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/* parifact.cc: integer factorization using libpari, interface via strings */
//////////////////////////////////////////////////////////////////////////
//
// Copyright 1990-2012 John Cremona
//
// This file is part of the eclib package.
//
// eclib 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 of the License, or (at your
// option) any later version.
//
// eclib 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 eclib; if not, write to the Free Software Foundation,
// Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
//
//////////////////////////////////////////////////////////////////////////
#ifdef USE_PARI_FACTORING
#include <pari/pari.h>
#include <eclib/parifact.h>
//#define DEBUG_GPFACT
#include <iostream>
using namespace std;
string
factor(const string n)
{
if (!avma) {
pari_init(1000000, 1000000);
}
#ifdef DEBUG_GPFACT
std::cout<<"factor called with "<<n<<endl;
#endif
pari_sp av=avma; // store pari stack pointer
GEN x = strtoi(n.c_str());
setsigne(x,1);
x = gel(Z_factor(x),1);
settyp(x,t_VEC);
string ans(GENtostr(x));
avma=av; // restore pari stackpointer
return ans;
}
int
is_prime(const string p)
{
if (!avma) {
pari_init(1000000, 1000000);
}
pari_sp av=avma; // store pari stack pointer
#ifdef DEBUG_GPFACT
std::cout<<"is_prime called with "<<p<<"..."<<flush;
#endif
int ans = (isprime((GEN)strtoi(p.c_str()))==1);
#ifdef DEBUG_GPFACT
std::cout<<"and returns "<<ans<<std::endl;
#endif
avma=av; // restore pari stackpointer
return ans;
}
#endif
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