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      1 /*************************************************************************
      2  *
      3  * $Id$
      4  *
      5  * Copyright (C) 2001 Bjorn Reese <breese (at) 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