dbck-cache.c 32.6 KB
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/*
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 * $Id: dbck-cache.c,v 0.51 2002/09/06 22:42:37 ceder Exp $
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 * Copyright (C) 1991-1999, 2001-2002  Lysator Academic Computer Association.
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 *
 * 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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/*
 * This module contains some very simple simulations of the routines in
 * cache.c.
 *
 * Extracted from ram-cache.c and rewritten by ceder.
 *
 * New database format with texts in their own file by Inge Wallin.
 *   Also save time as a time_t instead of a struct tm.
 */

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#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

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#include <stdio.h>
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#ifndef SEEK_END
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#  include <fcntl.h>
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#endif
#ifndef SEEK_END
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#  include <unistd.h>
#endif
#ifndef SEEK_END
#  define SEEK_SET 0
#  define SEEK_END 2
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#endif
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#ifdef HAVE_STDLIB_H
#  include <stdlib.h>
#endif
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#include <time.h>
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#include <sys/types.h>
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#ifdef TIME_SYNC
#  include <sys/resource.h>
#endif
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#include "ldifftime.h"
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#include "exp.h"
#include "misc-types.h"
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#include "s-string.h"
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#include "kom-types.h"
#include "kom-errno.h"
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#include "cache.h"
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#include "debug.h"
#include "server/smalloc.h"
#include "log.h"
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#include "lyskomd.h"
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#include "kom-memory.h"
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#include "ram-parse.h"
#include "ram-output.h"
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#include "param.h"
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#include "dbck-cache.h"
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#include "local-to-global.h"
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#include "unused.h"
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/*
 * All functions that can fail sets kom_errno to a suitable value
 * if they fail.
 */
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Person		** pers_arr;
Conference 	** conf_arr;
String		 * name_list; /* "cache" list */
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			        	  /* Global var auto init to NULL */
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static Conf_no     next_free_num = 1;
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Text_stat 	** text_arr;
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static Text_no next_text_num = 1;
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/* Defined in standalone.c */

extern Info kom_info;
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/* Defined in ramkomd.c */

static FILE          *text_file = NULL;
static FILE	     *new_text_file = NULL; /* Used when garbage collecting. */

BUGDECL;


/* Macros */

#define TRACE2(format, arg) if ( buglevel > 2 ) printf(format, arg)
#define TRACE1(format) if ( buglevel > 2 ) printf(format)
#define TRACESTR(str)  if ( buglevel > 2 ) s_puts(str)
#define INRANGE(str, num, retval) if ( num == 0 || num >= next_free_num ) \
{			\
    return retval;	\
    printf("%s: conf_no %d out of range 1 ... %d ", str, num, next_free_num); \
    fflush(stdout);	\
    fflush(stderr);	\
    abort();		\
}

#define TEXT_RANGE(str, num, retval) if ( num == 0 || num >= next_text_num ) \
{	\
    return retval;\
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    printf("Text_no out of range 1 ... %ld ", next_text_num); \
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    printf(str);	\
    fflush(stdout);	\
    fflush(stderr);	\
    abort(); 		\
}

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#define VOID_TEXT_RANGE(str, num) if ( num == 0 || num >= next_text_num ) \
{	\
    return;\
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    printf("Text_no out of range 1 ... %ld ", next_text_num); \
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    printf(str);	\
    fflush(stdout);	\
    fflush(stderr);	\
    abort(); 		\
}

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extern Conf_type
cached_get_conf_type (Conf_no conf_no)
{
    return conf_arr [ conf_no ]->type;
}



/*
 * Various function calls to tell the cache that something is changed.
 */

void
mark_person_as_changed(Pers_no	pers_no)
{
    TRACE2("Person %d is changed\n", pers_no);
    return;    
}


void
mark_conference_as_changed(Conf_no	conf_no)
{
    TRACE2("Conf.  %d is changed\n", conf_no);
    return;
}

void
mark_text_as_changed( Text_no text_no )
{
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    TRACE2("Text %lu is changed.\n", text_no);
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    VOID_TEXT_RANGE("mark_text_as_changed\n", text_no);
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}    


/*
 * Person-related calls
 */


extern Success
cached_create_person( Pers_no person )
{
    TRACE2("Person %d is being created.\n", person);
    INRANGE("cached_create_person\n", person, FAILURE);

    if ( pers_arr[ person ] != NULL )
    {
	TRACE1("pers_arr not NULL");
	fflush(stdout);
	fflush(stderr);
	abort();
    }
    
    pers_arr[ person ] = alloc_person();
    return OK;
}


extern Person *
cached_get_person_stat( Pers_no	person )
{
    INRANGE("cached_get_person_stat\n", person, NULL);
    TRACE2("cached_get_person_stat %d\n", person);
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    err_stat = person;
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    kom_errno = KOM_UNDEF_PERS;
    
    return pers_arr[ person ];
}



/*
 * Conference-related calls
 */
extern Conf_no	/* Also cache the name */
cached_create_conf (String  name)
{
    Conference * conf_c;
    Conf_no	 conf_no;

    TRACE1("cached_create_conf( ");
    TRACESTR(name);
    TRACE1(" )\n");

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    if ( next_free_num >= param.max_conf )
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    {
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        err_stat = next_free_num;
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	kom_errno = KOM_INDEX_OUT_OF_RANGE;
	return 0;
    }
    
    conf_no = next_free_num++;
    conf_c  = alloc_conference();

    conf_c->name = EMPTY_STRING;
    s_strcpy(&conf_c->name, name);

    TRACE2(" number %d\n", conf_no);

    conf_arr[ conf_no ] = conf_c;
    pers_arr[ conf_no ] = NULL;
    
    return conf_no;
}

extern Success
cached_delete_conf( Conf_no	conf )
{
    INRANGE("cached_delete_conf()", conf, FAILURE);
    if ( conf_arr[ conf ] == NULL )
    {
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        err_stat = conf;
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	kom_errno = KOM_UNDEF_CONF;
	return FAILURE;
    }
    free_conference(conf_arr[ conf ]);
    conf_arr[ conf ] = NULL;
    return OK;
}

Success
cached_delete_person(Pers_no pers)
{
    INRANGE("cached_delete_person()", pers, FAILURE);
    if ( pers_arr[ pers ] == NULL )
    {
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        err_stat = pers;
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	kom_errno = KOM_UNDEF_PERS;
	return FAILURE;
    }

    pers_arr[ pers ] = NULL;
    return OK;
}

Success
cached_delete_text(Text_no text)
{
    TEXT_RANGE("cached_delete_text()", text, FAILURE);
    if ( text_arr[ text ] == NULL )
    {
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        err_stat = text;
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	kom_errno = KOM_NO_SUCH_TEXT;
	return FAILURE;
    }
    free_text_stat(text_arr[ text ]);
    text_arr[ text ] = NULL;
    return OK;
    
}


extern Conference *
cached_get_conf_stat(	Conf_no		conf_no )
{
    INRANGE("cached_get_conf_stat\n", conf_no, NULL);
    TRACE2("cached_get_conf_stat %d\n", conf_no);
    kom_errno = KOM_UNDEF_CONF;
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    err_stat = conf_no;
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    return conf_arr[ conf_no ];
}

/*
 * Return TRUE if conf_no exists.
 */
Bool
cached_conf_exists(Conf_no conf_no)
{
    return conf_arr[ conf_no ] != NULL ? TRUE : FALSE;
}

    
/*
 * Calls to handle texts
 */

extern String
cached_get_text( Text_no text )
{
    String  the_string;

    TEXT_RANGE("cached_get_text\n", text, EMPTY_STRING);
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    TRACE2("cached_get_text %lu\n", text);
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    if ( text_arr[ text ] == NULL )
	return EMPTY_STRING;
    else
    {
	the_string.string = tmp_alloc( text_arr[text]->no_of_chars );
	the_string.len = text_arr[text]->no_of_chars;
	fseek(text_file, text_arr[ text ]->file_pos, SEEK_SET);
	if ( fread(the_string.string, sizeof(char), the_string.len, text_file)
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	    != (size_t)the_string.len )
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	{
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	    kom_log("%s read enough characters of text %lu\n",
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		"WARNING: cached_get_text: couldn't",
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		(unsigned long)text);
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	}
		    
	return the_string;
    }
}

extern Text_stat *	/* NULL on error */
cached_get_text_stat(	Text_no		text )
{
    kom_errno = KOM_NO_SUCH_TEXT;
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    err_stat = text;
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    TEXT_RANGE("cached_get_text_stat\n", text, NULL);
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    TRACE2("cached_get_text_stat %lu\n", text);
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    return text_arr[ text ];
}



/*
 * The text is set up with an empty misc-field. The misc field is
 * later initialized by create_text.
 */

#if 0
extern Text_no
cached_create_text( String message)
{
    Text_no tno;

    tno = next_text_num++;

    TRACE2("cached_create_text (len=%d)\n", message.len);

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    if ( tno >= param.max_text )
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    {
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	next_text_num = param.max_text;
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	kom_errno = KOM_INDEX_OUT_OF_RANGE;
        err_stat = next_text_num;
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	return 0;
    }
        
    text_arr[ tno ] = alloc_text_stat();
    text_arr[ tno ]->no_of_misc = 0;
    text_arr[ tno ]->misc_items = NULL;
    text_arr[ tno ]->no_of_marks = 0;
    text_arr[ tno ]->no_of_lines = 0;
    text_arr[ tno ]->no_of_chars = 0;
    fseek(text_file, 0, SEEK_END);
    text_arr[ tno ]->file_pos = ftell(text_file);

    if ( fwrite(message.string, sizeof(char), message.len, text_file)
	!= message.len ) {
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	kom_log("WARNING: cached_create_text: Couldn't write the text %d\n",
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	    tno);
    }

    fflush(text_file);
    
    TRACE2("cached_create_text -> %d\n", tno);
    
    return tno;
}
#endif

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void
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cached_flush_text(Text_no text_no,
		  String message)
{
    if ( text_no >= next_text_num )
    {
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	kom_log("cached_flush_text(%lu, string): only text %lu exists.\n",
		(u_long) text_no, (u_long) next_text_num);
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	return;
    }
        
    fseek(new_text_file, 0, SEEK_END);
    text_arr[ text_no ]->file_pos = ftell(new_text_file);

    if ( fwrite(message.string, sizeof(char), message.len, new_text_file)
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	!= (size_t)message.len )
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    {
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	kom_log("WARNING: cached_flush_text: Couldn't write the text %ld\n",
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	    (unsigned long)text_no);
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    }

    fflush(new_text_file);
}

Text_no
traverse_text(Text_no seed)
{
    seed++;
    
    while ( seed < next_text_num && text_arr[ seed ] == NULL )
	seed++;

    return (seed == next_text_num) ? 0 : seed ;
}

Pers_no
traverse_person(Pers_no seed)
{
    seed++;
    
    while ( seed < next_free_num && pers_arr[ seed ] == NULL )
	seed++;

    return (seed == next_free_num) ? 0 : seed ;
}

Conf_no
traverse_conference(Conf_no seed)
{
    seed++;
    
    while ( seed < next_free_num && conf_arr[ seed ] == NULL )
	seed++;

    return (seed == next_free_num) ? 0 : seed ;
}

extern Garb_nice
cached_get_garb_nice (Conf_no conf_no)
{
    return conf_arr [ conf_no ]->nice;
}

extern Local_text_no
cached_get_highest_local_no (Conf_no conf_no)
{
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    return l2g_first_appendable_key(&conf_arr[conf_no]->texts) - 1;
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}

/* Lock a person struct in memory. Increase a referenc count. */
void
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cached_lock_person(Pers_no UNUSED(pers_no))
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{}

/* Decrease reference count. If zero, unlock person. */
void
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cached_unlock_person(Pers_no UNUSED(pers_no))
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{}

/* Lock a conf struct in memory. Increase a referenc count. */
void
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cached_lock_conf(Conf_no UNUSED(conf_no))
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{}

/* Decrease reference count. If zero, unlock conf. */
void
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cached_unlock_conf(Conf_no UNUSED(conf_no))
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{}


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static long
get_version(const char *fn)
{
    FILE	 *fp;
    char	  c;
    long	  version;
    
    if ( (fp = fopen(fn, "rb")) == NULL)
	return -1;

    fseek(fp, 5, SEEK_SET);
    if ( (c = getc(fp)) == '\n')
    {
	fclose(fp);
	return 0;
    }
    version = fparse_long(fp);
    fclose(fp);

    return version;
}
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static Bool
is_clean(const char *fn)
{
    FILE *fp;

    if ( (fp = fopen(fn, "rb")) == NULL )
	return FALSE;

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    if ( getc(fp) == 'C' && 
         getc(fp) == 'L' &&
         getc(fp) == 'E' &&
         getc(fp) == 'A' &&
         getc(fp) == 'N' )
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    {
	fclose(fp);
	return TRUE;
    }
    else
    {
	fclose(fp);
	return FALSE;
    }
}

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static void
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sync_output_header(FILE* fp, const char *state, int oformat)
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{
    switch (oformat)
    {
    case 0:
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        fprintf(fp, "%s\n", state);
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        break;
    case 1:
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        fprintf(fp, "%s:%05ld\n", state, (long)oformat);
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        break;
    case 2:
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        fprintf(fp, "%s:%05ld\n", state, (long)oformat);
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        fprintf(fp, "%020lu\n", (unsigned long)time(NULL));
        break;
    default:
        restart_kom("sync_output_header(): Unknown output format %d",
                    oformat);
    }
}



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#ifdef TIME_SYNC
static long
timerdiff(struct timeval a,
	   struct timeval b)
{
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    /* Ignore the tv_usec parts.  One second more or less doesn't matter.  */
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    return a.tv_sec - b.tv_sec;
}
#endif

extern void			/* Write out everything. */
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cache_sync_all(void)
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{
    FILE *fp;
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    Conf_no ic;
    Text_no it;
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#ifdef TIME_SYNC
    struct rusage start, after_confs, after_persons, after_text_stats,
    	after_text_masses;
    time_t st, ac, ap, ats, atm;
    void getrusage(int who, struct rusage *rusage);
#endif
    
#ifdef TIME_SYNC
    getrusage(0, &start);
    time(&st);
#endif

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    if ( is_clean(param.datafile_name) )
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    {
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	if (is_clean(param.backupfile_name))
	{
	    if (rename(param.backupfile_name,
		       param.backupfile_name_2) != 0)
	    {
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		kom_log("pre_sync: can't do extra backup.\n");
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	    }
	}

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	if ( rename(param.datafile_name, param.backupfile_name) != 0 )
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	    kom_log("WARNING: cache_sync_all: can't backup.\n");
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    }
    else
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	kom_log("cache_sync_all: datafile not clean. No backup taken.\n");
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    if ( (fp=fopen(param.datafile_name, "w") ) == NULL )
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    {
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	kom_log("WARNING: cache_sync_all: can't open file to save in.\n");
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	return;
    }

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    /*
     * Print file header and other things that go before the conferences.
     */
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    switch (oformat)
    {
    case 0:
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        sync_output_header(fp, "DIRTY", oformat);
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	fprintf(fp, "%d\n", next_free_num);	  /* NEXT_FREE_NUM */
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        break;
    case 1:
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    case 2:
        sync_output_header(fp, "DIRTY", oformat);
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	fprintf(fp, "#C %d\n", next_free_num);
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	fprintf(fp, "#T %ld\n", next_text_num);
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        fprintf(fp, "I");
        foutput_info(fp, &kom_info);
        fprintf(fp, "\n");
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        break;
    default:
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        restart_kom("Unknown output file format: %ld\n", oformat);
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    }
    
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    for (ic = 1; ic < next_free_num; ic++) /* CONFS */
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    {
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        switch (oformat)
        {
        case 0:
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            if (conf_arr[ic] == NULL)
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                fprintf(fp, "@");
            else
            {
                fprintf(fp, "+ ");
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                foutput_conference(fp, conf_arr[ic]);
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            }
            putc('\n', fp);
            break;
        case 1:
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        case 2:
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            if (conf_arr[ic] != NULL)
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            {
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                fprintf(fp, "C %lu", (unsigned long)ic);
                foutput_conference(fp, conf_arr[ic]);
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                putc('\n', fp);
            }
            break;

        default:
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            restart_kom("Bad output file format: %ld\n", oformat);
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        }
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    }
#ifdef TIME_SYNC
    getrusage(0, &after_confs);
    time(&ac);
#endif
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    for (ic = 1; ic < next_free_num; ic++) /* PERSONS */
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    {
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        switch (oformat)
        {
        case 0:
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            if (pers_arr[ic] == NULL)
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                fprintf(fp, "@");
            else
            {
                fprintf(fp, "+ ");
                fprintf(fp, "%dH", PASSWD_LEN);
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                fwrite(pers_arr[ic]->pwd, PASSWD_LEN, 1, fp);
                foutput_person(fp, pers_arr[ic]);
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            }
            putc('\n', fp);
            break;
        case 1:
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        case 2:
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            if (pers_arr[ic] != NULL )
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            {
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                fprintf(fp, "P %lu", (unsigned long)ic);
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                fprintf(fp, " %dH", PASSWD_LEN);
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                fwrite(pers_arr[ic]->pwd, PASSWD_LEN, 1, fp);
                foutput_person(fp, pers_arr[ic]);
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                putc('\n', fp);
            }
            break;

        default:
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            restart_kom("Bad output file format: %ld\n", oformat);
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        }
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    }
#ifdef TIME_SYNC
    getrusage(0, &after_persons);
    time(&ap);
#endif

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    /*
     * Print things that go between persons and texts
     */

    switch (oformat)
    {
    case 0:
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	fprintf(fp, "%ld\n", next_text_num);	/* NEXT_TEXT_NUM */
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        break;
    case 1:
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    case 2:
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        break;
    default:
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        restart_kom("Unknown output file format: %ld\n", oformat);
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    }
    
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    for (it = 1; it < next_text_num; it++) /* TEXT_STATS */
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    {
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        switch (oformat)
        {
        case 0:
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            if (text_arr[it] == NULL)
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                fprintf(fp, "@");
            else
            {
                fprintf(fp, "+ ");
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                foutput_text_stat(fp, text_arr[it]);
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            }
            putc('\n', fp);
            break;
        case 1:
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        case 2:
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            if (text_arr[it] != NULL)
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            {
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                fprintf(fp, "T %lu", it);
                foutput_text_stat(fp, text_arr[it]);
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                putc('\n', fp);
            }
            break;
        default:
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            restart_kom("Unknown output file format: %ld\n", oformat);
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        }
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    }

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    /*
     * Print file footer
     *
     * Ho-hum. I thought there was supposed to be a newline at the end
     * of a version zero file, but it seems I was wrong, so this code
     * basically does...absolutely nothing.
     */

    switch (oformat)
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    {
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    case 0:
        break;
    case 1:
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    case 2:
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        break;
    default:
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        restart_kom("Unknown output file format: %ld\n", oformat);
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    }
    
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#ifdef TIME_SYNC
    getrusage(0, &after_text_stats);
    time(&ats);

    getrusage(0, &after_text_masses);
    time(&atm);
#endif

    rewind(fp);
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    sync_output_header(fp, "CLEAN", oformat);
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    fclose(fp);

#ifdef TIME_SYNC
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    kom_log("Sync ready.\n"
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    	"User: %4ld sec (%4ld conf, %4ld pers, %4ld stat, %4ld text)\n"
    	"Sys:  %4ld sec (%4ld conf, %4ld pers, %4ld stat, %4ld text)\n"
	"Real: %4ld sec (%4ld conf, %4ld pers, %4ld stat, %4ld text)\n"
	"Page faults: %4ld. Swapped: %4ld. Outblocked: %4ld.\n",
	
	timerdiff(after_text_masses.ru_utime, start.ru_utime),
	timerdiff(after_confs.ru_utime, start.ru_utime),
	timerdiff(after_persons.ru_utime, after_confs.ru_utime),
	timerdiff(after_text_stats.ru_utime, after_persons.ru_utime),
	timerdiff(after_text_masses.ru_utime, after_text_stats.ru_utime),
	
	timerdiff(after_text_masses.ru_stime, start.ru_stime),
	timerdiff(after_confs.ru_stime, start.ru_stime),
	timerdiff(after_persons.ru_stime, after_confs.ru_stime),
	timerdiff(after_text_stats.ru_stime, after_persons.ru_stime),
	timerdiff(after_text_masses.ru_stime, after_text_stats.ru_stime),

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	(u_long)ldifftime(atm, st),
	(u_long)ldifftime(ac, st),
	(u_long)ldifftime(ap, ac),
	(u_long)ldifftime(ats, ap),
	(u_long)ldifftime(atm, ats),
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	after_text_masses.ru_majflt - start.ru_majflt,
	after_text_masses.ru_nswap - start.ru_nswap,
	after_text_masses.ru_oublock - start.ru_oublock);
#endif    
}

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void
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cache_open_new_text_file(void)
{
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    if ( ( new_text_file = fopen(param.textfile_name, "w")) == NULL )
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    {
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	kom_log("Can't open file to save new texts. Goodbye.\n");
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	exit(1);
    }
}

extern Success
init_cache(void)
{
    FILE *fp = NULL;
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    unsigned long i;
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    extern int vflag;		/* from dbck.c */
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    extern Bool truncated_texts; /* from dbck.c */
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    long num;
    long data_file_version;
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    char done, read_text_num, read_conf_num;
    int c;
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    extern int modifications;
    extern int pers_pres_conf;
    extern int conf_pres_conf;
    extern int motd_conf;
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    extern Text_no motd_of_lyskom;
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    extern int kom_news_conf;
       
    read_text_num = 0;
    read_conf_num = 0;
        
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    pers_arr = smalloc(sizeof(*pers_arr) * param.max_conf);
    conf_arr = smalloc(sizeof(*conf_arr) * param.max_conf);
    text_arr = smalloc(sizeof(*text_arr) * param.max_text);
    name_list = smalloc(sizeof(*name_list) * param.max_conf);

    for (i = 0; i < param.max_conf; i++)
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	conf_arr[i] = NULL;
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    for (i = 0; i < param.max_conf; i++)
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	pers_arr[i] = NULL;
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    for (i = 0; i < param.max_text; i++)
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	text_arr[i] = NULL;
    
    
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    new_text_file = NULL;
    
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    if ( (text_file = fopen(param.textfile_name, "rb")) == NULL )
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    {
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	perror(param.textfile_name);
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	restart_kom("ERROR: init_cache: can't open text file %s.\n",
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		    param.textfile_name);
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    }

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    if ( is_clean(param.datafile_name) )
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    {
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	data_file_version = get_version(param.datafile_name);
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	if ( (fp = fopen(param.datafile_name, "rb")) == NULL )
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	{
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	    kom_log("WARNING: init_cache: can't open datafile.\n");
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	    return FAILURE;
	}
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	kom_log("MSG: init_cache: using datafile.\n");
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    }
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    else if ( is_clean(param.backupfile_name) )
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    {
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	data_file_version = get_version(param.backupfile_name);
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	if ( (fp = fopen(param.backupfile_name, "rb")) == NULL )
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	{
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	    kom_log("WARNING: init_cache: can't open backupfile.\n");
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	    return FAILURE;
	}
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	kom_log("MSG: init_cache: using backup file.\n");
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    }
    else
    {
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	kom_log("WARNING: init_cache: can't find old data base.\n");
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	return FAILURE;
    }

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    /*
     * If no output format has been selected, use the input format
     */

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    if (oformat == -1)
        oformat = data_file_version;

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    /*
     * Read file header
     */
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    set_input_format(data_file_version);
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    switch (data_file_version)
    {
    case 0:
	fseek(fp, 6, SEEK_SET);	/* skip clean/dirty flag. */
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	next_free_num = fparse_long(fp);	  /* NEXT_FREE_NUM */
	read_conf_num = 1;
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        if (vflag)
        {
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            kom_log("Data file version is '%ld'\n", data_file_version);
            kom_log("Reading %d conferences, starting at pos %ld.\n",
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                next_free_num-1, (unsigned long)ftell(fp));
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        }
        break;
    case 1:
	fseek(fp, 12, SEEK_SET);
        if (vflag)
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            kom_log("Data file version is '%ld'\n", data_file_version);
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        break;
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    case 2:
        fseek(fp, 33, SEEK_SET);
        if (vflag)
            kom_log("Data file version is '%ld'\n", data_file_version);
        break;
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    default:
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        restart_kom("Unknown input file format: %ld\n", data_file_version);
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    }
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    done = 0;
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    /*
     * Loop over records in the database. For a version zero database,
     * loop next_free_num times and for a version one database, loop
     * until the end of the file or until done is set
     */
    
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    for ( i = 1;
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          (data_file_version == 0 && i < next_free_num && !feof(fp)) ||
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          (data_file_version == 1 && !done) ||
          (data_file_version == 2 && !done);
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          i++ )
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    {
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	num = i;
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	fskipwhite(fp);
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	switch(c = getc(fp))
	{
        case EOF:
            switch (data_file_version)
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            {
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            case 0:
                restart_kom("Unexpected end-of-file reading conferences "
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                            "in data file version %ld.",
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                            data_file_version);
                break;

            case 1:
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	    case 2:
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                done = 1;
                break;

            default:
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                restart_kom("Unknown input file format: %ld\n",
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                            data_file_version);
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            }
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            break;
            
	case '@':
            switch (data_file_version)
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            {
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            case 0:
                conf_arr[num] = NULL;
                break;
            case 1:
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            case 2:
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		restart_kom("@ record in data file version %ld at %lu.\n",
                            data_file_version, (unsigned long)ftell(fp));
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                break;
            default:
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                restart_kom("Unknown input file format: %ld\n",
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                            data_file_version);
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            }
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            break;

	case 'I':
            switch (data_file_version)
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            {
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            case 0:
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                restart_kom("I record in data file version %ld at %lu.\n",
                            data_file_version, (unsigned long)ftell(fp));
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                break;
            case 1:
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            case 2:
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                if (fparse_info(fp, &kom_info) != OK)
                    restart_kom("Invalid I record in data file version %ld at %lu.\n",
                                data_file_version, (unsigned long)ftell(fp));
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                if (pers_pres_conf != -1)
                {
                    modifications += (kom_info.pers_pres_conf !=
                                      pers_pres_conf);
                    kom_info.pers_pres_conf = pers_pres_conf;
                }
                if (conf_pres_conf != -1)
                {
                    modifications += (kom_info.conf_pres_conf !=
                                      conf_pres_conf);
                    kom_info.conf_pres_conf = conf_pres_conf;
                }
                if (motd_conf != -1)
                {
                    modifications += (kom_info.motd_conf !=
                                      motd_conf);
                    kom_info.motd_conf = motd_conf;
                }
                if (kom_news_conf != -1)
                {
                    modifications += (kom_info.kom_news_conf !=
                                      kom_news_conf);
                    kom_info.kom_news_conf = kom_news_conf;
                }
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                if (motd_of_lyskom != (Text_no)-1)
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                {
                    modifications += (kom_info.motd_of_lyskom !=
                                      motd_of_lyskom);
                    kom_info.motd_of_lyskom = motd_of_lyskom;
                }
                break;
            default:
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                restart_kom("Unknown input file format: %ld\n",
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                            data_file_version);
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            }
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            break;
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	case 'C':
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            switch (data_file_version)
            {
            case 0:
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                restart_kom("C record in data file version %ld at %lu.\n",
                            data_file_version, (unsigned long)ftell(fp));
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                break;

            case 1:
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            case 2:
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                num = fparse_long(fp);
                if (conf_arr[num])
                    free_conference(conf_arr[num]);
                conf_arr[num] = alloc_conference();
                if (fparse_conference(fp, conf_arr[num]) != OK)
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                    restart_kom("init_cache(): %s. i == %lu\n", 
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                                "fparse_conference failed", i);
                name_list[num] = EMPTY_STRING;
                s_strcpy(&name_list[num], conf_arr[ num ]->name);
                break;

            default:
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                restart_kom("Unknown input file format: %ld\n",
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                            data_file_version);
            }
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	    break;

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	case 'P':
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            switch (data_file_version)
            {
            case 0:
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                restart_kom("P record in data file version %ld at