[PATCH] checkpatch.pl: Check for function declarations without arguments

[Joe Perches <joe@perches.com>]

Functions like this one are evil:

void foo()
{
	...
}

Because these functions allow variadic arguments without
checking the arguments at all.
 
Original-patch-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Joe Perches <joe@perches.com>
---
 scripts/checkpatch.pl | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 61090e0..2e1ff0c 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2634,6 +2634,15 @@ sub process {
 				$herecurr);
                }
 
+# check for function declarations without arguments like "int foo()"
+		if ($line =~ /(\b$Type\s+$Ident)\s*\(\s*\)/) {
+			if (ERROR("FUNCTION_WITHOUT_ARGS",
+				  "Bad function definition - $1() should probably be $1(void)\n" . $herecurr) &&
+			    $fix) {
+				$fixed[$linenr - 1] =~ s/(\b($Type)\s+($Ident))\s*\(\s*\)/$2 $3(void)/;
+			}
+		}
+
 # check for declarations of struct pci_device_id
 		if ($line =~ /\bstruct\s+pci_device_id\s+\w+\s*\[\s*\]\s*\=\s*\{/) {
 			WARN("DEFINE_PCI_DEVICE_TABLE",