1 files changed, 75 insertions, 0 deletions
diff --git a/source/tools/acpixtract/axutils.c b/source/tools/acpixtract/axutils.c
index 6af8cdc29a3c9..6d1d0d88346ce 100644
--- a/source/tools/acpixtract/axutils.c
+++ b/source/tools/acpixtract/axutils.c
@@ -46,6 +46,81 @@
 
 /*******************************************************************************
  *
+ * FUNCTION:    AcpiIsValidSignature
+ *
+ * PARAMETERS:  Signature           - Sig string to be validated
+ *
+ * RETURN:      TRUE if signature is has 4 valid ACPI characters
+ *
+ * DESCRIPTION: Validate an ACPI table signature.
+ *
+ ******************************************************************************/
+
+BOOLEAN
+AcpiIsValidSignature (
+    char                    *Signature)
+{
+    UINT32                  i;
+
+
+    /* Validate each character in the signature */
+
+    for (i = 0; i < ACPI_NAME_SIZE; i++)
+    {
+        if (!AcpiUtValidAcpiChar (Signature[i], i))
+        {
+            return (FALSE);
+        }
+    }
+
+    return (TRUE);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiUtValidAcpiChar
+ *
+ * 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
+ *
+ ******************************************************************************/
+
+BOOLEAN
+AcpiUtValidAcpiChar (
+    char                    Character,
+    UINT32                  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:    AxCheckAscii
  *
  * PARAMETERS:  Name                - Ascii string, at least as long as Count