/* $Id: misc.h,v 1.1.1.1 90/11/28 16:44:30 altenhof Exp $ */

/*
 * Copyright (C) 1990 by Digital Equipment Corporation.
 * 
 * Author: Michael P. Altenhofen, CEC Karlsruhe e-mail:
 * Altenhofen@kampus.enet.dec.com
 * 
 * This file ist part of Shared X
 * 
 * Permission to use, copy, modify, and distribute this software and its
 * documentation without fee is hereby granted, but only for non-profit  use
 * and distribution,  and provided  that the copyright notice and this notice
 * is preserved on all copies.
 * 
 * DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
 * DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
 * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#ifndef MISC_H
#define MISC_H 1

/*
 * X internal definitions
 */


extern unsigned long globalSerialNumber;

#ifndef NULL
#define NULL            0
#endif

#define MAXSCREENS	3
#define MAXCLIENTS	128
#define MAXFORMATS	8
#define MAXVISUALS_PER_SCREEN 50

typedef unsigned char *pointer;
typedef int Bool;

#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif

#define MILLI_PER_MIN (1000 * 60)
#define MILLI_PER_SECOND (1000)


/* byte swap a long literal */
#define lswapl(x) ((((x) & 0xff) << 24) |\
		   (((x) & 0xff00) << 8) |\
		   (((x) & 0xff0000) >> 8) |\
		   (((x) >> 24) & 0xff))

/* byte swap a short literal */
#define lswaps(x) ((((x) & 0xff) << 8) | (((x) >> 8) & 0xff))

#define min(a, b) (((a) < (b)) ? (a) : (b))
#define max(a, b) (((a) > (b)) ? (a) : (b))
#define abs(a) ((a) > 0 ? (a) : -(a))
#define fabs(a) ((a) > 0.0 ? (a) : -(a))	/* floating absolute value */
#define sign(x) ((x) < 0 ? -1 : ((x) > 0 ? 1 : 0))

/*
 * return the least significant bit in x which is set
 * 
 * This works on 1's complement and 2's complement machines. If you care about
 * the extra instruction on 2's complement machines, change to ((x) & (-(x)))
 */
#define lowbit(x) ((x) & (~(x) + 1))

#define MAXSHORT 32767
#define MINSHORT -MAXSHORT


/* byte swap a long */
#define swapl(x, n) n = ((char *) (x))[0];\
		 ((char *) (x))[0] = ((char *) (x))[3];\
		 ((char *) (x))[3] = n;\
		 n = ((char *) (x))[1];\
		 ((char *) (x))[1] = ((char *) (x))[2];\
		 ((char *) (x))[2] = n;

/* byte swap a short */
#define swaps(x, n) n = ((char *) (x))[0];\
		 ((char *) (x))[0] = ((char *) (x))[1];\
		 ((char *) (x))[1] = n



#endif				/* MISC_H */