68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
/* floor.c - floor math routine */
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/* Copyright 1992-1993 Wind River Systems, Inc. */
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/*
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modification history
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--------------------
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01g,17nov00,tkt return itself if it is ZERO or INF.
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01g,04may01,agf fix return value of INF
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01f,05feb93,jdi doc changes based on kdl review.
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01e,02dec92,jdi doc tweaks.
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01d,28oct92,jdi documentation cleanup.
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01c,20sep92,smb documentation additions
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01b,30jul92,kdl changed _d_type() calls to fpTypeGet().
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01a,08jul92,smb documentation.
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*/
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/*
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DESCRIPTION
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SEE ALSO: American National Standard X3.159-1989
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NOMANUAL
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*/
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#include "vxWorks.h"
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#include "math.h"
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#include "stddef.h"
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#include "errno.h"
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#include "private/mathP.h"
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/*******************************************************************************
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*
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* floor - compute the largest integer less than or equal to a specified value (ANSI)
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*
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* This routine returns the largest integer less than or equal to <v>, in
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* double precision.
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*
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* INCLUDE FILES: math.h
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*
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* RETURNS:
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* The largest integral value less than or equal to <v>, in double precision.
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*
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* SEE ALSO: mathALib
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*/
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double floor
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(
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double v /* value to find the floor of */
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)
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{
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double r;
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switch (fpTypeGet (v, &r)) /* find out the type of v */
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{
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case ZERO: return (0);
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case INF:
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case NAN: return (v);
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case INTEGER: return (v);
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case REAL: return (((v < 0.0) && (v != r)) ? (r - 1.0) : (r));
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default: return (0); /* this should never happen */
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}
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}
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