diff options
Diffstat (limited to 'src/backend/utils/mb/wchar.c')
| -rw-r--r-- | src/backend/utils/mb/wchar.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/src/backend/utils/mb/wchar.c b/src/backend/utils/mb/wchar.c index 2f11b3aa9b0..2c6c3f3ff1c 100644 --- a/src/backend/utils/mb/wchar.c +++ b/src/backend/utils/mb/wchar.c @@ -1,7 +1,7 @@ /* * conversion functions between pg_wchar and multibyte streams. * Tatsuo Ishii - * $PostgreSQL: pgsql/src/backend/utils/mb/wchar.c,v 1.67 2008/10/27 19:37:22 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/utils/mb/wchar.c,v 1.68 2008/10/29 08:04:53 petere Exp $ * */ /* can be used in either frontend or backend */ @@ -419,6 +419,41 @@ pg_utf2wchar_with_len(const unsigned char *from, pg_wchar *to, int len) return cnt; } + +/* + * Map a Unicode code point to UTF-8. utf8string must have 4 bytes of + * space allocated. + */ +unsigned char * +unicode_to_utf8(pg_wchar c, unsigned char *utf8string) +{ + if (c <= 0x7F) + { + utf8string[0] = c; + } + else if (c <= 0x7FF) + { + utf8string[0] = 0xC0 | ((c >> 6) & 0x1F); + utf8string[1] = 0x80 | (c & 0x3F); + } + else if (c <= 0xFFFF) + { + utf8string[0] = 0xE0 | ((c >> 12) & 0x0F); + utf8string[1] = 0x80 | ((c >> 6) & 0x3F); + utf8string[2] = 0x80 | (c & 0x3F); + } + else + { + utf8string[0] = 0xF0 | ((c >> 18) & 0x07); + utf8string[1] = 0x80 | ((c >> 12) & 0x3F); + utf8string[2] = 0x80 | ((c >> 6) & 0x3F); + utf8string[3] = 0x80 | (c & 0x3F); + } + + return utf8string; +} + + /* * Return the byte length of a UTF8 character pointed to by s * |