linux-kernel - [PATCH 92/99] fbdev/vesafb: Parse option string with struct option

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Date:   Mon,  6 Mar 2023 17:00:09 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     deller@....de, paulus@...ba.org, benh@...nel.crashing.org,
        linux@...linux.org.uk, pjones@...hat.com, timur@...nel.org,
        adaplas@...il.com, s.hauer@...gutronix.de, shawnguo@...nel.org,
        mbroemme@...mpq.org, thomas@...ischhofer.net,
        James.Bottomley@...senPartnership.com, spock@...too.org,
        sudipm.mukherjee@...il.com, teddy.wang@...iconmotion.com,
        geert+renesas@...der.be, corbet@....net
Cc:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>
Subject: [PATCH 92/99] fbdev/vesafb: Parse option string with struct option_iter

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@...e.de>
---
 drivers/video/fbdev/vesafb.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/video/fbdev/vesafb.c b/drivers/video/fbdev/vesafb.c
index 3f8bdfcf51f0..0310a3db2b10 100644
--- a/drivers/video/fbdev/vesafb.c
+++ b/drivers/video/fbdev/vesafb.c
@@ -10,6 +10,7 @@
  */
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -209,16 +210,14 @@ static struct fb_ops vesafb_ops = {
 	.fb_imageblit	= cfb_imageblit,
 };
 
-static int vesafb_setup(char *options)
+static int vesafb_setup(const char *options)
 {
-	char *this_opt;
+	struct option_iter iter;
+	const 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)) {
 		if (! strcmp(this_opt, "inverse"))
 			inverse=1;
 		else if (! strcmp(this_opt, "redraw"))
@@ -240,6 +239,9 @@ static int vesafb_setup(char *options)
 		else if (! strncmp(this_opt, "vremap:", 7))
 			vram_remap = simple_strtoul(this_opt+7, NULL, 0);
 	}
+
+	option_iter_release(&iter);
+
 	return 0;
 }
 
-- 
2.39.2