libbb: fix parsing of "10101010" date/time form

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/libbb/time.c b/libbb/time.c
index ea2f72e3b022b1b78bc93001d1635158adc25c4e..aa19a47d46bcefc0925bae7ab4e8912daaca55b0 100644 (file)
--- a/libbb/time.c
+++ b/libbb/time.c
@@ -68,15 +68,23 @@ void FAST_FUNC parse_datestr(const char *date_str, struct tm *ptm)
                        /* else end != NUL and we error out */
                }
        } else
-       /* yyyy-mm-dd HH */
-       if (sscanf(date_str, "%u-%u-%u %u%c", &ptm->tm_year,
+       if (strchr(date_str, '-')
+           /* Why strchr('-') check?
+            * sscanf below will trash ptm->tm_year, this breaks
+            * if parse_str is "10101010" (iow, "MMddhhmm" form)
+            * because we destroy year. Do these sscanf
+            * only if we saw a dash in parse_str.
+            */
+               /* yyyy-mm-dd HH */
+        && (sscanf(date_str, "%u-%u-%u %u%c", &ptm->tm_year,
                                &ptm->tm_mon, &ptm->tm_mday,
                                &ptm->tm_hour,
                                &end) >= 4
-       /* yyyy-mm-dd */
-        || sscanf(date_str, "%u-%u-%u%c", &ptm->tm_year,
+               /* yyyy-mm-dd */
+            || sscanf(date_str, "%u-%u-%u%c", &ptm->tm_year,
                                &ptm->tm_mon, &ptm->tm_mday,
                                &end) >= 3
+           )
        ) {
                ptm->tm_year -= 1900; /* Adjust years */
                ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */