61 lines
1.8 KiB
C
61 lines
1.8 KiB
C

/* mpz_mmod  Mathematical MODulo, i.e. with the remainder



nonnegative.






Copyright (C) 1991, 1992 Free Software Foundation, Inc.






This file is part of the GNU MP Library.






The GNU MP Library is free software; you can redistribute it and/or modify



it under the terms of the GNU General Public License as published by



the Free Software Foundation; either version 2, or (at your option)



any later version.






The GNU MP 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 General Public License for more details.






You should have received a copy of the GNU General Public License



along with the GNU MP Library; see the file COPYING. If not, write to



the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */






#include "gmp.h"



#include "gmpimpl.h"






void



#ifdef __STDC__



mpz_mmod (MP_INT *rem,



const MP_INT *dividend, const MP_INT *divisor)



#else



mpz_mmod (rem, dividend, divisor)



MP_INT *rem;



const MP_INT *dividend;



const MP_INT *divisor;



#endif



{



if ((dividend>size ^ divisor>size) >= 0)



{



/* When the dividend and the divisor has same sign, this function



gives same result as mpz_mod. */



mpz_mod (rem, dividend, divisor);



}



else



{



MP_INT temp_divisor; /* N.B.: lives until function returns! */






/* We need the original value of the divisor after the remainder has



been preliminary calculated. We have to copy it to temporary



space if it's the same variable as REM. */



if (rem == divisor)



{



MPZ_TMP_INIT (&temp_divisor, ABS (divisor>size));



mpz_set (&temp_divisor, divisor);



divisor = &temp_divisor;



}






mpz_mod (rem, dividend, divisor);



if (rem>size != 0)



mpz_add (rem, rem, divisor);



}



}
