Annotation of embedaddon/php/ext/bcmath/libbcmath/src/num2long.c, revision 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:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>