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/*
FUNCTION
<<ldiv>>---divide two long integers
INDEX
ldiv
ANSI_SYNOPSIS
#include <stdlib.h>
ldiv_t ldiv(long <[n]>, long <[d]>);
TRAD_SYNOPSIS
#include <stdlib.h>
ldiv_t ldiv(<[n]>, <[d]>)
long <[n]>, <[d]>;
DESCRIPTION
Divide
@tex
$n/d$,
@end tex
@ifinfo
<[n]>/<[d]>,
@end ifinfo
returning quotient and remainder as two long integers in a structure <<ldiv_t>>.
RETURNS
The result is represented with the structure
. typedef struct
. {
. long quot;
. long rem;
. } ldiv_t;
where the <<quot>> field represents the quotient, and <<rem>> the
remainder. For nonzero <[d]>, if `<<<[r]> = ldiv(<[n]>,<[d]>);>>' then
<[n]> equals `<<<[r]>.rem + <[d]>*<[r]>.quot>>'.
To divide <<int>> rather than <<long>> values, use the similar
function <<div>>.
PORTABILITY
<<ldiv>> is ANSI.
No supporting OS subroutines are required.
*/
/*
* Copyright (c) 1990 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* 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.
*/
#include <_ansi.h>
#include <stdlib.h> /* ldiv_t */
ldiv_t
_DEFUN (ldiv, (num, denom),
long num _AND
long denom)
{
ldiv_t r;
/* see div.c for comments */
r.quot = num / denom;
r.rem = num % denom;
if (num >= 0 && r.rem < 0) {
++r.quot;
r.rem -= denom;
}
else if (num < 0 && r.rem > 0) {
--r.quot;
r.rem += denom;
}
return (r);
}
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