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/*
Copyright (C) 2018 Daniel Schultz
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "fmpz.h"
#include "mpoly.h"
int mpoly_is_gen(ulong * exps, slong var, flint_bitcnt_t bits,
const mpoly_ctx_t mctx)
{
int ret;
slong i;
fmpz * unpacked_exps;
TMP_INIT;
TMP_START;
unpacked_exps = (fmpz *) TMP_ALLOC(mctx->nvars*sizeof(fmpz));
for (i = 0; i < mctx->nvars; i++)
fmpz_init(unpacked_exps + i);
mpoly_get_monomial_ffmpz(unpacked_exps, exps, bits, mctx);
if (var >= 0)
{
ret = 1;
for (i = 0; i < mctx->nvars; i++)
{
if (!fmpz_equal_si(unpacked_exps + i, i == var))
{
ret = 0;
break;
}
}
}
else
{
int count = 0;
for (i = 0; i < mctx->nvars; i++)
{
if (fmpz_is_one(unpacked_exps + i))
{
count++;
if (count > 1)
break;
}
else if (!fmpz_is_zero(unpacked_exps + i))
{
count = 2;
break;
}
}
ret = (count == 1);
}
for (i = 0; i < mctx->nvars; i++)
fmpz_clear(unpacked_exps + i);
TMP_END;
return ret;
}