Hello!
On Tue, Oct 09, 2007 at 02:40:35PM +0200, Ahmed S. Darwish wrote:
> On Tue, Oct 09, 2007 at 01:55:42AM +0400, Dmitri Vorobiev wrote:
> > The patch below contains a small code clean-up for the NTFS driver: all
> > static char pointers to error message strings have been replaced by
> > static char arrays.
char * a = "a"; // pointer and content can be changed
const char * b = "b"; // the thing pointed to is const
char * const c = "c"; // the pointer is const
const char * const d = "d"; // pointer and content can't be changed
void foo(void) {
*a = 'A';
a++;
*b = 'B'; // error: assignment of read-only location
b++;
*c = 'C';
c++; // error: increment of read-only variable 'c'
*d = 'D'; // error: assignment of read-only location
d++; // error: increment of read-only variable 'd'
}
> Isn't the only difference between char *c = "msg" and char c[] = "msg" is
> that the first is a non-const pointer to a const char array while the second
> is a modifiable char array ?
$ cat [ab].c
const char *a = "a";
const char b[] = "b";
$ gcc -c [ab].c
$ size [ab].o
text data bss dec hex filename
2 4 0 6 6 a.o
2 0 0 2 2 b.o
'a' has two entries: one for the named read-writeable pointer, and one for the
anonymous read-only string, the pointer points to.
'b' has a single entry: just the named read-only string.
BYtE
Philipp
--
/ / (_)__ __ ____ __ Philipp Hahn
/ /__/ / _ \/ // /\ \/ /
/____/_/_//_/\_,_/ /_/\_\ [email protected]
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