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//===-- Unittests for mbtowc ---------------------------------------------===//
//
// 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 "hdr/types/wchar_t.h"
#include "src/stdlib/mbtowc.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/Test.h"
using LlvmLibcMBToWCTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
TEST_F(LlvmLibcMBToWCTest, OneByte) {
const char *ch = "A";
wchar_t dest[2];
int n = LIBC_NAMESPACE::mbtowc(dest, ch, 1);
ASSERT_EQ(static_cast<char>(*dest), 'A');
ASSERT_EQ(n, 1);
// Should fail since we have not read enough
n = LIBC_NAMESPACE::mbtowc(dest, ch, 0);
ASSERT_EQ(n, -1);
ASSERT_ERRNO_EQ(EILSEQ);
}
TEST_F(LlvmLibcMBToWCTest, TwoByte) {
const char ch[2] = {static_cast<char>(0xC2),
static_cast<char>(0x8E)}; // car symbol
wchar_t dest[2];
int n = LIBC_NAMESPACE::mbtowc(dest, ch, 2);
ASSERT_EQ(static_cast<int>(*dest), 142);
ASSERT_EQ(n, 2);
// Should fail since we have not read enough
n = LIBC_NAMESPACE::mbtowc(dest, ch, 1);
ASSERT_EQ(n, -1);
// Should fail after trying to read next byte too
n = LIBC_NAMESPACE::mbtowc(dest, ch + 1, 1);
ASSERT_EQ(n, -1);
ASSERT_ERRNO_EQ(EILSEQ);
}
TEST_F(LlvmLibcMBToWCTest, ThreeByte) {
const char ch[3] = {static_cast<char>(0xE2), static_cast<char>(0x88),
static_cast<char>(0x91)}; // ∑ sigma symbol
wchar_t dest[2];
int n = LIBC_NAMESPACE::mbtowc(dest, ch, 3);
ASSERT_EQ(static_cast<int>(*dest), 8721);
ASSERT_EQ(n, 3);
// Should fail since we have not read enough
n = LIBC_NAMESPACE::mbtowc(dest, ch, 2);
ASSERT_EQ(n, -1);
ASSERT_ERRNO_EQ(EILSEQ);
}
TEST_F(LlvmLibcMBToWCTest, FourByte) {
const char ch[4] = {static_cast<char>(0xF0), static_cast<char>(0x9F),
static_cast<char>(0xA4),
static_cast<char>(0xA1)}; // 🤡 clown emoji
wchar_t dest[2];
int n = LIBC_NAMESPACE::mbtowc(dest, ch, 4);
ASSERT_EQ(static_cast<int>(*dest), 129313);
ASSERT_EQ(n, 4);
// Should fail since we have not read enough
n = LIBC_NAMESPACE::mbtowc(dest, ch, 2);
ASSERT_EQ(n, -1);
ASSERT_ERRNO_EQ(EILSEQ);
}
TEST_F(LlvmLibcMBToWCTest, InvalidByte) {
const char ch[1] = {static_cast<char>(0x80)};
wchar_t dest[2];
int n = LIBC_NAMESPACE::mbtowc(dest, ch, 1);
ASSERT_EQ(n, -1);
ASSERT_ERRNO_EQ(EILSEQ);
}
TEST_F(LlvmLibcMBToWCTest, 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
wchar_t dest[2];
// Trying to push all 4 should error
int n = LIBC_NAMESPACE::mbtowc(dest, 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::mbtowc(dest, ch + 1, 2);
ASSERT_EQ(n, 0);
ASSERT_TRUE(*dest == L'\0');
}
TEST_F(LlvmLibcMBToWCTest, InvalidLastByte) {
// Last byte is invalid since it does not have correct starting sequence.
// 0xC0 --> 11000000 starting sequence should be 10xxxxxx
const char ch[4] = {static_cast<char>(0xF1), static_cast<char>(0x80),
static_cast<char>(0x80), static_cast<char>(0xC0)};
wchar_t dest[2];
// Trying to push all 4 should error
int n = LIBC_NAMESPACE::mbtowc(dest, ch, 4);
ASSERT_EQ(n, -1);
ASSERT_ERRNO_EQ(EILSEQ);
}
TEST_F(LlvmLibcMBToWCTest, ValidTwoByteWithExtraRead) {
const char ch[3] = {static_cast<char>(0xC2), static_cast<char>(0x8E),
static_cast<char>(0x80)};
wchar_t dest[2];
// Trying to push all 3 should return valid 2 byte
int n = LIBC_NAMESPACE::mbtowc(dest, ch, 3);
ASSERT_EQ(n, 2);
ASSERT_EQ(static_cast<int>(*dest), 142);
}
TEST_F(LlvmLibcMBToWCTest, TwoValidTwoBytes) {
const char ch[4] = {static_cast<char>(0xC2), static_cast<char>(0x8E),
static_cast<char>(0xC7), static_cast<char>(0x8C)};
wchar_t dest[2];
int n = LIBC_NAMESPACE::mbtowc(dest, ch, 2);
ASSERT_EQ(n, 2);
ASSERT_EQ(static_cast<int>(*dest), 142);
n = LIBC_NAMESPACE::mbtowc(dest + 1, ch + 2, 2);
ASSERT_EQ(n, 2);
ASSERT_EQ(static_cast<int>(*(dest + 1)), 460);
}
TEST_F(LlvmLibcMBToWCTest, NullString) {
wchar_t dest[2] = {L'O', L'K'};
// reading on nullptr should return 0
int n = LIBC_NAMESPACE::mbtowc(dest, nullptr, 2);
ASSERT_EQ(n, 0);
ASSERT_TRUE(dest[0] == L'O');
// reading a null terminator should return 0
const char *ch = "\0";
n = LIBC_NAMESPACE::mbtowc(dest, ch, 1);
ASSERT_EQ(n, 0);
}
TEST_F(LlvmLibcMBToWCTest, NullWCPtr) {
const char ch[2] = {
static_cast<char>(0xC2),
static_cast<char>(0x8E),
};
// a null destination should still return the number of read bytes
int n = LIBC_NAMESPACE::mbtowc(nullptr, ch, 2);
ASSERT_EQ(n, 2);
}
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