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LibC: Fix up mblen
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8df6955838
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2 changed files with 50 additions and 3 deletions
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@ -580,3 +580,36 @@ TEST_CASE(mbtowc)
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ret = mbtowc(nullptr, "\xe2\x84\xa2\xe2\x84\xa2", 6);
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EXPECT_EQ(ret, 3);
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}
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TEST_CASE(mblen)
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{
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int ret = 0;
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// Ensure that we can parse normal ASCII characters.
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ret = mblen("Hello", 5);
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EXPECT_EQ(ret, 1);
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// Try two three-byte codepoints (™™), only one of which should be consumed.
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ret = mblen("\xe2\x84\xa2\xe2\x84\xa2", 6);
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EXPECT_EQ(ret, 3);
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// Try a null character, which should return 0.
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ret = mblen("\x00\x00", 2);
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EXPECT_EQ(ret, 0);
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// Try an incomplete multibyte character.
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ret = mblen("\xe2\x84", 2);
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EXPECT_EQ(ret, -1);
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EXPECT_EQ(errno, EILSEQ);
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// Ask if we support shift states and reset the internal state in the process.
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ret = mblen(nullptr, 2);
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EXPECT_EQ(ret, 0); // We don't support shift states.
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ret = mblen("\x00", 1);
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EXPECT_EQ(ret, 0); // No error likely means that the state is working again.
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// Try an invalid multibyte sequence.
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ret = mblen("\xff", 1);
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EXPECT_EQ(ret, -1);
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EXPECT_EQ(errno, EILSEQ);
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}
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