import newlib-2000-02-17 snapshot

1 files changed, 109 insertions, 0 deletions

diff --git a/newlib/libm/math/w_hypot.c b/newlib/libm/math/w_hypot.c
new file mode 100644
index 000000000..318853d56
--- /dev/null
+++ b/newlib/libm/math/w_hypot.c
@@ -0,0 +1,109 @@
+
+/* @(#)w_hypot.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.
+ * ====================================================
+ */
+
+/*
+FUNCTION
+	<<hypot>>, <<hypotf>>---distance from origin
+INDEX
+	hypot
+INDEX
+	hypotf
+
+ANSI_SYNOPSIS
+	#include <math.h>
+	double hypot(double <[x]>, double <[y]>);
+	float hypotf(float <[x]>, float <[y]>);
+
+TRAD_SYNOPSIS
+	double hypot(<[x]>, <[y]>)
+	double <[x]>, <[y]>;
+
+	float hypotf(<[x]>, <[y]>)
+	float <[x]>, <[y]>;
+
+DESCRIPTION
+	<<hypot>> calculates the Euclidean distance
+	@tex
+	$\sqrt{x^2+y^2}$
+	@end tex
+	@ifinfo
+	<<sqrt(<[x]>*<[x]> + <[y]>*<[y]>)>>
+	@end ifinfo
+	between the origin (0,0) and a point represented by the
+	Cartesian coordinates (<[x]>,<[y]>).  <<hypotf>> differs only
+	in the type of its arguments and result.
+
+RETURNS
+	Normally, the distance value is returned.  On overflow,
+	<<hypot>> returns <<HUGE_VAL>> and sets <<errno>> to
+	<<ERANGE>>.
+
+	You can change the error treatment with <<matherr>>.
+
+PORTABILITY
+	<<hypot>> and <<hypotf>> are not ANSI C.  */
+
+/*
+ * wrapper hypot(x,y)
+ */
+
+#include "fdlibm.h"
+#include <errno.h>
+
+#ifndef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double hypot(double x, double y)/* wrapper hypot */
+#else
+	double hypot(x,y)		/* wrapper hypot */
+	double x,y;
+#endif
+{
+#ifdef _IEEE_LIBM
+	return __ieee754_hypot(x,y);
+#else
+	double z;
+	struct exception exc;
+	z = __ieee754_hypot(x,y);
+	if(_LIB_VERSION == _IEEE_) return z;
+	if((!finite(z))&&finite(x)&&finite(y)) {
+	    /* hypot(finite,finite) overflow */
+#ifndef HUGE_VAL 
+#define HUGE_VAL inf
+	    double inf = 0.0;
+
+	    SET_HIGH_WORD(inf,0x7ff00000);	/* set inf to infinite */
+#endif
+	    exc.type = OVERFLOW;
+	    exc.name = "hypot";
+	    exc.err = 0;
+	    exc.arg1 = x;
+	    exc.arg2 = y;
+	    if (_LIB_VERSION == _SVID_)
+	       exc.retval = HUGE;
+	    else
+	       exc.retval = HUGE_VAL;
+	    if (_LIB_VERSION == _POSIX_)
+	       errno = ERANGE;
+	    else if (!matherr(&exc)) {
+	     	errno = ERANGE;
+	    }
+	    if (exc.err != 0)
+	       errno = exc.err;
+            return exc.retval; 
+	} else
+	    return z;
+#endif
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */