* Copyright (c) 1992 The Regents of the University of California.
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid
[] = "@(#)fixunsdfdi.c 5.5 (Berkeley) 7/13/92";
#endif /* LIBC_SCCS and not lint */
#define ONE_FOURTH (1 << (LONG_BITS - 2))
#define ONE_HALF (ONE_FOURTH * 2.0)
#define ONE (ONE_FOURTH * 4.0)
* Convert double to (unsigned) quad.
* Not sure what to do with negative numbers---for now, anything out
* of range becomes UQUAD_MAX.
return (UQUAD_MAX
); /* ??? should be 0? ERANGE??? */
#ifdef notdef /* this falls afoul of a GCC bug */
#else /* so we wire in 2^64-1 instead */
if (x
>= 18446744073709551615.0)
* Get the upper part of the result. Note that the divide
* may round up; we want to avoid this if possible, so we
toppart
= (x
- ONE_HALF
) / ONE
;
* Now build a u_quad_t out of the top part. The difference
* between x and this is the bottom part (this may introduce
* a few fuzzy bits, but what the heck). With any luck this
* difference will be nonnegative: x should wind up in the
* range [0..ULONG_MAX]. For paranoia, we assume [LONG_MIN..
t
.ul
[H
] = (unsigned long)toppart
;