membership.c 28.5 KB
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/*
 * $Id: membership.c,v 0.5 1991/09/15 10:31:15 linus Exp $
 * Copyright (C) 1991  Lysator Academic Computer Association.
 *
 * This file is part of the LysKOM server.
 * 
 * LysKOM is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 1, or (at your option) 
 * any later version.
 * 
 * LysKOM is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with LysKOM; see the file COPYING.  If not, write to
 * Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
 * or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
 * MA 02139, USA.
 *
 * Please mail bug reports to bug-lyskom@lysator.liu.se. 
 */
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/*
 * membership.c
 *
 * All atomic calls that controlls who is a member in what.
 * (The person/conf relation).
 */
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static char *rcsid = "$Id: membership.c,v 0.5 1991/09/15 10:31:15 linus Exp $";
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#include <time.h>
#include <stdlib.h>
#include "lyskomd.h"
#include <kom-types.h>
#include <services.h>
#include "manipulate.h"
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#include <server/smalloc.h>
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#include "cache.h"
#include "log.h"
#include "minmax.h"
#include "com.h"
#include "isc.h"
#include "connections.h"
#include "send-async.h"
#include <kom-errno.h>
#include "internal-connections.h"

#define DEBUG_MARK_AS_READ

#ifdef DEBUG_MARK_AS_READ
#  include <stdio.h>
#  include <string.h>
#  include "ram-output.h"
#endif





/*
 * Copy all information that ACTPERS is authorized to know about ORIG_P's
 * membership in all conferences to CENSOR_P.
 *
 * This function is used in get_membership().
 */
static void
copy_public_confs (Person   * censor_p,	/* The censored Person-struct */
		   Person   * orig_p,	/* The uncensored Person-struct */
		   Bool	      want_read) /* Does ACTPERS want to know
					  * which texts are read?*/
{
    int i;			/* Number of mships lefte in ORIG_P */
    Membership * censor_m;		/* Pointer in CENSOR_P */
    Membership * orig_m;	/* Pointer in ORIG_P */
    

    /* Copy all information except the secret. */
		    
    censor_p->conferences.confs
	= tmp_alloc( orig_p->conferences.no_of_confs * sizeof(Membership));
    censor_p->conferences.no_of_confs = 0;

    censor_m = censor_p->conferences.confs;
    orig_m   = orig_p->conferences.confs;

    for ( i = 0; i < orig_p->conferences.no_of_confs; i++, orig_m++ )
    {
	if ( fast_access_perm( orig_m->conf_no ) > none )
	{
	    *censor_m = *orig_m;

	    if ( orig_p->flags.unread_is_secret || !want_read )
	    {
		censor_m->no_of_read = 0;
		censor_m->read_texts = NULL;
	    }

	    if ( orig_p->flags.unread_is_secret )
	    {
		censor_m->last_time_read = NO_TIME;
		censor_m->last_text_read = 0;
	    }
	    
	    ++censor_m;
	    ++censor_p->conferences.no_of_confs;
	}
    }
}

/*
 * Change the priority of a certain conference in a person.
 */
static void
do_change_priority (Membership * mship,
		    u_char	 priority,
		    u_short	 where,
		    Pers_no	 pers_no,
		    Person     * pers_p)
{
    Membership tmp_conf;
    
    mship->priority = priority;
    
    /* Check range of where */
    
    if ( where >= pers_p->conferences.no_of_confs )
    {
	where = pers_p->conferences.no_of_confs - 1;
    }
    
    /* And now move the conference to slot number 'where' */
    
    if ( mship < pers_p->conferences.confs + where )
    {
	tmp_conf = *mship;
	while ( mship < pers_p->conferences.confs + where)
	{
	    *mship = *(mship + 1);
	    mship++;
	}
	*mship = tmp_conf;
    }
    else
    {
	tmp_conf = *mship;
	while ( mship > pers_p->conferences.confs + where)
	{
	    *mship = *(mship - 1);
	    mship--;
	}
	*mship = tmp_conf;
    }

    mark_person_as_changed( pers_no );
}


/*
 * Insert a rec_time misc item to a text_status.
 * The item is put at position POS on the list. (0 == first)
 * Take no action if the misc_item at POS is a rec_time.
 * This function is only used when a person marks his letters as read.
 *
 *	Text_stat * text_stat_pointer	Textstatus to modify
 *	int	    pos			Where to insert rec_time
 */

static void
do_add_rec_time (Text_stat    * text_stat_ptr,
		 int		pos)
{
    int i;

    /* Defensive checks */
    if ( pos < 0 || pos > text_stat_ptr->no_of_misc )
    {
	restart_kom("do_add_rec_time() - illegal pos\n");
    }

    /* Check that no rec_time exists */

    if ( pos < text_stat_ptr->no_of_misc
	&& text_stat_ptr->misc_items[ pos ].type == rec_time )
    {
	return;
    }
    
    /* Allocate space */
    text_stat_ptr->misc_items
    = srealloc(text_stat_ptr->misc_items,
	       (++(text_stat_ptr->no_of_misc)) * sizeof(Misc_info));

    /* Move items. */

    for ( i = text_stat_ptr->no_of_misc - 1; i > pos; i-- )
    {
	text_stat_ptr->misc_items[ i ] = text_stat_ptr->misc_items[ i - 1 ];
    }

    /* Set type */
    text_stat_ptr->misc_items[ pos ].type = rec_time;

    /* Set value */
    time( & text_stat_ptr->misc_items[ pos ].datum.received_at);
}

/*
 * add_rec_time adds a 'rec_time'  misc_item to text number LOC_NO in
 * conference CONF_NO. The item will follow a recpt or cc_recpt to ACTPERS.
 * No action is taken if ACTPERS is not a recipient of the text, or the text
 * no longer exists, or the text has already been received.
 */
static void
add_rec_time(Conf_no	  conf_no,
	     Conference * conf_c,  /* The structure for conf_no */
	     Local_text_no local_no)
{
    Bool 	  found;
    Text_no	  text_no;
    Text_stat 	* t_stat;
    int		  i;
    
    if ( local_no >= conf_c->texts.first_local_no + conf_c->texts.no_of_texts
	|| local_no < conf_c->texts.first_local_no )
    {
	return;			/* No longer exists in conf. */
    }

    text_no = conf_c->texts.texts[ local_no - conf_c->texts.first_local_no ];

    if ( text_no == 0 )
    {
	return;			/* Text is deleted. */
    }
    
    GET_T_STAT(t_stat, text_no, (void)0);

    /* locate the misc_item which says that ACTPERS is a recipient */

    for ( found = FALSE, i = 0; !found && i < t_stat->no_of_misc; i++ )
    {
	switch ( t_stat->misc_items[ i ].type )
	{
	case recpt:
	    if ( t_stat->misc_items[ i ].datum.recipient == ACTPERS )
	    {
		do_add_rec_time( t_stat, i + 2 ); /* Add after loc_no */
		found = TRUE;
	    }
	    break;

	case cc_recpt:
	    if ( t_stat->misc_items[ i ].datum.cc_recipient == ACTPERS )
	    {
		do_add_rec_time( t_stat, i + 2 );
		found = TRUE;
	    }
	    break;

	case comm_to:
	case comm_in:
	case footn_to:
	case footn_in:
	case loc_no:
	case rec_time:
	case sent_by:
	case sent_at:
	    break;
	}
    }

    if( found ==  FALSE )
    {
	log("ERROR: add_rec_time(): found==FALSE\n");
    }
    
    mark_text_as_changed( text_no);
    return;
}

/*
 * Check if there are some texts immediately following last_text_read
 * that are read or deleted. If so, update last_text_read and delete them
 * from read_texts.
 *
 * This is only used from mark_as_read().
 */
static void
adjust_read( Membership * m,
	     const Conference * conf)
{
    u_short	i;
    Local_text_no * locp;
    Local_text_no   conf_max;	/* Highest used local_text_no in conf */
    Local_text_no   conf_min;	/* Lowest used local_text_no in conf */
    Bool ready;
#ifdef DEFENSIVE_CHECKS
    Local_text_no prev;
#endif

    i = 0;	/* Number of texts in read_texts in Membership which are
		   included in last_text_read. */

    /* (conf_min <= x <= conf_max) if x is an existing local_text_no */
    conf_max = conf->texts.first_local_no + conf->texts.no_of_texts - 1;
    conf_min = conf->texts.first_local_no;

    do
    {
	ready = TRUE;

	/*  Increase m->last_text_read if
	 *   * the user has read the text (last_text_read+1)
	 *   * text (last_text_read+1) is deleted.
	 */

	if ( m->last_text_read < conf_max) /* Does (last_text_read+1) exist? */
	{
	    if ( m->no_of_read > i	       /* Read? */
		&& m->read_texts[ i ] == m->last_text_read + 1 )
	    {
		i++;
		m->last_text_read++;
		ready = FALSE;
	    }
	    else
	    {
		/* Is the text deleted? */
		if ( m->last_text_read + 1 < conf_min /* Deleted and older
							 than any text that
							 exists in the
							 conference. */
		    || (conf->texts.texts	      /* Deleted? */
				[ m->last_text_read + 1 - conf_min ]
			== 0 ) )
		{
		    m->last_text_read++;
		    ready = FALSE;
		}
	    }
	}
    } while ( ready == FALSE );

    /* Delete the first i entries in read_texts */
    if ( i > 0 )
    {
	m->no_of_read -= i;
    
	for (locp = m->read_texts;
	     locp  < m->read_texts + m->no_of_read;
	     locp++)
	{
	    *locp = *(locp + i);
	}
    }

#ifdef DEFENSIVE_CHECKS
    
    /* Check that the items in read_texts really ARE sorted in ascending order.
       If not, there is probably a bug in this routine or in mark_as_read */
    
    prev = m->last_text_read;
    
    for ( i = 0; i < m->no_of_read; i++)
    {
	if ( prev >= m->read_texts[ i ] )
	{
	    log("Bug in adjust_read. Conference %lu, Priority %lu\n"
		"\tprev = %lu, i = %lu, m->read_texts[i] = %lu\n",
		(u_long)m->conf_no, (u_long)m->priority,
		(u_long)prev, (u_long)i, (u_long)m->read_texts[i]);
	}

	prev = m->read_texts[ i ];
    }
#endif
}

/*
 * insert TEXT in the list of read_texts in M. The texts are sorted.
 * m->no_of_read is updated. m->read_texts is never reallocated, and must
 * thus be big enough to hold the new number.
 *
 * Returns FAILURE if the text is already read.
 *
 * This is only used from mark_as_read().
 */

static Success
insert_loc_no(Local_text_no   text,
	      Membership    * m)
{
    Local_text_no * seek, * move;
    
    
    if ( text <= m->last_text_read )
    {
	return FAILURE;			/* This text was already read. */
    }

    for ( seek = m->read_texts; seek < m->read_texts + m->no_of_read;  seek++)
    {
	if ( text == *seek )
	{
	    return FAILURE;		/* This text was already read. */
	}

	if ( text < *seek )
	{			/* The text should be entered here. */
	    for ( move = m->read_texts + m->no_of_read; move > seek; move--)
	    {
		*move = *(move - 1);
	    }

	    *seek = text;
	    ++(m->no_of_read);

	    return OK;
	}
    }

    *seek = text;		/* The text had a higher number than any */
    ++(m->no_of_read);		/* previously read text.		 */
    
    return OK;
}

/*
 * End of static functions
 */

/*
 * Functions that are exported to the server.
 */

/*
 * Add a member to a conference. All errorchecking should already
 * be done when this function is called. The person must not already
 * be a member of the conference. It is _not_ an error to make WHERE bigger
 * than the number of conferences the person is a member in.
 */

void
do_add_member(Conf_no	   conf_no,  /* Conference to add a new member to. */
	      Conference * conf_c,   /* Conf. status. Must NOT be NULL.  */
	      Pers_no	   pers_no,  /* Person to be added. */
	      Person	 * pers_p,   /* Pers. status. Must NOT be NULL. */
	      u_char	   priority, /* Prioritylevel to assign to this conf */
	      u_short	   where)    /* Sequence number in the list */
{
    Membership  * mship;
    Member	* member;

    /* First add the conference in the person-struct.
     * Make room for it.
     */
    
    pers_p->conferences.confs = srealloc( pers_p->conferences.confs,
					 ++(pers_p->conferences.no_of_confs)
					 * sizeof(Membership));
    
    /* Fill in the room */

    /* Find last slot */    
    mship = pers_p->conferences.confs + pers_p->conferences.no_of_confs - 1 ;
    
    /* Move all data beyond WHERE */
    while ( mship > pers_p->conferences.confs + where )
    {
	*mship = *(mship - 1);
	mship--;
    }

    *mship = EMPTY_MEMBERSHIP;
    
    mship->conf_no = conf_no;
    mship->priority = priority;
    mship->last_time_read = time(NULL);
    mship->last_text_read = 0;
    mship->no_of_read = 0;
    mship->read_texts = NULL;
    
    /* Make room for the person in the conference */
    
    conf_c->members.members = srealloc( conf_c->members.members,
				       ++(conf_c->members.no_of_members)
				       * sizeof(Member));

    /* New members go to the end of the list */
    
    member = (conf_c->members.members
	      + conf_c->members.no_of_members - 1);
    member->member = pers_no;
    
    mark_conference_as_changed( conf_no );
    mark_person_as_changed( pers_no );
    
    return;
}

/*
 * Send an asynchronous message to person pers_no (if he is logged on)
 * and tell him that he is no longer a member of conf_no. Also calls
 * leave_conf(). 
 */
extern void
forced_leave_conf(Pers_no pers_no,
		  Conf_no conf_no)
{
    Connection *real_active_connection;
    Session_no i = 0;
    
    real_active_connection = active_connection;

    while ( (i = traverse_connections(i)) != 0 )
    {
	active_connection = get_conn_by_number(i);

	if ( active_connection->pers_no == pers_no )
	{
	    async_forced_leave_conf(active_connection, conf_no);

	    if ( active_connection->cwc == conf_no )
		leave_conf();
	}
    }

    active_connection = real_active_connection;
}

/*
 * Delete a member from a conference.
 * No checks are made on the parameters.
 * The dynamically allocated areas conf_c->members.members and
 * pers_p->confs are NOT reallocated since they will anyhow sooner or later
 * be flushed from core.
 */

Success
do_sub_member(Conf_no	   conf_no, /* Conf to delete member from. */
	      Conference * conf_c,  /* May be NULL */
	      Member     * member,  /* May be NULL */
	      Pers_no	   pers_no, /* Person to be deleted. */
	      Person	 * pers_p,  /* May be NULL */
	      Membership * mship)   /* Pointer to the persons membership in
				       conf., or NULL if not known. */
{
    if ( conf_c == NULL )
	GET_C_STAT(conf_c, conf_no, FAILURE);
    
    if ( pers_p == NULL )
	GET_P_STAT(pers_p, pers_no, FAILURE);
    
    if ( mship == NULL && (mship = locate_membership(conf_no, pers_p)) == NULL)
	restart_kom("do_sub_member() - can't find mship\n");

    if ( member == NULL && (member = locate_member(pers_no, conf_c)) == NULL)
	restart_kom("do_sub_member() - can't find member.\n");

    forced_leave_conf(pers_no, conf_no);
    
    /* Delete from Person */

    sfree( mship->read_texts );
    --pers_p->conferences.no_of_confs;
    while ( mship
	   < pers_p->conferences.confs + pers_p->conferences.no_of_confs )
    {
	*mship = *(mship + 1);
	++mship;
    }

    /* Delete from Conference */

    --conf_c->members.no_of_members;
    while ( member < conf_c->members.members + conf_c->members.no_of_members )
    {
	*member = *(member + 1);
	++member;
    }

    mark_person_as_changed( pers_no );
    mark_conference_as_changed( conf_no );
    
    return OK;    
}


/*
 * VICTIM is a person or a conference.
 * Meaning of return values:
 *	unlimited: ACTPERS is supervisor of VICTIM, or ACTPERS is admin,
 *		   or ACTPERS is VICTIM
 *	none:	   VICTIM is secret, and ACTPERS is not a member
 *	member:	   ACTPERS is a member in VICTIM, but doesn't have unlimited
 *		   access.
 *	read_protected: The conference is rd_prot and ACTPERS is not a member.
 *	limited:   otherwise.
 *	error:	   see kom_errno
 */

Access
access_perm(Conf_no 	  victim,
	    Conference	* victim_c)	/* May be NULL */
{
    if (victim == ACTPERS)
    	return unlimited;

    if (victim_c == NULL)
	GET_C_STAT(victim_c, victim, error);
    
    if ( ACTPERS != 0 && ENA(admin, 2) )
    	return unlimited;

    if ( is_supervisor(victim, victim_c))
    	return unlimited;

    if ( ACTPERS != 0 && locate_membership( victim, ACT_P ) != NULL )
    	return member;

    if ( victim_c->type.secret )
        return none;

    if ( victim_c->type.rd_prot )
	return read_protected;
    
    return limited;
}


/*
 * Fast version of access_perm. See comment in file server/manipulate.h
 * where Access is defined.
 */
Access
fast_access_perm(Conf_no victim)
{
    Conf_type conf_type;
642
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    if ( !cached_conf_exists(victim) )
	return error;

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    if ( ACTPERS != 0 && (ENA(admin, 2) || ENA(wheel,8) || ACTPERS == victim) )
    	return unlimited;

    if ( ACTPERS != 0 && locate_membership( victim, ACT_P ) != NULL )
    	return member;

    if ( (conf_type=cached_get_conf_type( victim )).secret )
	return access_perm(victim, NULL); /* Only read in conference struct
					   * when really necessary. */

    if ( conf_type.rd_prot )
	return read_protected;
    
    return limited;
}

/*
 * Locate the Member struct in CONF_C for person PERS_NO
 */

Member *
locate_member(Pers_no      pers_no,
	      Conference * conf_c)
{
    Member * member;
    int      i;

    for(member = conf_c->members.members, i = conf_c->members.no_of_members;
	i > 0; i--, member++)
    {
	if ( member->member == pers_no )
	{
	    return member;
	}
    }

    return NULL;
}


/*
 * Find the data about PERS_P:s membership in CONF_NO.
 * Return NULL if not found
 */

Membership *
locate_membership(Conf_no     conf_no,
		  Person    * pers_p)
{
    Membership * confp;
    int    i;

    for(confp = pers_p->conferences.confs, i = pers_p->conferences.no_of_confs;
	i > 0; i--, confp++)
    {
	if ( confp->conf_no == conf_no )
	{
	    return confp;
	}
    }

    return NULL;
}

/*
 * Atomic functions.
 */

/*
 * Unsubscribe from a conference.
 *
 * You must be supervisor of either conf_no or pers_no to be allowed to
 * do this.
 *
 * BUGS: There is no passive membership.
 */
extern Success
sub_member(	Conf_no		conf_no,
		Pers_no		pers_no )
{
    Conference  * conf_c;
    Membership	* mship;
    Person	* pers_p;
    
    CHK_LOGIN(FAILURE);
    GET_C_STAT(conf_c, conf_no, FAILURE);
    GET_P_STAT(pers_p, pers_no, FAILURE);

    if( (mship = locate_membership(conf_no, pers_p) ) == NULL)
    {
	kom_errno = conf_c->type.secret ? KOM_UNDEF_CONF : KOM_NOT_MEMBER;
	return FAILURE;
    }

    if ( !is_supervisor(conf_no, conf_c) && !is_supervisor(pers_no, NULL)
	&& !ENA(admin, 4) )
    {
	kom_errno = conf_c->type.secret ? KOM_UNDEF_CONF : KOM_PERM;
	return FAILURE;
    }

    return do_sub_member(conf_no, conf_c, NULL, pers_no, pers_p, mship);    
}


/*
 * Add a member to a conference (join a conference) or
 * Change the priority of a conference.
 *
 * Anyone may add anyone as a member as long as the new member is not
 * secret and the conference is not rd_prot. This might be a bug.
 *
 * PRIORITY is the assigned priority for the conference. WHERE says
 * where on the list the person wants the conference. 0 is first. WHERE
 * is automatically set to the number of conferences that PERS_NO is member
 * in if WHERE is too big, so it is not an error to give WHERE == ~0 as
 * a parameter.
 *
 * You can only re-prioritize if you are supervisor of pers_no.
 */
extern Success
add_member(Conf_no	conf_no,
	   Pers_no	pers_no,
	   u_char	priority,
	   u_short	where)		/* Range of where is [0..] */
{
    Conference  * conf_c, * pers_c;
    Person	* pers_p;
    Membership	* mship;
    

    CHK_LOGIN(FAILURE);
    GET_C_STAT(conf_c, conf_no, FAILURE);
    GET_P_STAT(pers_p, pers_no, FAILURE);

    if ( access_perm(conf_no, conf_c) < limited && !ENA(admin, 4) )
    {
	kom_errno = conf_c->type.secret ? KOM_UNDEF_CONF : KOM_ACCESS;
	return FAILURE;
    }

    /* Is he already a member? */

    if ( (mship = locate_membership( conf_no, pers_p )) != NULL)
    {
	/* He is already a member. Only change the priority. */

	GET_C_STAT(pers_c, pers_no, FAILURE);
	if( !is_supervisor( pers_no, pers_c ) )	/* Noone else can change */
						/* one's priorities. */
	{					 
	    kom_errno = KOM_PERM;
	    return FAILURE;
	}

	do_change_priority( mship, priority, where, pers_no, pers_p);
    }
    else
    {
	do_add_member(conf_no, conf_c, pers_no, pers_p, priority, where);
    }

    return OK;
}

#ifdef DEBUG_MARK_AS_READ
static int
check_membership(Pers_no pno,
		 const Conference *conf,
		 const Membership *mship)
{
    int error=0;
    int i;
    Local_text_no last=0;
    int log_no=0;
    
    /* Check read texts */
    if ( mship->last_text_read >
	conf->texts.first_local_no + conf->texts.no_of_texts - 1)
    {
	if ( log_no++ < 80 )
	    log("membership.c: check_membership():"
		"(%d) Person %lu has read text %lu in conf %lu,"
		"which only has %lu texts.\n",
		log_no,
		(u_long)pno,
		(u_long)mship->last_text_read,
		(u_long)mship->conf_no,
		(u_long)(conf->texts.first_local_no
			 + conf->texts.no_of_texts - 1));
	error++;
    }

    last = mship->last_text_read;

    for ( i = 0; i < mship->no_of_read; i++)
    {
	if ( mship->read_texts[i] <= last )
	{
	    error++;
	}

	last = mship->read_texts[i];
    }

    return error;
}
#endif

/*
 * mark_as_read() is used to tell LysKOM which texts you have read.
 * You can mark several texts in one chunk, but the chunk should not
 * be too big to prevent users from having to re-read texts in case of
 * a [server/client/network]-crash.
 *
 * The texts are marked per conference. If there are several recipients
 * to a text it should be mark_as_read() in all the recipients.
 *
 * If conference is ACTPERS mailbox it will add a rec_time item in the
 * misc_items field.
 *
 * It is only possible to mark texts as read in a conference you are
 * member in.
 *
 * Attempts to mark non-existing texts as read are ignored if the text
 * has existed. If the text has not yet been created KOM_NO_SUCH_LOCAL_TEXT
 * will be returned in kom_errno.
 *
 * If CONFERENCE is the current working conference of ACTPERS, and the text
 * has not previously been marked as read, ACT_P->read_texts will be
 * increased. If the client cooperates this will be correct. If the
 * client pepsi()s to all recipients of a text before marking it as read
 * the read_texts field will be too big. (If anyone cares about that,
 * feel free to rewrite this code as long as it doen't get too CPU-
 * intensive.)
 */
extern Success
mark_as_read (Conf_no		      conference,
	      int		      no_of_texts,
	      const Local_text_no  * text_arr )
{
    int		 i;
    Membership * m;
    int		 allocflg = 0;	/* read_texts is not re-allocated yet */
    Conference * conf_c;
    Success	 retval = OK;
#ifdef DEBUG_MARK_AS_READ
    const Local_text_no  * const text_arr_start = text_arr;
    Membership   original;
    int		 loop;
    static int   log_no = 0;
#endif

    
    CHK_LOGIN(FAILURE);
    GET_C_STAT(conf_c, conference, FAILURE);

    if ( (m = locate_membership( conference, ACT_P)) == NULL)
    {
	kom_errno = KOM_NOT_MEMBER;
	return FAILURE;
    }

#ifdef DEBUG_MARK_AS_READ
    if ( m->read_texts == NULL && m->no_of_read != 0 )
    {
	log("mark_as_read(): m->read_texts == NULL && m->no_of_read == %lu (corrected).",
	    (u_long)m->no_of_read);
	m->no_of_read = 0;
    }
    
    original = *m;
    original.read_texts = smalloc(m->no_of_read * sizeof(Local_text_no));
    memcpy(original.read_texts, m->read_texts,
	   m->no_of_read * sizeof(Local_text_no));
#endif
    
    for( i = no_of_texts; i > 0; i--, text_arr++ )
    {
	if ( *text_arr >= ( conf_c->texts.first_local_no
			   + conf_c->texts.no_of_texts ))
	{
	    kom_errno = KOM_NO_SUCH_LOCAL_TEXT;
	    err_stat = no_of_texts - i;
	    retval = FAILURE;
	    break;		/* Exit for-loop */
	}

	if ( *text_arr == 0 )
	{
	    kom_errno = KOM_LOCAL_TEXT_ZERO;
	    err_stat = no_of_texts - i;
	    retval = FAILURE;
	    break;		/* Exit for-loop */
	}
	
	/* Is it a letter to ACTPERS? If so, add a rec_time item. */

	if ( conference == ACTPERS )
	    add_rec_time( conference, conf_c, *text_arr );
	
	/* Update the Membership struct */

	if ( *text_arr == m->last_text_read + 1 )
	{
	    ++m->last_text_read;
	    if ( active_connection->cwc == conference )
		++ACT_P->read_texts;
	}
	else
	{
	    if ( allocflg == 0 )
	    {
		/* Realloc as much as is needed, and probably more. */
		/* Better than to execute srealloc 100 times... */
		
		m->read_texts = srealloc( m->read_texts,
					 (m->no_of_read + i)
					 * sizeof(Local_text_no));
		allocflg = 1;
	    }

	    if ( insert_loc_no( *text_arr, m ) == OK
		&& active_connection->cwc == conference )
	    {
		++ACT_P->read_texts;
	    }
	}
    }

    adjust_read( m, conf_c ); /* Delete initial part
				 of read_texts in the membership. */
    /* Realloc to correct size */
    
    m->read_texts = srealloc( m->read_texts,
			     (m->no_of_read) * sizeof(Local_text_no));
    
    mark_conference_as_changed ( conference );

    if ( active_connection->cwc == conference )
	mark_person_as_changed( ACTPERS );
#ifdef DEBUG_MARK_AS_READ
    /* Check that the membership is correct. Otherwise log all info. */
    if ( check_membership(ACTPERS, conf_c, m) > 0 && log_no++ < 40 )
    {
	log("mark_as_read(): (Msg no %d) Person %lu "
	    "has a corrupt membership:\n",
	    log_no, (u_long)ACTPERS);
	log("Dump of data follows: <original membership>"
	    " <updated membership> <texts to mark>\n");
	foutput_membership(stderr, &original);
	putc('\n', stderr);
	foutput_membership(stderr, m);
	fprintf(stderr, "\n%lu { ", (u_long)no_of_texts);
	for ( loop = 0; loop < no_of_texts; loop++ )
	{
	    fprintf(stderr, "\n%lu ", (u_long)text_arr_start[loop]);
	}
	fprintf(stderr, "}\n");
    }

    sfree(original.read_texts);
#endif
    return retval;
}

/*
 * Ask what conferences a person is a member of.
 *
 * /// The following might be slightly misleading: /// /ceder
 * Only ask for information about at most NO_OF_CONFS conferences
 * starting with conferece FIRST. WANT_READ_TEXTS has the same
 * function as GETP_READ_TEXTS in the get_person_stat call.
 * ///
 */
extern  Success
get_membership (Pers_no		  pers_no,
		u_short		  first,
		u_short		  no_of_confs,
		Bool		  want_read_texts,
		Membership_list	* memberships )
{
    Person		* p_orig;
    Person		  temp_pers;
    Conference		* pers_c;
    Access		  acc;
    int			  i;
            
    CHK_LOGIN (FAILURE);
    
    GET_P_STAT (p_orig, pers_no, FAILURE);
    GET_C_STAT (pers_c, pers_no, FAILURE);
    
    acc = access_perm (pers_no, pers_c);
  
    if (acc == error)
	return  FAILURE;

    if (acc == none)
    {
	kom_errno = KOM_UNDEF_PERS;
	return  FAILURE;
    }

    /* Make a copy of the struct. */
    
    temp_pers = *p_orig;
    
    /* Delete all secret information. */

    if ( acc != unlimited )
	copy_public_confs (&temp_pers, p_orig, want_read_texts);
    else if ( !want_read_texts )
    {
	/* Delete info about read texts. */
	temp_pers.conferences.confs
	    = tmp_alloc(temp_pers.conferences.no_of_confs
			* sizeof(Membership));

	memcpy(temp_pers.conferences.confs,
	       p_orig->conferences.confs,
	       (temp_pers.conferences.no_of_confs
		* sizeof(Membership) ));
	
	for ( i = 0; i < temp_pers.conferences.no_of_confs; i++ )
	    temp_pers.conferences.confs[ i ].read_texts = NULL;
    }
    

    *memberships = temp_pers.conferences;

    if ( first >= memberships->no_of_confs )
    {
	kom_errno = KOM_INDEX_OUT_OF_RANGE;
	return FAILURE;
    }
    
    memberships->confs += first;
    memberships->no_of_confs = min( memberships->no_of_confs - first,
				   no_of_confs);

    return OK;
}

/*
 * +++///
 *
 * first starts at 0.
 */
extern  Success
get_members (Conf_no	  conf_no,
	     u_short	  first,
	     u_short	  no_of_members,
	     Member_list * members	)
{
    Conference * conf_c;
    Access	 acc;
        
    GET_C_STAT(conf_c, conf_no, FAILURE);

    acc = access_perm( conf_no, conf_c);

    if ( acc == error )
	return FAILURE;

    if ( acc == none )
    {
	kom_errno = KOM_UNDEF_CONF;
	return FAILURE;
    }

    *members = conf_c->members;

    if ( first >= members->no_of_members )
    {
	kom_errno = KOM_INDEX_OUT_OF_RANGE;
	return FAILURE;
    }

    members->members += first;
    members->no_of_members = min (no_of_members,
				  members->no_of_members - first);
    
    return OK;
}

/*
 * Get a list of all conferences where it is possible that a person has
 * unread articles.
 */

Success
get_unread_confs(Pers_no       pers_no,
		 Conf_no_list *result)
{
    Person *pers_p;
    Membership *confs;
    u_short n;

    GET_P_STAT(pers_p, pers_no, FAILURE);

    result->conf_nos = tmp_alloc (pers_p->conferences.no_of_confs
				  * sizeof(Conf_no));
    result->no_of_confs = 0;
        
    for ( n = 0, confs = pers_p->conferences.confs;
    	 n < pers_p->conferences.no_of_confs;
	 n++, confs++ )
    {
	if ( confs->last_text_read
	    < cached_get_highest_local_no( confs->conf_no ) )
	{
	    result->conf_nos[ result->no_of_confs++ ] = confs->conf_no;
	}
    }
    return OK;
}


/*
 * Tell the server that I want to mark/unmark texts as read so that I
 * get (approximately) no_of_unread unread texts in conf_no.
 */
extern  Success
set_unread (Conf_no   conf_no,
	    Text_no   no_of_unread)
{
    Membership  *mship;
    Conference  *conf_c;
    Local_text_no highest;
    
    CHK_LOGIN(FAILURE);

    GET_C_STAT(conf_c, conf_no, FAILURE);
    
    if ( (mship = locate_membership(conf_no, ACT_P)) == NULL )
    {
	kom_errno = KOM_NOT_MEMBER;
	return FAILURE;
    }

    highest = conf_c->texts.first_local_no + conf_c->texts.no_of_texts - 1;
    
    mship->last_text_read = ((highest > no_of_unread)
			     ? (highest - no_of_unread) : 0);
    
    sfree(mship->read_texts);
    mship->read_texts = NULL;
    mship->no_of_read = 0;

    mark_person_as_changed(ACTPERS);
    return OK;
}