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//===-- Unittests for mbsetowcs -------------------------------------------===//
//
// 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/mbstate_t.h"
#include "hdr/types/wchar_t.h"
#include "src/__support/macros/null_check.h"
#include "src/__support/wchar/mbstate.h"
#include "src/string/memset.h"
#include "src/wchar/mbsnrtowcs.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/Test.h"
using LlvmLibcMBSNRToWCSTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
TEST_F(LlvmLibcMBSNRToWCSTest, OneByteOneChar) {
const char *ch = "A";
const char *original = ch;
wchar_t dest[2];
mbstate_t mb;
LIBC_NAMESPACE::memset(&mb, 0, sizeof(mbstate_t));
size_t n = LIBC_NAMESPACE::mbsnrtowcs(dest, &ch, 1, 1, &mb);
ASSERT_EQ(static_cast<char>(*dest), 'A');
ASSERT_EQ(static_cast<int>(n), 1);
// Should point to null terminator now
ASSERT_EQ(ch, original + 1);
ASSERT_ERRNO_SUCCESS();
n = LIBC_NAMESPACE::mbsnrtowcs(dest + 1, &ch, 1, 1, &mb);
ASSERT_EQ(static_cast<char>(dest[1]), '\0');
// Should not include null terminator
ASSERT_EQ(static_cast<int>(n), 0);
// Should now be a nullptr
ASSERT_EQ(ch, nullptr);
ASSERT_ERRNO_SUCCESS();
}
TEST_F(LlvmLibcMBSNRToWCSTest, FourByteOneChar) {
const char *src = "\xf0\x9f\x98\xb9"; // laughing cat emoji 😹
const char *original = src;
wchar_t dest[2];
mbstate_t mb;
LIBC_NAMESPACE::memset(&mb, 0, sizeof(mbstate_t));
// Not enough bytes for the full character
size_t n = LIBC_NAMESPACE::mbsnrtowcs(dest, &src, 3, 2, &mb);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(static_cast<int>(n), 0);
ASSERT_EQ(src, original + 3);
// Needs 2 more bytes (last byte of cat + null terminator)
n = LIBC_NAMESPACE::mbsnrtowcs(dest, &src, 2, 2, &mb);
ASSERT_ERRNO_SUCCESS();
// Does not include null terminator
ASSERT_EQ(static_cast<int>(n), 1);
ASSERT_EQ(src, nullptr);
ASSERT_EQ(static_cast<int>(dest[0]), 128569);
ASSERT_TRUE(dest[1] == L'\0');
}
TEST_F(LlvmLibcMBSNRToWCSTest, MixedNumberOfBytes) {
// 'A', sigma symbol 'Σ', recycling symbol '♻', laughing cat emoji '😹'
const char *src = "A\xce\xa3\xe2\x99\xbb\xf0\x9f\x98\xb9";
const char *original = src;
wchar_t dest[5];
mbstate_t mb;
LIBC_NAMESPACE::memset(&mb, 0, sizeof(mbstate_t));
// Read 'A'
size_t n = LIBC_NAMESPACE::mbsnrtowcs(dest, &src, 1, 1, &mb);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(static_cast<char>(dest[0]), 'A');
ASSERT_EQ(static_cast<int>(n), 1);
ASSERT_EQ(src, original + 1);
// Read sigma 'Σ'
n = LIBC_NAMESPACE::mbsnrtowcs(dest + 1, &src, 2, 1, &mb);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(static_cast<int>(dest[1]), 931);
ASSERT_EQ(static_cast<int>(n), 1);
ASSERT_EQ(src, original + 3);
// Read recycling 'â™»'
n = LIBC_NAMESPACE::mbsnrtowcs(dest + 2, &src, 2, 5, &mb);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(static_cast<int>(n), 0);
ASSERT_EQ(src, original + 5);
n = LIBC_NAMESPACE::mbsnrtowcs(dest + 2, &src, 1, 1, &mb);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(static_cast<int>(n), 1);
ASSERT_EQ(src, original + 6);
ASSERT_EQ(static_cast<int>(dest[2]), 9851);
// Read laughing cat emoji '😹'
n = LIBC_NAMESPACE::mbsnrtowcs(dest + 3, &src, 4, 5, &mb);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(static_cast<int>(n), 1);
ASSERT_EQ(src, original + 10);
ASSERT_EQ(static_cast<int>(dest[3]), 128569);
n = LIBC_NAMESPACE::mbsnrtowcs(dest + 4, &src, 4, 4, nullptr);
ASSERT_TRUE(dest[4] == L'\0');
ASSERT_ERRNO_SUCCESS();
// Should not count null terminator in number
ASSERT_EQ(static_cast<int>(n), 0);
// Should now be a nullptr
ASSERT_EQ(src, nullptr);
}
TEST_F(LlvmLibcMBSNRToWCSTest, ReadLessThanStringLength) {
// Four laughing cat emojis "😹😹😹😹"
const char *src =
"\xf0\x9f\x98\xb9\xf0\x9f\x98\xb9\xf0\x9f\x98\xb9\xf0\x9f\x98\xb9";
const char *original = src;
wchar_t dest[5] = {L'a', L'b', L'c', L'd', L'e'};
size_t n = LIBC_NAMESPACE::mbsnrtowcs(dest, &src, 100, 3, nullptr);
ASSERT_ERRNO_SUCCESS();
// Should have read 3 emojis
ASSERT_EQ(static_cast<int>(n), 3);
ASSERT_EQ(static_cast<int>(dest[0]), 128569);
ASSERT_EQ(static_cast<int>(dest[1]), 128569);
ASSERT_EQ(static_cast<int>(dest[2]), 128569);
ASSERT_TRUE(dest[3] == L'd');
ASSERT_TRUE(dest[4] == L'e');
// Read three laughing cat emojis, 12 bytes
ASSERT_EQ(src, original + 12);
}
TEST_F(LlvmLibcMBSNRToWCSTest, InvalidFirstByte) {
// 0x80 is invalid first byte of mb character
const char *src =
"\x80\x9f\x98\xb9\xf0\x9f\x98\xb9\xf0\x9f\x98\xb9\xf0\x9f\x98\xb9";
const char *original = src;
wchar_t dest[3];
size_t n = LIBC_NAMESPACE::mbsnrtowcs(dest, &src, 88, 88, nullptr);
// Should return error and set errno
ASSERT_EQ(static_cast<int>(n), -1);
ASSERT_ERRNO_EQ(EILSEQ);
// Should not update pointer
ASSERT_EQ(src, original);
}
TEST_F(LlvmLibcMBSNRToWCSTest, InvalidMiddleByte) {
// The 7th byte is invalid for a 4 byte character
const char *src =
"\xf0\x9f\x98\xb9\xf0\x9f\xf0\xb9\xf0\x9f\x98\xb9\xf0\x9f\x98\xb9";
const char *original = src;
wchar_t dest[3];
mbstate_t mb;
LIBC_NAMESPACE::memset(&mb, 0, sizeof(mbstate_t));
// Successfully read one character and first byte of the second character
size_t n = LIBC_NAMESPACE::mbsnrtowcs(dest, &src, 5, 88, &mb);
ASSERT_EQ(static_cast<int>(n), 1);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(src, original + 5);
ASSERT_EQ(static_cast<int>(dest[0]), 128569);
n = LIBC_NAMESPACE::mbsnrtowcs(dest + 1, &src, 5, 88, &mb);
// Should return error, set errno, and not update the pointer
ASSERT_EQ(static_cast<int>(n), -1);
ASSERT_ERRNO_EQ(EILSEQ);
ASSERT_EQ(src, original + 5);
}
TEST_F(LlvmLibcMBSNRToWCSTest, NullDestination) {
// Four laughing cat emojis "😹😹😹😹"
const char *src =
"\xf0\x9f\x98\xb9\xf0\x9f\x98\xb9\xf0\x9f\x98\xb9\xf0\x9f\x98\xb9";
const char *original = src;
size_t n = LIBC_NAMESPACE::mbsnrtowcs(nullptr, &src, 88, 88, nullptr);
ASSERT_ERRNO_SUCCESS();
// Null destination should ignore len and read till end of string
ASSERT_EQ(static_cast<int>(n), 4);
// It should also not change the src pointer
ASSERT_EQ(src, original);
}
TEST_F(LlvmLibcMBSNRToWCSTest, ErrnoChecks) {
// Two laughing cat emojis and invalid 3rd mb char (3rd byte of it)
const char *src =
"\xf0\x9f\x98\xb9\xf0\x9f\x98\xb9\xf0\x9f\xf0\xb9\xf0\x9f\x98\xb9";
const char *original = src;
wchar_t dest[5];
mbstate_t mb;
LIBC_NAMESPACE::memset(&mb, 0, sizeof(mbstate_t));
// First two bytes are valid --> should not set errno
size_t n = LIBC_NAMESPACE::mbsnrtowcs(dest, &src, 80, 2, &mb);
ASSERT_ERRNO_SUCCESS();
ASSERT_EQ(static_cast<int>(n), 2);
ASSERT_EQ(static_cast<int>(dest[0]), 128569);
ASSERT_EQ(static_cast<int>(dest[1]), 128569);
ASSERT_EQ(src, original + 8);
// Trying to read the 3rd byte should set errno
n = LIBC_NAMESPACE::mbsnrtowcs(dest + 2, &src, 4, 2, &mb);
ASSERT_ERRNO_EQ(EILSEQ);
ASSERT_EQ(static_cast<int>(n), -1);
// Should not move the pointer
ASSERT_EQ(src, original + 8);
}
#if defined(LIBC_ADD_NULL_CHECKS)
TEST(LlvmLibcMBSNRToWCSTest, NullptrCrash) {
// Passing in a nullptr should crash the program.
EXPECT_DEATH(
[] { LIBC_NAMESPACE::mbsnrtowcs(nullptr, nullptr, 1, 1, nullptr); },
WITH_SIGNAL(-1));
}
#endif // LIBC_ADD_NULL_CHECKS
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