<!--
-$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">
<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
<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
*
* 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>
#include "utils/pg_locale.h"
+/* indicated whether locale information cache is valid */
+static bool CurrentLocaleConvValid = false;
+
+
/* GUC storage area */
char *locale_messages;
/* 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;
+ char *save;
- save = setlocale(category, NULL);
- if (!save)
- return NULL;
+ save = setlocale(category, NULL);
+ if (!save)
+ return NULL;
- if (!setlocale(category, value))
- return NULL;
+ if (!setlocale(category, value))
+ return NULL;
- setlocale(category, save);
- }
- return value;
-}
+ setlocale(category, save);
+
+ /* need to reload cache next time */
+ if (doit)
+ CurrentLocaleConvValid = false;
-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
return value;
-#endif
}
+
const char *
locale_monetary_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.
*/
/*
+ * 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.
*/
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();
/*
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;
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