gstreamer/gst/gstfilter.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:gstfilter
* @short_description: A utility function to filter GLists.
*
*/
#include "gst_private.h"
#include <gst/gstfilter.h>
/**
* gst_filter_run:
* @list: a linked list
* @func: the function to execute for each item
* @first: flag to stop execution after a successful item
* @user_data: user data
*
* Iterates over the elements in @list, calling @func with the
* list item data for each item. If @func returns TRUE, @data is
* prepended to the list of results returned. If @first is true,
* the search is halted after the first result is found.
*
* Returns: the list of results
*/
GList *
gst_filter_run (const GList * list, GstFilterFunc func, gboolean first,
gpointer user_data)
{
const GList *walk = list;
GList *result = NULL;
while (walk) {
gboolean res = TRUE;
gpointer data = walk->data;
walk = g_list_next (walk);
if (func)
res = func (data, user_data);
if (res) {
result = g_list_prepend (result, data);
if (first)
break;
}
}
return result;
}