Bit-handling error affecting display of U+0400 to U+07FF #2

dsalt commented 2024年06月15日 18:31:16 +02:00

The error is in a comparison which checks for <= 0x3FF instead of <= 0x7FF (or < 0x800). This causes code points U+0400 to U+07FF to be encoded incorrectly, resulting in invalid UTF-8 sequences.

Example:

$ ./unicode U+0400
U+0400: CYRILLIC CAPITAL LETTER IE WITH GRAVE
 Character: ���
 Category: Letter, Uppercase
 Text direction: Left-to-Right
 Decomposition: Composition of U+415 and U+0300
 Lowercase equivalent: U+0450

This is fixed in dsalt/Unicode@2a60b63dfb (see #1).

The error is in a comparison which checks for `<= 0x3FF` instead of `<= 0x7FF` (or `< 0x800`). This causes code points U+0400 to U+07FF to be encoded incorrectly, resulting in invalid UTF-8 sequences. Example: ``` $ ./unicode U+0400 U+0400: CYRILLIC CAPITAL LETTER IE WITH GRAVE Character: ��� Category: Letter, Uppercase Text direction: Left-to-Right Decomposition: Composition of U+415 and U+0300 Lowercase equivalent: U+0450 ``` This is fixed in dsalt/Unicode@2a60b63dfb67e2c9111e422ecbfd85f5468b8d82 (see #1).