import newlib-2000-02-17 snapshot

1 files changed, 121 insertions, 0 deletions

diff --git a/newlib/libm/math/w_asin.c b/newlib/libm/math/w_asin.c
new file mode 100644
index 000000000..f6cb271d3
--- /dev/null
+++ b/newlib/libm/math/w_asin.c
@@ -0,0 +1,121 @@
+
+/* @(#)w_asin.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
+        <<asin>>, <<asinf>>---arc sine
+
+INDEX
+   asin
+INDEX
+   asinf
+
+ANSI_SYNOPSIS
+        #include <math.h>
+        double asin(double <[x]>);
+        float asinf(float <[x]>);
+
+TRAD_SYNOPSIS
+        #include <math.h>
+        double asin(<[x]>)
+        double <[x]>;
+
+        float asinf(<[x]>)
+        float <[x]>;
+
+
+DESCRIPTION
+
+<<asin>> computes the inverse sine (arc sine) of the argument <[x]>.
+Arguments to <<asin>> must be in the range @minus{}1 to 1.
+
+<<asinf>> is identical to <<asin>>, other than taking and
+returning floats.
+
+You can modify error handling for these routines using <<matherr>>. 
+
+RETURNS
+@ifinfo
+<<asin>> returns values in radians, in the range of -pi/2 to pi/2.
+@end ifinfo
+@tex
+<<asin>> returns values in radians, in the range of $-\pi/2$ to $\pi/2$.
+@end tex
+
+If <[x]> is not in the range @minus{}1 to 1, <<asin>> and <<asinf>>
+return NaN (not a number), set the global variable <<errno>> to
+<<EDOM>>, and issue a <<DOMAIN error>> message.
+
+You can change this error treatment using <<matherr>>.
+
+QUICKREF ANSI SVID POSIX RENTRANT
+ asin	 y,y,y,m
+ asinf   n,n,n,m
+
+MATHREF  
+ asin,  -1<=arg<=1, asin(arg),,,
+ asin,  NAN,  arg,EDOM, DOMAIN
+
+MATHREF  
+ asinf,  -1<=arg<=1, asin(arg),,,
+ asinf,  NAN,  arg,EDOM, DOMAIN 
+
+
+*/
+
+/* 
+ * wrapper asin(x)
+ */
+
+
+#include "fdlibm.h"
+#include <errno.h>
+
+#ifndef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double asin(double x)		/* wrapper asin */
+#else
+	double asin(x)			/* wrapper asin */
+	double x;
+#endif
+{
+#ifdef _IEEE_LIBM
+	return __ieee754_asin(x);
+#else
+	double z;
+	struct exception exc;
+	z = __ieee754_asin(x);
+	if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
+	if(fabs(x)>1.0) {
+	    /* asin(|x|>1) */
+	    exc.type = DOMAIN;
+	    exc.name = "asin";
+	    exc.err = 0;
+	    exc.arg1 = exc.arg2 = x;
+	    exc.retval = 0.0;
+	    if(_LIB_VERSION == _POSIX_)
+	      errno = EDOM;
+	    else if (!matherr(&exc)) {
+	      errno = EDOM;
+	    }
+	    if (exc.err != 0)
+	      errno = exc.err;
+	    return exc.retval; 
+	} else
+	    return z;
+#endif
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */