aux-items.c 36.2 KB
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/*
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 * $Id: aux-items.c,v 1.7 1998/12/26 22:40:27 byers Exp $
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 * Copyright (C) 1994, 1995, 1996  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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#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

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#include <stdio.h>
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#include <setjmp.h>
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#include <assert.h>
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#include "kom-types.h"
#include "manipulate.h"
#include "aux-items.h"
#include "kom-errno.h"
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#include "kom-memory.h"
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#include "async.h"
#include "com.h"
#include "connections.h"
#include "server/smalloc.h"
#include "cache.h"
#include "s-string.h"
#include "lyskomd.h"
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#include "kom-config.h"
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#include "regex.h"
#include "log.h"
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#include "services.h"
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#define AUX_ADJUST_FLAG(flg) item->flags.flg = (def->clear_flags.flg)?0:((def->set_flags.flg)?1:item->flags.flg)

Aux_item_definition     *aux_item_definition_list = NULL;
unsigned long            num_aux_item_definitions = 0;
static Aux_item_definition compiled_aux_items[] =
{
};

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void aux_item_trigger_mark_text(Aux_item_trigger_data *);
void aux_item_trigger_unmark_text(Aux_item_trigger_data *);

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static Aux_item_trigger_mapping
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aux_item_triggers [] =
{
    { "mark-text", aux_item_trigger_mark_text },
    { "unmark-text", aux_item_trigger_unmark_text },
    { NULL, NULL }
};

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Aux_item_definition empty_aux_item_definition =
{
    NULL,                   /* Name */           
    0,                      /* Tag */            
    { 0,0,0,0,0,0,0,0 },    /* Clear flags */    
    { 0,0,0,0,0,0,0,0 },    /* Set flags */      
    0,                      /* Author only */    
    0,                      /* Supervisor only */
    0,                      /* Unique */         
    0,                      /* Can't delete */   
    0,                      /* Inherit limit */  
    FALSE,                  /* Texts */
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    0,
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    FALSE,                  /* Confs */
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    0,
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    FALSE,                  /* Letterbox */
    FALSE,                  /* System */
    NULL,                   /* Validate */
    NULL,                   /* Cached regexp */
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    0, NULL,
    0, NULL,
    0, NULL,
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    NULL                    /* Next */
};

    


/*
 * simple_aux_item is the default definition for simple
 * items (non-reserved tags)
 */

static Aux_item_definition simple_aux_item =
{
    "simple",               /* Name */           
    0,                      /* Tag */            
    { 0,0,0,0,0,0,0,0 },    /* Clear flags */    
    { 0,0,0,0,0,0,0,0 },    /* Set flags */      
    0,                      /* Author only */    
    0,                      /* Supervisor only */
    0,                      /* Unique */         
    0,                      /* Can't delete */   
    0,                      /* Inherit limit */  
    TRUE,                   /* Texts */
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    0,
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    TRUE,                   /* Confs */
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    0,
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    TRUE,                   /* Letterbox */
    TRUE,                   /* System */
    NULL,                   /* Validate regexp */       
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    NULL,                   /* Cached regexp */
    0, NULL,                /* Add triggers */
    0, NULL,                /* Delete triggers */
    0, NULL,                /* Undelete triggers */
    NULL
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};


/* Forward declarations */

static Bool
aux_item_check_unique(Aux_item *item,
                      Aux_item_definition *xdef,
                      Aux_item_list *add_to_list,
                      unsigned long start_looking_at);


/*
 * aux_item_default_definition
 *
 * Return the default definition of ITEM or NULL if ITEM cannot
 * be created without an explicit definition
 */

static Aux_item_definition *
aux_item_default_definition(Aux_item *item)
{
    /* A predefined aux_item that we didn't find a definition for is
       illegal. */

    if (AUX_IS_ILLEGAL(item->tag))
        return NULL;

    if (AUX_IS_PREDEFINED(item->tag))
        return NULL;

    
    /* This might be an extended item. This code is very horrendous,
       execially if you take a closer look at the AUX_CHECK_BIT macro.
       I wrote it this way because I think it will work in a
       wrong-endian environment, and I was unsure of how well simple
       masking would. */
    /* MMMM XFUP SSSS CCCC NNNN NNNN NNNN NNNN */

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/*
  tmp = item->tag;

  extended                        = (tmp & 0x07000000) ? 1 : 0;
  def_s.author_only               = (tmp & 0x04000000) ? 1 : 0;
  def_s.one_per_person            = (tmp & 0x02000000) ? 1 : 0;
  def_s.may_not_delete            = (tmp & 0x01000000) ? 1 : 0;
  def_s.set_flags.deleted         = (tmp & 0x00700000) ? 1 : 0;
  def_s.set_flags.inherit         = (tmp & 0x00400000) ? 1 : 0;
  def_s.set_flags.secret          = (tmp & 0x00200000) ? 1 : 0;
  def_s.set_flags.hide_creator    = (tmp & 0x00100000) ? 1 : 0;
  def_s.clear_flags.deleted       = (tmp & 0x00070000) ? 1 : 0;
  def_s.clear_flags.inherit       = (tmp & 0x00040000) ? 1 : 0;
  def_s.clear_flags.secret        = (tmp & 0x00020000) ? 1 : 0;
  def_s.clear_flags.hide_creator  = (tmp & 0x00010000) ? 1 : 0;

  def_s.tag = item->tag;
  def_s.inherit_limit = 0;
  def_s.name = "extended-default";


  / * If it wasn't extended, then it was simple, because it sure
  wasn't predefined. * /

  if (!extended)
  {
  return &simple_aux_item;
  }

  return &def_s;
*/

    return &simple_aux_item;
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}


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/*
 * aux_item_find_trigger
 */

Aux_item_trigger
aux_item_find_trigger(char *trigger_name)
{
    unsigned long i = 0;

    while (aux_item_triggers[i].name != NULL)
    {
        if (!strcmp(aux_item_triggers[i].name, trigger_name))
            return aux_item_triggers[i].function;
        i += 1;
    }
    return NULL;
}

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/*
 * find_aux_item_definition
 *
 * Return the definition of ITEM or NULL if it does not
 * have a valid information.
 */

Aux_item_definition *
find_aux_item_definition(Aux_item *item)
{
    Aux_item_definition *def;

    def = aux_item_definition_list;
    while (def != NULL)
    {
        if (def->tag == item->tag)
            return def;
        def = def->next;
    }

    return aux_item_default_definition(item);
}


/* 
 * ======================================================================
 * UTILITY FUNCTIONS
 * ======================================================================
 */
 
/*
 * initialize_aux_items
 *
 * Initialize this code and its data structures
 */

void
aux_item_definition_add(Aux_item_definition *def)
{
    Aux_item_definition     *new_definition;

    new_definition = smalloc(sizeof(Aux_item_definition));
    if (new_definition == NULL)
    {
        restart_kom("out of memory adding aux-item definitionn");
    }
    *new_definition = *def;
    num_aux_item_definitions += 1;

    new_definition->next = aux_item_definition_list;
    aux_item_definition_list = new_definition;
}

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/*
 * Compile the verification regexp for the definition in DEF
 * and put the result somewhere convenient.
 */

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static void
aux_item_definition_cache_regexp(Aux_item_definition *def)
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{
    struct re_pattern_buffer   *pat_buf;
    const char                 *errmsg;

    re_syntax_options = RE_SYNTAX_POSIX_EXTENDED;
            
    def->cached_re_buf = smalloc(sizeof(*pat_buf));
    if (def->cached_re_buf == NULL)
    {
        log("Out of memory compiling aux-item regexp %lu (%s).\n",
            def->tag,
            def->name);
        return;
    }
    pat_buf = def->cached_re_buf;
    pat_buf->translate = DEFAULT_COLLAT_TAB;
    pat_buf->translate = NULL;
    pat_buf->fastmap = 0;
    pat_buf->allocated = 0;
    pat_buf->buffer = 0;

    if ((errmsg =
         re_compile_pattern(def->validate_regexp,
                            strlen(def->validate_regexp),
                            pat_buf))
        != NULL)
    {
        log("%s in validate regexp of aux-item definition %lu (%s).\n",
                errmsg,
                def->tag,
                def->name);
        if (def->cached_re_buf)
            sfree(def->cached_re_buf);
        def->cached_re_buf = NULL;
        return;
    }
}

void
initialize_aux_items(char *aux_def_file)
{
    unsigned long                i;
    Aux_item_definition         *def;

    /* Set up precompiled items */

    for (i = 0;
         i < (sizeof(compiled_aux_items)/sizeof(*compiled_aux_items));
         i++)
    {
        aux_item_definition_add(&compiled_aux_items[i]);
    }

    /* Read definitions from configuration file */

    parse_aux_item_definitions(aux_def_file);

    def = aux_item_definition_list;
    while (def != NULL)
    {
        if (def->validate_regexp != NULL)
        {
            aux_item_definition_cache_regexp(def);
        }
        def = def->next;
    }
}


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/* TRIGGER THINGS */


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static void
aux_item_call_add_triggers(Aux_item_definition *def,
			   short object_type,
			   unsigned long item_index,
			   unsigned long integer_argument,
			   void     * pointer_argument)
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{
    unsigned long i;
    Aux_item_trigger_data data;
    
    data.action = AUX_ITEM_ADD_ACTION;
    data.object_type = object_type;
    data.item_index = item_index;
    data.object_no = integer_argument;
    data.object = pointer_argument;

    for (i = 0; i < def->num_add_triggers; i++)
    {
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        (*(def->add_triggers[i]))(&data);
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    }
}

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static void
aux_item_call_delete_triggers(Aux_item_definition *def,
			     short object_type,
			     unsigned long item_index,
			     unsigned long integer_argument,
			     void     * pointer_argument)
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{
    unsigned long i;
    Aux_item_trigger_data data;
    
    data.action = AUX_ITEM_DELETE_ACTION;
    data.object_type = object_type;
    data.item_index = item_index;
    data.object_no = integer_argument;
    data.object = pointer_argument;

    for (i = 0; i < def->num_delete_triggers; i++)
    {
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        (*(def->delete_triggers[i]))(&data);
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    }
}

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static void
aux_item_call_undelete_triggers(Aux_item_definition *def,
				short object_type,
				unsigned long item_index,
				unsigned long integer_argument,
				void     * pointer_argument)
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{
    unsigned long i;
    Aux_item_trigger_data data;
    
    data.action = AUX_ITEM_UNDELETE_ACTION;
    data.object_type = object_type;
    data.item_index = item_index;
    data.object_no = integer_argument;
    data.object = pointer_argument;

    for (i = 0; i < def->num_undelete_triggers; i++)
    {
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        (*(def->undelete_triggers[i]))(&data);
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    }
}
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/*
 * prepare_aux_item_list
 *
 * Prepare items in LIST for checking and addition. You *have*
 * to call this before any of the addition or checking
 * function. CREATOR is the person who wants to create the
 * item list. This function will set various fields in the
 * items. UTSL.
 */

void
prepare_aux_item_list(Aux_item_list *list,
                      Pers_no creator)
{
    unsigned long i;

    if (list == NULL)
        return;
    
    for (i = 0; i < list->length; i++)
    {
        prepare_aux_item(&list->items[i], creator, NULL);
    }
}

void prepare_aux_item(Aux_item *item,
                      Pers_no creator,
                      Aux_item_definition *def)
{
    if (item == NULL)
        return;
    def = def ? def : find_aux_item_definition(item);
    if (def == NULL)
        return;

    AUX_ADJUST_FLAG(inherit);
    AUX_ADJUST_FLAG(secret);
    AUX_ADJUST_FLAG(hide_creator);
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    AUX_ADJUST_FLAG(dont_garb);
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    AUX_ADJUST_FLAG(reserved3);
    AUX_ADJUST_FLAG(reserved4);
    AUX_ADJUST_FLAG(reserved5);
    /* AUX_ADJUST_FLAG(deleted); */
    item->flags.deleted = 0;

    if (def->inherit_limit != 0 &&
        (item->inherit_limit > def->inherit_limit ||
         item->inherit_limit == 0))
        item->inherit_limit = def->inherit_limit;

    item->creator = creator;
}

/*
 * aux_item_add_perm
 *
 * Check if it is alright to add an aux_item.
 *
 * ITEM is the item that you want to add.
 * DEF is the item's definition or NULL.
 * ITEM_CREATOR is the person who wants to create the item.
 * OBJECT_CREATOR is the person who created the object to which
 *     the item might be added. For texts it is the author, for
 *     persons it is the person and for conferences it is the
 *     conference supervisor.
 * OWNER_CHECK is TRUE when this function is supposed to check author
 *     and supervisor-brelated flags. The only case when this is to
 *     be FALSE is when checking author or supervisor makes not sense,
 *     such as when creating a completely new conference.
 * ADD_TO_LIST is the item list to add to, or NULL.
 * START_LOOKING_AT is the first index in add_to_list to start
 *     looking at for possible duplicates.
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 * CREATING is true if we are checking while creating an object
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 */

Bool
aux_item_add_perm(Aux_item *item,
                  Aux_item_definition *def,
                  Pers_no item_creator,
                  Pers_no object_creator,
                  Bool owner_check,
                  Aux_item_list *add_to_list,
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                  unsigned long start_looking_at,
                  Bool creating,
                  short object_type
                  )
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{
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    short can_add_when = 0;
    
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    kom_errno = KOM_NO_ERROR;

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    def = def ? def : def = find_aux_item_definition(item);

    /* Can't create an item with no definition */
      
    if (def == NULL)
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    {
        kom_errno = KOM_ILL_AUX;
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        return FALSE;
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    }
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    switch (object_type)
    {
    case TEXT_OBJECT_TYPE: can_add_when = def->text_a; break;
    case CONF_OBJECT_TYPE: can_add_when = def->conf_a; break;
    default: can_add_when = 0;
    }

    if (can_add_when)
    {
        if (!((creating  && (can_add_when & AUX_ITEM_ADD_ON_CREATE)) ||
              (!creating && (can_add_when & AUX_ITEM_ADD_ON_MODIFY))))
        {
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            kom_errno = KOM_AUX_PERM;
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            return FALSE;
        }
    }

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    if (def->author_only &&
        owner_check &&
        object_creator != item_creator &&
        !is_strictly_supervisor(object_creator, NULL, item_creator, NULL) &&
        !(item_creator == ACTPERS && ENA(wheel, 8)))
    {
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        kom_errno = KOM_AUX_PERM;
        return FALSE;
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    }

    if (def->supervisor_only &&
         owner_check &&
        !is_strictly_supervisor(object_creator, NULL, item_creator, NULL) &&
        !(item_creator == ACTPERS && ENA(wheel,8)))
    {
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        kom_errno = KOM_AUX_PERM;
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        return FALSE;
    }

    /* Even the administrator can't override this */

    if (!aux_item_check_unique(item, def, add_to_list, start_looking_at))
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    {
        kom_errno = KOM_AUX_PERM;
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        return FALSE;
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    }
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    /* Check the contents */

    if (def->validate_regexp)
    {
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        /* If regexp is not cached, cache it */
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        if (def->cached_re_buf == NULL)
            aux_item_definition_cache_regexp(def);

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        /* If it's still not cached, then ignore it. Can't add item. */
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        if (def->cached_re_buf == NULL)
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        {
            kom_errno = KOM_ILL_AUX;
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            return FALSE;
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        }
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        switch ( re_search (def->cached_re_buf,
                            item->data.string, s_strlen(item->data),
                            0, s_strlen(item->data),
                            NULL) )
        {
        case -1:
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            kom_errno = KOM_ILL_AUX;
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            return FALSE;
        case -2:
            log("Internal error in regex matching aux-item data.");
            break;
        default:
            /* Matched */
            break;
        }
    }

    return TRUE;
}


/*
 * aux_item_check_unique
 *
 * Check whether there are items that block creation of a new item.
 * ITEM is the item we want to add.
 * DEF is the item's definitioon
 * ADD_TO_LIST is the list we want to add to
 * START_LOOKING_AT is the first index in the list to look at.
 */

static Bool
aux_item_check_unique(Aux_item *item,
                      Aux_item_definition *def,
                      Aux_item_list *add_to_list,
                      unsigned long start_looking_at)
{
    unsigned long i;

    if (add_to_list == NULL ||
        item == NULL ||
        start_looking_at >= add_to_list->length)
        return TRUE;

    def = def ? def : find_aux_item_definition(item);
    if (def == NULL || !def->one_per_person)
        return TRUE;

    for (i = start_looking_at; i < add_to_list->length; i++)
    {
        if (add_to_list->items[i].tag == item->tag &&
            add_to_list->items[i].creator == item->creator &&
            !add_to_list->items[i].flags.deleted)
            return FALSE;
    }

    return TRUE;
}


/*
 * aux_inherit_items
 *
 * Inherit aux items from PARENT to TARGET. COUNTER is a pointer
 * to the aux_no counter in the object being inherited to and CREATOR
 * is the author or equivalent of the target object.
 */

void
aux_inherit_items(Aux_item_list *target,
                  Aux_item_list *parent,
                  unsigned long *counter,
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                  Pers_no target_creator,
                  Bool creating,
                  short object_type,
                  unsigned long object_no,
                  void *object)
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{
    int i;
    Aux_item item;
    Aux_item_definition *def;

    if (!target || !parent)
        return;

    for (i = 0; i < parent->length; i++)
    {
        if (parent->items[i].flags.inherit &&
            !parent->items[i].flags.deleted &&
            parent->items[i].inherit_limit != 1)
            {
            def = find_aux_item_definition(&parent->items[i]);
            if (def == NULL ||
                !aux_item_add_perm(&parent->items[i],
                                   def,
                                   parent->items[i].creator,
                                   target_creator,
                                   TRUE,
                                   target,
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                                   0,
                                   creating,
                                   object_type
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                                   ))
                continue;

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            copy_aux_item(&item, &parent->items[i]);
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            prepare_aux_item(&item, parent->items[i].creator, def);
            if (item.inherit_limit != 0)
                item.inherit_limit -= 1;
            
            ADD_AUX_ITEM(*target, item, *counter);
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            aux_item_call_add_triggers(def,
                                       object_type,
                                       target->length - 1,
                                       object_no,
                                       object);
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        }
    }
}

/*
 * filter_aux_item_list
 *
 * Filter out information in ORIGINAL that VIEWER is not allowed
 * to see. Copies of the items are placed in RESULT. VIEWER_P is
 * the Person corresponding to viewer or NULL. All memory is
 * allocated with tmp_alloc
 */

void
filter_aux_item_list(Aux_item_list *original,
                     Aux_item_list *result,
                     Pers_no        viewer,
                     Person        *viewer_p)
{
    Aux_item        *orig_aux;
    unsigned long    from, to;

    result->items = tmp_alloc(original->length * sizeof (Aux_item));
    result->length = 0;
    to = 0;

    for (from = 0; from < original->length; from++)
    {
        orig_aux = &original->items[from];
        if ( orig_aux->flags.secret &&
             !is_supervisor(orig_aux->creator,NULL, viewer, viewer_p) &&
             !ENA(admin, 4) )
            continue;

        result->items[to] = *orig_aux;

        if (orig_aux->flags.hide_creator &&
             !is_supervisor(orig_aux->creator,NULL, viewer, viewer_p) &&
             !ENA(admin, 4) )
            result->items[to].creator = 0;

        result->length += 1;
        to += 1;
    }
}

/*
 * check_delete_aux
 *
 * Return TRUE if ACTPERS may delete ITEM. DEF is the item's definition
 * or NULL.
 */

Success
check_delete_aux_item_list(Number_list *items_to_delete,
                           Aux_item_list *list_to_delete_from)
{
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    Aux_item *item;
    Aux_item_definition *def;

    for (i = 0; i < items_to_delete->length; i++)
    {
        if (items_to_delete->data[i] == 0)
            continue;


        /* Get pointer to the item and to its definition */

        if ((item = find_aux_item(list_to_delete_from,
                                  items_to_delete->data[i])) == NULL)
        {
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            kom_errno = KOM_AUX_PERM;
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            err_stat = i;
            return FAILURE;
        }


        /* Check all sorts of permissions */

        def = find_aux_item_definition(item);
        if ((def == NULL)                                           ||
            (def->may_not_delete)                                   ||
            (item->creator == 0 && !ENA(wheel, 8))                  ||
            (item->creator != ACTPERS &&
             !is_supervisor(item->creator, NULL, ACTPERS, NULL) &&
             !ENA(wheel,8)))
        {
            kom_errno = KOM_AUX_PERM;
            err_stat = i;
            return FAILURE;
        }


        /* For already deleted items, clear them out of the list */

        if (item->flags.deleted)
            items_to_delete->data[i] = 0;
    }

    return OK;
}



/*
 * delete_aux_item_list
 *
 * Mark ITEM as deleted. LIST is the list we're deleting
 * the item from.
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 *
 * Call commit_aux_item_list to make the changes permanent
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 */
 
void
delete_aux_item_list(Number_list *items_to_delete,
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                     Aux_item_list *list_to_delete_from,
                     short object_type,
                     unsigned long object_no,
                     void *object)
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{
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    long i;
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    Aux_item *item;
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    long item_index;
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    for (i = 0; i < items_to_delete->length; i++)
    {
        if (items_to_delete->data[i] == 0)
            continue;
        
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        item_index = find_aux_item_index(list_to_delete_from,
                                         items_to_delete->data[i]);
        if (item_index == -1)
            restart_kom("Call to delete_aux_item_list without call to check_delete_aux_item_list");
        item = &list_to_delete_from->items[item_index];
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        item->flags.deleted = 1;
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        aux_item_call_delete_triggers(find_aux_item_definition(item),
                                      object_type,
                                      item_index,
                                      object_no,
                                      object);
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    }
}

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/*
 * Reverse tentative deletions from an aux-item-list
 * This must be called before commit_aux_item_list is
 * called
 */

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void
undelete_aux_item_list(Number_list *items_to_undelete,
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                       Aux_item_list *list_to_undelete_from,
                       short object_type,
                       unsigned long object_no,
                       void *object)
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{
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    long i;
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    Aux_item *item;
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    long item_index;
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    for (i = 0; i < items_to_undelete->length; i++)
    {
        if (items_to_undelete->data[i] == 0)
            continue;
        
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        item_index = find_aux_item_index(list_to_undelete_from,
                                         items_to_undelete->data[i]);
        if (item_index == -1)
            restart_kom("Call to undelete_aux_item_list without call to check_delete_aux_item_list");
        item = &list_to_undelete_from->items[item_index];
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        item->flags.deleted = 0;
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        aux_item_call_undelete_triggers(find_aux_item_definition(item),
                                        object_type,
                                        item_index,
                                        object_no,
                                        object);
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    }
}

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/*
 * Commit deletions in the aux-item-list. After this has been called
 * undelete_aux_item_list has no effect. The memory associated with
 * the deleted items is not released until the entire list is
 * released from memory or reallocated.
 */

void
commit_aux_item_list(Aux_item_list *list_to_commit)
{
    long i;                     /* Loop index */
    long target;                /* Where to move items when compacting */

    target = 0;
    for (i = 0; i < list_to_commit->length; i++)
    {
        if (list_to_commit->items[i].flags.deleted)
        {
            /* If the item we're looking at is deleted
               release the memory associated with its
               data and then skip it */
            s_clear(&list_to_commit->items[i].data);
            continue;
        }
        else if (target != i)
        {
            /* If we have deleted an item earlier, compact the list */
            list_to_commit->items[target] = list_to_commit->items[i];
            list_to_commit->items[i].data = EMPTY_STRING;
            target += 1;
        }
        else
        {
            /* If we have not deleted an item, bump target up one */
            target += 1;
        }
    }

    /*
      Zero out all the unused slots in the array. This is not
      strictly necessary but looks better and makes finding
      bugs a bit easier
    */

    memset(&list_to_commit->items[target], 0,
           (list_to_commit->length - target) * sizeof(Aux_item));

    /* Target points to one index more than the last non-deleted item */
    list_to_commit->length = target;
}

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/*
 * find_aux_item
 *
 * Return a pointer to the item in LIST with aux_no AUX-NO
 */
 
Aux_item *
find_aux_item(Aux_item_list *list, unsigned long aux_no)
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{
    long item_index = find_aux_item_index(list, aux_no);

    if (item_index == -1)
        return NULL;

    return &list->items[item_index];
}

long
find_aux_item_index(Aux_item_list *list, unsigned long aux_no)
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{
    unsigned long i;

    for (i = 0; i < list->length; i++)
    {
        if (list->items[i].aux_no == aux_no)
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            return i;
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    }

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    return -1;
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}


/* **********************************************************************
 * **********************************************************************
 *
 * The following calls are specific for various types of items. They
 * are here simply to collect all of them in the same place.
 *
 * The following functions are defined for each type
 *
 * X_check_add_aux_item_list(X *obj, Aux_item_list *list,
 *                      Pers_no item_creator)
 *
 * Return OK if CREATOR is allowed to add ITEM or LIST to OBJ.
 * DEF is a pointer to the definition of ITEM or NULL. You must call
 * prepare_aux_item_list before calling these.
 *
 * 
 * X_add_aux_item_list(X *obj, Aux_item_definition *list, Pers_no creator)
 *
 * Add ITEM or all the items in LIST to OBJ. CREATOR is the person
 * adding the items. The creator field of the items are set to
 * creator. This call does not check permissions first. You need
 * to call prepare_aux_item_list before calling these, and you
 * should use X_check_add_aux_item_list or X_check_add_aux_item
 * before calling these.
 *
 *
 */


Success
text_stat_check_add_aux_item_list(Text_stat *text_s,
                                  Aux_item_list *list,
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                                  Pers_no item_creator,
                                  Bool creating)
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{
    Aux_item *item;
    unsigned long i;
    Aux_item_definition *def;

    if (list == NULL)
        return OK;

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    kom_errno = KOM_NO_ERROR;

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    for (i = 0; i < list->length; i++)
    {
        item = &list->items[i];

        def = find_aux_item_definition(item);
        if (def == NULL)
        {
            kom_errno = KOM_ILL_AUX;
            err_stat = i;
            return FAILURE;
        }
        
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        if (!aux_item_add_perm(item,
                               def,
                               item_creator,
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                               text_s?text_s->author:item_creator,
                               TRUE,
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                               text_s?&text_s->aux_item_list:NULL,
                               0,
                               creating,
                               TEXT_OBJECT_TYPE) ||
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            !aux_item_check_unique(item, def, list, i + 1) ||
            !def->texts)
        {
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            kom_errno = kom_errno?kom_errno:KOM_AUX_PERM;
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            err_stat = i;
            return FAILURE;
        }
    }

    return OK;
}

void text_stat_add_aux_item_list(Text_stat *text_s,
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                                 Text_no text_no,
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                                 Aux_item_list *item_list,
                                 Pers_no item_creator)
{
    unsigned long i;

    if (item_list == NULL)
        return;

    text_s->aux_item_list.items = srealloc(text_s->aux_item_list.items,
                                           (text_s->aux_item_list.length +
                                            item_list->length) *
                                           sizeof(Aux_item));
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    for (i = 0; i < item_list->length; i++)
    {
        text_s->highest_aux += 1;
        item_list->items[i].aux_no = text_s->highest_aux;
        item_list->items[i].creator = item_creator;
        item_list->items[i].sent_at = time(NULL);
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        copy_aux_item(
            &text_s->aux_item_list.items[text_s->aux_item_list.length],
            &item_list->items[i]);
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        aux_item_call_add_triggers(
            find_aux_item_definition(&item_list->items[i]),
            TEXT_OBJECT_TYPE,
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            text_s->aux_item_list.length - 1,
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            text_no,
            text_s);
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    }
}


/* ================================================================== */


Success
conf_stat_check_add_aux_item_list(Conference    *conf,
                                  Conf_no        conf_no,
                                  Aux_item_list *list,
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                                  Pers_no        creator,
                                  Bool           creating)
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{
    unsigned long i;
    Aux_item *item;
    Aux_item_definition *def;

    if (list == NULL)
        return OK;
    
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    kom_errno = KOM_NO_ERROR;

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    for (i = 0; i < list->length; i++)
    {
        item = &list->items[i];
        def = find_aux_item_definition(item);
        if (def == NULL)
        {
            kom_errno = KOM_ILL_AUX;
            err_stat = i;
            return FAILURE;
        }

        /* If CONF is non-NULL it already exists. We consider conf to be
         * its own "object creator" since this means that author_only
         * will allow only the supervisor of the conference to set
         * the aux_item (the conference creator is irrelevant here, as
         * everywhere else.) The semantics of supervisor_only will
         * mimic author_only.
         */

        if (!aux_item_add_perm(item,
                               def,
                               creator,
                               conf_no,
                               TRUE,
                               &conf->aux_item_list,
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                               0,
                               creating,
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                               CONF_OBJECT_TYPE)            ||
            !aux_item_check_unique(item, def, list, i + 1)  ||
            (!conf->type.letter_box && !def->confs)         ||
            (conf->type.letter_box && !def->letterboxes))
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        {
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            kom_errno = kom_errno?kom_errno:KOM_AUX_PERM;
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            err_stat = i;
            return FAILURE;
        }
    }

    return OK;
}

void
conf_stat_add_aux_item_list(Conference    *conf,
                            Conf_no        conf_no,
                            Aux_item_list *item_list,
                            Pers_no        item_creator)
{
    unsigned long i;

    if (item_list == NULL)
        return;

    conf->aux_item_list.items = srealloc(conf->aux_item_list.items,
                                         (conf->aux_item_list.length +
                                          item_list->length) *
                                         sizeof(Aux_item));
    for (i = 0; i < item_list->length; i++)
    {
        conf->highest_aux += 1;
        item_list->items[i].aux_no = conf->highest_aux;
        item_list->items[i].creator = item_creator;
        item_list->items[i].sent_at = time(NULL);
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        copy_aux_item(&conf->aux_item_list.items[conf->aux_item_list.length],
                      &item_list->items[i]);
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        aux_item_call_add_triggers(
            find_aux_item_definition(&item_list->items[i]),
            CONF_OBJECT_TYPE,
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            conf->aux_item_list.length - 1,
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            conf_no,
            conf);
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    }
}

Success system_check_add_aux_item_list(Info *info,
                                       Aux_item_list *list,
                                       Pers_no creator)
{
    unsigned long i;
    Aux_item *item;
    Aux_item_definition *def;

    if (list == NULL)
        return OK;
    
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    kom_errno = KOM_NO_ERROR;

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    for (i = 0; i < list->length; i++)
    {
        item = &list->items[i];
        def = find_aux_item_definition(item);
        if (def == NULL)
        {
            kom_errno = KOM_ILL_AUX;
            err_stat = i;
            return FAILURE;
        }

        if (!aux_item_add_perm(item,
                               def,
                               creator,
                               creator,
                               FALSE,
                               &info->aux_item_list,
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                               0,
                               FALSE,
                               OTHER_OBJECT_TYPE) ||
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            !aux_item_check_unique(item, def, list, i + 1) ||
            !def->system)
        {
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            kom_errno = kom_errno?kom_errno:KOM_AUX_PERM;
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            err_stat = i;
            return FAILURE;
        }
    }

    return OK;
}


void
system_add_aux_item_list(Info    *info,
                         Aux_item_list *item_list,
                         Pers_no        item_creator)
{
    unsigned long i;

    if (item_list == NULL)
        return;

    info->aux_item_list.items = srealloc(info->aux_item_list.items,
                                         (info->aux_item_list.length +
                                          item_list->length) *
                                         sizeof(Aux_item));
    for (i = 0; i < item_list->length; i++)
    {
        info->highest_aux_no += 1;
        item_list->items[i].aux_no = info->highest_aux_no;
        item_list->items[i].creator = item_creator;
        item_list->items[i].sent_at = time(NULL);
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        copy_aux_item(&info->aux_item_list.items[info->aux_item_list.length],
                      &item_list->items[i]);
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        info->aux_item_list.length += 1;
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        aux_item_call_add_triggers(
            find_aux_item_definition(&item_list->items[i]),
            INFO_OBJECT_TYPE,
            info->aux_item_list.length - 1,
            0,
            info);
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    }
}

extern Success
query_predefined_aux_items(Number_list *result)
{
    Aux_item_definition *def;

    result->data = tmp_alloc(sizeof(unsigned long) * num_aux_item_definitions);
    if (result->data == NULL)
    {
        restart_kom("Out of memory in query_predefined_aux_items.\n");
    }

    result->length = 0;
    def = aux_item_definition_list;
    while (def != NULL)
    {
        if (def->tag != 0)
        {
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	    assert((unsigned long)result->length < num_aux_item_definitions);
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            result->data[result->length] = def->tag;
            result->length += 1;
        }
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	def = def->next;
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    }

    return OK;
}
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void aux_item_trigger_mark_text(Aux_item_trigger_data *data)
{
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    Text_no text_no;
    Text_stat *text_stat;
    Conference *conf_stat;
    String_size ill_char;

    if (data->object_type != CONF_OBJECT_TYPE)
        return;

    conf_stat = (Conference *)data->object;
    text_no = s_strtol(conf_stat->aux_item_list.items[data->item_index].data,
                       &ill_char,
                       10);

    text_stat = cached_get_text_stat(text_no);

    if (text_stat == NULL)
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        return;
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    text_stat->no_of_marks += 1;
    mark_text_as_changed(text_no);
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}

void aux_item_trigger_unmark_text(Aux_item_trigger_data *data)
{
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    Text_no text_no;
    Text_stat *text_stat;
    Conference *conf_stat;
    String_size ill_char;

    if (data->object_type != CONF_OBJECT_TYPE)
        return;

    conf_stat = (Conference *)data->object;
    text_no = s_strtol(conf_stat->aux_item_list.items[data->item_index].data,
                       &ill_char,
                       10);



    text_stat = cached_get_text_stat(text_no);
    if (text_stat == NULL)
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        return;
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    text_stat->no_of_marks -= 1;
    mark_text_as_changed(text_no);
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}