#!/usr/bin/perl
#
# Copyright (c) 1992, 1993
#	The Regents of the University of California.  All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#	This product includes software developed by the University of
#	California, Berkeley and its contributors.
# 4. Neither the name of the University nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# From @(#)vnode_if.sh	8.1 (Berkeley) 6/10/93
# From @(#)makedevops.sh 1.1 1998/06/14 13:53:12 dfr Exp $
# From @(#)makedevops.sh ?.? 1998/10/05

#
# Script to produce device front-end sugar.
#

$debug = 0;
$cfile = 0;          # by default do not produce any file type
$hfile = 0;

$keepcurrentdir = 1;

$line_width = 80;

use File::Basename;

# Process the command line
#
while ( $arg = shift @ARGV ) {
   if ( $arg eq '-c' ) {
      warn "Producing .c output files"
         if $debug;
      $cfile = 1;
   } elsif ( $arg eq '-h' ) {
      warn "Producing .h output files"
         if $debug;
      $hfile = 1;
   } elsif ( $arg eq '-ch' || $arg eq '-hc' ) {
      warn "Producing .c and .h output files"
         if $debug;
      $cfile = 1;
      $hfile = 1;
   } elsif ( $arg eq '-d' ) {
      $debug = 1;
   } elsif ( $arg eq '-p' ) {
      warn "Will produce files in original not in current directory"
         if $debug;
      $keepcurrentdir = 0;
   } elsif ( $arg eq '-l' ) {
      if ( $line_width = shift @ARGV and $line_width > 0 ) {
         warn "Line width set to $line_width"
            if $debug;
      } else {
         die "Please specify a valid line width after -l";
      }
   } elsif ( $arg =~ m/\.m$/ ) {
      warn "Filename: $arg"
         if $debug;
      push @filenames, $arg;
   } else {
      warn "$arg ignored"
         if $debug;
   }
}


# Validate the command line parameters
#
die "usage: $0 [-d] [-p] [-c|-h] srcfile
where -c   produce only .c files
      -h   produce only .h files
      -p   use the path component in the source file for destination dir
      -l   set line width for output files [80]
      -d   switch on debugging
"
	unless ($cfile or $hfile)
	   and $#filenames != -1;

# FIXME should be able to do this more easily
#
$tmpdir = $ENV{'TMPDIR'};           # environment variables
$tmpdir = $ENV{'TMP'}
   if !$tmpdir;
$tmpdir = $ENV{'TEMP'}
   if !$tmpdir;
$tmpdir = '/tmp'                    # look for a physical directory
   if !$tmpdir and -d '/tmp';
$tmpdir = '/usr/tmp'
   if !$tmpdir and -d '/usr/tmp';
$tmpdir = '/var/tmp'
   if !$tmpdir and -d '/var/tmp';
$tmpdir = '.'                       # give up and use current dir
   if !$tmpdir;

foreach $src ( @filenames ) {
   # Names of the created files
   $ctmpname = "$tmpdir/ctmp.$$";
   $htmpname = "$tmpdir/htmp.$$";

   ($name, $path, $suffix) = &fileparse($src, '.m');
   $path = '.'
      if $keepcurrentdir;
   $cfilename="$path/$name.c";
   $hfilename="$path/$name.h";

   warn "Processing from $src to $cfile / $hfile via $ctmp / $htmp"
      if $debug;

   die "Could not open $src, $!"
      if !open SRC, "$src";
   die "Could not open $ctmpname, $!"
      if $cfile and !open CFILE, ">$ctmpname";
   die "Could not open $htmpname, $!"
      if $hfile and !open HFILE, ">$htmpname";

   if ( $cfile ) {
      # Produce the header of the C file
      #
      print CFILE "/*\n";
      print CFILE " * This file is produced automatically.\n";
      print CFILE " * Do not modify anything in here by hand.\n";
      print CFILE " *\n";
      print CFILE " * Created from\n";
      print CFILE " *   $src\n";
      print CFILE " * with\n";
      print CFILE " *   $0\n";
      print CFILE " */\n";
      print CFILE "\n";
      print CFILE "#include <sys/param.h>\n";
      print CFILE "#include <sys/queue.h>\n";
      print CFILE "#include <sys/bus_private.h>\n";
   }

   if ( $hfile ) {
      # Produce the header of the H file
      #
      print HFILE "/*\n";
      print HFILE " * This file is produced automatically.\n";
      print HFILE " * Do not modify anything in here by hand.\n";
      print HFILE " *\n";
      print HFILE " * Created from\n";
      print HFILE " *   $src\n";
      print HFILE " * with\n";
      print HFILE " *   $0\n";
      print HFILE " */\n";
      print HFILE "\n";
   }

   %methods = ();    # clear list of methods
   $lineno = 0;
   $error = 0;       # to signal clean up and gerror setting

   LINE: while ( $line = <SRC> ) {
      $lineno++;

      # take special notice of include directives.
      #
      if ( $line =~ m/^#\s*include\s+(["<])([^">]+)([">]).*/i ) {
         warn "Included file: $1$2" . ($1 eq '<'? '>':'"')
            if $debug;
         print CFILE "#include $1$2" . ($1 eq '<'? '>':'"') . "\n"
            if $cfile;
      }

      $line =~ s/#.*//;                # remove comments
      $line =~ s/^\s+//;               # remove leading ...
      $line =~ s/\s+$//;               # remove trailing whitespace

      if ( $line =~ m/^$/ ) {          # skip empty lines
         # nop

      } elsif ( $line =~ m/^INTERFACE\s*([^\s;]*)(\s*;?)/i ) {
         $intname = $1;
         $semicolon = $2;
         unless ( $intname =~ m/^[a-z_][a-z0-9_]*$/ ) {
            warn $line
               if $debug;
            warn "$src:$lineno: Invalid interface name '$intname', use [a-z_][a-z0-9_]*";
            $error = 1;
            last LINE;
         }

         warn "$src:$lineno: semicolon missing at end of line, no problem"
            if $semicolon !~ s/;$//;

         warn "Interface $intname"
            if $debug;

         print HFILE '#ifndef _'.$intname."_if_h_\n"
            if $hfile;
         print HFILE '#define _'.$intname."_if_h_\n\n"
            if $hfile;
         print CFILE '#include "'.$intname.'_if.h"'."\n\n"
            if $cfile;

      } elsif ( $line =~ m/^METHOD/i ) {
         # Get the return type function name and delete that from
         # the line. What is left is the possibly first function argument
         # if it is on the same line.
         #
         # FIXME For compatibilities sake METHOD and METHODE is accepted.
         #
         if ( !$intname ) {
            warn "$src:$lineno: No interface name defined";
            $error = 1;
            last LINE;
         }
         $line =~ s/^METHODE?\s+([^{]+?)\s*{\s*//i;
         @ret = split m/\s+/, $1;
         $name = pop @ret;          # last element is name of method
         $ret = join(" ", @ret);    # return type

         warn "Method: name=$name return type=$ret"
            if $debug;
         
         if ( !$name or !$ret ) {
            warn $line
               if $debug;
            warn "$src:$lineno: Invalid method specification";
            $error = 1;
            last LINE;
         }

         unless ( $name =~ m/^[a-z_][a-z_0-9]*$/ ) {
            warn $line
               if $debug;
            warn "$src:$lineno: Invalid method name '$name', use [a-z_][a-z0-9_]*";
            $error = 1;
            last LINE;
         }

         if ( defined($methods{$name}) ) {
            warn "$src:$lineno: Duplicate method name";
            $error = 1;
            last LINE;
         }

         $methods{$name} = 'VIS';

         while ( $line !~ m/}/ and $line .= <SRC> ) { }

         if ( $line !~ s/};?(.*)// ) { # remove first '}' and trailing garbage
            # The '}' was not there (the rest is optional), so complain
            warn "$src:$lineno: Premature end of file";
            $error = 1;
            last LINE;
         }
         warn "$src:$lineno: Ignored '$1'"  # warn about garbage at end of line
            if $debug and $1;

         # Create a list of variables without the types prepended
         #
         $line =~ s/^\s+//;            # remove leading ...
         $line =~ s/\s+$//;            # ... and trailing whitespace
         $line =~ s/\s+/ /;            # remove double spaces

         @arguments = split m/\s*;\s*/, $line;
         @varnames = ();               # list of varnames
         foreach $argument (@arguments) {
            next                       # skip argument if argument is empty
               if !$argument;

            @ar = split m/[*\s]+/, $argument;
            if ( $#ar == 0 ) {         # only 1 word in argument?
               warn "$src:$lineno: no type for '$argument'";
               $error = 1;
               last LINE;
            }

            push @varnames, $ar[-1];   # last element is name of variable
         };

         warn 'Arguments: ' . join(', ', @arguments) . "\n"
            . 'Varnames: ' . join(', ', @varnames)
            if $debug;

         $mname = $intname.'_'.$name;  # method name
         $umname = uc($mname);         # uppercase method name

         $arguments = join(", ", @arguments);
         $varnames = join(", ", @varnames);

         if ( $hfile ) {
            # the method description 
            print HFILE "extern struct device_op_desc $mname\_desc;\n";
            # the method typedef
            print HFILE &format_line("typedef $ret $mname\_t($arguments);",
                              $line_width, ', ',
                              ',',' ' x length("typedef $ret $mname\_t("))
                      . "\n";
            # the method declaration
            print HFILE "$mname\_t $umname;\n\n";
         }

         if ( $cfile ) {
            # Print out the method desc
            print CFILE "struct device_op_desc $mname\_desc = {\n";
            print CFILE "\t0, \"$mname\"\n";
            print CFILE "};\n\n";

            # Print out the method itself
            if ( 0 ) {                 # haven't chosen the format yet
               print CFILE "$ret $umname($varnames)\n";
               print CFILE "\t".join(";\n\t", @arguments).";\n";
            } else {
               print CFILE &format_line("$ret $umname($arguments)",
                              $line_width, ', ',
                              ',', ' ' x length("$ret $umname(")) . "\n";
            }
            print CFILE "{\n";
            print CFILE &format_line("\t$mname\_t *m = ($mname\_t *) DEVOPMETH(dev, $mname);",
                              $line_width-8, ' = ', ' =', "\t\t")
                      . "\n";
            print CFILE "\t".($ret eq 'void'? '':'return ') . "m($varnames);\n";
            print CFILE "}\n\n";
         }
      } else {
         warn $line
            if $debug;
         warn "$src:$lineno: Invalid line encountered";
         $error = 1;
         last LINE;
      }
   } # end LINE

   # print the final '#endif' in the header file
   #
   print HFILE "#endif /* _".$intname."_if_h_ */\n"
      if $hfile;

   close SRC;
   close CFILE
      if $cfile;
   close HFILE
      if $hfile;

   if ( !$error ) {
      if ( $cfile ) {
         ($rc = system("mv $ctmpname $cfilename"))
            and warn "mv $ctmpname $cfilename failed, $rc";
      }

      if ( $hfile ) {
         ($rc = system("mv $htmpname $hfilename"))
            and warn "mv $htmpname $hfilename failed, $rc";
      }
   } else {
      warn 'File' . ($hfile and $cfile? 's':'') . ' skipped';
      ($rc = system("rm -f $htmpname $ctmpname"))
         and warn "rm -f $htmpname $ctmpname failed, $rc";
      $gerror = 1;
   }
}

exit $gerror;


sub format_line {
   my ($line, $maxlength, $break, $new_end, $new_start) = @_;
   my $rline = "";

   while ( length($line) > $maxlength
           and ($i = rindex $line, $break, $maxlength-length($new_end)) != -1 ) {
      $rline .= substr($line, 0, $i) . $new_end . "\n";
      $line = $new_start . substr($line, $i+length($break));
   }

   return $rline . $line;
}
