplicates() {
// '1' is duplicated in the string, but it should find the last copy.
ASSERT_STREQ(Func("abc1def1ghi", '1'), "1ghi");
const char *dups = "XXXXX";
// Should return the last occurrence of 'X'.
ASSERT_STREQ(Func(dups, 'X'), "X");
}
void emptyStringShouldOnlyMatchNullTerminator() {
// Null terminator should match.
const char empty_string[] = "";
ASSERT_EQ(static_cast<const char *>(Func(empty_string, '\0')),
empty_string);
// All other characters should not match.
ASSERT_EQ(Func("", 'A'), nullptr);
ASSERT_EQ(Func("", '2'), nullptr);
ASSERT_EQ(Func("", '*'), nullptr);
}
};
#define STRCHR_TEST(name, func) \
using LlvmLibc##name##Test = StrchrTest<func>; \
TEST_F(LlvmLibc##name##Test, FindsFirstCharacter) { findsFirstCharacter(); } \
TEST_F(LlvmLibc##name##Test, FindsMiddleCharacter) { \
findsMiddleCharacter(); \
} \
TEST_F(LlvmLibc##name##Test, FindsLastCharacterThatIsNotNullTerminator) { \
findsLastCharacterThatIsNotNullTerminator(); \
} \
TEST_F(LlvmLibc##name##Test, FindsNullTerminator) { findsNullTerminator(); } \
TEST_F(LlvmLibc##name##Test, CharacterNotWithinStringShouldReturnNullptr) { \
characterNotWithinStringShouldReturnNullptr(); \
} \
TEST_F(LlvmLibc##name##Test, TheSourceShouldNotChange) { \
theSourceShouldNotChange(); \
} \
TEST_F(LlvmLibc##name##Test, ShouldFindFirstOfDuplicates) { \
shouldFindFirstOfDuplicates(); \
} \
TEST_F(LlvmLibc##name##Test, EmptyStringShouldOnlyMatchNullTerminator) { \
emptyStringShouldOnlyMatchNullTerminator(); \
}
#define STRRCHR_TEST(name, func) \
using LlvmLibc##name##Test = StrrchrTest<func>; \
TEST_F(LlvmLibc##name##Test, FindsFirstCharacter) { findsFirstCharacter(); } \
TEST_F(LlvmLibc##name##Test, FindsMiddleCharacter) { \
findsMiddleCharacter(); \
} \
TEST_F(LlvmLibc##name##Test, FindsLastCharacterThatIsNotNullTerminator) { \
findsLastCharacterThatIsNotNullTerminator(); \
} \
TEST_F(LlvmLibc##name##Test, FindsNullTerminator) { findsNullTerminator(); } \
TEST_F(LlvmLibc##name##Test, FindsLastBehindFirstNullTerminator) { \
findsLastBehindFirstNullTerminator(); \
} \
TEST_F(LlvmLibc##name##Test, CharacterNotWithinStringShouldReturnNullptr) { \
characterNotWithinStringShouldReturnNullptr(); \
} \
TEST_F(LlvmLibc##name##Test, ShouldFindLastOfDuplicates) { \
shouldFindLastOfDuplicates(); \
} \
TEST_F(LlvmLibc##name##Test, EmptyStringShouldOnlyMatchNullTerminator) { \
emptyStringShouldOnlyMatchNullTerminator(); \
}
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