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+.Dd January 15 2024
+.Dt U8LEN 3
+.Os
+.Sh NAME
+.Nm u8len
+.Nd count Unicode codepoints
+.Sh LIBRARY
+.Lb librune
+.Sh SYNOPSIS
+.In utf8.h
+.Ft size_t
+.Fn u8len "const char8_t *s" "size_t n"
+.Sh DESCRIPTION
+The
+.Fn u8len
+function returns the number of UTF-8 encoded Unicode codepoints in the
+buffer
+.Fa s
+of length
+.Fa n
+bytes.
+.Pp
+This function assumes that
+.Fa s
+contains only valid UTF-8.
+.Sh RETURN VALUES
+The
+.Fn u8len
+function returns the number of codepoints in the buffer
+.Fa s .
+.Sh EXAMPLES
+The following call to
+.Fn u8len
+will return 17 while the call to
+.Fn strlen
+will return 22 as a result of use of multibyte-characters in
+.Fa s .
+.Bd -literal -offset indent
+char8_t s[] = u8\(dq„Der Große Duden“\(dq;
+size_t blen, cplen;
+
+blen = strlen((char *)s);
+cplen = u8len(s, sizeof(s) - 1);
+.Ed
+.Sh SEE ALSO
+.Xr u8glen 3 ,
+.Xr u8wdth 3 ,
+.Xr unicode 7 ,
+.Xr utf\-8 7
+.Sh STANDARDS
+.Rs
+.%A F. Yergeau
+.%D November 2003
+.%R RFC 3629
+.%T UTF-8, a transformation format of ISO 10646
+.Re
+.Sh AUTHORS
+.An Thomas Voss Aq Mt mail@thomasvoss.com
+.Sh CAVEATS
+The return value of
+.Fn u8len
+does not necessarily represent the number of human-preceived characters
+in the given buffer;
+multiple codepoints may combine to form one human-preceived character
+that spans a single column.
+To count user-preceived codepoints
+.Pq also known as graphemes ,
+you may want to use the
+.Xr u8glen 3
+function.