/*  *	HT Editor *	event.cc * *	Copyright (C) 1999-2004 Stefan Weyergraf (stefan@weyergraf.de) * *	This program is free software; you can redistribute it and/or modify *	it under the terms of the GNU General Public License version 2 as *	published by the Free Software Foundation. * *	This program is distributed in the hope that it will be useful, *	but WITHOUT ANY WARRANTY; without even the implied warranty of *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *	GNU General Public License for more details. * *	You should have received a copy of the GNU General Public License *	along with this program; if not, write to the Free Software *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */#include <string.h>#include <sys/select.h>#include <sys/time.h>#include <sys/types.h>#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include "io/display.h"#include "io/event.h"struct fd_listener {	int fd;	int fd_flags;};#define	MAX_FD_LISTENERS	32static fd_listener fd_listener[MAX_FD_LISTENERS];static int fd_listeners = 0;static fd_set grfds, gwfds, gxfds;static int g_highest_fd = 0;static bool gTranslateKeys = true;bool sys_next_event(sys_event_t &event, int wait_usec){	if (sys_get_winch_flag()) {		sys_set_winch_flag(false);		if (sys_get_screen_size(event.screen_resize.w, event.screen_resize.h)) {			event.type = SYSEV_SCREEN_RESIZE;			return true;		}	}	fd_set rfds = grfds, wfds = gwfds, xfds = gxfds;	timeval t;	t.tv_sec = 0;	t.tv_usec = wait_usec;	int e = select(g_highest_fd+1, &rfds, &wfds, &xfds, &t);	if (e > 0) {		if (FD_ISSET(0, &rfds)) {			if (gTranslateKeys) {				return keyb_getevent(event);			} else {				event.type = SYSEV_FD_EVENT;				event.fd_event.fd = 0;				event.fd_event.fd_flags = FD_FLAG_READABLE;				return true;			}		} else {			for (int i=0; i<fd_listeners; i++) {				int fl = 0;				fl |= ((fd_listener[i].fd_flags & FD_FLAG_READABLE) &&				FD_ISSET(fd_listener[i].fd, &rfds)) ? FD_FLAG_READABLE : 0;				fl |= ((fd_listener[i].fd_flags & FD_FLAG_WRITABLE) &&				FD_ISSET(fd_listener[i].fd, &wfds)) ? FD_FLAG_WRITABLE : 0;				fl |= ((fd_listener[i].fd_flags & FD_FLAG_EXCEPTION) &&				FD_ISSET(fd_listener[i].fd, &xfds)) ? FD_FLAG_EXCEPTION : 0;				if (fl) {					event.type = SYSEV_FD_EVENT;					event.fd_event.fd = fd_listener[i].fd;					event.fd_event.fd_flags = fl;					return true;				}			}		}		// should not happen !		fprintf(stderr, "argh: %s:%d", __FILE__, __LINE__);		exit(1);	}	return false;}static void updateFDSets(){	FD_ZERO(&grfds);	FD_ZERO(&gwfds);	FD_ZERO(&gxfds);	g_highest_fd = 0;	for (int i=0; i<fd_listeners; i++) {		if (fd_listener[i].fd > g_highest_fd) g_highest_fd = fd_listener[i].fd;		if (fd_listener[i].fd_flags & FD_FLAG_READABLE)			FD_SET(fd_listener[i].fd, &grfds);		if (fd_listener[i].fd_flags & FD_FLAG_WRITABLE)			FD_SET(fd_listener[i].fd, &gwfds);		if (fd_listener[i].fd_flags & FD_FLAG_EXCEPTION)			FD_SET(fd_listener[i].fd, &gxfds);	}	// always listen on stdin	FD_SET(0, &grfds);}bool sys_listen_fd_event(int fd, int fd_flags){	if (fd_listeners == MAX_FD_LISTENERS) return false;	for (int i=0; i<fd_listeners; i++) {		// already listening to fd ?		if (fd_listener[i].fd == fd) return false;	}	fd_listener[fd_listeners].fd = fd;	fd_listener[fd_listeners].fd_flags = fd_flags;	fd_listeners++;	updateFDSets();	return true;}bool sys_unlisten_fd_event(int fd){	for (int i=0; i<fd_listeners; i++) {		if (fd_listener[i].fd == fd) {			memmove(fd_listener+i, fd_listener+i+1, (fd_listeners-i-1)*sizeof fd_listener[0]);			fd_listeners--;			updateFDSets();			return true;		}	}	return false;}void sys_set_key_translation(bool translate_keys){	gTranslateKeys = translate_keys;}bool initSysEvent(){	updateFDSets();	return true;}void doneSysEvent(){}