Re: [patch] less: trailing space

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02-22-2008, 12:28 PM

Kenneth R Westerback

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Re: [patch] less: trailing space

On Mon, May 22, 2006 at 12:49:46PM +0930, Matthew Haub wrote:
> On Sun, May 21, 2006 at 11:04:14PM +0930, Matthew Haub wrote:
> > Index: src/usr.bin/less/filename.c
> > ================================================== =================
> > RCS file: /cvs/src/usr.bin/less/filename.c,v
> > retrieving revision 1.10
> > diff -u -r1.10 filename.c
> > --- src/usr.bin/less/filename.c 2004/08/23 17:56:20 1.10
> > +++ src/usr.bin/less/filename.c 2006/05/21 13:21:15
> > @@ -676,7 +676,7 @@
> > /*
> > * Overwrite the final trailing space with a null terminator.
> > */
> > - *--p = '\0';
> > + gfilename[strlen(gfilename) - 1] = '\0';
> > GLOB_LIST_DONE(list);
> > }
> > #else
>
> Hi,
>
> dlg@ says explanations are important, even for one-liners

>
> lglob() returns gfilename, which has an extra space on the end, this is
> what we really want to overwrite with a null character. This'll stop
> less from appending a trailing space to the filename you log to.
>
> Removing the *--p will stop less from segfaulting when cycling through
> auto-complete entries. Here p points to the first character of the last
> entry in the auto-complete list. There's no reason to set the character
> before it to null, it may not be allocated memory. The macro
> GLOB_LIST_DONE calls globfree() which frees any space associated with
> the list anyhow.
>

With that explanation, looks ok to me. :-).

..... Ken

> ========================
> Example 1, segfault:
> ========================
>
> $ mkdir mess
> $ cd mess
> $ touch file
> $ mkdir directory
> $ ls -1F
> directory/
> file
> $ echo hi | less
>
> now type :e./<tab><tab><tab>
>
> hi
> Examine: ./fileSegmentation fault (core dumped)
> $
>
> ========================
> Example 2, trailing space
> ========================
>
> $ echo hi | less
>
> now type sout<enter>q
>
> $ ls -1F
> directory/
> file
> out
> $ ls out
> ls: out: No such file or directory
> $ ls out\
> out
> $

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Re: [patch] less: trailing space