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+.Dd January 18 2024
+.Dt U8SET 3
+.Os
+.Sh NAME
+.Nm rtou8 ,
+.Nm u8set
+.Nd encode a rune to UTF-8
+.Sh LIBRARY
+.Lb librune
+.Sh SYNOPSIS
+.In utf8.h
+.Ft int
+.Fn rtou8 "const char8_t *s" "rune ch" "size_t n"
+.Ft size_t
+.Fn u8set "const char8_t *s" "rune ch" "size_t n"
+.Sh DESCRIPTION
+The
+.Fn rtou8
+function writes the rune
+.Fa ch
+to the UTF-8 encoded buffer
+.Fa s
+of length
+.Fa n ,
+returning the number of bytes required to UTF-8 encode
+.Fa ch .
+.Pp
+The
+.Fn u8set
+function fills the buffer
+.Fa s
+of length
+.Fa n
+with the constant rune
+.Fa ch .
+It is similar to the
+.Fn rtou8
+function,
+but writes more than 1 rune if the given buffer has the capacity.
+Unlike
+.Fn rtou8 ,
+this function returns the number of bytes that were successfully written
+to
+.Fa s .
+If
+.Fa n
+is a multiple of
+.Fn u8wdth ch
+the return value will be equal to
+.Fa n ,
+however in the case that
+.Fa n
+is not a multiple then
+.Fa s
+is filled as much as possible,
+and a count shorter than
+.Fa n
+is returned.
+.Pp
+Both of these functions assume the input is valid UTF-8.
+.Sh RETURN VALUES
+The
+.Fn rtou8
+function returns the number of bytes required to write
+.Fa ch
+to the buffer
+.Fa s .
+.Pp
+The
+.Fn u8set
+function returns the number of bytes written to the buffer
+.Fa s .
+.Sh EXAMPLES
+The following calls to
+.Fn rtou8
+and
+.Fn u8set
+fill a buffer with box-drawing characters to create a top-row of a box.
+.Bd -literal -offset indent
+#define SCREEN_WIDTH 80
+
+int bdr_wdth = u8wdth(U'─'); /* box-drawing rune width */
+size_t bufsiz = SCREEN_WIDTH * bdr_wdth;
+char8_t *s = malloc(bufsiz);
+
+rtou8(s, U'┌', bdr_wdth);
+u8set(s + bdr_wdth, U'─', bufsiz - bdr_wdth * 2);
+rtou8(s + bufsiz - bdr_wdth, U'┐', bdr_wdth);
+.Ed
+.Sh SEE ALSO
+.Xr u8tor 3 ,
+.Xr u8tor_uc 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