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/*
* sydra
*
* sydra is a toolbox which allows you to set up multiple bidirectional
* Video/Audio streams from external locations.
* sydra has been written to be used for the Elevate Festival in Graz
* Austria in order to involve external locations to present themselves
* at the festival.
* Sydra is based on GStreamer and is written in C.
*
*
* Copyright (C) 2014 Christian Pointner <equinox@helsinki.at>
*
* This file is part of sydra.
*
* sydra 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 3 of the License, or
* any later version.
*
* sydra 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 sydra. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders hereby
* grant permission for non-GPL-compatible GStreamer plugins to be used
* and distributed together with GStreamer and sydra.
* This permission goes above and beyond the permissions granted by the
* GPL license sydra is covered by.
*/
#include <unistd.h>
#include <stdlib.h>
#include "datatypes.h"
#include "slist.h"
slist_element_t* slist_get_last(slist_element_t* first)
{
if(!first)
return NULL;
while(first->next_)
first = first->next_;
return first;
}
int slist_init(slist_t* lst, void (*delete_element)(void*))
{
if(!lst || !delete_element)
return -1;
lst->delete_element = delete_element;
lst->first_ = NULL;
return 0;
}
slist_element_t* slist_add(slist_t* lst, void* data)
{
if(!lst || !data)
return NULL;
slist_element_t* new_element = malloc(sizeof(slist_element_t));
if(!new_element)
return NULL;
new_element->data_ = data;
new_element->next_ = NULL;
if(!lst->first_)
lst->first_ = new_element;
else
slist_get_last(lst->first_)->next_ = new_element;
return new_element;
}
void slist_remove(slist_t* lst, void* data)
{
if(!lst || !lst->first_ || !data)
return;
slist_element_t* tmp = lst->first_->next_;
slist_element_t* prev = lst->first_;
if(lst->first_->data_ == data) {
lst->first_ = tmp;
lst->delete_element(prev->data_);
free(prev);
}
else {
while(tmp) {
if(tmp->data_ == data) {
prev->next_ = tmp->next_;
lst->delete_element(tmp->data_);
free(tmp);
return;
}
prev = tmp;
tmp = tmp->next_;
}
}
}
void slist_clear(slist_t* lst)
{
if(!lst || !lst->first_)
return;
do {
slist_element_t* deletee = lst->first_;
lst->first_ = lst->first_->next_;
lst->delete_element(deletee->data_);
free(deletee);
}
while(lst->first_);
lst->first_ = NULL;
}
int slist_length(slist_t* lst)
{
if(!lst || !lst->first_)
return 0;
int len = 0;
slist_element_t* tmp;
for(tmp = lst->first_; tmp; tmp = tmp->next_)
len++;
return len;
}
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