Annotation of embedaddon/php/ext/bcmath/libbcmath/src/nearzero.c, revision 1.1.1.1
1.1 misho 1: /* nearzero.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: /* In some places we need to check if the number NUM is almost zero.
42: Specifically, all but the last digit is 0 and the last digit is 1.
43: Last digit is defined by scale. */
44:
45: char
46: bc_is_near_zero (num, scale)
47: bc_num num;
48: int scale;
49: {
50: int count;
51: char *nptr;
52:
53: /* Error checking */
54: if (scale > num->n_scale)
55: scale = num->n_scale;
56:
57: /* Initialize */
58: count = num->n_len + scale;
59: nptr = num->n_value;
60:
61: /* The check */
62: while ((count > 0) && (*nptr++ == 0)) count--;
63:
64: if (count != 0 && (count != 1 || *--nptr != 1))
65: return FALSE;
66: else
67: return TRUE;
68: }
69:
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