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      1 /* w_scalbf.c -- float version of w_scalb.c.
      2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian (at) cygnus.com.
      3  */
      4 
      5 /*
      6  * ====================================================
      7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
      8  *
      9  * Developed at SunPro, a Sun Microsystems, Inc. business.
     10  * Permission to use, copy, modify, and distribute this
     11  * software is freely granted, provided that this notice
     12  * is preserved.
     13  * ====================================================
     14  */
     15 
     16 #include <sys/cdefs.h>
     17 #if defined(LIBM_SCCS) && !defined(lint)
     18 __RCSID("$NetBSD: w_scalbf.c,v 1.6 2002/05/26 22:02:02 wiz Exp $");
     19 #endif
     20 
     21 /*
     22  * wrapper scalbf(float x, float fn) is provide for
     23  * passing various standard test suite. One
     24  * should use scalbn() instead.
     25  */
     26 
     27 #include "math.h"
     28 #include "math_private.h"
     29 
     30 #include <errno.h>
     31 
     32 #ifdef _SCALB_INT
     33 float
     34 scalbf(float x, int fn)		/* wrapper scalbf */
     35 #else
     36 float
     37 scalbf(float x, float fn)		/* wrapper scalbf */
     38 #endif
     39 {
     40 #ifdef _IEEE_LIBM
     41 	return __ieee754_scalbf(x,fn);
     42 #else
     43 	float z;
     44 	z = __ieee754_scalbf(x,fn);
     45 	if(_LIB_VERSION == _IEEE_) return z;
     46 	if(!(finitef(z)||isnanf(z))&&finitef(x)) {
     47 	    /* scalbf overflow */
     48 	    return (float)__kernel_standard((double)x,(double)fn,132);
     49 	}
     50 	if(z==(float)0.0&&z!=x) {
     51 	    /* scalbf underflow */
     52 	    return (float)__kernel_standard((double)x,(double)fn,133);
     53 	}
     54 #ifndef _SCALB_INT
     55 	if(!finitef(fn)) errno = ERANGE;
     56 #endif
     57 	return z;
     58 #endif
     59 }
     60