- const char *const a_wkday = _NL_CURRENT (LC_TIME, ABDAY_1 + tp->tm_wday);
- const char *const f_wkday = _NL_CURRENT (LC_TIME, DAY_1 + tp->tm_wday);
- const char *const a_month = _NL_CURRENT (LC_TIME, ABMON_1 + tp->tm_mon);
- const char *const f_month = _NL_CURRENT (LC_TIME, MON_1 + tp->tm_mon);
- const char *const ampm = _NL_CURRENT (LC_TIME,
- hour12 > 11 ? PM_STR : AM_STR);
- size_t aw_len = strlen (a_wkday);
- size_t am_len = strlen (a_month);
- size_t ap_len = strlen (ampm);
+ /* We cannot make the following values variables since we must delay
+ the evaluation of these values until really needed since some
+ expressions might not be valid in every situation. The `struct tm'
+ might be generated by a strptime() call that initialized
+ only a few elements. Dereference the pointers only if the format
+ requires this. Then it is ok to fail if the pointers are invalid. */
+# define a_wkday _NL_CURRENT (LC_TIME, ABDAY_1 + tp->tm_wday)
+# define f_wkday _NL_CURRENT (LC_TIME, DAY_1 + tp->tm_wday)
+# define a_month _NL_CURRENT (LC_TIME, ABMON_1 + tp->tm_mon)
+# define f_month _NL_CURRENT (LC_TIME, MON_1 + tp->tm_mon)
+# define ampm _NL_CURRENT (LC_TIME, tp->tm_hour > 11 ? PM_STR : AM_STR)
+
+# define aw_len strlen (a_wkday)
+# define am_len strlen (a_month)
+# define ap_len strlen (ampm)