comm.c

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/***************************************************************************
 *  Original Diku Mud copyright (C) 1990, 1991 by Sebastian Hammer,        *
 *  Michael Seifert, Hans Henrik Strfeldt, Tom Madsen, and Katja Nyboe.    *
 *                                                                         *
 *  Merc Diku Mud improvments copyright (C) 1992, 1993 by Michael          *
 *  Chastain, Michael Quan, and Mitchell Tse.                              *
 *                                                                         *
 *  In order to use any part of this Merc Diku Mud, you must comply with   *
 *  both the original Diku license in 'license.doc' as well the Merc       *
 *  license in 'license.txt'.  In particular, you may not remove either of *
 *  these copyright notices.                                               *
 *                                                                         *
 *  Thanks to abaddon for proof-reading our comm.c and pointing out bugs.  *
 *  Any remaining bugs are, of course, our work, not his.  :)              *
 *                                                                         *
 *  Much time and thought has gone into this software and you are          *
 *  benefitting.  We hope that you share your changes too.  What goes      *
 *  around, comes around.                                                  *
 ***************************************************************************/

/***************************************************************************
*    ROM 2.4 is copyright 1993-1998 Russ Taylor                             *
*    ROM has been brought to you by the ROM consortium                      *
*        Russ Taylor (rtaylor@hypercube.org)                                *
*        Gabrielle Taylor (gtaylor@hypercube.org)                           *
*        Brian Moore (zump@rom.org)                                         *
*    By using this code, you have agreed to follow the terms of the         *
*    ROM license, in the file Rom24/doc/rom.license                         *
****************************************************************************/

/*
 * This file contains all of the OS-dependent stuff:
 *   startup, signals, BSD sockets for tcp/ip, i/o, timing.
 *
 * The data flow for input is:
 *    Game_loop ---> Read_from_descriptor ---> Read
 *    Game_loop ---> Read_from_buffer
 *
 * The data flow for output is:
 *    Game_loop ---> Process_Output ---> Write_to_descriptor -> Write
 *
 * The OS-dependent functions are Read_from_descriptor and Write_to_descriptor.
 * -- Furey  26 Jan 1993
 */

#if defined(macintosh)
#include <types.h>
#else
#include <sys/types.h>
#include <sys/time.h>
#endif

#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <signal.h>
#include <unistd.h>                /* OLC -- for close read write etc */
#include <stdarg.h>                /* printf_to_char */

#include "merc.h"
#include "interp.h"
#include "recycle.h"
#include "tables.h"

/*
 * Malloc debugging stuff.
 */
#if defined(sun)
#undef MALLOC_DEBUG
#endif

#if defined(MALLOC_DEBUG)
#include <malloc.h>
extern int malloc_debug args ((int));
extern int malloc_verify args ((void));
#endif



/*
 * Signal handling.
 * Apollo has a problem with __attribute(atomic) in signal.h,
 *   I dance around it.
 */
#if defined(apollo)
#define __attribute(x)
#endif

#if defined(unix)
#include <signal.h>
#endif

#if defined(apollo)
#undef __attribute
#endif



/*
 * Socket and TCP/IP stuff.
 */
#if    defined(macintosh) || defined(MSDOS)
const char echo_off_str[] = { '\0' };
const char echo_on_str[] = { '\0' };
const char go_ahead_str[] = { '\0' };
#endif

#if    defined(unix)
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "telnet.h"
const char echo_off_str[] = { IAC, WILL, TELOPT_ECHO, '\0' };
const char echo_on_str[] = { IAC, WONT, TELOPT_ECHO, '\0' };
const char go_ahead_str[] = { IAC, GA, '\0' };
#endif



/*
 * OS-dependent declarations.
 */
#if    defined(_AIX)
#include <sys/select.h>
int accept args ((int s, struct sockaddr * addr, int *addrlen));
int bind args ((int s, struct sockaddr * name, int namelen));
void bzero args ((char *b, int length));
int getpeername args ((int s, struct sockaddr * name, int *namelen));
int getsockname args ((int s, struct sockaddr * name, int *namelen));
int gettimeofday args ((struct timeval * tp, struct timezone * tzp));
int listen args ((int s, int backlog));
int setsockopt args ((int s, int level, int optname, void *optval,
                      int optlen));
int socket args ((int domain, int type, int protocol));
#endif

#if    defined(apollo)
#include <unistd.h>
void bzero args ((char *b, int length));
#endif

#if    defined(__hpux)
int accept args ((int s, void *addr, int *addrlen));
int bind args ((int s, const void *addr, int addrlen));
void bzero args ((char *b, int length));
int getpeername args ((int s, void *addr, int *addrlen));
int getsockname args ((int s, void *name, int *addrlen));
int gettimeofday args ((struct timeval * tp, struct timezone * tzp));
int listen args ((int s, int backlog));
int setsockopt args ((int s, int level, int optname,
                      const void *optval, int optlen));
int socket args ((int domain, int type, int protocol));
#endif

#if    defined(interactive)
#include <net/errno.h>
#include <sys/fnctl.h>
#endif

#if    defined(linux)
/* 
    Linux shouldn't need these. If you have a problem compiling, try
    uncommenting these functions.
*/
/*
int    accept        args( ( int s, struct sockaddr *addr, int *addrlen ) );
int    bind        args( ( int s, struct sockaddr *name, int namelen ) );
int    getpeername    args( ( int s, struct sockaddr *name, int *namelen ) );
int    getsockname    args( ( int s, struct sockaddr *name, int *namelen ) );
int    listen        args( ( int s, int backlog ) );
*/

int close args ((int fd));
int gettimeofday args ((struct timeval * tp, struct timezone * tzp));
/* int    read        args( ( int fd, char *buf, int nbyte ) ); */
int select args ((int width, fd_set * readfds, fd_set * writefds,
                  fd_set * exceptfds, struct timeval * timeout));
int socket args ((int domain, int type, int protocol));
/* int    write        args( ( int fd, char *buf, int nbyte ) ); *//* read,write in unistd.h */
#endif

#if    defined(macintosh)
#include <console.h>
#include <fcntl.h>
#include <unix.h>
struct timeval {
    time_t tv_sec;
    time_t tv_usec;
};
#if    !defined(isascii)
#define    isascii(c)        ( (c) < 0200 )
#endif
static long theKeys[4];

int gettimeofday args ((struct timeval * tp, void *tzp));
#endif

#if    defined(MIPS_OS)
extern int errno;
#endif

#if    defined(MSDOS)
int gettimeofday args ((struct timeval * tp, void *tzp));
int kbhit args ((void));
#endif

#if    defined(NeXT)
int close args ((int fd));
int fcntl args ((int fd, int cmd, int arg));
#if    !defined(htons)
u_short htons args ((u_short hostshort));
#endif
#if    !defined(ntohl)
u_long ntohl args ((u_long hostlong));
#endif
int read args ((int fd, char *buf, int nbyte));
int select args ((int width, fd_set * readfds, fd_set * writefds,
                  fd_set * exceptfds, struct timeval * timeout));
int write args ((int fd, char *buf, int nbyte));
#endif

#if    defined(sequent)
int accept args ((int s, struct sockaddr * addr, int *addrlen));
int bind args ((int s, struct sockaddr * name, int namelen));
int close args ((int fd));
int fcntl args ((int fd, int cmd, int arg));
int getpeername args ((int s, struct sockaddr * name, int *namelen));
int getsockname args ((int s, struct sockaddr * name, int *namelen));
int gettimeofday args ((struct timeval * tp, struct timezone * tzp));
#if    !defined(htons)
u_short htons args ((u_short hostshort));
#endif
int listen args ((int s, int backlog));
#if    !defined(ntohl)
u_long ntohl args ((u_long hostlong));
#endif
int read args ((int fd, char *buf, int nbyte));
int select args ((int width, fd_set * readfds, fd_set * writefds,
                  fd_set * exceptfds, struct timeval * timeout));
int setsockopt args ((int s, int level, int optname, caddr_t optval,
                      int optlen));
int socket args ((int domain, int type, int protocol));
int write args ((int fd, char *buf, int nbyte));
#endif

/* This includes Solaris Sys V as well */
#if defined(sun)
int accept args ((int s, struct sockaddr * addr, int *addrlen));
int bind args ((int s, struct sockaddr * name, int namelen));
void bzero args ((char *b, int length));
int close args ((int fd));
int getpeername args ((int s, struct sockaddr * name, int *namelen));
int getsockname args ((int s, struct sockaddr * name, int *namelen));
int listen args ((int s, int backlog));
int read args ((int fd, char *buf, int nbyte));
int select args ((int width, fd_set * readfds, fd_set * writefds,
                  fd_set * exceptfds, struct timeval * timeout));

#if !defined(__SVR4)
int gettimeofday args ((struct timeval * tp, struct timezone * tzp));

#if defined(SYSV)
int setsockopt args ((int s, int level, int optname,
                      const char *optval, int optlen));
#else
int setsockopt args ((int s, int level, int optname, void *optval,
                      int optlen));
#endif
#endif
int socket args ((int domain, int type, int protocol));
int write args ((int fd, char *buf, int nbyte));
#endif

#if defined(ultrix)
int accept args ((int s, struct sockaddr * addr, int *addrlen));
int bind args ((int s, struct sockaddr * name, int namelen));
void bzero args ((char *b, int length));
int close args ((int fd));
int getpeername args ((int s, struct sockaddr * name, int *namelen));
int getsockname args ((int s, struct sockaddr * name, int *namelen));
int gettimeofday args ((struct timeval * tp, struct timezone * tzp));
int listen args ((int s, int backlog));
int read args ((int fd, char *buf, int nbyte));
int select args ((int width, fd_set * readfds, fd_set * writefds,
                  fd_set * exceptfds, struct timeval * timeout));
int setsockopt args ((int s, int level, int optname, void *optval,
                      int optlen));
int socket args ((int domain, int type, int protocol));
int write args ((int fd, char *buf, int nbyte));
#endif



/*
 * Global variables.
 */
DESCRIPTOR_DATA *descriptor_list;    /* All open descriptors     */
DESCRIPTOR_DATA *d_next;        /* Next descriptor in loop  */
FILE *fpReserve;                /* Reserved file handle     */
bool god;                        /* All new chars are gods!  */
bool merc_down;                    /* Shutdown         */
bool global_peace;      /* Peace to stop all fighting */
bool is_building_area;      /* lock so I wont copyover now while
                   people are building. */
bool isAreaPort;

bool wizlock;                    /* Game is wizlocked        */
bool isCopyover;
int Copyovercount=3;
CHAR_DATA * CopyoverPerson;
char *CopyoverReason;
bool newlock;                    /* Game is newlocked        */
char str_boot_time[MAX_INPUT_LENGTH];
time_t current_time;            /* time of this pulse */
bool MOBtrigger = TRUE;            /* act() switch                 */
bool just_rained;

/*
 * OS-dependent local functions.
 */
#if defined(macintosh) || defined(MSDOS)
void game_loop_mac_msdos args ((void));
bool read_from_descriptor args ((DESCRIPTOR_DATA * d));
bool write_to_descriptor args ((int desc, char *txt, int length));
#endif

#if defined(unix)
void game_loop_unix args ((int control));
int init_socket args ((int port));
void init_descriptor args ((int control));
bool read_from_descriptor args ((DESCRIPTOR_DATA * d));
bool write_to_descriptor args ((int desc, char *txt, int length));
#endif




/*
 * Other local functions (OS-independent).
 */
bool check_parse_name args ((char *name));
bool check_reconnect args ((DESCRIPTOR_DATA * d, char *name, bool fConn));
bool check_playing args ((DESCRIPTOR_DATA * d, char *name));
int main args ((int argc, char **argv));
void nanny args ((DESCRIPTOR_DATA * d, char *argument));
bool process_output args ((DESCRIPTOR_DATA * d, bool fPrompt));
void read_from_buffer args ((DESCRIPTOR_DATA * d));
void stop_idling args ((CHAR_DATA * ch));
void bust_a_prompt args ((CHAR_DATA * ch));

void send_to_all_copyover args ((char *argument));
void send_to_all args ((char *cch, char *argument));
/* Needs to be global because of do_copyover */
int port, control;

/* Put global mud config values here. Look at qmconfig command for clues.     */
/*   -- JR 09/23/2000                                                         */
/* Set values for all but IP address in ../area/qmconfig.rc file.             */
/*   -- JR 05/10/2001                                                         */
int mud_ansiprompt, mud_ansicolor, mud_telnetga;

/* Set this to the IP address you want to listen on (127.0.0.1 is good for    */
/* paranoid types who don't want the 'net at large peeking at their MUD)      */
char *mud_ipaddress = "0.0.0.0";
bool fCopyOver = FALSE;
int main (int argc, char **argv)
{
    struct timeval now_time;
    

    /*
     * Memory debugging if needed.
     */
#if defined(MALLOC_DEBUG)
    malloc_debug (2);
#endif

    /*
     * Init time.
     */
    gettimeofday (&now_time, NULL);
    current_time = (time_t) now_time.tv_sec;
    strcpy (str_boot_time, ctime (&current_time));

    /*
     * Macintosh console initialization.
     */
#if defined(macintosh)
    console_options.nrows = 31;
    cshow (stdout);
    csetmode (C_RAW, stdin);
    cecho2file ("log file", 1, stderr);
#endif

    /*
     * Reserve one channel for our use.
     */
    if ((fpReserve = fopen (NULL_FILE, "r")) == NULL)
    {
        perror (NULL_FILE);
        exit (1);
    }

    /*
     * Get the port number.
     */
    port = 4000;
    if (argc > 1)
    {
        if (!is_number (argv[1]))
        {
            fprintf (stderr, "Usage: %s [port #]\n", argv[0]);
            exit (1);
        }
        else if ((port = atoi (argv[1])) <= 1024)
        {
            fprintf (stderr, "Port number must be above 1024.\n");
            exit (1);
        }

        /* Are we recovering from a copyover? */
        if (argv[2] && argv[2][0])
        {
            logf("We're copyovering?");
        fCopyOver = TRUE;
            control = atoi (argv[3]);
        }
        else
            fCopyOver = FALSE;

    }
    logf("port: %d", port);

    /*
     * Run the game.
     */
#if defined(macintosh) || defined(MSDOS)
    qmconfig_read(); /* Here because it fits, no conflicts with Linux placement -- JR 05/06/01 */
    boot_db ();
    log_string ("Merc is ready to rock.");
    game_loop_mac_msdos ();
#endif

#if defined(unix)

    qmconfig_read(); /* Here so we can set the IP adress. -- JR 05/06/01 */
    if (!fCopyOver)
        control = init_socket (port);

    boot_db ();
    //send_to_all_copyover("Loading webserver ");
    //nit_web(80);
    //send_to_all_copyover("Done.(Non-functional)\n\r");
    logf ("ROM is ready to rock on port %d (%s).", port, mud_ipaddress);

    if (fCopyOver)
        copyover_recover ();

    game_loop_unix (control);
    save_kingdom_data();
    save_clan_data();
    save_game_conf();
    save_disabled();
    close (control);
#endif

    /*
     * That's all, folks.
     */
    log_string ("Normal termination of game.");
    exit (0);
    return 0;
}



#if defined(unix)
int init_socket (int port)
{
    static struct sockaddr_in sa_zero;
    struct sockaddr_in sa;
    int x = 1;
    int fd;

    if ((fd = socket (AF_INET, SOCK_STREAM, 0)) < 0)
    {
        perror ("Init_socket: socket");
        exit (1);
    }

    if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR,
                    (char *) &x, sizeof (x)) < 0)
    {
        perror ("Init_socket: SO_REUSEADDR");
        close (fd);
        exit (1);
    }

#if defined(SO_DONTLINGER) && !defined(SYSV)
    {
        struct linger ld;

        ld.l_onoff = 1;
        ld.l_linger = 1000;

        if (setsockopt (fd, SOL_SOCKET, SO_DONTLINGER,
                        (char *) &ld, sizeof (ld)) < 0)
        {
            perror ("Init_socket: SO_DONTLINGER");
            close (fd);
            exit (1);
        }
    }
#endif

    sa = sa_zero;
    sa.sin_family = AF_INET;
    sa.sin_port = htons (port);
    sa.sin_addr.s_addr = inet_addr( mud_ipaddress );
    logf("Set IP address to %s", mud_ipaddress);

    if (bind (fd, (struct sockaddr *) &sa, sizeof (sa)) < 0)
    {
        perror ("Init socket: bind");
        close (fd);
        exit (1);
    }


    if (listen (fd, 3) < 0)
    {
        perror ("Init socket: listen");
        close (fd);
        exit (1);
    }

    return fd;
}
#endif



#if defined(macintosh) || defined(MSDOS)
void game_loop_mac_msdos (void)
{
    struct timeval last_time;
    struct timeval now_time;
    static DESCRIPTOR_DATA dcon;

    gettimeofday (&last_time, NULL);
    current_time = (time_t) last_time.tv_sec;

    /*
     * New_descriptor analogue.
     */
    dcon.descriptor = 0;
    if (!mud_ansiprompt)
    //dcon.connected = CON_GET_NAME;
    dcon.connected = CON_SHOW_LOGIN;
    else
        dcon.connected = CON_ANSI;
    dcon.ansi = mud_ansicolor;
    dcon.host = str_dup ("localhost");
    dcon.outsize = 2000;
    dcon.outbuf = alloc_mem (dcon.outsize);
    dcon.next = descriptor_list;
    dcon.showstr_head = NULL;
    dcon.showstr_point = NULL;
    dcon.pEdit = NULL;            /* OLC */
    dcon.pString = NULL;        /* OLC */
    dcon.editor = 0;            /* OLC */
    descriptor_list = &dcon;

    /*
     * First Contact!
     */
    if (!mud_ansiprompt)
    {
        extern char * help_greeting;
        if ( help_greeting[0] == '.' )
            send_to_desc ( help_greeting+1, &dcon );
        else
            send_to_desc ( help_greeting  , &dcon );
    }

    else
        write_to_buffer (&dcon, "Do you want Colour? (Y/n) ", 0);

    /* Main loop */
    while (!merc_down)
    {
        DESCRIPTOR_DATA *d;

        /*
         * Process input.
         */
        for (d = descriptor_list; d != NULL; d = d_next)
        {
            d_next = d->next;
            d->fcommand = FALSE;

#if defined(MSDOS)
            if (kbhit ())
#endif
            {
                if (d->character != NULL)
                    d->character->timer = 0;
                if (!read_from_descriptor (d))
                {
                    if (d->character != NULL && d->connected == CON_PLAYING)
                        save_char_obj (d->character);
                    d->outtop = 0;
                    close_socket (d);
                    continue;
                }
            }

            if (d->character != NULL && d->character->daze > 0)
                --d->character->daze;

            if (d->character != NULL && d->character->wait > 0)
            {
                --d->character->wait;
                continue;
            }

            read_from_buffer (d);
            if (d->incomm[0] != '\0')
            {
                d->fcommand = TRUE;
                stop_idling (d->character);

                /* OLC */
                if (d->showstr_point)
                    show_string (d, d->incomm);
                else if (d->pString)
                    string_add (d->character, d->incomm);
                else
                    switch (d->connected)
                    {
                        case CON_PLAYING:
                            if (!run_olc_editor (d))
                                substitute_alias (d, d->incomm);
                            break;
                        default:
                            send_to_decriptor("Test.\n\r",d);
                nanny (d, d->incomm);
                            break;
                    }

                d->incomm[0] = '\0';
            }
        }



        /*
         * Autonomous game motion.
         */
        update_handler ();



        /*
         * Output.
         */
        for (d = descriptor_list; d != NULL; d = d_next)
        {
            d_next = d->next;

            if ((d->fcommand || d->outtop > 0))
            {
                if (!process_output (d, TRUE))
                {
                    if (d->character != NULL && d->connected == CON_PLAYING)
                        save_char_obj (d->character);
                    d->outtop = 0;
                    close_socket (d);
                }
            }
        }



        /*
         * Synchronize to a clock.
         * Busy wait (blargh).
         */
        now_time = last_time;
        for (;;)
        {
            int delta;

#if defined(MSDOS)
            if (kbhit ())
#endif
            {
                if (dcon.character != NULL)
                    dcon.character->timer = 0;
                if (!read_from_descriptor (&dcon))
                {
                    if (dcon.character != NULL && d->connected == CON_PLAYING)
                        save_char_obj (d->character);
                    dcon.outtop = 0;
                    close_socket (&dcon);
                }
#if defined(MSDOS)
                break;
#endif
            }

            gettimeofday (&now_time, NULL);
            delta = (now_time.tv_sec - last_time.tv_sec) * 1000 * 1000
                + (now_time.tv_usec - last_time.tv_usec);
            if (delta >= 1000000 / PULSE_PER_SECOND)
                break;
        }
        last_time = now_time;
        current_time = (time_t) last_time.tv_sec;
    }

    return;
}
#endif



#if defined(unix)
void game_loop_unix (int control)
{
    static struct timeval null_time;
    struct timeval last_time;

    signal (SIGPIPE, SIG_IGN);
    gettimeofday (&last_time, NULL);
    current_time = (time_t) last_time.tv_sec;

    /* Main loop */
    while (!merc_down)
    {
        fd_set in_set;
        fd_set out_set;
        fd_set exc_set;
        DESCRIPTOR_DATA *d;
        int maxdesc;

#if defined(MALLOC_DEBUG)
        if (malloc_verify () != 1)
            abort ();
#endif
    if (signal(SIGINT, mud_crashing) == SIG_IGN)
        signal(SIGINT, SIG_IGN);
    if (signal(SIGHUP, mud_crashing) == SIG_IGN)
        signal(SIGHUP, SIG_IGN);
    if (signal(SIGSEGV, mud_crashing) == SIG_IGN)
        signal(SIGSEGV, mud_crashing);
    

        /*
         * Poll all active descriptors.
         */
        FD_ZERO (&in_set);
        FD_ZERO (&out_set);
        FD_ZERO (&exc_set);
        FD_SET (control, &in_set);
        maxdesc = control;
        for (d = descriptor_list; d; d = d->next)
        {
            maxdesc = UMAX (maxdesc, d->descriptor);
            FD_SET (d->descriptor, &in_set);
            FD_SET (d->descriptor, &out_set);
            FD_SET (d->descriptor, &exc_set);
        }

        if (select (maxdesc + 1, &in_set, &out_set, &exc_set, &null_time) < 0)
        {
            perror ("Game_loop: select: poll");
            exit (1);
        }

        /*
         * New connection?
         */
        if (FD_ISSET (control, &in_set))
            init_descriptor (control);

        /*
         * Kick out the freaky folks.
         */
        for (d = descriptor_list; d != NULL; d = d_next)
        {
            d_next = d->next;
            if (FD_ISSET (d->descriptor, &exc_set))
            {
                FD_CLR (d->descriptor, &in_set);
                FD_CLR (d->descriptor, &out_set);
                if (d->character && d->connected == CON_PLAYING)
                    save_char_obj (d->character);
                d->outtop = 0;
                close_socket (d);
            }
        }

        /*
         * Process input.
         */
        for (d = descriptor_list; d != NULL; d = d_next)
        {
            d_next = d->next;
            d->fcommand = FALSE;

            if (FD_ISSET (d->descriptor, &in_set))
            {
                if (d->character != NULL)
                    d->character->timer = 0;
                if (!read_from_descriptor (d))
                {
                    FD_CLR (d->descriptor, &out_set);
                    if (d->character != NULL && d->connected == CON_PLAYING)
                        save_char_obj (d->character);
                    d->outtop = 0;
                    close_socket (d);
                    continue;
                }
            }

            if (d->character != NULL && d->character->daze > 0)
                --d->character->daze;

            if (d->character != NULL && d->character->wait > 0)
            {
                --d->character->wait;
                continue;
            }
        read_from_buffer(d);
        //fead_from_buffer (d);
            //send_to_desc(poo,d);

        if (d->incomm[0] != '\0')
            {
                d->fcommand = TRUE;
                stop_idling (d->character);

                /* OLC */
                if (d->showstr_point)
                    show_string (d, d->incomm);
                else if (d->pString)
                    string_add (d->character, d->incomm);
                else
                    switch (d->connected)
                    {
                        case CON_PLAYING:
                            if (!run_olc_editor (d))
                                substitute_alias (d, d->incomm);
                            break;
                        default:
                            nanny (d, d->incomm);
                            break;
                    }

                d->incomm[0] = '\0';
            }
        }



        /*
         * Autonomous game motion.
         */
        update_handler ();



        /*
         * Output.
         */
        for (d = descriptor_list; d != NULL; d = d_next)
        {
            d_next = d->next;

            if ((d->fcommand || d->outtop > 0)
                && FD_ISSET (d->descriptor, &out_set))
            {
                if (!process_output (d, TRUE))
                {
                    if (d->character != NULL && d->connected == CON_PLAYING)
                        save_char_obj (d->character);
                    d->outtop = 0;
                    close_socket (d);
                }
            }
        }



        /*
         * Synchronize to a clock.
         * Sleep( last_time + 1/PULSE_PER_SECOND - now ).
         * Careful here of signed versus unsigned arithmetic.
         */
        {
            struct timeval now_time;
            long secDelta;
            long usecDelta;

            gettimeofday (&now_time, NULL);
            usecDelta = ((int) last_time.tv_usec) - ((int) now_time.tv_usec)
                + 1000000 / PULSE_PER_SECOND;
            secDelta = ((int) last_time.tv_sec) - ((int) now_time.tv_sec);
            while (usecDelta < 0)
            {
                usecDelta += 1000000;
                secDelta -= 1;
            }

            while (usecDelta >= 1000000)
            {
                usecDelta -= 1000000;
                secDelta += 1;
            }

            if (secDelta > 0 || (secDelta == 0 && usecDelta > 0))
            {
                struct timeval stall_time;

                stall_time.tv_usec = usecDelta;
                stall_time.tv_sec = secDelta;
                if (select (0, NULL, NULL, NULL, &stall_time) < 0)
                {
                    perror ("Game_loop: select: stall");
                    exit (1);
                }
            }
        }

        gettimeofday (&last_time, NULL);
        current_time = (time_t) last_time.tv_sec;
    }

    return;
}
#endif



#if defined(unix)

void init_descriptor (int control)
{
    char buf[MAX_STRING_LENGTH];
    DESCRIPTOR_DATA *dnew;
    struct sockaddr_in sock;
    struct hostent *from;
    int desc;
    int size;

    size = sizeof (sock);
    getsockname (control, (struct sockaddr *) &sock, &size);
    if ((desc = accept (control, (struct sockaddr *) &sock, &size)) < 0)
    {
        perror ("New_descriptor: accept");
        return;
    }

#if !defined(FNDELAY)
#define FNDELAY O_NDELAY
#endif

    if (fcntl (desc, F_SETFL, FNDELAY) == -1)
    {
        perror ("New_descriptor: fcntl: FNDELAY");
        return;
    }

    /*
     * Cons a new descriptor.
     */
    dnew = new_descriptor ();

    dnew->descriptor = desc;
    if (!mud_ansiprompt)
    //  dnew->connected = CON_GET_NAME;
        dnew->connected = CON_SHOW_LOGIN;
    else
        dnew->connected = CON_ANSI;
    dnew->ansi = mud_ansicolor;
    dnew->showstr_head = NULL;
    dnew->showstr_point = NULL;
    dnew->outsize = 2000;
    dnew->pEdit = NULL;            /* OLC */
    dnew->pString = NULL;        /* OLC */
    dnew->editor = 0;            /* OLC */
    dnew->outbuf = alloc_mem (dnew->outsize);

    size = sizeof (sock);
    if (getpeername (desc, (struct sockaddr *) &sock, &size) < 0)
    {
        perror ("New_descriptor: getpeername");
        dnew->host = str_dup ("(unknown)");
    }
    else
    {
        /*
         * Would be nice to use inet_ntoa here but it takes a struct arg,
         * which ain't very compatible between gcc and system libraries.
         */
        int addr;

        addr = ntohl (sock.sin_addr.s_addr);
        sprintf (buf, "%d.%d.%d.%d",
                 (addr >> 24) & 0xFF, (addr >> 16) & 0xFF,
                 (addr >> 8) & 0xFF, (addr) & 0xFF);
        sprintf (log_buf, "Sock.sinaddr:  %s", buf);
        log_string (log_buf);
        from = gethostbyaddr ((char *) &sock.sin_addr,
                              sizeof (sock.sin_addr), AF_INET);
        dnew->host = str_dup (from ? from->h_name : buf);
    }

    /*
     * Swiftest: I added the following to ban sites.  I don't
     * endorse banning of sites, but Copper has few descriptors now
     * and some people from certain sites keep abusing access by
     * using automated 'autodialers' and leaving connections hanging.
     *
     * Furey: added suffix check by request of Nickel of HiddenWorlds.
     */
    if (check_ban (dnew->host, BAN_ALL))
    {
        write_to_descriptor (desc,
                             "Your site has been banned. If you feel this is an error, contact\n\rTribul.\n\r",
                             0);
        close (desc);
        free_descriptor (dnew);
        return;
    }
    /*
     * Init descriptor data.
     */
    dnew->next = descriptor_list;
    descriptor_list = dnew;

    /*
     * First Contact!
     */
    if (!mud_ansiprompt)
    {
        extern char * help_greeting;
        if ( help_greeting[0] == '.' )
            send_to_desc ( help_greeting+1, dnew );
        else
            send_to_desc ( help_greeting  , dnew );
    }
    else
            send_to_desc ("Do you want Colour? (Y/n) ", dnew);

    return;
}
#endif



void close_socket (DESCRIPTOR_DATA * dclose)
{
    CHAR_DATA *ch;

    if (dclose->outtop > 0)
        process_output (dclose, FALSE);

    if (dclose->snoop_by != NULL)
    {
        write_to_buffer (dclose->snoop_by,
                         "Your victim has left the game.\n\r", 0);
    }

    {
        DESCRIPTOR_DATA *d;

        for (d = descriptor_list; d != NULL; d = d->next)
        {
            if (d->snoop_by == dclose)
                d->snoop_by = NULL;
        }
    }

    if ((ch = dclose->character) != NULL)
    {
        sprintf (log_buf, "Closing link to %s.", ch->name);
        log_string (log_buf);
        /* cut down on wiznet spam when rebooting */
        /* If ch is writing note or playing, just lose link otherwise clear char */
        if ((dclose->connected == CON_PLAYING && !merc_down)
                || ((dclose->connected >= CON_NOTE_TO)
                        && (dclose->connected <= CON_NOTE_FINISH)))
        {
            act ("$n has lost $s link.", ch, NULL, NULL, TO_ROOM);
           //SET_BIT(ch->comm, WIZ_LD);
        wiznet ("Net death has claimed $N.", ch, NULL, WIZ_LINKS, 0, 0);
        SET_BIT(ch->link_status, LINK_DEAD);
            ch->desc = NULL;
        }
        else
        {
            free_char (dclose->original ? dclose->original :
                       dclose->character);
        }
    }

    if (d_next == dclose)
        d_next = d_next->next;

    if (dclose == descriptor_list)
    {
        descriptor_list = descriptor_list->next;
    }
    else
    {
        DESCRIPTOR_DATA *d;

        for (d = descriptor_list; d && d->next != dclose; d = d->next);
        if (d != NULL)
            d->next = dclose->next;
        else
            bug ("Close_socket: dclose not found.", 0);
    }

    close (dclose->descriptor);
    free_descriptor (dclose);
#if defined(MSDOS) || defined(macintosh)
    exit (1);
#endif
    return;
}



bool read_from_descriptor (DESCRIPTOR_DATA * d)
{
    int iStart;

    /* Hold horses if pending command already. */
    if (d->incomm[0] != '\0')
        return TRUE;

    /* Check for overflow. */
    iStart = strlen (d->inbuf);
    if (iStart >= sizeof (d->inbuf) - 10)
    {
        sprintf (log_buf, "%s input overflow!", d->host);
        log_string (log_buf);
        write_to_descriptor (d->descriptor,
                             "\n\r*** PUT A LID ON IT!!! ***\n\r", 0);
        return FALSE;
    }
    
    /* Snarf input. */
#if defined(macintosh)
    for (;;)
    {
        int c;
        c = getc (stdin);
        if (c == '\0' || c == EOF)
            break;
        putc (c, stdout);
        if (c == '\r')
            putc ('\n', stdout);
        d->inbuf[iStart++] = c;
        if (iStart > sizeof (d->inbuf) - 10)
            break;
    }
#endif

#if defined(MSDOS) || defined(unix)
    for (;;)
    {
        int nRead;

        nRead = read (d->descriptor, d->inbuf + iStart,
                      sizeof (d->inbuf) - 10 - iStart);
        if (nRead > 0)
        {
            iStart += nRead;
            if (d->inbuf[iStart - 1] == '\n' || d->inbuf[iStart - 1] == '\r' || d->inbuf[iStart -1] == '~')
                break;
        }
        else if (nRead == 0)
        {
            log_string ("EOF encountered on read.");
            return FALSE;
        }
        else if (errno == EWOULDBLOCK)
            break;
        else
        {
            perror ("Read_from_descriptor");
            return FALSE;
        }
    }
#endif

    d->inbuf[iStart] = '\0';
    return TRUE;
}



/*
 * Transfer one line from input buffer to input line.
 */
void read_from_buffer (DESCRIPTOR_DATA * d)
{
    int i, j, k;

    /*
     * Hold horses if pending command already.
     */
    if (d->incomm[0] != '\0')
        return;
    /*if (d->incomm[0] == '~')
     {
         d->incomm[0] = '\0';
         return;
     }
*/
     
    /*
     * Look for at least one new line.
     */
    for (i = 0; d->inbuf[i] != '\n' && d->inbuf[i] != '\r'; i++)
    {
        if (d->inbuf[i] == '\0')
            return;
    /*if (d->inbuf[i] == '~')
    {
         send_to_char("clearing command buffer.\n\r",d->character);
         d->inbuf[0] = '\0';
         return;
    }*/
                                                     
         
    }

    /*
     * Canonical input processing.
     */
    for (i = 0, k = 0; d->inbuf[i] != '\n' && d->inbuf[i] != '\r'; i++)
    {
        if (k >= MAX_INPUT_LENGTH - 2)
        {
            write_to_descriptor (d->descriptor, "Line too long.\n\r", 0);

            /* skip the rest of the line */
            for (; d->inbuf[i] != '\0'; i++)
            {
                if (d->inbuf[i] == '\n' || d->inbuf[i] == '\r')
                    break;
            }
            d->inbuf[i] = '\n';
            d->inbuf[i + 1] = '\0';
            break;
        }
      /* if (d->inbuf[i] == '~')
    {
        send_to_char("clearing command buffer.\n\r",d->character);
        d->inbuf[0] = '\0';
        return;
    }*/
        if (d->inbuf[i] == '\b' && k > 0)
            --k;
        else if (isascii (d->inbuf[i]) && isprint (d->inbuf[i]))
            d->incomm[k++] = d->inbuf[i];
    }

    /*
     * Finish off the line.
     */
    if (k == 0)
        d->incomm[k++] = ' ';
    d->incomm[k] = '\0';

    /*
     * Deal with bozos with #repeat 1000 ...
     */

    if (k > 1 || d->incomm[0] == '!')
    {
        if (d->incomm[0] != '!' && strcmp (d->incomm, d->inlast))
        {
            d->repeat = 0;
        }
        else
        {
            if (++d->repeat >= 25 && d->character
                && d->connected == CON_PLAYING)
            {
                sprintf (log_buf, "%s input spamming!", d->host);
                log_string (log_buf);
                wiznet ("Spam spam spam $N spam spam spam spam spam!",
                        d->character, NULL, WIZ_SPAM, 0,
                        get_trust (d->character));
                if (d->incomm[0] == '!')
                    wiznet (d->inlast, d->character, NULL, WIZ_SPAM, 0,
                            get_trust (d->character));
                else
                    wiznet (d->incomm, d->character, NULL, WIZ_SPAM, 0,
                            get_trust (d->character));

                d->repeat = 0;
/*
        write_to_descriptor( d->descriptor,
            "\n\r*** PUT A LID ON IT!!! ***\n\r", 0 );
        strcpy( d->incomm, "quit" );
*/
            }
        }
    }


    /*
     * Do '!' substitution.
     */
    if (d->incomm[0] == '!')
        strcpy (d->incomm, d->inlast);
    else
        strcpy (d->inlast, d->incomm);
    if (d->incomm[0] == '~')
        d->inbuf[0] = '\0';


    /*
     * Shift the input buffer.
     */
    while (d->inbuf[i] == '\n' || d->inbuf[i] == '\r')
        i++;
    for (j = 0; (d->inbuf[j] = d->inbuf[i + j]) != '\0'; j++);
    return;
}



/*
 * Low level output function.
 */
bool process_output (DESCRIPTOR_DATA * d, bool fPrompt)
{
    extern bool merc_down;
    int cnt=1;
    static char buf[MAX_STRING_LENGTH * 2];
    char tmpb[MAX_STRING_LENGTH];
    buf[0] = '\0';

    /*
     * Bust a prompt.
     */
    if (!merc_down)
    {
        if (d->showstr_point)
            send_to_char ("{x{D[{wHit Return to continue{D]{x\n\r", d->character);
        else if (fPrompt && d->pString && d->connected == CON_PLAYING)
    {
        char *string;
            string = *d->pString;
        while (*string)
        {
               string = getline (string, tmpb);
               cnt++;
               //sprintf (buf2, "{W%3d{x. {x%s\n\r", cnt++, tmpb);
               //strcat (buf, buf2);
               
        }
        sprintf(buf, "{W%3d{c>{x ", cnt);
        
           //write_to_buffer (d, /*"{c>{x "*/buf, 2);
           send_to_char(buf, d->character);
    }
    else if (fPrompt && d->connected == CON_PLAYING)
        {
            CHAR_DATA *ch;
            CHAR_DATA *victim;

            ch = d->character;

            /* battle prompt */
            
        if ((victim = ch->fighting) != NULL && can_see (ch, victim))
            {
                int percent;
                char wound[100];
                char *pbuff;
                char buf[MSL];
                char buffer[MSL*2];

                if (victim->max_hit > 0)
                    percent = victim->hit * 100 / victim->max_hit;
                else
                    percent = -1;

                if (percent >= 100)
                    sprintf (wound, "is in excellent condition.");
                else if (percent >= 90)
                    sprintf (wound, "has a few scratches.");
                else if (percent >= 75)
                    sprintf (wound, "has some small wounds and bruises.");
                else if (percent >= 50)
                    sprintf (wound, "has quite a few wounds.");
                else if (percent >= 30)
                    sprintf (wound,
                             "has some big nasty wounds and scratches.");
                else if (percent >= 15)
                    sprintf (wound, "looks pretty hurt.");
                else if (percent >= 0)
                    sprintf (wound, "is in awful condition.");
                else
                    sprintf (wound, "is bleeding to death.");

                sprintf (buf, "%s %s \n\r",
                         IS_NPC (victim) ? victim->short_descr : victim->name,
                         wound);
                buf[0] = UPPER (buf[0]);
                pbuff = buffer;
                colourconv (pbuff, buf, CH(d));
                write_to_buffer (d, buffer, 0);
            }


            ch = d->original ? d->original : d->character;
            if (!IS_SET (ch->comm, COMM_COMPACT))
                write_to_buffer (d, "\n\r", 2);


            if (IS_SET (ch->comm, COMM_PROMPT))
                bust_a_prompt (d->character);

            if (IS_SET (ch->comm, COMM_TELNET_GA))
                write_to_buffer (d, go_ahead_str, 0);
        }
    }

    /*
     * Short-circuit if nothing to write.
     */
    if (d->outtop == 0)
        return TRUE;

    /*
     * Snoop-o-rama.
     */
    if (d->snoop_by != NULL)
    {
        if (d->character != NULL)
            write_to_buffer (d->snoop_by, d->character->name, 0);
        write_to_buffer (d->snoop_by, "> ", 2);
        write_to_buffer (d->snoop_by, d->outbuf, d->outtop);
    }

    /*
     * OS-dependent output.
     */
    if (!write_to_descriptor (d->descriptor, d->outbuf, d->outtop))
    {
        d->outtop = 0;
        return FALSE;
    }
    else
    {
        d->outtop = 0;
        return TRUE;
    }
}

/*
 * Bust a prompt (player settable prompt)
 * coded by Morgenes for Aldara Mud
 */
void bust_a_prompt (CHAR_DATA * ch)
{
    char buf[MAX_STRING_LENGTH];
    char buf2[MAX_STRING_LENGTH];
    const char *str;
    const char *i;
    char *point;
    char *pbuff;
    char buffer[MAX_STRING_LENGTH * 2];
    char doors[MAX_INPUT_LENGTH];
    EXIT_DATA *pexit;
    bool found;
    const char *dir_name[] = { "N-", "E-", "S-", "W-", "U-", "D-", "Ne-", "Nw-", "Se-", "Sw" };
    int door;
    extern int port;

    point = buf;
    str = ch->prompt;
    if (str == NULL || str[0] == '\0')
    {
        sprintf (buf, "{p<%dhp %dm %dmv>{x %s",
                 ch->hit, ch->mana, ch->move, ch->prefix);
        send_to_char (buf, ch);
        return;
    }
    if (!IS_NPC(ch) && ch->desc->editor)
    {
        send_to_char("{R[{WOLC{R]{x ",ch);
    }
    if (!IS_NPC(ch) && IS_IMMORTAL(ch) && IS_SET(ch->pcdata->immortal, IMMORTAL_PORT))
    {
        
        sprintf(buf, "{r({cPort: {D%d{r){x ",port);
        send_to_char(buf,ch);
    }
        

    
    if (IS_SET (ch->comm, COMM_AFK))
    {
        send_to_char ("{p<AFK>{x ", ch);
        return;
    }

    while (*str != '\0')
    {
        if (*str != '%')
        {
            *point++ = *str++;
            continue;
        }
        ++str;
        switch (*str)
        {
            default:
                i = " ";
                break;
            case 'e':
                found = FALSE;
                doors[0] = '\0';
                for (door = 0; door < 10; door++)
                {
                    if ((pexit = ch->in_room->exit[door]) != NULL
                        && pexit->u1.to_room != NULL
                        && (can_see_room (ch, pexit->u1.to_room)
                            || (IS_AFFECTED (ch, AFF_INFRARED)
                                && !IS_AFFECTED (ch, AFF_BLIND)))
                        && !IS_SET (pexit->exit_info, EX_CLOSED))
                    {
                        found = TRUE;
                        strcat (doors, dir_name[door]);
                    }
                }
                if (!found)
                    strcat (buf, "none");
                sprintf (buf2, "%s", doors);
                i = buf2;
                break;
            case 'c':
                sprintf (buf2, "%s", "\n\r");
                i = buf2;
                break;
            case 'h':
                sprintf (buf2, "%d", ch->hit);
                i = buf2;
                break;
            case 'H':
                sprintf (buf2, "%d", ch->max_hit);
                i = buf2;
                break;
            case 'm':
                sprintf (buf2, "%d", ch->mana);
                i = buf2;
                break;
            case 'M':
                sprintf (buf2, "%d", ch->max_mana);
                i = buf2;
                break;
            case 'v':
                sprintf (buf2, "%d", ch->move);
                i = buf2;
                break;
            case 'V':
                sprintf (buf2, "%d", ch->max_move);
                i = buf2;
                break;
            case 'x':
                sprintf (buf2, "%d", ch->exp);
                i = buf2;
                break;
            case 'X':
                sprintf (buf2, "%d", IS_NPC (ch) ? 0 :
                         (ch->level + 1) * exp_per_level (ch,
                                                          ch->pcdata->
                                                          points) - ch->exp);
                i = buf2;
                break;
            case 'g':
                sprintf (buf2, "%ld", ch->gold);
                i = buf2;
                break;
            case 's':
                sprintf (buf2, "%ld", ch->silver);
                i = buf2;
                break;
            case 'a':
                if (ch->level > 9)
                    sprintf (buf2, "%d", ch->alignment);
                else
                    sprintf (buf2, "%s",
                             IS_GOOD (ch) ? "good" : IS_EVIL (ch) ? "evil" :
                             "neutral");
                i = buf2;
                break;
            case 'r':
                if (ch->in_room != NULL)
                    sprintf (buf2, "%s",
                             ((!IS_NPC
                               (ch) && IS_SET (ch->act, PLR_HOLYLIGHT))
                              || (!IS_AFFECTED (ch, AFF_BLIND)
                                  && !room_is_dark (ch->
                                                    in_room))) ? ch->in_room->
                             name : "darkness");
                else
                    sprintf (buf2, " ");
                i = buf2;
                break;
            case 'R':
                if (IS_IMMORTAL (ch) && ch->in_room != NULL)
                    sprintf (buf2, "%d", ch->in_room->vnum);
                else
                    sprintf (buf2, " ");
                i = buf2;
                break;
            case 'z':
                if (IS_IMMORTAL (ch) && ch->in_room != NULL)
                    sprintf (buf2, "%s", ch->in_room->area->name);
                else
                    sprintf (buf2, " ");
                i = buf2;
                break;
            case '%':
                sprintf (buf2, "%%");
                i = buf2;
                break;
            case 'o':
                sprintf (buf2, "%s", olc_ed_name (ch));
                i = buf2;
                break;
            case 'O':
                sprintf (buf2, "%s", olc_ed_vnum (ch));
                i = buf2;
                break;
        }
        ++str;
        while ((*point = *i) != '\0')
            ++point, ++i;
    }
    *point = '\0';
    pbuff = buffer;
    colourconv (pbuff, buf, ch);
    send_to_char ("{p", ch);
    write_to_buffer (ch->desc, buffer, 0);
    send_to_char ("{x", ch);

    if (ch->prefix[0] != '\0')
        write_to_buffer (ch->desc, ch->prefix, 0);
    return;
}



/*
 * Append onto an output buffer.
 */
void write_to_buffer (DESCRIPTOR_DATA * d, const char *txt, int length)
{
    /*
     * Find length in case caller didn't.
     */
    if (length <= 0)
        length = strlen (txt);

    /*
     * Initial \n\r if needed.
     */
    if (d->outtop == 0 && !d->fcommand)
    {
        d->outbuf[0] = '\n';
        d->outbuf[1] = '\r';
        d->outtop = 2;
    }

    /*
     * Expand the buffer as needed.
     */
    while (d->outtop + length >= d->outsize)
    {
        char *outbuf;

        if (d->outsize >= 32000)
        {
            bug ("Buffer overflow. Closing.\n\r", 0);
            close_socket (d);
            return;
        }
        outbuf = alloc_mem (2 * d->outsize);
        strncpy (outbuf, d->outbuf, d->outtop);
        free_mem (d->outbuf, d->outsize);
        d->outbuf = outbuf;
        d->outsize *= 2;
    }

    /*
     * Copy.
     */
    strncpy (d->outbuf + d->outtop, txt, length);
    d->outtop += length;
    return;
}



/*
 * Lowest level output function.
 * Write a block of text to the file descriptor.
 * If this gives errors on very long blocks (like 'ofind all'),
 *   try lowering the max block size.
 */
bool write_to_descriptor (int desc, char *txt, int length)
{
    int iStart;
    int nWrite;
    int nBlock;

#if defined(macintosh) || defined(MSDOS)
    if (desc == 0)
        desc = 1;
#endif

    if (length <= 0)
        length = strlen (txt);

    for (iStart = 0; iStart < length; iStart += nWrite)
    {
        nBlock = UMIN (length - iStart, 4096);
            if ((nWrite = write (desc, txt + iStart, nBlock)) < 0)
        {
            perror ("Write_to_descriptor");
            return FALSE;
        }
    }

    return TRUE;
}



void