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Clean up the includes in mg.
This does the following:
Moves all POSIX headers from sysdef.h into the individual .c files so that
each file now only includes what it needs. All headers are properly sorted.
Moves the remainder of sysdef.h to other files (mostly def.h) and deletes
sysdef.h now that it's no longer contains anything.
Tweak a comment that references sysdef.h so that it no longer does that.
ok florian@

/*	$OpenBSD: ttykbd.c,v 1.18 2015/03/19 21:22:15 bcallah Exp $	*/

/* This file is in the public domain. */

/*
 * Name:	MG 2a
 *		Terminfo keyboard driver using key files
 * Created:	22-Nov-1987 Mic Kaczmarczik (mic@emx.cc.utexas.edu)
 */

#include <sys/queue.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <term.h>

#include "def.h"
#include "kbd.h"

/*
 * Get keyboard character.  Very simple if you use keymaps and keys files.
 */

char	*keystrings[] = {NULL};

/*
 * Turn on function keys using keypad_xmit, then load a keys file, if
 * available.  The keys file is located in the same manner as the startup
 * file is, depending on what startupfile() does on your system.
 */
void
ttykeymapinit(void)
{
	char	*cp;

	/* Bind keypad function keys. */
	if (key_left)
		dobindkey(fundamental_map, "backward-char", key_left);
	if (key_right)
		dobindkey(fundamental_map, "forward-char", key_right);
	if (key_up)
		dobindkey(fundamental_map, "previous-line", key_up);
	if (key_down)
		dobindkey(fundamental_map, "next-line", key_down);
	if (key_beg)
		dobindkey(fundamental_map, "beginning-of-line", key_beg);
	else if (key_home)
		dobindkey(fundamental_map, "beginning-of-line", key_home);
	if (key_end)
		dobindkey(fundamental_map, "end-of-line", key_end);
	if (key_npage)
		dobindkey(fundamental_map, "scroll-up", key_npage);
	if (key_ppage)
		dobindkey(fundamental_map, "scroll-down", key_ppage);
	if (key_dc)
		dobindkey(fundamental_map, "delete-char", key_dc);

	if ((cp = getenv("TERM"))) {
		if (((cp = startupfile(cp)) != NULL) && (load(cp) != TRUE))
			ewprintf("Error reading key initialization file");
	}
	if (keypad_xmit)
		/* turn on keypad */
		putpad(keypad_xmit, 1);
}

/*
 * Clean up the keyboard -- called by tttidy()
 */
void
ttykeymaptidy(void)
{
	if (keypad_local)
		/* turn off keypad */
		putpad(keypad_local, 1);
}