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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.