1 /* mpf_integer_p -- test whether an mpf is an integer */
2
3 /*
4 Copyright 2001, 2002, 2014-2015 Free Software Foundation, Inc.
5
6 This file is part of the GNU MP Library.
7
8 The GNU MP Library is free software; you can redistribute it and/or modify
9 it under the terms of either:
10
11 * the GNU Lesser General Public License as published by the Free
12 Software Foundation; either version 3 of the License, or (at your
13 option) any later version.
14
15 or
16
17 * the GNU General Public License as published by the Free Software
18 Foundation; either version 2 of the License, or (at your option) any
19 later version.
20
21 or both in parallel, as here.
22
23 The GNU MP Library is distributed in the hope that it will be useful, but
24 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
25 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
26 for more details.
27
28 You should have received copies of the GNU General Public License and the
29 GNU Lesser General Public License along with the GNU MP Library. If not,
30 see https://www.gnu.org/licenses/. */
31
32 #include "gmp-impl.h"
33
34
35 int
mpf_integer_p(mpf_srcptr f)36 mpf_integer_p (mpf_srcptr f) __GMP_NOTHROW
37 {
38 mp_srcptr fp;
39 mp_exp_t exp;
40 mp_size_t size;
41
42 size = SIZ (f);
43 exp = EXP (f);
44 if (exp <= 0)
45 return (size == 0); /* zero is an integer,
46 others have only fraction limbs */
47 size = ABS (size);
48
49 /* Ignore zeroes at the low end of F. */
50 for (fp = PTR (f); *fp == 0; ++fp)
51 --size;
52
53 /* no fraction limbs */
54 return size <= exp;
55 }
56