1 files changed, 48 insertions, 0 deletions
diff --git a/cyclone/sickle/atanh.c b/cyclone/sickle/atanh.c
new file mode 100644
index 0000000..464f955
--- /dev/null
+++ b/cyclone/sickle/atanh.c
@@ -0,0 +1,48 @@
+/* Copyright (c) 2002-2003 krzYszcz and others.
+ * For information on usage and redistribution, and for a DISCLAIMER OF ALL
+ * WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */
+
+#include <math.h>
+#include "m_pd.h"
+#include "sickle/sic.h"
+
+/* LATER ask about osx */
+#if defined(NT) || defined(MACOSX)
+#define atanhf(x)  (log((1 + x) / (1 - x)) * 0.5)
+#endif
+
+typedef t_sic t_atanh;
+static t_class *atanh_class;
+
+static t_int *atanh_perform(t_int *w)
+{
+    int nblock = (int)(w[1]);
+    t_float *in = (t_float *)(w[2]);
+    t_float *out = (t_float *)(w[3]);
+    while (nblock--)
+    {
+	float f = *in++;
+	*out++ = atanhf(f);  /* CHECKME no protection against NaNs */
+    }
+    return (w + 4);
+}
+
+static void atanh_dsp(t_atanh *x, t_signal **sp)
+{
+    dsp_add(atanh_perform, 3, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec);
+}
+
+static void *atanh_new(void)
+{
+    t_atanh *x = (t_atanh *)pd_new(atanh_class);
+    outlet_new((t_object *)x, &s_signal);
+    return (x);
+}
+
+void atanh_tilde_setup(void)
+{
+    atanh_class = class_new(gensym("atanh~"),
+			    (t_newmethod)atanh_new, 0,
+			    sizeof(t_atanh), 0, 0);
+    sic_setup(atanh_class, atanh_dsp, SIC_FLOATTOSIGNAL);
+}