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//===-- Unittests for strncpy ---------------------------------------------===//
//
// 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/__support/CPP/span.h"
#include "src/string/strncpy.h"
#include "test/UnitTest/Test.h"
#include <stddef.h> // For size_t.
class LlvmLibcStrncpyTest : public LIBC_NAMESPACE::testing::Test {
public:
void check_strncpy(LIBC_NAMESPACE::cpp::span<char> dst,
const LIBC_NAMESPACE::cpp::span<const char> src, size_t n,
const LIBC_NAMESPACE::cpp::span<const char> expected) {
// Making sure we don't overflow buffer.
ASSERT_GE(dst.size(), n);
// Making sure strncpy returns dst.
ASSERT_EQ(LIBC_NAMESPACE::strncpy(dst.data(), src.data(), n), dst.data());
// Expected must be of the same size as dst.
ASSERT_EQ(dst.size(), expected.size());
// Expected and dst are the same.
for (size_t i = 0; i < expected.size(); ++i)
ASSERT_EQ(expected[i], dst[i]);
}
};
TEST_F(LlvmLibcStrncpyTest, Untouched) {
char dst[] = {'a', 'b'};
const char src[] = {'x', '\0'};
const char expected[] = {'a', 'b'};
check_strncpy(dst, src, 0, expected);
}
TEST_F(LlvmLibcStrncpyTest, CopyOne) {
char dst[] = {'a', 'b'};
const char src[] = {'x', 'y'};
const char expected[] = {'x', 'b'}; // no \0 is appended
check_strncpy(dst, src, 1, expected);
}
TEST_F(LlvmLibcStrncpyTest, CopyNull) {
char dst[] = {'a', 'b'};
const char src[] = {'\0', 'y'};
const char expected[] = {'\0', 'b'};
check_strncpy(dst, src, 1, expected);
}
TEST_F(LlvmLibcStrncpyTest, CopyPastSrc) {
char dst[] = {'a', 'b'};
const char src[] = {'\0', 'y'};
const char expected[] = {'\0', '\0'};
check_strncpy(dst, src, 2, expected);
}
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