Make sure monetary, numeric, and time locale categories are set to C and

are only activated temporarily to read out formatting information.

doc/src/sgml/runtime.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.122 2002/07/31 17:19:50 tgl Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.123 2002/08/09 22:52:04 petere Exp $
 -->
 
 <Chapter Id="runtime">
@@ -1451,8 +1451,9 @@ dynamic_library_path = '/usr/local/lib/postgresql:/home/my_project/lib:$libdir'
       <term><varname>LC_MONETARY</varname> (<type>string</type>)</term>
       <listitem>
        <para>
-        Sets the locale to use for formatting monetary amounts.
-        Acceptable values are system-dependent; see <xref
+        Sets the locale to use for formatting monetary amounts, for
+        example with the <function>to_char()</function> family of
+        functions.  Acceptable values are system-dependent; see <xref
         linkend="locale"> for more information.  If this variable is
         set to the empty string (which is the default) then the value
         is inherited from the execution environment of the server in a
@@ -1480,9 +1481,9 @@ dynamic_library_path = '/usr/local/lib/postgresql:/home/my_project/lib:$libdir'
       <term><varname>LC_TIME</varname> (<type>string</type>)</term>
       <listitem>
        <para>
-        Sets the locale to use for formatting date and time values,
-        for example with the <function>to_char()</function> family of
-        functions. Acceptable values are system-dependent; see <xref
+        Sets the locale to use for formatting date and time values.
+        (Currently, this setting does nothing, but it may in the
+        future.)  Acceptable values are system-dependent; see <xref
         linkend="locale"> for more information.  If this variable is
         set to the empty string (which is the default) then the value
         is inherited from the execution environment of the server in a

src/backend/main/main.c

@@ -13,7 +13,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/main/main.c,v 1.52 2002/06/20 20:29:29 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/main/main.c,v 1.53 2002/08/09 22:52:04 petere Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -134,9 +134,11 @@ main(int argc, char *argv[])
 #ifdef LC_MESSAGES
 	setlocale(LC_MESSAGES, "");
 #endif
-	setlocale(LC_MONETARY, "");
-	setlocale(LC_NUMERIC, "");
-	setlocale(LC_TIME, "");
+	/* We don't use these during startup.  See also pg_locale.c about
+	 * why these are set to "C". */
+	setlocale(LC_MONETARY, "C");
+	setlocale(LC_NUMERIC, "C");
+	setlocale(LC_TIME, "C");
 
 #ifdef ENABLE_NLS
 	bindtextdomain("postgres", LOCALEDIR);

src/backend/utils/adt/pg_locale.c

@@ -2,13 +2,35 @@
  *
  * PostgreSQL locale utilities
  *
- * $Header: /cvsroot/pgsql/src/backend/utils/adt/pg_locale.c,v 1.17 2002/05/17 01:19:18 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/pg_locale.c,v 1.18 2002/08/09 22:52:04 petere Exp $
  *
  * Portions Copyright (c) 2002, PostgreSQL Global Development Group
  *
  *-----------------------------------------------------------------------
  */
 
+/*
+ * Here is how the locale stuff is handled: LC_COLLATE and LC_CTYPE
+ * are fixed by initdb, stored in pg_control, and cannot be changed.
+ * Thus, the effects of strcoll(), strxfrm(), isupper(), toupper(),
+ * etc. are always in the same fixed locale.
+ *
+ * LC_MESSAGES is settable at run time and will take effect
+ * immediately.
+ *
+ * The other categories, LC_MONETARY, LC_NUMERIC, and LC_TIME are also
+ * settable at run-time.  However, we don't actually set those locale
+ * categories permanently.  This would have bizzare effects like no
+ * longer accepting standard floating-point literals in some locales.
+ * Instead, we only set the locales briefly when needed, cache the
+ * required information obtained from localeconv(), and set them back.
+ * The information is only used by the formatting functions (to_char,
+ * etc.) and the money type.  For the user, this should all be
+ * transparent.  (Actually, LC_TIME doesn't do anything at all right
+ * now.)
+ */
+
+
 #include "postgres.h"
 
 #include <locale.h>
@@ -16,6 +38,10 @@
 #include "utils/pg_locale.h"
 
 
+/* indicated whether locale information cache is valid */
+static bool CurrentLocaleConvValid = false;
+
+
 /* GUC storage area */
 
 char *locale_messages;
@@ -26,16 +52,14 @@ char *locale_time;
 
 /* GUC assign hooks */
 
+/*
+ * This is common code for several locale categories.  This doesn't
+ * actually set the locale permanently, it only tests if the locale is
+ * valid.  (See explanation at the top of this file.)
+ */
 static const char *
 locale_xxx_assign(int category, const char *value, bool doit, bool interactive)
 {
-	if (doit)
-	{
-		if (!setlocale(category, value))
-			return NULL;
-	}
-	else
-	{
 	char *save;
 
 	save = setlocale(category, NULL);
@@ -46,21 +70,15 @@ locale_xxx_assign(int category, const char *value, bool doit, bool interactive)
 		return NULL;
 
 	setlocale(category, save);
-	}
-	return value;
-}
 
-const char *
-locale_messages_assign(const char *value, bool doit, bool interactive)
-{
-	/* LC_MESSAGES category does not exist everywhere, but accept it anyway */
-#ifdef LC_MESSAGES
-	return locale_xxx_assign(LC_MESSAGES, value, doit, interactive);
-#else
+	/* need to reload cache next time */
+	if (doit)
+		CurrentLocaleConvValid = false;
+
 	return value;
-#endif
 }
 
+
 const char *
 locale_monetary_assign(const char *value, bool doit, bool interactive)
 {
@@ -80,6 +98,37 @@ locale_time_assign(const char *value, bool doit, bool interactive)
 }
 
 
+/*
+ * lc_messages takes effect immediately
+ */
+const char *
+locale_messages_assign(const char *value, bool doit, bool interactive)
+{
+	/* LC_MESSAGES category does not exist everywhere, but accept it anyway */
+#ifdef LC_MESSAGES
+	if (doit)
+	{
+		if (!setlocale(LC_MESSAGES, value))
+			return NULL;
+	}
+	else
+	{
+		char *save;
+
+		save = setlocale(LC_MESSAGES, NULL);
+		if (!save)
+			return NULL;
+		
+		if (!setlocale(LC_MESSAGES, value))
+			return NULL;
+		
+		setlocale(LC_MESSAGES, save);
+	}
+#endif
+	return value;
+}
+
+
 /*
  * We'd like to cache whether LC_COLLATE is C (or POSIX), so we can
  * optimize a few code paths in various places.
@@ -107,6 +156,39 @@ lc_collate_is_c(void)
 }
 
 
+/*
+ * Frees the malloced content of a struct lconv.  (But not the struct
+ * itself.)
+ */
+static void
+free_struct_lconv(struct lconv *s)
+{
+	if (s == NULL)
+		return;
+
+	if (s->currency_symbol)
+		free(s->currency_symbol);
+	if (s->decimal_point)
+		free(s->decimal_point);
+	if (s->grouping)
+		free(s->grouping);
+	if (s->thousands_sep)
+		free(s->thousands_sep);
+	if (s->int_curr_symbol)
+		free(s->int_curr_symbol);
+	if (s->mon_decimal_point)
+		free(s->mon_decimal_point);
+	if (s->mon_grouping)
+		free(s->mon_grouping);
+	if (s->mon_thousands_sep)
+		free(s->mon_thousands_sep);
+	if (s->negative_sign)
+		free(s->negative_sign);
+	if (s->positive_sign)
+		free(s->positive_sign);
+}
+
+
 /*
  * Return the POSIX lconv struct (contains number/money formatting
  * information) with locale information for all categories.
@@ -114,16 +196,24 @@ lc_collate_is_c(void)
 struct lconv *
 PGLC_localeconv(void)
 {
-	static bool CurrentLocaleConvValid = false;
 	static struct lconv CurrentLocaleConv;
-
 	struct lconv *extlconv;
+	char	   *save_lc_monetary;
+	char	   *save_lc_numeric;
 
 	/* Did we do it already? */
 	if (CurrentLocaleConvValid)
 		return &CurrentLocaleConv;
 
-	/* Get formatting information for the external environment */
+	free_struct_lconv(&CurrentLocaleConv);
+
+	save_lc_monetary = setlocale(LC_MONETARY, NULL);
+	save_lc_numeric = setlocale(LC_NUMERIC, NULL);
+
+	setlocale(LC_MONETARY, locale_monetary);
+	setlocale(LC_NUMERIC, locale_numeric);
+
+	/* Get formatting information */
 	extlconv = localeconv();
 
 	/*
@@ -141,6 +231,10 @@ PGLC_localeconv(void)
 	CurrentLocaleConv.mon_thousands_sep = strdup(extlconv->mon_thousands_sep);
 	CurrentLocaleConv.negative_sign = strdup(extlconv->negative_sign);
 	CurrentLocaleConv.positive_sign = strdup(extlconv->positive_sign);
+	CurrentLocaleConv.n_sign_posn = extlconv->n_sign_posn;
+
+	setlocale(LC_MONETARY, save_lc_monetary);
+	setlocale(LC_NUMERIC, save_lc_numeric);
 
 	CurrentLocaleConvValid = true;
 	return &CurrentLocaleConv;