操作系统源代码

				/*				 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.				 * See the copyright notice in the ACK home directory, in the file "Copyright".				 */				/* $Header: div.c,v 1.3 90/03/05 13:47:53 eck Exp $ */								#include									static int tmp = -1;								div_t				div(register int numer, register int denom)				{					div_t r;									/* The assignment of tmp should not be optimized !! */					if (tmp == -1) {						tmp = (tmp / 2 == 0);					}					if (numer == 0) {						r.quot = numer / denom;		/* might trap if denom == 0 */						r.rem = numer % denom;					} else if ( !tmp && ((numer < 0) != (denom < 0))) {						r.quot = (numer / denom) + 1;						r.rem = numer - (numer / denom + 1) * denom;					} else {						r.quot = numer / denom;						r.rem = numer % denom;					}					return r;				}