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//===-- Unittests for swab ------------------------------------------------===//
//
// 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 "src/unistd/swab.h"
#include "src/string/string_utils.h"
#include "test/UnitTest/Test.h"
TEST(LlvmLibcSwabTest, NegativeSizeIsNoOp) {
const char *from = "abc";
char to[4] = {'x', 'y', 'z', '\0'};
LIBC_NAMESPACE::swab(from, to, -1);
ASSERT_STREQ(to, "xyz");
}
TEST(LlvmLibcSwabTest, ZeroSizeIsNoOp) {
const char *from = "abc";
char to[4] = {'x', 'y', 'z', '\0'};
LIBC_NAMESPACE::swab(from, to, 0);
ASSERT_STREQ(to, "xyz");
}
TEST(LlvmLibcSwabTest, SingleByteIsNoOp) {
char from[] = {'a'};
char to[4] = {'x', 'y', 'z', '\0'};
LIBC_NAMESPACE::swab(from, to, sizeof(from));
ASSERT_STREQ(to, "xyz");
}
TEST(LlvmLibcSwabTest, NullPtrsAreNotDeRefedIfNIsLessThanTwo) {
// This test passes if a crash does not happen
LIBC_NAMESPACE::swab(nullptr, nullptr, -1);
LIBC_NAMESPACE::swab(nullptr, nullptr, 0);
LIBC_NAMESPACE::swab(nullptr, nullptr, 1);
}
TEST(LlvmLibcSwabTest, BytesAreSwappedWithEvenN) {
{
const char *from = "ab";
char to[3] = {};
LIBC_NAMESPACE::swab(from, to,
LIBC_NAMESPACE::internal::string_length(from));
ASSERT_STREQ(to, "ba");
}
{
const char *from = "abcd";
char to[5] = {};
LIBC_NAMESPACE::swab(from, to,
LIBC_NAMESPACE::internal::string_length(from));
ASSERT_STREQ(to, "badc");
}
{
const char *from = "aAaAaA";
char to[7] = {};
LIBC_NAMESPACE::swab(from, to,
LIBC_NAMESPACE::internal::string_length(from));
ASSERT_STREQ(to, "AaAaAa");
}
}
TEST(LlvmLibcSwabTest, LastByteIgnoredWithOddN) {
{
const char *from = "aba";
char to[3] = {};
LIBC_NAMESPACE::swab(from, to,
LIBC_NAMESPACE::internal::string_length(from));
ASSERT_STREQ(to, "ba");
}
{
const char *from = "abcde";
char to[5] = {};
LIBC_NAMESPACE::swab(from, to,
LIBC_NAMESPACE::internal::string_length(from));
ASSERT_STREQ(to, "badc");
}
{
const char *from = "aAaAaAx";
char to[7] = {};
LIBC_NAMESPACE::swab(from, to,
LIBC_NAMESPACE::internal::string_length(from));
ASSERT_STREQ(to, "AaAaAa");
}
}
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