general.h

早期freebsd实现

/*-
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)general.h	8.1 (Berkeley) 6/6/93
 */

/*
 * Some general definitions.
 */

#define	numberof(x)	(sizeof x/sizeof x[0])
#define	highestof(x)	(numberof(x)-1)

#if	defined(unix)
#define	ClearElement(x)		bzero((char *)&x, sizeof x)
#define	ClearArray(x)		bzero((char *)x, sizeof x)
#else	/* defined(unix) */
#define	ClearElement(x)		memset((char *)&x, 0, sizeof x)
#define	ClearArray(x)		memset((char *)x, 0, sizeof x)
#endif	/* defined(unix) */

#if	defined(unix)		/* Define BSD equivalent mem* functions */
#define	memcpy(dest,src,n)	bcopy(src,dest,n)
#define	memmove(dest,src,n)	bcopy(src,dest,n)
#define	memset(s,c,n)		if (c == 0) { \
				    bzero(s,n); \
				} else { \
				    register char *src = s; \
				    register int count = n; \
					\
				    while (count--) { \
					*src++ = c; \
				    } \
				}
#define	memcmp(s1,s2,n)		bcmp(s1,s2,n)
#endif	/* defined(unix) */