/* div.c - div file for stdlib */ /* Copyright 1992-2001 Wind River Systems, Inc. */ /* modification history -------------------- 01g,25sep01,gls fixed div_r to check for negative numerator (SPR #30636) 01f,10feb95,jdi doc format tweak. 01e,08feb93,jdi documentation cleanup for 5.1. 01d,20sep92,smb documentation additions. 01c,24jul92,smb corrected parameter ordering. 01b,24jul92,smb added reentrant version for div() 01a,19jul92,smb written and documented. */ /* DESCRIPTION INCLUDE FILES: stdlib.h SEE ALSO: American National Standard X3.159-1989 NOMANUAL */ #include "vxWorks.h" #include "stdlib.h" /******************************************************************************* * * div - compute a quotient and remainder (ANSI) * * This routine computes the quotient and remainder of /. * If the division is inexact, the resulting quotient is the integer of lesser * magnitude that is the nearest to the algebraic quotient. If the result cannot * be represented, the behavior is undefined; otherwise, `quot' * + `rem' * equals . * * INCLUDE FILES: stdlib.h * * RETURNS: * A structure of type `div_t', containing both the quotient and the * remainder. * * INTERNAL * The structure shall contain the following members, in either order: * int quot; * quotient * * int rem; * remainder * */ div_t div ( int numer, /* numerator */ int denom /* denominator */ ) { static div_t divStruct; /* div_t structure */ div_r (numer, denom, &divStruct); return (divStruct); } /******************************************************************************* * * div_r - compute a quotient and remainder (reentrant) * * This routine computes the quotient and remainder of /. * The quotient and remainder are stored in the `div_t' structure * pointed to by . * * This routine is the reentrant version of div(). * * INCLUDE FILES: stdlib.h * * RETURNS: N/A */ void div_r ( int numer, /* numerator */ int denom, /* denominator */ div_t * divStructPtr /* div_t structure */ ) { /* calculate quotient */ divStructPtr->quot = numer / denom; /* calculate remainder */ divStructPtr->rem = numer - (denom * divStructPtr->quot); /* check for negative numerator */ if ((numer < 0) && (divStructPtr->rem > 0)) { divStructPtr->quot++; divStructPtr->rem -= denom; } }
