Annotation of embedaddon/php/ext/bcmath/libbcmath/src/divmod.c, revision 1.1.1.1
1.1 misho 1: /* divmod.c: bcmath library file. */
2: /*
3: Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
4: Copyright (C) 2000 Philip A. Nelson
5:
6: This library is free software; you can redistribute it and/or
7: modify it under the terms of the GNU Lesser General Public
8: License as published by the Free Software Foundation; either
9: version 2 of the License, or (at your option) any later version.
10:
11: This library is distributed in the hope that it will be useful,
12: but WITHOUT ANY WARRANTY; without even the implied warranty of
13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: Lesser General Public License for more details. (COPYING.LIB)
15:
16: You should have received a copy of the GNU Lesser General Public
17: License along with this library; if not, write to:
18:
19: The Free Software Foundation, Inc.
20: 59 Temple Place, Suite 330
21: Boston, MA 02111-1307 USA.
22:
23: You may contact the author by:
24: e-mail: philnelson@acm.org
25: us-mail: Philip A. Nelson
26: Computer Science Department, 9062
27: Western Washington University
28: Bellingham, WA 98226-9062
29:
30: *************************************************************************/
31:
32: #include <config.h>
33: #include <stdio.h>
34: #include <assert.h>
35: #include <stdlib.h>
36: #include <ctype.h>
37: #include <stdarg.h>
38: #include "bcmath.h"
39: #include "private.h"
40:
41:
42: /* Division *and* modulo for numbers. This computes both NUM1 / NUM2 and
43: NUM1 % NUM2 and puts the results in QUOT and REM, except that if QUOT
44: is NULL then that store will be omitted.
45: */
46:
47: int
48: bc_divmod (bc_num num1, bc_num num2, bc_num *quot, bc_num *rem, int scale TSRMLS_DC)
49: {
50: bc_num quotient = NULL;
51: bc_num temp;
52: int rscale;
53:
54: /* Check for correct numbers. */
55: if (bc_is_zero (num2 TSRMLS_CC)) return -1;
56:
57: /* Calculate final scale. */
58: rscale = MAX (num1->n_scale, num2->n_scale+scale);
59: bc_init_num(&temp TSRMLS_CC);
60:
61: /* Calculate it. */
62: bc_divide (num1, num2, &temp, scale TSRMLS_CC);
63: if (quot)
64: quotient = bc_copy_num (temp);
65: bc_multiply (temp, num2, &temp, rscale TSRMLS_CC);
66: bc_sub (num1, temp, rem, rscale);
67: bc_free_num (&temp);
68:
69: if (quot)
70: {
71: bc_free_num (quot);
72: *quot = quotient;
73: }
74:
75: return 0; /* Everything is OK. */
76: }
77:
78:
79: /* Modulo for numbers. This computes NUM1 % NUM2 and puts the
80: result in RESULT. */
81:
82: int
83: bc_modulo (bc_num num1, bc_num num2, bc_num *result, int scale TSRMLS_DC)
84: {
85: return bc_divmod (num1, num2, NULL, result, scale TSRMLS_CC);
86: }
87:
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