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