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