Re: [PATCH 1/5] Introduce build_debug_file_name

[Eli Zaretskii <eliz@gnu.org>]

> From: Gary Benson <gbenson@redhat.com>
> Cc: Cédric Buissart <cedric.buissart@gmail.com>
> Date: Tue, 16 Jun 2015 10:42:44 +0100
> 
> +/* Build the filename of a separate debug file from an arbitrary
> +   number of components.  Returns an xmalloc'd string that must
> +   be be freed by the caller.  The final argument of this function
> +   must be NULL to mark the end the argument list.  */
> +
> +static char *
> +build_debug_file_name (const char *first, ...)
> +{
> +  va_list ap;
> +  const char *arg, *last;
> +  VEC (char_ptr) *args = NULL;
> +  struct cleanup *back_to = make_cleanup_free_char_ptr_vec (args);
> +  int bufsiz = 0;
> +  char *buf, *tmp;
> +  int i;
> +
> +  va_start (ap, first);
> +  for (arg = first; arg; arg = va_arg (ap, const char *))
> +    last = arg;
> +  va_end (ap);
> +
> +  va_start (ap, first);
> +  for (arg = first; arg; arg = va_arg (ap, const char *))
> +    {
> +      if (arg == last)
> +	tmp = xstrdup (arg);
> +      else
> +	{
> +	  int len;
> +
> +	  /* Strip leading separators from subdirectories.  */
> +	  if (arg != first)
> +	    {
> +	      while (*arg != '\0' && IS_DIR_SEPARATOR (*arg))
> +		arg++;
> +	    }
> +
> +	  /* Strip trailing separators.  */
> +	  len = strlen (arg);
> +
> +	  while (len > 0 && IS_DIR_SEPARATOR (arg[len - 1]))
> +	    len--;

Was this logic tested with Windows-style "d:/foo" file names?  E.g.,
what will happen if the first component is "d:/"?

Thanks.