/* @(#)w_fmod.c 5.1 93/09/24 */ /* * ==================================================== * 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 <>, <>---floating-point remainder (modulo) INDEX fmod INDEX fmodf ANSI_SYNOPSIS #include double fmod(double <[x]>, double <[y]>) float fmodf(float <[x]>, float <[y]>) TRAD_SYNOPSIS #include double fmod(<[x]>, <[y]>) double (<[x]>, <[y]>); float fmodf(<[x]>, <[y]>) float (<[x]>, <[y]>); DESCRIPTION The <> and <> functions compute the floating-point remainder of <[x]>/<[y]> (<[x]> modulo <[y]>). RETURNS The <> function returns the value @ifinfo <[x]>-<[i]>*<[y]>, @end ifinfo @tex $x-i\times y$, @end tex for the largest integer <[i]> such that, if <[y]> is nonzero, the result has the same sign as <[x]> and magnitude less than the magnitude of <[y]>. <,0)>> returns NaN, and sets <> to <>. You can modify error treatment for these functions using <>. PORTABILITY <> is ANSI C. <> is an extension. */ /* * wrapper fmod(x,y) */ #include "fdlibm.h" #include #ifndef _DOUBLE_IS_32BITS #ifdef __STDC__ double fmod(double x, double y) /* wrapper fmod */ #else double fmod(x,y) /* wrapper fmod */ double x,y; #endif { #ifdef _IEEE_LIBM return __ieee754_fmod(x,y); #else double z; struct exception exc; z = __ieee754_fmod(x,y); if(_LIB_VERSION == _IEEE_ ||isnan(y)||isnan(x)) return z; if(y==0.0) { /* fmod(x,0) */ exc.type = DOMAIN; exc.name = "fmod"; exc.arg1 = x; exc.arg2 = y; exc.err = 0; if (_LIB_VERSION == _SVID_) exc.retval = x; 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 exc.retval; } else return z; #endif } #endif /* defined(_DOUBLE_IS_32BITS) */