/*
 * history.c:
 *
 * Copyright (c) 2008 James McKenzie <james@fishsoup.dhs.org>,
 * All rights reserved.
 *
 */

static char rcsid[] = "$Id$";

/*
 * $Log$
 * Revision 1.2  2008/02/12 22:36:46  james
 * *** empty log message ***
 *
 * Revision 1.1  2008/02/08 15:06:42  james
 * *** empty log message ***
 *
 */

#include "project.h"

History *
history_new (int n)
{
  History *ret;

  ret = (History *) malloc (sizeof (History));
  ret->lines = malloc (n * sizeof (History_ent));
  memset (ret->lines, 0, n * sizeof (History_ent));

  ret->wptr = 0;
  ret->nlines = n;

  return ret;
}

void
history_free (History * h)
{
  if (!h)
    return;
  if (h->lines)
    free (h->lines);
  free (h);
}


void
history_add (History * h, CRT_CA * c)
{
  if (!h)
    return;

  memcpy (h->lines[h->wptr].line, c, sizeof (CRT_CA) * CRT_COLS);
  h->wptr++;

  if (h->wptr == h->nlines)
    h->wptr = 0;

}