ecpg: Remove useless return values

Remove useless or inconsistently used return values from functions,
matching backend changes 99bf328237 and
791359fe0e.

Reviewed-by: Michael Paquier <michael.paquier@gmail.com>

src/interfaces/ecpg/pgtypeslib/dt.h

@@ -313,12 +313,12 @@ do { \
 
 int			DecodeInterval(char **, int *, int, int *, struct tm *, fsec_t *);
 int			DecodeTime(char *, int *, struct tm *, fsec_t *);
-int			EncodeDateTime(struct tm *tm, fsec_t fsec, bool print_tz, int tz, const char *tzn, int style, char *str, bool EuroDates);
-int			EncodeInterval(struct tm *tm, fsec_t fsec, int style, char *str);
+void		EncodeDateTime(struct tm *tm, fsec_t fsec, bool print_tz, int tz, const char *tzn, int style, char *str, bool EuroDates);
+void		EncodeInterval(struct tm *tm, fsec_t fsec, int style, char *str);
 int			tm2timestamp(struct tm *, fsec_t, int *, timestamp *);
 int			DecodeUnits(int field, char *lowtoken, int *val);
 bool		CheckDateTokenTables(void);
-int			EncodeDateOnly(struct tm *tm, int style, char *str, bool EuroDates);
+void		EncodeDateOnly(struct tm *tm, int style, char *str, bool EuroDates);
 int			GetEpochTime(struct tm *);
 int			ParseDateTime(char *, char *, char **, int *, int *, char **);
 int			DecodeDateTime(char **, int *, int, int *, struct tm *, fsec_t *, bool);

src/interfaces/ecpg/pgtypeslib/dt_common.c

@@ -671,11 +671,10 @@ DecodeSpecial(int field, char *lowtoken, int *val)
 /* EncodeDateOnly()
  * Encode date as local time.
  */
-int
+void
 EncodeDateOnly(struct tm *tm, int style, char *str, bool EuroDates)
 {
-	if (tm->tm_mon < 1 || tm->tm_mon > MONTHS_PER_YEAR)
-		return -1;
+	Assert(tm->tm_mon >= 1 && tm->tm_mon <= MONTHS_PER_YEAR);
 
 	switch (style)
 	{
@@ -723,9 +722,7 @@ EncodeDateOnly(struct tm *tm, int style, char *str, bool EuroDates)
 				sprintf(str + 5, "-%04d %s", -(tm->tm_year - 1), "BC");
 			break;
 	}
-
-	return TRUE;
-}								/* EncodeDateOnly() */
+}
 
 void
 TrimTrailingZeros(char *str)
@@ -758,7 +755,7 @@ TrimTrailingZeros(char *str)
  *	US - mm/dd/yyyy
  *	European - dd/mm/yyyy
  */
-int
+void
 EncodeDateTime(struct tm *tm, fsec_t fsec, bool print_tz, int tz, const char *tzn, int style, char *str, bool EuroDates)
 {
 	int			day,
@@ -951,9 +948,7 @@ EncodeDateTime(struct tm *tm, fsec_t fsec, bool print_tz, int tz, const char *tz
 			}
 			break;
 	}
-
-	return TRUE;
-}								/* EncodeDateTime() */
+}
 
 int
 GetEpochTime(struct tm *tm)

src/interfaces/ecpg/pgtypeslib/interval.c

@@ -331,8 +331,6 @@ DecodeISO8601Interval(char *str,
  *	* ECPG semes not to have a global IntervalStyle
  *	  so added
  *		int IntervalStyle = INTSTYLE_POSTGRES;
- *
- *	* Assert wasn't available so removed it.
  */
 int
 DecodeInterval(char **field, int *ftype, int nf,	/* int range, */
@@ -374,7 +372,7 @@ DecodeInterval(char **field, int *ftype, int nf,	/* int range, */
 				 * least one digit; there could be ':', '.', '-' embedded in
 				 * it as well.
 				 */
-				/* Assert(*field[i] == '-' || *field[i] == '+'); */
+				Assert(*field[i] == '-' || *field[i] == '+');
 
 				/*
 				 * Try for hh:mm or hh:mm:ss.  If not, fall through to
@@ -771,7 +769,7 @@ AppendSeconds(char *cp, int sec, fsec_t fsec, int precision, bool fillzeros)
  * Change pg_tm to tm
  */
 
-int
+void
 EncodeInterval(struct /* pg_ */ tm *tm, fsec_t fsec, int style, char *str)
 {
 	char	   *cp = str;
@@ -947,9 +945,7 @@ EncodeInterval(struct /* pg_ */ tm *tm, fsec_t fsec, int style, char *str)
 				strcat(cp, " ago");
 			break;
 	}
-
-	return 0;
-}								/* EncodeInterval() */
+}
 
 
 /* interval2tm()
@@ -1091,11 +1087,7 @@ PGTYPESinterval_to_asc(interval * span)
 		return NULL;
 	}
 
-	if (EncodeInterval(tm, fsec, IntervalStyle, buf) != 0)
-	{
-		errno = PGTYPES_INTVL_BAD_INTERVAL;
-		return NULL;
-	}
+	EncodeInterval(tm, fsec, IntervalStyle, buf);
 
 	return pgtypes_strdup(buf);
 }

src/interfaces/ecpg/pgtypeslib/timestamp.c

@@ -192,7 +192,7 @@ timestamp2tm(timestamp dt, int *tzp, struct tm *tm, fsec_t *fsec, const char **t
 /* EncodeSpecialTimestamp()
  *	* Convert reserved timestamp data type to string.
  *	 */
-static int
+static void
 EncodeSpecialTimestamp(timestamp dt, char *str)
 {
 	if (TIMESTAMP_IS_NOBEGIN(dt))
@@ -200,10 +200,8 @@ EncodeSpecialTimestamp(timestamp dt, char *str)
 	else if (TIMESTAMP_IS_NOEND(dt))
 		strcpy(str, LATE);
 	else
-		return FALSE;
-
-	return TRUE;
-}								/* EncodeSpecialTimestamp() */
+		abort();				/* shouldn't happen */
+}
 
 timestamp
 PGTYPEStimestamp_from_asc(char *str, char **endptr)