add circuitpython code

1 files changed, 96 insertions, 0 deletions

diff --git a/circuitpython/lib/libm/wf_lgamma.c b/circuitpython/lib/libm/wf_lgamma.c
new file mode 100644
index 0000000..bcf3705
--- /dev/null
+++ b/circuitpython/lib/libm/wf_lgamma.c
@@ -0,0 +1,96 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * These math functions are taken from newlib-nano-2, the newlib/libm/math
+ * directory, available from https://github.com/32bitmicro/newlib-nano-2.
+ *
+ * Appropriate copyright headers are reproduced below.
+ */
+
+/* wf_lgamma.c -- float version of w_lgamma.c.
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
+ */
+
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ *
+ */
+
+#include "fdlibm.h"
+#define _IEEE_LIBM 1
+
+#ifdef __STDC__
+	float lgammaf(float x)
+#else
+	float lgammaf(x)
+	float x;
+#endif
+{
+#ifdef _IEEE_LIBM
+        int sign;
+	return __ieee754_lgammaf_r(x,&sign);
+#else
+        float y;
+	struct exception exc;
+        y = __ieee754_lgammaf_r(x,&(_REENT_SIGNGAM(_REENT)));
+        if(_LIB_VERSION == _IEEE_) return y;
+        if(!finitef(y)&&finitef(x)) {
+#ifndef HUGE_VAL
+#define HUGE_VAL inf
+	    double inf = 0.0;
+
+	    SET_HIGH_WORD(inf,0x7ff00000);	/* set inf to infinite */
+#endif
+	    exc.name = "lgammaf";
+	    exc.err = 0;
+	    exc.arg1 = exc.arg2 = (double)x;
+            if (_LIB_VERSION == _SVID_)
+               exc.retval = HUGE;
+            else
+               exc.retval = HUGE_VAL;
+	    if(floorf(x)==x&&x<=(float)0.0) {
+		/* lgammaf(-integer) */
+		exc.type = SING;
+		if (_LIB_VERSION == _POSIX_)
+		   errno = EDOM;
+		else if (!matherr(&exc)) {
+		   errno = EDOM;
+		}
+
+            } else {
+		/* lgammaf(finite) overflow */
+		exc.type = OVERFLOW;
+                if (_LIB_VERSION == _POSIX_)
+		   errno = ERANGE;
+                else if (!matherr(&exc)) {
+                   errno = ERANGE;
+		}
+            }
+	    if (exc.err != 0)
+	       errno = exc.err;
+            return (float)exc.retval;
+        } else
+            return y;
+#endif
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double lgamma(double x)
+#else
+	double lgamma(x)
+	double x;
+#endif
+{
+	return (double) lgammaf((float) x);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */