Annotation of embedaddon/php/ext/bcmath/libbcmath/src/num2long.c, revision 1.1.1.1
1.1 misho 1: /* num2long.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: /* Convert a number NUM to a long. The function returns only the integer
42: part of the number. For numbers that are too large to represent as
43: a long, this function returns a zero. This can be detected by checking
44: the NUM for zero after having a zero returned. */
45:
46: long
47: bc_num2long (num)
48: bc_num num;
49: {
50: long val;
51: char *nptr;
52: int index;
53:
54: /* Extract the int value, ignore the fraction. */
55: val = 0;
56: nptr = num->n_value;
57: for (index=num->n_len; (index>0) && (val<=(LONG_MAX/BASE)); index--)
58: val = val*BASE + *nptr++;
59:
60: /* Check for overflow. If overflow, return zero. */
61: if (index>0) val = 0;
62: if (val < 0) val = 0;
63:
64: /* Return the value. */
65: if (num->n_sign == PLUS)
66: return (val);
67: else
68: return (-val);
69: }
70:
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