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 064/101] fbdev/pvr2fb: Parse option string with struct option_iter
Date:   Thu,  9 Mar 2023 17:01:24 +0100
Message-Id: <20230309160201.5163-65-tzimmermann@suse.de>
In-Reply-To: <20230309160201.5163-1-tzimmermann@suse.de>
References: <20230309160201.5163-1-tzimmermann@suse.de>
MIME-Version: 1.0
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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/pvr2fb.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/video/fbdev/pvr2fb.c b/drivers/video/fbdev/pvr2fb.c
index f6be2649840d..c332f2c38114 100644
--- a/drivers/video/fbdev/pvr2fb.c
+++ b/drivers/video/fbdev/pvr2fb.c
@@ -46,6 +46,7 @@
 #undef DEBUG
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -1025,20 +1026,18 @@ static void pvr2fb_pci_exit(void)
  */
 
 #ifndef MODULE
-static int __init pvr2fb_setup(char *options)
+static int __init pvr2fb_setup(const char *options)
 {
-	char *this_opt;
 	char cable_arg[80];
 	char output_arg[80];
-
-	if (!options || !*options)
-		return 0;
+	struct option_iter iter;
+	char *this_opt;
 
 	cable_arg[0] = output_arg[0] = 0;
 
-	while ((this_opt = strsep(&options, ","))) {
-		if (!*this_opt)
-			continue;
+	option_iter_init(&iter, options);
+
+	while (option_iter_next(&iter, &this_opt)) {
 		if (!strcmp(this_opt, "inverse")) {
 			fb_invert_cmaps();
 		} else if (!strncmp(this_opt, "cable:", 6)) {
@@ -1056,6 +1055,8 @@ static int __init pvr2fb_setup(char *options)
 		}
 	}
 
+	option_iter_release(&iter);
+
 	if (*cable_arg)
 		cable_type = pvr2_get_param_val(cables, cable_arg, 3);
 	if (*output_arg)
-- 
2.39.2