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-rw-r--r--newlib/libm/math/wr_gamma.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/newlib/libm/math/wr_gamma.c b/newlib/libm/math/wr_gamma.c
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+++ b/newlib/libm/math/wr_gamma.c
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+
+/* @(#)wr_gamma.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+/*
+ * wrapper double gamma_r(double x, int *signgamp)
+ */
+
+#include "fdlibm.h"
+#include <errno.h>
+
+#ifndef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+ double gamma_r(double x, int *signgamp) /* wrapper lgamma_r */
+#else
+ double gamma_r(x,signgamp) /* wrapper lgamma_r */
+ double x; int *signgamp;
+#endif
+{
+#ifdef _IEEE_LIBM
+ return __ieee754_gamma_r(x,signgamp);
+#else
+ double y;
+ struct exception exc;
+ y = __ieee754_gamma_r(x,signgamp);
+ if(_LIB_VERSION == _IEEE_) return y;
+ if(!finite(y)&&finite(x)) {
+#ifndef HUGE_VAL
+#define HUGE_VAL inf
+ double inf = 0.0;
+
+ SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */
+#endif
+ exc.name = "gamma";
+ exc.err = 0;
+ exc.arg1 = exc.arg2 = (double)x;
+ if (_LIB_VERSION == _SVID_)
+ exc.retval = HUGE;
+ else
+ exc.retval = HUGE_VAL;
+ if(floor(x)==x&&x<=0.0) {
+ /* gamma(-integer) or gamma(0) */
+ exc.type = SING;
+ if (_LIB_VERSION == _POSIX_)
+ errno = EDOM;
+ else if (!matherr(&exc)) {
+ errno = EDOM;
+ }
+ } else {
+ /* gamma(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 exc.retval;
+ } else
+ return y;
+#endif
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */