transmission/libtransmission/list.c

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/*
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* This file Copyright (C) 2007-2008 Charles Kerr <charles@transmissionbt.com>
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
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*
* $Id$
*/
#include "transmission.h"
#include "list.h"
#include "utils.h"
static tr_list*
node_alloc( void )
{
return tr_new0( tr_list, 1 );
}
static void
node_free( tr_list* node )
{
tr_free( node );
}
/***
****
***/
void
tr_list_free( tr_list** list,
TrListForeachFunc data_free_func )
{
while( *list )
{
tr_list *node = *list;
*list = ( *list )->next;
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if( data_free_func )
data_free_func( node->data );
node_free( node );
}
}
void
tr_list_prepend( tr_list ** list,
void * data )
{
tr_list * node = node_alloc ( );
node->data = data;
node->next = *list;
if( *list )
( *list )->prev = node;
*list = node;
}
void
tr_list_append( tr_list ** list,
void * data )
{
tr_list * node = node_alloc( );
node->data = data;
if( !*list )
*list = node;
else
{
tr_list * l = *list;
while( l->next )
l = l->next;
l->next = node;
node->prev = l;
}
}
static tr_list*
tr_list_find_data( tr_list * list,
const void * data )
{
for( ; list; list = list->next )
if( list->data == data )
return list;
return NULL;
}
static void*
tr_list_remove_node( tr_list ** list,
tr_list * node )
{
void * data;
tr_list * prev = node ? node->prev : NULL;
tr_list * next = node ? node->next : NULL;
if( prev ) prev->next = next;
if( next ) next->prev = prev;
if( *list == node ) *list = next;
data = node ? node->data : NULL;
node_free( node );
return data;
}
void*
tr_list_pop_front( tr_list ** list )
{
void * ret = NULL;
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if( *list )
{
ret = ( *list )->data;
tr_list_remove_node( list, *list );
}
return ret;
}
void*
tr_list_remove_data( tr_list ** list,
const void * data )
{
return tr_list_remove_node( list, tr_list_find_data( *list, data ) );
}
void*
tr_list_remove( tr_list ** list,
const void * b,
TrListCompareFunc compare_func )
{
return tr_list_remove_node( list, tr_list_find( *list, b, compare_func ) );
}
tr_list*
tr_list_find( tr_list * list,
const void * b,
TrListCompareFunc func )
{
for( ; list; list = list->next )
if( !func( list->data, b ) )
return list;
return NULL;
}
int
tr_list_size( const tr_list * list )
{
int size = 0;
while( list )
{
++size;
list = list->next;
}
return size;
}
/*
* Double-linked list with easy memory management and fast
* insert/remove operations
*/
void
__tr_list_init( struct __tr_list * head )
{
head->next = head;
head->prev = head;
}
void
__tr_list_insert( struct __tr_list * list,
struct __tr_list * prev,
struct __tr_list * next)
{
next->prev = list;
list->next = next;
list->prev = prev;
prev->next = list;
}
void
__tr_list_splice( struct __tr_list * prev,
struct __tr_list * next)
{
next->prev = prev;
prev->next = next;
}
void
__tr_list_append( struct __tr_list * head,
struct __tr_list * list)
{
__tr_list_insert( list, head->prev, head );
}
void
__tr_list_remove( struct __tr_list * head )
{
__tr_list_splice( head->prev, head->next );
head->next = head->prev = NULL;
}
void
__tr_list_destroy( struct __tr_list * head,
__tr_list_free_t func)
{
while ( head->next != head )
{
struct __tr_list * list = head->next;
__tr_list_splice( list->prev, list->next );
func( list );
}
}