linux-kernel - [PATCH v3 18/22] dyndbg: treat comma as a token separator

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Date: Sat, 23 Dec 2023 02:51:27 +0100
From: Łukasz Bartosik <lb@...ihalf.com>
To: Jason Baron <jbaron@...mai.com>,
	Jim Cromie <jim.cromie@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Douglas Anderson <dianders@...omium.org>
Cc: Guenter Roeck <groeck@...gle.com>,
	Yaniv Tzoreff <yanivt@...gle.com>,
	Benson Leung <bleung@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Vincent Whitchurch <vincent.whitchurch@...s.com>,
	Pekka Paalanen <ppaalanen@...il.com>,
	Sean Paul <seanpaul@...omium.org>,
	Daniel Vetter <daniel@...ll.ch>,
	Simon Ser <contact@...rsion.fr>,
	John Ogness <john.ogness@...utronix.de>,
	Petr Mladek <pmladek@...e.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	linux-kernel@...r.kernel.org,
	upstream@...ihalf.com
Subject: [PATCH v3 18/22] dyndbg: treat comma as a token separator

From: Jim Cromie <jim.cromie@...il.com>

Treat comma as a token terminator, just like a space.  This allows a
user to avoid quoting hassles when spaces are otherwise needed:

 :#> modprobe drm dyndbg=class,DRM_UT_CORE,+p\;class,DRM_UT_KMS,+p

or as a boot arg:

  drm.dyndbg=class,DRM_UT_CORE,+p  # todo: support multi-query here

Given the myriad ways a boot-line can be assembled and then passed
in/down/around shell based tools, if the >control parser treats commas
like spacees, this would allow side-stepping all sorts of quoting
hassles thru those layers.

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 lib/dynamic_debug.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index d4e50e4f6635..70d9440193a8 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -637,6 +637,10 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
 			break;	/* oh, it was trailing whitespace */
 		if (*buf == '#')
 			break;	/* token starts comment, skip rest of line */
+		if (*buf == ',') {
+			buf++;
+			continue;
+		}
 
 		/* find `end' of word, whitespace separated or quoted */
 		if (*buf == '"' || *buf == '\'') {
@@ -648,7 +652,7 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
 				return -EINVAL;	/* unclosed quote */
 			}
 		} else {
-			for (end = buf; *end && !isspace(*end); end++)
+			for (end = buf; *end && !isspace(*end) && *end != ','; end++)
 				;
 			if (end == buf) {
 				pr_err("parse err after word:%d=%s\n", nwords,
-- 
2.43.0.472.g3155946c3a-goog