scripts/kernel-doc

#!/usr/bin/perl -w

use strict;

## Copyright (c) 1998 Michael Zucchi, All Rights Reserved ##
## Copyright (C) 2000, 1 Tim Waugh <twaugh@redhat.com> ##
## Copyright (C) 2001 Simon Huggins ##
## Copyright (C) 2005-2008 Randy Dunlap ##
## ##
## #define enhancements by Armin Kuster <akuster@mvista.com> ##
## Copyright (c) 2000 MontaVista Software, Inc. ##
## ##
## This software falls under the GNU General Public License. ##
## Please read the COPYING file for more information ##

# w.o. 03-11-2000: added the '-filelist' option.

# 18/01/2001 -	Cleanups
#	Functions prototyped as foo(void) same as foo()
#	Stop eval'ing where we don't need to.
# -- huggie@earth.li

# 27/06/2001 - Allowed whitespace after initial "/**" and
# allowed comments before function declarations.
# -- Christian Kreibich <ck@whoop.org>

# Still to do:
#	- add perldoc documentation
#	- Look more closely at some of the scarier bits :)

# 26/05/2001 -	Support for separate source and object trees.
#	Return error code.
#	Keith Owens <kaos@ocs.com.au>

# 23/09/2001 - Added support for typedefs, structs, enums and unions
# Support for Context section; can be terminated using empty line
# Small fixes (like spaces vs. \s in regex)
# -- Tim Jansen <tim@tjansen.de>


#
# This will read a 'c' file and scan for embedded comments in the
# style of gnome comments (+minor extensions - see below).
#

# Note: This only supports 'c'.

# usage:
# kernel-doc [ -docbook | -html | -text | -man ] [ -no-doc-sections ]
# [ -function funcname [ -function funcname ...] ] c file(s)s > outputfile
# or
# [ -nofunction funcname [ -function funcname ...] ] c file(s)s > outputfile
#
# Set output format using one of -docbook -html -text or -man. Default is man.
#
# -no-doc-sections
#	Do not output DOC: sections
#
# -function funcname
#	If set, then only generate documentation for the given function(s) or
#	DOC: section titles. All other functions and DOC: sections are ignored.
#
# -nofunction funcname
#	If set, then only generate documentation for the other function(s)/DOC:
#	sections. Cannot be used together with -function (yes, that's a bug --
#	perl hackers can fix it 8))
#
# c files - list of 'c' files to process
#
# All output goes to stdout, with errors to stderr.

#
# format of comments.
# In the following table, (...)? signifies optional structure.
# (...)* signifies 0 or more structure elements
# /**
# * function_name(:)? (- short description)?
# (* @parameterx: (description of parameter x)?)*
# (* a blank line)?
# * (Description:)? (Description of function)?
# * (section header: (section description)? )*
# (*)?*/
#
# So .. the trivial example would be:
#
# /**
# * my_function
# **/
#
# If the Description: header tag is omitted, then there must be a blank line
# after the last parameter specification.
# e.g.
# /**
# * my_function - does my stuff
# * @my_arg: its mine damnit
# *
# * Does my stuff explained.
# */
#
# or, could also use:
# /**
# * my_function - does my stuff
# * @my_arg: its mine damnit
# * Description: Does my stuff explained.
# */
# etc.
#
# Beside functions you can also write documentation for structs, unions,
# enums and typedefs. Instead of the function name you must write the name
# of the declaration; the struct/union/enum/typedef must always precede
# the name. Nesting of declarations is not supported.
# Use the argument mechanism to document members or constants.
# e.g.
# /**
# * struct my_struct - short description
# * @a: first member
# * @b: second member
# *
# * Longer description
# */
# struct my_struct {
# int a;
# int b;
# /* private: */
# int c;
# };
#
# All descriptions can be multiline, except the short function description.
#
# You can also add additional sections. When documenting kernel functions you
# should document the "Context:" of the function, e.g. whether the functions
# can be called form interrupts. Unlike other sections you can end it with an
# empty line.
# Example-sections should contain the string EXAMPLE so that they are marked
# appropriately in DocBook.
#
# Example:
# /**
# * user_function - function that can only be called in user context
# * @a: some argument
# * Context: !in_interrupt()
# *
# * Some description
# * Example:
# * user_function(22);
# */
# ...
#
#
# All descriptive text is further processed, scanning for the following special
# patterns, which are highlighted appropriately.
#
# 'funcname()' - function
# '$ENVVAR' - environmental variable
# '&struct_name' - name of a structure (up to two words including 'struct')
# '@parameter' - name of a parameter
# '%CONST' - name of a constant.

my $errors = 0;
my $warnings = 0;
my $anon_struct_union = 0;

# match expressions used to find embedded type information
my $type_constant = '\%([-_\w]+)';
my $type_func = '(\w+)\(\)';
my $type_param = '\@(\w+)';
my $type_struct = '\&((struct\s*)*[_\w]+)';
my $type_struct_xml = '\\&amp;((struct\s*)*[_\w]+)';
my $type_env = '(\$\w+)';

# Output conversion substitutions.
# One for each output format

# these work fairly well
my %highlights_html = ( $type_constant, "<i>\$1</i>",
$type_func, "<b>\$1</b>",
$type_struct_xml, "<i>\$1</i>",
$type_env, "<b><i>\$1</i></b>",
$type_param, "<tt><b>\$1</b></tt>" );
my $local_lt = "\\\\\\\\lt:";
my $local_gt = "\\\\\\\\gt:";
my $blankline_html = $local_lt . "p" . $local_gt;# was "<p>"

# XML, docbook format
my %highlights_xml = ( "([^=])\\\"([^\\\"<]+)\\\"", "\$1<quote>\$2</quote>",
$type_constant, "<constant>\$1</constant>",
$type_func, "<function>\$1</function>",
$type_struct_xml, "<structname>\$1</structname>",
$type_env, "<envar>\$1</envar>",
$type_param, "<parameter>\$1</parameter>" );
my $blankline_xml = $local_lt . "/para" . $local_gt . $local_lt . "para" . $local_gt . "\n";

# gnome, docbook format
my %highlights_gnome = ( $type_constant, "<replaceable class=\"option\">\$1</replaceable>",
 $type_func, "<function>\$1</function>",
 $type_struct, "<structname>\$1</structname>",
 $type_env, "<envar>\$1</envar>",
 $type_param, "<parameter>\$1</parameter>" );
my $blankline_gnome = "</para><para>\n";

# these are pretty rough
my %highlights_man = ( $type_constant, "\$1",
 $type_func, "\\\\fB\$1\\\\fP",
 $type_struct, "\\\\fI\$1\\\\fP",
 $type_param, "\\\\fI\$1\\\\fP" );
my $blankline_man = "";

# text-mode
my %highlights_text = ( $type_constant, "\$1",
$type_func, "\$1",
$type_struct, "\$1",
$type_param, "\$1" );
my $blankline_text = "";


sub usage {
 print "Usage: $0 [ -v ] [ -docbook | -html | -text | -man ] [ -no-doc-sections ]\n";
 print " [ -function funcname [ -function funcname ...] ]\n";
 print " [ -nofunction funcname [ -nofunction funcname ...] ]\n";
 print " c source file(s) > outputfile\n";
 print " -v : verbose output, more warnings & other info listed\n";
 exit 1;
}

# read arguments
if ($#ARGV==-1) {
 usage();
}

my $verbose = 0;
my $output_mode = "man";
my $no_doc_sections = 0;
my %highlights = %highlights_man;
my $blankline = $blankline_man;
my $modulename = "Kernel API";
my $function_only = 0;
my $man_date = ('January', 'February', 'March', 'April', 'May', 'June',
'July', 'August', 'September', 'October',
'November', 'December')[(localtime)[4]] .
 " " . ((localtime)[5]+1900);

# Essentially these are globals
# They probably want to be tidied up made more localised or summat.
# CAVEAT EMPTOR! Some of the others I localised may not want to be which
# could cause "use of undefined value" or other bugs.
my ($function, %function_table,%parametertypes,$declaration_purpose);
my ($type,$declaration_name,$return_type);
my ($newsection,$newcontents,$prototype,$filelist, $brcount, %source_map);

if (defined($ENV{'KBUILD_VERBOSE'})) {
$verbose = "$ENV{'KBUILD_VERBOSE'}";
}

# Generated docbook code is inserted in a template at a point where
# docbook v3.1 requires a non-zero sequence of RefEntry's; see:
# http://www.oasis-open.org/docbook/documentation/reference/html/refentry.html
# We keep track of number of generated entries and generate a dummy
# if needs be to ensure the expanded template can be postprocessed
# into html.
my $section_counter = 0;

my $lineprefix="";

# states
# 0 - normal code
# 1 - looking for function name
# 2 - scanning field start.
# 3 - scanning prototype.
# 4 - documentation block
my $state;
my $in_doc_sect;

#declaration types: can be
# 'function', 'struct', 'union', 'enum', 'typedef'
my $decl_type;

my $doc_special = "\@\%\$\&";

my $doc_start = '^/\*\*\s*$'; # Allow whitespace at end of comment start.
my $doc_end = '\*/';
my $doc_com = '\s*\*\s*';
my $doc_decl = $doc_com.'(\w+)';
my $doc_sect = $doc_com.'(['.$doc_special.']?[\w\s]+):(.*)';
my $doc_content = $doc_com.'(.*)';
my $doc_block = $doc_com.'DOC:\s*(.*)?';

my %constants;
my %parameterdescs;
my @parameterlist;
my %sections;
my @sectionlist;
my $sectcheck;
my $struct_actual;

my $contents = "";
my $section_default = "Description";# default section
my $section_intro = "Introduction";
my $section = $section_default;
my $section_context = "Context";

my $undescribed = "-- undescribed --";

reset_state();

while ($ARGV[0] =~ m/^-(.*)/) {
 my $cmd = shift @ARGV;
 if ($cmd eq "-html") {
$output_mode = "html";
%highlights = %highlights_html;
$blankline = $blankline_html;
 } elsif ($cmd eq "-man") {
$output_mode = "man";
%highlights = %highlights_man;
$blankline = $blankline_man;
 } elsif ($cmd eq "-text") {
$output_mode = "text";
%highlights = %highlights_text;
$blankline = $blankline_text;
 } elsif ($cmd eq "-docbook") {
$output_mode = "xml";
%highlights = %highlights_xml;
$blankline = $blankline_xml;
 } elsif ($cmd eq "-gnome") {
$output_mode = "gnome";
%highlights = %highlights_gnome;
$blankline = $blankline_gnome;
 } elsif ($cmd eq "-module") { # not needed for XML, inherits from calling document
$modulename = shift @ARGV;
 } elsif ($cmd eq "-function") { # to only output specific functions
$function_only = 1;
$function = shift @ARGV;
$function_table{$function} = 1;
 } elsif ($cmd eq "-nofunction") { # to only output specific functions
$function_only = 2;
$function = shift @ARGV;
$function_table{$function} = 1;
 } elsif ($cmd eq "-v") {
$verbose = 1;
 } elsif (($cmd eq "-h") || ($cmd eq "--help")) {
usage();
 } elsif ($cmd eq '-filelist') {
 $filelist = shift @ARGV;
 } elsif ($cmd eq '-no-doc-sections') {
 $no_doc_sections = 1;
 }
}

# get kernel version from env
sub get_kernel_version() {
 my $version = 'unknown kernel version';

 if (defined($ENV{'KERNELVERSION'})) {
$version = $ENV{'KERNELVERSION'};
 }
 return $version;
}
my $kernelversion = get_kernel_version();

# generate a sequence of code that will splice in highlighting information
# using the s// operator.
my $dohighlight = "";
foreach my $pattern (keys %highlights) {
# print STDERR "scanning pattern:$pattern, highlight:($highlights{$pattern})\n";
 $dohighlight .= "\$contents =~ s:$pattern:$highlights{$pattern}:gs;\n";
}

##
# dumps section contents to arrays/hashes intended for that purpose.
#
sub dump_section {
 my $file = shift;
 my $name = shift;
 my $contents = join "\n", @_;

 if ($name =~ m/$type_constant/) {
$name = $1;
#	print STDERR "constant section '$1' = '$contents'\n";
$constants{$name} = $contents;
 } elsif ($name =~ m/$type_param/) {
#	print STDERR "parameter def '$1' = '$contents'\n";
$name = $1;
$parameterdescs{$name} = $contents;
$sectcheck = $sectcheck . $name . " ";
 } elsif ($name eq "@\.\.\.") {
#	print STDERR "parameter def '...' = '$contents'\n";
$name = "...";
$parameterdescs{$name} = $contents;
$sectcheck = $sectcheck . $name . " ";
 } else {
#	print STDERR "other section '$name' = '$contents'\n";
if (defined($sections{$name}) && ($sections{$name} ne "")) {
print STDERR "Error(${file}:$.): duplicate section name '$name'\n";
++$errors;
}
$sections{$name} = $contents;
push @sectionlist, $name;
 }
}

##
# dump DOC: section after checking that it should go out
#
sub dump_doc_section {
 my $file = shift;
 my $name = shift;
 my $contents = join "\n", @_;

 if ($no_doc_sections) {
 return;
 }

 if (($function_only == 0) ||
( $function_only == 1 && defined($function_table{$name})) ||
( $function_only == 2 && !defined($function_table{$name})))
 {
dump_section($file, $name, $contents);
output_blockhead({'sectionlist' => \@sectionlist,
 'sections' => \%sections,
 'module' => $modulename,
 'content-only' => ($function_only != 0), });
 }
}

##
# output function
#
# parameterdescs, a hash.
# function => "function name"
# parameterlist => @list of parameters
# parameterdescs => %parameter descriptions
# sectionlist => @list of sections
# sections => %section descriptions
#

sub output_highlight {
 my $contents = join "\n",@_;
 my $line;

# DEBUG
# if (!defined $contents) {
#	use Carp;
#	confess "output_highlight got called with no args?\n";
# }

 if ($output_mode eq "html" || $output_mode eq "xml") {
$contents = local_unescape($contents);
# convert data read & converted thru xml_escape() into &xyz; format:
$contents =~ s/\\\\\\/&/g;
 }
# print STDERR "contents b4:$contents\n";
 eval $dohighlight;
 die $@ if $@;
# print STDERR "contents af:$contents\n";

 foreach $line (split "\n", $contents) {
if ($line eq ""){
 print $lineprefix, local_unescape($blankline);
} else {
 $line =~ s/\\\\\\/\&/g;
 if ($output_mode eq "man" && substr($line, 0, 1) eq ".") {
print "\\&$line";
 } else {
print $lineprefix, $line;
 }
}
print "\n";
 }
}

#output sections in html
sub output_section_html(%) {
 my %args = %{$_[0]};
 my $section;

 foreach $section (@{$args{'sectionlist'}}) {
print "<h3>$section</h3>\n";
print "<blockquote>\n";
output_highlight($args{'sections'}{$section});
print "</blockquote>\n";
 }
}

# output enum in html
sub output_enum_html(%) {
 my %args = %{$_[0]};
 my ($parameter);
 my $count;
 print "<h2>enum ".$args{'enum'}."</h2>\n";

 print "<b>enum ".$args{'enum'}."</b> {<br>\n";
 $count = 0;
 foreach $parameter (@{$args{'parameterlist'}}) {
print " <b>".$parameter."</b>";
if ($count != $#{$args{'parameterlist'}}) {
 $count++;
 print ",\n";
}
print "<br>";
 }
 print "};<br>\n";

 print "<h3>Constants</h3>\n";
 print "<dl>\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
print "<dt><b>".$parameter."</b>\n";
print "<dd>";
output_highlight($args{'parameterdescs'}{$parameter});
 }
 print "</dl>\n";
 output_section_html(@_);
 print "<hr>\n";
}

# output typedef in html
sub output_typedef_html(%) {
 my %args = %{$_[0]};
 my ($parameter);
 my $count;
 print "<h2>typedef ".$args{'typedef'}."</h2>\n";

 print "<b>typedef ".$args{'typedef'}."</b>\n";
 output_section_html(@_);
 print "<hr>\n";
}

# output struct in html
sub output_struct_html(%) {
 my %args = %{$_[0]};
 my ($parameter);

 print "<h2>".$args{'type'}." ".$args{'struct'}. " - " .$args{'purpose'}."</h2>\n";
 print "<b>".$args{'type'}." ".$args{'struct'}."</b> {<br>\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
if ($parameter =~ /^#/) {
print "$parameter<br>\n";
next;
}
my $parameter_name = $parameter;
$parameter_name =~ s/\[.*//;

($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
$type = $args{'parametertypes'}{$parameter};
if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
 # pointer-to-function
 print "&nbsp; &nbsp; <i>$1</i><b>$parameter</b>) <i>($2)</i>;<br>\n";
} elsif ($type =~ m/^(.*?)\s*(:.*)/) {
 # bitfield
 print "&nbsp; &nbsp; <i>$1</i> <b>$parameter</b>$2;<br>\n";
} else {
 print "&nbsp; &nbsp; <i>$type</i> <b>$parameter</b>;<br>\n";
}
 }
 print "};<br>\n";

 print "<h3>Members</h3>\n";
 print "<dl>\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
($parameter =~ /^#/) && next;

my $parameter_name = $parameter;
$parameter_name =~ s/\[.*//;

($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
print "<dt><b>".$parameter."</b>\n";
print "<dd>";
output_highlight($args{'parameterdescs'}{$parameter_name});
 }
 print "</dl>\n";
 output_section_html(@_);
 print "<hr>\n";
}

# output function in html
sub output_function_html(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);
 my $count;

 print "<h2>" .$args{'function'}." - ".$args{'purpose'}."</h2>\n";
 print "<i>".$args{'functiontype'}."</i>\n";
 print "<b>".$args{'function'}."</b>\n";
 print "(";
 $count = 0;
 foreach $parameter (@{$args{'parameterlist'}}) {
$type = $args{'parametertypes'}{$parameter};
if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
 # pointer-to-function
 print "<i>$1</i><b>$parameter</b>) <i>($2)</i>";
} else {
 print "<i>".$type."</i> <b>".$parameter."</b>";
}
if ($count != $#{$args{'parameterlist'}}) {
 $count++;
 print ",\n";
}
 }
 print ")\n";

 print "<h3>Arguments</h3>\n";
 print "<dl>\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
my $parameter_name = $parameter;
$parameter_name =~ s/\[.*//;

($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
print "<dt><b>".$parameter."</b>\n";
print "<dd>";
output_highlight($args{'parameterdescs'}{$parameter_name});
 }
 print "</dl>\n";
 output_section_html(@_);
 print "<hr>\n";
}

# output DOC: block header in html
sub output_blockhead_html(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);
 my $count;

 foreach $section (@{$args{'sectionlist'}}) {
print "<h3>$section</h3>\n";
print "<ul>\n";
output_highlight($args{'sections'}{$section});
print "</ul>\n";
 }
 print "<hr>\n";
}

sub output_section_xml(%) {
 my %args = %{$_[0]};
 my $section;
 # print out each section
 $lineprefix=" ";
 foreach $section (@{$args{'sectionlist'}}) {
print "<refsect1>\n";
print "<title>$section</title>\n";
if ($section =~ m/EXAMPLE/i) {
 print "<informalexample><programlisting>\n";
} else {
 print "<para>\n";
}
output_highlight($args{'sections'}{$section});
if ($section =~ m/EXAMPLE/i) {
 print "</programlisting></informalexample>\n";
} else {
 print "</para>\n";
}
print "</refsect1>\n";
 }
}

# output function in XML DocBook
sub output_function_xml(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);
 my $count;
 my $id;

 $id = "API-".$args{'function'};
 $id =~ s/[^A-Za-z0-9]/-/g;

 print "<refentry id=\"$id\">\n";
 print "<refentryinfo>\n";
 print " <title>LINUX</title>\n";
 print " <productname>Kernel Hackers Manual</productname>\n";
 print " <date>$man_date</date>\n";
 print "</refentryinfo>\n";
 print "<refmeta>\n";
 print " <refentrytitle><phrase>".$args{'function'}."</phrase></refentrytitle>\n";
 print " <manvolnum>9</manvolnum>\n";
 print " <refmiscinfo class=\"version\">" . $kernelversion . "</refmiscinfo>\n";
 print "</refmeta>\n";
 print "<refnamediv>\n";
 print " <refname>".$args{'function'}."</refname>\n";
 print " <refpurpose>\n";
 print " ";
 output_highlight ($args{'purpose'});
 print " </refpurpose>\n";
 print "</refnamediv>\n";

 print "<refsynopsisdiv>\n";
 print " <title>Synopsis</title>\n";
 print " <funcsynopsis><funcprototype>\n";
 print " <funcdef>".$args{'functiontype'}." ";
 print "<function>".$args{'function'}." </function></funcdef>\n";

 $count = 0;
 if ($#{$args{'parameterlist'}} >= 0) {
foreach $parameter (@{$args{'parameterlist'}}) {
 $type = $args{'parametertypes'}{$parameter};
 if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
# pointer-to-function
print " <paramdef>$1<parameter>$parameter</parameter>)\n";
print " <funcparams>$2</funcparams></paramdef>\n";
 } else {
print " <paramdef>".$type;
print " <parameter>$parameter</parameter></paramdef>\n";
 }
}
 } else {
print " <void/>\n";
 }
 print " </funcprototype></funcsynopsis>\n";
 print "</refsynopsisdiv>\n";

 # print parameters
 print "<refsect1>\n <title>Arguments</title>\n";
 if ($#{$args{'parameterlist'}} >= 0) {
print " <variablelist>\n";
foreach $parameter (@{$args{'parameterlist'}}) {
 my $parameter_name = $parameter;
 $parameter_name =~ s/\[.*//;

 print " <varlistentry>\n <term><parameter>$parameter</parameter></term>\n";
 print " <listitem>\n <para>\n";
 $lineprefix=" ";
 output_highlight($args{'parameterdescs'}{$parameter_name});
 print " </para>\n </listitem>\n </varlistentry>\n";
}
print " </variablelist>\n";
 } else {
print " <para>\n None\n </para>\n";
 }
 print "</refsect1>\n";

 output_section_xml(@_);
 print "</refentry>\n\n";
}

# output struct in XML DocBook
sub output_struct_xml(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);
 my $id;

 $id = "API-struct-".$args{'struct'};
 $id =~ s/[^A-Za-z0-9]/-/g;

 print "<refentry id=\"$id\">\n";
 print "<refentryinfo>\n";
 print " <title>LINUX</title>\n";
 print " <productname>Kernel Hackers Manual</productname>\n";
 print " <date>$man_date</date>\n";
 print "</refentryinfo>\n";
 print "<refmeta>\n";
 print " <refentrytitle><phrase>".$args{'type'}." ".$args{'struct'}."</phrase></refentrytitle>\n";
 print " <manvolnum>9</manvolnum>\n";
 print " <refmiscinfo class=\"version\">" . $kernelversion . "</refmiscinfo>\n";
 print "</refmeta>\n";
 print "<refnamediv>\n";
 print " <refname>".$args{'type'}." ".$args{'struct'}."</refname>\n";
 print " <refpurpose>\n";
 print " ";
 output_highlight ($args{'purpose'});
 print " </refpurpose>\n";
 print "</refnamediv>\n";

 print "<refsynopsisdiv>\n";
 print " <title>Synopsis</title>\n";
 print " <programlisting>\n";
 print $args{'type'}." ".$args{'struct'}." {\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
if ($parameter =~ /^#/) {
 print "$parameter\n";
 next;
}

my $parameter_name = $parameter;
$parameter_name =~ s/\[.*//;

defined($args{'parameterdescs'}{$parameter_name}) || next;
($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
$type = $args{'parametertypes'}{$parameter};
if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
 # pointer-to-function
 print " $1 $parameter) ($2);\n";
} elsif ($type =~ m/^(.*?)\s*(:.*)/) {
 # bitfield
 print " $1 $parameter$2;\n";
} else {
 print " ".$type." ".$parameter.";\n";
}
 }
 print "};";
 print " </programlisting>\n";
 print "</refsynopsisdiv>\n";

 print " <refsect1>\n";
 print " <title>Members</title>\n";

 if ($#{$args{'parameterlist'}} >= 0) {
 print " <variablelist>\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
 ($parameter =~ /^#/) && next;

 my $parameter_name = $parameter;
 $parameter_name =~ s/\[.*//;

 defined($args{'parameterdescs'}{$parameter_name}) || next;
 ($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
 print " <varlistentry>";
 print " <term>$parameter</term>\n";
 print " <listitem><para>\n";
 output_highlight($args{'parameterdescs'}{$parameter_name});
 print " </para></listitem>\n";
 print " </varlistentry>\n";
 }
 print " </variablelist>\n";
 } else {
print " <para>\n None\n </para>\n";
 }
 print " </refsect1>\n";

 output_section_xml(@_);

 print "</refentry>\n\n";
}

# output enum in XML DocBook
sub output_enum_xml(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);
 my $count;
 my $id;

 $id = "API-enum-".$args{'enum'};
 $id =~ s/[^A-Za-z0-9]/-/g;

 print "<refentry id=\"$id\">\n";
 print "<refentryinfo>\n";
 print " <title>LINUX</title>\n";
 print " <productname>Kernel Hackers Manual</productname>\n";
 print " <date>$man_date</date>\n";
 print "</refentryinfo>\n";
 print "<refmeta>\n";
 print " <refentrytitle><phrase>enum ".$args{'enum'}."</phrase></refentrytitle>\n";
 print " <manvolnum>9</manvolnum>\n";
 print " <refmiscinfo class=\"version\">" . $kernelversion . "</refmiscinfo>\n";
 print "</refmeta>\n";
 print "<refnamediv>\n";
 print " <refname>enum ".$args{'enum'}."</refname>\n";
 print " <refpurpose>\n";
 print " ";
 output_highlight ($args{'purpose'});
 print " </refpurpose>\n";
 print "</refnamediv>\n";

 print "<refsynopsisdiv>\n";
 print " <title>Synopsis</title>\n";
 print " <programlisting>\n";
 print "enum ".$args{'enum'}." {\n";
 $count = 0;
 foreach $parameter (@{$args{'parameterlist'}}) {
print " $parameter";
if ($count != $#{$args{'parameterlist'}}) {
 $count++;
 print ",";
}
print "\n";
 }
 print "};";
 print " </programlisting>\n";
 print "</refsynopsisdiv>\n";

 print "<refsect1>\n";
 print " <title>Constants</title>\n";
 print " <variablelist>\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
 my $parameter_name = $parameter;
 $parameter_name =~ s/\[.*//;

 print " <varlistentry>";
 print " <term>$parameter</term>\n";
 print " <listitem><para>\n";
 output_highlight($args{'parameterdescs'}{$parameter_name});
 print " </para></listitem>\n";
 print " </varlistentry>\n";
 }
 print " </variablelist>\n";
 print "</refsect1>\n";

 output_section_xml(@_);

 print "</refentry>\n\n";
}

# output typedef in XML DocBook
sub output_typedef_xml(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);
 my $id;

 $id = "API-typedef-".$args{'typedef'};
 $id =~ s/[^A-Za-z0-9]/-/g;

 print "<refentry id=\"$id\">\n";
 print "<refentryinfo>\n";
 print " <title>LINUX</title>\n";
 print " <productname>Kernel Hackers Manual</productname>\n";
 print " <date>$man_date</date>\n";
 print "</refentryinfo>\n";
 print "<refmeta>\n";
 print " <refentrytitle><phrase>typedef ".$args{'typedef'}."</phrase></refentrytitle>\n";
 print " <manvolnum>9</manvolnum>\n";
 print "</refmeta>\n";
 print "<refnamediv>\n";
 print " <refname>typedef ".$args{'typedef'}."</refname>\n";
 print " <refpurpose>\n";
 print " ";
 output_highlight ($args{'purpose'});
 print " </refpurpose>\n";
 print "</refnamediv>\n";

 print "<refsynopsisdiv>\n";
 print " <title>Synopsis</title>\n";
 print " <synopsis>typedef ".$args{'typedef'}.";</synopsis>\n";
 print "</refsynopsisdiv>\n";

 output_section_xml(@_);

 print "</refentry>\n\n";
}

# output in XML DocBook
sub output_blockhead_xml(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);
 my $count;

 my $id = $args{'module'};
 $id =~ s/[^A-Za-z0-9]/-/g;

 # print out each section
 $lineprefix=" ";
 foreach $section (@{$args{'sectionlist'}}) {
if (!$args{'content-only'}) {
print "<refsect1>\n <title>$section</title>\n";
}
if ($section =~ m/EXAMPLE/i) {
 print "<example><para>\n";
} else {
 print "<para>\n";
}
output_highlight($args{'sections'}{$section});
if ($section =~ m/EXAMPLE/i) {
 print "</para></example>\n";
} else {
 print "</para>";
}
if (!$args{'content-only'}) {
print "\n</refsect1>\n";
}
 }

 print "\n\n";
}

# output in XML DocBook
sub output_function_gnome {
 my %args = %{$_[0]};
 my ($parameter, $section);
 my $count;
 my $id;

 $id = $args{'module'}."-".$args{'function'};
 $id =~ s/[^A-Za-z0-9]/-/g;

 print "<sect2>\n";
 print " <title id=\"$id\">".$args{'function'}."</title>\n";

 print " <funcsynopsis>\n";
 print " <funcdef>".$args{'functiontype'}." ";
 print "<function>".$args{'function'}." ";
 print "</function></funcdef>\n";

 $count = 0;
 if ($#{$args{'parameterlist'}} >= 0) {
foreach $parameter (@{$args{'parameterlist'}}) {
 $type = $args{'parametertypes'}{$parameter};
 if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
# pointer-to-function
print " <paramdef>$1 <parameter>$parameter</parameter>)\n";
print " <funcparams>$2</funcparams></paramdef>\n";
 } else {
print " <paramdef>".$type;
print " <parameter>$parameter</parameter></paramdef>\n";
 }
}
 } else {
print " <void>\n";
 }
 print " </funcsynopsis>\n";
 if ($#{$args{'parameterlist'}} >= 0) {
print " <informaltable pgwide=\"1\" frame=\"none\" role=\"params\">\n";
print "<tgroup cols=\"2\">\n";
print "<colspec colwidth=\"2*\">\n";
print "<colspec colwidth=\"8*\">\n";
print "<tbody>\n";
foreach $parameter (@{$args{'parameterlist'}}) {
 my $parameter_name = $parameter;
 $parameter_name =~ s/\[.*//;

 print " <row><entry align=\"right\"><parameter>$parameter</parameter></entry>\n";
 print " <entry>\n";
 $lineprefix=" ";
 output_highlight($args{'parameterdescs'}{$parameter_name});
 print " </entry></row>\n";
}
print " </tbody></tgroup></informaltable>\n";
 } else {
print " <para>\n None\n </para>\n";
 }

 # print out each section
 $lineprefix=" ";
 foreach $section (@{$args{'sectionlist'}}) {
print "<simplesect>\n <title>$section</title>\n";
if ($section =~ m/EXAMPLE/i) {
 print "<example><programlisting>\n";
} else {
}
print "<para>\n";
output_highlight($args{'sections'}{$section});
print "</para>\n";
if ($section =~ m/EXAMPLE/i) {
 print "</programlisting></example>\n";
} else {
}
print " </simplesect>\n";
 }

 print "</sect2>\n\n";
}

##
# output function in man
sub output_function_man(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);
 my $count;

 print ".TH \"$args{'function'}\" 9 \"$args{'function'}\" \"$man_date\" \"Kernel Hacker's Manual\" LINUX\n";

 print ".SH NAME\n";
 print $args{'function'}." \\- ".$args{'purpose'}."\n";

 print ".SH SYNOPSIS\n";
 if ($args{'functiontype'} ne "") {
print ".B \"".$args{'functiontype'}."\" ".$args{'function'}."\n";
 } else {
print ".B \"".$args{'function'}."\n";
 }
 $count = 0;
 my $parenth = "(";
 my $post = ",";
 foreach my $parameter (@{$args{'parameterlist'}}) {
if ($count == $#{$args{'parameterlist'}}) {
 $post = ");";
}
$type = $args{'parametertypes'}{$parameter};
if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
 # pointer-to-function
 print ".BI \"".$parenth.$1."\" ".$parameter." \") (".$2.")".$post."\"\n";
} else {
 $type =~ s/([^\*])$/$1 /;
 print ".BI \"".$parenth.$type."\" ".$parameter." \"".$post."\"\n";
}
$count++;
$parenth = "";
 }

 print ".SH ARGUMENTS\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
my $parameter_name = $parameter;
$parameter_name =~ s/\[.*//;

print ".IP \"".$parameter."\" 12\n";
output_highlight($args{'parameterdescs'}{$parameter_name});
 }
 foreach $section (@{$args{'sectionlist'}}) {
print ".SH \"", uc $section, "\"\n";
output_highlight($args{'sections'}{$section});
 }
}

##
# output enum in man
sub output_enum_man(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);
 my $count;

 print ".TH \"$args{'module'}\" 9 \"enum $args{'enum'}\" \"$man_date\" \"API Manual\" LINUX\n";

 print ".SH NAME\n";
 print "enum ".$args{'enum'}." \\- ".$args{'purpose'}."\n";

 print ".SH SYNOPSIS\n";
 print "enum ".$args{'enum'}." {\n";
 $count = 0;
 foreach my $parameter (@{$args{'parameterlist'}}) {
print ".br\n.BI \" $parameter\"\n";
if ($count == $#{$args{'parameterlist'}}) {
 print "\n};\n";
 last;
}
else {
 print ", \n.br\n";
}
$count++;
 }

 print ".SH Constants\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
my $parameter_name = $parameter;
$parameter_name =~ s/\[.*//;

print ".IP \"".$parameter."\" 12\n";
output_highlight($args{'parameterdescs'}{$parameter_name});
 }
 foreach $section (@{$args{'sectionlist'}}) {
print ".SH \"$section\"\n";
output_highlight($args{'sections'}{$section});
 }
}

##
# output struct in man
sub output_struct_man(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);

 print ".TH \"$args{'module'}\" 9 \"".$args{'type'}." ".$args{'struct'}."\" \"$man_date\" \"API Manual\" LINUX\n";

 print ".SH NAME\n";
 print $args{'type'}." ".$args{'struct'}." \\- ".$args{'purpose'}."\n";

 print ".SH SYNOPSIS\n";
 print $args{'type'}." ".$args{'struct'}." {\n.br\n";

 foreach my $parameter (@{$args{'parameterlist'}}) {
if ($parameter =~ /^#/) {
 print ".BI \"$parameter\"\n.br\n";
 next;
}
my $parameter_name = $parameter;
$parameter_name =~ s/\[.*//;

($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
$type = $args{'parametertypes'}{$parameter};
if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
 # pointer-to-function
 print ".BI \" ".$1."\" ".$parameter." \") (".$2.")"."\"\n;\n";
} elsif ($type =~ m/^(.*?)\s*(:.*)/) {
 # bitfield
 print ".BI \" ".$1."\ \" ".$parameter.$2." \""."\"\n;\n";
} else {
 $type =~ s/([^\*])$/$1 /;
 print ".BI \" ".$type."\" ".$parameter." \""."\"\n;\n";
}
print "\n.br\n";
 }
 print "};\n.br\n";

 print ".SH Members\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
($parameter =~ /^#/) && next;

my $parameter_name = $parameter;
$parameter_name =~ s/\[.*//;

($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
print ".IP \"".$parameter."\" 12\n";
output_highlight($args{'parameterdescs'}{$parameter_name});
 }
 foreach $section (@{$args{'sectionlist'}}) {
print ".SH \"$section\"\n";
output_highlight($args{'sections'}{$section});
 }
}

##
# output typedef in man
sub output_typedef_man(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);

 print ".TH \"$args{'module'}\" 9 \"$args{'typedef'}\" \"$man_date\" \"API Manual\" LINUX\n";

 print ".SH NAME\n";
 print "typedef ".$args{'typedef'}." \\- ".$args{'purpose'}."\n";

 foreach $section (@{$args{'sectionlist'}}) {
print ".SH \"$section\"\n";
output_highlight($args{'sections'}{$section});
 }
}

sub output_blockhead_man(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);
 my $count;

 print ".TH \"$args{'module'}\" 9 \"$args{'module'}\" \"$man_date\" \"API Manual\" LINUX\n";

 foreach $section (@{$args{'sectionlist'}}) {
print ".SH \"$section\"\n";
output_highlight($args{'sections'}{$section});
 }
}

##
# output in text
sub output_function_text(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);
 my $start;

 print "Name:\n\n";
 print $args{'function'}." - ".$args{'purpose'}."\n";

 print "\nSynopsis:\n\n";
 if ($args{'functiontype'} ne "") {
$start = $args{'functiontype'}." ".$args{'function'}." (";
 } else {
$start = $args{'function'}." (";
 }
 print $start;

 my $count = 0;
 foreach my $parameter (@{$args{'parameterlist'}}) {
$type = $args{'parametertypes'}{$parameter};
if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
 # pointer-to-function
 print $1.$parameter.") (".$2;
} else {
 print $type." ".$parameter;
}
if ($count != $#{$args{'parameterlist'}}) {
 $count++;
 print ",\n";
 print " " x length($start);
} else {
 print ");\n\n";
}
 }

 print "Arguments:\n\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
my $parameter_name = $parameter;
$parameter_name =~ s/\[.*//;

print $parameter."\n\t".$args{'parameterdescs'}{$parameter_name}."\n";
 }
 output_section_text(@_);
}

#output sections in text
sub output_section_text(%) {
 my %args = %{$_[0]};
 my $section;

 print "\n";
 foreach $section (@{$args{'sectionlist'}}) {
print "$section:\n\n";
output_highlight($args{'sections'}{$section});
 }
 print "\n\n";
}

# output enum in text
sub output_enum_text(%) {
 my %args = %{$_[0]};
 my ($parameter);
 my $count;
 print "Enum:\n\n";

 print "enum ".$args{'enum'}." - ".$args{'purpose'}."\n\n";
 print "enum ".$args{'enum'}." {\n";
 $count = 0;
 foreach $parameter (@{$args{'parameterlist'}}) {
print "\t$parameter";
if ($count != $#{$args{'parameterlist'}}) {
 $count++;
 print ",";
}
print "\n";
 }
 print "};\n\n";

 print "Constants:\n\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
print "$parameter\n\t";
print $args{'parameterdescs'}{$parameter}."\n";
 }

 output_section_text(@_);
}

# output typedef in text
sub output_typedef_text(%) {
 my %args = %{$_[0]};
 my ($parameter);
 my $count;
 print "Typedef:\n\n";

 print "typedef ".$args{'typedef'}." - ".$args{'purpose'}."\n";
 output_section_text(@_);
}

# output struct as text
sub output_struct_text(%) {
 my %args = %{$_[0]};
 my ($parameter);

 print $args{'type'}." ".$args{'struct'}." - ".$args{'purpose'}."\n\n";
 print $args{'type'}." ".$args{'struct'}." {\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
if ($parameter =~ /^#/) {
 print "$parameter\n";
 next;
}

my $parameter_name = $parameter;
$parameter_name =~ s/\[.*//;

($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
$type = $args{'parametertypes'}{$parameter};
if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
 # pointer-to-function
 print "\t$1 $parameter) ($2);\n";
} elsif ($type =~ m/^(.*?)\s*(:.*)/) {
 # bitfield
 print "\t$1 $parameter$2;\n";
} else {
 print "\t".$type." ".$parameter.";\n";
}
 }
 print "};\n\n";

 print "Members:\n\n";
 foreach $parameter (@{$args{'parameterlist'}}) {
($parameter =~ /^#/) && next;

my $parameter_name = $parameter;
$parameter_name =~ s/\[.*//;

($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
print "$parameter\n\t";
print $args{'parameterdescs'}{$parameter_name}."\n";
 }
 print "\n";
 output_section_text(@_);
}

sub output_blockhead_text(%) {
 my %args = %{$_[0]};
 my ($parameter, $section);

 foreach $section (@{$args{'sectionlist'}}) {
print " $section:\n";
print " -> ";
output_highlight($args{'sections'}{$section});
 }
}

##
# generic output function for all types (function, struct/union, typedef, enum);
# calls the generated, variable output_ function name based on
# functype and output_mode
sub output_declaration {
 no strict 'refs';
 my $name = shift;
 my $functype = shift;
 my $func = "output_${functype}_$output_mode";
 if (($function_only==0) ||
( $function_only == 1 && defined($function_table{$name})) ||
( $function_only == 2 && !defined($function_table{$name})))
 {
&$func(@_);
$section_counter++;
 }
}

##
# generic output function - calls the right one based on current output mode.
sub output_blockhead {
 no strict 'refs';
 my $func = "output_blockhead_".$output_mode;
 &$func(@_);
 $section_counter++;
}

##
# takes a declaration (struct, union, enum, typedef) and
# invokes the right handler. NOT called for functions.
sub dump_declaration($$) {
 no strict 'refs';
 my ($prototype, $file) = @_;
 my $func = "dump_".$decl_type;
 &$func(@_);
}

sub dump_union($$) {
 dump_struct(@_);
}

sub dump_struct($$) {
 my $x = shift;
 my $file = shift;
 my $nested;

 if ($x =~/(struct|union)\s+(\w+)\s*{(.*)}/) {
$declaration_name = $2;
my $members = $3;

# ignore embedded structs or unions
$members =~ s/({.*})//g;
$nested = $1;

# ignore members marked private:
$members =~ s/\/\*.*?private:.*?public:.*?\*\///gos;
$members =~ s/\/\*.*?private:.*//gos;
# strip comments:
$members =~ s/\/\*.*?\*\///gos;
$nested =~ s/\/\*.*?\*\///gos;

create_parameterlist($members, ';', $file);
check_sections($file, $declaration_name, "struct", $sectcheck, $struct_actual, $nested);

output_declaration($declaration_name,
 'struct',
 {'struct' => $declaration_name,
 'module' => $modulename,
 'parameterlist' => \@parameterlist,
 'parameterdescs' => \%parameterdescs,
 'parametertypes' => \%parametertypes,
 'sectionlist' => \@sectionlist,
 'sections' => \%sections,
 'purpose' => $declaration_purpose,
 'type' => $decl_type
 });
 }
 else {
print STDERR "Error(${file}:$.): Cannot parse struct or union!\n";
++$errors;
 }
}

sub dump_enum($$) {
 my $x = shift;
 my $file = shift;

 $x =~ s@/\*.*?\*/@@gos;# strip comments.
 if ($x =~ /enum\s+(\w+)\s*{(.*)}/) {
$declaration_name = $1;
my $members = $2;

foreach my $arg (split ',', $members) {
 $arg =~ s/^\s*(\w+).*/$1/;
 push @parameterlist, $arg;
 if (!$parameterdescs{$arg}) {
$parameterdescs{$arg} = $undescribed;
print STDERR "Warning(${file}:$.): Enum value '$arg' ".
 "not described in enum '$declaration_name'\n";
 }

}

output_declaration($declaration_name,
 'enum',
 {'enum' => $declaration_name,
 'module' => $modulename,
 'parameterlist' => \@parameterlist,
 'parameterdescs' => \%parameterdescs,
 'sectionlist' => \@sectionlist,
 'sections' => \%sections,
 'purpose' => $declaration_purpose
 });
 }
 else {
print STDERR "Error(${file}:$.): Cannot parse enum!\n";
++$errors;
 }
}

sub dump_typedef($$) {
 my $x = shift;
 my $file = shift;

 $x =~ s@/\*.*?\*/@@gos;# strip comments.
 while (($x =~ /\(*.\)\s*;$/) || ($x =~ /\[*.\]\s*;$/)) {
$x =~ s/\(*.\)\s*;$/;/;
$x =~ s/\[*.\]\s*;$/;/;
 }

 if ($x =~ /typedef.*\s+(\w+)\s*;/) {
$declaration_name = $1;

output_declaration($declaration_name,
 'typedef',
 {'typedef' => $declaration_name,
 'module' => $modulename,
 'sectionlist' => \@sectionlist,
 'sections' => \%sections,
 'purpose' => $declaration_purpose
 });
 }
 else {
print STDERR "Error(${file}:$.): Cannot parse typedef!\n";
++$errors;
 }
}

sub save_struct_actual($) {
 my $actual = shift;

 # strip all spaces from the actual param so that it looks like one string item
 $actual =~ s/\s*//g;
 $struct_actual = $struct_actual . $actual . " ";
}

sub create_parameterlist($$$) {
 my $args = shift;
 my $splitter = shift;
 my $file = shift;
 my $type;
 my $param;

 # temporarily replace commas inside function pointer definition
 while ($args =~ /(\([^\),]+),/) {
$args =~ s/(\([^\),]+),/$1#/g;
 }

 foreach my $arg (split($splitter, $args)) {
# strip comments
$arg =~ s/\/\*.*\*\///;
# strip leading/trailing spaces
$arg =~ s/^\s*//;
$arg =~ s/\s*$//;
$arg =~ s/\s+/ /;

if ($arg =~ /^#/) {
 # Treat preprocessor directive as a typeless variable just to fill
 # corresponding data structures "correctly". Catch it later in
 # output_* subs.
 push_parameter($arg, "", $file);
} elsif ($arg =~ m/\(.+\)\s*\(/) {
 # pointer-to-function
 $arg =~ tr/#/,/;
 $arg =~ m/[^\(]+\(\*?\s*(\w*)\s*\)/;
 $param = $1;
 $type = $arg;
 $type =~ s/([^\(]+\(\*?)\s*$param/$1/;
 save_struct_actual($param);
 push_parameter($param, $type, $file);
} elsif ($arg) {
 $arg =~ s/\s*:\s*/:/g;
 $arg =~ s/\s*\[/\[/g;

 my @args = split('\s*,\s*', $arg);
 if ($args[0] =~ m/\*/) {
$args[0] =~ s/(\*+)\s*/ $1/;
 }

 my @first_arg;
 if ($args[0] =~ /^(.*\s+)(.*?\[.*\].*)$/) {
 shift @args;
 push(@first_arg, split('\s+', $1));
 push(@first_arg, $2);
 } else {
 @first_arg = split('\s+', shift @args);
 }

 unshift(@args, pop @first_arg);
 $type = join " ", @first_arg;

 foreach $param (@args) {
if ($param =~ m/^(\*+)\s*(.*)/) {
 save_struct_actual($2);
 push_parameter($2, "$type $1", $file);
}
elsif ($param =~ m/(.*?):(\d+)/) {
 if ($type ne "") { # skip unnamed bit-fields
save_struct_actual($1);
push_parameter($1, "$type:$2", $file)
 }
}
else {
 save_struct_actual($param);
 push_parameter($param, $type, $file);
}
 }
}
 }
}

sub push_parameter($$$) {
my $param = shift;
my $type = shift;
my $file = shift;

if (($anon_struct_union == 1) && ($type eq "") &&
 ($param eq "}")) {
return;# ignore the ending }; from anon. struct/union
}

$anon_struct_union = 0;
my $param_name = $param;
$param_name =~ s/\[.*//;

if ($type eq "" && $param =~ /\.\.\.$/)
{
 if (!defined $parameterdescs{$param} || $parameterdescs{$param} eq "") {
$parameterdescs{$param} = "variable arguments";
 }
}
elsif ($type eq "" && ($param eq "" or $param eq "void"))
{
 $param="void";
 $parameterdescs{void} = "no arguments";
}
elsif ($type eq "" && ($param eq "struct" or $param eq "union"))
# handle unnamed (anonymous) union or struct:
{
$type = $param;
$param = "{unnamed_" . $param . "}";
$parameterdescs{$param} = "anonymous\n";
$anon_struct_union = 1;
}

# warn if parameter has no description
# (but ignore ones starting with # as these are not parameters
# but inline preprocessor statements);
# also ignore unnamed structs/unions;
if (!$anon_struct_union) {
if (!defined $parameterdescs{$param_name} && $param_name !~ /^#/) {

 $parameterdescs{$param_name} = $undescribed;

 if (($type eq 'function') || ($type eq 'enum')) {
print STDERR "Warning(${file}:$.): Function parameter ".
 "or member '$param' not " .
 "described in '$declaration_name'\n";
 }
 print STDERR "Warning(${file}:$.):".
 " No description found for parameter '$param'\n";
 ++$warnings;
}
}

push @parameterlist, $param;
$parametertypes{$param} = $type;
}

sub check_sections($$$$$$) {
my ($file, $decl_name, $decl_type, $sectcheck, $prmscheck, $nested) = @_;
my @sects = split ' ', $sectcheck;
my @prms = split ' ', $prmscheck;
my $err;
my ($px, $sx);
my $prm_clean;# strip trailing "[array size]" and/or beginning "*"

foreach $sx (0 .. $#sects) {
$err = 1;
foreach $px (0 .. $#prms) {
$prm_clean = $prms[$px];
$prm_clean =~ s/\[.*\]//;
$prm_clean =~ s/__attribute__\s*\(\([a-z,_\*\s\(\)]*\)\)//;
##$prm_clean =~ s/^\**//;
if ($prm_clean eq $sects[$sx]) {
$err = 0;
last;
}
}
if ($err) {
if ($decl_type eq "function") {
print STDERR "Warning(${file}:$.): " .
"Excess function parameter " .
"'$sects[$sx]' " .
"description in '$decl_name'\n";
++$warnings;
} else {
if ($nested !~ m/\Q$sects[$sx]\E/) {
 print STDERR "Warning(${file}:$.): " .
"Excess struct/union/enum/typedef member " .
"'$sects[$sx]' " .
"description in '$decl_name'\n";
 ++$warnings;
}
}
}
}
}

##
# takes a function prototype and the name of the current file being
# processed and spits out all the details stored in the global
# arrays/hashes.
sub dump_function($$) {
 my $prototype = shift;
 my $file = shift;

 $prototype =~ s/^static +//;
 $prototype =~ s/^extern +//;
 $prototype =~ s/^asmlinkage +//;
 $prototype =~ s/^inline +//;
 $prototype =~ s/^__inline__ +//;
 $prototype =~ s/^__inline +//;
 $prototype =~ s/^__always_inline +//;
 $prototype =~ s/^noinline +//;
 $prototype =~ s/__devinit +//;
 $prototype =~ s/__init +//;
 $prototype =~ s/^#\s*define\s+//; #ak added
 $prototype =~ s/__attribute__\s*\(\([a-z,]*\)\)//;

 # Yes, this truly is vile. We are looking for:
 # 1. Return type (may be nothing if we're looking at a macro)
 # 2. Function name
 # 3. Function parameters.
 #
 # All the while we have to watch out for function pointer parameters
 # (which IIRC is what the two sections are for), C types (these
 # regexps don't even start to express all the possibilities), and
 # so on.
 #
 # If you mess with these regexps, it's a good idea to check that
 # the following functions' documentation still comes out right:
 # - parport_register_device (function pointer parameters)
 # - atomic_set (macro)
 # - pci_match_device, __copy_to_user (long return type)

 if ($prototype =~ m/^()([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
$prototype =~ m/^(\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
$prototype =~ m/^(\w+\s*\*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
$prototype =~ m/^(\w+\s+\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
$prototype =~ m/^(\w+\s+\w+\s*\*+)\s*([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
$prototype =~ m/^(\w+\s+\w+\s+\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
$prototype =~ m/^(\w+\s+\w+\s+\w+\s*\*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
$prototype =~ m/^()([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
$prototype =~ m/^(\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
$prototype =~ m/^(\w+\s*\*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
$prototype =~ m/^(\w+\s+\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
$prototype =~ m/^(\w+\s+\w+\s*\*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
$prototype =~ m/^(\w+\s+\w+\s+\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
$prototype =~ m/^(\w+\s+\w+\s+\w+\s*\*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
$prototype =~ m/^(\w+\s+\w+\s+\w+\s+\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
$prototype =~ m/^(\w+\s+\w+\s+\w+\s+\w+\s*\*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
$prototype =~ m/^(\w+\s+\w+\s*\*\s*\w+\s*\*\s*)\s*([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/) {
$return_type = $1;
$declaration_name = $2;
my $args = $3;

create_parameterlist($args, ',', $file);
 } else {
print STDERR "Error(${file}:$.): cannot understand prototype: '$prototype'\n";
++$errors;
return;
 }

my $prms = join " ", @parameterlist;
check_sections($file, $declaration_name, "function", $sectcheck, $prms, "");

 output_declaration($declaration_name,
 'function',
 {'function' => $declaration_name,
'module' => $modulename,
'functiontype' => $return_type,
'parameterlist' => \@parameterlist,
'parameterdescs' => \%parameterdescs,
'parametertypes' => \%parametertypes,
'sectionlist' => \@sectionlist,
'sections' => \%sections,
'purpose' => $declaration_purpose
 });
}

sub process_file($);

# Read the file that maps relative names to absolute names for
# separate source and object directories and for shadow trees.
if (open(SOURCE_MAP, "<.tmp_filelist.txt")) {
my ($relname, $absname);
while(<SOURCE_MAP>) {
chop();
($relname, $absname) = (split())[0..1];
$relname =~ s:^/+::;
$source_map{$relname} = $absname;
}
close(SOURCE_MAP);
}

if ($filelist) {
open(FLIST,"<$filelist") or die "Can't open file list $filelist";
while(<FLIST>) {
chop;
process_file($_);
}
}

foreach (@ARGV) {
 chomp;
 process_file($_);
}
if ($verbose && $errors) {
 print STDERR "$errors errors\n";
}
if ($verbose && $warnings) {
 print STDERR "$warnings warnings\n";
}

exit($errors);

sub reset_state {
 $function = "";
 %constants = ();
 %parameterdescs = ();
 %parametertypes = ();
 @parameterlist = ();
 %sections = ();
 @sectionlist = ();
 $sectcheck = "";
 $struct_actual = "";
 $prototype = "";

 $state = 0;
}

sub process_state3_function($$) {
 my $x = shift;
 my $file = shift;

 $x =~ s@\/\/.*$@@gos; # strip C99-style comments to end of line

 if ($x =~ m#\s*/\*\s+MACDOC\s*#io || ($x =~ /^#/ && $x !~ /^#\s*define/)) {
# do nothing
 }
 elsif ($x =~ /([^\{]*)/) {
$prototype .= $1;
 }
 if (($x =~ /\{/) || ($x =~ /\#\s*define/) || ($x =~ /;/)) {
$prototype =~ s@/\*.*?\*/@@gos;# strip comments.
$prototype =~ s@[\r\n]+@ @gos; # strip newlines/cr's.
$prototype =~ s@^\s+@@gos; # strip leading spaces
dump_function($prototype,$file);
reset_state();
 }
}

sub process_state3_type($$) {
 my $x = shift;
 my $file = shift;

 $x =~ s@[\r\n]+@ @gos; # strip newlines/cr's.
 $x =~ s@^\s+@@gos; # strip leading spaces
 $x =~ s@\s+$@@gos; # strip trailing spaces
 $x =~ s@\/\/.*$@@gos; # strip C99-style comments to end of line

 if ($x =~ /^#/) {
# To distinguish preprocessor directive from regular declaration later.
$x .= ";";
 }

 while (1) {
if ( $x =~ /([^{};]*)([{};])(.*)/ ) {
 $prototype .= $1 . $2;
 ($2 eq '{') && $brcount++;
 ($2 eq '}') && $brcount--;
 if (($2 eq ';') && ($brcount == 0)) {
dump_declaration($prototype,$file);
reset_state();
last;
 }
 $x = $3;
} else {
 $prototype .= $x;
 last;
}
 }
}

# xml_escape: replace <, >, and & in the text stream;
#
# however, formatting controls that are generated internally/locally in the
# kernel-doc script are not escaped here; instead, they begin life like
# $blankline_html (4 of '\' followed by a mnemonic + ':'), then these strings
# are converted to their mnemonic-expected output, without the 4 * '\' & ':',
# just before actual output; (this is done by local_unescape())
sub xml_escape($) {
my $text = shift;
if (($output_mode eq "text") || ($output_mode eq "man")) {
return $text;
}
$text =~ s/\&/\\\\\\amp;/g;
$text =~ s/\</\\\\\\lt;/g;
$text =~ s/\>/\\\\\\gt;/g;
return $text;
}

# convert local escape strings to html
# local escape strings look like: '\\\\menmonic:' (that's 4 backslashes)
sub local_unescape($) {
my $text = shift;
if (($output_mode eq "text") || ($output_mode eq "man")) {
return $text;
}
$text =~ s/\\\\\\\\lt:/</g;
$text =~ s/\\\\\\\\gt:/>/g;
return $text;
}

sub process_file($) {
 my $file;
 my $identifier;
 my $func;
 my $descr;
 my $initial_section_counter = $section_counter;

 if (defined($ENV{'SRCTREE'})) {
$file = "$ENV{'SRCTREE'}" . "/" . "@_";
 }
 else {
$file = "@_";
 }
 if (defined($source_map{$file})) {
$file = $source_map{$file};
 }

 if (!open(IN,"<$file")) {
print STDERR "Error: Cannot open file $file\n";
++$errors;
return;
 }

 $section_counter = 0;
 while (<IN>) {
if ($state == 0) {
 if (/$doc_start/o) {
$state = 1;# next line is always the function name
$in_doc_sect = 0;
 }
} elsif ($state == 1) {# this line is the function name (always)
 if (/$doc_block/o) {
$state = 4;
$contents = "";
if ( $1 eq "" ) {
$section = $section_intro;
} else {
$section = $1;
}
 }
 elsif (/$doc_decl/o) {
$identifier = $1;
if (/\s*([\w\s]+?)\s*-/) {
 $identifier = $1;
}

$state = 2;
if (/-(.*)/) {
 # strip leading/trailing/multiple spaces
 $descr= $1;
 $descr =~ s/^\s*//;
 $descr =~ s/\s*$//;
 $descr =~ s/\s+/ /;
 $declaration_purpose = xml_escape($descr);
} else {
 $declaration_purpose = "";
}

if (($declaration_purpose eq "") && $verbose) {
print STDERR "Warning(${file}:$.): missing initial short description on line:\n";
print STDERR $_;
++$warnings;
}

if ($identifier =~ m/^struct/) {
 $decl_type = 'struct';
} elsif ($identifier =~ m/^union/) {
 $decl_type = 'union';
} elsif ($identifier =~ m/^enum/) {
 $decl_type = 'enum';
} elsif ($identifier =~ m/^typedef/) {
 $decl_type = 'typedef';
} else {
 $decl_type = 'function';
}

if ($verbose) {
 print STDERR "Info(${file}:$.): Scanning doc for $identifier\n";
}
 } else {
print STDERR "Warning(${file}:$.): Cannot understand $_ on line $.",
" - I thought it was a doc line\n";
++$warnings;
$state = 0;
 }
} elsif ($state == 2) {# look for head: lines, and include content
 if (/$doc_sect/o) {
$newsection = $1;
$newcontents = $2;

if (($contents ne "") && ($contents ne "\n")) {
 if (!$in_doc_sect && $verbose) {
print STDERR "Warning(${file}:$.): contents before sections\n";
++$warnings;
 }
 dump_section($file, $section, xml_escape($contents));
 $section = $section_default;
}

$in_doc_sect = 1;
$contents = $newcontents;
if ($contents ne "") {
 while ((substr($contents, 0, 1) eq " ") ||
substr($contents, 0, 1) eq "\t") {
 $contents = substr($contents, 1);
 }
 $contents .= "\n";
}
$section = $newsection;
 } elsif (/$doc_end/) {

if ($contents ne "") {
 dump_section($file, $section, xml_escape($contents));
 $section = $section_default;
 $contents = "";
}
# look for doc_com + <text> + doc_end:
if ($_ =~ m'\s*\*\s*[a-zA-Z_0-9:\.]+\*/') {
 print STDERR "Warning(${file}:$.): suspicious ending line: $_";
 ++$warnings;
}

$prototype = "";
$state = 3;
$brcount = 0;
#	print STDERR "end of doc comment, looking for prototype\n";
 } elsif (/$doc_content/) {
# miguel-style comment kludge, look for blank lines after
# @parameter line to signify start of description
if ($1 eq "" &&
($section =~ m/^@/ || $section eq $section_context)) {
 dump_section($file, $section, xml_escape($contents));
 $section = $section_default;
 $contents = "";
} else {
 $contents .= $1."\n";
}
 } else {
# i dont know - bad line? ignore.
print STDERR "Warning(${file}:$.): bad line: $_";
++$warnings;
 }
} elsif ($state == 3) {	# scanning for function '{' (end of prototype)
 if ($decl_type eq 'function') {
process_state3_function($_, $file);
 } else {
process_state3_type($_, $file);
 }
} elsif ($state == 4) {
# Documentation block
if (/$doc_block/) {
dump_doc_section($file, $section, xml_escape($contents));
$contents = "";
$function = "";
%constants = ();
%parameterdescs = ();
%parametertypes = ();
@parameterlist = ();
%sections = ();
@sectionlist = ();
$prototype = "";
if ( $1 eq "" ) {
$section = $section_intro;
} else {
$section = $1;
}
}
elsif (/$doc_end/)
{
dump_doc_section($file, $section, xml_escape($contents));
$contents = "";
$function = "";
%constants = ();
%parameterdescs = ();
%parametertypes = ();
@parameterlist = ();
%sections = ();
@sectionlist = ();
$prototype = "";
$state = 0;
}
elsif (/$doc_content/)
{
if ( $1 eq "" )
{
$contents .= $blankline;
}
else
{
$contents .= $1 . "\n";
}
}
}
 }
 if ($initial_section_counter == $section_counter) {
print STDERR "Warning(${file}): no structured comments found\n";
if ($output_mode eq "xml") {
 # The template wants at least one RefEntry here; make one.
 print "<refentry>\n";
 print " <refnamediv>\n";
 print " <refname>\n";
 print " ${file}\n";
 print " </refname>\n";
 print " <refpurpose>\n";
 print " Document generation inconsistency\n";
 print " </refpurpose>\n";
 print " </refnamediv>\n";
 print " <refsect1>\n";
 print " <title>\n";
 print " Oops\n";
 print " </title>\n";
 print " <warning>\n";
 print " <para>\n";
 print " The template for this document tried to insert\n";
 print " the structured comment from the file\n";
 print " <filename>${file}</filename> at this point,\n";
 print " but none was found.\n";
 print " This dummy section is inserted to allow\n";
 print " generation to continue.\n";
 print " </para>\n";
 print " </warning>\n";
 print " </refsect1>\n";
 print "</refentry>\n";
}
 }
}