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#!/usr/bin/env perl
# SPDX-License-Identifier: GPL-2.0
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use warnings;
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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) 2005-2012  Randy Dunlap                         ##
## Copyright (C) 2012  Dan Luedtke                               ##
## 								 ##
## #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             ##

# 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>

# 25/07/2012 - Added support for HTML5
# -- Dan Luedtke <mail@danrl.de>

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sub usage {
    my $message = <<"EOF";
Usage: $0 [OPTION ...] FILE ...

Read C language source or header FILEs, extract embedded documentation comments,
and print formatted documentation to standard output.

The documentation comments are identified by "/**" opening comment mark. See
Documentation/doc-guide/kernel-doc.rst for the documentation comment syntax.

Output format selection (mutually exclusive):
  -man			Output troff manual page format. This is the default.
  -rst			Output reStructuredText format.
  -none			Do not output documentation, only warnings.

Output selection (mutually exclusive):
  -export		Only output documentation for symbols that have been
			exported using EXPORT_SYMBOL() or EXPORT_SYMBOL_GPL()
                        in any input FILE or -export-file FILE.
  -internal		Only output documentation for symbols that have NOT been
			exported using EXPORT_SYMBOL() or EXPORT_SYMBOL_GPL()
                        in any input FILE or -export-file FILE.
  -function NAME	Only output documentation for the given function(s)
			or DOC: section title(s). All other functions and DOC:
			sections are ignored. May be specified multiple times.
  -nofunction NAME	Do NOT output documentation for the given function(s);
			only output documentation for the other functions and
			DOC: sections. May be specified multiple times.

Output selection modifiers:
  -no-doc-sections	Do not output DOC: sections.
  -enable-lineno        Enable output of #define LINENO lines. Only works with
                        reStructuredText format.
  -export-file FILE     Specify an additional FILE in which to look for
                        EXPORT_SYMBOL() and EXPORT_SYMBOL_GPL(). To be used with
                        -export or -internal. May be specified multiple times.

Other parameters:
  -v			Verbose output, more warnings and other information.
  -h			Print this help.

EOF
    print $message;
    exit 1;
}
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#
# 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.
#
# Besides 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.
#
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# For really longs structs, you can also describe arguments inside the
# body of the struct.
# eg.
# /**
#  * struct my_struct - short description
#  * @a: first member
#  * @b: second member
#  *
#  * Longer description
#  */
# struct my_struct {
#     int a;
#     int b;
#     /**
#      * @c: This is longer description of C
#      *
#      * You can use paragraphs to describe arguments
#      * using this method.
#      */
#     int c;
# };
#
# This should be use only for struct/enum members.
#
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# 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.
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# A non-void function should have a "Return:" section describing the return
# value(s).
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# 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')
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# '&struct_name.member' - name of a structure member
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# '@parameter' - name of a parameter
# '%CONST' - name of a constant.
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# '``LITERAL``' - literal string without any spaces on it.
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## init lots of data

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

# match expressions used to find embedded type information
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my $type_constant = '\b``([^\`]+)``\b';
my $type_constant2 = '\%([-_\w]+)';
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my $type_func = '(\w+)\(\)';
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my $type_param = '\@(\w*((\.\w+)|(->\w+))*(\.\.\.)?)';
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my $type_fp_param = '\@(\w+)\(\)';  # Special RST handling for func ptr params
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my $type_env = '(\$\w+)';
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my $type_enum = '\&(enum\s*([_\w]+))';
my $type_struct = '\&(struct\s*([_\w]+))';
my $type_typedef = '\&(typedef\s*([_\w]+))';
my $type_union = '\&(union\s*([_\w]+))';
my $type_member = '\&([_\w]+)(\.|->)([_\w]+)';
my $type_fallback = '\&([_\w]+)';
my $type_member_func = $type_member . '\(\)';
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# Output conversion substitutions.
#  One for each output format

# these are pretty rough
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my @highlights_man = (
                      [$type_constant, "\$1"],
                      [$type_constant2, "\$1"],
                      [$type_func, "\\\\fB\$1\\\\fP"],
                      [$type_enum, "\\\\fI\$1\\\\fP"],
                      [$type_struct, "\\\\fI\$1\\\\fP"],
                      [$type_typedef, "\\\\fI\$1\\\\fP"],
                      [$type_union, "\\\\fI\$1\\\\fP"],
                      [$type_param, "\\\\fI\$1\\\\fP"],
                      [$type_member, "\\\\fI\$1\$2\$3\\\\fP"],
                      [$type_fallback, "\\\\fI\$1\\\\fP"]
		     );
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my $blankline_man = "";

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# rst-mode
my @highlights_rst = (
                       [$type_constant, "``\$1``"],
                       [$type_constant2, "``\$1``"],
                       # Note: need to escape () to avoid func matching later
                       [$type_member_func, "\\:c\\:type\\:`\$1\$2\$3\\\\(\\\\) <\$1>`"],
                       [$type_member, "\\:c\\:type\\:`\$1\$2\$3 <\$1>`"],
		       [$type_fp_param, "**\$1\\\\(\\\\)**"],
                       [$type_func, "\\:c\\:func\\:`\$1()`"],
                       [$type_enum, "\\:c\\:type\\:`\$1 <\$2>`"],
                       [$type_struct, "\\:c\\:type\\:`\$1 <\$2>`"],
                       [$type_typedef, "\\:c\\:type\\:`\$1 <\$2>`"],
                       [$type_union, "\\:c\\:type\\:`\$1 <\$2>`"],
                       # in rst this can refer to any type
                       [$type_fallback, "\\:c\\:type\\:`\$1`"],
                       [$type_param, "**\$1**"]
		      );
my $blankline_rst = "\n";
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# read arguments
if ($#ARGV == -1) {
    usage();
}

my $kernelversion;
my $dohighlight = "";

my $verbose = 0;
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my $output_mode = "rst";
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my $output_preformatted = 0;
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my $no_doc_sections = 0;
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my $enable_lineno = 0;
my @highlights = @highlights_rst;
my $blankline = $blankline_rst;
my $modulename = "Kernel API";

use constant {
    OUTPUT_ALL          => 0, # output all symbols and doc sections
    OUTPUT_INCLUDE      => 1, # output only specified symbols
    OUTPUT_EXCLUDE      => 2, # output everything except specified symbols
    OUTPUT_EXPORTED     => 3, # output exported symbols
    OUTPUT_INTERNAL     => 4, # output non-exported symbols
};
my $output_selection = OUTPUT_ALL;
my $show_not_found = 0;

my @export_file_list;

my @build_time;
if (defined($ENV{'KBUILD_BUILD_TIMESTAMP'}) &&
    (my $seconds = `date -d"${ENV{'KBUILD_BUILD_TIMESTAMP'}}" +%s`) ne '') {
    @build_time = gmtime($seconds);
} else {
    @build_time = localtime;
}

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my $man_date = ('January', 'February', 'March', 'April', 'May', 'June',
		'July', 'August', 'September', 'October',
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		'November', 'December')[$build_time[4]] .
  " " . ($build_time[5]+1900);
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# Essentially these are globals.
# They probably want to be tidied up, made more localised or something.
# CAVEAT EMPTOR!  Some of the others I localised may not want to be, which
# could cause "use of undefined value" or other bugs.
my ($function, %function_table, %parametertypes, $declaration_purpose);
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my $declaration_start_line;
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my ($type, $declaration_name, $return_type);
my ($newsection, $newcontents, $prototype, $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="";

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# Parser states
use constant {
    STATE_NORMAL        => 0, # normal code
    STATE_NAME          => 1, # looking for function name
    STATE_BODY_MAYBE    => 2, # body - or maybe more description
    STATE_BODY          => 3, # the body of the comment
    STATE_PROTO         => 4, # scanning prototype
    STATE_DOCBLOCK      => 5, # documentation block
    STATE_INLINE        => 6, # gathering documentation outside main block
};
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my $state;
my $in_doc_sect;
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my $leading_space;

# Inline documentation state
use constant {
    STATE_INLINE_NA     => 0, # not applicable ($state != STATE_INLINE)
    STATE_INLINE_NAME   => 1, # looking for member name (@foo:)
    STATE_INLINE_TEXT   => 2, # looking for member documentation
    STATE_INLINE_END    => 3, # done
    STATE_INLINE_ERROR  => 4, # error - Comment without header was found.
                              # Spit a warning as it's not
                              # proper kernel-doc and ignore the rest.
};
my $inline_doc_state;
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#declaration types: can be
# 'function', 'struct', 'union', 'enum', 'typedef'
my $decl_type;

my $doc_start = '^/\*\*\s*$'; # Allow whitespace at end of comment start.
my $doc_end = '\*/';
my $doc_com = '\s*\*\s*';
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my $doc_com_body = '\s*\* ?';
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my $doc_decl = $doc_com . '(\w+)';
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# @params and a strictly limited set of supported section names
my $doc_sect = $doc_com .
    '\s*(\@[.\w]+|\@\.\.\.|description|context|returns?|notes?|examples?)\s*:(.*)';
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my $doc_content = $doc_com_body . '(.*)';
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my $doc_block = $doc_com . 'DOC:\s*(.*)?';
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my $doc_inline_start = '^\s*/\*\*\s*$';
my $doc_inline_sect = '\s*\*\s*(@\s*[\w][\w\.]*\s*):(.*)';
my $doc_inline_end = '^\s*\*/\s*$';
my $doc_inline_oneline = '^\s*/\*\*\s*(@[\w\s]+):\s*(.*)\s*\*/\s*$';
my $export_symbol = '^\s*EXPORT_SYMBOL(_GPL)?\s*\(\s*(\w+)\s*\)\s*;';
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my %parameterdescs;
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my %parameterdesc_start_lines;
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my @parameterlist;
my %sections;
my @sectionlist;
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my %section_start_lines;
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my $sectcheck;
my $struct_actual;

my $contents = "";
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my $new_start_line = 0;

# the canonical section names. see also $doc_sect above.
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my $section_default = "Description";	# default section
my $section_intro = "Introduction";
my $section = $section_default;
my $section_context = "Context";
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my $section_return = "Return";
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my $undescribed = "-- undescribed --";

reset_state();

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while ($ARGV[0] =~ m/^--?(.*)/) {
    my $cmd = $1;
    shift @ARGV;
    if ($cmd eq "man") {
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	$output_mode = "man";
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	@highlights = @highlights_man;
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	$blankline = $blankline_man;
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    } elsif ($cmd eq "rst") {
	$output_mode = "rst";
	@highlights = @highlights_rst;
	$blankline = $blankline_rst;
    } elsif ($cmd eq "none") {
	$output_mode = "none";
    } elsif ($cmd eq "module") { # not needed for XML, inherits from calling document
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	$modulename = shift @ARGV;
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    } elsif ($cmd eq "function") { # to only output specific functions
	$output_selection = OUTPUT_INCLUDE;
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	$function = shift @ARGV;
	$function_table{$function} = 1;
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    } elsif ($cmd eq "nofunction") { # output all except specific functions
	$output_selection = OUTPUT_EXCLUDE;
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	$function = shift @ARGV;
	$function_table{$function} = 1;
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    } elsif ($cmd eq "export") { # only exported symbols
	$output_selection = OUTPUT_EXPORTED;
	%function_table = ();
    } elsif ($cmd eq "internal") { # only non-exported symbols
	$output_selection = OUTPUT_INTERNAL;
	%function_table = ();
    } elsif ($cmd eq "export-file") {
	my $file = shift @ARGV;
	push(@export_file_list, $file);
    } elsif ($cmd eq "v") {
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	$verbose = 1;
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    } elsif (($cmd eq "h") || ($cmd eq "help")) {
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	usage();
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    } elsif ($cmd eq 'no-doc-sections') {
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	    $no_doc_sections = 1;
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    } elsif ($cmd eq 'enable-lineno') {
	    $enable_lineno = 1;
    } elsif ($cmd eq 'show-not-found') {
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	$show_not_found = 1;
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    } else {
	# Unknown argument
        usage();
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    }
}

# continue execution near EOF;

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

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

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#
sub print_lineno {
    my $lineno = shift;
    if ($enable_lineno && defined($lineno)) {
        print "#define LINENO " . $lineno . "\n";
    }
}
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##
# dumps section contents to arrays/hashes intended for that purpose.
#
sub dump_section {
    my $file = shift;
    my $name = shift;
    my $contents = join "\n", @_;

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    if ($name =~ m/$type_param/) {
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	$name = $1;
	$parameterdescs{$name} = $contents;
	$sectcheck = $sectcheck . $name . " ";
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        $parameterdesc_start_lines{$name} = $new_start_line;
        $new_start_line = 0;
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    } elsif ($name eq "@\.\.\.") {
	$name = "...";
	$parameterdescs{$name} = $contents;
	$sectcheck = $sectcheck . $name . " ";
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        $parameterdesc_start_lines{$name} = $new_start_line;
        $new_start_line = 0;
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    } else {
	if (defined($sections{$name}) && ($sections{$name} ne "")) {
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	    # Only warn on user specified duplicate section names.
	    if ($name ne $section_default) {
		print STDERR "${file}:$.: warning: duplicate section name '$name'\n";
		++$warnings;
	    }
	    $sections{$name} .= $contents;
	} else {
	    $sections{$name} = $contents;
	    push @sectionlist, $name;
            $section_start_lines{$name} = $new_start_line;
            $new_start_line = 0;
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	}
    }
}

##
# 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) {
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        return;
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    }

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    if (($output_selection == OUTPUT_ALL) ||
	($output_selection == OUTPUT_INCLUDE &&
	 defined($function_table{$name})) ||
	($output_selection == OUTPUT_EXCLUDE &&
	 !defined($function_table{$name})))
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    {
	dump_section($file, $name, $contents);
	output_blockhead({'sectionlist' => \@sectionlist,
			  'sections' => \%sections,
			  'module' => $modulename,
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			  'content-only' => ($output_selection != OUTPUT_ALL), });
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    }
}

##
# 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";
#   }

#   print STDERR "contents b4:$contents\n";
    eval $dohighlight;
    die $@ if $@;
#   print STDERR "contents af:$contents\n";

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

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

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

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

670
    print ".TH \"$args{'module'}\" 9 \"" . $args{'type'} . " " . $args{'struct'} . "\" \"$man_date\" \"API Manual\" LINUX\n";
671 672 673 674

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

675 676 677
    my $declaration = $args{'definition'};
    $declaration =~ s/\t/  /g;
    $declaration =~ s/\n/"\n.br\n.BI \"/g;
678 679
    print ".SH SYNOPSIS\n";
    print $args{'type'} . " " . $args{'struct'} . " {\n.br\n";
680
    print ".BI \"$declaration\n};\n.br\n\n";
681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704

    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);

705
    print ".TH \"$args{'module'}\" 9 \"$args{'typedef'}\" \"$man_date\" \"API Manual\" LINUX\n";
706 707 708 709 710 711 712 713 714 715 716 717 718 719 720

    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;

721
    print ".TH \"$args{'module'}\" 9 \"$args{'module'}\" \"$man_date\" \"API Manual\" LINUX\n";
722 723 724 725 726 727 728 729

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

##
730 731 732 733 734 735 736 737 738
# output in restructured text
#

#
# This could use some work; it's used to output the DOC: sections, and
# starts by putting out the name of the doc section itself, but that tends
# to duplicate a header already in the template file.
#
sub output_blockhead_rst(%) {
739 740 741
    my %args = %{$_[0]};
    my ($parameter, $section);

742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821
    foreach $section (@{$args{'sectionlist'}}) {
	if ($output_selection != OUTPUT_INCLUDE) {
	    print "**$section**\n\n";
	}
        print_lineno($section_start_lines{$section});
	output_highlight_rst($args{'sections'}{$section});
	print "\n";
    }
}

#
# Apply the RST highlights to a sub-block of text.
#
sub highlight_block($) {
    # The dohighlight kludge requires the text be called $contents
    my $contents = shift;
    eval $dohighlight;
    die $@ if $@;
    return $contents;
}

#
# Regexes used only here.
#
my $sphinx_literal = '^[^.].*::$';
my $sphinx_cblock = '^\.\.\ +code-block::';

sub output_highlight_rst {
    my $input = join "\n",@_;
    my $output = "";
    my $line;
    my $in_literal = 0;
    my $litprefix;
    my $block = "";

    foreach $line (split "\n",$input) {
	#
	# If we're in a literal block, see if we should drop out
	# of it.  Otherwise pass the line straight through unmunged.
	#
	if ($in_literal) {
	    if (! ($line =~ /^\s*$/)) {
		#
		# If this is the first non-blank line in a literal
		# block we need to figure out what the proper indent is.
		#
		if ($litprefix eq "") {
		    $line =~ /^(\s*)/;
		    $litprefix = '^' . $1;
		    $output .= $line . "\n";
		} elsif (! ($line =~ /$litprefix/)) {
		    $in_literal = 0;
		} else {
		    $output .= $line . "\n";
		}
	    } else {
		$output .= $line . "\n";
	    }
	}
	#
	# Not in a literal block (or just dropped out)
	#
	if (! $in_literal) {
	    $block .= $line . "\n";
	    if (($line =~ /$sphinx_literal/) || ($line =~ /$sphinx_cblock/)) {
		$in_literal = 1;
		$litprefix = "";
		$output .= highlight_block($block);
		$block = ""
	    }
	}
    }

    if ($block) {
	$output .= highlight_block($block);
    }
    foreach $line (split "\n", $output) {
	print $lineprefix . $line . "\n";
    }
}
822

823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838
sub output_function_rst(%) {
    my %args = %{$_[0]};
    my ($parameter, $section);
    my $oldprefix = $lineprefix;
    my $start = "";

    if ($args{'typedef'}) {
	print ".. c:type:: ". $args{'function'} . "\n\n";
	print_lineno($declaration_start_line);
	print "   **Typedef**: ";
	$lineprefix = "";
	output_highlight_rst($args{'purpose'});
	$start = "\n\n**Syntax**\n\n  ``";
    } else {
	print ".. c:function:: ";
    }
839
    if ($args{'functiontype'} ne "") {
840
	$start .= $args{'functiontype'} . " " . $args{'function'} . " (";
841
    } else {
842
	$start .= $args{'function'} . " (";
843 844 845 846 847
    }
    print $start;

    my $count = 0;
    foreach my $parameter (@{$args{'parameterlist'}}) {
848 849 850 851
	if ($count ne 0) {
	    print ", ";
	}
	$count++;
852
	$type = $args{'parametertypes'}{$parameter};
853

854 855 856 857 858 859
	if ($type =~ m/([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)/) {
	    # pointer-to-function
	    print $1 . $parameter . ") (" . $2;
	} else {
	    print $type . " " . $parameter;
	}
860 861 862 863 864 865 866 867 868
    }
    if ($args{'typedef'}) {
	print ");``\n\n";
    } else {
	print ")\n\n";
	print_lineno($declaration_start_line);
	$lineprefix = "   ";
	output_highlight_rst($args{'purpose'});
	print "\n";
869 870
    }

871 872
    print "**Parameters**\n\n";
    $lineprefix = "  ";
873 874 875
    foreach $parameter (@{$args{'parameterlist'}}) {
	my $parameter_name = $parameter;
	$parameter_name =~ s/\[.*//;
876 877 878 879 880 881 882 883 884
	$type = $args{'parametertypes'}{$parameter};

	if ($type ne "") {
	    print "``$type $parameter``\n";
	} else {
	    print "``$parameter``\n";
	}

        print_lineno($parameterdesc_start_lines{$parameter_name});
885

886 887 888 889 890 891 892
	if (defined($args{'parameterdescs'}{$parameter_name}) &&
	    $args{'parameterdescs'}{$parameter_name} ne $undescribed) {
	    output_highlight_rst($args{'parameterdescs'}{$parameter_name});
	} else {
	    print "  *undescribed*\n";
	}
	print "\n";
893
    }
894 895 896

    $lineprefix = $oldprefix;
    output_section_rst(@_);
897 898
}

899
sub output_section_rst(%) {
900 901
    my %args = %{$_[0]};
    my $section;
902 903
    my $oldprefix = $lineprefix;
    $lineprefix = "";
904 905

    foreach $section (@{$args{'sectionlist'}}) {
906 907 908 909
	print "**$section**\n\n";
        print_lineno($section_start_lines{$section});
	output_highlight_rst($args{'sections'}{$section});
	print "\n";
910
    }
911 912
    print "\n";
    $lineprefix = $oldprefix;
913 914
}

915
sub output_enum_rst(%) {
916 917
    my %args = %{$_[0]};
    my ($parameter);
918
    my $oldprefix = $lineprefix;
919
    my $count;
920
    my $name = "enum " . $args{'enum'};
921

922 923 924 925 926 927 928 929
    print "\n\n.. c:type:: " . $name . "\n\n";
    print_lineno($declaration_start_line);
    $lineprefix = "   ";
    output_highlight_rst($args{'purpose'});
    print "\n";

    print "**Constants**\n\n";
    $lineprefix = "  ";
930
    foreach $parameter (@{$args{'parameterlist'}}) {
931 932 933 934 935
	print "``$parameter``\n";
	if ($args{'parameterdescs'}{$parameter} ne $undescribed) {
	    output_highlight_rst($args{'parameterdescs'}{$parameter});
	} else {
	    print "  *undescribed*\n";
936 937 938 939
	}
	print "\n";
    }

940 941
    $lineprefix = $oldprefix;
    output_section_rst(@_);
942 943
}

944
sub output_typedef_rst(%) {
945 946
    my %args = %{$_[0]};
    my ($parameter);
947 948 949 950 951 952 953 954
    my $oldprefix = $lineprefix;
    my $name = "typedef " . $args{'typedef'};

    print "\n\n.. c:type:: " . $name . "\n\n";
    print_lineno($declaration_start_line);
    $lineprefix = "   ";
    output_highlight_rst($args{'purpose'});
    print "\n";
955

956 957
    $lineprefix = $oldprefix;
    output_section_rst(@_);
958 959
}

960
sub output_struct_rst(%) {
961 962
    my %args = %{$_[0]};
    my ($parameter);
963 964
    my $oldprefix = $lineprefix;
    my $name = $args{'type'} . " " . $args{'struct'};
965

966 967 968 969 970
    print "\n\n.. c:type:: " . $name . "\n\n";
    print_lineno($declaration_start_line);
    $lineprefix = "   ";
    output_highlight_rst($args{'purpose'});
    print "\n";
971

972 973 974 975 976
    print "**Definition**\n\n";
    print "::\n\n";
    my $declaration = $args{'definition'};
    $declaration =~ s/\t/  /g;
    print "  " . $args{'type'} . " " . $args{'struct'} . " {\n$declaration  };\n\n";
977

978 979
    print "**Members**\n\n";
    $lineprefix = "  ";
980 981 982 983 984 985 986
    foreach $parameter (@{$args{'parameterlist'}}) {
	($parameter =~ /^#/) && next;

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

	($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
987 988 989 990 991
	$type = $args{'parametertypes'}{$parameter};
        print_lineno($parameterdesc_start_lines{$parameter_name});
	print "``" . $parameter . "``\n";
	output_highlight_rst($args{'parameterdescs'}{$parameter_name});
	print "\n";
992 993 994
    }
    print "\n";

995 996
    $lineprefix = $oldprefix;
    output_section_rst(@_);
997 998
}

999
## none mode output functions
1000

1001
sub output_function_none(%) {
1002 1003
}

1004
sub output_enum_none(%) {
1005 1006
}

1007
sub output_typedef_none(%) {
1008 1009
}

1010
sub output_struct_none(%) {
1011 1012
}

1013
sub output_blockhead_none(%) {
1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024
}

##
# 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}_$output_mode";
1025 1026 1027 1028 1029 1030 1031
    if (($output_selection == OUTPUT_ALL) ||
	(($output_selection == OUTPUT_INCLUDE ||
	  $output_selection == OUTPUT_EXPORTED) &&
	 defined($function_table{$name})) ||
	(($output_selection == OUTPUT_EXCLUDE ||
	  $output_selection == OUTPUT_INTERNAL) &&
	 !($functype eq "function" && defined($function_table{$name}))))
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
    {
	&$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;

1065
    if ($x =~ /(struct|union)\s+(\w+)\s*\{(.*)\}(\s*(__packed|__aligned|__attribute__\s*\(\([a-z0-9,_\s\(\)]*\)\)))*/) {
1066
	my $decl_type = $1;
1067 1068 1069 1070
	$declaration_name = $2;
	my $members = $3;

	# ignore members marked private:
1071 1072
	$members =~ s/\/\*\s*private:.*?\/\*\s*public:.*?\*\///gosi;
	$members =~ s/\/\*\s*private:.*//gosi;
1073 1074 1075
	# strip comments:
	$members =~ s/\/\*.*?\*\///gos;
	# strip attributes
1076 1077 1078
	$members =~ s/\s*__attribute__\s*\(\([a-z0-9,_\*\s\(\)]*\)\)//gi;
	$members =~ s/\s*__aligned\s*\([^;]*\)//gos;
	$members =~ s/\s*__packed\s*//gos;
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
	$members =~ s/\s*CRYPTO_MINALIGN_ATTR//gos;
	# replace DECLARE_BITMAP
	$members =~ s/DECLARE_BITMAP\s*\(([^,)]+),\s*([^,)]+)\)/unsigned long $1\[BITS_TO_LONGS($2)\]/gos;
	# replace DECLARE_HASHTABLE
	$members =~ s/DECLARE_HASHTABLE\s*\(([^,)]+),\s*([^,)]+)\)/unsigned long $1\[1 << (($2) - 1)\]/gos;
	# replace DECLARE_KFIFO
	$members =~ s/DECLARE_KFIFO\s*\(([^,)]+),\s*([^,)]+),\s*([^,)]+)\)/$2 \*$1/gos;
	# replace DECLARE_KFIFO_PTR
	$members =~ s/DECLARE_KFIFO_PTR\s*\(([^,)]+),\s*([^,)]+)\)/$2 \*$1/gos;

	my $declaration = $members;

	# Split nested struct/union elements as newer ones
	while ($members =~ m/(struct|union)([^\{\};]+)\{([^\{\}]*)\}([^\{\}\;]*)\;/) {
		my $newmember;
		my $maintype = $1;
		my $ids = $4;
		my $content = $3;
		foreach my $id(split /,/, $ids) {
			$newmember .= "$maintype $id; ";

			$id =~ s/[:\[].*//;
			$id =~ s/^\s*\**(\S+)\s*/$1/;
			foreach my $arg (split /;/, $content) {
				next if ($arg =~ m/^\s*$/);
				if ($arg =~ m/^([^\(]+\(\*?\s*)([\w\.]*)(\s*\).*)/) {
					# pointer-to-function
					my $type = $1;
					my $name = $2;
					my $extra = $3;
					next if (!$name);
					if ($id =~ m/^\s*$/) {
						# anonymous struct/union
						$newmember .= "$type$name$extra; ";
					} else {
						$newmember .= "$type$id.$name$extra; ";
					}
				} else {
					my $type;
					my $names;
					$arg =~ s/^\s+//;
					$arg =~ s/\s+$//;
					# Handle bitmaps
					$arg =~ s/:\s*\d+\s*//g;
					# Handle arrays
					$arg =~ s/\[.*\]//g;
					# The type may have multiple words,
					# and multiple IDs can be defined, like:
					#	const struct foo, *bar, foobar
					# So, we remove spaces when parsing the
					# names, in order to match just names
					# and commas for the names
					$arg =~ s/\s*,\s*/,/g;
					if ($arg =~ m/(.*)\s+([\S+,]+)/) {
						$type = $1;
						$names = $2;
					} else {
						$newmember .= "$arg; ";
						next;
					}
					foreach my $name (split /,/, $names) {
						$name =~ s/^\s*\**(\S+)\s*/$1/;
						next if (($name =~ m/^\s*$/));
						if ($id =~ m/^\s*$/) {
							# anonymous struct/union
							$newmember .= "$type $name; ";
						} else {
							$newmember .= "$type $id.$name; ";
						}
					}
				}
			}
		}
1152
		$members =~ s/(struct|union)([^\{\};]+)\{([^\{\}]*)\}([^\{\}\;]*)\;/$newmember/;
1153 1154 1155
	}

	# Ignore other nested elements, like enums
1156
	$members =~ s/(\{[^\{\}]*\})//g;
1157 1158 1159 1160 1161

	create_parameterlist($members, ';', $file, $declaration_name);
	check_sections($file, $declaration_name, $decl_type, $sectcheck, $struct_actual);

	# Adjust declaration for better display
1162 1163
	$declaration =~ s/([\{;])/$1\n/g;
	$declaration =~ s/\}\s+;/};/g;
1164
	# Better handle inlined enums
1165
	do {} while ($declaration =~ s/(enum\s+\{[^\}]+),([^\n])/$1,\n$2/);
1166 1167 1168 1169 1170 1171 1172 1173 1174

	my @def_args = split /\n/, $declaration;
	my $level = 1;
	$declaration = "";
	foreach my $clause (@def_args) {
		$clause =~ s/^\s+//;
		$clause =~ s/\s+$//;
		$clause =~ s/\s+/ /;
		next if (!$clause);
1175
		$level-- if ($clause =~ m/(\})/ && $level > 1);
1176 1177 1178 1179
		if (!($clause =~ m/^\s*#/)) {
			$declaration .= "\t" x $level;
		}
		$declaration .= "\t" . $clause . "\n";
1180
		$level++ if ($clause =~ m/(\{)/ && !($clause =~m/\}/));
1181
	}
1182 1183 1184 1185
	output_declaration($declaration_name,
			   'struct',
			   {'struct' => $declaration_name,
			    'module' => $modulename,
1186
			    'definition' => $declaration,
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
			    'parameterlist' => \@parameterlist,
			    'parameterdescs' => \%parameterdescs,
			    'parametertypes' => \%parametertypes,
			    'sectionlist' => \@sectionlist,
			    'sections' => \%sections,
			    'purpose' => $declaration_purpose,
			    'type' => $decl_type
			   });
    }
    else {
1197
	print STDERR "${file}:$.: error: Cannot parse struct or union!\n";
1198 1199 1200 1201
	++$errors;
    }
}

1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239

sub show_warnings($$) {
	my $functype = shift;
	my $name = shift;

	return 1 if ($output_selection == OUTPUT_ALL);

	if ($output_selection == OUTPUT_EXPORTED) {
		if (defined($function_table{$name})) {
			return 1;
		} else {
			return 0;
		}
	}
        if ($output_selection == OUTPUT_INTERNAL) {
		if (!($functype eq "function" && defined($function_table{$name}))) {
			return 1;
		} else {
			return 0;
		}
	}
	if ($output_selection == OUTPUT_INCLUDE) {
		if (defined($function_table{$name})) {
			return 1;
		} else {
			return 0;
		}
	}
	if ($output_selection == OUTPUT_EXCLUDE) {
		if (!defined($function_table{$name})) {
			return 1;
		} else {
			return 0;
		}
	}
	die("Please add the new output type at show_warnings()");
}

1240 1241 1242 1243 1244
sub dump_enum($$) {
    my $x = shift;
    my $file = shift;

    $x =~ s@/\*.*?\*/@@gos;	# strip comments.
1245 1246
    # strip #define macros inside enums
    $x =~ s@#\s*((define|ifdef)\s+|endif)[^;]*;@@gos;
1247

1248
    if ($x =~ /enum\s+(\w+)\s*\{(.*)\}/) {
1249 1250
	$declaration_name = $1;
	my $members = $2;
1251 1252 1253
	my %_members;

	$members =~ s/\s+$//;
1254 1255 1256 1257 1258 1259

	foreach my $arg (split ',', $members) {
	    $arg =~ s/^\s*(\w+).*/$1/;
	    push @parameterlist, $arg;
	    if (!$parameterdescs{$arg}) {
		$parameterdescs{$arg} = $undescribed;
1260 1261 1262
	        if (show_warnings("enum", $declaration_name)) {
			print STDERR "${file}:$.: warning: Enum value '$arg' not described in enum '$declaration_name'\n";
		}
1263
	    }
1264
	    $_members{$arg} = 1;
1265 1266
	}

1267 1268 1269 1270 1271 1272 1273 1274
	while (my ($k, $v) = each %parameterdescs) {
	    if (!exists($_members{$k})) {
	        if (show_warnings("enum", $declaration_name)) {
		     print STDERR "${file}:$.: warning: Excess enum value '$k' description in '$declaration_name'\n";
		}
	    }
        }

1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286
	output_declaration($declaration_name,
			   'enum',
			   {'enum' => $declaration_name,
			    'module' => $modulename,
			    'parameterlist' => \@parameterlist,
			    'parameterdescs' => \%parameterdescs,
			    'sectionlist' => \@sectionlist,
			    'sections' => \%sections,
			    'purpose' => $declaration_purpose
			   });
    }
    else {
1287
	print STDERR "${file}:$.: error: Cannot parse enum!\n";
1288 1289 1290 1291 1292 1293 1294 1295 1296
	++$errors;
    }
}

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

    $x =~ s@/\*.*?\*/@@gos;	# strip comments.
1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324

    # Parse function prototypes
    if ($x =~ /typedef\s+(\w+)\s*\(\*\s*(\w\S+)\s*\)\s*\((.*)\);/ ||
	$x =~ /typedef\s+(\w+)\s*(\w\S+)\s*\s*\((.*)\);/) {

	# Function typedefs
	$return_type = $1;
	$declaration_name = $2;
	my $args = $3;

	create_parameterlist($args, ',', $file, $declaration_name);

	output_declaration($declaration_name,
			   'function',
			   {'function' => $declaration_name,
			    'typedef' => 1,
			    'module' => $modulename,
			    'functiontype' => $return_type,
			    'parameterlist' => \@parameterlist,
			    'parameterdescs' => \%parameterdescs,
			    'parametertypes' => \%parametertypes,
			    'sectionlist' => \@sectionlist,
			    'sections' => \%sections,
			    'purpose' => $declaration_purpose
			   });
	return;
    }

1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342
    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' => $declaration_purpose
			   });
    }
    else {
1343
	print STDERR "${file}:$.: error: Cannot parse typedef!\n";
1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
	++$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 . " ";
}

1356
sub create_parameterlist($$$$) {
1357 1358 1359
    my $args = shift;
    my $splitter = shift;
    my $file = shift;
1360
    my $declaration_name = shift;
1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384
    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/#/,/;
1385
	    $arg =~ m/[^\(]+\([\w\s]*\*?\s*([\w\.]*)\s*\)/;
1386 1387 1388 1389
	    $param = $1;
	    $type = $arg;
	    $type =~ s/([^\(]+\(\*?)\s*$param/$1/;
	    save_struct_actual($param);
1390
	    push_parameter($param, $type, $file, $declaration_name);
1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414
	} elsif ($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);
1415
		    push_parameter($2, "$type $1", $file, $declaration_name);
1416 1417 1418 1419
		}
		elsif ($param =~ m/(.*?):(\d+)/) {
		    if ($type ne "") { # skip unnamed bit-fields
			save_struct_actual($1);
1420
			push_parameter($1, "$type:$2", $file, $declaration_name)
1421 1422 1423 1424
		    }
		}
		else {
		    save_struct_actual($param);
1425
		    push_parameter($param, $type, $file, $declaration_name);
1426 1427 1428 1429 1430 1431
		}
	    }
	}
    }
}

1432
sub push_parameter($$$$) {
1433 1434 1435
	my $param = shift;
	my $type = shift;
	my $file = shift;
1436
	my $declaration_name = shift;
1437 1438 1439 1440 1441 1442 1443

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

	$anon_struct_union = 0;
1444
	$param =~ s/[\[\)].*//;
1445 1446 1447

	if ($type eq "" && $param =~ /\.\.\.$/)
	{
1448 1449 1450 1451
	    if (!$param =~ /\w\.\.\.$/) {
	      # handles unnamed variable parameters
	      $param = "...";
	    }
1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472
	    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);
1473 1474 1475
	# Note: It will also ignore void params and unnamed structs/unions
	if (!defined $parameterdescs{$param} && $param !~ /^#/) {
		$parameterdescs{$param} = $undescribed;
1476

1477
	        if (show_warnings($type, $declaration_name) && $param !~ /\./) {
1478 1479 1480 1481
			print STDERR
			      "${file}:$.: warning: Function parameter or member '$param' not described in '$declaration_name'\n";
			++$warnings;
		}
1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493
	}

	# strip spaces from $param so that it is one continuous string
	# on @parameterlist;
	# this fixes a problem where check_sections() cannot find
	# a parameter like "addr[6 + 2]" because it actually appears
	# as "addr[6", "+", "2]" on the parameter list;
	# but it's better to maintain the param string unchanged for output,
	# so just weaken the string compare in check_sections() to ignore
	# "[blah" in a parameter string;
	###$param =~ s/\s*//g;
	push @parameterlist, $param;
1494
	$type =~ s/\s\s+/ /g;
1495 1496 1497
	$parametertypes{$param} = $type;
}

1498 1499
sub check_sections($$$$$) {
	my ($file, $decl_name, $decl_type, $sectcheck, $prmscheck) = @_;
1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527
	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\(\)]*\)\)//i;
			# ignore array size in a parameter string;
			# however, the original param string may contain
			# spaces, e.g.:  addr[6 + 2]
			# and this appears in @prms as "addr[6" since the
			# parameter list is split at spaces;
			# hence just ignore "[..." for the sections check;
			$prm_clean =~ s/\[.*//;

			##$prm_clean =~ s/^\**//;
			if ($prm_clean eq $sects[$sx]) {
				$err = 0;
				last;
			}
		}
		if ($err) {
			if ($decl_type eq "function") {
1528
				print STDERR "${file}:$.: warning: " .
1529 1530 1531 1532 1533 1534 1535 1536 1537
					"Excess function parameter " .
					"'$sects[$sx]' " .
					"description in '$decl_name'\n";
				++$warnings;
			}
		}
	}
}

1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552
##
# Checks the section describing the return value of a function.
sub check_return_section {
        my $file = shift;
        my $declaration_name = shift;
        my $return_type = shift;

        # Ignore an empty return type (It's a macro)
        # Ignore functions with a "void" return type. (But don't ignore "void *")
        if (($return_type eq "") || ($return_type =~ /void\s*\w*\s*$/)) {
                return;
        }

        if (!defined($sections{$section_return}) ||
            $sections{$section_return} eq "") {
1553
                print STDERR "${file}:$.: warning: " .
1554 1555 1556 1557 1558 1559
                        "No description found for return value of " .
                        "'$declaration_name'\n";
                ++$warnings;
        }
}

1560 1561 1562 1563 1564 1565 1566
##
# 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;
1567
    my $noret = 0;
1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578

    $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/__init +//;
    $prototype =~ s/__init_or_module +//;
1579
    $prototype =~ s/__meminit +//;
1580 1581
    $prototype =~ s/__must_check +//;
    $prototype =~ s/__weak +//;
1582
    $prototype =~ s/__sched +//;
1583
    my $define = $prototype =~ s/^#\s*define\s+//; #ak added
1584 1585 1586 1587 1588 1589 1590
    $prototype =~ s/__attribute__\s*\(\(
            (?:
                 [\w\s]++          # attribute name
                 (?:\([^)]*+\))?   # attribute arguments
                 \s*+,?            # optional comma at the end
            )+
          \)\)\s+//x;
1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607

    # 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)

1608 1609 1610 1611 1612 1613 1614 1615 1616
    if ($define && $prototype =~ m/^()([a-zA-Z0-9_~:]+)\s+/) {
        # This is an object-like macro, it has no return type and no parameter
        # list.
        # Function-like macros are not allowed to have spaces between
        # declaration_name and opening parenthesis (notice the \s+).
        $return_type = $1;
        $declaration_name = $2;
        $noret = 1;
    } elsif ($prototype =~ m/^()([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
1617
	$prototype =~ m/^(\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
1618
	$prototype =~ m/^(\w+\s*\*+)\s*([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
1619 1620 1621
	$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*\(([^\(]*)\)/ ||
1622
	$prototype =~ m/^(\w+\s+\w+\s+\w+\s*\*+)\s*([a-zA-Z0-9_~:]+)\s*\(([^\(]*)\)/ ||
1623 1624
	$prototype =~ m/^()([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
	$prototype =~ m/^(\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
1625
	$prototype =~ m/^(\w+\s*\*+)\s*([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
1626
	$prototype =~ m/^(\w+\s+\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
1627
	$prototype =~ m/^(\w+\s+\w+\s*\*+)\s*([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
1628
	$prototype =~ m/^(\w+\s+\w+\s+\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
1629
	$prototype =~ m/^(\w+\s+\w+\s+\w+\s*\*+)\s*([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
1630
	$prototype =~ m/^(\w+\s+\w+\s+\w+\s+\w+)\s+([a-zA-Z0-9_~:]+)\s*\(([^\{]*)\)/ ||
1631 1632
	$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*\(([^\{]*)\)/)  {
1633 1634 1635 1636
	$return_type = $1;
	$declaration_name = $2;
	my $args = $3;

1637
	create_parameterlist($args, ',', $file, $declaration_name);
1638
    } else {
1639
	print STDERR "${file}:$.: warning: cannot understand function prototype: '$prototype'\n";
1640 1641 1642 1643
	return;
    }

	my $prms = join " ", @parameterlist;
1644
	check_sections($file, $declaration_name, "function", $sectcheck, $prms);
1645

1646 1647 1648 1649 1650
        # This check emits a lot of warnings at the moment, because many
        # functions don't have a 'Return' doc section. So until the number
        # of warnings goes sufficiently down, the check is only performed in
        # verbose mode.
        # TODO: always perform the check.
1651
        if ($verbose && !$noret) {
1652 1653 1654
                check_return_section($file, $declaration_name, $return_type);
        }

1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679
    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 reset_state {
    $function = "";
    %parameterdescs = ();
    %parametertypes = ();
    @parameterlist = ();
    %sections = ();
    @sectionlist = ();
    $sectcheck = "";
    $struct_actual = "";
    $prototype = "";

1680 1681
    $state = STATE_NORMAL;
    $inline_doc_state = STATE_INLINE_NA;
1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702
}

sub tracepoint_munge($) {
	my $file = shift;
	my $tracepointname = 0;
	my $tracepointargs = 0;

	if ($prototype =~ m/TRACE_EVENT\((.*?),/) {
		$tracepointname = $1;
	}
	if ($prototype =~ m/DEFINE_SINGLE_EVENT\((.*?),/) {
		$tracepointname = $1;
	}
	if ($prototype =~ m/DEFINE_EVENT\((.*?),(.*?),/) {
		$tracepointname = $2;
	}
	$tracepointname =~ s/^\s+//; #strip leading whitespace
	if ($prototype =~ m/TP_PROTO\((.*?)\)/) {
		$tracepointargs = $1;
	}
	if (($tracepointname eq 0) || ($tracepointargs eq 0)) {
1703
		print STDERR "${file}:$.: warning: Unrecognized tracepoint format: \n".
1704 1705 1706 1707 1708 1709 1710 1711 1712
			     "$prototype\n";
	} else {
		$prototype = "static inline void trace_$tracepointname($tracepointargs)";
	}
}

sub syscall_munge() {
	my $void = 0;

1713
	$prototype =~ s@[\r\n]+@ @gos; # strip newlines/CR's
1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743
##	if ($prototype =~ m/SYSCALL_DEFINE0\s*\(\s*(a-zA-Z0-9_)*\s*\)/) {
	if ($prototype =~ m/SYSCALL_DEFINE0/) {
		$void = 1;
##		$prototype = "long sys_$1(void)";
	}

	$prototype =~ s/SYSCALL_DEFINE.*\(/long sys_/; # fix return type & func name
	if ($prototype =~ m/long (sys_.*?),/) {
		$prototype =~ s/,/\(/;
	} elsif ($void) {
		$prototype =~ s/\)/\(void\)/;
	}

	# now delete all of the odd-number commas in $prototype
	# so that arg types & arg names don't have a comma between them
	my $count = 0;
	my $len = length($prototype);
	if ($void) {
		$len = 0;	# skip the for-loop
	}
	for (my $ix = 0; $ix < $len; $ix++) {
		if (substr($prototype, $ix, 1) eq ',') {
			$count++;
			if ($count % 2 == 1) {
				substr($prototype, $ix, 1) = ' ';
			}
		}
	}
}

1744
sub process_proto_function($$) {
1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773
    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 ||