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/* divmod.c: bcmath library file. */
/*
Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
Copyright (C) 2000 Philip A. Nelson
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details. (COPYING.LIB)
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to:
The Free Software Foundation, Inc.
59 Temple Place, Suite 330
Boston, MA 02111-1307 USA.
You may contact the author by:
e-mail: philnelson@acm.org
us-mail: Philip A. Nelson
Computer Science Department, 9062
Western Washington University
Bellingham, WA 98226-9062
*************************************************************************/
#include <config.h>
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <ctype.h>
#include <stdarg.h>
#include "bcmath.h"
#include "private.h"
/* Division *and* modulo for numbers. This computes both NUM1 / NUM2 and
NUM1 % NUM2 and puts the results in QUOT and REM, except that if QUOT
is NULL then that store will be omitted.
*/
int
bc_divmod (num1, num2, quot, rem, scale)
bc_num num1, num2, *quot, *rem;
int scale;
{
bc_num quotient = NULL;
bc_num temp;
int rscale;
/* Check for correct numbers. */
if (bc_is_zero (num2)) return -1;
/* Calculate final scale. */
rscale = MAX (num1->n_scale, num2->n_scale+scale);
bc_init_num(&temp);
/* Calculate it. */
bc_divide (num1, num2, &temp, scale);
if (quot)
quotient = bc_copy_num (temp);
bc_multiply (temp, num2, &temp, rscale);
bc_sub (num1, temp, rem, rscale);
bc_free_num (&temp);
if (quot)
{
bc_free_num (quot);
*quot = quotient;
}
return 0; /* Everything is OK. */
}
/* Modulo for numbers. This computes NUM1 % NUM2 and puts the
result in RESULT. */
int
bc_modulo (num1, num2, result, scale)
bc_num num1, num2, *result;
int scale;
{
return bc_divmod (num1, num2, NULL, result, scale);
}
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