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DIV.C
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C/C++ Source or Header
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1992-03-02
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2KB
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65 lines
/* This file may have been modified by DJ Delorie (Jan 1991). If so,
** these modifications are Coyright (C) 1991 DJ Delorie, 24 Kirsten Ave,
** Rochester NH, 03867-2954, USA.
*/
/*
* Copyright (c) 1990 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* Redistribution and use in source and binary forms are permitted
* provided that: (1) source distributions retain this entire copyright
* notice and comment, and (2) distributions including binaries display
* the following acknowledgement: ``This product includes software
* developed by the University of California, Berkeley and its contributors''
* in the documentation or other materials provided with the distribution
* and in all advertising materials mentioning features or use of this
* software. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)div.c 5.1 (Berkeley) 5/16/90";
#endif /* LIBC_SCCS and not lint */
#include <stdlib.h> /* div_t */
/*
* I AM NOT SURE THIS IS COMPLETELY PORTABLE
* (or that it is even right)
*/
div_t
div(num, denom)
int num, denom;
{
div_t r;
/* avoid deep thought */
if (num > 0 && denom < 0) {
num = -num;
denom = -denom;
}
r.quot = num / denom;
r.rem = num % denom;
if (num < 0 && denom > 0) {
/*
* Machine division and remainer may work either way. The
* ANSI standard says that |r.quot| < |n/d| (where n/d
* computed in infinite precision). If the remainder is
* positive, we got the `wrong' answer, so fix it.
*/
if (r.rem > 0) {
r.quot++;
r.rem -= denom;
}
}
return (r);
}