1 files changed, 74 insertions, 0 deletions
diff --git a/time/tst-strftime.c b/time/tst-strftime.c
new file mode 100644
index 0000000000..1feb741793
--- /dev/null
+++ b/time/tst-strftime.c
@@ -0,0 +1,74 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+
+static struct
+{
+  const char *fmt;
+  size_t min;
+  size_t max;
+} tests[] =
+  {
+    { "%2000Y", 2000, 4000 },
+    { "%02000Y", 2000, 4000 },
+    { "%_2000Y", 2000, 4000 },
+    { "%-2000Y", 2000, 4000 },
+  };
+#define ntests (sizeof (tests) / sizeof (tests[0]))
+
+
+static int
+do_test (void)
+{
+  size_t cnt;
+  int result = 0;
+
+  time_t tnow = time (NULL);
+  struct tm *now = localtime (&tnow);
+
+  for (cnt = 0; cnt < ntests; ++cnt)
+    {
+      size_t size = 0;
+      int res;
+      char *buf = NULL;
+
+      do
+	{
+	  size += 500;
+	  buf = (char *) realloc (buf, size);
+	  if (buf == NULL)
+	    {
+	      puts ("out of memory");
+	      exit (1);
+	    }
+
+	  res = strftime (buf, size, tests[cnt].fmt, now);
+	  if (res != 0)
+	    break;
+	}
+      while (size < tests[cnt].max);
+
+      if (res == 0)
+	{
+	  printf ("%Zu: %s: res == 0 despite size == %Zu\n",
+		  cnt, tests[cnt].fmt, size);
+	  result = 1;
+	}
+      else if (size < tests[cnt].min)
+	{
+	  printf ("%Zu: %s: size == %Zu was enough\n",
+		  cnt, tests[cnt].fmt, size);
+	  result = 1;
+	}
+      else
+	printf ("%Zu: %s: size == %Zu: OK\n", cnt, tests[cnt].fmt, size);
+
+      free (buf);
+    }
+
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"