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68247c02d5
* ext/bcmath: coding style: use indentation And add braces to block statements, as the current code was pretty much unreadable with how inconsistent it was. * ext/bcmath: Remove some useless header inclusions * ext/bcmath: Use standard C99 bool type instead of char * ext/bcmath: Include specific headers instead of config.h * Restructure definitions to reduce header inclusions * Use size_t as a more appropriate type * Remove unused variable full_scale * Refactor bc_raisemod() to get rid of Zend dependencies This separates the concerns of throwing exceptions back into the PHP_FUNCTION instead of being the responsibility of the library * Refactor bc_raise() to get rid of Zend dependencies This separates the concerns of throwing exceptions back into the PHP_FUNCTION instead of being the responsibility of the library * Refactor bc_divmod() and bc_modulo() to return bool Return false on division by 0 attempt instead of -1 and true on success instead of 0 * Refactor bc_divide() to return bool Return false on division by 0 attempt instead of -1 and true on success instead of 0
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* zero.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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#include <stdbool.h>
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/* In some places we need to check if the number NUM is zero. */
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bool bc_is_zero_for_scale (bc_num num, size_t scale)
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{
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size_t count;
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char *nptr;
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/* Quick check. */
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if (num == BCG(_zero_)) {
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return true;
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}
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/* Initialize */
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count = num->n_len + scale;
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nptr = num->n_value;
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/* The check */
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while ((count > 0) && (*nptr++ == 0)) count--;
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return count == 0;
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}
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bool bc_is_zero(bc_num num)
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{
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return bc_is_zero_for_scale(num, num->n_scale);
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}
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