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# drop if don't start with typedef
/^\s*typedef/ ! b
# one line typedef xxx (...); we are done
s/^\s*typedef\s+(.*)(\(\*?\w+\))?\s*(\(.*\));.*$/typedef \1 \2 \3;/
t finish
# if ends with ,
s/^\s*typedef\s+(.*)(\(\*?\w+\))?\s*(\(.*,)/typedef \1 \2 \3/
# drop if substitution fail, copy pattern to hold space
T;h
:loop;n
# append each parameters
/,$/ { H; b loop }
# when ; reached, append a swap hold space to pattern space
/;.*$/ { H;x}
:finish
# drop \n
s/\n//g
# replace multi spaces with one
s/ {2,}/ /g
p
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