usr/src/sys/stand.att/ls.c

/*
 * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *      @(#)ls.c        7.4 (Berkeley) %G%
 */

#include "param.h"
#include "inode.h"
#include "dir.h"
#include "fs.h"
#include "saio.h"

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

        fd = getfile("ls", 0);
        ip = &iob[fd - 3].i_ino;
        if ((ip->i_mode & IFMT) != IFDIR)
                _stop("ls: not a directory");
        if (ip->i_size == 0)
                _stop("ls: zero length directory");
        ls(fd);
}

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

        printf("\nname->inode\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_reclen > DIRSIZ(((DP *)dp)))
                                continue;
                        if (((DP *)dp)->d_namlen > MAXNAMLEN+1)
                                _stop("Corrupt file name length!  Run fsck soon!\n");
                        printf("%s->%d\n", ((DP *)dp)->d_name,
                            ((DP *)dp)->d_ino);
                }
}