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#! /usr/bin/env python

# Add some standard cpp magic to a header file

import sys

def main():
    args = sys.argv[1:]
    for filename in args:
        process(filename)

def process(filename):
    try:
        f = open(filename, 'r')
    except IOError, msg:
        sys.stderr.write('%s: can\'t open: %s\n' % (filename, str(msg)))
        return
    data = f.read()
    f.close()
    if data[:2] <> '/*':
        sys.stderr.write('%s does not begin with C comment\n' % filename)
        return
    try:
        f = open(filename, 'w')
    except IOError, msg:
        sys.stderr.write('%s: can\'t write: %s\n' % (filename, str(msg)))
        return
    sys.stderr.write('Processing %s ...\n' % filename)
    magic = 'Py_'
    for c in filename:
        if ord(c)<=0x80 and c.isalnum():
            magic = magic + c.upper()
        else: magic = magic + '_'
    sys.stdout = f
    print '#ifndef', magic
    print '#define', magic
    print '#ifdef __cplusplus'
    print 'extern "C" {'
    print '#endif'
    print
    f.write(data)
    print
    print '#ifdef __cplusplus'
    print '}'
    print '#endif'
    print '#endif /*', '!'+magic, '*/'

if __name__ == '__main__':
    main()

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