From d90b34ff6591b80de159592cce090792d93ca2c1 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Mon, 9 Jun 2008 19:34:09 +0000
Subject: [PATCH] Fix datetime input functions to correctly detect integer
 overflow when running on a 64-bit platform ... strtol() will happily return
 64-bit output in that case.  Per bug #4231 from Geoff Tolley.

---
 src/backend/utils/adt/datetime.c | 41 ++++++++++++++++++++++----------
 1 file changed, 29 insertions(+), 12 deletions(-)

diff --git a/src/backend/utils/adt/datetime.c b/src/backend/utils/adt/datetime.c
index cbd1325a631..46a72973df1 100644
--- a/src/backend/utils/adt/datetime.c
+++ b/src/backend/utils/adt/datetime.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/datetime.c,v 1.184.2.1 2008/02/25 23:21:08 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/datetime.c,v 1.184.2.2 2008/06/09 19:34:09 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -256,6 +256,23 @@ static const datetkn *datecache[MAXDATEFIELDS] = {NULL};
 static const datetkn *deltacache[MAXDATEFIELDS] = {NULL};
 
 
+/*
+ * strtoi --- just like strtol, but returns int not long
+ */
+static int
+strtoi(const char *nptr, char **endptr, int base)
+{
+	long	val;
+
+	val = strtol(nptr, endptr, base);
+#ifdef HAVE_LONG_INT_64
+	if (val != (long) ((int32) val))
+		errno = ERANGE;
+#endif
+	return (int) val;
+}
+
+
 /*
  * Calendar time to Julian date conversions.
  * Julian date is commonly used in astronomical applications,
@@ -707,7 +724,7 @@ DecodeDateTime(char **field, int *ftype, int nf,
 						return DTERR_BAD_FORMAT;
 
 					errno = 0;
-					val = strtol(field[i], &cp, 10);
+					val = strtoi(field[i], &cp, 10);
 					if (errno == ERANGE)
 						return DTERR_FIELD_OVERFLOW;
 
@@ -855,7 +872,7 @@ DecodeDateTime(char **field, int *ftype, int nf,
 					int			val;
 
 					errno = 0;
-					val = strtol(field[i], &cp, 10);
+					val = strtoi(field[i], &cp, 10);
 					if (errno == ERANGE)
 						return DTERR_FIELD_OVERFLOW;
 
@@ -1590,7 +1607,7 @@ DecodeTimeOnly(char **field, int *ftype, int nf,
 					}
 
 					errno = 0;
-					val = strtol(field[i], &cp, 10);
+					val = strtoi(field[i], &cp, 10);
 					if (errno == ERANGE)
 						return DTERR_FIELD_OVERFLOW;
 
@@ -2207,14 +2224,14 @@ DecodeTime(char *str, int fmask, int *tmask, struct pg_tm * tm, fsec_t *fsec)
 	*tmask = DTK_TIME_M;
 
 	errno = 0;
-	tm->tm_hour = strtol(str, &cp, 10);
+	tm->tm_hour = strtoi(str, &cp, 10);
 	if (errno == ERANGE)
 		return DTERR_FIELD_OVERFLOW;
 	if (*cp != ':')
 		return DTERR_BAD_FORMAT;
 	str = cp + 1;
 	errno = 0;
-	tm->tm_min = strtol(str, &cp, 10);
+	tm->tm_min = strtoi(str, &cp, 10);
 	if (errno == ERANGE)
 		return DTERR_FIELD_OVERFLOW;
 	if (*cp == '\0')
@@ -2228,7 +2245,7 @@ DecodeTime(char *str, int fmask, int *tmask, struct pg_tm * tm, fsec_t *fsec)
 	{
 		str = cp + 1;
 		errno = 0;
-		tm->tm_sec = strtol(str, &cp, 10);
+		tm->tm_sec = strtoi(str, &cp, 10);
 		if (errno == ERANGE)
 			return DTERR_FIELD_OVERFLOW;
 		if (*cp == '\0')
@@ -2282,7 +2299,7 @@ DecodeNumber(int flen, char *str, bool haveTextMonth, int fmask,
 	*tmask = 0;
 
 	errno = 0;
-	val = strtol(str, &cp, 10);
+	val = strtoi(str, &cp, 10);
 	if (errno == ERANGE)
 		return DTERR_FIELD_OVERFLOW;
 	if (cp == str)
@@ -2573,7 +2590,7 @@ DecodeTimezone(char *str, int *tzp)
 		return DTERR_BAD_FORMAT;
 
 	errno = 0;
-	hr = strtol(str + 1, &cp, 10);
+	hr = strtoi(str + 1, &cp, 10);
 	if (errno == ERANGE)
 		return DTERR_TZDISP_OVERFLOW;
 
@@ -2581,13 +2598,13 @@ DecodeTimezone(char *str, int *tzp)
 	if (*cp == ':')
 	{
 		errno = 0;
-		min = strtol(cp + 1, &cp, 10);
+		min = strtoi(cp + 1, &cp, 10);
 		if (errno == ERANGE)
 			return DTERR_TZDISP_OVERFLOW;
 		if (*cp == ':')
 		{
 			errno = 0;
-			sec = strtol(cp + 1, &cp, 10);
+			sec = strtoi(cp + 1, &cp, 10);
 			if (errno == ERANGE)
 				return DTERR_TZDISP_OVERFLOW;
 		}
@@ -2777,7 +2794,7 @@ DecodeInterval(char **field, int *ftype, int nf, int *dtype, struct pg_tm * tm,
 			case DTK_DATE:
 			case DTK_NUMBER:
 				errno = 0;
-				val = strtol(field[i], &cp, 10);
+				val = strtoi(field[i], &cp, 10);
 				if (errno == ERANGE)
 					return DTERR_FIELD_OVERFLOW;