[PATCH] checkpatch.pl: allow piping

[Daniel Walker <dwalker@mvista.com>]

A little feature addition to allow checkpatch.pl to check patches piped
into it, in addition to specific file arguments.

Signed-off-by: Daniel Walker <dwalker@mvista.com>
---
 scripts/checkpatch.pl |   15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

Index: linux-2.6.23/scripts/checkpatch.pl
===================================================================
--- linux-2.6.23.orig/scripts/checkpatch.pl
+++ linux-2.6.23/scripts/checkpatch.pl
@@ -24,6 +24,7 @@ my $file = 0;
 my $check = 0;
 my $summary = 1;
 my $mailback = 0;
+my $piped = (-t STDIN) ? 0 : 1;
 my $root;
 GetOptions(
 	'q|quiet+'	=> \$quiet,
@@ -43,7 +44,7 @@ GetOptions(
 
 my $exit = 0;
 
-if ($#ARGV < 0) {
+if ($#ARGV < 0 && !$piped) {
 	print "usage: $P [options] patchfile\n";
 	print "version: $V\n";
 	print "options: -q           => quiet\n";
@@ -181,6 +182,18 @@ if ($tree && -f "$root/$removal") {
 }
 
 my @rawlines = ();
+
+if ($piped) {
+	while (<STDIN>) {
+		chomp;
+		push(@rawlines, $_);
+	}
+	if (!process("", @rawlines)) {
+		$exit = 1;
+	}
+	@rawlines = ();
+}
+
 for my $filename (@ARGV) {
 	if ($file) {
 		open(FILE, "diff -u /dev/null $filename|") ||
-- 

--