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e56ed6e1ab
Re-formats the BCmath extension to have consistent formatting. Mostly, it adds the spaces in calculations to have them more readable. Also: - removes unused headers - removes few variables which are used only once in the code Co-authored-by: George Peter Banyard <girgias@php.net>
65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/* num2long.c: bcmath library file. */
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/*
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Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
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Copyright (C) 2000 Philip A. Nelson
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details. (LICENSE)
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to:
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The Free Software Foundation, Inc.
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59 Temple Place, Suite 330
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Boston, MA 02111-1307 USA.
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You may contact the author by:
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e-mail: philnelson@acm.org
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us-mail: Philip A. Nelson
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Computer Science Department, 9062
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Western Washington University
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Bellingham, WA 98226-9062
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*************************************************************************/
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#include "bcmath.h"
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#include <stddef.h>
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/* Convert a number NUM to a long. The function returns only the integer
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part of the number. For numbers that are too large to represent as
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a long, this function returns a zero. This can be detected by checking
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the NUM for zero after having a zero returned. */
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long bc_num2long(bc_num num)
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{
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/* Extract the int value, ignore the fraction. */
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long val = 0;
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const char *nptr = num->n_value;
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for (size_t index = num->n_len; index > 0; index--) {
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char n = *nptr++;
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if (val > LONG_MAX / BASE) {
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return 0;
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}
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val *= BASE;
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if (val > LONG_MAX - n) {
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return 0;
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}
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val += n;
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}
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/* Return the value. */
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if (num->n_sign == PLUS) {
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return (val);
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} else {
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return (-val);
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}
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}
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