linux-kernel - Re: [PATCH] Staging: quatech_usb2: fix coding style issues

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Date:	Tue, 30 Mar 2010 13:58:39 -0700
From:	Joe Perches <joe@...ches.com>
To:	Soeren Moeller <soerenmoeller2001@...il.com>
Cc:	gregkh@...e.de, richard@...acityteam.org, andre.goddard@...il.com,
	nm127@...email.hu, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Staging: quatech_usb2: fix coding style issues

On Tue, 2010-03-30 at 20:11 +0000, Soeren Moeller wrote:
> This is a patch to the file quatech_usb2.c that fixes two space before tabular and one line of more than 80 characters warnings found by checkpatch.pl
> -				tty_insert_flip_string(tty_st,
> -					&((unsigned char *)(urb->transfer_buffer)
> -						)[i],
> -					1);
> +				tty_insert_flip_string(tty_st, &(
> +						(unsigned char *)
> +						(urb->transfer_buffer)
> +					)[i], 1);

I think this is unsightly.
Perhaps a macro instead?

Signed-off-by: Joe Perches <joe@...ches.com>
---
 drivers/staging/quatech_usb2/quatech_usb2.c |   17 +++++++++--------
 1 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/quatech_usb2/quatech_usb2.c b/drivers/staging/quatech_usb2/quatech_usb2.c
index 1561f74..d14792a 100644
--- a/drivers/staging/quatech_usb2/quatech_usb2.c
+++ b/drivers/staging/quatech_usb2/quatech_usb2.c
@@ -109,12 +109,15 @@ static int debug;
 #define  QT2_LINE_STATUS_REGISTER       0x05
 #define  QT2_MODEM_STATUS_REGISTER      0x06
 
+/* handy macro for extracting a byte from a data read transfer buffer */
+#define URB_TBUF(urb, pos) (((unsigned char *)(urb->transfer_buffer))[pos])
+
 /* handy macros for doing escape sequence parsing on data reads */
-#define THISCHAR	((unsigned char *)(urb->transfer_buffer))[i]
-#define NEXTCHAR	((unsigned char *)(urb->transfer_buffer))[i + 1]
-#define THIRDCHAR	((unsigned char *)(urb->transfer_buffer))[i + 2]
-#define FOURTHCHAR	((unsigned char *)(urb->transfer_buffer))[i + 3]
-#define FIFTHCHAR	((unsigned char *)(urb->transfer_buffer))[i + 4]
+#define THISCHAR	URB_TBUF(urb, i + 0)
+#define NEXTCHAR	URB_TBUF(urb, i + 1)
+#define THIRDCHAR	URB_TBUF(urb, i + 2)
+#define FOURTHCHAR	URB_TBUF(urb, i + 3)
+#define FIFTHCHAR	URB_TBUF(urb, i + 4)
 
 static const struct usb_device_id quausb2_id_table[] = {
 	{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
@@ -1649,9 +1652,7 @@ __func__);
 			if (tty_st && urb->actual_length) {
 				tty_buffer_request_room(tty_st, 1);
 				tty_insert_flip_string(tty_st,
-					&((unsigned char *)(urb->transfer_buffer)
-						)[i],
-					1);
+						       &URB_TBUF(urb, i), 1);
 			}
 		} /*endfor*/
 		tty_flip_buffer_push(tty_st);


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