155 lines · cpp
1//===-- Unittests for mbtowc ---------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "hdr/errno_macros.h"10#include "hdr/types/wchar_t.h"11#include "src/stdlib/mbtowc.h"12#include "test/UnitTest/ErrnoCheckingTest.h"13#include "test/UnitTest/Test.h"14 15using LlvmLibcMBToWCTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;16 17TEST_F(LlvmLibcMBToWCTest, OneByte) {18 const char *ch = "A";19 wchar_t dest[2];20 int n = LIBC_NAMESPACE::mbtowc(dest, ch, 1);21 ASSERT_EQ(static_cast<char>(*dest), 'A');22 ASSERT_EQ(n, 1);23 24 // Should fail since we have not read enough25 n = LIBC_NAMESPACE::mbtowc(dest, ch, 0);26 ASSERT_EQ(n, -1);27 ASSERT_ERRNO_EQ(EILSEQ);28}29 30TEST_F(LlvmLibcMBToWCTest, TwoByte) {31 const char ch[2] = {static_cast<char>(0xC2),32 static_cast<char>(0x8E)}; // car symbol33 wchar_t dest[2];34 int n = LIBC_NAMESPACE::mbtowc(dest, ch, 2);35 ASSERT_EQ(static_cast<int>(*dest), 142);36 ASSERT_EQ(n, 2);37 38 // Should fail since we have not read enough39 n = LIBC_NAMESPACE::mbtowc(dest, ch, 1);40 ASSERT_EQ(n, -1);41 // Should fail after trying to read next byte too42 n = LIBC_NAMESPACE::mbtowc(dest, ch + 1, 1);43 ASSERT_EQ(n, -1);44 ASSERT_ERRNO_EQ(EILSEQ);45}46 47TEST_F(LlvmLibcMBToWCTest, ThreeByte) {48 const char ch[3] = {static_cast<char>(0xE2), static_cast<char>(0x88),49 static_cast<char>(0x91)}; // ∑ sigma symbol50 wchar_t dest[2];51 int n = LIBC_NAMESPACE::mbtowc(dest, ch, 3);52 ASSERT_EQ(static_cast<int>(*dest), 8721);53 ASSERT_EQ(n, 3);54 55 // Should fail since we have not read enough56 n = LIBC_NAMESPACE::mbtowc(dest, ch, 2);57 ASSERT_EQ(n, -1);58 ASSERT_ERRNO_EQ(EILSEQ);59}60 61TEST_F(LlvmLibcMBToWCTest, FourByte) {62 const char ch[4] = {static_cast<char>(0xF0), static_cast<char>(0x9F),63 static_cast<char>(0xA4),64 static_cast<char>(0xA1)}; // 🤡 clown emoji65 wchar_t dest[2];66 int n = LIBC_NAMESPACE::mbtowc(dest, ch, 4);67 ASSERT_EQ(static_cast<int>(*dest), 129313);68 ASSERT_EQ(n, 4);69 70 // Should fail since we have not read enough71 n = LIBC_NAMESPACE::mbtowc(dest, ch, 2);72 ASSERT_EQ(n, -1);73 ASSERT_ERRNO_EQ(EILSEQ);74}75 76TEST_F(LlvmLibcMBToWCTest, InvalidByte) {77 const char ch[1] = {static_cast<char>(0x80)};78 wchar_t dest[2];79 int n = LIBC_NAMESPACE::mbtowc(dest, ch, 1);80 ASSERT_EQ(n, -1);81 ASSERT_ERRNO_EQ(EILSEQ);82}83 84TEST_F(LlvmLibcMBToWCTest, InvalidMultiByte) {85 const char ch[4] = {static_cast<char>(0x80), static_cast<char>(0x00),86 static_cast<char>(0x80),87 static_cast<char>(0x00)}; // invalid sequence of bytes88 wchar_t dest[2];89 // Trying to push all 4 should error90 int n = LIBC_NAMESPACE::mbtowc(dest, ch, 4);91 ASSERT_EQ(n, -1);92 ASSERT_ERRNO_EQ(EILSEQ);93 94 // Trying to push the second and third should correspond to null wc95 n = LIBC_NAMESPACE::mbtowc(dest, ch + 1, 2);96 ASSERT_EQ(n, 0);97 ASSERT_TRUE(*dest == L'\0');98}99 100TEST_F(LlvmLibcMBToWCTest, InvalidLastByte) {101 // Last byte is invalid since it does not have correct starting sequence.102 // 0xC0 --> 11000000 starting sequence should be 10xxxxxx103 const char ch[4] = {static_cast<char>(0xF1), static_cast<char>(0x80),104 static_cast<char>(0x80), static_cast<char>(0xC0)};105 wchar_t dest[2];106 // Trying to push all 4 should error107 int n = LIBC_NAMESPACE::mbtowc(dest, ch, 4);108 ASSERT_EQ(n, -1);109 ASSERT_ERRNO_EQ(EILSEQ);110}111 112TEST_F(LlvmLibcMBToWCTest, ValidTwoByteWithExtraRead) {113 const char ch[3] = {static_cast<char>(0xC2), static_cast<char>(0x8E),114 static_cast<char>(0x80)};115 wchar_t dest[2];116 // Trying to push all 3 should return valid 2 byte117 int n = LIBC_NAMESPACE::mbtowc(dest, ch, 3);118 ASSERT_EQ(n, 2);119 ASSERT_EQ(static_cast<int>(*dest), 142);120}121 122TEST_F(LlvmLibcMBToWCTest, TwoValidTwoBytes) {123 const char ch[4] = {static_cast<char>(0xC2), static_cast<char>(0x8E),124 static_cast<char>(0xC7), static_cast<char>(0x8C)};125 wchar_t dest[2];126 int n = LIBC_NAMESPACE::mbtowc(dest, ch, 2);127 ASSERT_EQ(n, 2);128 ASSERT_EQ(static_cast<int>(*dest), 142);129 n = LIBC_NAMESPACE::mbtowc(dest + 1, ch + 2, 2);130 ASSERT_EQ(n, 2);131 ASSERT_EQ(static_cast<int>(*(dest + 1)), 460);132}133 134TEST_F(LlvmLibcMBToWCTest, NullString) {135 wchar_t dest[2] = {L'O', L'K'};136 // reading on nullptr should return 0137 int n = LIBC_NAMESPACE::mbtowc(dest, nullptr, 2);138 ASSERT_EQ(n, 0);139 ASSERT_TRUE(dest[0] == L'O');140 // reading a null terminator should return 0141 const char *ch = "\0";142 n = LIBC_NAMESPACE::mbtowc(dest, ch, 1);143 ASSERT_EQ(n, 0);144}145 146TEST_F(LlvmLibcMBToWCTest, NullWCPtr) {147 const char ch[2] = {148 static_cast<char>(0xC2),149 static_cast<char>(0x8E),150 };151 // a null destination should still return the number of read bytes152 int n = LIBC_NAMESPACE::mbtowc(nullptr, ch, 2);153 ASSERT_EQ(n, 2);154}155