From 775d28302cda48b3f22a2f4f9067de0cf5192fff Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Mon, 21 Mar 2005 16:29:20 +0000
Subject: [PATCH] Fix quote_ident to use quote_identifier rather than its own,
 not quite up-to-speed logic; in particular this will cause it to quote names
 that match keywords.  Remove unnecessary multibyte cruft from quote_literal
 (all backend-internal encodings are 8-bit-safe).

---
 src/backend/utils/adt/quote.c | 154 +++++-----------------------------
 1 file changed, 23 insertions(+), 131 deletions(-)

diff --git a/src/backend/utils/adt/quote.c b/src/backend/utils/adt/quote.c
index 7065a1f2e5..8650a0d2e8 100644
--- a/src/backend/utils/adt/quote.c
+++ b/src/backend/utils/adt/quote.c
@@ -7,23 +7,15 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/quote.c,v 1.14 2005/01/01 05:43:07 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/quote.c,v 1.15 2005/03/21 16:29:20 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
 #include "postgres.h"
 
-#include <ctype.h>
-
-#include "mb/pg_wchar.h"
 #include "utils/builtins.h"
 
 
-static bool quote_ident_required(text *iptr);
-static text *do_quote_ident(text *iptr);
-static text *do_quote_literal(text *iptr);
-
-
 /*
  * quote_ident -
  *	  returns a properly quoted identifier
@@ -33,16 +25,22 @@ quote_ident(PG_FUNCTION_ARGS)
 {
 	text	   *t = PG_GETARG_TEXT_P(0);
 	text	   *result;
+	const char *qstr;
+	char	   *str;
+	int			len;
 
-	if (quote_ident_required(t))
-		result = do_quote_ident(t);
-	else
-	{
-		result = (text *) palloc(VARSIZE(t));
-		memcpy(result, t, VARSIZE(t));
-	}
+	/* We have to convert to a C string to use quote_identifier */
+	len = VARSIZE(t) - VARHDRSZ;
+	str = (char *) palloc(len + 1);
+	memcpy(str, VARDATA(t), len);
+	str[len] = '\0';
 
-	PG_FREE_IF_COPY(t, 0);
+	qstr = quote_identifier(str);
+
+	len = strlen(qstr);
+	result = (text *) palloc(len + VARHDRSZ);
+	VARATT_SIZEP(result) = len + VARHDRSZ;
+	memcpy(VARDATA(result), qstr, len);
 
 	PG_RETURN_TEXT_P(result);
 }
@@ -56,136 +54,30 @@ quote_literal(PG_FUNCTION_ARGS)
 {
 	text	   *t = PG_GETARG_TEXT_P(0);
 	text	   *result;
-
-	result = do_quote_literal(t);
-
-	PG_FREE_IF_COPY(t, 0);
-
-	PG_RETURN_TEXT_P(result);
-}
-
-/*
- * Check if a given identifier needs quoting
- */
-static bool
-quote_ident_required(text *iptr)
-{
-	char	   *cp;
-	char	   *ep;
-
-	cp = VARDATA(iptr);
-	ep = VARDATA(iptr) + VARSIZE(iptr) - VARHDRSZ;
-
-	if (cp >= ep)
-		return true;
-
-	if (pg_mblen(cp) != 1)
-		return true;
-	if (!(*cp == '_' || (*cp >= 'a' && *cp <= 'z')))
-		return true;
-
-	while ((++cp) < ep)
-	{
-		if (pg_mblen(cp) != 1)
-			return true;
-
-		if (*cp >= 'a' && *cp <= 'z')
-			continue;
-		if (*cp >= '0' && *cp <= '9')
-			continue;
-		if (*cp == '_')
-			continue;
-
-		return true;
-	}
-
-	return false;
-}
-
-/*
- * Return a properly quoted identifier
- */
-static text *
-do_quote_ident(text *iptr)
-{
-	text	   *result;
 	char	   *cp1;
 	char	   *cp2;
 	int			len;
-	int			wl;
 
-	len = VARSIZE(iptr) - VARHDRSZ;
-	result = (text *) palloc(len * 2 + VARHDRSZ + 2);
+	len = VARSIZE(t) - VARHDRSZ;
+	/* We make a worst-case result area; wasting a little space is OK */
+	result = (text *) palloc(len * 2 + 2 + VARHDRSZ);
 
-	cp1 = VARDATA(iptr);
-	cp2 = VARDATA(result);
-
-	*cp2++ = '"';
-	while (len > 0)
-	{
-		if ((wl = pg_mblen(cp1)) != 1)
-		{
-			len -= wl;
-
-			while (wl-- > 0)
-				*cp2++ = *cp1++;
-			continue;
-		}
-
-		if (*cp1 == '"')
-			*cp2++ = '"';
-		*cp2++ = *cp1++;
-
-		len--;
-	}
-	*cp2++ = '"';
-
-	VARATT_SIZEP(result) = cp2 - ((char *) result);
-
-	return result;
-}
-
-/*
- * Return a properly quoted literal value
- */
-static text *
-do_quote_literal(text *lptr)
-{
-	text	   *result;
-	char	   *cp1;
-	char	   *cp2;
-	int			len;
-	int			wl;
-
-	len = VARSIZE(lptr) - VARHDRSZ;
-	result = (text *) palloc(len * 2 + VARHDRSZ + 2);
-
-	cp1 = VARDATA(lptr);
+	cp1 = VARDATA(t);
 	cp2 = VARDATA(result);
 
 	*cp2++ = '\'';
-	while (len > 0)
+	while (len-- > 0)
 	{
-		if ((wl = pg_mblen(cp1)) != 1)
-		{
-			len -= wl;
-
-			while (wl-- > 0)
-				*cp2++ = *cp1++;
-			continue;
-		}
-
 		if (*cp1 == '\'')
 			*cp2++ = '\'';
-		if (*cp1 == '\\')
+		else if (*cp1 == '\\')
 			*cp2++ = '\\';
-		*cp2++ = *cp1++;
 
-		len--;
+		*cp2++ = *cp1++;
 	}
 	*cp2++ = '\'';
 
 	VARATT_SIZEP(result) = cp2 - ((char *) result);
 
-	return result;
+	PG_RETURN_TEXT_P(result);
 }
-- 
2.40.0