import newlib-2000-02-17 snapshot

1 files changed, 116 insertions, 0 deletions

diff --git a/newlib/libm/math/w_cosh.c b/newlib/libm/math/w_cosh.c
new file mode 100644
index 000000000..7b38dcb08
--- /dev/null
+++ b/newlib/libm/math/w_cosh.c
@@ -0,0 +1,116 @@
+
+/* @(#)w_cosh.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
+        <<cosh>>, <<coshf>>---hyperbolic cosine
+
+ANSI_SYNOPSIS
+        #include <math.h>
+        double cosh(double <[x]>);
+        float coshf(float <[x]>)
+
+TRAD_SYNOPSIS
+        #include <math.h>
+        double cosh(<[x]>)
+        double <[x]>;
+
+        float coshf(<[x]>)
+        float <[x]>;
+
+DESCRIPTION
+
+	<<cosh>> computes the hyperbolic cosine of the argument <[x]>.
+	<<cosh(<[x]>)>> is defined as 
+	@ifinfo
+	. (exp(x) + exp(-x))/2
+	@end ifinfo
+	@tex
+	$${(e^x + e^{-x})} \over 2$$
+	@end tex
+
+	Angles are specified in radians.  
+		
+	<<coshf>> is identical, save that it takes and returns <<float>>.
+
+RETURNS
+	The computed value is returned.  When the correct value would create
+	an overflow,  <<cosh>> returns the value <<HUGE_VAL>> with the
+	appropriate sign, and the global value <<errno>> is set to <<ERANGE>>.
+
+	You can modify error handling for these functions using the
+	function <<matherr>>.
+
+PORTABILITY
+	<<cosh>> is ANSI.  
+	<<coshf>> is an extension.
+
+QUICKREF
+	cosh ansi pure
+	coshf - pure
+*/
+
+/* 
+ * wrapper cosh(x)
+ */
+
+#include "fdlibm.h"
+#include <errno.h>
+
+#ifndef _DOUBLE_IS_32BITS
+ 
+#ifdef __STDC__
+	double cosh(double x)		/* wrapper cosh */
+#else
+	double cosh(x)			/* wrapper cosh */
+	double x;
+#endif
+{
+#ifdef _IEEE_LIBM
+	return __ieee754_cosh(x);
+#else
+	double z;
+	struct exception exc;
+	z = __ieee754_cosh(x);
+	if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
+	if(fabs(x)>7.10475860073943863426e+02) {	
+	    /* cosh(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 = "cosh";
+	    exc.err = 0;
+	    exc.arg1 = exc.arg2 = x;
+	    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) */