Le Tue, Mar 26, 2024 at 01:58:37PM -0600, Todd C. Miller a écrit :
> On Tue, 26 Mar 2024 12:45:09 -0700, [email protected] wrote:
>
> > Someone want to craft a diff for ls to handle that (and scan the tree for
> > other unchecked localtime(<uncontrolled data>) calls)? Not sure if
> > POSIX's ls spec has an out for how to print the time for such a thing.
>
> Another option is to just use the epoch for invalid timestamps.
> POSIX doesn't appear to offer guidance in this. NetBSD prints a
> string of '?' and FreeBSD prints "bad date val".
>
> - todd
>
OK denis@
> Index: bin/ls/print.c
> ===================================================================
> RCS file: /cvs/src/bin/ls/print.c,v
> retrieving revision 1.40
> diff -u -p -u -r1.40 print.c
> --- bin/ls/print.c 7 Oct 2023 11:51:08 -0000 1.40
> +++ bin/ls/print.c 26 Mar 2024 19:54:54 -0000
> @@ -241,6 +241,7 @@ static void
> printtime(time_t ftime)
> {
> char f_date[DATELEN];
> + struct tm *tm;
> static time_t now;
> static int now_set = 0;
>
> @@ -252,9 +253,14 @@ printtime(time_t ftime)
> /*
> * convert time to string, and print
> */
> + if ((tm = localtime(&ftime)) == NULL) {
> + /* Invalid time stamp, just display the epoch. */
> + ftime = 0;
> + tm = localtime(&ftime);
> + }
> if (strftime(f_date, sizeof(f_date), f_sectime ? "%b %e %H:%M:%S %Y" :
> (ftime <= now - SIXMONTHS || ftime > now) ? "%b %e %Y" :
> - "%b %e %H:%M", localtime(&ftime)) == 0)
> + "%b %e %H:%M", tm) == 0)
> f_date[0] = '\0';
>
> printf("%s ", f_date);
>
