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25 lines
619 B
C
25 lines
619 B
C
/**
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* This file has no copyright assigned and is placed in the Public Domain.
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* This file is part of the mingw-w64 runtime package.
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* No warranty is given; refer to the file DISCLAIMER.PD within this package.
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*/
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#include <math.h>
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#include <errno.h>
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double
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fdim (double x, double y)
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{
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int cx = fpclassify (x), cy = fpclassify (y);
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double r;
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if (cx == FP_NAN || cy == FP_NAN
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|| (y < 0 && cx == FP_INFINITE && cy == FP_INFINITE))
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return x - y; /* Take care invalid flag is raised. */
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if (x <= y)
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return 0.0;
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r = x - y;
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if (fpclassify (r) == FP_INFINITE)
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errno = ERANGE;
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return r;
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}
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