Peter found bug in the to_char() routine for PL/MI options. This

 patch fix it -- but this patch doesn't contains tests or docs fixes. I
 will send it later.

 Fixed outputs:

select  to_char(x, '9999.999')  as x,
        to_char(x, 'S9999.999') as s,
        to_char(x, 'SG9999.999') as sg,
        to_char(x, 'MI9999.999') as mi,
        to_char(x, 'PL9999.999') as pl,
        to_char(x, 'PLMI9999.999') as plmi,
        to_char(x, '9999.999SG') as sg2,
        to_char(x, '9999.999PL') as pl2,
        to_char(x, '9999.999MI') as mi2 from num;

Karel Zak

src/backend/utils/adt/formatting.c

 /* -----------------------------------------------------------------------
  * formatting.c
  *
- * $Header: /cvsroot/pgsql/src/backend/utils/adt/formatting.c,v 1.58 2003/03/10 22:28:18 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/formatting.c,v 1.59 2003/03/20 05:19:26 momjian Exp $
  *
  *
  *	 Portions Copyright (c) 1999-2002, PostgreSQL Global Development Group
@@ -276,17 +276,19 @@ typedef struct
  * Flags for NUMBER version
  * ----------
  */
-#define NUM_F_DECIMAL	0x01
-#define NUM_F_LDECIMAL	0x02
-#define NUM_F_ZERO	0x04
-#define NUM_F_BLANK 0x08
-#define NUM_F_FILLMODE	0x10
-#define NUM_F_LSIGN 0x20
-#define NUM_F_BRACKET	0x40
-#define NUM_F_MINUS 0x80
-#define NUM_F_PLUS	0x100
-#define NUM_F_ROMAN 0x200
-#define NUM_F_MULTI 0x400
+#define NUM_F_DECIMAL		1 << 1
+#define NUM_F_LDECIMAL		1 << 2
+#define NUM_F_ZERO		1 << 3
+#define NUM_F_BLANK 		1 << 4
+#define NUM_F_FILLMODE		1 << 5
+#define NUM_F_LSIGN 		1 << 6
+#define NUM_F_BRACKET		1 << 7
+#define NUM_F_MINUS 		1 << 8
+#define NUM_F_PLUS		1 << 9
+#define NUM_F_ROMAN 		1 << 10
+#define NUM_F_MULTI		1 << 11
+#define NUM_F_PLUS_POST 	1 << 12
+#define NUM_F_MINUS_POST	1 << 13
 
 #define NUM_LSIGN_PRE	-1
 #define NUM_LSIGN_POST	1
@@ -1052,6 +1054,8 @@ NUMDesc_prepare(NUMDesc *num, FormatNode *n)
 				elog(ERROR, "to_char/to_number(): can't use 'S' and 'MI' together.");
 			}
 			num->flag |= NUM_F_MINUS;
+			if (IS_DECIMAL(num))
+				num->flag |= NUM_F_MINUS_POST;
 			break;
 
 		case NUM_PL:
@@ -1061,6 +1065,8 @@ NUMDesc_prepare(NUMDesc *num, FormatNode *n)
 				elog(ERROR, "to_char/to_number(): can't use 'S' and 'PL' together.");
 			}
 			num->flag |= NUM_F_PLUS;
+			if (IS_DECIMAL(num))
+				num->flag |= NUM_F_PLUS_POST;
 			break;
 
 		case NUM_SG:
@@ -3881,12 +3887,23 @@ NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number,
 	{
 		Np->sign = sign;
 		
+		/* MI/PL/SG - write sign itself and not in number */
+		if (IS_PLUS(Np->Num) || IS_MINUS(Np->Num))
+		{
+			if (IS_PLUS(Np->Num) && IS_MINUS(Np->Num)==FALSE)
+				Np->sign_wrote = FALSE;
+			Np->sign_pos = -1;
+		}
+		else
+		{
 			if (Np->sign != '-')
 			{
+				if (IS_BRACKET(Np->Num))
 					Np->Num->flag &= ~NUM_F_BRACKET;
+				if (IS_MINUS(Np->Num))
 					Np->Num->flag &= ~NUM_F_MINUS;
 			}
-		else if (Np->sign != '+')
+			else if (Np->sign != '+' && IS_PLUS(Np->Num))
 				Np->Num->flag &= ~NUM_F_PLUS;
 
 			if (Np->sign == '+' && IS_FILLMODE(Np->Num) && !IS_LSIGN(Np->Num))
@@ -3898,10 +3915,7 @@ NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number,
 
 			if (Np->Num->lsign == NUM_LSIGN_PRE && Np->Num->pre == Np->Num->pre_lsign_num)
 				Np->Num->lsign = NUM_LSIGN_POST;
-
-		/* MI/PL/SG - write sign itself and not in number */
-		if (IS_PLUS(Np->Num) || IS_MINUS(Np->Num))
-			Np->sign_wrote = TRUE;		/* needn't sign */
+		}
 	}
 
 	/*
@@ -3946,17 +3960,15 @@ NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number,
 			/*
 			 * terrible Ora format
 			 */
-			if (!IS_ZERO(Np->Num) && *Np->number == '0' &&
-				!IS_FILLMODE(Np->Num) && Np->Num->post != 0)
+			if (IS_ZERO(Np->Num)==FALSE && *Np->number == '0' &&
+				IS_FILLMODE(Np->Num)==FALSE && Np->Num->post)
 			{
 
 				++Np->sign_pos;
 
 				if (IS_LSIGN(Np->Num))
 				{
-					if (Np->Num->lsign == NUM_LSIGN_PRE)
-						++Np->sign_pos;
-					else
+					if (Np->Num->lsign != NUM_LSIGN_PRE)
 						--Np->sign_pos;
 				}
 			}
@@ -3975,8 +3987,8 @@ NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number,
 
 #ifdef DEBUG_TO_FROM_CHAR
 	elog(DEBUG_elog_output,
-
-		 "\n\tNUM: '%s'\n\tPRE: %d\n\tPOST: %d\n\tNUM_COUNT: %d\n\tNUM_PRE: %d\n\tSIGN_POS: %d\n\tSIGN_WROTE: %s\n\tZERO: %s\n\tZERO_START: %d\n\tZERO_END: %d\n\tLAST_RELEVANT: %s",
+		 "\n\tSIGN: '%c'\n\tNUM: '%s'\n\tPRE: %d\n\tPOST: %d\n\tNUM_COUNT: %d\n\tNUM_PRE: %d\n\tSIGN_POS: %d\n\tSIGN_WROTE: %s\n\tZERO: %s\n\tZERO_START: %d\n\tZERO_END: %d\n\tLAST_RELEVANT: %s\n\tBRACKET: %s\n\tPLUS: %s\n\tMINUS: %s",
+		 Np->sign,
 		 Np->number,
 		 Np->Num->pre,
 		 Np->Num->post,
@@ -3987,7 +3999,10 @@ NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number,
 		 IS_ZERO(Np->Num) ? "Yes" : "No",
 		 Np->Num->zero_start,
 		 Np->Num->zero_end,
-		 Np->last_relevant ? Np->last_relevant : "<not set>"
+		 Np->last_relevant ? Np->last_relevant : "<not set>",
+		 IS_BRACKET(Np->Num) ? "Yes" : "No",
+		 IS_PLUS(Np->Num) ? "Yes" : "No",
+		 IS_MINUS(Np->Num) ? "Yes" : "No"
 	);
 #endif