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LibC: Implement mbsrtowcs

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This commit is contained in:
Tim Schumacher 2021-10-10 21:34:00 +02:00 • committed by Brian Gianforcaro
parent b0babd062e
commit 420bdccf0b
3 changed files with 86 additions and 0 deletions
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51
Tests/LibC/TestWchar.cpp
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@ -363,3 +363,54 @@ TEST_CASE(wcsrtombs)
EXPECT_EQ(memcmp(buf, "\xf0\x9f\x90\x9e\xf0\x9f\x90\x9e", 9), 0);
EXPECT_EQ(src, nullptr);
}
TEST_CASE(mbsrtowcs)
{
mbstate_t state = {};
wchar_t buf[4];
const char good_chars[] = "\xf0\x9f\x90\x9e\xf0\x9f\x90\x9e";
const char bad_chars[] = "\xf0\x9f\x90\x9e\xf0\xff\x90\x9e";
const char* src;
size_t ret = 0;
// Convert normal and valid multibyte sequences.
src = good_chars;
ret = mbsrtowcs(buf, &src, 3, &state);
EXPECT_EQ(ret, 2ul);
EXPECT_EQ(buf[0], L'\U0001F41E');
EXPECT_EQ(buf[1], L'\U0001F41E');
EXPECT_EQ(buf[2], L'\0');
EXPECT_EQ(src, nullptr);
EXPECT_NE(mbsinit(&state), 0);
// Stop on invalid multibyte sequences.
src = bad_chars;
ret = mbsrtowcs(buf, &src, 3, &state);
EXPECT_EQ(ret, -1ul);
EXPECT_EQ(buf[0], L'\U0001F41E');
EXPECT_EQ(errno, EILSEQ);
EXPECT_EQ(src, bad_chars + 4);
// Valid sequence but not enough space.
src = good_chars;
ret = mbsrtowcs(buf, &src, 1, &state);
EXPECT_EQ(ret, 1ul);
EXPECT_EQ(buf[0], L'\U0001F41E');
EXPECT_EQ(src, good_chars + 4);
// Try a conversion with no destination and too short length.
src = good_chars;
ret = mbsrtowcs(nullptr, &src, 1, &state);
EXPECT_EQ(ret, 2ul);
EXPECT_EQ(src, nullptr);
EXPECT_NE(mbsinit(&state), 0);
// Try a conversion using the internal anonymous state.
src = good_chars;
ret = mbsrtowcs(buf, &src, 3, nullptr);
EXPECT_EQ(ret, 2ul);
EXPECT_EQ(buf[0], L'\U0001F41E');
EXPECT_EQ(buf[1], L'\U0001F41E');
EXPECT_EQ(buf[2], L'\0');
EXPECT_EQ(src, nullptr);
}