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#!/usr/bin/python3
import sys
import os
import re
ifndef = re.compile('^\#ifndef')
define = re.compile('^\#define')
endif = re.compile('^\#endif')
name = sys.argv[1]
bak_name = name + ".bak"
new_guard_name = name.replace('/', '_').replace('.', '_').upper()
new_guard_name += "_"
try:
os.rename(name, bak_name)
input = file(bak_name, 'r')
output = file(name, 'w')
for line in input:
m = ifndef.search(line)
if m is not None:
output.write('#ifndef ' + new_guard_name + '\n')
continue
m = define.search(line)
if m is not None:
output.write('#define ' + new_guard_name + '\n')
continue
m = endif.search(line)
if m is not None:
output.write('#endif // ' + new_guard_name + '\n')
continue
output.write(line)
input.close()
output.close()
except IOError:
sys.stderr.write('Cannot open "%s"\n' % arg)
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