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-rw-r--r--sysdeps/generic/fmod.c155
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diff --git a/sysdeps/generic/fmod.c b/sysdeps/generic/fmod.c
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-/*
- * Copyright (c) 1989, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *	This product includes software developed by the University of
- *	California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#ifndef lint
-static char sccsid[] = "@(#)fmod.c	8.1 (Berkeley) 6/4/93";
-#endif /* not lint */
-
-/* fmod.c
- *
- * SYNOPSIS
- *
- *    #include <math.h>
- *    double fmod(double x, double y)
- *
- * DESCRIPTION
- *
- *    The fmod function computes the floating-point remainder of x/y.
- *
- * RETURNS
- *
- *    The fmod function returns the value x-i*y, for some integer i
- * such that, if y is nonzero, the result has the same sign as x and
- * magnitude less than the magnitude of y.
- *
- * On a VAX or CCI,
- *
- *    fmod(x,0) traps/faults on floating-point divided-by-zero.
- *
- * On IEEE-754 conforming machines with "isnan()" primitive,
- *
- *    fmod(x,0), fmod(INF,y) are invalid operations and NaN is returned.
- *
- */
-#if !defined(vax) && !defined(tahoe)
-extern int isnan(),finite();
-#endif	/* !defined(vax) && !defined(tahoe) */
-extern double frexp(),ldexp(),fabs();
-
-#ifdef TEST_FMOD
-static double
-_fmod(x,y)
-#else	/* TEST_FMOD */
-double
-fmod(x,y)
-#endif	/* TEST_FMOD */
-double x,y;
-{
-	int ir,iy;
-	double r,w;
-
-	if (y == (double)0
-#if !defined(vax) && !defined(tahoe)	/* per "fmod" manual entry, SunOS 4.0 */
-		|| isnan(y) || !finite(x)
-#endif	/* !defined(vax) && !defined(tahoe) */
-	    )
-	    return (x*y)/(x*y);
-
-	r = fabs(x);
-	y = fabs(y);
-	(void)frexp(y,&iy);
-	while (r >= y) {
-		(void)frexp(r,&ir);
-		w = ldexp(y,ir-iy);
-		r -= w <= r ? w : w*(double)0.5;
-	}
-	return x >= (double)0 ? r : -r;
-}
-
-#ifdef TEST_FMOD
-extern long random();
-extern double fmod();
-
-#define	NTEST	10000
-#define	NCASES	3
-
-static int nfail = 0;
-
-static void
-doit(x,y)
-double x,y;
-{
-	double ro = fmod(x,y),rn = _fmod(x,y);
-	if (ro != rn) {
-		(void)printf(" x    = 0x%08.8x %08.8x (%24.16e)\n",x,x);
-		(void)printf(" y    = 0x%08.8x %08.8x (%24.16e)\n",y,y);
-		(void)printf(" fmod = 0x%08.8x %08.8x (%24.16e)\n",ro,ro);
-		(void)printf("_fmod = 0x%08.8x %08.8x (%24.16e)\n",rn,rn);
-		(void)printf("\n");
-	}
-}
-
-main()
-{
-	register int i,cases;
-	double x,y;
-
-	srandom(12345);
-	for (i = 0; i < NTEST; i++) {
-		x = (double)random();
-		y = (double)random();
-		for (cases = 0; cases < NCASES; cases++) {
-			switch (cases) {
-			case 0:
-				break;
-			case 1:
-				y = (double)1/y; break;
-			case 2:
-				x = (double)1/x; break;
-			default:
-				abort(); break;
-			}
-			doit(x,y);
-			doit(x,-y);
-			doit(-x,y);
-			doit(-x,-y);
-		}
-	}
-	if (nfail)
-		(void)printf("Number of failures: %d (out of a total of %d)\n",
-			nfail,NTEST*NCASES*4);
-	else
-		(void)printf("No discrepancies were found\n");
-	exit(0);
-}
-#endif	/* TEST_FMOD */