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66 lines
1.6 KiB
66 lines
1.6 KiB
/***
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*modf.c - modf()
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*
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* Copyright (c) 1991-1991, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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*
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*Revision History:
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* 8-24-91 GDP written
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* 1-13-92 GDP support IEEE exceptions
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* 06-04-92 XY change to long double version
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*
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*******************************************************************************/
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#include <math.h>
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#include <transl.h>
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extern long double _frndl(long double);
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/***
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*long double modf(long double x, long double *intptr)
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*
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*Purpose:
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* Split x into fractional and integer part
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* The signed fractional portion is returned
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* The integer portion is stored as a floating point value at intptr
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*
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*Entry:
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*
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*Exit:
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*
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*Exceptions:
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* I
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*******************************************************************************/
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static unsigned int newcw = (ICW & ~IMCW_RC) | (IRC_CHOP & IMCW_RC);
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long double modfl(long double x, long double *intptr)
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{
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unsigned int savedcw;
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long double result,intpart;
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/* save user fp control word */
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savedcw = _ctrlfp(0,0);
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_ctrlfp(newcw,IMCW); /* round towards 0 */
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/* check for infinity or NAN */
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if (IS_LD_SPECIAL(x)){
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*intptr = QNAN_MODF;
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switch (_sptypel(x)) {
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case T_PINF:
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case T_NINF:
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return _except1(FP_I, OP_MODF, x, QNAN_MODF, savedcw);
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case T_QNAN:
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return _handle_qnan1(OP_MODF, x, savedcw);
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default: //T_SNAN
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return _except1(FP_I, OP_MODF, x, _s2qnan(x), savedcw);
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}
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}
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intpart = _frndl(x); //fix needed: this may set the P exception flag
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//and pollute the fp status word
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*intptr = intpart;
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result = x - intpart;
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RETURN(savedcw,result);
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}
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