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.

1 files changed, 28 insertions, 1 deletions

diff --git a/src/backend/utils/adt/pg_locale.c b/src/backend/utils/adt/pg_locale.c
index 5b8d8e88102..7c9c774d91b 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 $
  *
  *-----------------------------------------------------------------------
  */
@@ -197,6 +197,33 @@ 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.)
  */