linux-kernel - [PATCH v3 19/22] dyndbg: add skip_spaces_and

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Message-ID: <20231223015131.2836090-20-lb@semihalf.com>
Date: Sat, 23 Dec 2023 02:51:28 +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 19/22] dyndbg: add skip_spaces_and_coma()

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

The function skip_spaces_and_coma removes leading
spaces and coma. With this approach a user can
provide dynamic debug control commands in new format.
For example the following command (existing format)

modprobe test_dynamic_debug dyndbg="class D2_CORE +p"

can also be provided as (new format):

modprobe test_dynamic_debug dyndbg=class,D2_CORE,+p

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
Signed-off-by: Łukasz Bartosik <lb@...ihalf.com>
---
 lib/dynamic_debug.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 70d9440193a8..48ce24c39457 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -618,6 +618,14 @@ static int ddebug_change(const struct ddebug_query *query,
 	return nfound;
 }
 
+char *skip_spaces_and_coma(const char *str)
+{
+	str = skip_spaces(str);
+	if (*str == ',')
+		str = skip_spaces(++str);
+	return (char *)str;
+}
+
 /*
  * Split the buffer `buf' into space-separated words.
  * Handles simple " and ' quoting, i.e. without nested,
@@ -631,8 +639,8 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
 	while (*buf) {
 		char *end;
 
-		/* Skip leading whitespace */
-		buf = skip_spaces(buf);
+		/* Skip leading whitespace and coma */
+		buf = skip_spaces_and_coma(buf);
 		if (!*buf)
 			break;	/* oh, it was trailing whitespace */
 		if (*buf == '#')
@@ -959,7 +967,7 @@ static int ddebug_exec_queries(char *query, const char *modname)
 		if (split)
 			*split++ = '\0';
 
-		query = skip_spaces(query);
+		query = skip_spaces_and_coma(query);
 		if (!query || !*query || *query == '#')
 			continue;
 
-- 
2.43.0.472.g3155946c3a-goog