1 | /* mpz_cdiv_r -- Division rounding the quotient towards +infinity. The |
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2 | remainder gets the opposite sign as the denominator. |
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3 | |
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4 | Copyright 1994, 1995, 1996, 2001 Free Software Foundation, Inc. |
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5 | |
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6 | This file is part of the GNU MP Library. |
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7 | |
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8 | The GNU MP Library is free software; you can redistribute it and/or modify |
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9 | it under the terms of the GNU Lesser General Public License as published by |
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10 | the Free Software Foundation; either version 2.1 of the License, or (at your |
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11 | option) any later version. |
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12 | |
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13 | The GNU MP Library is distributed in the hope that it will be useful, but |
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14 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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15 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
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16 | License for more details. |
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17 | |
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18 | You should have received a copy of the GNU Lesser General Public License |
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19 | along with the GNU MP Library; see the file COPYING.LIB. If not, write to |
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20 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
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21 | MA 02111-1307, USA. */ |
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22 | |
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23 | #include "gmp.h" |
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24 | #include "gmp-impl.h" |
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25 | |
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26 | void |
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27 | mpz_cdiv_r (mpz_ptr rem, mpz_srcptr dividend, mpz_srcptr divisor) |
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28 | { |
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29 | mp_size_t divisor_size = divisor->_mp_size; |
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30 | mpz_t temp_divisor; /* N.B.: lives until function returns! */ |
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31 | TMP_DECL (marker); |
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32 | |
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33 | TMP_MARK (marker); |
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34 | |
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35 | /* We need the original value of the divisor after the remainder has been |
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36 | preliminary calculated. We have to copy it to temporary space if it's |
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37 | the same variable as REM. */ |
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38 | if (rem == divisor) |
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39 | { |
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40 | |
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41 | MPZ_TMP_INIT (temp_divisor, ABS (divisor_size)); |
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42 | mpz_set (temp_divisor, divisor); |
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43 | divisor = temp_divisor; |
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44 | } |
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45 | |
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46 | mpz_tdiv_r (rem, dividend, divisor); |
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47 | |
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48 | if ((divisor_size ^ dividend->_mp_size) >= 0 && rem->_mp_size != 0) |
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49 | mpz_sub (rem, rem, divisor); |
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50 | |
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51 | TMP_FREE (marker); |
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52 | } |
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