[PATCH] Update to %Z fix

[Stanley Lancaster <lancasterharp@gmail.com>]

---
 time/strptime_l.c   | 16 +++++++++++-----
 time/tst-strptime.c |  2 ++
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/time/strptime_l.c b/time/strptime_l.c
index 85c3249fcc..2382defc92 100644
--- a/time/strptime_l.c
+++ b/time/strptime_l.c
@@ -770,11 +770,17 @@ __strptime_internal (const char *rp, const char *fmt, struct tm *tmp,
 	  break;
 	case 'Z':
 	  /* Read timezone but perform no conversion.  */
-	  while (ISSPACE (*rp))
-	    rp++;
-	  while (!ISSPACE (*rp) && *rp != '\0')
-	    rp++;
-	  break;
+		{
+			while (ISSPACE (*rp))
+	    	rp++;
+			/* Read timezone but perform no conversion.  */
+			/* we recognize the format [-+a-zA-Z0-9]{3,} */
+			const char* start_rp = rp;
+			while ((*rp >= 'A' && *rp <= 'Z') || (*rp >= 'a' && *rp <= 'z') || (*rp >= '0' && *rp <= '9'))
+				rp++;
+			if (start_rp+3 < rp)
+				return NULL;
+		}
 	case 'z':
 	  /* We recognize four formats:
 	     1. Two digits specify hours.
diff --git a/time/tst-strptime.c b/time/tst-strptime.c
index 3dae9e0594..40145cb109 100644
--- a/time/tst-strptime.c
+++ b/time/tst-strptime.c
@@ -48,6 +48,8 @@ static const struct
     6, 0, 0, 1 },
   { "en_US.ISO-8859-1", "2000-01-01 08:12:21 PM", "%Y-%m-%d %I:%M:%S %p",
     6, 0, 0, 1 },
+  { "en_US.ISO-8859-1", "2000-01-01 08:12:21 AM CST/", "%Y-%m-%d %I:%M:%S %p %Z/", 
+    6, 0, 0, 1},
   { "ja_JP.EUC-JP", "2001 20 \xb7\xee", "%Y %U %a", 1, 140, 4, 21 },
   { "ja_JP.EUC-JP", "2001 21 \xb7\xee", "%Y %W %a", 1, 140, 4, 21 },
   /* Most of the languages do not need the declension of the month names
-- 
2.39.3