The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/stand/ls.c

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    1 /*      $NetBSD: ls.c,v 1.16 2009/03/18 10:22:45 cegger Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 #ifndef lint
   34 __COPYRIGHT("@(#) Copyright (c) 1993\n\
   35         The Regents of the University of California.  All rights reserved.\n");
   36 #endif /* not lint */
   37 
   38 #ifndef lint
   39 #if 0
   40 static char sccsid[] = "@(#)ls.c        8.1 (Berkeley) 6/11/93";
   41 #else
   42 __RCSID("$NetBSD: ls.c,v 1.16 2009/03/18 10:22:45 cegger Exp $");
   43 #endif
   44 #endif /* not lint */
   45 
   46 #include <sys/param.h>
   47 #include <sys/stat.h>
   48 #include <sys/dirent.h>
   49 #include <ufs/ufs/dir.h>
   50 #include <ufs/ufs/dinode.h>
   51 #include <sys/ttychars.h>
   52 #include <lib/libsa/stand.h>
   53 
   54 int main(void);
   55 static void ls(int);
   56 
   57 int
   58 main(void)
   59 {
   60         struct stat st;
   61         int fd;
   62 
   63         for (;;) {
   64                 if ((fd = getfile("ls", 0)) == -1)
   65                         exit();
   66 
   67                 if (fstat(fd, &st) == -1) {
   68                         printf("ls: cannot stat\n");
   69                         continue;
   70                 }
   71 
   72                 if (!S_ISDIR(st.st_mode)) {
   73                         printf("ls: not a directory\n");
   74                         continue;
   75                 }
   76                 if (st.st_size == 0) {
   77                         printf("ls: zero length directory\n");
   78                         continue;
   79                 }
   80                 ls(fd);
   81         }
   82 }
   83 
   84 typedef struct dirent   DP;
   85 static void
   86 ls(register int fd)
   87 {
   88         register int size;
   89         register char *dp;
   90         char dirbuf[DIRBLKSIZ];
   91 
   92         printf("\ninode\tname\n");
   93         while ((size = read(fd, dirbuf, DIRBLKSIZ)) == DIRBLKSIZ)
   94                 for (dp = dirbuf; (dp < (dirbuf + size)) &&
   95                     (dp + ((DP *)dp)->d_reclen) < (dirbuf + size);
   96                     dp += ((DP *)dp)->d_reclen) {
   97                         if (((DP *)dp)->d_fileno == 0)
   98                                 continue;
   99                         if (((DP *)dp)->d_namlen > MAXNAMLEN+1) {
  100                                 printf("Corrupt file name length!  Run fsck soon!\n");
  101                                 return;
  102                         }
  103                         printf("%d\t%s\n", ((DP *)dp)->d_fileno,
  104                             ((DP *)dp)->d_name);
  105                 }
  106 }

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