RE: Porting git to HP NonStop

> From: Brandon Casey [mailto:drafnel@gmail.com]
> Sent: Wednesday, August 22, 2012 7:23 PM
> To: Joachim Schmitz
> Cc: Junio C Hamano; Shawn Pearce; git@vger.kernel.org;
> rsbecker@nexbridge.com
> Subject: Re: Porting git to HP NonStop
> 
> On Wed, Aug 22, 2012 at 10:18 AM, Joachim Schmitz <jojo@schmitz-digital.de>
> wrote:
> >> From: Brandon Casey [mailto:drafnel@gmail.com]
> >> Sent: Wednesday, August 22, 2012 7:01 PM
> >> To: Joachim Schmitz
> >> Cc: Junio C Hamano; Shawn Pearce; git@vger.kernel.org;
> >> rsbecker@nexbridge.com
> >> Subject: Re: Porting git to HP NonStop
> >>
> >> On Wed, Aug 22, 2012 at 9:30 AM, Joachim Schmitz
> >> <jojo@schmitz-digital.de>
> >> wrote:
> >>
> >> > OK, so how about this:
> >> > /usr/local/bin/diff -EBbu ./compat/mkdir.c.orig ./compat/mkdir.c
> >> > --- ./compat/mkdir.c.orig       2012-08-21 05:02:11 -0500
> >> > +++ ./compat/mkdir.c    2012-08-21 05:02:11 -0500
> >> > @@ -0,0 +1,24 @@
> >> > +#include "../git-compat-util.h"
> >> > +#undef mkdir
> >> > +
> >> > +/* for platforms that can't deal with a trailing '/' */ int
> >> > +compat_mkdir_wo_trailing_slash(const char *dir, mode_t mode) {
> >> > +       int retval;
> >> > +       char *tmp_dir = NULL;
> >> > +       size_t len = strlen(dir);
> >> > +
> >> > +       if (len && dir[len-1] == '/') {
> >> > +               if ((tmp_dir = strdup(dir)) == NULL)
> >> > +                       return -1;
> >> > +               tmp_dir[len-1] = '\0';
> >> > +       }
> >> > +       else
> >> > +               tmp_dir = (char *)dir;
> >> > +
> >> > +       retval = mkdir(tmp_dir, mode);
> >> > +       if (tmp_dir != dir)
> >> > +               free(tmp_dir);
> >> > +
> >> > +       return retval;
> >> > +}
> >>
> >> Why not rearrange this so that you assign to dir the value of tmp_dir
> >> and then just pass dir to mkdir.  Then you can avoid the recast of
> >> dir to (char*) in the else branch.  Later, just call free(tmp_dir).
> >> Also, we have xstrndup.  So I think the body of your function can become
> something like:
> >>
> >>    if (len && dir[len-1] == '/')
> >>        dir = tmp_dir = xstrndup(dir, len-1);
> >
> > xstndup() can't fail?
> 
> Correct.  It will either succeed or die.  It will also try to free up some memory
> used by git if possible.