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/*

 * ====================================================

 * 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

        <>, <>---arc sine

   asin

INDEX

   asinf

        #include 

        double asin(double <[x]>);

        float asinf(float <[x]>);

        #include 

        double asin(<[x]>)

        double <[x]>;

        float <[x]>;

Arguments to <> must be in the range @minus{}1 to 1.

returning floats.

@ifnottex

<> returns values in radians, in the range of -pi/2 to pi/2.

@end ifnottex

@tex

<> returns values in radians, in the range of $-\pi/2$ to $\pi/2$.

@end tex

return NaN (not a number), set the global variable <> to

<>, and issue a <> message.

 asin	 y,y,y,m

 asinf   n,n,n,m

 asin,  -1<=arg<=1, asin(arg),,,

 asin,  NAN,  arg,EDOM, DOMAIN

 asinf,  -1<=arg<=1, asin(arg),,,

 asinf,  NAN,  arg,EDOM, DOMAIN

 * wrapper asin(x)

 */

#include 

	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 = nan("");

	    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

}