Chris@43: #!/usr/bin/perl
Chris@43: 
Chris@43: # Transform K&R C function definitions into ANSI equivalent.
Chris@43: #
Chris@43: # Author: Paul Marquess
Chris@43: # Version: 1.0
Chris@43: # Date: 3 October 2006
Chris@43: 
Chris@43: # TODO
Chris@43: #
Chris@43: # Asumes no function pointer parameters. unless they are typedefed.
Chris@43: # Assumes no literal strings that look like function definitions
Chris@43: # Assumes functions start at the beginning of a line
Chris@43: 
Chris@43: use strict;
Chris@43: use warnings;
Chris@43: 
Chris@43: local $/;
Chris@43: $_ = <>;
Chris@43: 
Chris@43: my $sp = qr{ \s* (?: /\* .*? \*/ )? \s* }x; # assume no nested comments
Chris@43: 
Chris@43: my $d1    = qr{ $sp (?: [\w\*\s]+ $sp)* $sp \w+ $sp [\[\]\s]* $sp }x ;
Chris@43: my $decl  = qr{ $sp (?: \w+ $sp )+ $d1 }xo ;
Chris@43: my $dList = qr{ $sp $decl (?: $sp , $d1 )* $sp ; $sp }xo ;
Chris@43: 
Chris@43: 
Chris@43: while (s/^
Chris@43:             (                  # Start $1
Chris@43:                 (              #   Start $2
Chris@43:                     .*?        #     Minimal eat content
Chris@43:                     ( ^ \w [\w\s\*]+ )    #     $3 -- function name
Chris@43:                     \s*        #     optional whitespace
Chris@43:                 )              # $2 - Matched up to before parameter list
Chris@43: 
Chris@43:                 \( \s*         # Literal "(" + optional whitespace
Chris@43:                 ( [^\)]+ )     # $4 - one or more anythings except ")"
Chris@43:                 \s* \)         # optional whitespace surrounding a Literal ")"
Chris@43: 
Chris@43:                 ( (?: $dList )+ ) # $5
Chris@43: 
Chris@43:                 $sp ^ {        # literal "{" at start of line
Chris@43:             )                  # Remember to $1
Chris@43:         //xsom
Chris@43:       )
Chris@43: {
Chris@43:     my $all = $1 ;
Chris@43:     my $prefix = $2;
Chris@43:     my $param_list = $4 ;
Chris@43:     my $params = $5;
Chris@43: 
Chris@43:     StripComments($params);
Chris@43:     StripComments($param_list);
Chris@43:     $param_list =~ s/^\s+//;
Chris@43:     $param_list =~ s/\s+$//;
Chris@43: 
Chris@43:     my $i = 0 ;
Chris@43:     my %pList = map { $_ => $i++ }
Chris@43:                 split /\s*,\s*/, $param_list;
Chris@43:     my $pMatch = '(\b' . join('|', keys %pList) . '\b)\W*$' ;
Chris@43: 
Chris@43:     my @params = split /\s*;\s*/, $params;
Chris@43:     my @outParams = ();
Chris@43:     foreach my $p (@params)
Chris@43:     {
Chris@43:         if ($p =~ /,/)
Chris@43:         {
Chris@43:             my @bits = split /\s*,\s*/, $p;
Chris@43:             my $first = shift @bits;
Chris@43:             $first =~ s/^\s*//;
Chris@43:             push @outParams, $first;
Chris@43:             $first =~ /^(\w+\s*)/;
Chris@43:             my $type = $1 ;
Chris@43:             push @outParams, map { $type . $_ } @bits;
Chris@43:         }
Chris@43:         else
Chris@43:         {
Chris@43:             $p =~ s/^\s+//;
Chris@43:             push @outParams, $p;
Chris@43:         }
Chris@43:     }
Chris@43: 
Chris@43: 
Chris@43:     my %tmp = map { /$pMatch/;  $_ => $pList{$1}  }
Chris@43:               @outParams ;
Chris@43: 
Chris@43:     @outParams = map  { "    $_" }
Chris@43:                  sort { $tmp{$a} <=> $tmp{$b} }
Chris@43:                  @outParams ;
Chris@43: 
Chris@43:     print $prefix ;
Chris@43:     print "(\n" . join(",\n", @outParams) . ")\n";
Chris@43:     print "{" ;
Chris@43: 
Chris@43: }
Chris@43: 
Chris@43: # Output any trailing code.
Chris@43: print ;
Chris@43: exit 0;
Chris@43: 
Chris@43: 
Chris@43: sub StripComments
Chris@43: {
Chris@43: 
Chris@43:   no warnings;
Chris@43: 
Chris@43:   # Strip C & C++ coments
Chris@43:   # From the perlfaq
Chris@43:   $_[0] =~
Chris@43: 
Chris@43:     s{
Chris@43:        /\*         ##  Start of /* ... */ comment
Chris@43:        [^*]*\*+    ##  Non-* followed by 1-or-more *'s
Chris@43:        (
Chris@43:          [^/*][^*]*\*+
Chris@43:        )*          ##  0-or-more things which don't start with /
Chris@43:                    ##    but do end with '*'
Chris@43:        /           ##  End of /* ... */ comment
Chris@43: 
Chris@43:      |         ##     OR  C++ Comment
Chris@43:        //          ## Start of C++ comment //
Chris@43:        [^\n]*      ## followed by 0-or-more non end of line characters
Chris@43: 
Chris@43:      |         ##     OR  various things which aren't comments:
Chris@43: 
Chris@43:        (
Chris@43:          "           ##  Start of " ... " string
Chris@43:          (
Chris@43:            \\.           ##  Escaped char
Chris@43:          |               ##    OR
Chris@43:            [^"\\]        ##  Non "\
Chris@43:          )*
Chris@43:          "           ##  End of " ... " string
Chris@43: 
Chris@43:        |         ##     OR
Chris@43: 
Chris@43:          '           ##  Start of ' ... ' string
Chris@43:          (
Chris@43:            \\.           ##  Escaped char
Chris@43:          |               ##    OR
Chris@43:            [^'\\]        ##  Non '\
Chris@43:          )*
Chris@43:          '           ##  End of ' ... ' string
Chris@43: 
Chris@43:        |         ##     OR
Chris@43: 
Chris@43:          .           ##  Anything other char
Chris@43:          [^/"'\\]*   ##  Chars which doesn't start a comment, string or escape
Chris@43:        )
Chris@43:      }{$2}gxs;
Chris@43: 
Chris@43: }