/* 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 (bc_num num1, bc_num num2, bc_num *quot, bc_num *rem, int scale TSRMLS_DC) { bc_num quotient = NULL; bc_num temp; int rscale; /* Check for correct numbers. */ if (bc_is_zero (num2 TSRMLS_CC)) return -1; /* Calculate final scale. */ rscale = MAX (num1->n_scale, num2->n_scale+scale); bc_init_num(&temp TSRMLS_CC); /* Calculate it. */ bc_divide (num1, num2, &temp, scale TSRMLS_CC); if (quot) quotient = bc_copy_num (temp); bc_multiply (temp, num2, &temp, rscale TSRMLS_CC); 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 (bc_num num1, bc_num num2, bc_num *result, int scale TSRMLS_DC) { return bc_divmod (num1, num2, NULL, result, scale TSRMLS_CC); }