On Tue, Aug 26, 2008 at 05:17:02PM +0100, Samuel Thibault wrote:
> mini-os: make xenbus_read_integer and xenbus_printf take const strings
>
> Signed-off-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>
>
> diff -r c2472ded5c7c extras/mini-os/include/xenbus.h
> --- a/extras/mini-os/include/xenbus.h Tue Aug 26 15:16:57 2008 +0100
> +++ b/extras/mini-os/include/xenbus.h Tue Aug 26 17:06:09 2008 +0100
> @@ -83,12 +83,12 @@ char *xenbus_transaction_end(xenbus_tran
> int *retry);
>
> /* Read path and parse it as an integer. Returns -1 on error. */
> -int xenbus_read_integer(char *path);
> +int xenbus_read_integer(const char *path);
>
> /* Contraction of snprintf and xenbus_write(path/node). */
> char* xenbus_printf(xenbus_transaction_t xbt,
> - char* node, char* path,
> - char* fmt, ...);
> + const char* node, const char* path,
> + const char* fmt, ...);
If you annotate that declaration with
__attribute__ ((__format__ (printf, 4, 3)))
then gcc will warn you any time a caller gives incorrect args vs
format string, which can catch some otherwise hidden bugs.
Regards,
Daniel
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