diff options
Diffstat (limited to 'ext/bcmath/libbcmath/src/raise.c')
-rw-r--r-- | ext/bcmath/libbcmath/src/raise.c | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/ext/bcmath/libbcmath/src/raise.c b/ext/bcmath/libbcmath/src/raise.c deleted file mode 100644 index 5f2f03c208..0000000000 --- a/ext/bcmath/libbcmath/src/raise.c +++ /dev/null @@ -1,126 +0,0 @@ -/* raise.c: bcmath library file. */ -/* - Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc. - Copyright (C) 2000 Philip A. Nelson - - This library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2 of the License, or (at your option) any later version. - - This library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. (COPYING.LIB) - - You should have received a copy of the GNU Lesser General Public - License along with this library; if not, write to: - - The Free Software Foundation, Inc. - 59 Temple Place, Suite 330 - Boston, MA 02111-1307 USA. - - You may contact the author by: - e-mail: philnelson@acm.org - us-mail: Philip A. Nelson - Computer Science Department, 9062 - Western Washington University - Bellingham, WA 98226-9062 - -*************************************************************************/ - -#include <config.h> -#include <stdio.h> -#include <assert.h> -#include <stdlib.h> -#include <ctype.h> -#include <stdarg.h> -#include "bcmath.h" -#include "private.h" - - -/* Raise NUM1 to the NUM2 power. The result is placed in RESULT. - Maximum exponent is LONG_MAX. If a NUM2 is not an integer, - only the integer part is used. */ - -void -bc_raise (num1, num2, result, scale) - bc_num num1, num2, *result; - int scale; -{ - bc_num temp, power; - long exponent; - int rscale; - int pwrscale; - int calcscale; - char neg; - - /* Check the exponent for scale digits and convert to a long. */ - if (num2->n_scale != 0) - bc_rt_warn ("non-zero scale in exponent"); - exponent = bc_num2long (num2); - if (exponent == 0 && (num2->n_len > 1 || num2->n_value[0] != 0)) - bc_rt_error ("exponent too large in raise"); - - /* Special case if exponent is a zero. */ - if (exponent == 0) - { - bc_free_num (result); - *result = bc_copy_num (_one_); - return; - } - - /* Other initializations. */ - if (exponent < 0) - { - neg = TRUE; - exponent = -exponent; - rscale = scale; - } - else - { - neg = FALSE; - rscale = MIN (num1->n_scale*exponent, MAX(scale, num1->n_scale)); - } - - /* Set initial value of temp. */ - power = bc_copy_num (num1); - pwrscale = num1->n_scale; - while ((exponent & 1) == 0) - { - pwrscale = 2*pwrscale; - bc_multiply (power, power, &power, pwrscale); - exponent = exponent >> 1; - } - temp = bc_copy_num (power); - calcscale = pwrscale; - exponent = exponent >> 1; - - /* Do the calculation. */ - while (exponent > 0) - { - pwrscale = 2*pwrscale; - bc_multiply (power, power, &power, pwrscale); - if ((exponent & 1) == 1) { - calcscale = pwrscale + calcscale; - bc_multiply (temp, power, &temp, calcscale); - } - exponent = exponent >> 1; - } - - /* Assign the value. */ - if (neg) - { - bc_divide (_one_, temp, result, rscale); - bc_free_num (&temp); - } - else - { - bc_free_num (result); - *result = temp; - if ((*result)->n_scale > rscale) - (*result)->n_scale = rscale; - } - bc_free_num (&power); -} - |