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/*
* Netris -- A free networked version of T*tris
* Copyright (C) 1994,1995,1996 Mark H. Weaver <mhw@netris.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* 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.
*
* $Id: robot.c,v 1.8 1996/02/09 08:22:15 mhw Exp $
*/
#include "netris.h"
#include <unistd.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <stdarg.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
static MyEventType RobotGenFunc(EventGenRec *gen, MyEvent *event);
static EventGenRec robotGen =
{ NULL, 0, FT_read, -1, RobotGenFunc, EM_robot };
static int robotProcess;
static FILE *toRobot;
static int toRobotFd, fromRobotFd;
static char robotBuf[128];
static int robotBufSize, robotBufMsg;
static int gotSigPipe;
ExtFunc void InitRobot(char *robotProg)
{
int to[2], from[2];
int status;
MyEvent event;
signal(SIGPIPE, CatchPipe);
AtExit(CloseRobot);
if (pipe(to) || pipe(from))
die("pipe");
robotProcess = fork();
if (robotProcess < 0)
die("fork");
if (robotProcess == 0) {
dup2(to[0], STDIN_FILENO);
dup2(from[1], STDOUT_FILENO);
close(to[0]);
close(to[1]);
close(from[0]);
close(from[1]);
execl("/bin/sh", "sh", "-c", robotProg, NULL);
die("execl failed");
}
close(to[0]);
close(from[1]);
toRobotFd = to[1];
robotGen.fd = fromRobotFd = from[0];
if (!(toRobot = fdopen(toRobotFd, "w")))
die("fdopen");
if ((status = fcntl(fromRobotFd, F_GETFL, 0)) < 0)
die("fcntl/F_GETFL");
status |= O_NONBLOCK;
if (fcntl(fromRobotFd, F_SETFL, status) < 0)
die("fcntl/F_SETFL");
AddEventGen(&robotGen);
RobotCmd(1, "Version %d\n", ROBOT_VERSION);
if (WaitMyEvent(&event, EM_robot) != E_robot)
fatal("Robot didn't start successfully");
if (1 > sscanf(event.u.robot.data, "Version %d", &robotVersion)
|| robotVersion < 1)
fatal("Invalid Version line from robot");
if (robotVersion > ROBOT_VERSION)
robotVersion = ROBOT_VERSION;
}
ExtFunc void CatchPipe(int sig)
{
robotGen.ready = gotSigPipe = 1;
}
ExtFunc void RobotCmd(int flush, char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vfprintf(toRobot, fmt, args);
va_end(args);
if (flush)
fflush(toRobot);
}
ExtFunc void RobotTimeStamp(void)
{
RobotCmd(1, "TimeStamp %.3f\n", CurTimeval() / 1.0e6);
}
ExtFunc void CloseRobot(void)
{
RemoveEventGen(&robotGen);
if (robotProcess > 0)
RobotCmd(1, "Exit\n");
fclose(toRobot);
close(fromRobotFd);
}
static MyEventType RobotGenFunc(EventGenRec *gen, MyEvent *event)
{
static int more;
int result, i;
char *p;
if (gotSigPipe) {
gotSigPipe = 0;
robotGen.ready = more;
return E_lostRobot;
}
if (robotBufMsg > 0) {
/*
* Grrrrrr! SunOS 4.1 doesn't have memmove (or atexit)
* I'm told some others have a broken memmove
*
* memmove(robotBuf, robotBuf + robotBufMsg,
* robotBufSize - robotBufMsg);
*/
for (i = robotBufMsg; i < robotBufSize; ++i)
robotBuf[i - robotBufMsg] = robotBuf[i];
robotBufSize -= robotBufMsg;
robotBufMsg = 0;
}
if (more)
more = 0;
else {
do {
result = read(fromRobotFd, robotBuf + robotBufSize,
sizeof(robotBuf) - robotBufSize);
} while (result < 0 && errno == EINTR);
if (result <= 0)
return E_lostRobot;
robotBufSize += result;
}
if (!(p = memchr(robotBuf, '\n', robotBufSize))) {
if (robotBufSize >= sizeof(robotBuf))
fatal("Line from robot is too long");
return E_none;
}
*p = 0;
robotBufMsg = p - robotBuf + 1;
robotGen.ready = more = (memchr(robotBuf + robotBufMsg, '\n',
robotBufSize - robotBufMsg) != NULL);
event->u.robot.size = p - robotBuf;
event->u.robot.data = robotBuf;
return E_robot;
}
/*
* vi: ts=4 ai
* vim: noai si
*/
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