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

Jim Cromie
2020-06-17T16:26:28Z

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@gmail.com>
---
.../admin-guide/dynamic-debug-howto.rst | 1 +
lib/dynamic_debug.c | 51 ++++++++++++-------
2 files changed, 33 insertions(+), 19 deletions(-)

diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst
index 6c04aea8f4cd..e5a8def45f3f 100644
--- a/Documentation/admin-guide/dynamic-debug-howto.rst
+++ b/Documentation/admin-guide/dynamic-debug-howto.rst
@@ -156,6 +156,7 @@ against. Possible keywords are:::
``line-range`` cannot contain space, e.g.
"1-30" is valid range but "1 - 30" is not.

+ ``module=foo`` combined keyword=value form is interchangably accepted

The meanings of each keyword are:

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