/*
 * xtime.h
 *
 * x-kernel v3.3
 *
 * Copyright (c) 1993,1991,1990,1996  Arizona Board of Regents
 *
 * $Revision: 1.2 $
 * $Date: 1996/01/29 20:25:55 $
 */

/* Same time structure as Unix */

#ifndef xtime_h
#define xtime_h

typedef struct {
    long sec;
    long usec;
} XTime;

#ifdef __STDC__

/* set *t to the current time of day */
void xGetTime(XTime *t);

#endif /* __STDC__ */

/* 
 * xAddtime -- Sets the XTime value _res to the sum of _t1 and _t2.
 * Assumes _t1 and _t2 are in standard time format (i.e., does not
 * check for integer overflow of the usec value.)
 */
#define xAddTime(_res, _t1, _t2)                         \
    do {                                                 \
	(_res)->sec = (_t1).sec + (_t2).sec;             \
	(_res)->usec = (_t1).usec + (_t2).usec;          \
	if ((_res)->usec >= (1000 * 1000)) {             \
	    (_res)->sec += (_res)->usec / (1000 * 1000); \
	    (_res)->usec %= (u_int)(1000 * 1000);        \
	}                                                \
    } while (0)

/* 
 * xSubTime -- Sets _res to the difference of _t1 and _t2.  The resulting
 * value may be negative.
 */
#define xSubTime(_res, _t1, _t2)                \
    do {                                        \
	(_res)->sec = (_t1).sec - (_t2).sec;    \
	(_res)->usec = (_t1).usec - (_t2).usec; \
	if ((_res)->usec < 0) {                 \
	    (_res)->usec += (1000 * 1000);      \
	    (_res)->sec -= 1;                   \
	}                                       \
    } while (0)

#endif /* ! xtime.h */