You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
170 lines
3.6 KiB
170 lines
3.6 KiB
/**
|
|
* xrdp: A Remote Desktop Protocol server.
|
|
*
|
|
* Copyright (C) Laxmikant Rashinkar 2004-2014
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* FIFO implementation to store pointer to data struct
|
|
*/
|
|
|
|
#include "fifo.h"
|
|
#include "os_calls.h"
|
|
|
|
/**
|
|
* Create new fifo data struct
|
|
*
|
|
* @return pointer to new FIFO or NULL if system out of memory
|
|
*****************************************************************************/
|
|
|
|
FIFO * APP_CC
|
|
fifo_create(void)
|
|
{
|
|
return (FIFO *) g_malloc(sizeof(FIFO), 1);
|
|
}
|
|
|
|
/**
|
|
* Delete specified FIFO
|
|
*****************************************************************************/
|
|
|
|
void APP_CC
|
|
fifo_delete(FIFO *self)
|
|
{
|
|
USER_DATA *udp;
|
|
|
|
if (!self)
|
|
return;
|
|
|
|
if (!self->head)
|
|
{
|
|
/* FIFO is empty */
|
|
g_free(self);
|
|
return;
|
|
}
|
|
|
|
if (self->head == self->tail)
|
|
{
|
|
/* only one item in FIFO */
|
|
if (self->auto_free)
|
|
g_free(self->head->item);
|
|
|
|
g_free(self->head);
|
|
g_free(self);
|
|
return;
|
|
}
|
|
|
|
/* more then one item in FIFO */
|
|
while (self->head)
|
|
{
|
|
udp = self->head;
|
|
|
|
if (self->auto_free)
|
|
g_free(udp->item);
|
|
|
|
self->head = udp->next;
|
|
g_free(udp);
|
|
}
|
|
|
|
g_free(self);
|
|
}
|
|
|
|
/**
|
|
* Add an item to the specified FIFO
|
|
*
|
|
* @param self FIFO to operate on
|
|
* @param item item to add to specified FIFO
|
|
*
|
|
* @return 0 on success, -1 on error
|
|
*****************************************************************************/
|
|
|
|
int APP_CC
|
|
fifo_add_item(FIFO *self, void *item)
|
|
{
|
|
USER_DATA *udp;
|
|
|
|
if (!self || !item)
|
|
return -1;
|
|
|
|
if ((udp = (USER_DATA *) g_malloc(sizeof(USER_DATA), 0)) == 0)
|
|
return -1;
|
|
|
|
udp->item = item;
|
|
udp->next = 0;
|
|
|
|
/* if fifo is empty, add to head */
|
|
if (!self->head)
|
|
{
|
|
self->head = udp;
|
|
self->tail = udp;
|
|
return 0;
|
|
}
|
|
|
|
/* add to tail */
|
|
self->tail->next = udp;
|
|
self->tail = udp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Return an item from top of FIFO
|
|
*
|
|
* @param self FIFO to operate on
|
|
*
|
|
* @return top item from FIFO or NULL if FIFO is empty
|
|
*****************************************************************************/
|
|
|
|
void * APP_CC
|
|
fifo_remove_item(FIFO *self)
|
|
{
|
|
void *item;
|
|
USER_DATA *udp;
|
|
|
|
if (!self || !self->head)
|
|
return 0;
|
|
|
|
if (self->head == self->tail)
|
|
{
|
|
/* only one item in FIFO */
|
|
item = self->head->item;
|
|
g_free(self->head);
|
|
self->head = 0;
|
|
self->tail = 0;
|
|
return item;
|
|
}
|
|
|
|
/* more then one item in FIFO */
|
|
udp = self->head;
|
|
item = self->head->item;
|
|
self->head = self->head->next;
|
|
g_free(udp);
|
|
return item;
|
|
}
|
|
|
|
/**
|
|
* Return FIFO status
|
|
*
|
|
* @param self FIFO to operate on
|
|
*
|
|
* @return true if FIFO is empty, false otherwise
|
|
*****************************************************************************/
|
|
|
|
int APP_CC
|
|
fifo_is_empty(FIFO *self)
|
|
{
|
|
if (!self)
|
|
return 1;
|
|
|
|
return (self->head == 0);
|
|
}
|