From: nobu.nokada@...
Date: 2005-08-24T07:45:40+09:00
Subject: Re: File.extname edge case bug?

Hi,

At Wed, 24 Aug 2005 07:21:32 +0900,
Daniel Berger wrote in [ruby-core:05658]:
> 
> mathew wrote:
> 
> > I think any string which *ends* with a "." should return "". I don't 
> > think the start of the string should have anything to do with the output 
> > of extname.
> 
> Based on this, which I think is correct, I submit the following patch.  I've 
> also included a test suite and some benchmarks.  Sorry for any wrappage.

You don't consider the case no suffix but path contains a dot.

Try:
  File.extname("foo.bar/zot")


Index: file.c
===================================================================
RCS file: /cvs/ruby/src/ruby/file.c,v
retrieving revision 1.200
diff -U2 -p -r1.200 file.c
--- file.c	30 Jun 2005 06:20:08 -0000	1.200
+++ file.c	23 Aug 2005 22:39:51 -0000
@@ -2770,5 +2770,5 @@ rb_file_s_extname(klass, fname)
  
      e = strrchr(p, '.');	/* get the last dot of the last component */
-     if (!e || e == p)		/* no dot, or the only dot is first? */
+     if (!e || e == p || !e[1])	/* no dot, or the only dot is first or end? */
 	 return rb_str_new2("");
      extname = rb_str_new(e, chompdirsep(e) - e);	/* keep the dot, too! */


-- 
Nobu Nakada