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LibC: Implement wcsrtombs

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This commit is contained in:
Tim Schumacher 2021-10-08 01:22:27 +02:00 • committed by Brian Gianforcaro
parent fccb06b2cd
commit b0babd062e
3 changed files with 91 additions and 0 deletions
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47
Tests/LibC/TestWchar.cpp
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@ -316,3 +316,50 @@ TEST_CASE(wcrtomb)
ret = wcrtomb(buf, L'\uFFFD', nullptr);
EXPECT_NE(ret, (size_t)-1);
}
TEST_CASE(wcsrtombs)
{
mbstate_t state = {};
char buf[MB_LEN_MAX * 4];
const wchar_t good_chars[] = { L'\U0001F41E', L'\U0001F41E', L'\0' };
const wchar_t bad_chars[] = { L'\U0001F41E', static_cast<wchar_t>(0x1111F41E), L'\0' };
const wchar_t* src;
size_t ret = 0;
// Convert normal and valid wchar_t values.
src = good_chars;
ret = wcsrtombs(buf, &src, 9, &state);
EXPECT_EQ(ret, 8ul);
EXPECT_EQ(memcmp(buf, "\xf0\x9f\x90\x9e\xf0\x9f\x90\x9e", 9), 0);
EXPECT_EQ(src, nullptr);
EXPECT_NE(mbsinit(&state), 0);
// Stop on invalid wchar values.
src = bad_chars;
ret = wcsrtombs(buf, &src, 9, &state);
EXPECT_EQ(ret, -1ul);
EXPECT_EQ(memcmp(buf, "\xf0\x9f\x90\x9e", 4), 0);
EXPECT_EQ(errno, EILSEQ);
EXPECT_EQ(src, bad_chars + 1);
// Valid characters but not enough space.
src = good_chars;
ret = wcsrtombs(buf, &src, 7, &state);
EXPECT_EQ(ret, 4ul);
EXPECT_EQ(memcmp(buf, "\xf0\x9f\x90\x9e", 4), 0);
EXPECT_EQ(src, good_chars + 1);
// Try a conversion with no destination and too short length.
src = good_chars;
ret = wcsrtombs(nullptr, &src, 2, &state);
EXPECT_EQ(ret, 8ul);
EXPECT_EQ(src, nullptr);
EXPECT_NE(mbsinit(&state), 0);
// Try a conversion using the internal anonymous state.
src = good_chars;
ret = wcsrtombs(buf, &src, 9, nullptr);
EXPECT_EQ(ret, 8ul);
EXPECT_EQ(memcmp(buf, "\xf0\x9f\x90\x9e\xf0\x9f\x90\x9e", 9), 0);
EXPECT_EQ(src, nullptr);
}