lib:ldb: Add ldb_ascii_toupper()

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15248

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>

2 files changed, 17 insertions, 0 deletions

diff --git a/lib/ldb/common/ldb_utf8.c b/lib/ldb/common/ldb_utf8.c
index a3a328310a7..0184222d126 100644
--- a/lib/ldb/common/ldb_utf8.c
+++ b/lib/ldb/common/ldb_utf8.c
@@ -134,3 +134,7 @@ int ldb_attr_dn(const char *attr)
 	}
 	return -1;
 }
+
+_PRIVATE_ char ldb_ascii_toupper(char c) {
+	return ('a' <= c && c <= 'z') ? c ^ 0x20 : toupper(c);
+}
diff --git a/lib/ldb/include/ldb_private.h b/lib/ldb/include/ldb_private.h
index bcf7770ea93..7d9a47c8ef3 100644
--- a/lib/ldb/include/ldb_private.h
+++ b/lib/ldb/include/ldb_private.h
@@ -317,4 +317,17 @@ int ldb_match_message(struct ldb_context *ldb,
 		      const struct ldb_parse_tree *tree,
 		      enum ldb_scope scope, bool *matched);
 
+/**
+ * @brief Convert a character to uppercase with ASCII precedence.
+ *
+ * This will convert a character to uppercase. If the character is an ASCII
+ * character it will convert it to uppercase ASCII first and then fallback to
+ * localized toupper() from libc.
+ *
+ * @param c The character to convert.
+ *
+ * @return The converted character or c if the conversion was not possible.
+ */
+char ldb_ascii_toupper(char c);
+
 #endif