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早期freebsd实现

SunOS 4.1.X curses is broken.  It occasionally repaints the wrong thing
on the screen, and nobody has been able to figure out a workaround other
than to rewrite curscr every time stdscr is modified.  This, obviously,
trashes performance.  A test program is attached.

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/*
 * Compile with: 
 * /usr/5bin/cc -DSYSV_CURSES curse.c -lcurses
 *
 * Broken on: SunOS virtual61 4.1.3C 8 sun4m
 *
 * The broken behavior can be seen in that the line is first displayed,
 * then redisplayed, with a missing the 'r' from the word "different",
 * and then redisplayed correctly.
 */
#include <sys/types.h>

#include <curses.h>
#include <stdio.h>

#define	S1 "ing different traces, both beginning at the same time"
#define	S2 "          using different traces, both beginning at the same time"

main()
{
#ifdef SYSV_CURSES
	newterm("xterm", stdout, stdin);
#else
	initscr();
#endif
	mvaddstr(0, 0, S1);
	refresh();
	write(1, "\07", 1);
	sleep(2);
	mvaddstr(0, 0, S2);
	refresh();
	write(1, "\07", 1);
	sleep(2);
	wrefresh(curscr);
	write(1, "\07", 1);
	sleep(2);
	endwin();
}