Revert r272122

The patch still needs to be more robust and it broke the
build on MIPS so revert it for now while all the issues
are fixed.

Reported by:	ache, davide
PR:		137307

lib/libc/stdtime/strptime.c

@@ -55,32 +55,10 @@ __FBSDID("$FreeBSD$");
 #include "un-namespace.h"
 #include "libc_private.h"
 #include "timelocal.h"
-#include "tzfile.h"
 
 static char * _strptime(const char *, const char *, struct tm *, int *, locale_t);
 
-#define	asizeof(a)	(sizeof(a) / sizeof((a)[0]))
+#define	asizeof(a)	(sizeof (a) / sizeof ((a)[0]))
-
-#define	FLAG_NONE	(1 << 0)
-#define	FLAG_YEAR	(1 << 1)
-#define	FLAG_MONTH	(1 << 2)
-#define	FLAG_YDAY	(1 << 3)
-#define	FLAG_MDAY	(1 << 4)
-#define	FLAG_WDAY	(1 << 5)
-
-/*
- * Calculate the week day of the first day of a year. Valid for
- * the Gregorian calendar, which began Sept 14, 1752 in the UK
- * and its colonies. Ref:
- * http://en.wikipedia.org/wiki/Calculating_the_day_of_the_week/
- */
-
-static int
-first_wday_of(int year)
-{
-	return (((2 * (3 - (year / 100) % 4)) + (year % 100) +
-		((year % 100) / 4) + (isleap(year) ? 6 : 0) + 1) % 7);
-}
 
 static char *
 _strptime(const char *buf, const char *fmt, struct tm *tm, int *GMTp,
@@ -88,17 +66,9 @@ _strptime(const char *buf, const char *fmt, struct tm *tm, int *GMTp,
 {
 	char	c;
 	const char *ptr;
-	int	day_offset = -1, wday_offset;
 	int	i, len;
-	int flags;
 	int Ealternative, Oalternative;
-	const struct lc_time_T *tptr = __get_current_time_locale(locale);
+	struct lc_time_T *tptr = __get_current_time_locale(locale);
-	static int start_of_month[2][13] = {
-		{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
-		{0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
-	};
-
-	flags = FLAG_NONE;
 
 	ptr = fmt;
 	while (*ptr != 0) {
@@ -149,9 +119,7 @@ label:
 			if (i < 19)
 				return (NULL);
 
-			tm->tm_year = i * 100 - TM_YEAR_BASE;
+			tm->tm_year = i * 100 - 1900;
-			flags |= FLAG_YEAR;
-
 			break;
 
 		case 'c':
@@ -229,8 +197,6 @@ label:
 				return (NULL);
 
 			tm->tm_yday = i - 1;
-			flags |= FLAG_YDAY;
-
 			break;
 
 		case 'M':
@@ -337,32 +303,7 @@ label:
 				return (NULL);
 
 			tm->tm_wday = i;
-			if (day_offset >= 0 && (i - day_offset) != 0) {
-				tm->tm_yday += i - day_offset;
-				i = 0;
-				while (tm->tm_yday >=
-					start_of_month[isleap(tm->tm_year +
-							TM_YEAR_BASE)][i])
-					i++;
-				if (i > 12)
-				{
-					i = 1;
-					tm->tm_yday -=
-						start_of_month[isleap(tm->tm_year +
-								TM_YEAR_BASE)]
-						[12];
-					tm->tm_year++;
-				}
-				tm->tm_mon = i - 1;
-				tm->tm_mday = tm->tm_yday -
-					start_of_month[isleap(tm->tm_year +
-							TM_YEAR_BASE)]
-					[i - 1] + 1;
-			}
 			buf += len;
-			flags |= FLAG_YEAR | FLAG_MONTH | FLAG_YDAY |
-				 FLAG_MDAY | FLAG_WDAY;
-
 			break;
 
 		case 'U':
@@ -372,8 +313,6 @@ label:
 			 * information present in the tm structure at this
 			 * point to calculate a real value, so just check the
 			 * range for now.
-			 * We expect that the year has already been
-			 * parsed.
 			 */
 			if (!isdigit_l((unsigned char)*buf, locale))
 				return (NULL);
@@ -388,45 +327,6 @@ label:
 			if (i > 53)
 				return (NULL);
 
-			/* Week numbers are l-origin. So that we can always
-			 * return the date of a Sunday (or Monday), treat week
-			 * 0 as week 1.
-			 */
-
-			if (i == 0)
-				i = 1;
-
-			if (c == 'U')
-				day_offset = TM_SUNDAY;
-			else
-				day_offset = TM_MONDAY;
-
-			/* Set the date to the first Sunday (or Monday)
-			 * of the specified week of the year.
-			 */
-
-			tm->tm_yday = (7 - first_wday_of(tm->tm_year +
-				TM_YEAR_BASE) + day_offset) % 7 + (i - 1) * 7;
-			i = 0;
-			while (tm->tm_yday >=
-				start_of_month[isleap(tm->tm_year + TM_YEAR_BASE)][i])
-				i++;
-			if (i > 12)
-			{
-				i = 1;
-				tm->tm_yday -=
-					start_of_month[isleap(tm->tm_year +
-							TM_YEAR_BASE)][12];
-				tm->tm_year++;
-			}
-			tm->tm_mon = i - 1;
-			tm->tm_mday = tm->tm_yday -
-				start_of_month[isleap(tm->tm_year + TM_YEAR_BASE)]
-				[i - 1] + 1;
-			tm->tm_wday = day_offset;
-			flags |= FLAG_YEAR | FLAG_MONTH | FLAG_YDAY |
-				 FLAG_MDAY | FLAG_WDAY;
-
 			break;
 
 		case 'w':
@@ -438,7 +338,6 @@ label:
 				return (NULL);
 
 			tm->tm_wday = i;
-			flags != FLAG_WDAY;
 
 			break;
 
@@ -475,7 +374,6 @@ label:
 				return (NULL);
 
 			tm->tm_mday = i;
-			flags |= FLAG_MDAY;
 
 			break;
 
@@ -515,8 +413,6 @@ label:
 
 			tm->tm_mon = i;
 			buf += len;
-			flags |= FLAG_MONTH;
-
 			break;
 
 		case 'm':
@@ -534,7 +430,6 @@ label:
 				return (NULL);
 
 			tm->tm_mon = i - 1;
-			flags |= FLAG_MONTH;
 
 			break;
 
@@ -576,14 +471,13 @@ label:
 				len--;
 			}
 			if (c == 'Y')
-				i -= TM_YEAR_BASE;
+				i -= 1900;
 			if (c == 'y' && i < 69)
 				i += 100;
 			if (i < 0)
 				return (NULL);
 
 			tm->tm_year = i;
-			flags |= FLAG_YEAR;
 
 			break;
 
@@ -649,25 +543,10 @@ label:
 			break;
 		}
 	}
-
-	if (flags & (FLAG_YEAR | FLAG_MONTH)) {
-		if (!tm->tm_yday && (flags & FLAG_MDAY))
-			tm->tm_yday = start_of_month[isleap(tm->tm_year
-				+ TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1);
-		if (!tm->tm_wday) {
-			i = 0;
-			wday_offset = first_wday_of(tm->tm_year);
-			while (i++ <= tm->tm_yday)
-				if (wday_offset++ >= 6)
-					wday_offset = 0;
-
-			tm->tm_wday = wday_offset;
-		}
-	}
-
 	return ((char *)buf);
 }
 
+
 char *
 strptime_l(const char * __restrict buf, const char * __restrict fmt,
     struct tm * __restrict tm, locale_t loc)