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Annotation of embedaddon/php/ext/bcmath/libbcmath/src/nearzero.c, revision 1.1

1.1     ! misho       1: /* nearzero.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: /* In some places we need to check if the number NUM is almost zero.
        !            42:    Specifically, all but the last digit is 0 and the last digit is 1.
        !            43:    Last digit is defined by scale. */
        !            44: 
        !            45: char
        !            46: bc_is_near_zero (num, scale)
        !            47:      bc_num num;
        !            48:      int scale;
        !            49: {
        !            50:   int  count;
        !            51:   char *nptr;
        !            52: 
        !            53:   /* Error checking */
        !            54:   if (scale > num->n_scale)
        !            55:     scale = num->n_scale;
        !            56: 
        !            57:   /* Initialize */
        !            58:   count = num->n_len + scale;
        !            59:   nptr = num->n_value;
        !            60: 
        !            61:   /* The check */
        !            62:   while ((count > 0) && (*nptr++ == 0)) count--;
        !            63: 
        !            64:   if (count != 0 && (count != 1 || *--nptr != 1))
        !            65:     return FALSE;
        !            66:   else
        !            67:     return TRUE;
        !            68: }
        !            69: