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Annotation of embedaddon/php/ext/bcmath/libbcmath/src/num2long.c, revision 1.1.1.1

1.1       misho       1: /* num2long.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: /* Convert a number NUM to a long.  The function returns only the integer
                     42:    part of the number.  For numbers that are too large to represent as
                     43:    a long, this function returns a zero.  This can be detected by checking
                     44:    the NUM for zero after having a zero returned. */
                     45: 
                     46: long
                     47: bc_num2long (num)
                     48:      bc_num num;
                     49: {
                     50:   long val;
                     51:   char *nptr;
                     52:   int  index;
                     53: 
                     54:   /* Extract the int value, ignore the fraction. */
                     55:   val = 0;
                     56:   nptr = num->n_value;
                     57:   for (index=num->n_len; (index>0) && (val<=(LONG_MAX/BASE)); index--)
                     58:     val = val*BASE + *nptr++;
                     59: 
                     60:   /* Check for overflow.  If overflow, return zero. */
                     61:   if (index>0) val = 0;
                     62:   if (val < 0) val = 0;
                     63: 
                     64:   /* Return the value. */
                     65:   if (num->n_sign == PLUS)
                     66:     return (val);
                     67:   else
                     68:     return (-val);
                     69: }
                     70: