ls.c

早期freebsd实现

/*
 * Copyright (c) 1982, 1986, 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.
 *
 *	@(#)ls.c	8.1 (Berkeley) 6/11/93
 */

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

#include <ufs/ufs/dir.h>
#include <stand.att/saio.h>

main()
{
	struct dinode *ip;
	int fd;

	for (;;) {
		if ((fd = getfile("ls", 0)) == -1)
			exit();
		ip = &iob[fd - 3].i_ino;
		if ((ip->di_mode & IFMT) != IFDIR) {
			printf("ls: not a directory\n");
			continue;
		}
		if (ip->di_size == 0) {
			printf("ls: zero length directory\n");
			continue;
		}
		ls(fd);
	}
}

#define CTRL(x)	(x&037)

getfile(prompt, mode)
	char *prompt;
	int mode;
{
	int fd;
	char buf[100];

	do {
		printf("%s: ", prompt);
		gets(buf);
		if (buf[0] == CTRL('d') && buf[1] == 0)
			return (-1);
	} while ((fd = open(buf, mode)) <= 0);
	return(fd);
}

typedef struct direct	DP;
static
ls(fd)
	register int fd;
{
	register int size;
	register char *dp;
	char dirbuf[DIRBLKSIZ];

	printf("\ninode\tname\n");
	while ((size = read(fd, dirbuf, DIRBLKSIZ)) == DIRBLKSIZ)
		for(dp = dirbuf; (dp < (dirbuf + size)) &&
		    (dp + ((DP *)dp)->d_reclen) < (dirbuf + size);
		    dp += ((DP *)dp)->d_reclen) {
			if (((DP *)dp)->d_ino == 0)
				continue;
			if (((DP *)dp)->d_namlen > MAXNAMLEN+1) {
				printf("Corrupt file name length!  Run fsck soon!\n");
				return;
			}
			printf("%d\t%s\n", ((DP *)dp)->d_ino,
			    ((DP *)dp)->d_name);
		}
}