1 /* w_scalbf.c -- float version of w_scalb.c. 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@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 #if defined(LIBM_SCCS) && !defined(lint) 17 static char rcsid[] = "$Id: w_scalbf.c,v 1.2 1994/09/22 16:46:04 jtc Exp $"; 18 #endif 19 20 /* 21 * wrapper scalbf(float x, float fn) is provide for 22 * passing various standard test suite. One 23 * should use scalbn() instead. 24 */ 25 26 #include "math.h" 27 #include "math_private.h" 28 29 #include <errno.h> 30 31 #ifdef __STDC__ 32 #ifdef _SCALB_INT 33 float scalbf(float x, int fn) /* wrapper scalbf */ 34 #else 35 float scalbf(float x, float fn) /* wrapper scalbf */ 36 #endif 37 #else 38 float scalbf(x,fn) /* wrapper scalbf */ 39 #ifdef _SCALB_INT 40 float x; int fn; 41 #else 42 float x,fn; 43 #endif 44 #endif 45 { 46 #ifdef _IEEE_LIBM 47 return __ieee754_scalbf(x,fn); 48 #else 49 float z; 50 z = __ieee754_scalbf(x,fn); 51 if(_LIB_VERSION == _IEEE_) return z; 52 if(!(finitef(z)||isnanf(z))&&finitef(x)) { 53 /* scalbf overflow */ 54 return (float)__kernel_standard((double)x,(double)fn,132); 55 } 56 if(z==(float)0.0&&z!=x) { 57 /* scalbf underflow */ 58 return (float)__kernel_standard((double)x,(double)fn,133); 59 } 60 #ifndef _SCALB_INT 61 if(!finitef(fn)) errno = ERANGE; 62 #endif 63 return z; 64 #endif 65 } 66