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Re: [To CVS-Dev] CVS Directory Order and

From: Eric Siegerman
Subject: Re: [To CVS-Dev] CVS Directory Order and
Date: Thu, 25 Jan 2001 18:36:45 -0500
User-agent: Mutt/1.2.5i

On Thu, Jan 25, 2001 at 05:23:37PM -0500, Larry Jones wrote:
> > > 2) It seems that quite often the order that files are processed is 
> > > different on
> > > MVS.  For example, in basicb-7, the output that is expected is:
> > >  'T Emptydir/sfile1
> > > T sdir2/sfile2'
> > >
> > > but on MVS it's:
> > > 'T sdir2/sfile2
> > > T Emptydir/sfile1'
> > >
> > > I am assuming that the change is due to a different collating sequence 
> > > between
> > > ASCII and EBCDIC.  My question is, shouldn't LC_COLLATE=C fix this?  I 
> > > looked in
> > > the opendir/readdir function descriptions on several different UNIX 
> > > (UNII?) and
> > > LINUX docs and none mention the order that these files/directories should 
> > > be
> > > listed, nor use of LC_COLLATE.
> In general, readdir() returns entries in whatever order they are
> physically stored in the directory, it does no sorting of any kind. 


> (In the case of basicb-7, for example, I think the
> subdirectories should be processed in the order they occur in
> CVS/Entries, which should be the order they were added in.)

Nope; CVS does them in alphabetical order (as it seems to do just
about everything except "import").  Tested by creating and "cvs
add"ing subdirectories in non-alphabetical order, hand-editing
CVS/Entries into a different non-alphabetical order, then doing
"cvs tag foo".

But CVS doesn't seem to do locale-based sorting.  It uses
strcmp(), which just does a byte-for-byte numeric comparison.
This would explain the reported output; in EBCDIC, lower-case
letters do indeed sort before caps ('a' is 0x81; 'A' is 0xC1).  A
quick grep for "sort" in the CVS 1.11 sources turns up at least
three functions that need changing:

Solaris provides strcoll() and strxfrm() to do locale-based
string comparisons, but I have no idea how standard they are.


|  | /\
|-_|/  >   Eric Siegerman, Toronto, Ont.        address@hidden
|  |  /
Interviewer: You've been looking at the stars all your life:
Is there anything in astrology?
Arthur C. Clarke: It's utter nonsense.  But I'm a Sagittarius,
so I'm naturally skeptical.

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