Arrange to set the LC_XXX environment variables to match our locale

setup.  This protects against undesired changes in locale behavior
if someone carelessly does setlocale(LC_ALL, "") (and we know who
you are, perl guys).

src/backend/access/transam/xlog.c

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.223 2005/11/22 18:17:07 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.224 2005/12/28 23:22:50 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -45,6 +45,7 @@
 #include "utils/builtins.h"
 #include "utils/guc.h"
 #include "utils/nabstime.h"
+#include "utils/pg_locale.h"
 #include "utils/relcache.h"
 
 
@@ -3619,14 +3620,14 @@ ReadControlFile(void)
 				  " but the server was compiled with LOCALE_NAME_BUFLEN %d.",
 						   ControlFile->localeBuflen, LOCALE_NAME_BUFLEN),
 				 errhint("It looks like you need to recompile or initdb.")));
-	if (setlocale(LC_COLLATE, ControlFile->lc_collate) == NULL)
+	if (pg_perm_setlocale(LC_COLLATE, ControlFile->lc_collate) == NULL)
 		ereport(FATAL,
 			(errmsg("database files are incompatible with operating system"),
 			 errdetail("The database cluster was initialized with LC_COLLATE \"%s\","
 					   " which is not recognized by setlocale().",
 					   ControlFile->lc_collate),
 			 errhint("It looks like you need to initdb or install locale support.")));
-	if (setlocale(LC_CTYPE, ControlFile->lc_ctype) == NULL)
+	if (pg_perm_setlocale(LC_CTYPE, ControlFile->lc_ctype) == NULL)
 		ereport(FATAL,
 			(errmsg("database files are incompatible with operating system"),
 		errdetail("The database cluster was initialized with LC_CTYPE \"%s\","

src/backend/main/main.c

@@ -13,13 +13,12 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/main/main.c,v 1.97 2005/11/22 18:17:11 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/main/main.c,v 1.98 2005/12/28 23:22:51 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
 #include "postgres.h"
 
-#include <errno.h>
 #include <pwd.h>
 #include <unistd.h>
 
@@ -40,6 +39,7 @@
 #include "postmaster/postmaster.h"
 #include "tcop/tcopprot.h"
 #include "utils/help_config.h"
+#include "utils/pg_locale.h"
 #include "utils/ps_status.h"
 #ifdef WIN32
 #include "libpq/pqsignal.h"
@@ -162,30 +162,37 @@ main(int argc, char *argv[])
 	 */
 
 	if ((env_locale = getenv("LC_COLLATE")) != NULL)
-		setlocale(LC_COLLATE, env_locale);
+		pg_perm_setlocale(LC_COLLATE, env_locale);
 	else
-		setlocale(LC_COLLATE, "");
+		pg_perm_setlocale(LC_COLLATE, "");
 
 	if ((env_locale = getenv("LC_CTYPE")) != NULL)
-		setlocale(LC_CTYPE, env_locale);
+		pg_perm_setlocale(LC_CTYPE, env_locale);
 	else
-		setlocale(LC_CTYPE, "");
+		pg_perm_setlocale(LC_CTYPE, "");
 #else
-	setlocale(LC_COLLATE, "");
-	setlocale(LC_CTYPE, "");
+	pg_perm_setlocale(LC_COLLATE, "");
+	pg_perm_setlocale(LC_CTYPE, "");
 #endif
 
 #ifdef LC_MESSAGES
-	setlocale(LC_MESSAGES, "");
+	pg_perm_setlocale(LC_MESSAGES, "");
 #endif
 
 	/*
 	 * We keep these set to "C" always, except transiently in pg_locale.c; see
 	 * that file for explanations.
 	 */
-	setlocale(LC_MONETARY, "C");
-	setlocale(LC_NUMERIC, "C");
-	setlocale(LC_TIME, "C");
+	pg_perm_setlocale(LC_MONETARY, "C");
+	pg_perm_setlocale(LC_NUMERIC, "C");
+	pg_perm_setlocale(LC_TIME, "C");
+
+	/*
+	 * Now that we have absorbed as much as we wish to from the locale
+	 * environment, remove any LC_ALL setting, so that the environment
+	 * variables installed by pg_perm_setlocale have force.
+	 */
+	unsetenv("LC_ALL");
 
 	/*
 	 * Skip permission checks if we're just trying to do --help or --version;

src/backend/utils/adt/pg_locale.c

@@ -4,7 +4,7 @@
  *
  * Portions Copyright (c) 2002-2005, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/backend/utils/adt/pg_locale.c,v 1.32 2005/10/15 02:49:29 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/adt/pg_locale.c,v 1.33 2005/12/28 23:22:51 tgl Exp $
  *
  *-----------------------------------------------------------------------
  */
@@ -50,13 +50,10 @@
 
 #include <locale.h>
 
+#include "catalog/pg_control.h"
 #include "utils/pg_locale.h"
 
 
-/* indicated whether locale information cache is valid */
-static bool CurrentLocaleConvValid = false;
-
-
 /* GUC storage area */
 
 char	   *locale_messages;
@@ -64,6 +61,118 @@ char	   *locale_monetary;
 char	   *locale_numeric;
 char	   *locale_time;
 
+/* indicates whether locale information cache is valid */
+static bool CurrentLocaleConvValid = false;
+
+/* Environment variable storage area */
+
+#define LC_ENV_BUFSIZE (LOCALE_NAME_BUFLEN + 20)
+
+static char lc_collate_envbuf[LC_ENV_BUFSIZE];
+static char lc_ctype_envbuf[LC_ENV_BUFSIZE];
+#ifdef LC_MESSAGES
+static char lc_messages_envbuf[LC_ENV_BUFSIZE];
+#endif
+static char lc_monetary_envbuf[LC_ENV_BUFSIZE];
+static char lc_numeric_envbuf[LC_ENV_BUFSIZE];
+static char lc_time_envbuf[LC_ENV_BUFSIZE];
+
+
+/*
+ * pg_perm_setlocale
+ *
+ * This is identical to the libc function setlocale(), with the addition
+ * that if the operation is successful, the corresponding LC_XXX environment
+ * variable is set to match.  By setting the environment variable, we ensure
+ * that any subsequent use of setlocale(..., "") will preserve the settings
+ * made through this routine.  Of course, LC_ALL must also be unset to fully
+ * ensure that, but that has to be done elsewhere after all the individual
+ * LC_XXX variables have been set correctly.  (Thank you Perl for making this
+ * kluge necessary.)
+ */
+char *
+pg_perm_setlocale(int category, const char *locale)
+{
+	char   *result;
+	const char *envvar;
+	char   *envbuf;
+
+#ifndef WIN32
+	result = setlocale(category, locale);
+#else
+	/*
+	 * On Windows, setlocale(LC_MESSAGES) does not work, so just assume
+	 * that the given value is good and set it in the environment variables.
+	 * We must ignore attempts to set to "", which means "keep using the
+	 * old environment value".
+	 */
+	if (category != LC_MESSAGES)
+		result = setlocale(category, locale);
+	else
+	{
+		result = (char *) locale;
+		if (locale == NULL || locale[0] == '\0')
+			return result;
+	}
+#endif
+
+	if (result == NULL)
+		return result;			/* fall out immediately on failure */
+
+	switch (category)
+	{
+		case LC_COLLATE:
+			envvar = "LC_COLLATE";
+			envbuf = lc_collate_envbuf;
+			break;
+		case LC_CTYPE:
+			envvar = "LC_CTYPE";
+			envbuf = lc_ctype_envbuf;
+			break;
+#ifdef LC_MESSAGES
+		case LC_MESSAGES:
+			envvar = "LC_MESSAGES";
+			envbuf = lc_messages_envbuf;
+			break;
+#endif
+		case LC_MONETARY:
+			envvar = "LC_MONETARY";
+			envbuf = lc_monetary_envbuf;
+			break;
+		case LC_NUMERIC:
+			envvar = "LC_NUMERIC";
+			envbuf = lc_numeric_envbuf;
+			break;
+		case LC_TIME:
+			envvar = "LC_TIME";
+			envbuf = lc_time_envbuf;
+			break;
+		default:
+			elog(FATAL, "unrecognized LC category: %d", category);
+			envvar = NULL;		/* keep compiler quiet */
+			envbuf = NULL;
+			break;
+	}
+
+	snprintf(envbuf, LC_ENV_BUFSIZE-1, "%s=%s", envvar, result);
+
+#ifndef WIN32
+	if (putenv(envbuf))
+		return NULL;
+#else
+	/*
+	 * On Windows, we need to modify both the process environment and the
+	 * cached version in msvcrt
+	 */
+	if (!SetEnvironmentVariable(envvar, result))
+		return NULL;
+	if (_putenv(envbuf))
+		return NULL;
+#endif
+
+	return result;
+}
+
 
 /* GUC assign hooks */
 
@@ -123,48 +232,24 @@ locale_time_assign(const char *value, bool doit, GucSource source)
 const char *
 locale_messages_assign(const char *value, bool doit, GucSource source)
 {
-#ifndef WIN32
-
 	/*
 	 * LC_MESSAGES category does not exist everywhere, but accept it anyway
+	 *
+	 * On Windows, we can't even check the value, so the non-doit case
+	 * is a no-op
 	 */
 #ifdef LC_MESSAGES
 	if (doit)
 	{
-		if (!setlocale(LC_MESSAGES, value))
+		if (!pg_perm_setlocale(LC_MESSAGES, value))
 			return NULL;
 	}
+#ifndef WIN32
 	else
 		value = locale_xxx_assign(LC_MESSAGES, value, false, source);
+#endif   /* WIN32 */
 #endif   /* LC_MESSAGES */
 	return value;
-#else							/* WIN32 */
-
-	/*
-	 * Win32 does not have working setlocale() for LC_MESSAGES. We can only
-	 * use environment variables to change it (per gettext FAQ).  This means
-	 * we can't actually check the supplied value, so always assume it's good.
-	 * Also, ignore attempts to set to "", which really means "keep using the
-	 * old value".  (Actually it means "use the environment value", but we are
-	 * too lazy to try to implement that exactly.)
-	 */
-	if (doit && value[0])
-	{
-		/*
-		 * We need to modify both the process environment and the cached
-		 * version in msvcrt
-		 */
-		static char env[128];
-
-		if (!SetEnvironmentVariable("LC_MESSAGES", value))
-			return NULL;
-
-		snprintf(env, sizeof(env) - 1, "LC_MESSAGES=%s", value);
-		if (_putenv(env))
-			return NULL;
-	}
-	return value;
-#endif   /* WIN32 */
 }
 
 

src/include/utils/pg_locale.h

@@ -2,7 +2,7 @@
  *
  * PostgreSQL locale utilities
  *
- * $PostgreSQL: pgsql/src/include/utils/pg_locale.h,v 1.20 2005/03/16 00:02:49 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/utils/pg_locale.h,v 1.21 2005/12/28 23:22:51 tgl Exp $
  *
  * Copyright (c) 2002-2005, PostgreSQL Global Development Group
  *
@@ -31,6 +31,8 @@ extern const char *locale_numeric_assign(const char *value,
 extern const char *locale_time_assign(const char *value,
 				   bool doit, GucSource source);
 
+extern char *pg_perm_setlocale(int category, const char *locale);
+
 extern bool lc_collate_is_c(void);
 extern bool lc_ctype_is_c(void);