dbck-cache.c 21.9 KB
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/*
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 * $Id: dbck-cache.c,v 0.23 1996/02/23 16:00:12 byers Exp $
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 * Copyright (C) 1991, 1992, 1993, 1994, 1995  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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static char *rcsid = "$Id: dbck-cache.c,v 0.23 1996/02/23 16:00:12 byers Exp $";
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#include "rcs.h"
USE(rcsid);
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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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#ifdef HAVE_STDARG_H
#  include <stdarg.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 "tmp-limits.h"
#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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/*
 * All functions that can fail sets kom_errno to a suitable value
 * if they fail.
 */
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Person		* pers_arr[ MAX_CONF ];
Conference 	* conf_arr[ MAX_CONF ];
Conf_type	  conf_type_arr[ MAX_CONF ];
String		  name_list [ MAX_CONF ]; /* "cache" list */
			        	  /* Global var auto init to NULL */
int		  next_free_num = 1;

Text_stat 	* text_arr[ MAX_TEXT ];
int next_text_num = 1;

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Info		  kom_info =
{
#include "version.incl"
    ,				/* version */
    1,				/* conf_pres_conf */
    2,				/* pers_pres_conf */
    3,				/* motd_conf */
    4,				/* kom_news_conf */
    0				/* motd_of_lyskom */
};


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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;\
    printf("Text_no out of range 1 ... %d ", next_text_num); \
    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;\
    printf("Text_no out of range 1 ... %d ", next_text_num); \
    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;
}



#define IMPL(retval) if (1) { fflush(stderr); fflush(stdout); abort(); }


/*
 * 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);
    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");

    if ( next_free_num >= MAX_CONF )
    {
	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 )
    {
	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 )
    {
	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 )
    {
	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;
    
    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)
	    != the_string.len )
	{
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	    log("%s read enough characters of text %d\n",
		"WARNING: cached_get_text: couldn't",
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		text);
	}
		    
	return the_string;
    }
}

extern Text_stat *	/* NULL on error */
cached_get_text_stat(	Text_no		text )
{
    kom_errno = KOM_NO_SUCH_TEXT;
    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);

    if ( tno >= MAX_TEXT )
    {
	kom_errno = KOM_INDEX_OUT_OF_RANGE;
	next_text_num = MAX_TEXT;
	
	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 ) {
	log("WARNING: cached_create_text: Couldn't write the text %d\n",
	    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 )
    {
	log("cached_flush_text(%lu, string): only text %lu exists.",
	    (u_long) text_no, (u_long) next_text_num);
	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)
	!= message.len )
    {
	log("WARNING: cached_flush_text: Couldn't write the text %d\n",
	    text_no);
    }

    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)
{
    return ( conf_arr [ conf_no ]->texts.first_local_no
	    - 1 + conf_arr [ conf_no ]->texts.no_of_texts );
}

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

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

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

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


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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;

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

#ifdef TIME_SYNC
static long
timerdiff(struct timeval a,
	   struct timeval b)
{
    return a.tv_sec - b.tv_sec;
}
#endif

extern void			/* Write out everything. */
cache_sync(void)
{
    FILE *fp;
    int i;
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    extern long oformat;
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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 ( rename(param.datafile_name, param.backupfile_name) != 0 )
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	    log("WARNING: cache_sync: can't backup.\n");
    }
    else
	log("cache_sync: datafile not clean. No backup taken.\n");
    
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    if ( (fp=fopen(param.datafile_name, "w") ) == NULL )
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    {
	log("WARNING: cache_sync: can't open file to save in.\n");
	return;
    }

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    if (oformat == 0)
	fprintf(fp, "DIRTY\n");		 /* DIRTY-FLAG */
    else
	fprintf(fp, "DIRTY:%05ld\n", oformat);
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    if (oformat == 0)
	fprintf(fp, "%d\n", next_free_num);	  /* NEXT_FREE_NUM */
    else
      {
	fprintf(fp, "#C %d\n", next_free_num);
	fprintf(fp, "#T %d\n", next_text_num);
      }
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    for ( i = 1; i < next_free_num; i++ ) /* CONFS */
    {
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	if ( conf_arr[ i ] == NULL && oformat == 0)
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	    fprintf(fp, "@");
	else
	{
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	    if (oformat == 0)
		fprintf(fp, "+ ");
	    else
		fprintf(fp, "C %d ", i);
	    
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	    foutput_conference(fp, conf_arr[ i ]);
	}
	putc('\n', fp);
    }
#ifdef TIME_SYNC
    getrusage(0, &after_confs);
    time(&ac);
#endif
    for ( i = 1; i < next_free_num; i++ ) /* PERSONS */
    {
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	if ( pers_arr[ i ] == NULL)
	{
	    if (oformat == 0)
		fprintf(fp, "@\n");
	}
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	else
	{
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	    if (oformat == 0)
		fprintf(fp, "+ %dH", PASSWD_LEN);
	    else
		fprintf(fp, "P %d %dH", i, PASSWD_LEN);
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	    fwrite(pers_arr[ i ]->pwd, PASSWD_LEN, 1, fp);
	    foutput_person(fp, pers_arr[ i ]);
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	    putc('\n', fp);
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	}
    }
#ifdef TIME_SYNC
    getrusage(0, &after_persons);
    time(&ap);
#endif

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    if (oformat == 0)
	fprintf(fp, "%d\n", next_text_num);	/* NEXT_TEXT_NUM */
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    for ( i = 1; i < next_text_num; i++ ) /* TEXT_STATS */
    {
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	if ( text_arr[ i ] == NULL && oformat == 0)
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	    fprintf(fp, "@");
	else
	{
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	    if (oformat == 0)
		fprintf(fp, "+ ");
	    else
		fprintf(fp, "T %d ", i);
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	    foutput_text_stat(fp, text_arr[ i ]);
	}
	putc('\n', fp);
    }

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    if (oformat != 0)
    {
	putc('$', fp);
	putc('\n', fp);
    }
    
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#ifdef TIME_SYNC
    getrusage(0, &after_text_stats);
    time(&ats);

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

    rewind(fp);
    fprintf(fp, "CLEAN");
    fclose(fp);

#ifdef TIME_SYNC
    log("Sync ready.\n"
    	"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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    {
	log("Can't open file to save new texts. Goodbye.\n");
	exit(1);
    }
}

extern Success
init_cache(void)
{
    FILE *fp = NULL;
    int i;
    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;
    char done, read_text_num, read_conf_num;

    for (i = 0; i < MAX_CONF; i++)
	conf_arr[i] = NULL;
    for (i = 0; i < MAX_CONF; i++)
	pers_arr[i] = NULL;
    for (i = 0; i < MAX_TEXT; i++)
	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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	{
	    log("WARNING: init_cache: can't open datafile.\n");
	    return FAILURE;
	}
	log("MSG: init_cache: using datafile.\n");
    }
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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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	{
	    log("WARNING: init_cache: can't open backupfile.\n");
	    return FAILURE;
	}
	log("MSG: init_cache: using backup file.\n");
    }
    else
    {
	log("WARNING: init_cache: can't find old data base.\n");
	return FAILURE;
    }

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    if (data_file_version == 0)
	fseek(fp, 6, SEEK_SET);	/* skip clean/dirty flag. */
    else
	fseek(fp, 12, SEEK_SET);

    if (data_file_version == 0)
      {
	next_free_num = fparse_long(fp);	  /* NEXT_FREE_NUM */
	read_conf_num = 1;
      }
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    if ( vflag )
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	log("Data file version is '%c'\n", data_file_version);
    
    if ( vflag && data_file_version == 0)
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	log("Reading %d conferences, starting at pos %d.\n",
	    next_free_num-1, ftell(fp));

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    done = 0;
    for ( i = 1;
	 !done && (i < next_free_num || data_file_version != 0);
	 i++ ) /* CONFS */
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    {
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	num = i;
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	fskipwhite(fp);
	switch(getc(fp))
	{
	case '@':
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	    if (data_file_version != 0)
		restart_kom("init_cache(): empty record in new datafile.\n");
	    conf_arr[ num ] = NULL;
	    break;

	case 'I':
	    if (data_file_version == 0)
		restart_kom("init_cache(): new type record in old file\n");
	    kom_info.conf_pres_conf = fparse_long(fp);
	    kom_info.pers_pres_conf = fparse_long(fp);
	    kom_info.motd_conf = fparse_long(fp);
	    kom_info.kom_news_conf = fparse_long(fp);
	    kom_info.motd_of_lyskom = fparse_long(fp);
	    break;
	    
	case 'C':
	    if (data_file_version == 0)
		restart_kom("init_cache(): new type record in old file\n");

	    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)
		restart_kom("init_cache(): %s. i == %d\n", 
			    "fparse_conference failed", i);
	    name_list[num] = EMPTY_STRING;
	    s_strcpy(&name_list[num], conf_arr[ num ]->name);
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	    break;

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	case 'P':
	    if (data_file_version == 0)
		restart_kom("init_cache(): new type record in old file\n");
	    num = fparse_long(fp);
	    if (pers_arr[num])
		free_person(pers_arr[num]);
	    pers_arr[num] = alloc_person();
	    if ( fparse_person(fp, pers_arr[ num ]) != OK )
		restart_kom("init_cache: fparse_person failed. i == %d\n",
			    i);
	    break;
	    
	case 'T':
	    if (data_file_version == 0)
		restart_kom("init_cache(): new type record in old file\n");

	    num = fparse_long(fp);
	    if (text_arr[num])
		free_text_stat(text_arr[num]);
	    text_arr[ num ] = alloc_text_stat();
	    if ( fparse_text_stat(fp, text_arr[ num ]) != OK )
	    {
		/* Simply ignore the following texts.  The cause of this
		   error might be that the file has been truncated (maybe
		   due to an overfull disk). */
		log("init_cache(): fparse_text_stat failed for text %d.\n%s",
		    i, "All remaining texts are lost.\n");
		next_text_num = i;
		read_text_num = 1;
		truncated_texts = TRUE;
		done = 1;
	    }
	    break;	
    
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	case '+':
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	    if (data_file_version != 0)
		restart_kom("init_cache(): %s\n",
			    "Old type record found in new type file");
	    
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	    conf_arr[ i ] = alloc_conference();
	    if ( fparse_conference(fp, conf_arr[ i ]) != OK )
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		restart_kom("init_cache(): %s. i == %d\n", 
			    "fparse_conference failed", i);
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	    name_list[i] = EMPTY_STRING;
	    s_strcpy(&name_list[i], conf_arr[ i ]->name);
	    break;
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	case '#':
	  if (data_file_version == 0)
	    restart_kom("init_cache(): %s\n",
			"New type record found in old datafile");
	  switch (fgetc(fp))
	  {
	  case 'C':
	      next_free_num = fparse_long(fp);
	      read_conf_num = 1;
	      break;
	  case 'T':
	      next_text_num = fparse_long(fp);
	      read_text_num = 1;
	      break;
	  default:
	      restart_kom("init_cache(): %s\n",
			  "Bad number specification");
	  }
	  break;

	case '-':
	    if (data_file_version == 0)
		restart_kom("init_cache(): %s\n",
			    "New type record found in old datafile");
	    fskipwhite(fp);
	    switch(fgetc(fp))
	    {
	    case 'C':
		num = fparse_long(fp);
		if (conf_arr[num])
		    free_conference(conf_arr[num]);
		conf_arr[num] = NULL;
		break;
	    case 'P':
		num = fparse_long(fp);
		if (pers_arr[num])
		    free_person(pers_arr[num]);
		pers_arr[num] = NULL;
		break;
	    case 'T':
		num = fparse_long(fp);
		if (text_arr[num])
		    free_text_stat(text_arr[num]);
		text_arr[num] = NULL;
		break;
	    }
	    break;

	case '$':
	    done = 1;
	    break;

	default:
	    restart_kom("init_cache(): bad conf format at %d\n", i);
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	}
    }

    if ( vflag )
	log("Reading %d persons, starting at pos %d.\n",
	    next_free_num-1, ftell(fp));

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    if (data_file_version == 0)
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    {
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	for ( i = 1; i < next_free_num; i++ ) /* PERSONS */
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	{
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	    fskipwhite(fp);
	    switch(getc(fp))
	    {
	    case '@':
		pers_arr[ i ] = NULL;
		break;

	    case '+':
		pers_arr[ i ] = alloc_person();
		if ( fparse_person(fp, pers_arr[ i ]) != OK )
		    restart_kom("init_cache: fparse_person failed. i == %d\n",
				i);
		break;
	    }
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	}

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	next_text_num = fparse_long(fp);	/* NEXT_TEXT_NUM */
	read_text_num = 1;
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	if ( vflag )
	    log("Reading %d texts, starting at pos %d.\n",
		next_text_num-1, ftell(fp));
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	for ( i = 1; i < next_text_num; i++ ) /* TEXT_STATS */
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	{
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	    fskipwhite(fp);
	    switch(getc(fp))
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	    {
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	    case '@':
		text_arr[ i ] = NULL;
		break;

	    case '+':
		text_arr[ i ] = alloc_text_stat();
		if ( fparse_text_stat(fp, text_arr[ i ]) != OK )
		{
		    /* Simply ignore the following texts.  The cause of this
		       error might be that the file has been truncated (maybe
		       due to an overfull disk). */

		    log("init_cache(): fparse_text_stat failed for text %d.\n%s",
			i, "All remaining texts are lost.\n");
		    next_text_num = i;
		    truncated_texts = TRUE;
		}
		break;
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	    }
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	}
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    } /* if (datafile_version == 0) */
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    log("Read %d confs/persons and %d texts, eof at %d\n",
	next_free_num-1, next_text_num-1, ftell(fp));

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    if (read_text_num == 0 || read_conf_num == 0)
      restart_kom("init_cache(): Failed to read next_conf or text num.\n");
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    fclose(fp);

    return OK;
}