acpi_extract: Move main code to new function main()

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

scripts/acpi_extract.py

@@ -233,8 +233,19 @@ def aml_package_start(offset):
     offset += 1
     return offset + aml_pkglen_bytes(offset) + 1
 
-lineno = 0
-for line in fileinput.input():
+def get_value_type(maxvalue):
+    #Use type large enough to fit the table
+    if (maxvalue >= 0x10000):
+        return "int"
+    elif (maxvalue >= 0x100):
+        return "short"
+    else:
+        return "char"
+
+def main():
+    global debug
+    lineno = 0
+    for line in fileinput.input():
         # Strip trailing newline
         line = line.rstrip()
         # line number and debug string to output in case of errors
@@ -251,10 +262,10 @@ for line in fileinput.input():
         if (m):
             add_aml(m.group(1), paml.sub("", line))
 
-# Now go over code
-# Track AML offset of a previous non-empty ASL command
-prev_aml_offset = -1
-for i in range(len(asl)):
+    # Now go over code
+    # Track AML offset of a previous non-empty ASL command
+    prev_aml_offset = -1
+    for i in range(len(asl)):
         debug = "input line %d: %s" % (asl[i].lineno, asl[i].line)
 
         l = asl[i].line
@@ -332,19 +343,10 @@ for i in range(len(asl)):
             output[array] = []
         output[array].append(offset)
 
-debug = "at end of file"
+    debug = "at end of file"
 
-def get_value_type(maxvalue):
-    #Use type large enough to fit the table
-    if (maxvalue >= 0x10000):
-        return "int"
-    elif (maxvalue >= 0x100):
-        return "short"
-    else:
-        return "char"
-
-# Pretty print output
-for array in output.keys():
+    # Pretty print output
+    for array in output.keys():
         otype = get_value_type(max(output[array]))
         odata = []
         for value in output[array]:
@@ -352,3 +354,6 @@ for array in output.keys():
         sys.stdout.write("static unsigned %s %s[] = {\n" % (otype, array))
         sys.stdout.write(",\n".join(odata))
         sys.stdout.write('\n};\n')
+
+if __name__ == '__main__':
+    main()