source: trunk/libs/newlib/src/newlib/libm/math/wf_sqrt.c @ 543

/* wf_sqrt.c -- float version of w_sqrt.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * 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 sqrtf(x)
 */

#include "fdlibm.h"
#include <errno.h>

#ifdef __STDC__
        float sqrtf(float x)            /* wrapper sqrtf */
#else
        float sqrtf(x)                  /* wrapper sqrtf */
        float x;
#endif
{
#ifdef _IEEE_LIBM
        return __ieee754_sqrtf(x);
#else
        float z;
        struct exception exc;
        z = __ieee754_sqrtf(x);
        if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
        if(x<(float)0.0) {
            /* sqrtf(negative) */
            exc.type = DOMAIN;
            exc.name = "sqrtf";
            exc.err = 0;
            exc.arg1 = exc.arg2 = (double)x;
            if (_LIB_VERSION == _SVID_)
              exc.retval = 0.0;
            else
              exc.retval = 0.0/0.0;
            if (_LIB_VERSION == _POSIX_) 
              errno = EDOM;
            else if (!matherr(&exc)) {
              errno = EDOM;
            }
            if (exc.err != 0)
              errno = exc.err;
            return (float)exc.retval; 
        } else
            return z;
#endif
}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__
        double sqrt(double x)
#else
        double sqrt(x)
        double x;
#endif
{
        return (double) sqrtf((float) x);
}

#endif /* defined(_DOUBLE_IS_32BITS) */