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Annotation of embedaddon/php/ext/bcmath/libbcmath/src/divmod.c, revision 1.1.1.1

1.1       misho       1: /* divmod.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: 
                     42: /* Division *and* modulo for numbers.  This computes both NUM1 / NUM2 and
                     43:    NUM1 % NUM2  and puts the results in QUOT and REM, except that if QUOT
                     44:    is NULL then that store will be omitted.
                     45:  */
                     46: 
                     47: int
                     48: bc_divmod (bc_num num1, bc_num num2, bc_num *quot, bc_num *rem, int scale TSRMLS_DC)
                     49: {
                     50:   bc_num quotient = NULL;
                     51:   bc_num temp;
                     52:   int rscale;
                     53: 
                     54:   /* Check for correct numbers. */
                     55:   if (bc_is_zero (num2 TSRMLS_CC)) return -1;
                     56: 
                     57:   /* Calculate final scale. */
                     58:   rscale = MAX (num1->n_scale, num2->n_scale+scale);
                     59:   bc_init_num(&temp TSRMLS_CC);
                     60: 
                     61:   /* Calculate it. */
                     62:   bc_divide (num1, num2, &temp, scale TSRMLS_CC);
                     63:   if (quot)
                     64:     quotient = bc_copy_num (temp);
                     65:   bc_multiply (temp, num2, &temp, rscale TSRMLS_CC);
                     66:   bc_sub (num1, temp, rem, rscale);
                     67:   bc_free_num (&temp);
                     68: 
                     69:   if (quot)
                     70:     {
                     71:       bc_free_num (quot);
                     72:       *quot = quotient;
                     73:     }
                     74: 
                     75:   return 0;    /* Everything is OK. */
                     76: }
                     77: 
                     78: 
                     79: /* Modulo for numbers.  This computes NUM1 % NUM2  and puts the
                     80:    result in RESULT.   */
                     81: 
                     82: int
                     83: bc_modulo (bc_num num1, bc_num num2, bc_num *result, int scale TSRMLS_DC)
                     84: {
                     85:   return bc_divmod (num1, num2, NULL, result, scale TSRMLS_CC);
                     86: }
                     87: