[TUHS] (no subject)

[kstailey@yahoo.com (Kenneth Stailey)]

--- Dennis Ritchie <dmr at plan9.bell-labs.com> wrote:
>  > The V7 ls(1) man page says that the -s option, which prints total
>  >blocks, includes any indirect blocks.
> 
>  >However, the V7 struct stat didn't have the st_blocks member in the
>  > struct stat, and the code in ls.c uses
> 
>  > 	long
>  >	nblock(size)
>  >	long size;
>  >	{
>  >		return((size+511)>>9);
>  >	}
> 
>  >So, is this just a case of the man page being mistaken?
> 
> Yes, it looks like a manual bug. Retrieving
> the true number of indirect blocks isn't possible
> from the 7th edition stat.  I'm not sure when (or by
> whom) the st_blocks member was added.
> 
>  > While I'm at it, the V7 ls -a option only adds . and .. to the
>  > list; apparently all other dot files were printed by default.
>  > When did ls change such that -a applied to all dot files?
> 
> UCB or USL did this (I'm sure which first).
> Both tended to use more . files.
> 
> 	Dennis
> _______________________________________________
> TUHS mailing list
> TUHS at minnie.tuhs.org
> http://minnie.tuhs.org/mailman/listinfo/tuhs

1BSD ls.c has:

        for(;;) {
                p = &dentry;
                for (j=0; j<16; j++)
                        *p++ = getc(&inf);
                if (dentry.dinode==0
                 || aflg==0 && dentry.dname[0]=='.')
                        continue;
                if (dentry.dinode == -1)
                        break;
                ep = gstat(makename(dir, dentry.dname), 0);
                if (ep->lnum != -1)
                        ep->lnum = dentry.dinode;
                for (j=0; j<14; j++)
                        ep->lname[j] = dentry.dname[j];
        }

so it skips all that start with "." unless aflg is set from invoking ls with
-a.

I got it from the 1BSD tape that is on the CSRG archive CD-ROM set.  I had to
port ar11 to FreeBSD/i386 to get the sources out of the cont.a files.  If
anyone wants my port of ar11 I can send it to them.

ls.c starts with this block of comments:

#
/*
 * ls - list file or directory
 *
 * Modified by Bill Joy UCB May/August 1977
 *
 * This version of ls is designed for graphic terminals and to
 * list directories with lots of files in them compactly.
 * It supports three variants for listings:
 *
 *      1) Columnar output.
 *      2) Stream output.
 *      3) Old one per line format.
 *
 * Columnar output is the default.
 * If, however, the standard output is not a teletype, the default
 * is one-per-line.
 *
 * With columnar output, the items are sorted down the columns.
 * We use columns only for a directory we are interpreting.
 * Thus, in particular, we do not use columns for
 *
 *      ls /usr/bin/p*
 *
 * This version of ls also prints non-printing characters as '?' if
 * the standard output is a teletype.
 *
 * Flags relating to these and other new features are:
 *
 *      -m      force stream output.
 *
 *      -1      force one entry per line, e.g. to a teletype
 *
 *      -q      force non-printings to be '?'s, e.g. to a file
 *
 *      -c      force columnar output, e.g. into a file
 *
 *      -n      like -l, but user/group id's in decimal rather than
 *              looking in /etc/passwd to save time
 */

It's interesting they called CRTs "graphic terminals".


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