source: user.c @ 1962ac1

  /********************************************************************\
  * BitlBee -- An IRC to other IM-networks gateway                     *
  *                                                                    *
  * Copyright 2002-2004 Wilmer van der Gaast and others                *
  \********************************************************************/

/* Stuff to handle, save and search buddies                             */

/*
  This program 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 2 of the License, or
  (at your option) any later version.

  This program 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 with
  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
  if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  Suite 330, Boston, MA  02111-1307  USA
*/

#define BITLBEE_CORE
#include "bitlbee.h"

user_t *user_add( irc_t *irc, char *nick )
{
        user_t *u, *lu = NULL;
        char *key;
        
        if( !nick_ok( nick ) )
                return( NULL );
        
        if( user_find( irc, nick ) != NULL )
                return( NULL );
        
        if( ( u = irc->users ) )
        {
                while( u )
                {
                        if( nick_cmp( nick, u->nick ) < 0 )
                                break;
                        
                        lu = u;
                        u = u->next;
                }
                
                u = g_new0( user_t, 1 );
                if( lu )
                {
                        u->next = lu->next;
                        lu->next = u;
                }
                else
                {
                        u->next = irc->users;
                        irc->users = u;
                }
        }
        else
        {
                irc->users = u = g_new0( user_t, 1 );
        }
        
        u->user = u->realname = u->host = u->nick = g_strdup( nick );
        u->is_private = set_getbool( &irc->set, "private" );
        
        key = g_strdup( nick );
        nick_lc( key );
        g_hash_table_insert( irc->userhash, key, u );
        
        return( u );
}

int user_del( irc_t *irc, char *nick )
{
        user_t *u, *t;
        char *key;
        gpointer okey, ovalue;
        
        if( !nick_ok( nick ) )
                return( 0 );
        
        u = irc->users;
        t = NULL;
        while( u )
        {
                if( nick_cmp( u->nick, nick ) == 0 )
                {
                        /* Get this key now already, since "nick" might be free()d
                           at the time we start playing with the hash... */
                        key = g_strdup( nick );
                        nick_lc( key );
                        
                        if( t )
                                t->next = u->next;
                        else
                                irc->users = u->next;
                        if( u->online )
                                irc_kill( irc, u );
                        g_free( u->nick );
                        if( u->nick != u->user ) g_free( u->user );
                        if( u->nick != u->host ) g_free( u->host );
                        if( u->nick != u->realname ) g_free( u->realname );
                        g_free( u->group );
                        g_free( u->away );
                        g_free( u->handle );
                        g_free( u->sendbuf );
                        if( u->sendbuf_timer ) b_event_remove( u->sendbuf_timer );
                        g_free( u );
                        
                        if( !g_hash_table_lookup_extended( irc->userhash, key, &okey, &ovalue ) || ovalue != u )
                        {
                                g_free( key );
                                return( 1 );    /* Although this is a severe error, the user is removed from the list... */
                        }
                        g_hash_table_remove( irc->userhash, key );
                        g_free( key );
                        g_free( okey );
                        
                        return( 1 );
                }
                u = (t=u)->next;
        }
        
        return( 0 );
}

user_t *user_find( irc_t *irc, char *nick )
{
        char key[512] = "";
        
        strncpy( key, nick, sizeof( key ) - 1 );
        if( nick_lc( key ) )
                return( g_hash_table_lookup( irc->userhash, key ) );
        else
                return( NULL );
}

user_t *user_findhandle( struct im_connection *ic, char *handle )
{
        user_t *u;
        char *nick;
        
        /* First, let's try a hash lookup. If it works, it's probably faster. */
        if( ( nick = g_hash_table_lookup( ic->acc->nicks, handle ) ) &&
            ( u = user_find( ic->irc, nick ) ) &&
            ( ic->acc->prpl->handle_cmp( handle, u->handle ) == 0 ) )
                return u;
        
        /* However, it doesn't always work, so in that case we'll have to dig
           through the whole userlist. :-( */
        for( u = ic->irc->users; u; u = u->next )
                if( u->ic == ic && u->handle && ic->acc->prpl->handle_cmp( u->handle, handle ) == 0 )
                        return u;
        
        return NULL;
}

/* DO NOT PASS u->nick FOR oldnick !!! */
void user_rename( irc_t *irc, char *oldnick, char *newnick )
{
        user_t *u = user_find( irc, oldnick );
        gpointer okey, ovalue;
        char *key;
        
        if( !u ) return;        /* Should've been checked by the caller... */
        
        g_free( u->nick );
        if( u->nick == u->user ) u->user = NULL;
        if( u->nick == u->host ) u->host = NULL;
        if( u->nick == u->realname ) u->realname = NULL;
        u->nick = g_strdup( newnick );
        if( !u->user ) u->user = u->nick;
        if( !u->host ) u->host = u->nick;
        if( !u->realname ) u->realname = u->nick;
        
        /* Remove the old reference to this user from the hash and create a
           new one with the new nick. This is indeed a bit messy. */
        key = g_strdup( oldnick );
        nick_lc( key );
        if( !g_hash_table_lookup_extended( irc->userhash, key, &okey, &ovalue ) || ovalue != u )
        {
                g_free( key );
                return;         /* This really shouldn't happen! */     
        }
        g_hash_table_remove( irc->userhash, key );
        g_free( key );
        g_free( okey );
        
        key = g_strdup( newnick );
        nick_lc( key );
        g_hash_table_insert( irc->userhash, key, u );
        
        /* Also, let's try to keep the linked list nicely sorted. Fear this
           code. If my teacher would see this, she would cry. ;-) */
        {
                user_t *u1, *lu1;
                
                /* Remove the user from the old position in the chain. */
                if( u == irc->users )
                {
                        irc->users = u->next;
                }
                else
                {
                        u1 = u;
                        for( lu1 = irc->users; lu1->next != u1; lu1 = lu1->next );
                        lu1->next = u1->next;
                }
                
                /* Search for the new position. */
                for( lu1 = NULL, u1 = irc->users; u1; u1 = u1->next )
                {
                        if( nick_cmp( newnick, u1->nick ) < 0 )
                                break;
                        
                        lu1 = u1;
                }
                
                /* Insert it at this new position. */
                u->next = u1;
                if( lu1 )
                        lu1->next = u;
                else
                        irc->users = u;
        }
}