99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/* div.c - div file for stdlib */
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/* Copyright 1992-2001 Wind River Systems, Inc. */
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/*
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modification history
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--------------------
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01g,25sep01,gls fixed div_r to check for negative numerator (SPR #30636)
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01f,10feb95,jdi doc format tweak.
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01e,08feb93,jdi documentation cleanup for 5.1.
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01d,20sep92,smb documentation additions.
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01c,24jul92,smb corrected parameter ordering.
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01b,24jul92,smb added reentrant version for div()
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01a,19jul92,smb written and documented.
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*/
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/*
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DESCRIPTION
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INCLUDE FILES: stdlib.h
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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 "stdlib.h"
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/*******************************************************************************
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*
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* div - compute a quotient and remainder (ANSI)
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*
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* This routine computes the quotient and remainder of <numer>/<denom>.
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* If the division is inexact, the resulting quotient is the integer of lesser
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* magnitude that is the nearest to the algebraic quotient. If the result cannot
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* be represented, the behavior is undefined; otherwise, `quot' * <denom> + `rem'
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* equals <numer>.
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*
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* INCLUDE FILES: stdlib.h
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*
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* RETURNS:
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* A structure of type `div_t', containing both the quotient and the
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* remainder.
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*
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* INTERNAL
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* The structure shall contain the following members, in either order:
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* int quot; * quotient *
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* int rem; * remainder *
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*/
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div_t div
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(
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int numer, /* numerator */
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int denom /* denominator */
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)
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{
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static div_t divStruct; /* div_t structure */
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div_r (numer, denom, &divStruct);
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return (divStruct);
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}
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/*******************************************************************************
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*
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* div_r - compute a quotient and remainder (reentrant)
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*
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* This routine computes the quotient and remainder of <numer>/<denom>.
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* The quotient and remainder are stored in the `div_t' structure
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* pointed to by <divStructPtr>.
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*
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* This routine is the reentrant version of div().
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*
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* INCLUDE FILES: stdlib.h
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*
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* RETURNS: N/A
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*/
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void div_r
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(
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int numer, /* numerator */
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int denom, /* denominator */
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div_t * divStructPtr /* div_t structure */
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)
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{
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/* calculate quotient */
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divStructPtr->quot = numer / denom;
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/* calculate remainder */
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divStructPtr->rem = numer - (denom * divStructPtr->quot);
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/* check for negative numerator */
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if ((numer < 0) && (divStructPtr->rem > 0))
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{
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divStructPtr->quot++;
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divStructPtr->rem -= denom;
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}
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}
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