[PATCH] fix(libc): Fix handle of %E & %O modifiers at end of format string

[Brian Inglis]

On 2023-11-09 12:04, Pedro Luis Castedo Cepeda wrote:
> - Prevent strftime to parsing format string beyond its end when
>    it finish with "%E" or "%O".
> ---
>   newlib/libc/time/strftime.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/newlib/libc/time/strftime.c b/newlib/libc/time/strftime.c
> index 56f227c5f..c4e9e45a9 100644
> --- a/newlib/libc/time/strftime.c
> +++ b/newlib/libc/time/strftime.c
> @@ -754,6 +754,8 @@ __strftime (CHAR *s, size_t maxsize, const CHAR *format,
>   
>         switch (*format)
>   	{
> +	case CQ('\0'):
> +	  break;
>   	case CQ('a'):
>   	  _ctloc (wday[tim_p->tm_wday]);
>   	  for (i = 0; i < ctloclen; i++)

These cases appear to already be taken care of by setting and using (depending 
on the config parameters) the "alt" variable for those modifiers, and the 
default: return 0; for the format *character* (possibly wide) not matching 
following any modifiers.

Patches to newlib should go to the newlib mailing list at sourceware dot org.

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer     but when there is no more to cut
                                 -- Antoine de Saint-Exupéry