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45 lines
736 B
C
45 lines
736 B
C
/*
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* return (*acc) scaled by 10**dexp.
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*/
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#include <_ansi.h>
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#include <reent.h>
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#include "std.h"
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#define abs(x) (((x) < 0) ? -(x) : (x))
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double
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_DEFUN (__adjust, (ptr, acc, dexp, sign),
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struct _reent *ptr _AND
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double *acc _AND
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int dexp _AND
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int sign)
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/* *acc the 64 bit accumulator */
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/* dexp decimal exponent */
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/* sign sign flag */
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{
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double r;
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if (dexp > MAXE)
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{
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ptr->_errno = ERANGE;
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return (sign) ? -HUGE_VAL : HUGE_VAL;
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}
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else if (dexp < MINE)
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{
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ptr->_errno = ERANGE;
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return 0.0;
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}
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r = *acc;
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if (sign)
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r = -r;
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if (dexp == 0)
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return r;
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if (dexp < 0)
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return r / __exp10 (abs (dexp));
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else
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return r * __exp10 (dexp);
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}
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