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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
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/* add.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 "private.h"
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#include <stddef.h>
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#include <string.h>
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/* Here is the full add routine that takes care of negative numbers.
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N1 is added to N2 and the result placed into RESULT. SCALE_MIN
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is the minimum scale for the result. */
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void bc_add (bc_num n1, bc_num n2, bc_num *result, size_t scale_min)
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{
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bc_num sum = NULL;
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int cmp_res;
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size_t res_scale;
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if (n1->n_sign == n2->n_sign) {
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sum = _bc_do_add (n1, n2, scale_min);
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sum->n_sign = n1->n_sign;
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} else {
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/* subtraction must be done. */
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/* Compare magnitudes. */
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cmp_res = _bc_do_compare(n1, n2, false, false);
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switch (cmp_res) {
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case -1:
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/* n1 is less than n2, subtract n1 from n2. */
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sum = _bc_do_sub (n2, n1, scale_min);
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sum->n_sign = n2->n_sign;
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break;
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case 0:
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/* They are equal! return zero with the correct scale! */
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res_scale = MAX (scale_min, MAX(n1->n_scale, n2->n_scale));
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sum = bc_new_num (1, res_scale);
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memset (sum->n_value, 0, res_scale+1);
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break;
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case 1:
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/* n2 is less than n1, subtract n2 from n1. */
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sum = _bc_do_sub (n1, n2, scale_min);
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sum->n_sign = n1->n_sign;
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}
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}
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/* Clean up and return. */
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bc_free_num (result);
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*result = sum;
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}
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