Subversion Repositories openrisc_2011-10-31

/*

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

@ifnottex

<[n]>/<[d]>,

@end ifnottex

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);

}