Can fts_open() be constified further?
Yar Tikhiy
yar at comp.chem.msu.su
Mon May 29 02:23:55 PDT 2006
On Sun, May 28, 2006 at 08:43:28PM +0400, Yar Tikhiy wrote:
> Hi folks,
>
> Currently, fts_open() is declared as follows:
>
> FTS *
> fts_open(char * const *path_argv, int options,
> int (*compar)(const FTSENT * const *, const FTSENT * const *));
>
> This means that one cannot pass pointers to constant strings in
> path_argv[] without getting rather justified warnings from cc.
> AFAIK, fts(3) functions aren't supposed to modify the path strings.
> Hence the prototype asks to be changed slightly:
>
> fts_open(const char * const *path_argv, int options,
> ^^^^^
> This shouldn't break fts consumers because a pointer to a variable
> can be converted to a pointer to a constant w/o warnings (but not
> the other way around.) Can anybody see other possible side effects
> from such change?
I was pointed out in a private mail that the types "const FOO **"
and "FOO **" were incompatible, which would break passing "argv"
from main() to fts_open().
--
Yar
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