Operating System lab1（操作系统课程设计实验1)

操作步骤
把如下文件放到一个目录下
再依次执行以下命令

make
mkdir web
./webserver 8088 ./web

display.c

/*
 * Copyright (c) 1989, 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.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)display.c	8.1 (Berkeley) 6/6/93";
#endif
#endif /* not lint */
#include <sys/cdefs.h>

#include <sys/param.h>
#include <sys/stat.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "hexdump.h"

enum _vflag vflag = FIRST;

static off_t address;			/* address/offset in stream */
static off_t eaddress;			/* end address */

static __inline void print(PR *, u_char *);

void
display(void)
{
   
	FS *fs;
	FU *fu;
	PR *pr;
	int cnt;
	u_char *bp;
	off_t saveaddress;
	u_char savech=0, *savebp;

	while ((bp = get()))
	    for (fs = fshead, savebp = bp, saveaddress = address; fs;
		fs = fs->nextfs, bp = savebp, address = saveaddress)
		    for (fu = fs->nextfu; fu; fu = fu->nextfu) {
   
			if (fu->flags&F_IGNORE)
				break;
			for (cnt = fu->reps; cnt; --cnt)
			    for (pr = fu->nextpr; pr; address += pr->bcnt,
				bp += pr->bcnt, pr = pr->nextpr) {
   
				    if (eaddress && address >= eaddress &&
					!(pr->flags & (F_TEXT|F_BPAD)))
					    bpad(pr);
				    if (cnt == 1 && pr->nospace) {
   
					savech = *pr->nospace;
					*pr->nospace = '\0';
				    }
				    print(pr, bp);
				    if (cnt == 1 && pr->nospace)
					*pr->nospace = savech;
			    }
		    }
	if (endfu) {
   
		/*
		 * If eaddress not set, error or file size was multiple of
		 * blocksize, and no partial block ever found.
		 */
		if (!eaddress) {
   
			if (!address) {
   
				return;
			}
			eaddress = address;
		}
		for (pr = endfu->nextpr; pr; pr = pr->nextpr)
			switch(pr->flags) {
   
			case F_ADDRESS:
				(void)printf(pr->fmt, (quad_t)eaddress);
				break;
			case F_TEXT:
				(void)printf("%s", pr->fmt);
				break;
			default:
				break;
			}
	}
}

static __inline void
print(PR *pr, u_char *bp)
{
   
	long double ldbl;
	   double f8;
	    float f4;
	  int16_t s2;
	   int8_t s8;
	  int32_t s4;
	u_int16_t u2;
	u_int32_t u4;
	u_int64_t u8;

	switch(pr->flags) {
   
	case F_ADDRESS:
		(void)printf(pr->fmt, (quad_t)address);
		break;
	case F_BPAD:
		(void)printf(pr->fmt, "");
		break;
	case F_C:
		conv_c(pr, bp, eaddress ? eaddress - address :
		    blocksize - address % blocksize);
		break;
	case F_CHAR:
		(void)printf(pr->fmt, *bp);
		break;
	case F_DBL:
		switch(pr->bcnt) {
   
		case 4:
			bcopy(bp, &f4, sizeof(f4));
			(void)printf(pr->fmt, f4);
			break;
		case 8:
			bcopy(bp, &f8, sizeof(f8));
			(void)printf(pr->fmt, f8);
			break;
		default:
			if (pr->bcnt == sizeof(long double)) {
   
				bcopy(bp, &ldbl, sizeof(ldbl));
				(void)printf(pr->fmt, ldbl);
			}
			break;
		}
		break;
	case F_INT:
		switch(pr->bcnt) {
   
		case 1:
			(void)printf(pr->fmt, (quad_t)(signed char)*bp);
			break;
		case 2:
			bcopy(bp, &s2, sizeof(s2));
			(void)printf(pr->fmt, (quad_t)s2);
			break;
		case 4:
			bcopy(bp, &s4, sizeof(s4));
			(void)printf(pr->fmt, (quad_t)s4);
			break;
		case 8:
			bcopy(bp, &s8, sizeof(s8));
			(void)printf(pr->fmt, s8);
			break;
		}
		break;
	case F_P:
		(void)printf(pr->fmt, isprint(*bp) && isascii(*bp) ? *bp : '.');
		break;
	case F_STR:
		(void)printf(pr->fmt, (char *)bp);
		break;
	case F_TEXT:
		(void)printf("%s", pr->fmt);
		break;
	case F_U:
		conv_u(pr, bp);
		break;
	case F_UINT:
		switch(pr->bcnt) {
   
		case 1:
			(void)printf(pr->fmt, (u_quad_t)*bp);
			break;
		case 2:
			bcopy(bp, &u2, sizeof(u2));
			(void)printf(pr->fmt, (u_quad_t)u2);