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82 lines
1.0 KiB
82 lines
1.0 KiB
/* $Id: isinf.c,v 1.18 2001/10/28 06:25:47 momjian Exp $ */
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#include "c.h"
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#include <math.h>
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#if HAVE_FPCLASS /* this is _not_ HAVE_FP_CLASS, and not
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* 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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#ifdef __QNX__
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#include <float.h>
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int
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isinf(double x)
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{
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if (x == HUGE_VAL)
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return 1;
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if (x == -HUGE_VAL)
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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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