diff options
| author | Jeff Davis | 2024-03-07 19:15:06 +0000 |
|---|---|---|
| committer | Jeff Davis | 2024-03-07 19:15:06 +0000 |
| commit | 5c40364dd6d9c6a260c8965dffe2e066642d6f79 (patch) | |
| tree | 229ba6adf17935fe7f54f6cca3c3856267302d15 /src/include/mb | |
| parent | 6d470211e54f7a617783b99b27c9d8056a890a57 (diff) | |
Unicode case mapping tables and functions.
Implements Unicode simple case mapping, in which all code points map
to exactly one other code point unconditionally.
These tables are generated from UnicodeData.txt, which is already
being used by other infrastructure in src/common/unicode. The tables
are checked into the source tree, so they only need to be regenerated
when we update the Unicode version.
In preparation for the builtin collation provider, and possibly useful
for other callers.
Discussion: https://postgr.es/m/ff4c2f2f9c8fc7ca27c1c24ae37ecaeaeaff6b53.camel%40j-davis.com
Reviewed-by: Peter Eisentraut, Daniel Verite, Jeremy Schneider
Diffstat (limited to 'src/include/mb')
| -rw-r--r-- | src/include/mb/pg_wchar.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/include/mb/pg_wchar.h b/src/include/mb/pg_wchar.h index 32e25a1a6ea..69a55b66f44 100644 --- a/src/include/mb/pg_wchar.h +++ b/src/include/mb/pg_wchar.h @@ -555,6 +555,21 @@ surrogate_pair_to_codepoint(pg_wchar first, pg_wchar second) return ((first & 0x3FF) << 10) + 0x10000 + (second & 0x3FF); } +/* + * Number of bytes needed to represent the given char in UTF8. + */ +static inline int +unicode_utf8len(pg_wchar c) +{ + if (c <= 0x7F) + return 1; + else if (c <= 0x7FF) + return 2; + else if (c <= 0xFFFF) + return 3; + else + return 4; +} /* * The functions in this list are exported by libpq, and we need to be sure |