void#if EXTERNALPIPEIN_PATCHextpipe(const Arg *arg, int in)#elseexternalpipe(const Arg *arg)#endif // EXTERNALPIPEIN_PATCH{	int to[2];	char buf[UTF_SIZ];	void (*oldsigpipe)(int);	Glyph *bp, *end;	int lastpos, n, newline; 	if (pipe(to) == -1)		return; 	switch (fork()) {	case -1:		close(to[0]);		close(to[1]);		return;	case 0:		dup2(to[0], STDIN_FILENO);		close(to[0]);		close(to[1]);		#if EXTERNALPIPEIN_PATCH		if (in)			dup2(csdfd, STDOUT_FILENO);		close(csdfd);		#endif // EXTERNALPIPEIN_PATCH		execvp(((char **)arg->v)[0], (char **)arg->v);		fprintf(stderr, "st: execvp %s\n", ((char **)arg->v)[0]);		perror("failed");		exit(0);	} 	close(to[0]);	/* ignore sigpipe for now, in case child exists early */	oldsigpipe = signal(SIGPIPE, SIG_IGN);	newline = 0;	for (n = 0; n < term.row; n++) {		bp = term.line[n];		#if REFLOW_PATCH		lastpos = MIN(tlinelen(TLINE(n)) + 1, term.col) - 1;		#else		lastpos = MIN(tlinelen(n) + 1, term.col) - 1;		#endif // REFLOW_PATCH		if (lastpos < 0)			break;		end = &bp[lastpos + 1];		for (; bp < end; ++bp)			if (xwrite(to[1], buf, utf8encode(bp->u, buf)) < 0)				break;		if ((newline = term.line[n][lastpos].mode & ATTR_WRAP))			continue;		if (xwrite(to[1], "\n", 1) < 0)			break;		newline = 0;	}	if (newline)		(void)xwrite(to[1], "\n", 1);	close(to[1]);	/* restore */	signal(SIGPIPE, oldsigpipe);} #if EXTERNALPIPEIN_PATCHvoidexternalpipe(const Arg *arg) {	extpipe(arg, 0);} voidexternalpipein(const Arg *arg) {	extpipe(arg, 1);}#endif // EXTERNALPIPEIN_PATCH