1/* GTK - The GIMP Toolkit
2 * Copyright (C) 2011 Chun-wei Fan <fanc999@yahoo.com.tw>
3 *
4 * Author: Chun-wei Fan <fanc999@yahoo.com.tw>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <float.h>
21
22#ifndef HAVE_DECL_ISNAN
23/* it seems of the supported compilers only
24 * MSVC does not have isnan(), but it does
25 * have _isnan() which does the same as isnan()
26 */
27static inline gboolean
28isnan (double x)
29{
30 return _isnan (x);
31}
32#endif
33
34#ifndef HAVE_DECL_ISINF
35/* Unfortunately MSVC does not have finite()
36 * but it does have _finite() which is the same
37 * as finite() except when x is a NaN
38 */
39static inline gboolean
40isinf (double x)
41{
42 return (!_finite (x) && !_isnan (x));
43}
44#endif
45
46/* Workaround for round() for non-GCC/non-C99 compilers */
47#ifndef HAVE_ROUND
48static inline double
49round (double x)
50{
51 if (x >= 0)
52 return floor (x + 0.5);
53 else
54 return ceil (x - 0.5);
55}
56#endif
57