+When \fIwc\fP is not a null pointer,
+\fBgetcchar\fP returns \fBOK\fP upon successful completion,
+and \fBERR\fP otherwise.
+.PP
+Upon successful completion, \fBsetcchar\fP returns \fBOK\fP.
+Otherwise, it returns \fBERR\fP.
+.SH NOTES
+The \fIwch\fP argument may be a value generated by a call to
+\fBsetcchar\fP or by a function that has a \fBcchar_t\fP output argument.
+If \fIwch\fP is constructed by any other means, the effect is unspecified.
+.SH EXTENSIONS