Tell gettext which codeset to use by calling bind_textdomain_codeset(). We

already did that on Windows, but it's needed on other platforms too when
LC_CTYPE=C. With other locales, we enforce (or trust) that the codeset of
the locale matches the server encoding so we don't need to bind it
explicitly. It should do no harm in that case either, but I don't have
full faith in the PG encoding -> OS codeset mapping table yet. Per recent
discussion on pgsql-hackers.

src/backend/utils/init/miscinit.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/init/miscinit.c,v 1.173 2009/03/08 16:07:12 alvherre Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/init/miscinit.c,v 1.174 2009/04/08 09:50:48 heikki Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1242,7 +1242,7 @@ pg_bindtextdomain(const char *domain)
 
 		get_locale_path(my_exec_path, locale_path);
 		bindtextdomain(domain, locale_path);
-		pg_bind_textdomain_codeset(domain, GetDatabaseEncoding());
+		pg_bind_textdomain_codeset(domain);
 	}
 #endif
 }

src/backend/utils/init/postinit.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.188 2009/02/18 15:58:41 heikki Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.189 2009/04/08 09:50:48 heikki Exp $
  *
  *
  *-------------------------------------------------------------------------
@@ -265,6 +265,9 @@ CheckMyDatabase(const char *name, bool am_superuser)
 	SetConfigOption("lc_collate", collate, PGC_INTERNAL, PGC_S_OVERRIDE);
 	SetConfigOption("lc_ctype", ctype, PGC_INTERNAL, PGC_S_OVERRIDE);
 
+	/* Use the right encoding in translated messages */
+	pg_bind_textdomain_codeset(textdomain(NULL));
+
 	/*
 	 * Lastly, set up any database-specific configuration variables.
 	 */

src/backend/utils/mb/mbutils.c

@@ -4,7 +4,7 @@
  *
  * Tatsuo Ishii
  *
- * $PostgreSQL: pgsql/src/backend/utils/mb/mbutils.c,v 1.84 2009/04/06 19:34:52 petere Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/mb/mbutils.c,v 1.85 2009/04/08 09:50:48 heikki Exp $
  */
 #include "postgres.h"
 
@@ -890,7 +890,7 @@ cliplen(const char *str, int len, int limit)
 	return l;
 }
 
-#if defined(ENABLE_NLS) && defined(WIN32)
+#if defined(ENABLE_NLS)
 static const struct codeset_map {
 	int	encoding;
 	const char *codeset;
@@ -929,7 +929,7 @@ static const struct codeset_map {
 	{PG_EUC_TW, "EUC-TW"},
 	{PG_EUC_JIS_2004, "EUC-JP"}
 };
-#endif /* WIN32 */
+#endif /* ENABLE_NLS */
 
 void
 SetDatabaseEncoding(int encoding)
@@ -939,22 +939,36 @@ SetDatabaseEncoding(int encoding)
 
 	DatabaseEncoding = &pg_enc2name_tbl[encoding];
 	Assert(DatabaseEncoding->encoding == encoding);
-
-#ifdef ENABLE_NLS
-	pg_bind_textdomain_codeset(textdomain(NULL), encoding);
-#endif
 }
 
 /*
- * On Windows, we need to explicitly bind gettext to the correct
- * encoding, because gettext() tends to get confused.
+ * Bind gettext to the codeset equivalent with the database encoding.
  */
 void
-pg_bind_textdomain_codeset(const char *domainname, int encoding)
+pg_bind_textdomain_codeset(const char *domainname)
 {
-#if defined(ENABLE_NLS) && defined(WIN32)
+#if defined(ENABLE_NLS)
+	int		encoding = GetDatabaseEncoding();
 	int     i;
 
+	/*
+	 * gettext() uses the codeset specified by LC_CTYPE by default,
+	 * so if that matches the database encoding we don't need to do
+	 * anything. In CREATE DATABASE, we enforce or trust that the
+	 * locale's codeset matches database encoding, except for the C
+	 * locale. In C locale, we bind gettext() explicitly to the right
+	 * codeset.
+	 *
+	 * On Windows, though, gettext() tends to get confused so we always
+	 * bind it.
+	 */
+#ifndef WIN32
+	const char *ctype = setlocale(LC_CTYPE, NULL);
+
+	if (pg_strcasecmp(ctype, "C") != 0 && pg_strcasecmp(ctype, "POSIX") != 0)
+		return;
+#endif
+
 	for (i = 0; i < lengthof(codeset_map_array); i++)
 	{
 		if (codeset_map_array[i].encoding == encoding)

src/include/mb/pg_wchar.h

@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/mb/pg_wchar.h,v 1.88 2009/04/02 17:30:53 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/mb/pg_wchar.h,v 1.89 2009/04/08 09:50:48 heikki Exp $
  *
  *	NOTES
  *		This is used both by the backend and by libpq, but should not be
@@ -391,7 +391,7 @@ extern const char *pg_get_client_encoding_name(void);
 extern void SetDatabaseEncoding(int encoding);
 extern int	GetDatabaseEncoding(void);
 extern const char *GetDatabaseEncodingName(void);
-extern void pg_bind_textdomain_codeset(const char *domainname, int encoding);
+extern void pg_bind_textdomain_codeset(const char *domainname);
 
 extern int	pg_valid_client_encoding(const char *name);
 extern int	pg_valid_server_encoding(const char *name);