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/* ---------------------------- lifo ------------------------------------------ */
/* */
/* lifo buffer of floats, empties itselfe on every bang (in order of coming in) */
/* Written by Olaf Matthes (olaf.matthes@gmx.de) */
/* Get source at http://www.akustische-kunst.org/puredata/maxlib/ */
/* */
/* This program 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 2 */
/* of the License, or (at your option) any later version. */
/* */
/* This program 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 this program; if not, write to the Free Software */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* */
/* Based on PureData by Miller Puckette and others. */
/* */
/* Fifi-code based St. Rainstick fifi.c for Max, */
/* copyright St. Rainstick, Amsterdam 1995 */
/* */
/* ---------------------------------------------------------------------------- */
#include "m_pd.h"
static char *version = "lifo v0.1, written by Olaf Matthes <olaf.matthes@gmx.de>";
typedef struct lifo
{
t_object d_ob;
t_float *getal;
t_int count, end, size, teller;
t_outlet *out;
}t_lifo;
static t_class *lifo_class;
static void lifo_int(t_lifo *x, t_floatarg n)
{
x->getal[x->count] = n;
x->end = x->count;
if (x->teller < x->size) x->teller++;
x->count = (x->count + 1) % x->size;
}
static void lifo_bang(t_lifo *x)
{
if (x->teller > 0){
outlet_float(x->out,x->getal[x->end]);
x->teller--;
x->end = (x->end + x->size - 1) % x->size;
}
}
static void lifo_clear(t_lifo *x)
{
x->teller = 0;
}
static void lifo_free(t_lifo *x)
{
freebytes(x->getal, x->size * sizeof(t_float));
}
static void *lifo_new(t_floatarg n)
{
t_lifo *x = (t_lifo *)pd_new(lifo_class);
if (n<10) n = 10;
x->size = (t_int)n;
x->teller = 0;
x->end = 0;
x->count = 0;
x->getal = (t_float *)getbytes(x->size * sizeof(t_float));
x->out = outlet_new(&x->d_ob, gensym("float"));
#ifndef MAXLIB
post(version);
#endif
return (x);
}
void lifo_setup(void)
{
lifo_class = class_new(gensym("lifo"), (t_newmethod)lifo_new,
(t_method)lifo_free, sizeof(t_lifo), 0, A_DEFFLOAT, 0);
class_addfloat(lifo_class, lifo_int);
class_addbang(lifo_class, lifo_bang);
class_addmethod(lifo_class, (t_method)lifo_clear, gensym("clear"), 0);
class_sethelpsymbol(lifo_class, gensym("maxlib/help-lifo.pd"));
}
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