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/* _mpq_cmp_si -- compare mpq and long/ulong fraction.
Copyright 2001, 2013 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 Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library. If not, see https://www.gnu.org/licenses/. */
#include "gmp.h"
#include "gmp-impl.h"
/* Something like mpq_cmpabs_ui would be more useful for the neg/neg case,
and perhaps a version accepting a parameter to reverse the test, to make
it a tail call here. */
int
_mpq_cmp_si (mpq_srcptr q, long n, unsigned long d)
{
/* need canonical sign to get right result */
ASSERT (SIZ(DEN(q)) > 0);
if (SIZ(NUM(q)) >= 0)
{
if (n >= 0)
return _mpq_cmp_ui (q, n, d); /* >=0 cmp >=0 */
else
return 1; /* >=0 cmp <0 */
}
else
{
if (n >= 0)
return -1; /* <0 cmp >=0 */
else
{
mpq_t qabs;
SIZ(NUM(qabs)) = ABSIZ(NUM(q));
PTR(NUM(qabs)) = PTR(NUM(q));
SIZ(DEN(qabs)) = SIZ(DEN(q));
PTR(DEN(qabs)) = PTR(DEN(q));
return - _mpq_cmp_ui (qabs, NEG_CAST (unsigned long, n), d); /* <0 cmp <0 */
}
}
}
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