/**
 ** SPDX-License-Identifier: BSD-4-Clause
 **
 ** Copyright (c) 1995 Michael Smith, All rights reserved.
 **
 ** Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions
 ** are met:
 ** 1. Redistributions of source code must retain the above copyright
 **    notice, this list of conditions and the following disclaimer as
 **    the first lines of this file unmodified.
 ** 2. Redistributions in binary form must reproduce the above copyright
 **    notice, this list of conditions and the following disclaimer in the
 **    documentation and/or other materials provided with the distribution.
 ** 3. All advertising materials mentioning features or use of this software
 **    must display the following acknowledgment:
 **      This product includes software developed by Michael Smith.
 ** 4. The name of the author may not be used to endorse or promote products
 **    derived from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY Michael Smith ``AS IS'' AND ANY
 ** EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 ** PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Michael Smith BE LIABLE FOR
 ** ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 ** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 ** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 ** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 ** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 ** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 ** EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 **
 **/

/**
 ** MSCONVD.C
 **
 ** Mouse protocol conversion daemon : listens to a serial port or
 ** the PS/2 mouse port for mouse data stream, decodes data and passes
 ** writes off to the uinput driver.
 **
 ** The mouse interface functions are derived closely from the mouse
 ** handler in the XFree86 X server.  Many thanks to the XFree86 people
 ** for their great work!
 **
 **/

#include <sys/param.h>
#include <sys/consio.h>
#include <sys/mouse.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/un.h>

#include <dev/evdev/input.h>
#include <dev/evdev/uinput.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <libutil.h>
#include <limits.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <termios.h>
#include <unistd.h>

/* Logitech PS2++ protocol */
#define MOUSE_PS2PLUS_CHECKBITS(b)      \
                        ((((b[2] & 0x03) << 2) | 0x02) == (b[1] & 0x0f))
#define MOUSE_PS2PLUS_PACKET_TYPE(b)    \
                        (((b[0] & 0x30) >> 2) | ((b[1] & 0x30) >> 4))

#define ChordMiddle     0x0001
#define ClearDTR        0x0004
#define ClearRTS        0x0008
#define NoPnP           0x0010

#define ID_NONE         0
#define ID_PORT         1
#define ID_IF           2
#define ID_TYPE         4
#define ID_MODEL        8
#define ID_ALL          (ID_PORT | ID_IF | ID_TYPE | ID_MODEL)

#define debug(...) do {                                         \
        if (debug && nodaemon)                                  \
                warnx(__VA_ARGS__);                             \
} while (0)

#define logerr(e, ...) do {                                     \
        log_or_warn(LOG_DAEMON | LOG_ERR, errno, __VA_ARGS__);  \
        exit(e);                                                \
} while (0)

#define logerrx(e, ...) do {                                    \
        log_or_warn(LOG_DAEMON | LOG_ERR, 0, __VA_ARGS__);      \
        exit(e);                                                \
} while (0)

#define logwarn(...)                                            \
        log_or_warn(LOG_DAEMON | LOG_WARNING, errno, __VA_ARGS__)

#define logwarnx(...)                                           \
        log_or_warn(LOG_DAEMON | LOG_WARNING, 0, __VA_ARGS__)

/* structures */

/* symbol table entry */
typedef struct {
    const char *name;
    int val;
    int val2;
} symtab_t;

/* serial PnP ID string */
typedef struct {
    int revision;       /* PnP revision, 100 for 1.00 */
    const char *eisaid; /* EISA ID including mfr ID and product ID */
    char *serial;       /* serial No, optional */
    const char *class;  /* device class, optional */
    char *compat;       /* list of compatible drivers, optional */
    char *description;  /* product description, optional */
    int neisaid;        /* length of the above fields... */
    int nserial;
    int nclass;
    int ncompat;
    int ndescription;
} pnpid_t;

/* global variables */

static int      debug = 0;
static bool     nodaemon = false;
static bool     background = false;
static bool     paused = false;
static int      identify = ID_NONE;
static const char *pidfile = "/var/run/msconvd.pid";
static struct pidfh *pfh;

/* local variables */

/* interface (the table must be ordered by MOUSE_IF_XXX in mouse.h) */
static symtab_t rifs[] = {
    { "serial",         MOUSE_IF_SERIAL,        BUS_RS232 },
    { "ps/2",           MOUSE_IF_PS2,           BUS_I8042 },
    { "sysmouse",       MOUSE_IF_SYSMOUSE,      BUS_VIRTUAL },
    { "usb",            MOUSE_IF_USB,           BUS_USB },
    { NULL,             MOUSE_IF_UNKNOWN,       0 },
};

/* types (the table must be ordered by MOUSE_PROTO_XXX in mouse.h) */
static const char *rnames[] = {
    "microsoft",
    "mousesystems",
    "logitech",
    "mmseries",
    "mouseman",
    "wasbusmouse",
    "wasinportmouse",
    "ps/2",
    "mmhitab",
    "glidepoint",
    "intellimouse",
    "thinkingmouse",
    "sysmouse",
    "x10mouseremote",
    "kidspad",
    "versapad",
    "jogdial",
#if notyet
    "mariqua",
#endif
    "gtco_digipad",
    NULL
};

/* models */
static symtab_t rmodels[] = {
    { "NetScroll",              MOUSE_MODEL_NETSCROLL,          0 },
    { "NetMouse/NetScroll Optical", MOUSE_MODEL_NET,            0 },
    { "GlidePoint",             MOUSE_MODEL_GLIDEPOINT,         0 },
    { "ThinkingMouse",          MOUSE_MODEL_THINK,              0 },
    { "IntelliMouse",           MOUSE_MODEL_INTELLI,            0 },
    { "EasyScroll/SmartScroll", MOUSE_MODEL_EASYSCROLL,         0 },
    { "MouseMan+",              MOUSE_MODEL_MOUSEMANPLUS,       0 },
    { "Kidspad",                MOUSE_MODEL_KIDSPAD,            0 },
    { "VersaPad",               MOUSE_MODEL_VERSAPAD,           0 },
    { "IntelliMouse Explorer",  MOUSE_MODEL_EXPLORER,           0 },
    { "4D Mouse",               MOUSE_MODEL_4D,                 0 },
    { "4D+ Mouse",              MOUSE_MODEL_4DPLUS,             0 },
    { "Synaptics Touchpad",     MOUSE_MODEL_SYNAPTICS,          0 },
    { "TrackPoint",             MOUSE_MODEL_TRACKPOINT,         0 },
    { "Elantech Touchpad",      MOUSE_MODEL_ELANTECH,           0 },
    { "generic",                MOUSE_MODEL_GENERIC,            0 },
    { NULL,                     MOUSE_MODEL_UNKNOWN,            0 },
};

/* PnP EISA/product IDs */
static symtab_t pnpprod[] = {
    /* Kensignton ThinkingMouse */
    { "KML0001",        MOUSE_PROTO_THINK,      MOUSE_MODEL_THINK },
    /* MS IntelliMouse */
    { "MSH0001",        MOUSE_PROTO_INTELLI,    MOUSE_MODEL_INTELLI },
    /* MS IntelliMouse TrackBall */
    { "MSH0004",        MOUSE_PROTO_INTELLI,    MOUSE_MODEL_INTELLI },
    /* Tremon Wheel Mouse MUSD */
    { "HTK0001",        MOUSE_PROTO_INTELLI,    MOUSE_MODEL_INTELLI },
    /* Genius PnP Mouse */
    { "KYE0001",        MOUSE_PROTO_MS,         MOUSE_MODEL_GENERIC },
    /* MouseSystems SmartScroll Mouse (OEM from Genius?) */
    { "KYE0002",        MOUSE_PROTO_MS,         MOUSE_MODEL_EASYSCROLL },
    /* Genius NetMouse */
    { "KYE0003",        MOUSE_PROTO_INTELLI,    MOUSE_MODEL_NET },
    /* Genius Kidspad, Easypad and other tablets */
    { "KYE0005",        MOUSE_PROTO_KIDSPAD,    MOUSE_MODEL_KIDSPAD },
    /* Genius EZScroll */
    { "KYEEZ00",        MOUSE_PROTO_MS,         MOUSE_MODEL_EASYSCROLL },
    /* Logitech Cordless MouseMan Wheel */
    { "LGI8033",        MOUSE_PROTO_INTELLI,    MOUSE_MODEL_MOUSEMANPLUS },
    /* Logitech MouseMan (new 4 button model) */
    { "LGI800C",        MOUSE_PROTO_INTELLI,    MOUSE_MODEL_MOUSEMANPLUS },
    /* Logitech MouseMan+ */
    { "LGI8050",        MOUSE_PROTO_INTELLI,    MOUSE_MODEL_MOUSEMANPLUS },
    /* Logitech FirstMouse+ */
    { "LGI8051",        MOUSE_PROTO_INTELLI,    MOUSE_MODEL_MOUSEMANPLUS },
    /* Logitech serial */
    { "LGI8001",        MOUSE_PROTO_LOGIMOUSEMAN, MOUSE_MODEL_GENERIC },
    /* A4 Tech 4D/4D+ Mouse */
    { "A4W0005",        MOUSE_PROTO_INTELLI,    MOUSE_MODEL_4D },
    /* 8D Scroll Mouse */
    { "PEC9802",        MOUSE_PROTO_INTELLI,    MOUSE_MODEL_INTELLI },
    /* Mitsumi Wireless Scroll Mouse */
    { "MTM6401",        MOUSE_PROTO_INTELLI,    MOUSE_MODEL_INTELLI },

    /* MS serial */
    { "PNP0F01",        MOUSE_PROTO_MS,         MOUSE_MODEL_GENERIC },
    /* MS PS/2 */
    { "PNP0F03",        MOUSE_PROTO_PS2,        MOUSE_MODEL_GENERIC },
    /*
     * EzScroll returns PNP0F04 in the compatible device field; but it
     * doesn't look compatible... XXX
     */
    /* MouseSystems */
    { "PNP0F04",        MOUSE_PROTO_MSC,        MOUSE_MODEL_GENERIC },
    /* MouseSystems */
    { "PNP0F05",        MOUSE_PROTO_MSC,        MOUSE_MODEL_GENERIC },
#if notyet
    /* Genius Mouse */
    { "PNP0F06",        MOUSE_PROTO_XXX,        MOUSE_MODEL_GENERIC },
    /* Genius Mouse */
    { "PNP0F07",        MOUSE_PROTO_XXX,        MOUSE_MODEL_GENERIC },
#endif
    /* Logitech serial */
    { "PNP0F08",        MOUSE_PROTO_LOGIMOUSEMAN, MOUSE_MODEL_GENERIC },
    /* MS BallPoint serial */
    { "PNP0F09",        MOUSE_PROTO_MS,         MOUSE_MODEL_GENERIC },
    /* MS PnP serial */
    { "PNP0F0A",        MOUSE_PROTO_MS,         MOUSE_MODEL_GENERIC },
    /* MS PnP BallPoint serial */
    { "PNP0F0B",        MOUSE_PROTO_MS,         MOUSE_MODEL_GENERIC },
    /* MS serial compatible */
    { "PNP0F0C",        MOUSE_PROTO_MS,         MOUSE_MODEL_GENERIC },
    /* MS PS/2 compatible */
    { "PNP0F0E",        MOUSE_PROTO_PS2,        MOUSE_MODEL_GENERIC },
    /* MS BallPoint compatible */
    { "PNP0F0F",        MOUSE_PROTO_MS,         MOUSE_MODEL_GENERIC },
#if notyet
    /* TI QuickPort */
    { "PNP0F10",        MOUSE_PROTO_XXX,        MOUSE_MODEL_GENERIC },
#endif
    /* Logitech PS/2 */
    { "PNP0F12",        MOUSE_PROTO_PS2,        MOUSE_MODEL_GENERIC },
    /* PS/2 */
    { "PNP0F13",        MOUSE_PROTO_PS2,        MOUSE_MODEL_GENERIC },
#if notyet
    /* MS Kids Mouse */
    { "PNP0F14",        MOUSE_PROTO_XXX,        MOUSE_MODEL_GENERIC },
#endif
#if notyet
    /* Logitech SWIFT */
    { "PNP0F16",        MOUSE_PROTO_XXX,        MOUSE_MODEL_GENERIC },
#endif
    /* Logitech serial compat */
    { "PNP0F17",        MOUSE_PROTO_LOGIMOUSEMAN, MOUSE_MODEL_GENERIC },
    /* Logitech PS/2 compatible */
    { "PNP0F19",        MOUSE_PROTO_PS2,        MOUSE_MODEL_GENERIC },
#if notyet
    /* Logitech SWIFT compatible */
    { "PNP0F1A",        MOUSE_PROTO_XXX,        MOUSE_MODEL_GENERIC },
    /* HP Omnibook */
    { "PNP0F1B",        MOUSE_PROTO_XXX,        MOUSE_MODEL_GENERIC },
    /* Compaq LTE TrackBall PS/2 */
    { "PNP0F1C",        MOUSE_PROTO_XXX,        MOUSE_MODEL_GENERIC },
    /* Compaq LTE TrackBall serial */
    { "PNP0F1D",        MOUSE_PROTO_XXX,        MOUSE_MODEL_GENERIC },
    /* MS Kidts Trackball */
    { "PNP0F1E",        MOUSE_PROTO_XXX,        MOUSE_MODEL_GENERIC },
#endif
    /* Interlink VersaPad */
    { "LNK0001",        MOUSE_PROTO_VERSAPAD,   MOUSE_MODEL_VERSAPAD },

    { NULL,             MOUSE_PROTO_UNKNOWN,    MOUSE_MODEL_GENERIC },
};

/* the table must be ordered by MOUSE_PROTO_XXX in mouse.h */
static unsigned short rodentcflags[] =
{
    (CS7                   | CREAD | CLOCAL | HUPCL),   /* MicroSoft */
    (CS8 | CSTOPB          | CREAD | CLOCAL | HUPCL),   /* MouseSystems */
    (CS8 | CSTOPB          | CREAD | CLOCAL | HUPCL),   /* Logitech */
    (CS8 | PARENB | PARODD | CREAD | CLOCAL | HUPCL),   /* MMSeries */
    (CS7                   | CREAD | CLOCAL | HUPCL),   /* MouseMan */
    0,                                                  /* Bus */
    0,                                                  /* InPort */
    0,                                                  /* PS/2 */
    (CS8                   | CREAD | CLOCAL | HUPCL),   /* MM HitTablet */
    (CS7                   | CREAD | CLOCAL | HUPCL),   /* GlidePoint */
    (CS7                   | CREAD | CLOCAL | HUPCL),   /* IntelliMouse */
    (CS7                   | CREAD | CLOCAL | HUPCL),   /* Thinking Mouse */
    (CS8 | CSTOPB          | CREAD | CLOCAL | HUPCL),   /* sysmouse */
    (CS7                   | CREAD | CLOCAL | HUPCL),   /* X10 MouseRemote */
    (CS8 | PARENB | PARODD | CREAD | CLOCAL | HUPCL),   /* kidspad etc. */
    (CS8                   | CREAD | CLOCAL | HUPCL),   /* VersaPad */
    0,                                                  /* JogDial */
#if notyet
    (CS8 | CSTOPB          | CREAD | CLOCAL | HUPCL),   /* Mariqua */
#endif
    (CS8                   | CREAD |          HUPCL ),  /* GTCO Digi-Pad */
};

/* evdev button codes */
static const int16_t evdev_buttons[8] = {
        BTN_LEFT,
        BTN_MIDDLE,
        BTN_RIGHT,
        BTN_SIDE,
        BTN_EXTRA,
        BTN_FORWARD,
        BTN_BACK,
        BTN_TASK
};

static struct rodentparam {
    int flags;
    const char *portname;       /* /dev/XXX */
    int rtype;                  /* MOUSE_PROTO_XXX */
    int level;                  /* operation level: 0 or greater */
    int baudrate;
    int rate;                   /* report rate */
    int resolution;             /* MOUSE_RES_XXX or a positive number */
    int mfd;                    /* mouse file descriptor */
    int ufd;                    /* /dev/uinput file descriptor */
    int mremsfd;                /* mouse remote server file descriptor */
    int mremcfd;                /* mouse remote client file descriptor */
    int is_removable;           /* set if device is removable, like USB */
    mousehw_t hw;               /* mouse device hardware information */
    mousemode_t mode;           /* protocol information */
} rodent = {
    .flags = 0,
    .portname = NULL,
    .rtype = MOUSE_PROTO_UNKNOWN,
    .level = -1,
    .baudrate = 1200,
    .rate = 0,
    .resolution = MOUSE_RES_UNKNOWN,
    .mfd = -1,
    .ufd = -1,
    .mremsfd = -1,
    .mremcfd = -1,
    .is_removable = 0,
};

static jmp_buf env;

/* function prototypes */

static void     msconvd(void);
static void     hup(int sig);
static void     cleanup(int sig);
static void     pause_mouse(int sig);
static void     usage(void);
static void     log_or_warn(int log_pri, int errnum, const char *fmt, ...)
                    __printflike(3, 4);

static int      r_uinput_register(void);
static int      r_uinput_report(int fd, mousestatus_t *act);
static int      r_identify(void);
static const char *r_if(int type);
static uint16_t r_bustype(int type);
static const char *r_name(int type);
static const char *r_model(int model);
static void     r_init(void);
static int      r_protocol(u_char b, mousestatus_t *act);
static void     setmousespeed(int old, int new, unsigned cflag);

static bool     pnpwakeup1(void);
static bool     pnpwakeup2(void);
static int      pnpgets(char *buf);
static bool     pnpparse(pnpid_t *id, char *buf, int len);
static symtab_t *pnpproto(pnpid_t *id);

static symtab_t *gettoken(symtab_t *tab, const char *s, int len);
static const char *gettokenname(symtab_t *tab, int val);
static int      gettokenval2(symtab_t *tab, int val);

static void     mremote_serversetup(void);
static void     mremote_clientchg(bool add);

static int      kidspad(u_char rxc, mousestatus_t *act);
static int      gtco_digipad(u_char, mousestatus_t *);

int
main(int argc, char *argv[])
{
    int c;
    int i;

    while ((c = getopt(argc, argv, "DF:I:PRS:cdfhi:l:p:r:st:")) != -1)
        switch(c) {

        case 'c':
            rodent.flags |= ChordMiddle;
            break;

        case 'd':
            ++debug;
            break;

        case 'f':
            nodaemon = true;
            break;

        case 'i':
            if (strcmp(optarg, "all") == 0)
                identify = ID_ALL;
            else if (strcmp(optarg, "port") == 0)
                identify = ID_PORT;
            else if (strcmp(optarg, "if") == 0)
                identify = ID_IF;
            else if (strcmp(optarg, "type") == 0)
                identify = ID_TYPE;
            else if (strcmp(optarg, "model") == 0)
                identify = ID_MODEL;
            else {
                warnx("invalid argument `%s'", optarg);
                usage();
            }
            nodaemon = true;
            break;

        case 'l':
            rodent.level = atoi(optarg);
            if ((rodent.level < 0) || (rodent.level > 4)) {
                warnx("invalid argument `%s'", optarg);
                usage();
            }
            break;

        case 'p':
            rodent.portname = optarg;
            break;

        case 'r':
            if (strcmp(optarg, "high") == 0)
                rodent.resolution = MOUSE_RES_HIGH;
            else if (strcmp(optarg, "medium-high") == 0)
                rodent.resolution = MOUSE_RES_HIGH;
            else if (strcmp(optarg, "medium-low") == 0)
                rodent.resolution = MOUSE_RES_MEDIUMLOW;
            else if (strcmp(optarg, "low") == 0)
                rodent.resolution = MOUSE_RES_LOW;
            else if (strcmp(optarg, "default") == 0)
                rodent.resolution = MOUSE_RES_DEFAULT;
            else {
                rodent.resolution = atoi(optarg);
                if (rodent.resolution <= 0) {
                    warnx("invalid argument `%s'", optarg);
                    usage();
                }
            }
            break;

        case 's':
            rodent.baudrate = 9600;
            break;

        case 'D':
            rodent.flags |= ClearDTR;
            break;

        case 'F':
            rodent.rate = atoi(optarg);
            if (rodent.rate <= 0) {
                warnx("invalid argument `%s'", optarg);
                usage();
            }
            break;

        case 'I':
            pidfile = optarg;
            break;

        case 'P':
            rodent.flags |= NoPnP;
            break;

        case 'R':
            rodent.flags |= ClearRTS;
            break;

        case 'S':
            rodent.baudrate = atoi(optarg);
            if (rodent.baudrate <= 0) {
                warnx("invalid argument `%s'", optarg);
                usage();
            }
            debug("rodent baudrate %d", rodent.baudrate);
            break;

        case 't':
            if (strcmp(optarg, "auto") == 0) {
                rodent.rtype = MOUSE_PROTO_UNKNOWN;
                rodent.flags &= ~NoPnP;
                rodent.level = -1;
                break;
            }
            for (i = 0; rnames[i] != NULL; i++)
                if (strcmp(optarg, rnames[i]) == 0) {
                    rodent.rtype = i;
                    rodent.flags |= NoPnP;
                    rodent.level = (i == MOUSE_PROTO_SYSMOUSE) ? 1 : 0;
                    break;
                }
            if (rnames[i] == NULL) {
                warnx("no such mouse type `%s'", optarg);
                usage();
            }
            break;

        case 'h':
        case '?':
        default:
            usage();
        }

    /* the default port name */
    switch(rodent.rtype) {

    case MOUSE_PROTO_PS2:
        if (!rodent.portname)
            rodent.portname = "/dev/psm0";
        break;

    default:
        if (rodent.portname)
            break;
        warnx("no port name specified");
        usage();
    }

    if (strncmp(rodent.portname, "/dev/ums", 8) == 0)
        rodent.is_removable = 1;

    for (;;) {
        if (setjmp(env) == 0) {
            signal(SIGHUP, hup);
            signal(SIGINT , cleanup);
            signal(SIGQUIT, cleanup);
            signal(SIGTERM, cleanup);
            signal(SIGUSR1, pause_mouse);

            rodent.mfd = open(rodent.portname, O_RDWR | O_NONBLOCK);
            if (rodent.mfd == -1)
                logerr(1, "unable to open %s", rodent.portname);
            if (r_identify() == MOUSE_PROTO_UNKNOWN) {
                logwarnx("cannot determine mouse type on %s", rodent.portname);
                close(rodent.mfd);
                rodent.mfd = -1;
            }

            /* print some information */
            if (identify != ID_NONE) {
                if (identify == ID_ALL)
                    printf("%s %s %s %s\n",
                        rodent.portname, r_if(rodent.hw.iftype),
                        r_name(rodent.rtype), r_model(rodent.hw.model));
                else if (identify & ID_PORT)
                    printf("%s\n", rodent.portname);
                else if (identify & ID_IF)
                    printf("%s\n", r_if(rodent.hw.iftype));
                else if (identify & ID_TYPE)
                    printf("%s\n", r_name(rodent.rtype));
                else if (identify & ID_MODEL)
                    printf("%s\n", r_model(rodent.hw.model));
                exit(0);
            } else {
                debug("port: %s  interface: %s  type: %s  model: %s",
                    rodent.portname, r_if(rodent.hw.iftype),
                    r_name(rodent.rtype), r_model(rodent.hw.model));
            }

            if (rodent.mfd == -1) {
                /*
                 * We cannot continue because of error.  Exit if the
                 * program has not become a daemon.  Otherwise, block
                 * until the user corrects the problem and issues SIGHUP.
                 */
                if (!background)
                    exit(1);
                sigpause(0);
            }

            r_init();                   /* call init function */
            msconvd();
        }

        if (rodent.mfd != -1)
            close(rodent.mfd);
        if (rodent.ufd != -1)
            close(rodent.ufd);
        rodent.mfd = rodent.ufd = -1;
        if (rodent.is_removable)
                exit(0);
    }
    /* NOT REACHED */

    exit(0);
}

static void
msconvd(void)
{
    mousestatus_t action;               /* mouse action */
    fd_set fds;
    u_char b;
    pid_t mpid;
    int flags;
    int c;

    if ((rodent.ufd = r_uinput_register()) == -1)
        logerr(1, "cannot register uinput device");

    if (!nodaemon && !background) {
        pfh = pidfile_open(pidfile, 0600, &mpid);
        if (pfh == NULL) {
            if (errno == EEXIST)
                logerrx(1, "msconvd already running, pid: %d", mpid);
            logwarn("cannot open pid file");
        }
        if (daemon(0, 0)) {
            int saved_errno = errno;
            pidfile_remove(pfh);
            errno = saved_errno;
            logerr(1, "failed to become a daemon");
        } else {
            background = true;
            pidfile_write(pfh);
        }
    }

    /* clear mouse data */
    bzero(&action, sizeof(action));

    /* process mouse data */
    for (;;) {

        FD_ZERO(&fds);
        FD_SET(rodent.mfd, &fds);
        if (rodent.mremsfd >= 0)
            FD_SET(rodent.mremsfd, &fds);
        if (rodent.mremcfd >= 0)
            FD_SET(rodent.mremcfd, &fds);

        c = select(FD_SETSIZE, &fds, NULL, NULL, NULL);
        if (c < 0) {                    /* error */
            logwarn("failed to read from mouse");
            continue;
        }
        /*  MouseRemote client connect/disconnect  */
        if ((rodent.mremsfd >= 0) && FD_ISSET(rodent.mremsfd, &fds)) {
            mremote_clientchg(true);
            continue;
        }
        if ((rodent.mremcfd >= 0) && FD_ISSET(rodent.mremcfd, &fds)) {
            mremote_clientchg(false);
            continue;
        }
        /* mouse movement */
        if (read(rodent.mfd, &b, 1) == -1) {
            if (errno == EWOULDBLOCK)
                continue;
            else
                return;
        }
        if ((flags = r_protocol(b, &action)) == 0)
            continue;

        debug("flags:%08x buttons:%08x obuttons:%08x", action.flags,
            action.button, action.obutton);

        if (flags) {
            if (r_uinput_report(rodent.ufd, &action) == -1) {
                logwarn("failed to write to uinput");
                return;
            }
        }
    }
    /* NOT REACHED */
}

static void
hup(__unused int sig)
{
    longjmp(env, 1);
}

static void
cleanup(__unused int sig)
{
    if (rodent.rtype == MOUSE_PROTO_X10MOUSEREM)
        unlink(_PATH_MOUSEREMOTE);
    exit(0);
}

static void
pause_mouse(__unused int sig)
{
    paused = !paused;
}

/**
 ** usage
 **
 ** Complain, and free the CPU for more worthy tasks
 **/
static void
usage(void)
{
    fprintf(stderr, "%s\n%s\n%s\n",
        "usage: msconvd [-DPRcdfs] [-I file] [-F rate] [-r resolution] [-S baudrate]",
        "               [-t <mousetype>] [-l level] -p <port>",
        "       msconvd [-Pd] -i <port|if|type|model|all> -p <port>");
    exit(1);
}

/*
 * Output an error message to syslog or stderr as appropriate. If
 * `errnum' is non-zero, append its string form to the message.
 */
static void
log_or_warn(int log_pri, int errnum, const char *fmt, ...)
{
        va_list ap;
        char buf[256];

        va_start(ap, fmt);
        vsnprintf(buf, sizeof(buf), fmt, ap);
        va_end(ap);
        if (errnum) {
                strlcat(buf, ": ", sizeof(buf));
                strlcat(buf, strerror(errnum), sizeof(buf));
        }

        if (background)
                syslog(log_pri, "%s", buf);
        else
                warnx("%s", buf);
}

/*
 * Setup uinput device as 8button mouse with wheel
 */
static int
r_uinput_register(void)
{
        struct uinput_setup     uisetup;
        char                    *phys;
        int                     fd;
        size_t                  i;

        fd = open("/dev/uinput", O_RDWR | O_NONBLOCK);
        if (fd < 0)
                return (-1);

        /* Set device name and bus/vendor information */
        memset(&uisetup, 0, sizeof(uisetup));
        snprintf(uisetup.name, UINPUT_MAX_NAME_SIZE,
            "%s mouse on %s", r_model(rodent.hw.model), rodent.portname);
        uisetup.id.bustype = r_bustype(rodent.hw.iftype);
        uisetup.id.vendor  = 0;
        uisetup.id.product = 0;
        uisetup.id.version = 0;
        phys = basename(__DECONST(char *, rodent.portname));
        if (ioctl(fd, UI_SET_PHYS, phys) < 0 ||
            ioctl(fd, UI_DEV_SETUP, &uisetup) < 0)
                goto bail_out;

        /* Advertise events and axes */
        if (ioctl(fd, UI_SET_EVBIT, EV_SYN) < 0 ||
            ioctl(fd, UI_SET_EVBIT, EV_KEY) < 0 ||
            ioctl(fd, UI_SET_EVBIT, EV_REL) < 0 ||
            ioctl(fd, UI_SET_RELBIT, REL_X) < 0 ||
            ioctl(fd, UI_SET_RELBIT, REL_Y) < 0 ||
            ioctl(fd, UI_SET_RELBIT, REL_WHEEL) < 0 ||
            ioctl(fd, UI_SET_PROPBIT, INPUT_PROP_POINTER) < 0)
                goto bail_out;

        /* Advertise mouse buttons */
        for (i = 0; i < nitems(evdev_buttons); i++)
                if (ioctl(fd, UI_SET_KEYBIT, evdev_buttons[i]) < 0)
                        goto bail_out;

        if (ioctl(fd, UI_DEV_CREATE) >= 0)
                return (fd); /* SUCCESS */

bail_out:
        close (fd);
        return (-1);
}

static int
uinput_event(int fd, uint16_t type, uint16_t code, int32_t value)
{
        struct input_event ie;

        if (debug >= 2 || paused)
                return (0);

        memset(&ie, 0, sizeof(ie));
        ie.type = type;
        ie.code = code;
        ie.value = value;
        return (write(fd, &ie, sizeof(ie)));
}

static int
r_uinput_report(int fd, mousestatus_t *act)
{
        size_t i;
        int32_t mask;

        if ((act->dx != 0 && uinput_event(fd, EV_REL, REL_X, act->dx) < 0) ||
            (act->dy != 0 && uinput_event(fd, EV_REL, REL_Y, act->dy) < 0) ||
            (act->dz != 0 && uinput_event(fd, EV_REL, REL_WHEEL, -act->dz) < 0))
                return (-1);

        for (i = 0; i < nitems(evdev_buttons); i++) {
                mask = 1 << i;
                if ((act->button & mask) == (act->obutton & mask))
                        continue;
                if (uinput_event(fd, EV_KEY, evdev_buttons[i],
                    (act->button & mask) != 0) < 0)
                        return (-1);
        }

        if (uinput_event(fd, EV_SYN, SYN_REPORT, 0) < 0)
                return (-1);

        return (0);
}

/**
 ** Mouse interface code, courtesy of XFree86 3.1.2.
 **
 ** Note: Various bits have been trimmed, and in my shortsighted enthusiasm
 ** to clean, reformat and rationalise naming, it's quite possible that
 ** some things in here have been broken.
 **
 ** I hope not 8)
 **
 ** The following code is derived from a module marked :
 **/

/* $XConsortium: xf86_Mouse.c,v 1.2 94/10/12 20:33:21 kaleb Exp $ */
/* $XFree86: xc/programs/Xserver/hw/xfree86/common/xf86_Mouse.c,v 3.2 1995/01/28
 17:03:40 dawes Exp $ */
/*
 *
 * Copyright 1990,91 by Thomas Roell, Dinkelscherben, Germany.
 * Copyright 1993 by David Dawes <dawes@physics.su.oz.au>
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the names of Thomas Roell and David Dawes not be
 * used in advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.  Thomas Roell
 * and David Dawes makes no representations about the suitability of this
 * software for any purpose.  It is provided "as is" without express or
 * implied warranty.
 *
 * THOMAS ROELL AND DAVID DAWES DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS, IN NO EVENT SHALL THOMAS ROELL OR DAVID DAWES BE LIABLE FOR ANY
 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
 * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

/**
 ** GlidePoint support from XFree86 3.2.
 ** Derived from the module:
 **/

/* $XFree86: xc/programs/Xserver/hw/xfree86/common/xf86_Mouse.c,v 3.19 1996/10/16 14:40:51 dawes Exp $ */
/* $XConsortium: xf86_Mouse.c /main/10 1996/01/30 15:16:12 kaleb $ */

/* the following table must be ordered by MOUSE_PROTO_XXX in mouse.h */
static unsigned char proto[][7] = {
    /*  hd_mask hd_id   dp_mask dp_id   bytes b4_mask b4_id */
    {   0x40,   0x40,   0x40,   0x00,   3,   ~0x23,  0x00 }, /* MicroSoft */
    {   0xf8,   0x80,   0x00,   0x00,   5,    0x00,  0xff }, /* MouseSystems */
    {   0xe0,   0x80,   0x80,   0x00,   3,    0x00,  0xff }, /* Logitech */
    {   0xe0,   0x80,   0x80,   0x00,   3,    0x00,  0xff }, /* MMSeries */
    {   0x40,   0x40,   0x40,   0x00,   3,   ~0x33,  0x00 }, /* MouseMan */
    {   0xf8,   0x80,   0x00,   0x00,   5,    0x00,  0xff }, /* Bus */
    {   0xf8,   0x80,   0x00,   0x00,   5,    0x00,  0xff }, /* InPort */
    {   0xc0,   0x00,   0x00,   0x00,   3,    0x00,  0xff }, /* PS/2 mouse */
    {   0xe0,   0x80,   0x80,   0x00,   3,    0x00,  0xff }, /* MM HitTablet */
    {   0x40,   0x40,   0x40,   0x00,   3,   ~0x33,  0x00 }, /* GlidePoint */
    {   0x40,   0x40,   0x40,   0x00,   3,   ~0x3f,  0x00 }, /* IntelliMouse */
    {   0x40,   0x40,   0x40,   0x00,   3,   ~0x33,  0x00 }, /* ThinkingMouse */
    {   0xf8,   0x80,   0x00,   0x00,   5,    0x00,  0xff }, /* sysmouse */
    {   0x40,   0x40,   0x40,   0x00,   3,   ~0x23,  0x00 }, /* X10 MouseRem */
    {   0x80,   0x80,   0x00,   0x00,   5,    0x00,  0xff }, /* KIDSPAD */
    {   0xc3,   0xc0,   0x00,   0x00,   6,    0x00,  0xff }, /* VersaPad */
    {   0x00,   0x00,   0x00,   0x00,   1,    0x00,  0xff }, /* JogDial */
#if notyet
    {   0xf8,   0x80,   0x00,   0x00,   5,   ~0x2f,  0x10 }, /* Mariqua */
#endif
};
static unsigned char cur_proto[7];

static int
r_identify(void)
{
    char pnpbuf[256];   /* PnP identifier string may be up to 256 bytes long */
    pnpid_t pnpid;
    symtab_t *t;
    int level;
    int len;

    /* set the driver operation level, if applicable */
    if (rodent.level < 0)
        rodent.level = 1;
    ioctl(rodent.mfd, MOUSE_SETLEVEL, &rodent.level);
    rodent.level = (ioctl(rodent.mfd, MOUSE_GETLEVEL, &level) == 0) ? level : 0;

    /*
     * Interrogate the driver and get some intelligence on the device...
     * The following ioctl functions are not always supported by device
     * drivers.  When the driver doesn't support them, we just trust the
     * user to supply valid information.
     */
    rodent.hw.iftype = MOUSE_IF_UNKNOWN;
    rodent.hw.model = MOUSE_MODEL_GENERIC;
    ioctl(rodent.mfd, MOUSE_GETHWINFO, &rodent.hw);

    if (rodent.rtype != MOUSE_PROTO_UNKNOWN)
        bcopy(proto[rodent.rtype], cur_proto, sizeof(cur_proto));
    rodent.mode.protocol = MOUSE_PROTO_UNKNOWN;
    rodent.mode.rate = -1;
    rodent.mode.resolution = MOUSE_RES_UNKNOWN;
    rodent.mode.accelfactor = 0;
    rodent.mode.level = 0;
    if (ioctl(rodent.mfd, MOUSE_GETMODE, &rodent.mode) == 0) {
        if (rodent.mode.protocol == MOUSE_PROTO_UNKNOWN ||
            rodent.mode.protocol >= (int)nitems(proto)) {
            logwarnx("unknown mouse protocol (%d)", rodent.mode.protocol);
            return (MOUSE_PROTO_UNKNOWN);
        } else {
            if (rodent.mode.protocol != rodent.rtype) {
                /* Hmm, the driver doesn't agree with the user... */
                if (rodent.rtype != MOUSE_PROTO_UNKNOWN)
                    logwarnx("mouse type mismatch (%s != %s), %s is assumed",
                        r_name(rodent.mode.protocol), r_name(rodent.rtype),
                        r_name(rodent.mode.protocol));
                rodent.rtype = rodent.mode.protocol;
                bcopy(proto[rodent.rtype], cur_proto, sizeof(cur_proto));
            }
        }
        cur_proto[4] = rodent.mode.packetsize;
        cur_proto[0] = rodent.mode.syncmask[0]; /* header byte bit mask */
        cur_proto[1] = rodent.mode.syncmask[1]; /* header bit pattern */
    }

    /* maybe this is a PnP mouse... */
    if (rodent.mode.protocol == MOUSE_PROTO_UNKNOWN) {

        if (rodent.flags & NoPnP)
            return (rodent.rtype);
        if (((len = pnpgets(pnpbuf)) <= 0) || !pnpparse(&pnpid, pnpbuf, len))
            return (rodent.rtype);

        debug("PnP serial mouse: '%*.*s' '%*.*s' '%*.*s'",
            pnpid.neisaid, pnpid.neisaid, pnpid.eisaid,
            pnpid.ncompat, pnpid.ncompat, pnpid.compat,
            pnpid.ndescription, pnpid.ndescription, pnpid.description);

        /* we have a valid PnP serial device ID */
        rodent.hw.iftype = MOUSE_IF_SERIAL;
        t = pnpproto(&pnpid);
        if (t != NULL) {
            rodent.mode.protocol = t->val;
            rodent.hw.model = t->val2;
        } else {
            rodent.mode.protocol = MOUSE_PROTO_UNKNOWN;
        }

        /* make final adjustment */
        if (rodent.mode.protocol != MOUSE_PROTO_UNKNOWN) {
            if (rodent.mode.protocol != rodent.rtype) {
                /* Hmm, the device doesn't agree with the user... */
                if (rodent.rtype != MOUSE_PROTO_UNKNOWN)
                    logwarnx("mouse type mismatch (%s != %s), %s is assumed",
                        r_name(rodent.mode.protocol), r_name(rodent.rtype),
                        r_name(rodent.mode.protocol));
                rodent.rtype = rodent.mode.protocol;
                bcopy(proto[rodent.rtype], cur_proto, sizeof(cur_proto));
            }
        }
    }

    debug("proto params: %02x %02x %02x %02x %d %02x %02x",
        cur_proto[0], cur_proto[1], cur_proto[2], cur_proto[3],
        cur_proto[4], cur_proto[5], cur_proto[6]);

    return (rodent.rtype);
}

static const char *
r_if(int iftype)
{

    return (gettokenname(rifs, iftype));
}

static uint16_t
r_bustype(int iftype)
{
    return (gettokenval2(rifs, iftype));
}

static const char *
r_name(int type)
{
    const char *unknown = "unknown";

    return (type == MOUSE_PROTO_UNKNOWN || type >= (int)nitems(rnames) ?
        unknown : rnames[type]);
}

static const char *
r_model(int model)
{

    return (gettokenname(rmodels, model));
}

static void
r_init(void)
{
    unsigned char buf[16];      /* scrach buffer */
    fd_set fds;
    const char *s;
    char c;
    int i;

    /**
     ** This comment is a little out of context here, but it contains
     ** some useful information...
     ********************************************************************
     **
     ** The following lines take care of the Logitech MouseMan protocols.
     **
     ** NOTE: There are different versions of both MouseMan and TrackMan!
     **       Hence I add another protocol P_LOGIMAN, which the user can
     **       specify as MouseMan in his XF86Config file. This entry was
     **       formerly handled as a special case of P_MS. However, people
     **       who don't have the middle button problem, can still specify
     **       Microsoft and use P_MS.
     **
     ** By default, these mice should use a 3 byte Microsoft protocol
     ** plus a 4th byte for the middle button. However, the mouse might
     ** have switched to a different protocol before we use it, so I send
     ** the proper sequence just in case.
     **
     ** NOTE: - all commands to (at least the European) MouseMan have to
     **         be sent at 1200 Baud.
     **       - each command starts with a '*'.
     **       - whenever the MouseMan receives a '*', it will switch back
     **  to 1200 Baud. Hence I have to select the desired protocol
     **  first, then select the baud rate.
     **
     ** The protocols supported by the (European) MouseMan are:
     **   -  5 byte packed binary protocol, as with the Mouse Systems
     **      mouse. Selected by sequence "*U".
     **   -  2 button 3 byte MicroSoft compatible protocol. Selected
     **      by sequence "*V".
     **   -  3 button 3+1 byte MicroSoft compatible protocol (default).
     **      Selected by sequence "*X".
     **
     ** The following baud rates are supported:
     **   -  1200 Baud (default). Selected by sequence "*n".
     **   -  9600 Baud. Selected by sequence "*q".
     **
     ** Selecting a sample rate is no longer supported with the MouseMan!
     ** Some additional lines in xf86Config.c take care of ill configured
     ** baud rates and sample rates. (The user will get an error.)
     */

    switch (rodent.rtype) {

    case MOUSE_PROTO_LOGI:
        /*
         * The baud rate selection command must be sent at the current
         * baud rate; try all likely settings
         */
        setmousespeed(9600, rodent.baudrate, rodentcflags[rodent.rtype]);
        setmousespeed(4800, rodent.baudrate, rodentcflags[rodent.rtype]);
        setmousespeed(2400, rodent.baudrate, rodentcflags[rodent.rtype]);
        setmousespeed(1200, rodent.baudrate, rodentcflags[rodent.rtype]);
        /* select MM series data format */
        write(rodent.mfd, "S", 1);
        setmousespeed(rodent.baudrate, rodent.baudrate,
                      rodentcflags[MOUSE_PROTO_MM]);
        /* select report rate/frequency */
        if      (rodent.rate <= 0)   write(rodent.mfd, "O", 1);
        else if (rodent.rate <= 15)  write(rodent.mfd, "J", 1);
        else if (rodent.rate <= 27)  write(rodent.mfd, "K", 1);
        else if (rodent.rate <= 42)  write(rodent.mfd, "L", 1);
        else if (rodent.rate <= 60)  write(rodent.mfd, "R", 1);
        else if (rodent.rate <= 85)  write(rodent.mfd, "M", 1);
        else if (rodent.rate <= 125) write(rodent.mfd, "Q", 1);
        else                         write(rodent.mfd, "N", 1);
        break;

    case MOUSE_PROTO_LOGIMOUSEMAN:
        /* The command must always be sent at 1200 baud */
        setmousespeed(1200, 1200, rodentcflags[rodent.rtype]);
        write(rodent.mfd, "*X", 2);
        setmousespeed(1200, rodent.baudrate, rodentcflags[rodent.rtype]);
        break;

    case MOUSE_PROTO_HITTAB:
        setmousespeed(1200, rodent.baudrate, rodentcflags[rodent.rtype]);

        /*
         * Initialize Hitachi PUMA Plus - Model 1212E to desired settings.
         * The tablet must be configured to be in MM mode, NO parity,
         * Binary Format.  xf86Info.sampleRate controls the sensativity
         * of the tablet.  We only use this tablet for it's 4-button puck
         * so we don't run in "Absolute Mode"
         */
        write(rodent.mfd, "z8", 2);     /* Set Parity = "NONE" */
        usleep(50000);
        write(rodent.mfd, "zb", 2);     /* Set Format = "Binary" */
        usleep(50000);
        write(rodent.mfd, "@", 1);      /* Set Report Mode = "Stream" */
        usleep(50000);
        write(rodent.mfd, "R", 1);      /* Set Output Rate = "45 rps" */
        usleep(50000);
        write(rodent.mfd, "I\x20", 2);  /* Set Incrememtal Mode "20" */
        usleep(50000);
        write(rodent.mfd, "E", 1);      /* Set Data Type = "Relative */
        usleep(50000);

        /* Resolution is in 'lines per inch' on the Hitachi tablet */
        if      (rodent.resolution == MOUSE_RES_LOW)            c = 'g';
        else if (rodent.resolution == MOUSE_RES_MEDIUMLOW)      c = 'e';
        else if (rodent.resolution == MOUSE_RES_MEDIUMHIGH)     c = 'h';
        else if (rodent.resolution == MOUSE_RES_HIGH)           c = 'd';
        else if (rodent.resolution <=   40)                     c = 'g';
        else if (rodent.resolution <=  100)                     c = 'd';
        else if (rodent.resolution <=  200)                     c = 'e';
        else if (rodent.resolution <=  500)                     c = 'h';
        else if (rodent.resolution <= 1000)                     c = 'j';
        else                    c = 'd';
        write(rodent.mfd, &c, 1);
        usleep(50000);

        write(rodent.mfd, "\021", 1);   /* Resume DATA output */
        break;

    case MOUSE_PROTO_THINK:
        setmousespeed(1200, rodent.baudrate, rodentcflags[rodent.rtype]);
        /* the PnP ID string may be sent again, discard it */
        usleep(200000);
        i = FREAD;
        ioctl(rodent.mfd, TIOCFLUSH, &i);
        /* send the command to initialize the beast */
        for (s = "E5E5"; *s; ++s) {
            write(rodent.mfd, s, 1);
            FD_ZERO(&fds);
            FD_SET(rodent.mfd, &fds);
            if (select(FD_SETSIZE, &fds, NULL, NULL, NULL) <= 0)
                break;
            read(rodent.mfd, &c, 1);
            debug("%c", c);
            if (c != *s)
                break;
        }
        break;

    case MOUSE_PROTO_JOGDIAL:
        break;
    case MOUSE_PROTO_MSC:
        setmousespeed(1200, rodent.baudrate, rodentcflags[rodent.rtype]);
        if (rodent.flags & ClearDTR) {
           i = TIOCM_DTR;
           ioctl(rodent.mfd, TIOCMBIC, &i);
        }
        if (rodent.flags & ClearRTS) {
           i = TIOCM_RTS;
           ioctl(rodent.mfd, TIOCMBIC, &i);
        }
        break;

    case MOUSE_PROTO_SYSMOUSE:
        if (rodent.hw.iftype == MOUSE_IF_SYSMOUSE)
            setmousespeed(1200, rodent.baudrate, rodentcflags[rodent.rtype]);
        /* FALLTHROUGH */

    case MOUSE_PROTO_PS2:
        if (rodent.rate >= 0)
            rodent.mode.rate = rodent.rate;
        if (rodent.resolution != MOUSE_RES_UNKNOWN)
            rodent.mode.resolution = rodent.resolution;
        ioctl(rodent.mfd, MOUSE_SETMODE, &rodent.mode);
        break;

    case MOUSE_PROTO_X10MOUSEREM:
        mremote_serversetup();
        setmousespeed(1200, rodent.baudrate, rodentcflags[rodent.rtype]);
        break;


    case MOUSE_PROTO_VERSAPAD:
        tcsendbreak(rodent.mfd, 0);     /* send break for 400 msec */
        i = FREAD;
        ioctl(rodent.mfd, TIOCFLUSH, &i);
        for (i = 0; i < 7; ++i) {
            FD_ZERO(&fds);
            FD_SET(rodent.mfd, &fds);
            if (select(FD_SETSIZE, &fds, NULL, NULL, NULL) <= 0)
                break;
            read(rodent.mfd, &c, 1);
            buf[i] = c;
        }
        debug("%s\n", buf);
        if ((buf[0] != 'V') || (buf[1] != 'P')|| (buf[7] != '\r'))
            break;
        setmousespeed(9600, rodent.baudrate, rodentcflags[rodent.rtype]);
        tcsendbreak(rodent.mfd, 0);     /* send break for 400 msec again */
        for (i = 0; i < 7; ++i) {
            FD_ZERO(&fds);
            FD_SET(rodent.mfd, &fds);
            if (select(FD_SETSIZE, &fds, NULL, NULL, NULL) <= 0)
                break;
            read(rodent.mfd, &c, 1);
            debug("%c", c);
            if (c != buf[i])
                break;
        }
        i = FREAD;
        ioctl(rodent.mfd, TIOCFLUSH, &i);
        break;

    default:
        setmousespeed(1200, rodent.baudrate, rodentcflags[rodent.rtype]);
        break;
    }
}

static int
r_protocol(u_char rBuf, mousestatus_t *act)
{
    /* MOUSE_MSS_BUTTON?DOWN -> MOUSE_BUTTON?DOWN */
    static int butmapmss[4] = { /* Microsoft, MouseMan, GlidePoint,
                                   IntelliMouse, Thinking Mouse */
        0,
        MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON1DOWN,
        MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN,
    };
    static int butmapmss2[4] = { /* Microsoft, MouseMan, GlidePoint,
                                    Thinking Mouse */
        0,
        MOUSE_BUTTON4DOWN,
        MOUSE_BUTTON2DOWN,
        MOUSE_BUTTON2DOWN | MOUSE_BUTTON4DOWN,
    };
    /* MOUSE_INTELLI_BUTTON?DOWN -> MOUSE_BUTTON?DOWN */
    static int butmapintelli[4] = { /* IntelliMouse, NetMouse, Mie Mouse,
                                       MouseMan+ */
        0,
        MOUSE_BUTTON2DOWN,
        MOUSE_BUTTON4DOWN,
        MOUSE_BUTTON2DOWN | MOUSE_BUTTON4DOWN,
    };
    /* MOUSE_MSC_BUTTON?UP -> MOUSE_BUTTON?DOWN */
    static int butmapmsc[8] = { /* MouseSystems, MMSeries, Logitech,
                                   Bus, sysmouse */
        0,
        MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON2DOWN,
        MOUSE_BUTTON2DOWN | MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON1DOWN,
        MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON1DOWN | MOUSE_BUTTON2DOWN,
        MOUSE_BUTTON1DOWN | MOUSE_BUTTON2DOWN | MOUSE_BUTTON3DOWN
    };
    /* MOUSE_PS2_BUTTON?DOWN -> MOUSE_BUTTON?DOWN */
    static int butmapps2[8] = { /* PS/2 */
        0,
        MOUSE_BUTTON1DOWN,
        MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON2DOWN,
        MOUSE_BUTTON1DOWN | MOUSE_BUTTON2DOWN,
        MOUSE_BUTTON2DOWN | MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON1DOWN | MOUSE_BUTTON2DOWN | MOUSE_BUTTON3DOWN
    };
    /* for Hitachi tablet */
    static int butmaphit[8] = { /* MM HitTablet */
        0,
        MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON2DOWN,
        MOUSE_BUTTON1DOWN,
        MOUSE_BUTTON4DOWN,
        MOUSE_BUTTON5DOWN,
        MOUSE_BUTTON6DOWN,
        MOUSE_BUTTON7DOWN,
    };
    /* for serial VersaPad */
    static int butmapversa[8] = { /* VersaPad */
        0,
        0,
        MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON1DOWN,
        MOUSE_BUTTON1DOWN,
        MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN,
    };
    /* for PS/2 VersaPad */
    static int butmapversaps2[8] = { /* VersaPad */
        0,
        MOUSE_BUTTON3DOWN,
        0,
        MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON1DOWN,
        MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON1DOWN,
        MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN,
    };
    static int           pBufP = 0;
    static unsigned char pBuf[8];
    static int           prev_x, prev_y;
    static bool          on = false;
    int                  x, y;

    debug("received char 0x%x",(int)rBuf);
    if (rodent.rtype == MOUSE_PROTO_KIDSPAD)
        return (kidspad(rBuf, act));
    if (rodent.rtype == MOUSE_PROTO_GTCO_DIGIPAD)
        return (gtco_digipad(rBuf, act));

    /*
     * Hack for resyncing: We check here for a package that is:
     *  a) illegal (detected by wrong data-package header)
     *  b) invalid (0x80 == -128 and that might be wrong for MouseSystems)
     *  c) bad header-package
     *
     * NOTE: b) is a voilation of the MouseSystems-Protocol, since values of
     *       -128 are allowed, but since they are very seldom we can easily
     *       use them as package-header with no button pressed.
     * NOTE/2: On a PS/2 mouse any byte is valid as a data byte. Furthermore,
     *         0x80 is not valid as a header byte. For a PS/2 mouse we skip
     *         checking data bytes.
     *         For resyncing a PS/2 mouse we require the two most significant
     *         bits in the header byte to be 0. These are the overflow bits,
     *         and in case of an overflow we actually lose sync. Overflows
     *         are very rare, however, and we quickly gain sync again after
     *         an overflow condition. This is the best we can do. (Actually,
     *         we could use bit 0x08 in the header byte for resyncing, since
     *         that bit is supposed to be always on, but nobody told
     *         Microsoft...)
     */

    if (pBufP != 0 && rodent.rtype != MOUSE_PROTO_PS2 &&
        ((rBuf & cur_proto[2]) != cur_proto[3] || rBuf == 0x80))
    {
        pBufP = 0;              /* skip package */
    }

    if (pBufP == 0 && (rBuf & cur_proto[0]) != cur_proto[1])
        return (0);

    /* is there an extra data byte? */
    if (pBufP >= cur_proto[4] && (rBuf & cur_proto[0]) != cur_proto[1])
    {
        /*
         * Hack for Logitech MouseMan Mouse - Middle button
         *
         * Unfortunately this mouse has variable length packets: the standard
         * Microsoft 3 byte packet plus an optional 4th byte whenever the
         * middle button status changes.
         *
         * We have already processed the standard packet with the movement
         * and button info.  Now post an event message with the old status
         * of the left and right buttons and the updated middle button.
         */

        /*
         * Even worse, different MouseMen and TrackMen differ in the 4th
         * byte: some will send 0x00/0x20, others 0x01/0x21, or even
         * 0x02/0x22, so I have to strip off the lower bits.
         *
         * [JCH-96/01/21]
         * HACK for ALPS "fourth button". (It's bit 0x10 of the "fourth byte"
         * and it is activated by tapping the glidepad with the finger! 8^)
         * We map it to bit bit3, and the reverse map in xf86Events just has
         * to be extended so that it is identified as Button 4. The lower
         * half of the reverse-map may remain unchanged.
         */

        /*
         * [KY-97/08/03]
         * Receive the fourth byte only when preceding three bytes have
         * been detected (pBufP >= cur_proto[4]).  In the previous
         * versions, the test was pBufP == 0; thus, we may have mistakingly
         * received a byte even if we didn't see anything preceding
         * the byte.
         */

        if ((rBuf & cur_proto[5]) != cur_proto[6]) {
            pBufP = 0;
            return (0);
        }

        switch (rodent.rtype) {
#if notyet
        case MOUSE_PROTO_MARIQUA:
            /*
             * This mouse has 16! buttons in addition to the standard
             * three of them.  They return 0x10 though 0x1f in the
             * so-called `ten key' mode and 0x30 though 0x3f in the
             * `function key' mode.  As there are only 31 bits for
             * button state (including the standard three), we ignore
             * the bit 0x20 and don't distinguish the two modes.
             */
            act->dx = act->dy = act->dz = 0;
            act->obutton = act->button;
            rBuf &= 0x1f;
            act->button = (1 << (rBuf - 13))
                | (act->obutton & (MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN));
            /*
             * FIXME: this is a button "down" event. There needs to be
             * a corresponding button "up" event... XXX
             */
            break;
#endif /* notyet */
        case MOUSE_PROTO_JOGDIAL:
            break;

        /*
         * IntelliMouse, NetMouse (including NetMouse Pro) and Mie Mouse
         * always send the fourth byte, whereas the fourth byte is
         * optional for GlidePoint and ThinkingMouse. The fourth byte
         * is also optional for MouseMan+ and FirstMouse+ in their
         * native mode. It is always sent if they are in the IntelliMouse
         * compatible mode.
         */
        case MOUSE_PROTO_INTELLI:       /* IntelliMouse, NetMouse, Mie Mouse,
                                           MouseMan+ */
            act->dx = act->dy = 0;
            act->dz = (rBuf & 0x08) ? (rBuf & 0x0f) - 16 : (rBuf & 0x0f);
            if ((act->dz >= 7) || (act->dz <= -7))
                act->dz = 0;
            act->obutton = act->button;
            act->button = butmapintelli[(rBuf & MOUSE_MSS_BUTTONS) >> 4]
                | (act->obutton & (MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN));
            break;

        default:
            act->dx = act->dy = act->dz = 0;
            act->obutton = act->button;
            act->button = butmapmss2[(rBuf & MOUSE_MSS_BUTTONS) >> 4]
                | (act->obutton & (MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN));
            break;
        }

        act->flags = ((act->dx || act->dy || act->dz) ? MOUSE_POSCHANGED : 0)
            | (act->obutton ^ act->button);
        pBufP = 0;
        return (act->flags);
    }

    if (pBufP >= cur_proto[4])
        pBufP = 0;
    pBuf[pBufP++] = rBuf;
    if (pBufP != cur_proto[4])
        return (0);

    /*
     * assembly full package
     */

    debug("assembled full packet (len %d) %x,%x,%x,%x,%x,%x,%x,%x",
        cur_proto[4],
        pBuf[0], pBuf[1], pBuf[2], pBuf[3],
        pBuf[4], pBuf[5], pBuf[6], pBuf[7]);

    act->dz = 0;
    act->obutton = act->button;
    switch (rodent.rtype)
    {
    case MOUSE_PROTO_MS:                /* Microsoft */
    case MOUSE_PROTO_LOGIMOUSEMAN:      /* MouseMan/TrackMan */
    case MOUSE_PROTO_X10MOUSEREM:       /* X10 MouseRemote */
        act->button = act->obutton & MOUSE_BUTTON4DOWN;
        if (rodent.flags & ChordMiddle)
            act->button |= ((pBuf[0] & MOUSE_MSS_BUTTONS) == MOUSE_MSS_BUTTONS)
                ? MOUSE_BUTTON2DOWN
                : butmapmss[(pBuf[0] & MOUSE_MSS_BUTTONS) >> 4];
        else
            act->button |= (act->obutton & MOUSE_BUTTON2DOWN)
                | butmapmss[(pBuf[0] & MOUSE_MSS_BUTTONS) >> 4];

        /* Send X10 btn events to remote client (ensure -128-+127 range) */
        if ((rodent.rtype == MOUSE_PROTO_X10MOUSEREM) &&
            ((pBuf[0] & 0xFC) == 0x44) && (pBuf[2] == 0x3F)) {
            if (rodent.mremcfd >= 0) {
                unsigned char key = (signed char)(((pBuf[0] & 0x03) << 6) |
                                                  (pBuf[1] & 0x3F));
                write(rodent.mremcfd, &key, 1);
            }
            return (0);
        }

        act->dx = (signed char)(((pBuf[0] & 0x03) << 6) | (pBuf[1] & 0x3F));
        act->dy = (signed char)(((pBuf[0] & 0x0C) << 4) | (pBuf[2] & 0x3F));
        break;

    case MOUSE_PROTO_GLIDEPOINT:        /* GlidePoint */
    case MOUSE_PROTO_THINK:             /* ThinkingMouse */
    case MOUSE_PROTO_INTELLI:           /* IntelliMouse, NetMouse, Mie Mouse,
                                           MouseMan+ */
        act->button = (act->obutton & (MOUSE_BUTTON2DOWN | MOUSE_BUTTON4DOWN))
            | butmapmss[(pBuf[0] & MOUSE_MSS_BUTTONS) >> 4];
        act->dx = (signed char)(((pBuf[0] & 0x03) << 6) | (pBuf[1] & 0x3F));
        act->dy = (signed char)(((pBuf[0] & 0x0C) << 4) | (pBuf[2] & 0x3F));
        break;

    case MOUSE_PROTO_MSC:               /* MouseSystems Corp */
#if notyet
    case MOUSE_PROTO_MARIQUA:           /* Mariqua */
#endif
        act->button = butmapmsc[(~pBuf[0]) & MOUSE_MSC_BUTTONS];
        act->dx =    (signed char)(pBuf[1]) + (signed char)(pBuf[3]);
        act->dy = - ((signed char)(pBuf[2]) + (signed char)(pBuf[4]));
        break;

    case MOUSE_PROTO_JOGDIAL:           /* JogDial */
            if (rBuf == 0x6c)
              act->dz = -1;
            if (rBuf == 0x72)
              act->dz = 1;
            if (rBuf == 0x64)
              act->button = MOUSE_BUTTON1DOWN;
            if (rBuf == 0x75)
              act->button = 0;
        break;

    case MOUSE_PROTO_HITTAB:            /* MM HitTablet */
        act->button = butmaphit[pBuf[0] & 0x07];
        act->dx = (pBuf[0] & MOUSE_MM_XPOSITIVE) ?   pBuf[1] : - pBuf[1];
        act->dy = (pBuf[0] & MOUSE_MM_YPOSITIVE) ? - pBuf[2] :   pBuf[2];
        break;

    case MOUSE_PROTO_MM:                /* MM Series */
    case MOUSE_PROTO_LOGI:              /* Logitech Mice */
        act->button = butmapmsc[pBuf[0] & MOUSE_MSC_BUTTONS];
        act->dx = (pBuf[0] & MOUSE_MM_XPOSITIVE) ?   pBuf[1] : - pBuf[1];
        act->dy = (pBuf[0] & MOUSE_MM_YPOSITIVE) ? - pBuf[2] :   pBuf[2];
        break;

    case MOUSE_PROTO_VERSAPAD:          /* VersaPad */
        act->button = butmapversa[(pBuf[0] & MOUSE_VERSA_BUTTONS) >> 3];
        act->button |= (pBuf[0] & MOUSE_VERSA_TAP) ? MOUSE_BUTTON4DOWN : 0;
        act->dx = act->dy = 0;
        if (!(pBuf[0] & MOUSE_VERSA_IN_USE)) {
            on = false;
            break;
        }
        x = (pBuf[2] << 6) | pBuf[1];
        if (x & 0x800)
            x -= 0x1000;
        y = (pBuf[4] << 6) | pBuf[3];
        if (y & 0x800)
            y -= 0x1000;
        if (on) {
            act->dx = prev_x - x;
            act->dy = prev_y - y;
        } else {
            on = true;
        }
        prev_x = x;
        prev_y = y;
        break;

    case MOUSE_PROTO_PS2:               /* PS/2 */
        act->button = butmapps2[pBuf[0] & MOUSE_PS2_BUTTONS];
        act->dx = (pBuf[0] & MOUSE_PS2_XNEG) ?    pBuf[1] - 256  :  pBuf[1];
        act->dy = (pBuf[0] & MOUSE_PS2_YNEG) ?  -(pBuf[2] - 256) : -pBuf[2];
        /*
         * Moused usually operates the psm driver at the operation level 1
         * which sends mouse data in MOUSE_PROTO_SYSMOUSE protocol.
         * The following code takes effect only when the user explicitly
         * requets the level 2 at which wheel movement and additional button
         * actions are encoded in model-dependent formats. At the level 0
         * the following code is no-op because the psm driver says the model
         * is MOUSE_MODEL_GENERIC.
         */
        switch (rodent.hw.model) {
        case MOUSE_MODEL_EXPLORER:
            /* wheel and additional button data is in the fourth byte */
            act->dz = (pBuf[3] & MOUSE_EXPLORER_ZNEG)
                ? (pBuf[3] & 0x0f) - 16 : (pBuf[3] & 0x0f);
            act->button |= (pBuf[3] & MOUSE_EXPLORER_BUTTON4DOWN)
                ? MOUSE_BUTTON4DOWN : 0;
            act->button |= (pBuf[3] & MOUSE_EXPLORER_BUTTON5DOWN)
                ? MOUSE_BUTTON5DOWN : 0;
            break;
        case MOUSE_MODEL_INTELLI:
        case MOUSE_MODEL_NET:
            /* wheel data is in the fourth byte */
            act->dz = (signed char)pBuf[3];
            if ((act->dz >= 7) || (act->dz <= -7))
                act->dz = 0;
            /* some compatible mice may have additional buttons */
            act->button |= (pBuf[0] & MOUSE_PS2INTELLI_BUTTON4DOWN)
                ? MOUSE_BUTTON4DOWN : 0;
            act->button |= (pBuf[0] & MOUSE_PS2INTELLI_BUTTON5DOWN)
                ? MOUSE_BUTTON5DOWN : 0;
            break;
        case MOUSE_MODEL_MOUSEMANPLUS:
            if (((pBuf[0] & MOUSE_PS2PLUS_SYNCMASK) == MOUSE_PS2PLUS_SYNC)
                    && (abs(act->dx) > 191)
                    && MOUSE_PS2PLUS_CHECKBITS(pBuf)) {
                /* the extended data packet encodes button and wheel events */
                switch (MOUSE_PS2PLUS_PACKET_TYPE(pBuf)) {
                case 1:
                    /* wheel data packet */
                    act->dx = act->dy = 0;
                    if (pBuf[2] & 0x80) {
                        /* horizontal roller count - ignore it XXX*/
                    } else {
                        /* vertical roller count */
                        act->dz = (pBuf[2] & MOUSE_PS2PLUS_ZNEG)
                            ? (pBuf[2] & 0x0f) - 16 : (pBuf[2] & 0x0f);
                    }
                    act->button |= (pBuf[2] & MOUSE_PS2PLUS_BUTTON4DOWN)
                        ? MOUSE_BUTTON4DOWN : 0;
                    act->button |= (pBuf[2] & MOUSE_PS2PLUS_BUTTON5DOWN)
                        ? MOUSE_BUTTON5DOWN : 0;
                    break;
                case 2:
                    /* this packet type is reserved by Logitech */
                    /*
                     * IBM ScrollPoint Mouse uses this packet type to
                     * encode both vertical and horizontal scroll movement.
                     */
                    act->dx = act->dy = 0;
                    /* horizontal roller count */
                    if (pBuf[2] & 0x0f)
                        act->dz = (pBuf[2] & MOUSE_SPOINT_WNEG) ? -2 : 2;
                    /* vertical roller count */
                    if (pBuf[2] & 0xf0)
                        act->dz = (pBuf[2] & MOUSE_SPOINT_ZNEG) ? -1 : 1;
#if 0
                    /* vertical roller count */
                    act->dz = (pBuf[2] & MOUSE_SPOINT_ZNEG)
                        ? ((pBuf[2] >> 4) & 0x0f) - 16
                        : ((pBuf[2] >> 4) & 0x0f);
                    /* horizontal roller count */
                    act->dw = (pBuf[2] & MOUSE_SPOINT_WNEG)
                        ? (pBuf[2] & 0x0f) - 16 : (pBuf[2] & 0x0f);
#endif
                    break;
                case 0:
                    /* device type packet - shouldn't happen */
                    /* FALLTHROUGH */
                default:
                    act->dx = act->dy = 0;
                    act->button = act->obutton;
                    debug("unknown PS2++ packet type %d: 0x%02x 0x%02x 0x%02x\n",
                          MOUSE_PS2PLUS_PACKET_TYPE(pBuf),
                          pBuf[0], pBuf[1], pBuf[2]);
                    break;
                }
            } else {
                /* preserve button states */
                act->button |= act->obutton & MOUSE_EXTBUTTONS;
            }
            break;
        case MOUSE_MODEL_GLIDEPOINT:
            /* `tapping' action */
            act->button |= ((pBuf[0] & MOUSE_PS2_TAP)) ? 0 : MOUSE_BUTTON4DOWN;
            break;
        case MOUSE_MODEL_NETSCROLL:
            /* three additional bytes encode buttons and wheel events */
            act->button |= (pBuf[3] & MOUSE_PS2_BUTTON3DOWN)
                ? MOUSE_BUTTON4DOWN : 0;
            act->button |= (pBuf[3] & MOUSE_PS2_BUTTON1DOWN)
                ? MOUSE_BUTTON5DOWN : 0;
            act->dz = (pBuf[3] & MOUSE_PS2_XNEG) ? pBuf[4] - 256 : pBuf[4];
            break;
        case MOUSE_MODEL_THINK:
            /* the fourth button state in the first byte */
            act->button |= (pBuf[0] & MOUSE_PS2_TAP) ? MOUSE_BUTTON4DOWN : 0;
            break;
        case MOUSE_MODEL_VERSAPAD:
            act->button = butmapversaps2[pBuf[0] & MOUSE_PS2VERSA_BUTTONS];
            act->button |=
                (pBuf[0] & MOUSE_PS2VERSA_TAP) ? MOUSE_BUTTON4DOWN : 0;
            act->dx = act->dy = 0;
            if (!(pBuf[0] & MOUSE_PS2VERSA_IN_USE)) {
                on = false;
                break;
            }
            x = ((pBuf[4] << 8) & 0xf00) | pBuf[1];
            if (x & 0x800)
                x -= 0x1000;
            y = ((pBuf[4] << 4) & 0xf00) | pBuf[2];
            if (y & 0x800)
                y -= 0x1000;
            if (on) {
                act->dx = prev_x - x;
                act->dy = prev_y - y;
            } else {
                on = true;
            }
            prev_x = x;
            prev_y = y;
            break;
        case MOUSE_MODEL_4D:
            act->dx = (pBuf[1] & 0x80) ?    pBuf[1] - 256  :  pBuf[1];
            act->dy = (pBuf[2] & 0x80) ?  -(pBuf[2] - 256) : -pBuf[2];
            switch (pBuf[0] & MOUSE_4D_WHEELBITS) {
            case 0x10:
                act->dz = 1;
                break;
            case 0x30:
                act->dz = -1;
                break;
            case 0x40:  /* 2nd wheel rolling right XXX */
                act->dz = 2;
                break;
            case 0xc0:  /* 2nd wheel rolling left XXX */
                act->dz = -2;
                break;
            }
            break;
        case MOUSE_MODEL_4DPLUS:
            if ((act->dx < 16 - 256) && (act->dy > 256 - 16)) {
                act->dx = act->dy = 0;
                if (pBuf[2] & MOUSE_4DPLUS_BUTTON4DOWN)
                    act->button |= MOUSE_BUTTON4DOWN;
                act->dz = (pBuf[2] & MOUSE_4DPLUS_ZNEG)
                              ? ((pBuf[2] & 0x07) - 8) : (pBuf[2] & 0x07);
            } else {
                /* preserve previous button states */
                act->button |= act->obutton & MOUSE_EXTBUTTONS;
            }
            break;
        case MOUSE_MODEL_GENERIC:
        default:
            break;
        }
        break;

    case MOUSE_PROTO_SYSMOUSE:          /* sysmouse */
        act->button = butmapmsc[(~pBuf[0]) & MOUSE_SYS_STDBUTTONS];
        act->dx =    (signed char)(pBuf[1]) + (signed char)(pBuf[3]);
        act->dy = - ((signed char)(pBuf[2]) + (signed char)(pBuf[4]));
        if (rodent.level == 1) {
            act->dz = ((signed char)(pBuf[5] << 1) + (signed char)(pBuf[6] << 1)) >> 1;
            act->button |= ((~pBuf[7] & MOUSE_SYS_EXTBUTTONS) << 3);
        }
        break;

    default:
        return (0);
    }
    /*
     * We don't reset pBufP here yet, as there may be an additional data
     * byte in some protocols. See above.
     */

    /* has something changed? */
    act->flags = ((act->dx || act->dy || act->dz) ? MOUSE_POSCHANGED : 0)
        | (act->obutton ^ act->button);

    return (act->flags);
}

/* $XConsortium: posix_tty.c,v 1.3 95/01/05 20:42:55 kaleb Exp $ */
/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/shared/posix_tty.c,v 3.4 1995/01/28 17:05:03 dawes Exp $ */
/*
 * Copyright 1993 by David Dawes <dawes@physics.su.oz.au>
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of David Dawes
 * not be used in advertising or publicity pertaining to distribution of
 * the software without specific, written prior permission.
 * David Dawes makes no representations about the suitability of this
 * software for any purpose.  It is provided "as is" without express or
 * implied warranty.
 *
 * DAVID DAWES DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS, IN NO EVENT SHALL DAVID DAWES BE LIABLE FOR
 * ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
 * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */


static void
setmousespeed(int old, int new, unsigned cflag)
{
        struct termios tty;
        const char *c;

        if (tcgetattr(rodent.mfd, &tty) < 0)
        {
                logwarn("unable to get status of mouse fd");
                return;
        }

        tty.c_iflag = IGNBRK | IGNPAR;
        tty.c_oflag = 0;
        tty.c_lflag = 0;
        tty.c_cflag = (tcflag_t)cflag;
        tty.c_cc[VTIME] = 0;
        tty.c_cc[VMIN] = 1;

        switch (old)
        {
        case 9600:
                cfsetispeed(&tty, B9600);
                cfsetospeed(&tty, B9600);
                break;
        case 4800:
                cfsetispeed(&tty, B4800);
                cfsetospeed(&tty, B4800);
                break;
        case 2400:
                cfsetispeed(&tty, B2400);
                cfsetospeed(&tty, B2400);
                break;
        case 1200:
        default:
                cfsetispeed(&tty, B1200);
                cfsetospeed(&tty, B1200);
        }

        if (tcsetattr(rodent.mfd, TCSADRAIN, &tty) < 0)
        {
                logwarn("unable to set status of mouse fd");
                return;
        }

        switch (new)
        {
        case 9600:
                c = "*q";
                cfsetispeed(&tty, B9600);
                cfsetospeed(&tty, B9600);
                break;
        case 4800:
                c = "*p";
                cfsetispeed(&tty, B4800);
                cfsetospeed(&tty, B4800);
                break;
        case 2400:
                c = "*o";
                cfsetispeed(&tty, B2400);
                cfsetospeed(&tty, B2400);
                break;
        case 1200:
        default:
                c = "*n";
                cfsetispeed(&tty, B1200);
                cfsetospeed(&tty, B1200);
        }

        if (rodent.rtype == MOUSE_PROTO_LOGIMOUSEMAN
            || rodent.rtype == MOUSE_PROTO_LOGI)
        {
                if (write(rodent.mfd, c, 2) != 2)
                {
                        logwarn("unable to write to mouse fd");
                        return;
                }
        }
        usleep(100000);

        if (tcsetattr(rodent.mfd, TCSADRAIN, &tty) < 0)
                logwarn("unable to set status of mouse fd");
}

/*
 * PnP COM device support
 *
 * It's a simplistic implementation, but it works :-)
 * KY, 31/7/97.
 */

/*
 * Try to elicit a PnP ID as described in
 * Microsoft, Hayes: "Plug and Play External COM Device Specification,
 * rev 1.00", 1995.
 *
 * The routine does not fully implement the COM Enumerator as par Section
 * 2.1 of the document.  In particular, we don't have idle state in which
 * the driver software monitors the com port for dynamic connection or
 * removal of a device at the port, because `msconvd' simply quits if no
 * device is found.
 *
 * In addition, as PnP COM device enumeration procedure slightly has
 * changed since its first publication, devices which follow earlier
 * revisions of the above spec. may fail to respond if the rev 1.0
 * procedure is used. XXX
 */
static bool
pnpwakeup1(void)
{
    struct timeval timeout;
    fd_set fds;
    int i;

    /*
     * This is the procedure described in rev 1.0 of PnP COM device spec.
     * Unfortunately, some devices which comform to earlier revisions of
     * the spec gets confused and do not return the ID string...
     */
    debug("PnP COM device rev 1.0 probe...");

    /* port initialization (2.1.2) */
    ioctl(rodent.mfd, TIOCMGET, &i);
    i |= TIOCM_DTR;             /* DTR = 1 */
    i &= ~TIOCM_RTS;            /* RTS = 0 */
    ioctl(rodent.mfd, TIOCMSET, &i);
    usleep(240000);

    /*
     * The PnP COM device spec. dictates that the mouse must set DSR
     * in response to DTR (by hardware or by software) and that if DSR is
     * not asserted, the host computer should think that there is no device
     * at this serial port.  But some mice just don't do that...
     */
    ioctl(rodent.mfd, TIOCMGET, &i);
    debug("modem status 0%o", i);
    if ((i & TIOCM_DSR) == 0)
        return (false);

    /* port setup, 1st phase (2.1.3) */
    setmousespeed(1200, 1200, (CS7 | CREAD | CLOCAL | HUPCL));
    i = TIOCM_DTR | TIOCM_RTS;  /* DTR = 0, RTS = 0 */
    ioctl(rodent.mfd, TIOCMBIC, &i);
    usleep(240000);
    i = TIOCM_DTR;              /* DTR = 1, RTS = 0 */
    ioctl(rodent.mfd, TIOCMBIS, &i);
    usleep(240000);

    /* wait for response, 1st phase (2.1.4) */
    i = FREAD;
    ioctl(rodent.mfd, TIOCFLUSH, &i);
    i = TIOCM_RTS;              /* DTR = 1, RTS = 1 */
    ioctl(rodent.mfd, TIOCMBIS, &i);

    /* try to read something */
    FD_ZERO(&fds);
    FD_SET(rodent.mfd, &fds);
    timeout.tv_sec = 0;
    timeout.tv_usec = 240000;
    if (select(FD_SETSIZE, &fds, NULL, NULL, &timeout) > 0) {
        debug("pnpwakeup1(): valid response in first phase.");
        return (true);
    }

    /* port setup, 2nd phase (2.1.5) */
    i = TIOCM_DTR | TIOCM_RTS;  /* DTR = 0, RTS = 0 */
    ioctl(rodent.mfd, TIOCMBIC, &i);
    usleep(240000);

    /* wait for respose, 2nd phase (2.1.6) */
    i = FREAD;
    ioctl(rodent.mfd, TIOCFLUSH, &i);
    i = TIOCM_DTR | TIOCM_RTS;  /* DTR = 1, RTS = 1 */
    ioctl(rodent.mfd, TIOCMBIS, &i);

    /* try to read something */
    FD_ZERO(&fds);
    FD_SET(rodent.mfd, &fds);
    timeout.tv_sec = 0;
    timeout.tv_usec = 240000;
    if (select(FD_SETSIZE, &fds, NULL, NULL, &timeout) > 0) {
        debug("pnpwakeup1(): valid response in second phase.");
        return (true);
    }

    return (false);
}

static bool
pnpwakeup2(void)
{
    struct timeval timeout;
    fd_set fds;
    int i;

    /*
     * This is a simplified procedure; it simply toggles RTS.
     */
    debug("alternate probe...");

    ioctl(rodent.mfd, TIOCMGET, &i);
    i |= TIOCM_DTR;             /* DTR = 1 */
    i &= ~TIOCM_RTS;            /* RTS = 0 */
    ioctl(rodent.mfd, TIOCMSET, &i);
    usleep(240000);

    setmousespeed(1200, 1200, (CS7 | CREAD | CLOCAL | HUPCL));

    /* wait for respose */
    i = FREAD;
    ioctl(rodent.mfd, TIOCFLUSH, &i);
    i = TIOCM_DTR | TIOCM_RTS;  /* DTR = 1, RTS = 1 */
    ioctl(rodent.mfd, TIOCMBIS, &i);

    /* try to read something */
    FD_ZERO(&fds);
    FD_SET(rodent.mfd, &fds);
    timeout.tv_sec = 0;
    timeout.tv_usec = 240000;
    if (select(FD_SETSIZE, &fds, NULL, NULL, &timeout) > 0) {
        debug("pnpwakeup2(): valid response.");
        return (true);
    }

    return (false);
}

static int
pnpgets(char *buf)
{
    struct timeval timeout;
    fd_set fds;
    int begin;
    int i;
    char c;

    if (!pnpwakeup1() && !pnpwakeup2()) {
        /*
         * According to PnP spec, we should set DTR = 1 and RTS = 0 while
         * in idle state.  But, `msconvd' shall set DTR = RTS = 1 and proceed,
         * assuming there is something at the port even if it didn't
         * respond to the PnP enumeration procedure.
         */
        i = TIOCM_DTR | TIOCM_RTS;              /* DTR = 1, RTS = 1 */
        ioctl(rodent.mfd, TIOCMBIS, &i);
        return (0);
    }

    /* collect PnP COM device ID (2.1.7) */
    begin = -1;
    i = 0;
    usleep(240000);     /* the mouse must send `Begin ID' within 200msec */
    while (read(rodent.mfd, &c, 1) == 1) {
        /* we may see "M", or "M3..." before `Begin ID' */
        buf[i++] = c;
        if ((c == 0x08) || (c == 0x28)) {       /* Begin ID */
            debug("begin-id %02x", c);
            begin = i - 1;
            break;
        }
        debug("%c %02x", c, c);
        if (i >= 256)
            break;
    }
    if (begin < 0) {
        /* we haven't seen `Begin ID' in time... */
        goto connect_idle;
    }

    ++c;                        /* make it `End ID' */
    for (;;) {
        FD_ZERO(&fds);
        FD_SET(rodent.mfd, &fds);
        timeout.tv_sec = 0;
        timeout.tv_usec = 240000;
        if (select(FD_SETSIZE, &fds, NULL, NULL, &timeout) <= 0)
            break;

        read(rodent.mfd, &buf[i], 1);
        if (buf[i++] == c)      /* End ID */
            break;
        if (i >= 256)
            break;
    }
    if (begin > 0) {
        i -= begin;
        bcopy(&buf[begin], &buf[0], i);
    }
    /* string may not be human readable... */
    debug("len:%d, '%-*.*s'", i, i, i, buf);

    if (buf[i - 1] == c)
        return (i);             /* a valid PnP string */

    /*
     * According to PnP spec, we should set DTR = 1 and RTS = 0 while
     * in idle state.  But, `msconvd' shall leave the modem control lines
     * as they are. See above.
     */
connect_idle:

    /* we may still have something in the buffer */
    return (MAX(i, 0));
}

static bool
pnpparse(pnpid_t *id, char *buf, int len)
{
    char s[3];
    int offset;
    int sum = 0;
    int i, j;

    id->revision = 0;
    id->eisaid = NULL;
    id->serial = NULL;
    id->class = NULL;
    id->compat = NULL;
    id->description = NULL;
    id->neisaid = 0;
    id->nserial = 0;
    id->nclass = 0;
    id->ncompat = 0;
    id->ndescription = 0;

    if ((buf[0] != 0x28) && (buf[0] != 0x08)) {
        /* non-PnP mice */
        switch(buf[0]) {
        default:
            return (false);
        case 'M': /* Microsoft */
            id->eisaid = "PNP0F01";
            break;
        case 'H': /* MouseSystems */
            id->eisaid = "PNP0F04";
            break;
        }
        id->neisaid = strlen(id->eisaid);
        id->class = "MOUSE";
        id->nclass = strlen(id->class);
        debug("non-PnP mouse '%c'", buf[0]);
        return (true);
    }

    /* PnP mice */
    offset = 0x28 - buf[0];

    /* calculate checksum */
    for (i = 0; i < len - 3; ++i) {
        sum += buf[i];
        buf[i] += offset;
    }
    sum += buf[len - 1];
    for (; i < len; ++i)
        buf[i] += offset;
    debug("PnP ID string: '%*.*s'", len, len, buf);

    /* revision */
    buf[1] -= offset;
    buf[2] -= offset;
    id->revision = ((buf[1] & 0x3f) << 6) | (buf[2] & 0x3f);
    debug("PnP rev %d.%02d", id->revision / 100, id->revision % 100);

    /* EISA vendor and product ID */
    id->eisaid = &buf[3];
    id->neisaid = 7;

    /* option strings */
    i = 10;
    if (buf[i] == '\\') {
        /* device serial # */
        for (j = ++i; i < len; ++i) {
            if (buf[i] == '\\')
                break;
        }
        if (i >= len)
            i -= 3;
        if (i - j == 8) {
            id->serial = &buf[j];
            id->nserial = 8;
        }
    }
    if (buf[i] == '\\') {
        /* PnP class */
        for (j = ++i; i < len; ++i) {
            if (buf[i] == '\\')
                break;
        }
        if (i >= len)
            i -= 3;
        if (i > j + 1) {
            id->class = &buf[j];
            id->nclass = i - j;
        }
    }
    if (buf[i] == '\\') {
        /* compatible driver */
        for (j = ++i; i < len; ++i) {
            if (buf[i] == '\\')
                break;
        }
        /*
         * PnP COM spec prior to v0.96 allowed '*' in this field,
         * it's not allowed now; just ignore it.
         */
        if (buf[j] == '*')
            ++j;
        if (i >= len)
            i -= 3;
        if (i > j + 1) {
            id->compat = &buf[j];
            id->ncompat = i - j;
        }
    }
    if (buf[i] == '\\') {
        /* product description */
        for (j = ++i; i < len; ++i) {
            if (buf[i] == ';')
                break;
        }
        if (i >= len)
            i -= 3;
        if (i > j + 1) {
            id->description = &buf[j];
            id->ndescription = i - j;
        }
    }

    /* checksum exists if there are any optional fields */
    if ((id->nserial > 0) || (id->nclass > 0)
        || (id->ncompat > 0) || (id->ndescription > 0)) {
        debug("PnP checksum: 0x%X", sum);
        sprintf(s, "%02X", sum & 0x0ff);
        if (strncmp(s, &buf[len - 3], 2) != 0) {
#if 0
            /*
             * I found some mice do not comply with the PnP COM device
             * spec regarding checksum... XXX
             */
            logwarnx("PnP checksum error", 0);
            return (false);
#endif
        }
    }

    return (true);
}

static symtab_t *
pnpproto(pnpid_t *id)
{
    symtab_t *t;
    int i, j;

    if (id->nclass > 0)
        if (strncmp(id->class, "MOUSE", id->nclass) != 0 &&
            strncmp(id->class, "TABLET", id->nclass) != 0)
            /* this is not a mouse! */
            return (NULL);

    if (id->neisaid > 0) {
        t = gettoken(pnpprod, id->eisaid, id->neisaid);
        if (t->val != MOUSE_PROTO_UNKNOWN)
            return (t);
    }

    /*
     * The 'Compatible drivers' field may contain more than one
     * ID separated by ','.
     */
    if (id->ncompat <= 0)
        return (NULL);
    for (i = 0; i < id->ncompat; ++i) {
        for (j = i; id->compat[i] != ','; ++i)
            if (i >= id->ncompat)
                break;
        if (i > j) {
            t = gettoken(pnpprod, id->compat + j, i - j);
            if (t->val != MOUSE_PROTO_UNKNOWN)
                return (t);
        }
    }

    return (NULL);
}

/* name/val mapping */

static symtab_t *
gettoken(symtab_t *tab, const char *s, int len)
{
    int i;

    for (i = 0; tab[i].name != NULL; ++i) {
        if (strncmp(tab[i].name, s, len) == 0)
            break;
    }
    return (&tab[i]);
}

static const char *
gettokenname(symtab_t *tab, int val)
{
    static const char unknown[] = "unknown";
    int i;

    for (i = 0; tab[i].name != NULL; ++i) {
        if (tab[i].val == val)
            return (tab[i].name);
    }
    return (unknown);
}

static int
gettokenval2(symtab_t *tab, int val)
{
    int i;

    for (i = 0; tab[i].name != NULL; ++i) {
        if (tab[i].val == val)
            return (tab[i].val2);
    }
    return (0);
}


/*
 * code to read from the Genius Kidspad tablet.

The tablet responds to the COM PnP protocol 1.0 with EISA-ID KYE0005,
and to pre-pnp probes (RTS toggle) with 'T' (tablet ?)
9600, 8 bit, parity odd.

The tablet puts out 5 bytes. b0 (mask 0xb8, value 0xb8) contains
the proximity, tip and button info:
   (byte0 & 0x1)        true = tip pressed
   (byte0 & 0x2)        true = button pressed
   (byte0 & 0x40)       false = pen in proximity of tablet.

The next 4 bytes are used for coordinates xl, xh, yl, yh (7 bits valid).

Only absolute coordinates are returned, so we use the following approach:
we store the last coordinates sent when the pen went out of the tablet,


 *
 */

typedef enum {
    S_IDLE, S_PROXY, S_FIRST, S_DOWN, S_UP
} k_status;

static int
kidspad(u_char rxc, mousestatus_t *act)
{
    static int buf[5];
    static int buflen = 0, b_prev = 0 , x_prev = -1, y_prev = -1;
    static k_status status = S_IDLE;
    static struct timespec now;

    int x, y;

    if (buflen > 0 && (rxc & 0x80)) {
        fprintf(stderr, "invalid code %d 0x%x\n", buflen, rxc);
        buflen = 0;
    }
    if (buflen == 0 && (rxc & 0xb8) != 0xb8) {
        fprintf(stderr, "invalid code 0 0x%x\n", rxc);
        return (0);     /* invalid code, no action */
    }
    buf[buflen++] = rxc;
    if (buflen < 5)
        return (0);

    buflen = 0; /* for next time... */

    x = buf[1]+128*(buf[2] - 7);
    if (x < 0) x = 0;
    y = 28*128 - (buf[3] + 128* (buf[4] - 7));
    if (y < 0) y = 0;

    x /= 8;
    y /= 8;

    act->flags = 0;
    act->obutton = act->button;
    act->dx = act->dy = act->dz = 0;
    clock_gettime(CLOCK_MONOTONIC_FAST, &now);
    if (buf[0] & 0x40) /* pen went out of reach */
        status = S_IDLE;
    else if (status == S_IDLE) { /* pen is newly near the tablet */
        act->flags |= MOUSE_POSCHANGED; /* force update */
        status = S_PROXY;
        x_prev = x;
        y_prev = y;
    }
    act->dx = x - x_prev;
    act->dy = y - y_prev;
    if (act->dx || act->dy)
        act->flags |= MOUSE_POSCHANGED;
    x_prev = x;
    y_prev = y;
    if (b_prev != 0 && b_prev != buf[0]) { /* possibly record button change */
        act->button = 0;
        if (buf[0] & 0x01) /* tip pressed */
            act->button |= MOUSE_BUTTON1DOWN;
        if (buf[0] & 0x02) /* button pressed */
            act->button |= MOUSE_BUTTON2DOWN;
        act->flags |= MOUSE_BUTTONSCHANGED;
    }
    b_prev = buf[0];
    return (act->flags);
}

static int
gtco_digipad (u_char rxc, mousestatus_t *act)
{
        static u_char buf[5];
        static int buflen = 0, b_prev = 0 , x_prev = -1, y_prev = -1;
        static k_status status = S_IDLE;
        int x, y;

#define GTCO_HEADER     0x80
#define GTCO_PROXIMITY  0x40
#define GTCO_START      (GTCO_HEADER|GTCO_PROXIMITY)
#define GTCO_BUTTONMASK 0x3c


        if (buflen > 0 && ((rxc & GTCO_HEADER) != GTCO_HEADER)) {
                fprintf(stderr, "invalid code %d 0x%x\n", buflen, rxc);
                buflen = 0;
        }
        if (buflen == 0 && (rxc & GTCO_START) != GTCO_START) {
                fprintf(stderr, "invalid code 0 0x%x\n", rxc);
                return (0);     /* invalid code, no action */
        }

        buf[buflen++] = rxc;
        if (buflen < 5)
                return (0);

        buflen = 0;     /* for next time... */

        x = ((buf[2] & ~GTCO_START) << 6 | (buf[1] & ~GTCO_START));
        y = 4768 - ((buf[4] & ~GTCO_START) << 6 | (buf[3] & ~GTCO_START));

        x /= 2.5;
        y /= 2.5;

        act->flags = 0;
        act->obutton = act->button;
        act->dx = act->dy = act->dz = 0;

        if ((buf[0] & 0x40) == 0) /* pen went out of reach */
                status = S_IDLE;
        else if (status == S_IDLE) { /* pen is newly near the tablet */
                act->flags |= MOUSE_POSCHANGED; /* force update */
                status = S_PROXY;
                x_prev = x;
                y_prev = y;
        }

        act->dx = x - x_prev;
        act->dy = y - y_prev;
        if (act->dx || act->dy)
                act->flags |= MOUSE_POSCHANGED;
        x_prev = x;
        y_prev = y;

        /* possibly record button change */
        if (b_prev != 0 && b_prev != buf[0]) {
                act->button = 0;
                if (buf[0] & 0x04) {
                        /* tip pressed/yellow */
                        act->button |= MOUSE_BUTTON1DOWN;
                }
                if (buf[0] & 0x08) {
                        /* grey/white */
                        act->button |= MOUSE_BUTTON2DOWN;
                }
                if (buf[0] & 0x10) {
                        /* black/green */
                        act->button |= MOUSE_BUTTON3DOWN;
                }
                if (buf[0] & 0x20) {
                        /* tip+grey/blue */
                        act->button |= MOUSE_BUTTON4DOWN;
                }
                act->flags |= MOUSE_BUTTONSCHANGED;
        }
        b_prev = buf[0];
        return (act->flags);
}

static void
mremote_serversetup(void)
{
    struct sockaddr_un ad;

    /* Open a UNIX domain stream socket to listen for mouse remote clients */
    unlink(_PATH_MOUSEREMOTE);

    if ((rodent.mremsfd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
        logerrx(1, "unable to create unix domain socket %s",_PATH_MOUSEREMOTE);

    umask(0111);

    bzero(&ad, sizeof(ad));
    ad.sun_family = AF_UNIX;
    strcpy(ad.sun_path, _PATH_MOUSEREMOTE);
#ifndef SUN_LEN
#define SUN_LEN(unp) (((char *)(unp)->sun_path - (char *)(unp)) + \
                       strlen((unp)->path))
#endif
    if (bind(rodent.mremsfd, (struct sockaddr *) &ad, SUN_LEN(&ad)) < 0)
        logerrx(1, "unable to bind unix domain socket %s", _PATH_MOUSEREMOTE);

    listen(rodent.mremsfd, 1);
}

static void
mremote_clientchg(bool add)
{
    struct sockaddr_un ad;
    socklen_t ad_len;
    int fd;

    if (rodent.rtype != MOUSE_PROTO_X10MOUSEREM)
        return;

    if (add) {
        /*  Accept client connection, if we don't already have one  */
        ad_len = sizeof(ad);
        fd = accept(rodent.mremsfd, (struct sockaddr *) &ad, &ad_len);
        if (fd < 0)
            logwarnx("failed accept on mouse remote socket");

        if (rodent.mremcfd < 0) {
            rodent.mremcfd = fd;
            debug("remote client connect...accepted");
        }
        else {
            close(fd);
            debug("another remote client connect...disconnected");
        }
    }
    else {
        /* Client disconnected */
        debug("remote client disconnected");
        close(rodent.mremcfd);
        rodent.mremcfd = -1;
    }
}