[PATCH] checkpatch: Add some --strict coding style checks

[Joe Perches <joe@perches.com>]

Argument alignment across multiple lines should
match the open parenthesis.

Logical continuations should be at the end of
the previous line, not the start of a new line.

These are not required by CodingStyle so make the
tests active only when using --strict.

Tested with:
int foo(void)
{
	if (foo &&
	    bar())
		baz();

	if (foo &&
	     bar())
		baz();

	foo_some_long_function(bar,
			       baz);

	foo_some_long_function(bar,
		baz);

	return 0;
}

Signed-off-by: Joe Perches <joe@perches.com>
---
 scripts/checkpatch.pl |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index a3b9782..629944e 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1783,6 +1783,28 @@ sub process {
 			     "please, no space before tabs\n" . $herevet);
 		}
 
+# check for && or || at the start of a line
+		if ($rawline =~ /^\+\s*(&&|\|\|)/) {
+			CHK("LOGICAL_CONTINUATIONS",
+			    "Logical continuations should be on the previous line\n" . $hereprev);
+		}
+
+# check multi-line statement indentation matches previous line
+		if ($prevline =~ /^\+(\t*)(if \(|$Ident\().*(\&\&|\|\||,)\s*$/ && $rawline =~ /^\+([ \t]*)/) {
+			$prevline =~ /^\+(\t*)(if \(|$Ident\().*(\&\&|\|\||,)\s*$/;
+			my $oldindent = $1;
+			my $if_or_func = $2;
+			$rawline =~ /^\+([ \t]*)/;
+			my $newindent = $1;
+			my $goodindent = $oldindent .
+					 "\t" x (length($if_or_func) / 8) .
+					 " "  x (length($if_or_func) % 8);
+			if ($newindent ne "$goodindent") {
+				CHK("PARENTHESIS_ALIGNMENT",
+				    "Alignment should match open parenthesis\n" . $hereprev);
+			}
+		}
+
 # check for spaces at the beginning of a line.
 # Exceptions:
 #  1) within comments