+void read_utf8(charset_spec const *charset, long int input_chr,
+ charset_state *state,
+ void (*emit)(void *ctx, long int output), void *emitctx);
+int write_utf8(charset_spec const *charset, long int input_chr,
+ charset_state *state,
+ void (*emit)(void *ctx, long int output),
+ void *emitctx);
+