utf8-to-unicode.patch

diff --git a/src/backend/utils/mb/wchar.c b/src/backend/utils/mb/wchar.c
index e164866..1a2a24d 100644
--- a/src/backend/utils/mb/wchar.c
+++ b/src/backend/utils/mb/wchar.c
@@ -453,6 +453,34 @@ unicode_to_utf8(pg_wchar c, unsigned char *utf8string)
 	return utf8string;
 }
 
+/*
+ * Convert a UTF-8 character to a Unicode code point.
+ * This is a one-character version of pg_utf2wchar_with_len.
+ *
+ * c must point to a large enough string for the character's length.
+ */
+pg_wchar
+utf8_to_unicode(const unsigned char *c)
+{
+	if ((*c & 0x80) == 0)
+		return (pg_wchar) c[0];
+	else if ((*c & 0xe0) == 0xc0)
+		return (pg_wchar) (((c[0] & 0x1f) << 6) |
+						   (c[1] & 0x3f));
+	else if ((*c & 0xf0) == 0xe0)
+		return (pg_wchar) (((c[0] & 0x0f) << 12) |
+						   ((c[1] & 0x3f) << 6) |
+						   (c[2] & 0x3f));
+	else if ((*c & 0xf8) == 0xf0)
+		return (pg_wchar) (((c[0] & 0x07) << 18) |
+						   ((c[1] & 0x3f) << 12) |
+						   ((c[2] & 0x3f) << 6) |
+						   (c[3] & 0x3f));
+	else
+		/* that is an invalid code on purpose */
+		return 0xffffffff;
+}
+
 
 /*
  * Return the byte length of a UTF8 character pointed to by s
@@ -462,8 +490,8 @@ unicode_to_utf8(pg_wchar c, unsigned char *utf8string)
  * We return "1" for any leading byte that is either flat-out illegal or
  * indicates a length larger than we support.
  *
- * pg_utf2wchar_with_len(), utf2ucs(), pg_utf8_islegal(), and perhaps
- * other places would need to be fixed to change this.
+ * pg_utf2wchar_with_len(), utf8_to_unicode(), pg_utf8_islegal(),
+ * and perhaps other places would need to be fixed to change this.
  */
 int
 pg_utf_mblen(const unsigned char *s)
@@ -632,36 +660,10 @@ ucs_wcwidth(pg_wchar ucs)
 		  (ucs >= 0x20000 && ucs <= 0x2ffff)));
 }
 
-static pg_wchar
-utf2ucs(const unsigned char *c)
-{
-	/*
-	 * one char version of pg_utf2wchar_with_len. no control here, c must
-	 * point to a large enough string
-	 */
-	if ((*c & 0x80) == 0)
-		return (pg_wchar) c[0];
-	else if ((*c & 0xe0) == 0xc0)
-		return (pg_wchar) (((c[0] & 0x1f) << 6) |
-						   (c[1] & 0x3f));
-	else if ((*c & 0xf0) == 0xe0)
-		return (pg_wchar) (((c[0] & 0x0f) << 12) |
-						   ((c[1] & 0x3f) << 6) |
-						   (c[2] & 0x3f));
-	else if ((*c & 0xf8) == 0xf0)
-		return (pg_wchar) (((c[0] & 0x07) << 18) |
-						   ((c[1] & 0x3f) << 12) |
-						   ((c[2] & 0x3f) << 6) |
-						   (c[3] & 0x3f));
-	else
-		/* that is an invalid code on purpose */
-		return 0xffffffff;
-}
-
 static int
 pg_utf_dsplen(const unsigned char *s)
 {
-	return ucs_wcwidth(utf2ucs(s));
+	return ucs_wcwidth(utf8_to_unicode(s));
 }
 
 /*
diff --git a/src/bin/psql/mbprint.c b/src/bin/psql/mbprint.c
index b1263ea..4c8b1d8 100644
--- a/src/bin/psql/mbprint.c
+++ b/src/bin/psql/mbprint.c
@@ -63,7 +63,7 @@ utf2ucs(const unsigned char *c)
 						   ((c[1] & 0x3f) << 6) |
 						   (c[2] & 0x3f));
 	}
-	else if ((*c & 0xf0) == 0xf0)
+	else if ((*c & 0xf8) == 0xf0)
 	{
 		return (pg_wchar) (((c[0] & 0x07) << 18) |
 						   ((c[1] & 0x3f) << 12) |
diff --git a/src/include/mb/pg_wchar.h b/src/include/mb/pg_wchar.h
index 817f9aa..ea753a6 100644
--- a/src/include/mb/pg_wchar.h
+++ b/src/include/mb/pg_wchar.h
@@ -412,6 +412,7 @@ extern int	pg_valid_client_encoding(const char *name);
 extern int	pg_valid_server_encoding(const char *name);
 
 extern unsigned char *unicode_to_utf8(pg_wchar c, unsigned char *utf8string);
+extern pg_wchar utf8_to_unicode(const unsigned char *utf8char);
 extern int	pg_utf_mblen(const unsigned char *);
 extern unsigned char *pg_do_encoding_conversion(unsigned char *src, int len,
 						  int src_encoding,