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ls.c revision 1.1 
      1 /*
      2  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *	@(#)ls.c	7.9 (Berkeley) 6/28/90
     34  */
     35 
     36 #include "sys/param.h"
     37 #include "ufs/dir.h"
     38 #include "saio.h"
     39 #include "sys/ttychars.h"
     40 
     41 main()
     42 {
     43 	struct dinode *ip;
     44 	int fd;
     45 
     46 	for (;;) {
     47 		if ((fd = getfile("ls", 0)) == -1)
     48 			exit();
     49 		ip = &iob[fd - 3].i_ino;
     50 		if ((ip->di_mode & IFMT) != IFDIR) {
     51 			printf("ls: not a directory\n");
     52 			continue;
     53 		}
     54 		if (ip->di_size == 0) {
     55 			printf("ls: zero length directory\n");
     56 			continue;
     57 		}
     58 		ls(fd);
     59 	}
     60 }
     61 
     62 #define CTRL(x)	(x&037)
     63 
     64 getfile(prompt, mode)
     65 	char *prompt;
     66 	int mode;
     67 {
     68 	int fd;
     69 	char buf[100];
     70 
     71 	do {
     72 		printf("%s: ", prompt);
     73 		gets(buf);
     74 		if (buf[0] == CTRL('d') && buf[1] == 0)
     75 			return (-1);
     76 	} while ((fd = open(buf, mode)) <= 0);
     77 	return(fd);
     78 }
     79 
     80 typedef struct direct	DP;
     81 static
     82 ls(fd)
     83 	register int fd;
     84 {
     85 	register int size;
     86 	register char *dp;
     87 	char dirbuf[DIRBLKSIZ];
     88 
     89 	printf("\ninode\tname\n");
     90 	while ((size = read(fd, dirbuf, DIRBLKSIZ)) == DIRBLKSIZ)
     91 		for(dp = dirbuf; (dp < (dirbuf + size)) &&
     92 		    (dp + ((DP *)dp)->d_reclen) < (dirbuf + size);
     93 		    dp += ((DP *)dp)->d_reclen) {
     94 			if (((DP *)dp)->d_ino == 0)
     95 				continue;
     96 			if (((DP *)dp)->d_namlen > MAXNAMLEN+1) {
     97 				printf("Corrupt file name length!  Run fsck soon!\n");
     98 				return;
     99 			}
    100 			printf("%d\t%s\n", ((DP *)dp)->d_ino,
    101 			    ((DP *)dp)->d_name);
    102 		}
    103 }
    104