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1 /*************************************************************************
2  *
3  * $Id$
4  *
5  * Copyright (C) 2001 Bjorn Reese <breese@users.sourceforge.net>
6  *
7  * Permission to use, copy, modify, and distribute this software for any
8  * purpose with or without fee is hereby granted, provided that the above
9  * copyright notice and this permission notice appear in all copies.
10  *
11  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
12  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
13  * MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE AUTHORS AND
14  * CONTRIBUTORS ACCEPT NO RESPONSIBILITY IN ANY CONCEIVABLE MANNER.
15  *
16  ************************************************************************/
17 
18 #ifndef TRIO_NAN_H
19 #define TRIO_NAN_H
20 
21 #include "triodef.h"
22 
23 #ifdef __cplusplus
24 extern "C" {
25 #endif
26 
27 enum {
28   TRIO_FP_INFINITE,
29   TRIO_FP_NAN,
30   TRIO_FP_NORMAL,
31   TRIO_FP_SUBNORMAL,
32   TRIO_FP_ZERO
33 };
34 
35 /*
36  * Return NaN (Not-a-Number).
37  */
38 TRIO_PUBLIC double trio_nan TRIO_PROTO((void));
39 
40 /*
41  * Return positive infinity.
42  */
43 TRIO_PUBLIC double trio_pinf TRIO_PROTO((void));
44 
45 /*
46  * Return negative infinity.
47  */
48 TRIO_PUBLIC double trio_ninf TRIO_PROTO((void));
49 
50 /*
51  * Return negative zero.
52  */
53 TRIO_PUBLIC double trio_nzero TRIO_PROTO((TRIO_NOARGS));
54 
55 /*
56  * If number is a NaN return non-zero, otherwise return zero.
57  */
58 TRIO_PUBLIC int trio_isnan TRIO_PROTO((double number));
59 
60 /*
61  * If number is positive infinity return 1, if number is negative
62  * infinity return -1, otherwise return 0.
63  */
64 TRIO_PUBLIC int trio_isinf TRIO_PROTO((double number));
65 
66 /*
67  * If number is finite return non-zero, otherwise return zero.
68  */
69 #if 0
70 	/* Temporary fix - these 2 routines not used in libxml */
71 TRIO_PUBLIC int trio_isfinite TRIO_PROTO((double number));
72 
73 TRIO_PUBLIC int trio_fpclassify TRIO_PROTO((double number));
74 #endif
75 
76 TRIO_PUBLIC int trio_signbit TRIO_PROTO((double number));
77 
78 TRIO_PUBLIC int trio_fpclassify_and_signbit TRIO_PROTO((double number, int *is_negative));
79 
80 #ifdef __cplusplus
81 }
82 #endif
83 
84 #endif /* TRIO_NAN_H */
85