[RFA] source.c:find_and_open_source cleanup

[Doug Evans]

Presumably this is just leftovers from the mstrsave removal.  The code
was originally something like:

  if (result >= 0)
    {
      char *tmp_fullname;
      tmp_fullname = *fullname;
      *fullname = mstrsave (objfile->md, *fullname);
      xfree (tmp_fullname);
    }


On Mon, Apr 7, 2008 at 12:34 PM, Doug Evans <dje@google.com> wrote:
> This is odd:
>
>   if (result >= 0)
>     {
>       char *tmp_fullname;
>       tmp_fullname = *fullname;
>       *fullname = xstrdup (tmp_fullname);
>       xfree (tmp_fullname);
>     }
>
>  Is there something subtle going on here?
>  I thought maybe the caller might be expecting a newly allocated value
>  if it passed in a value for `fullname', but the previous value has
>  already been freed at this point.
>
>  2008-04-07  Doug Evans  <dje@google.com>
>
>         * source.c (find_and_open_source): Add some comments clarifying
>         handling of FULLNAME argument.  Make static.  Remove pointless
>         xstrdup/xfree.
>
>  Index: source.c
>  ===================================================================
>  RCS file: /cvs/src/src/gdb/source.c,v
>  retrieving revision 1.86
>  diff -u -p -u -p -r1.86 source.c
>  --- source.c    14 Mar 2008 18:39:43 -0000      1.86
>  +++ source.c    7 Apr 2008 19:30:01 -0000
>  @@ -927,15 +927,19 @@ rewrite_source_path (const char *path)
>     DIRNAME is the compilation directory of a particular source file.
>             Only some debug formats provide this info.
>     FULLNAME can be the last known absolute path to the file in question.
>  +     Space for the path must have been malloc'd.  If a path substitution
>  +     is applied we free the old value and set a new one.
>
>     On Success
>       A valid file descriptor is returned. ( the return value is positive )
>       FULLNAME is set to the absolute path to the file just opened.
>  +     The caller is responsible for freeing FULLNAME.
>
>     On Failure
>       An invalid file descriptor is returned. ( the return value is negative )
>       FULLNAME is set to NULL.  */
>  -int
>  +
>  +static int
>   find_and_open_source (struct objfile *objfile,
>                       const char *filename,
>                       const char *dirname,
>  @@ -1022,13 +1026,6 @@ find_and_open_source (struct objfile *ob
>         result = openp (path, OPF_SEARCH_IN_PATH, p, OPEN_MODE, 0, fullname);
>      }
>
>  -  if (result >= 0)
>  -    {
>  -      char *tmp_fullname;
>  -      tmp_fullname = *fullname;
>  -      *fullname = xstrdup (tmp_fullname);
>  -      xfree (tmp_fullname);
>  -    }
>    return result;
>   }
>
>