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 077/101] fbdev/sstfb: Parse option string with struct option_iter
Date:   Thu,  9 Mar 2023 17:01:37 +0100
Message-Id: <20230309160201.5163-78-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/sstfb.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/video/fbdev/sstfb.c b/drivers/video/fbdev/sstfb.c
index f422b1882950..b509020fed74 100644
--- a/drivers/video/fbdev/sstfb.c
+++ b/drivers/video/fbdev/sstfb.c
@@ -81,6 +81,7 @@
  */
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/string.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -1274,16 +1275,14 @@ static void sst_shutdown(struct fb_info *info)
 /*
  * Interface to the world
  */
-static int sstfb_setup(char *options)
+static int sstfb_setup(const char *options)
 {
+	struct option_iter iter;
 	char *this_opt;
 
-	if (!options || !*options)
-		return 0;
-
-	while ((this_opt = strsep(&options, ",")) != NULL) {
-		if (!*this_opt) continue;
+	option_iter_init(&iter, options);
 
+	while (option_iter_next(&iter, &this_opt)) {
 		f_ddprintk("option %s\n", this_opt);
 
 		if (!strcmp(this_opt, "vganopass"))
@@ -1308,6 +1307,9 @@ static int sstfb_setup(char *options)
 			mode_option = mode_option_buf;
 		}
 	}
+
+	option_iter_release(&iter);
+
 	return 0;
 }
 
-- 
2.39.2