linux-kernel - [PATCH v3 14/21] dyndbg: accept query terms like module:foo and file=bar

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Message-Id: <20200617162536.611386-17-jim.cromie@gmail.com>
Date:   Wed, 17 Jun 2020 10:25:29 -0600
From:   Jim Cromie <jim.cromie@...il.com>
To:     jbaron@...mai.com, linux-kernel@...r.kernel.org,
        akpm@...uxfoundation.org, gregkh@...uxfoundation.org
Cc:     linux@...musvillemoes.dk, Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH v3 14/21] dyndbg: accept query terms like module:foo and file=bar

Current code expects "keyword" "arg" as 2 space separated words.
Change to also accept "keyword=arg" form as well, and drop !(nwords%2)
requirement.

Then in rest of function, use new keyword,arg variables instead of
word[i],word[i+1]

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 lib/dynamic_debug.c | 51 ++++++++++++++++++++++++++++-----------------
 1 file changed, 32 insertions(+), 19 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 7eb963b1bd11..e1dd96178f18 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -351,6 +351,8 @@ static int check_set(const char **dest, char *src, char *name)
  * line <lineno>
  * line <first-lineno>-<last-lineno> // where either may be empty
  *
+ * Also accept combined keyword=value and keyword:value forms
+ *
  * Only 1 of each type is allowed.
  * Returns 0 on success, <0 on error.
  */
@@ -360,22 +362,33 @@ static int ddebug_parse_query(char *words[], int nwords,
 	unsigned int i;
 	int rc = 0;
 	char *fline;
-
-	/* check we have an even number of words */
-	if (nwords % 2 != 0) {
-		pr_err("expecting pairs of match-spec <value>\n");
-		return -EINVAL;
-	}
+	char *keyword, *arg;
 
 	if (modname)
 		/* support $modname.dyndbg=<multiple queries> */
 		query->module = modname;
 
-	for (i = 0; i < nwords; i += 2) {
-		if (!strcmp(words[i], "func")) {
-			rc = check_set(&query->function, words[i+1], "func");
-		} else if (!strcmp(words[i], "file")) {
-			if (check_set(&query->filename, words[i+1], "file"))
+	for (i = 0; i < nwords; i++) {
+		/* accept keyword=arg */
+		vpr_info("%d w:%s\n", i, words[i]);
+
+		keyword = words[i];
+		if ((arg = strchr(keyword, '='))) {
+			*arg++ = '\0';
+		} else {
+			i++; /* next word is arg */
+			if (!(i < nwords)) {
+				pr_err("missing arg to keyword:%s\n", keyword);
+				return -EINVAL;
+			}
+			arg = words[i];
+		}
+		vpr_info("%d key:%s arg:%s\n", i, keyword, arg);
+
+		if (!strcmp(keyword, "func")) {
+			rc = check_set(&query->function, arg, "func");
+		} else if (!strcmp(keyword, "file")) {
+			if (check_set(&query->filename, arg, "file"))
 				return -EINVAL;
 
 			/* tail :$info is function or line-range */
@@ -391,18 +404,18 @@ static int ddebug_parse_query(char *words[], int nwords,
 				if (parse_linerange(query, fline))
 					return -EINVAL;
 			}
-		} else if (!strcmp(words[i], "module")) {
-			rc = check_set(&query->module, words[i+1], "module");
-		} else if (!strcmp(words[i], "format")) {
-			string_unescape_inplace(words[i+1], UNESCAPE_SPACE |
+		} else if (!strcmp(keyword, "module")) {
+			rc = check_set(&query->module, arg, "module");
+		} else if (!strcmp(keyword, "format")) {
+			string_unescape_inplace(arg, UNESCAPE_SPACE |
 							    UNESCAPE_OCTAL |
 							    UNESCAPE_SPECIAL);
-			rc = check_set(&query->format, words[i+1], "format");
-		} else if (!strcmp(words[i], "line")) {
-			if (parse_linerange(query, words[i+1]))
+			rc = check_set(&query->format, arg, "format");
+		} else if (!strcmp(keyword, "line")) {
+			if (parse_linerange(query, arg))
 				return -EINVAL;
 		} else {
-			pr_err("unknown keyword \"%s\"\n", words[i]);
+			pr_err("unknown keyword \"%s\"\n", keyword);
 			return -EINVAL;
 		}
 		if (rc)
-- 
2.26.2