[aclug-L] Re: C questions

[Olwe Bottorff <galanolwe@xxxxxxxxx>]

Yes, that's true and once you take 755 to decimal you
can give it to a mode_t variable, then feed it to
open, mkdir, etc. But I guess I'm still wondering how

mkdir("dirname", 0755);

gets converted.

The issue is I'm writing my own tar utility. The mtime
gets stored as an 11-digit char string that's supposed
to be an octal number, so you have to turn it back
into a decimal. I had to do an atoll() on the 11-digit
char string, assigning to a long long variable, then
convert that from octal to decimal to get the utime's
time_t variable fed properly. That can't be the most
elegant way to do this....

LB

--- Jonathan Hall <flimzy@xxxxxxxxxx> wrote:

> Permissions are represented in octal.  0755 is octal
> for 493.  Certianly
> you can assign the value to a numeric variable, and
> pass that to the
> mkdir() function.
> 
> 
> 
> > I'm trying to create a directory in C where I use
> >
> > mkdir(const char *pathname, mode_t mode);
> >
> > I'd like to take a simple string "0775" and
> somehow
> > use that for the mode argument. I'm getting the
> > permissions as a char string from a file. Now, if
> you
> > do this:
> >
> > mkdir ("mydir", 0755); /* 0755 directly typed in
> */
> >
> > It works fine. But I can't figure out how to get a
> > variable (char or otherwise) with 0755 in it that
> > mkdir will accept. Of course I could parse each
> letter
> > and build the variable, but that just isn't very
> > elegant.
> >
> > I'm also trying this for utime(), i.e., trying to
> feed
> > the utimbuf argument to utime from a string I'm
> > getting from a file.
> >
> >
> > LB
> >
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