Algorithms/frames.c


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#include <stdlib.h>

#include "frames.h"
#include "lists.h"

int alloc_frame(List *frames)
{

	int frame_number, *data;

	if (list_size(frames) == 0) {/* No frames available */
		return -1;

	} else {
		if (list_rem_next(frames, NULL, (void **)&data) != 0) {
			return -1;
		} else {
			frame_number = *data;
			free(data);
		}
	}

	return frame_number;
}

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

	if ((data = (int *)malloc(sizeof(int))) == NULL)
		return -1;

	*data = frame_number;

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

	return 0;
}