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+#!/usr/bin/perl
+
+# Transform K&R C function definitions into ANSI equivalent.
+#
+# Author: Paul Marquess
+# Version: 1.0
+# Date: 3 October 2006
+
+# TODO
+#
+# Asumes no function pointer parameters. unless they are typedefed.
+# Assumes no literal strings that look like function definitions
+# Assumes functions start at the beginning of a line
+
+use strict;
+use warnings;
+
+local $/;
+$_ = <>;
+
+my $sp = qr{ \s* (?: /\* .*? \*/ )? \s* }x; # assume no nested comments
+
+my $d1 = qr{ $sp (?: [\w\*\s]+ $sp)* $sp \w+ $sp [\[\]\s]* $sp }x ;
+my $decl = qr{ $sp (?: \w+ $sp )+ $d1 }xo ;
+my $dList = qr{ $sp $decl (?: $sp , $d1 )* $sp ; $sp }xo ;
+
+
+while (s/^
+ ( # Start $1
+ ( # Start $2
+ .*? # Minimal eat content
+ ( ^ \w [\w\s\*]+ ) # $3 -- function name
+ \s* # optional whitespace
+ ) # $2 - Matched up to before parameter list
+
+ \( \s* # Literal "(" + optional whitespace
+ ( [^\)]+ ) # $4 - one or more anythings except ")"
+ \s* \) # optional whitespace surrounding a Literal ")"
+
+ ( (?: $dList )+ ) # $5
+
+ $sp ^ { # literal "{" at start of line
+ ) # Remember to $1
+ //xsom
+ )
+{
+ my $all = $1 ;
+ my $prefix = $2;
+ my $param_list = $4 ;
+ my $params = $5;
+
+ StripComments($params);
+ StripComments($param_list);
+ $param_list =~ s/^\s+//;
+ $param_list =~ s/\s+$//;
+
+ my $i = 0 ;
+ my %pList = map { $_ => $i++ }
+ split /\s*,\s*/, $param_list;
+ my $pMatch = '(\b' . join('|', keys %pList) . '\b)\W*$' ;
+
+ my @params = split /\s*;\s*/, $params;
+ my @outParams = ();
+ foreach my $p (@params)
+ {
+ if ($p =~ /,/)
+ {
+ my @bits = split /\s*,\s*/, $p;
+ my $first = shift @bits;
+ $first =~ s/^\s*//;
+ push @outParams, $first;
+ $first =~ /^(\w+\s*)/;
+ my $type = $1 ;
+ push @outParams, map { $type . $_ } @bits;
+ }
+ else
+ {
+ $p =~ s/^\s+//;
+ push @outParams, $p;
+ }
+ }
+
+
+ my %tmp = map { /$pMatch/; $_ => $pList{$1} }
+ @outParams ;
+
+ @outParams = map { " $_" }
+ sort { $tmp{$a} <=> $tmp{$b} }
+ @outParams ;
+
+ print $prefix ;
+ print "(\n" . join(",\n", @outParams) . ")\n";
+ print "{" ;
+
+}
+
+# Output any trailing code.
+print ;
+exit 0;
+
+
+sub StripComments
+{
+
+ no warnings;
+
+ # Strip C & C++ coments
+ # From the perlfaq
+ $_[0] =~
+
+ s{
+ /\* ## Start of /* ... */ comment
+ [^*]*\*+ ## Non-* followed by 1-or-more *'s
+ (
+ [^/*][^*]*\*+
+ )* ## 0-or-more things which don't start with /
+ ## but do end with '*'
+ / ## End of /* ... */ comment
+
+ | ## OR C++ Comment
+ // ## Start of C++ comment //
+ [^\n]* ## followed by 0-or-more non end of line characters
+
+ | ## OR various things which aren't comments:
+
+ (
+ " ## Start of " ... " string
+ (
+ \\. ## Escaped char
+ | ## OR
+ [^"\\] ## Non "\
+ )*
+ " ## End of " ... " string
+
+ | ## OR
+
+ ' ## Start of ' ... ' string
+ (
+ \\. ## Escaped char
+ | ## OR
+ [^'\\] ## Non '\
+ )*
+ ' ## End of ' ... ' string
+
+ | ## OR
+
+ . ## Anything other char
+ [^/"'\\]* ## Chars which doesn't start a comment, string or escape
+ )
+ }{$2}gxs;
+
+}