1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/utascii.c b/drivers/acpi/acpica/utascii.c
new file mode 100644
index 000000000..72fb7e9ec
--- /dev/null
+++ b/drivers/acpi/acpica/utascii.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: utascii - Utility ascii functions
+ *
+ * Copyright (C) 2000 - 2022, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_valid_nameseg
+ *
+ * PARAMETERS:  name            - The name or table signature to be examined.
+ *                                Four characters, does not have to be a
+ *                                NULL terminated string.
+ *
+ * RETURN:      TRUE if signature is has 4 valid ACPI characters
+ *
+ * DESCRIPTION: Validate an ACPI table signature.
+ *
+ ******************************************************************************/
+
+u8 acpi_ut_valid_nameseg(char *name)
+{
+	u32 i;
+
+	/* Validate each character in the signature */
+
+	for (i = 0; i < ACPI_NAMESEG_SIZE; i++) {
+		if (!acpi_ut_valid_name_char(name[i], i)) {
+			return (FALSE);
+		}
+	}
+
+	return (TRUE);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_valid_name_char
+ *
+ * PARAMETERS:  char            - The character to be examined
+ *              position        - Byte position (0-3)
+ *
+ * RETURN:      TRUE if the character is valid, FALSE otherwise
+ *
+ * DESCRIPTION: Check for a valid ACPI character. Must be one of:
+ *              1) Upper case alpha
+ *              2) numeric
+ *              3) underscore
+ *
+ *              We allow a '!' as the last character because of the ASF! table
+ *
+ ******************************************************************************/
+
+u8 acpi_ut_valid_name_char(char character, u32 position)
+{
+
+	if (!((character >= 'A' && character <= 'Z') ||
+	      (character >= '0' && character <= '9') || (character == '_'))) {
+
+		/* Allow a '!' in the last position */
+
+		if (character == '!' && position == 3) {
+			return (TRUE);
+		}
+
+		return (FALSE);
+	}
+
+	return (TRUE);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_check_and_repair_ascii
+ *
+ * PARAMETERS:  name                - Ascii string
+ *              count               - Number of characters to check
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Ensure that the requested number of characters are printable
+ *              Ascii characters. Sets non-printable and null chars to <space>.
+ *
+ ******************************************************************************/
+
+void acpi_ut_check_and_repair_ascii(u8 *name, char *repaired_name, u32 count)
+{
+	u32 i;
+
+	for (i = 0; i < count; i++) {
+		repaired_name[i] = (char)name[i];
+
+		if (!name[i]) {
+			return;
+		}
+		if (!isprint(name[i])) {
+			repaired_name[i] = ' ';
+		}
+	}
+}