Re: Variable to sizeof function.

[Vikas S <vikas_soolapani@yahoo.com>]

I guess I was not clear. Say, we have two structures.

str1 {int x, char y} and str2 {int x, char *y};

printf(sizeof(struct str1)); will give proper output. ie memory occupied
by str1.

What I want is, instead of hard-coding str1 etc., I want to find
the size of structure which I will give as 1st argument. So, if the
program name is size, i'll give:
$ ./size str1 --- to get size of str1
$ ./size str2 --- to get size of str2

The code which I gave earlier is giving compile-time error message.

Thanks,
Vikas
--- Rechberger Markus <mrechberger@gmail.com> wrote:

> strlen on a null pointer will segfault...
> if arc is 1 then argv[0] will contain a pointer to an array of char
> if arc is 2 then argv[1] (the users first argument) will contain an
> array of char..
> so don't forget to check the number of arguments ..
> 
> On 7/15/05, Vadiraj <vadiraj.cs@gmail.com> wrote:
> > Vikas,
> > 
> > On 7/15/05, Vikas S <vikas_soolapani@yahoo.com> wrote:
> > > I want to find out the size of a structure which the user will give as an argument
> > > as follows.
> > >
> > > #include <>  -- All includes..
> > > ..
> > > main(int arc, char *argv[])
> > 
> >    argv is a charecter pointer . You cannot pass struct * as an
> > arguement to main.
> > 
> > > {
> > > printf("Size of structure %s is: %d\n", argv[1], sizeof(struct argv[1]));
> > 
> > use strlen(argv[1]) to find the lenght of the string.
> > 
> > --
> > cheers,
> > Vadi
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >
> -
> To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 



	
		
__________________________________ 
Do you Yahoo!? 
Yahoo! Mail - You care about security. So do we. 
http://promotions.yahoo.com/new_mail