#define KEY_COL(sp, ch)							\
	(INTISWIDE(ch) ? CHAR_WIDTH(sp, ch) ? CHAR_WIDTH(sp, ch) : 	\
					      1 : /* extra space */	\
			 KEY_LEN(sp,ch))

struct _conv_win {
    void    *bp1;
    size_t   blen1;
};

typedef int (*char2wchar_t) 
    (SCR *, const char *, ssize_t, struct _conv_win *, size_t *, CHAR_T **);
typedef int (*wchar2char_t) 
    (SCR *, const CHAR_T *, ssize_t, struct _conv_win *, size_t *, char **);

struct _conv {
	char2wchar_t	sys2int;
	wchar2char_t	int2sys;
	char2wchar_t	file2int;
	wchar2char_t	int2file;
	char2wchar_t	input2int;
	wchar2char_t	int2disp;
};