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78 lines
1.2 KiB
C
78 lines
1.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* isinf.c
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*
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* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/port/isinf.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "c.h"
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#include <float.h>
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#include <math.h>
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#if HAVE_FPCLASS /* this is _not_ HAVE_FP_CLASS, and not typo */
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#if HAVE_IEEEFP_H
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#include <ieeefp.h>
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#endif
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int
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isinf(double d)
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{
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fpclass_t type = fpclass(d);
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switch (type)
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{
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case FP_NINF:
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case FP_PINF:
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return 1;
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default:
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break;
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}
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return 0;
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}
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#else
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#if defined(HAVE_FP_CLASS) || defined(HAVE_FP_CLASS_D)
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#if HAVE_FP_CLASS_H
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#include <fp_class.h>
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#endif
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int
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isinf(x)
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double x;
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{
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#if HAVE_FP_CLASS
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int fpclass = fp_class(x);
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#else
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int fpclass = fp_class_d(x);
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#endif
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if (fpclass == FP_POS_INF)
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return 1;
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if (fpclass == FP_NEG_INF)
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return -1;
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return 0;
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}
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#elif defined(HAVE_CLASS)
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int
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isinf(double x)
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{
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int fpclass = class(x);
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if (fpclass == FP_PLUS_INF)
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return 1;
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if (fpclass == FP_MINUS_INF)
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return -1;
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return 0;
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}
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#endif
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#endif
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