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//===-- Unittests for mblen -----------------------------------------------===//
//
// 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 "hdr/errno_macros.h"
#include "src/wchar/mblen.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/Test.h"
using LlvmLibcMBLenTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
TEST_F(LlvmLibcMBLenTest, OneByte) {
const char *ch = "A";
int n = LIBC_NAMESPACE::mblen(ch, 1);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(n, 1);
// Should fail since we have not read enough
n = LIBC_NAMESPACE::mblen(ch, 0);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(n, -1);
}
TEST_F(LlvmLibcMBLenTest, TwoByte) {
const char ch[2] = {static_cast<char>(0xC2),
static_cast<char>(0x8E)}; // car symbol
int n = LIBC_NAMESPACE::mblen(ch, 4);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(n, 2);
// Should fail since we have not read enough
n = LIBC_NAMESPACE::mblen(ch, 1);
ASSERT_EQ(n, -1);
ASSERT_ERRNO_SUCCESS();
// Should fail after trying to read next byte too
n = LIBC_NAMESPACE::mblen(ch + 1, 1);
ASSERT_EQ(n, -1);
// This one should be an invalid starting byte so should set errno
ASSERT_ERRNO_EQ(EILSEQ);
}
TEST_F(LlvmLibcMBLenTest, ThreeByte) {
const char ch[3] = {static_cast<char>(0xE2), static_cast<char>(0x88),
static_cast<char>(0x91)}; // ∑ sigma symbol
int n = LIBC_NAMESPACE::mblen(ch, 3);
ASSERT_EQ(n, 3);
ASSERT_ERRNO_SUCCESS();
// Should fail since we have not read enough
n = LIBC_NAMESPACE::mblen(ch, 2);
ASSERT_EQ(n, -1);
ASSERT_ERRNO_SUCCESS();
}
TEST_F(LlvmLibcMBLenTest, FourByte) {
const char ch[4] = {static_cast<char>(0xF0), static_cast<char>(0x9F),
static_cast<char>(0xA4),
static_cast<char>(0xA1)}; // 🤡 clown emoji
int n = LIBC_NAMESPACE::mblen(ch, 4);
ASSERT_EQ(n, 4);
ASSERT_ERRNO_SUCCESS();
// Should fail since we have not read enough
n = LIBC_NAMESPACE::mblen(ch, 2);
ASSERT_EQ(n, -1);
ASSERT_ERRNO_SUCCESS();
}
TEST_F(LlvmLibcMBLenTest, InvalidByte) {
const char ch[1] = {static_cast<char>(0x80)};
int n = LIBC_NAMESPACE::mblen(ch, 1);
ASSERT_EQ(n, -1);
ASSERT_ERRNO_EQ(EILSEQ);
}
TEST_F(LlvmLibcMBLenTest, InvalidMultiByte) {
const char ch[4] = {static_cast<char>(0x80), static_cast<char>(0x00),
static_cast<char>(0x80),
static_cast<char>(0x00)}; // invalid sequence of bytes
// Trying to push all 4 should error
int n = LIBC_NAMESPACE::mblen(ch, 4);
ASSERT_EQ(n, -1);
ASSERT_ERRNO_EQ(EILSEQ);
// Trying to push the second and third should correspond to null wc
n = LIBC_NAMESPACE::mblen(ch + 1, 2);
ASSERT_EQ(n, 0);
ASSERT_ERRNO_SUCCESS();
}
TEST_F(LlvmLibcMBLenTest, NullString) {
// reading on nullptr should return 0
int n = LIBC_NAMESPACE::mblen(nullptr, 2);
ASSERT_EQ(n, 0);
ASSERT_ERRNO_SUCCESS();
// reading a null terminator should return 0
const char *ch = "\0";
n = LIBC_NAMESPACE::mblen(ch, 1);
ASSERT_EQ(n, 0);
}
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