[patch libiberty include]: Add additional helper functions for directory-separator searching

[Pedro Alves]

On Wednesday 09 March 2011 12:35:00, Eli Zaretskii wrote:
> > I meant a valid use case in the code bases.
> 
> Sorry for my misunderstanding.

NP.

> 
> > Might as well cook up a (gdb) patch.  Find it pasted below.  Does it
> > look good to you?
> 
> Yes, looks fine.  Thanks.

Thanks.  I've applied it.

> > The one's left are: 1 in a linux-native only file (never cares
> > for other filesystem semantics), and a couple in the coff and
> > mdebug readers.  The latter could be rewritten in terms of
> > lbasename, but I'm not sure whether gcc outputs a literal '/' in
> > that case even when building on mingw.  If so, and we changed them,
> > we'd be breaking reading these files on Windows
> 
> Sorry, I don't understand how would that break on Windows.  Could you
> elaborate?  And what "couple of coff and mdebug readers" did you have
> in mind?

Sorry, in the hurry, I had a (another) brain cramp.  Wouldn't break.
Still it'd be useless to change this _if_ gcc hardcodes '/'.  Dunno
whether it does.

>find . -name "*.c" | xargs grep strrchr | grep "'/'"
./linux-thread-db.c:    cp = strrchr (path, '/');
./mdebugread.c:               p = strrchr (namestring, '/');
./dbxread.c:        p = strrchr (namestring, '/');

Both look like this:

	    /* Some compilers (including gcc) emit a pair of initial N_SOs.
	       The first one is a directory name; the second the file name.
	       If pst exists, is empty, and has a filename ending in '/',
	       we assume the previous N_SO was a directory name.  */

	    p = strrchr (namestring, '/');
	    if (p && *(p + 1) == '\000')
	      {
		/* Save the directory name SOs locally, then save it into
		   the psymtab when it's created below.  */
	        dirname_nso = namestring;
	        continue;		
	      }

-- 
Pedro Alves