1 /* zero.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. (LICENSE)
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 <stdlib.h>
35 #include <ctype.h>
36 #include <stdarg.h>
37 #include "bcmath.h"
38 #include "private.h"
39
40 /* In some places we need to check if the number NUM is zero. */
41
42 char
bc_is_zero_for_scale(bc_num num,int scale)43 bc_is_zero_for_scale (bc_num num, int scale)
44 {
45 int count;
46 char *nptr;
47
48 /* Quick check. */
49 if (num == BCG(_zero_)) return TRUE;
50
51 /* Initialize */
52 count = num->n_len + scale;
53 nptr = num->n_value;
54
55 /* The check */
56 while ((count > 0) && (*nptr++ == 0)) count--;
57
58 if (count != 0)
59 return FALSE;
60 else
61 return TRUE;
62 }
63
64 char
bc_is_zero(bc_num num)65 bc_is_zero (bc_num num)
66 {
67 return bc_is_zero_for_scale(num, num->n_scale);
68 }
69
