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Add the order keyword to systat global command interpreter.
This command shows the available orderings for the current view, which
ordering is active, their shortcuts, and if they're in reverse order.

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/* $Id: engine.h,v 1.9 2018/02/08 07:00:33 martijn Exp $	 */
/*
 * Copyright (c) 2001, 2007 Can Erkin Acar <canacar@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _ENGINE_H_
#define _ENGINE_H_

#include <curses.h>

#define DEFAULT_WIDTH  80
#define DEFAULT_HEIGHT 25

/* XXX do not hardcode! */
#define HEADER_LINES 4


#define CTRL_A  1
#define CTRL_B  2
#define CTRL_E  5
#define CTRL_F  6
#define CTRL_G  7
#define CTRL_H  8
#define CTRL_L  12
#define CTRL_N  14
#define CTRL_P  16
#define CTRL_V  22

#define META_V  246

#define MAX_LINE_BUF 1024


#define FLD_ALIGN_LEFT   0
#define FLD_ALIGN_RIGHT  1
#define FLD_ALIGN_CENTER 2
#define FLD_ALIGN_COLUMN 3
#define FLD_ALIGN_BAR    4

#define FLD_FLAG_HIDDEN 1


typedef struct {
	char *title;
	int norm_width;
	int max_width;
	int increment;
	int align;
	int start;
	int width;
	unsigned flags;
	int arg;
} field_def;

typedef struct {
	char *name;
	char *match;
	int hotkey;
	int (*func) (const void *, const void *);
} order_type;

struct view_manager {
	char *name;
	int  (*select_fn) (void);
	int  (*read_fn)   (void);
	void (*sort_fn)   (void);
	int  (*header_fn) (void);
	void (*print_fn)  (void);
	int  (*key_fn)    (int);
	order_type *order_list;
	order_type *order_curr;
};

typedef struct {
	field_def **view;
	char *name;
	int hotkey;
	struct view_manager *mgr;
} field_view;

struct command {
	char *prompt;
	void ( *exec)(const char *);
};


void tb_start(void);

void tb_end(void);

int tbprintf(char *format, ...) GCC_PRINTFLIKE(1,2);
int tbprintft(char *format, ...) GCC_PRINTFLIKE(1,2);

void end_line(void);
void end_page(void);

void print_fld_str(field_def *, const char *);
void print_fld_age(field_def *, unsigned int);
void print_fld_sdiv(field_def *, u_int64_t, int);
void print_fld_size(field_def *, u_int64_t);
void print_fld_ssdiv(field_def *, int64_t, int);
void print_fld_ssize(field_def *, int64_t);
void print_fld_bw(field_def *, double);
void print_fld_rate(field_def *, double);
void print_fld_uint(field_def *, unsigned int);
void print_fld_float(field_def *, double, int);
void print_fld_bar(field_def *, int);
void print_fld_tb(field_def *);

void print_title(void);

void hide_field(field_def *fld);
void show_field(field_def *fld);
void field_setup(void);

void add_view(field_view *fv);
int set_view(const char *opt);
void next_view(void);
void prev_view(void);

int foreach_order(void (*callback)(order_type *));
void set_order(const char *opt);
void next_order(void);

void setup_term(int maxpr);
int check_termcap(void);

void engine_initialize(void);
void engine_loop(int countmax);

struct command *command_set(struct command *cmd, const char *init);
const char *message_set(const char *msg);

void foreach_view(void (*callback)(field_view *));

extern int sortdir;
extern useconds_t udelay;
extern int dispstart;
extern int interactive;
extern int averageonly;
extern int maxprint;
extern int paused;
extern int rawmode;
extern int rawwidth;
extern int columns, lines;

extern int need_update;
extern int need_sort;
extern int separate_thousands;

extern volatile sig_atomic_t gotsig_close;
extern volatile sig_atomic_t gotsig_resize;
extern volatile sig_atomic_t gotsig_alarm;

extern field_view *curr_view;
extern struct view_manager *curr_mgr;

extern char tmp_buf[MAX_LINE_BUF];

extern int curr_line; /* XXX temp */
extern u_int32_t num_disp;
#endif