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authorLorry Tar Creator <lorry-tar-importer@baserock.org>2013-03-14 05:42:27 +0000
committer <>2013-04-03 16:25:08 +0000
commitc4dd7a1a684490673e25aaf4fabec5df138854c4 (patch)
tree4d57c44caae4480efff02b90b9be86f44bf25409 /ext/bcmath/libbcmath/src/divmod.c
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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 (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);
+}
+