Data_Structure/frames.c at master · Snapcrafter/Data_Structure · GitHub

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#include <stdlib.h>

#include "frames.h"
#include "list.h"

/*
	alloc_frame
*/

int alloc_frame(List * frames)
{
	int frame_number;
	int * data;


	if (list_size(frames)  == 0)
	/*
		Return that there are no frames available.
	*/
		return -1;

	else
	{
		if ((list_rem_next(frames, NULL, (void **)&data)) != 0)
			/*
				Return that a frame could not be retrieved.
			*/
			return -1;
		else
		{
			/*
				Store the number of the available frame.
			*/
			frame_number = *data;
			free(data);
		}

	}

	return frame_number;
}

/*
	free_frame
*/
int free_frame(List * frames, int frame_number)
{
	int * data;

	/*
		Allocate storage for the frame number.
	*/
	if ((data = (int *)malloc(sizeof(int))) == NULL)
		return -1;

	/*
		Put the frame back in the list of available frames.
	*/
	*data = frame_number;

	if ((list_ins_next(frames, NULL, data)) != 0)
		return -1;

	return 0;
}