Chinese GB2312 characters has a wild card @samp{*} in the @var{family}
field.
+@defun set-fontset-font name character fontname &optional frame
+This function modifies the existing fontset @var{name} to
+use the font name @var{fontname} for the character @var{character}.
+
+If @var{name} is nil, this function modifies the default
+fontset of which short name is "fontset-default".
+
+@var{character} may be a cons; @samp{(@var{from}
+. @var{to})}, where @var{from} and @var{to} are non-generic
+characters. In that case, use @var{fontname} for all
+characters in the range @var{from} and @var{to} (inclusive).
+
+@var{character} may be a charset. In that case, use
+@var{fontname} for all character in the charsets.
+
+@var{fontname} may be a cons; @samp{(@var{family}
+. @var{registry})}, where @var{family} is a family name of a
+font (possibly including a foundry name at the head),
+@var{registry} is a registry name of a font (possibly
+including an encoding name at the tail).
+
+For instance, this changes the default fontset to use a font
+of which registry name is "JISX0208.1983" for all characters
+belonging to the charset `japanese-jisx0208'.
+
+@example
+(set-fontset-font nil 'japanese-jisx0208 '(nil . "JISX0208.1983"))
+@end example
+
+@end defun
+
@defun char-displayable-p char
This function returns @code{t} if Emacs ought to be able to display
@var{char}. More precisely, if the selected frame's fontset has a