From:   Thomas Zimmermann <tzimmermann@suse.de>
To:     deller@gmx.de, geert+renesas@glider.be, timur@kernel.org,
        rdunlap@infradead.org, paulus@samba.org, benh@kernel.crashing.org,
        linux@armlinux.org.uk, pjones@redhat.com, adaplas@gmail.com,
        s.hauer@pengutronix.de, shawnguo@kernel.org, mbroemme@libmpq.org,
        thomas@winischhofer.net, James.Bottomley@HansenPartnership.com,
        sudipm.mukherjee@gmail.com, teddy.wang@siliconmotion.com,
        corbet@lwn.net
Cc:     linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org,
        Thomas Zimmermann <tzimmermann@suse.de>
Subject: [PATCH v2 005/101] fbdev/acornfb: Parse option string with struct option_iter
Date:   Thu,  9 Mar 2023 17:00:25 +0100
Message-Id: <20230309160201.5163-6-tzimmermann@suse.de>
In-Reply-To: <20230309160201.5163-1-tzimmermann@suse.de>
References: <20230309160201.5163-1-tzimmermann@suse.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Use struct option_iter to walk over the individual options in the
driver's option string. Replaces the hand-written strsep() loop with
a clean interface. The helpers for struct option_iter handle empty
option strings and empty options transparently. The struct's _init
and _release functions duplicate and release the option string's
memory buffer as needed.

Done in preparation of constifying the option string.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/video/fbdev/acornfb.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/video/fbdev/acornfb.c b/drivers/video/fbdev/acornfb.c
index 8642136a6bdc..3fed89e03554 100644
--- a/drivers/video/fbdev/acornfb.c
+++ b/drivers/video/fbdev/acornfb.c
@@ -14,6 +14,7 @@
  *  - Blanking 8bpp displays with VIDC
  */
 
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -879,17 +880,15 @@ static struct options {
 	{ NULL, NULL }
 };
 
-static int acornfb_setup(char *options)
+static int acornfb_setup(const char *options)
 {
-	struct options *optp;
+	struct option_iter iter;
 	char *opt;
 
-	if (!options || !*options)
-		return 0;
+	option_iter_init(&iter, options);
 
-	while ((opt = strsep(&options, ",")) != NULL) {
-		if (!*opt)
-			continue;
+	while (option_iter_next(&iter, &opt)) {
+		struct options *optp;
 
 		for (optp = opt_table; optp->name; optp++) {
 			int optlen;
@@ -907,6 +906,9 @@ static int acornfb_setup(char *options)
 			printk(KERN_ERR "acornfb: unknown parameter: %s\n",
 			       opt);
 	}
+
+	option_iter_release(&iter);
+
 	return 0;
 }
 
-- 
2.39.2