1570af302Sopenharmony_ci/* origin: FreeBSD /usr/src/lib/msun/src/e_scalbf.c */ 2570af302Sopenharmony_ci/* 3570af302Sopenharmony_ci * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 4570af302Sopenharmony_ci */ 5570af302Sopenharmony_ci/* 6570af302Sopenharmony_ci * ==================================================== 7570af302Sopenharmony_ci * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 8570af302Sopenharmony_ci * 9570af302Sopenharmony_ci * Developed at SunPro, a Sun Microsystems, Inc. business. 10570af302Sopenharmony_ci * Permission to use, copy, modify, and distribute this 11570af302Sopenharmony_ci * software is freely granted, provided that this notice 12570af302Sopenharmony_ci * is preserved. 13570af302Sopenharmony_ci * ==================================================== 14570af302Sopenharmony_ci */ 15570af302Sopenharmony_ci 16570af302Sopenharmony_ci#define _GNU_SOURCE 17570af302Sopenharmony_ci#include <math.h> 18570af302Sopenharmony_ci 19570af302Sopenharmony_cifloat scalbf(float x, float fn) 20570af302Sopenharmony_ci{ 21570af302Sopenharmony_ci if (isnan(x) || isnan(fn)) return x*fn; 22570af302Sopenharmony_ci if (!isfinite(fn)) { 23570af302Sopenharmony_ci if (fn > 0.0f) 24570af302Sopenharmony_ci return x*fn; 25570af302Sopenharmony_ci else 26570af302Sopenharmony_ci return x/(-fn); 27570af302Sopenharmony_ci } 28570af302Sopenharmony_ci if (rintf(fn) != fn) return (fn-fn)/(fn-fn); 29570af302Sopenharmony_ci if ( fn > 65000.0f) return scalbnf(x, 65000); 30570af302Sopenharmony_ci if (-fn > 65000.0f) return scalbnf(x,-65000); 31570af302Sopenharmony_ci return scalbnf(x,(int)fn); 32570af302Sopenharmony_ci} 33