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/**
* 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
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#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 *
fifo_create(void)
{
return (FIFO *) g_malloc(sizeof(FIFO), 1);
}
/**
* Delete specified FIFO
*****************************************************************************/
void
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
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 *
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
fifo_is_empty(FIFO *self)
{
if (!self)
return 1;
return (self->head == 0);
}
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