-#define ACPI_TOUPPER toupper
-#define ACPI_TOLOWER tolower
-#define ACPI_IS_XDIGIT isxdigit
-#define ACPI_IS_DIGIT isdigit
-#define ACPI_IS_SPACE isspace
-#define ACPI_IS_UPPER isupper
-#define ACPI_IS_PRINT isprint
-#define ACPI_IS_ALPHA isalpha
-#define ACPI_IS_ASCII isascii
+#define ACPI_TOUPPER(i) toupper((int) (i))
+#define ACPI_TOLOWER(i) tolower((int) (i))
+#define ACPI_IS_XDIGIT(i) isxdigit((int) (i))
+#define ACPI_IS_DIGIT(i) isdigit((int) (i))
+#define ACPI_IS_SPACE(i) isspace((int) (i))
+#define ACPI_IS_UPPER(i) isupper((int) (i))
+#define ACPI_IS_PRINT(i) isprint((int) (i))
+#define ACPI_IS_ALPHA(i) isalpha((int) (i))
+
+#else