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