40 lines
588 B
C
40 lines
588 B
C
#include <assert.h>
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#include <math.h>
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/* functions missing here are architecture-specific and are in i386/float */
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int isfinite(double x)
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{
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/* return value based on classification */
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switch (fpclassify(x))
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{
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case FP_INFINITE:
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case FP_NAN:
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return 0;
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case FP_NORMAL:
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case FP_SUBNORMAL:
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case FP_ZERO:
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return 1;
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}
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/* if we get here, fpclassify is buggy */
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assert(0);
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return -1;
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}
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int isinf(double x)
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{
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return fpclassify(x) == FP_INFINITE;
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}
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int isnan(double x)
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{
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return fpclassify(x) == FP_NAN;
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}
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int isnormal(double x)
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{
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return fpclassify(x) == FP_NORMAL;
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}
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