linux-kernel - [re: PATCH v2 00/15 - 06/11] dyndbg: treat comma as a token separator

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Message-ID: <daa8332f3adc2406cc61bf781eb590a7873bbcaf.1701993656.git.jim.cromie@gmail.com>
Date:   Thu,  7 Dec 2023 17:15:09 -0700
From:   Jim Cromie <jim.cromie@...il.com>
To:     lb@...ihalf.com, linux-kernel@...r.kernel.org
Cc:     akpm@...ux-foundation.org, bleung@...gle.com, contact@...rsion.fr,
        daniel@...ll.ch, dianders@...omium.org, groeck@...gle.com,
        jbaron@...mai.com, jim.cromie@...il.com, john.ogness@...utronix.de,
        keescook@...omium.org, pmladek@...e.com, ppaalanen@...il.com,
        rostedt@...dmis.org, seanpaul@...omium.org,
        sergey.senozhatsky@...il.com, upstream@...ihalf.com,
        vincent.whitchurch@...s.com, yanivt@...gle.com,
        gregkh@...uxfoundation.org
Subject: [re: PATCH v2 00/15 -  06/11] dyndbg: treat comma as a token separator

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 a5fc80edd24c..a380b8151dd8 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -647,6 +647,10 @@ 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 == '\'') {
@@ -658,7 +662,7 @@ 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