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

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: