From 494f30c95370cae30984a5f6ec6c200065c64919 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Wed, 16 Mar 2005 00:02:49 +0000
Subject: Prevent locale-aware handling of upper, lower, and initcap when the
 locale is C.

Backpatch to 8.0.X because some operating systems were throwing errors
for such operations, rather than ignoring the locale when it was C.
---
 src/backend/utils/adt/pg_locale.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

(limited to 'src/backend/utils/adt/pg_locale.c')

diff --git a/src/backend/utils/adt/pg_locale.c b/src/backend/utils/adt/pg_locale.c
index 5b8d8e8810..7c9c774d91 100644
--- a/src/backend/utils/adt/pg_locale.c
+++ b/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 1.30 2005/01/01 05:43:07 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/adt/pg_locale.c,v 1.31 2005/03/16 00:02:49 momjian Exp $
  *
  *-----------------------------------------------------------------------
  */
@@ -196,6 +196,33 @@ lc_collate_is_c(void)
 }
 
 
+/*
+ * We'd like to cache whether LC_CTYPE is C (or POSIX), so we can
+ * optimize a few code paths in various places.
+ */
+bool
+lc_ctype_is_c(void)
+{
+	/* Cache result so we only have to compute it once */
+	static int	result = -1;
+	char	   *localeptr;
+
+	if (result >= 0)
+		return (bool) result;
+	localeptr = setlocale(LC_CTYPE, NULL);
+	if (!localeptr)
+		elog(ERROR, "invalid LC_CTYPE setting");
+
+	if (strcmp(localeptr, "C") == 0)
+		result = true;
+	else if (strcmp(localeptr, "POSIX") == 0)
+		result = true;
+	else
+		result = false;
+	return (bool) result;
+}
+
+
 /*
  * Frees the malloced content of a struct lconv.  (But not the struct
  * itself.)
-- 
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