--- /dev/null
+#!/usr/bin/perl -w
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+#
+# Copyright 2008 Sun Microsystems, Inc. All rights reserved.
+# Use is subject to license terms.
+#
+# @(#)cstyle 1.58 98/09/09 (from shannon)
+#ident "%Z%%M% %I% %E% SMI"
+#
+# cstyle - check for some common stylistic errors.
+#
+# cstyle is a sort of "lint" for C coding style.
+# It attempts to check for the style used in the
+# kernel, sometimes known as "Bill Joy Normal Form".
+#
+# There's a lot this can't check for, like proper indentation
+# of code blocks. There's also a lot more this could check for.
+#
+# A note to the non perl literate:
+#
+# perl regular expressions are pretty much like egrep
+# regular expressions, with the following special symbols
+#
+# \s any space character
+# \S any non-space character
+# \w any "word" character [a-zA-Z0-9_]
+# \W any non-word character
+# \d a digit [0-9]
+# \D a non-digit
+# \b word boundary (between \w and \W)
+# \B non-word boundary
+#
+
+require 5.0;
+use IO::File;
+use Getopt::Std;
+use strict;
+
+my $usage =
+"usage: cstyle [-chpvCP] [-o constructs] file ...
+ -c check continuation indentation inside functions
+ -h perform heuristic checks that are sometimes wrong
+ -p perform some of the more picky checks
+ -v verbose
+ -C don't check anything in header block comments
+ -P check for use of non-POSIX types
+ -o constructs
+ allow a comma-seperated list of optional constructs:
+ doxygen allow doxygen-style block comments (/** /*!)
+ splint allow splint-style lint comments (/*@ ... @*/)
+";
+
+my %opts;
+
+if (!getopts("cho:pvCP", \%opts)) {
+ print $usage;
+ exit 2;
+}
+
+my $check_continuation = $opts{'c'};
+my $heuristic = $opts{'h'};
+my $picky = $opts{'p'};
+my $verbose = $opts{'v'};
+my $ignore_hdr_comment = $opts{'C'};
+my $check_posix_types = $opts{'P'};
+
+my $doxygen_comments = 0;
+my $splint_comments = 0;
+
+if (defined($opts{'o'})) {
+ for my $x (split /,/, $opts{'o'}) {
+ if ($x eq "doxygen") {
+ $doxygen_comments = 1;
+ } elsif ($x eq "splint") {
+ $splint_comments = 1;
+ } else {
+ print "cstyle: unrecognized construct \"$x\"\n";
+ print $usage;
+ exit 2;
+ }
+ }
+}
+
+my ($filename, $line, $prev); # shared globals
+
+my $fmt;
+my $hdr_comment_start;
+
+if ($verbose) {
+ $fmt = "%s: %d: %s\n%s\n";
+} else {
+ $fmt = "%s: %d: %s\n";
+}
+
+if ($doxygen_comments) {
+ # doxygen comments look like "/*!" or "/**"; allow them.
+ $hdr_comment_start = qr/^\s*\/\*[\!\*]?$/;
+} else {
+ $hdr_comment_start = qr/^\s*\/\*$/;
+}
+
+# Note, following must be in single quotes so that \s and \w work right.
+my $typename = '(int|char|short|long|unsigned|float|double' .
+ '|\w+_t|struct\s+\w+|union\s+\w+|FILE)';
+
+# mapping of old types to POSIX compatible types
+my %old2posix = (
+ 'unchar' => 'uchar_t',
+ 'ushort' => 'ushort_t',
+ 'uint' => 'uint_t',
+ 'ulong' => 'ulong_t',
+ 'u_int' => 'uint_t',
+ 'u_short' => 'ushort_t',
+ 'u_long' => 'ulong_t',
+ 'u_char' => 'uchar_t',
+ 'quad' => 'quad_t'
+);
+
+my $lint_re = qr/\/\*(?:
+ ARGSUSED[0-9]*|NOTREACHED|LINTLIBRARY|VARARGS[0-9]*|
+ CONSTCOND|CONSTANTCOND|CONSTANTCONDITION|EMPTY|
+ FALLTHRU|FALLTHROUGH|LINTED.*?|PRINTFLIKE[0-9]*|
+ PROTOLIB[0-9]*|SCANFLIKE[0-9]*|CSTYLED.*?
+ )\*\//x;
+
+my $splint_re = qr/\/\*@.*?@\*\//x;
+
+my $warlock_re = qr/\/\*\s*(?:
+ VARIABLES\ PROTECTED\ BY|
+ MEMBERS\ PROTECTED\ BY|
+ ALL\ MEMBERS\ PROTECTED\ BY|
+ READ-ONLY\ VARIABLES:|
+ READ-ONLY\ MEMBERS:|
+ VARIABLES\ READABLE\ WITHOUT\ LOCK:|
+ MEMBERS\ READABLE\ WITHOUT\ LOCK:|
+ LOCKS\ COVERED\ BY|
+ LOCK\ UNNEEDED\ BECAUSE|
+ LOCK\ NEEDED:|
+ LOCK\ HELD\ ON\ ENTRY:|
+ READ\ LOCK\ HELD\ ON\ ENTRY:|
+ WRITE\ LOCK\ HELD\ ON\ ENTRY:|
+ LOCK\ ACQUIRED\ AS\ SIDE\ EFFECT:|
+ READ\ LOCK\ ACQUIRED\ AS\ SIDE\ EFFECT:|
+ WRITE\ LOCK\ ACQUIRED\ AS\ SIDE\ EFFECT:|
+ LOCK\ RELEASED\ AS\ SIDE\ EFFECT:|
+ LOCK\ UPGRADED\ AS\ SIDE\ EFFECT:|
+ LOCK\ DOWNGRADED\ AS\ SIDE\ EFFECT:|
+ FUNCTIONS\ CALLED\ THROUGH\ POINTER|
+ FUNCTIONS\ CALLED\ THROUGH\ MEMBER|
+ LOCK\ ORDER:
+ )/x;
+
+my $err_stat = 0; # exit status
+
+if ($#ARGV >= 0) {
+ foreach my $arg (@ARGV) {
+ my $fh = new IO::File $arg, "r";
+ if (!defined($fh)) {
+ printf "%s: can not open\n", $arg;
+ } else {
+ &cstyle($arg, $fh);
+ close $fh;
+ }
+ }
+} else {
+ &cstyle("<stdin>", *STDIN);
+}
+exit $err_stat;
+
+my $no_errs = 0; # set for CSTYLED-protected lines
+
+sub err($) {
+ my ($error) = @_;
+ unless ($no_errs) {
+ printf $fmt, $filename, $., $error, $line;
+ $err_stat = 1;
+ }
+}
+
+sub err_prefix($$) {
+ my ($prevline, $error) = @_;
+ my $out = $prevline."\n".$line;
+ unless ($no_errs) {
+ printf $fmt, $filename, $., $error, $out;
+ $err_stat = 1;
+ }
+}
+
+sub err_prev($) {
+ my ($error) = @_;
+ unless ($no_errs) {
+ printf $fmt, $filename, $. - 1, $error, $prev;
+ $err_stat = 1;
+ }
+}
+
+sub cstyle($$) {
+
+my ($fn, $filehandle) = @_;
+$filename = $fn; # share it globally
+
+my $in_cpp = 0;
+my $next_in_cpp = 0;
+
+my $in_comment = 0;
+my $in_header_comment = 0;
+my $comment_done = 0;
+my $in_warlock_comment = 0;
+my $in_function = 0;
+my $in_function_header = 0;
+my $in_declaration = 0;
+my $note_level = 0;
+my $nextok = 0;
+my $nocheck = 0;
+
+my $in_string = 0;
+
+my ($okmsg, $comment_prefix);
+
+$line = '';
+$prev = '';
+reset_indent();
+
+line: while (<$filehandle>) {
+ s/\r?\n$//; # strip return and newline
+
+ # save the original line, then remove all text from within
+ # double or single quotes, we do not want to check such text.
+
+ $line = $_;
+
+ #
+ # C allows strings to be continued with a backslash at the end of
+ # the line. We translate that into a quoted string on the previous
+ # line followed by an initial quote on the next line.
+ #
+ # (we assume that no-one will use backslash-continuation with character
+ # constants)
+ #
+ $_ = '"' . $_ if ($in_string && !$nocheck && !$in_comment);
+
+ #
+ # normal strings and characters
+ #
+ s/'([^\\']|\\[^xX0]|\\0[0-9]*|\\[xX][0-9a-fA-F]*)'/''/g;
+ s/"([^\\"]|\\.)*"/\"\"/g;
+
+ #
+ # detect string continuation
+ #
+ if ($nocheck || $in_comment) {
+ $in_string = 0;
+ } else {
+ #
+ # Now that all full strings are replaced with "", we check
+ # for unfinished strings continuing onto the next line.
+ #
+ $in_string =
+ (s/([^"](?:"")*)"([^\\"]|\\.)*\\$/$1""/ ||
+ s/^("")*"([^\\"]|\\.)*\\$/""/);
+ }
+
+ #
+ # figure out if we are in a cpp directive
+ #
+ $in_cpp = $next_in_cpp || /^\s*#/; # continued or started
+ $next_in_cpp = $in_cpp && /\\$/; # only if continued
+
+ # strip off trailing backslashes, which appear in long macros
+ s/\s*\\$//;
+
+ # an /* END CSTYLED */ comment ends a no-check block.
+ if ($nocheck) {
+ if (/\/\* *END *CSTYLED *\*\//) {
+ $nocheck = 0;
+ } else {
+ reset_indent();
+ next line;
+ }
+ }
+
+ # a /*CSTYLED*/ comment indicates that the next line is ok.
+ if ($nextok) {
+ if ($okmsg) {
+ err($okmsg);
+ }
+ $nextok = 0;
+ $okmsg = 0;
+ if (/\/\* *CSTYLED.*\*\//) {
+ /^.*\/\* *CSTYLED *(.*) *\*\/.*$/;
+ $okmsg = $1;
+ $nextok = 1;
+ }
+ $no_errs = 1;
+ } elsif ($no_errs) {
+ $no_errs = 0;
+ }
+
+ # check length of line.
+ # first, a quick check to see if there is any chance of being too long.
+ if (($line =~ tr/\t/\t/) * 7 + length($line) > 80) {
+ # yes, there is a chance.
+ # replace tabs with spaces and check again.
+ my $eline = $line;
+ 1 while $eline =~
+ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e;
+ if (length($eline) > 80) {
+ err("line > 80 characters");
+ }
+ }
+
+ # ignore NOTE(...) annotations (assumes NOTE is on lines by itself).
+ if ($note_level || /\b_?NOTE\s*\(/) { # if in NOTE or this is NOTE
+ s/[^()]//g; # eliminate all non-parens
+ $note_level += s/\(//g - length; # update paren nest level
+ next;
+ }
+
+ # a /* BEGIN CSTYLED */ comment starts a no-check block.
+ if (/\/\* *BEGIN *CSTYLED *\*\//) {
+ $nocheck = 1;
+ }
+
+ # a /*CSTYLED*/ comment indicates that the next line is ok.
+ if (/\/\* *CSTYLED.*\*\//) {
+ /^.*\/\* *CSTYLED *(.*) *\*\/.*$/;
+ $okmsg = $1;
+ $nextok = 1;
+ }
+ if (/\/\/ *CSTYLED/) {
+ /^.*\/\/ *CSTYLED *(.*)$/;
+ $okmsg = $1;
+ $nextok = 1;
+ }
+
+ # universal checks; apply to everything
+ if (/\t +\t/) {
+ err("spaces between tabs");
+ }
+ if (/ \t+ /) {
+ err("tabs between spaces");
+ }
+ if (/\s$/) {
+ err("space or tab at end of line");
+ }
+ if (/[^ \t(]\/\*/ && !/\w\(\/\*.*\*\/\);/) {
+ err("comment preceded by non-blank");
+ }
+
+ # is this the beginning or ending of a function?
+ # (not if "struct foo\n{\n")
+ if (/^{$/ && $prev =~ /\)\s*(const\s*)?(\/\*.*\*\/\s*)?\\?$/) {
+ $in_function = 1;
+ $in_declaration = 1;
+ $in_function_header = 0;
+ $prev = $line;
+ next line;
+ }
+ if (/^}\s*(\/\*.*\*\/\s*)*$/) {
+ if ($prev =~ /^\s*return\s*;/) {
+ err_prev("unneeded return at end of function");
+ }
+ $in_function = 0;
+ reset_indent(); # we don't check between functions
+ $prev = $line;
+ next line;
+ }
+ if (/^\w*\($/) {
+ $in_function_header = 1;
+ }
+
+ if ($in_warlock_comment && /\*\//) {
+ $in_warlock_comment = 0;
+ $prev = $line;
+ next line;
+ }
+
+ # a blank line terminates the declarations within a function.
+ # XXX - but still a problem in sub-blocks.
+ if ($in_declaration && /^$/) {
+ $in_declaration = 0;
+ }
+
+ if ($comment_done) {
+ $in_comment = 0;
+ $in_header_comment = 0;
+ $comment_done = 0;
+ }
+ # does this looks like the start of a block comment?
+ if (/$hdr_comment_start/) {
+ if (!/^\t*\/\*/) {
+ err("block comment not indented by tabs");
+ }
+ $in_comment = 1;
+ /^(\s*)\//;
+ $comment_prefix = $1;
+ if ($comment_prefix eq "") {
+ $in_header_comment = 1;
+ }
+ $prev = $line;
+ next line;
+ }
+ # are we still in the block comment?
+ if ($in_comment) {
+ if (/^$comment_prefix \*\/$/) {
+ $comment_done = 1;
+ } elsif (/\*\//) {
+ $comment_done = 1;
+ err("improper block comment close")
+ unless ($ignore_hdr_comment && $in_header_comment);
+ } elsif (!/^$comment_prefix \*[ \t]/ &&
+ !/^$comment_prefix \*$/) {
+ err("improper block comment")
+ unless ($ignore_hdr_comment && $in_header_comment);
+ }
+ }
+
+ if ($in_header_comment && $ignore_hdr_comment) {
+ $prev = $line;
+ next line;
+ }
+
+ # check for errors that might occur in comments and in code.
+
+ # allow spaces to be used to draw pictures in header comments.
+ if (/[^ ] / && !/".* .*"/ && !$in_header_comment) {
+ err("spaces instead of tabs");
+ }
+ if (/^ / && !/^ \*[ \t\/]/ && !/^ \*$/ &&
+ (!/^ \w/ || $in_function != 0)) {
+ err("indent by spaces instead of tabs");
+ }
+ if (/^\t+ [^ \t\*]/ || /^\t+ \S/ || /^\t+ \S/) {
+ err("continuation line not indented by 4 spaces");
+ }
+ if (/$warlock_re/ && !/\*\//) {
+ $in_warlock_comment = 1;
+ $prev = $line;
+ next line;
+ }
+ if (/^\s*\/\*./ && !/^\s*\/\*.*\*\// && !/$hdr_comment_start/) {
+ err("improper first line of block comment");
+ }
+
+ if ($in_comment) { # still in comment, don't do further checks
+ $prev = $line;
+ next line;
+ }
+
+ if ((/[^(]\/\*\S/ || /^\/\*\S/) &&
+ !(/$lint_re/ || ($splint_comments && /$splint_re/))) {
+ err("missing blank after open comment");
+ }
+ if (/\S\*\/[^)]|\S\*\/$/ &&
+ !(/$lint_re/ || ($splint_comments && /$splint_re/))) {
+ err("missing blank before close comment");
+ }
+ if (/\/\/\S/) { # C++ comments
+ err("missing blank after start comment");
+ }
+ # check for unterminated single line comments, but allow them when
+ # they are used to comment out the argument list of a function
+ # declaration.
+ if (/\S.*\/\*/ && !/\S.*\/\*.*\*\// && !/\(\/\*/) {
+ err("unterminated single line comment");
+ }
+
+ if (/^(#else|#endif|#include)(.*)$/) {
+ $prev = $line;
+ if ($picky) {
+ my $directive = $1;
+ my $clause = $2;
+ # Enforce ANSI rules for #else and #endif: no noncomment
+ # identifiers are allowed after #endif or #else. Allow
+ # C++ comments since they seem to be a fact of life.
+ if ((($1 eq "#endif") || ($1 eq "#else")) &&
+ ($clause ne "") &&
+ (!($clause =~ /^\s+\/\*.*\*\/$/)) &&
+ (!($clause =~ /^\s+\/\/.*$/))) {
+ err("non-comment text following " .
+ "$directive (or malformed $directive " .
+ "directive)");
+ }
+ }
+ next line;
+ }
+
+ #
+ # delete any comments and check everything else. Note that
+ # ".*?" is a non-greedy match, so that we don't get confused by
+ # multiple comments on the same line.
+ #
+ s/\/\*.*?\*\//\ 1/g;
+ s/\/\/.*$/\ 1/; # C++ comments
+
+ # delete any trailing whitespace; we have already checked for that.
+ s/\s*$//;
+
+ # following checks do not apply to text in comments.
+
+ if (/[^<>\s][!<>=]=/ || /[^<>][!<>=]=[^\s,]/ ||
+ (/[^->]>[^,=>\s]/ && !/[^->]>$/) ||
+ (/[^<]<[^,=<\s]/ && !/[^<]<$/) ||
+ /[^<\s]<[^<]/ || /[^->\s]>[^>]/) {
+ err("missing space around relational operator");
+ }
+ if (/\S>>=/ || /\S<<=/ || />>=\S/ || /<<=\S/ || /\S[-+*\/&|^%]=/ ||
+ (/[^-+*\/&|^%!<>=\s]=[^=]/ && !/[^-+*\/&|^%!<>=\s]=$/) ||
+ (/[^!<>=]=[^=\s]/ && !/[^!<>=]=$/)) {
+ # XXX - should only check this for C++ code
+ # XXX - there are probably other forms that should be allowed
+ if (!/\soperator=/) {
+ err("missing space around assignment operator");
+ }
+ }
+ if (/[,;]\S/ && !/\bfor \(;;\)/) {
+ err("comma or semicolon followed by non-blank");
+ }
+ # allow "for" statements to have empty "while" clauses
+ if (/\s[,;]/ && !/^[\t]+;$/ && !/^\s*for \([^;]*; ;[^;]*\)/) {
+ err("comma or semicolon preceded by blank");
+ }
+ if (/^\s*(&&|\|\|)/) {
+ err("improper boolean continuation");
+ }
+ if (/\S *(&&|\|\|)/ || /(&&|\|\|) *\S/) {
+ err("more than one space around boolean operator");
+ }
+ if (/\b(for|if|while|switch|sizeof|return|case)\(/) {
+ err("missing space between keyword and paren");
+ }
+ if (/(\b(for|if|while|switch|return)\b.*){2,}/ && !/^#define/) {
+ # multiple "case" and "sizeof" allowed
+ err("more than one keyword on line");
+ }
+ if (/\b(for|if|while|switch|sizeof|return|case)\s\s+\(/ &&
+ !/^#if\s+\(/) {
+ err("extra space between keyword and paren");
+ }
+ # try to detect "func (x)" but not "if (x)" or
+ # "#define foo (x)" or "int (*func)();"
+ if (/\w\s\(/) {
+ my $s = $_;
+ # strip off all keywords on the line
+ s/\b(for|if|while|switch|return|case|sizeof)\s\(/XXX(/g;
+ s/#elif\s\(/XXX(/g;
+ s/^#define\s+\w+\s+\(/XXX(/;
+ # do not match things like "void (*f)();"
+ # or "typedef void (func_t)();"
+ s/\w\s\(+\*/XXX(*/g;
+ s/\b($typename|void)\s+\(+/XXX(/og;
+ if (/\w\s\(/) {
+ err("extra space between function name and left paren");
+ }
+ $_ = $s;
+ }
+ # try to detect "int foo(x)", but not "extern int foo(x);"
+ # XXX - this still trips over too many legitimate things,
+ # like "int foo(x,\n\ty);"
+# if (/^(\w+(\s|\*)+)+\w+\(/ && !/\)[;,](\s|\ 1)*$/ &&
+# !/^(extern|static)\b/) {
+# err("return type of function not on separate line");
+# }
+ # this is a close approximation
+ if (/^(\w+(\s|\*)+)+\w+\(.*\)(\s|\ 1)*$/ &&
+ !/^(extern|static)\b/) {
+ err("return type of function not on separate line");
+ }
+ if (/^#define /) {
+ err("#define followed by space instead of tab");
+ }
+ if (/^\s*return\W[^;]*;/ && !/^\s*return\s*\(.*\);/) {
+ err("unparenthesized return expression");
+ }
+ if (/\bsizeof\b/ && !/\bsizeof\s*\(.*\)/) {
+ err("unparenthesized sizeof expression");
+ }
+ if (/\(\s/) {
+ err("whitespace after left paren");
+ }
+ # allow "for" statements to have empty "continue" clauses
+ if (/\s\)/ && !/^\s*for \([^;]*;[^;]*; \)/) {
+ err("whitespace before right paren");
+ }
+ if (/^\s*\(void\)[^ ]/) {
+ err("missing space after (void) cast");
+ }
+ if (/\S{/ && !/{{/) {
+ err("missing space before left brace");
+ }
+ if ($in_function && /^\s+{/ &&
+ ($prev =~ /\)\s*$/ || $prev =~ /\bstruct\s+\w+$/)) {
+ err("left brace starting a line");
+ }
+ if (/}(else|while)/) {
+ err("missing space after right brace");
+ }
+ if (/}\s\s+(else|while)/) {
+ err("extra space after right brace");
+ }
+ if (/\b_VOID\b|\bVOID\b|\bSTATIC\b/) {
+ err("obsolete use of VOID or STATIC");
+ }
+ if (/\b$typename\*/o) {
+ err("missing space between type name and *");
+ }
+ if (/^\s+#/) {
+ err("preprocessor statement not in column 1");
+ }
+ if (/^#\s/) {
+ err("blank after preprocessor #");
+ }
+ if (/!\s*(strcmp|strncmp|bcmp)\s*\(/) {
+ err("don't use boolean ! with comparison functions");
+ }
+
+ #
+ # We completely ignore, for purposes of indentation:
+ # * lines outside of functions
+ # * preprocessor lines
+ #
+ if ($check_continuation && $in_function && !$in_cpp) {
+ process_indent($_);
+ }
+ if ($picky) {
+ # try to detect spaces after casts, but allow (e.g.)
+ # "sizeof (int) + 1", "void (*funcptr)(int) = foo;", and
+ # "int foo(int) __NORETURN;"
+ if ((/^\($typename( \*+)?\)\s/o ||
+ /\W\($typename( \*+)?\)\s/o) &&
+ !/sizeof\s*\($typename( \*)?\)\s/o &&
+ !/\($typename( \*+)?\)\s+=[^=]/o) {
+ err("space after cast");
+ }
+ if (/\b$typename\s*\*\s/o &&
+ !/\b$typename\s*\*\s+const\b/o) {
+ err("unary * followed by space");
+ }
+ }
+ if ($check_posix_types) {
+ # try to detect old non-POSIX types.
+ # POSIX requires all non-standard typedefs to end in _t,
+ # but historically these have been used.
+ if (/\b(unchar|ushort|uint|ulong|u_int|u_short|u_long|u_char|quad)\b/) {
+ err("non-POSIX typedef $1 used: use $old2posix{$1} instead");
+ }
+ }
+ if ($heuristic) {
+ # cannot check this everywhere due to "struct {\n...\n} foo;"
+ if ($in_function && !$in_declaration &&
+ /}./ && !/}\s+=/ && !/{.*}[;,]$/ && !/}(\s|\ 1)*$/ &&
+ !/} (else|while)/ && !/}}/) {
+ err("possible bad text following right brace");
+ }
+ # cannot check this because sub-blocks in
+ # the middle of code are ok
+ if ($in_function && /^\s+{/) {
+ err("possible left brace starting a line");
+ }
+ }
+ if (/^\s*else\W/) {
+ if ($prev =~ /^\s*}$/) {
+ err_prefix($prev,
+ "else and right brace should be on same line");
+ }
+ }
+ $prev = $line;
+}
+
+if ($prev eq "") {
+ err("last line in file is blank");
+}
+
+}
+
+#
+# Continuation-line checking
+#
+# The rest of this file contains the code for the continuation checking
+# engine. It's a pretty simple state machine which tracks the expression
+# depth (unmatched '('s and '['s).
+#
+# Keep in mind that the argument to process_indent() has already been heavily
+# processed; all comments have been replaced by control-A, and the contents of
+# strings and character constants have been elided.
+#
+
+my $cont_in; # currently inside of a continuation
+my $cont_off; # skipping an initializer or definition
+my $cont_noerr; # suppress cascading errors
+my $cont_start; # the line being continued
+my $cont_base; # the base indentation
+my $cont_first; # this is the first line of a statement
+my $cont_multiseg; # this continuation has multiple segments
+
+my $cont_special; # this is a C statement (if, for, etc.)
+my $cont_macro; # this is a macro
+my $cont_case; # this is a multi-line case
+
+my @cont_paren; # the stack of unmatched ( and [s we've seen
+
+sub
+reset_indent()
+{
+ $cont_in = 0;
+ $cont_off = 0;
+}
+
+sub
+delabel($)
+{
+ #
+ # replace labels with tabs. Note that there may be multiple
+ # labels on a line.
+ #
+ local $_ = $_[0];
+
+ while (/^(\t*)( *(?:(?:\w+\s*)|(?:case\b[^:]*)): *)(.*)$/) {
+ my ($pre_tabs, $label, $rest) = ($1, $2, $3);
+ $_ = $pre_tabs;
+ while ($label =~ s/^([^\t]*)(\t+)//) {
+ $_ .= "\t" x (length($2) + length($1) / 8);
+ }
+ $_ .= ("\t" x (length($label) / 8)).$rest;
+ }
+
+ return ($_);
+}
+
+sub
+process_indent($)
+{
+ require strict;
+ local $_ = $_[0]; # preserve the global $_
+
+ s/\ 1//g; # No comments
+ s/\s+$//; # Strip trailing whitespace
+
+ return if (/^$/); # skip empty lines
+
+ # regexps used below; keywords taking (), macros, and continued cases
+ my $special = '(?:(?:\}\s*)?else\s+)?(?:if|for|while|switch)\b';
+ my $macro = '[A-Z_][A-Z_0-9]*\(';
+ my $case = 'case\b[^:]*$';
+
+ # skip over enumerations, array definitions, initializers, etc.
+ if ($cont_off <= 0 && !/^\s*$special/ &&
+ (/(?:(?:\b(?:enum|struct|union)\s*[^\{]*)|(?:\s+=\s*)){/ ||
+ (/^\s*{/ && $prev =~ /=\s*(?:\/\*.*\*\/\s*)*$/))) {
+ $cont_in = 0;
+ $cont_off = tr/{/{/ - tr/}/}/;
+ return;
+ }
+ if ($cont_off) {
+ $cont_off += tr/{/{/ - tr/}/}/;
+ return;
+ }
+
+ if (!$cont_in) {
+ $cont_start = $line;
+
+ if (/^\t* /) {
+ err("non-continuation indented 4 spaces");
+ $cont_noerr = 1; # stop reporting
+ }
+ $_ = delabel($_); # replace labels with tabs
+
+ # check if the statement is complete
+ return if (/^\s*\}?$/);
+ return if (/^\s*\}?\s*else\s*\{?$/);
+ return if (/^\s*do\s*\{?$/);
+ return if (/{$/);
+ return if (/}[,;]?$/);
+
+ # Allow macros on their own lines
+ return if (/^\s*[A-Z_][A-Z_0-9]*$/);
+
+ # cases we don't deal with, generally non-kosher
+ if (/{/) {
+ err("stuff after {");
+ return;
+ }
+
+ # Get the base line, and set up the state machine
+ /^(\t*)/;
+ $cont_base = $1;
+ $cont_in = 1;
+ @cont_paren = ();
+ $cont_first = 1;
+ $cont_multiseg = 0;
+
+ # certain things need special processing
+ $cont_special = /^\s*$special/? 1 : 0;
+ $cont_macro = /^\s*$macro/? 1 : 0;
+ $cont_case = /^\s*$case/? 1 : 0;
+ } else {
+ $cont_first = 0;
+
+ # Strings may be pulled back to an earlier (half-)tabstop
+ unless ($cont_noerr || /^$cont_base / ||
+ (/^\t*(?: )?(?:gettext\()?\"/ && !/^$cont_base\t/)) {
+ err_prefix($cont_start,
+ "continuation should be indented 4 spaces");
+ }
+ }
+
+ my $rest = $_; # keeps the remainder of the line
+
+ #
+ # The split matches 0 characters, so that each 'special' character
+ # is processed separately. Parens and brackets are pushed and
+ # popped off the @cont_paren stack. For normal processing, we wait
+ # until a ; or { terminates the statement. "special" processing
+ # (if/for/while/switch) is allowed to stop when the stack empties,
+ # as is macro processing. Case statements are terminated with a :
+ # and an empty paren stack.
+ #
+ foreach $_ (split /[^\(\)\[\]\{\}\;\:]*/) {
+ next if (length($_) == 0);
+
+ # rest contains the remainder of the line
+ my $rxp = "[^\Q$_\E]*\Q$_\E";
+ $rest =~ s/^$rxp//;
+
+ if (/\(/ || /\[/) {
+ push @cont_paren, $_;
+ } elsif (/\)/ || /\]/) {
+ my $cur = $_;
+ tr/\)\]/\(\[/;
+
+ my $old = (pop @cont_paren);
+ if (!defined($old)) {
+ err("unexpected '$cur'");
+ $cont_in = 0;
+ last;
+ } elsif ($old ne $_) {
+ err("'$cur' mismatched with '$old'");
+ $cont_in = 0;
+ last;
+ }
+
+ #
+ # If the stack is now empty, do special processing
+ # for if/for/while/switch and macro statements.
+ #
+ next if (@cont_paren != 0);
+ if ($cont_special) {
+ if ($rest =~ /^\s*{?$/) {
+ $cont_in = 0;
+ last;
+ }
+ if ($rest =~ /^\s*;$/) {
+ err("empty if/for/while body ".
+ "not on its own line");
+ $cont_in = 0;
+ last;
+ }
+ if (!$cont_first && $cont_multiseg == 1) {
+ err_prefix($cont_start,
+ "multiple statements continued ".
+ "over multiple lines");
+ $cont_multiseg = 2;
+ } elsif ($cont_multiseg == 0) {
+ $cont_multiseg = 1;
+ }
+ # We've finished this section, start
+ # processing the next.
+ goto section_ended;
+ }
+ if ($cont_macro) {
+ if ($rest =~ /^$/) {
+ $cont_in = 0;
+ last;
+ }
+ }
+ } elsif (/\;/) {
+ if ($cont_case) {
+ err("unexpected ;");
+ } elsif (!$cont_special) {
+ err("unexpected ;") if (@cont_paren != 0);
+ if (!$cont_first && $cont_multiseg == 1) {
+ err_prefix($cont_start,
+ "multiple statements continued ".
+ "over multiple lines");
+ $cont_multiseg = 2;
+ } elsif ($cont_multiseg == 0) {
+ $cont_multiseg = 1;
+ }
+ if ($rest =~ /^$/) {
+ $cont_in = 0;
+ last;
+ }
+ if ($rest =~ /^\s*special/) {
+ err("if/for/while/switch not started ".
+ "on its own line");
+ }
+ goto section_ended;
+ }
+ } elsif (/\{/) {
+ err("{ while in parens/brackets") if (@cont_paren != 0);
+ err("stuff after {") if ($rest =~ /[^\s}]/);
+ $cont_in = 0;
+ last;
+ } elsif (/\}/) {
+ err("} while in parens/brackets") if (@cont_paren != 0);
+ if (!$cont_special && $rest !~ /^\s*(while|else)\b/) {
+ if ($rest =~ /^$/) {
+ err("unexpected }");
+ } else {
+ err("stuff after }");
+ }
+ $cont_in = 0;
+ last;
+ }
+ } elsif (/\:/ && $cont_case && @cont_paren == 0) {
+ err("stuff after multi-line case") if ($rest !~ /$^/);
+ $cont_in = 0;
+ last;
+ }
+ next;
+section_ended:
+ # End of a statement or if/while/for loop. Reset
+ # cont_special and cont_macro based on the rest of the
+ # line.
+ $cont_special = ($rest =~ /^\s*$special/)? 1 : 0;
+ $cont_macro = ($rest =~ /^\s*$macro/)? 1 : 0;
+ $cont_case = 0;
+ next;
+ }
+ $cont_noerr = 0 if (!$cont_in);
+}
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