[PATCH 7/7] trace-cmd, kernelshark, libtraceevent: Changed tep_plugin_add_option() API

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>]

The API
 tep_plugin_add_option()
is renamed to
 tep_plugin_set_option()

The new name describes more closely the purpose of the API -
it lets us update the option's value. The logic of the API is
slightly changed: If no plugin is given, all options that match
the option name will be updated.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 include/traceevent/event-parse.h |  2 +-
 kernel-shark/src/libkshark.c     |  4 ++--
 lib/traceevent/event-plugin.c    | 30 +++++++++++++++++++++++-------
 tracecmd/trace-read.c            |  2 +-
 4 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/include/traceevent/event-parse.h b/include/traceevent/event-parse.h
index a64482d..538dd94 100644
--- a/include/traceevent/event-parse.h
+++ b/include/traceevent/event-parse.h
@@ -368,7 +368,7 @@ void tep_walk_plugins(const struct tep_plugin_list *list,
 
 int tep_plugin_add_options(const char *name,
 			   struct tep_plugin_option *options);
-int tep_plugin_add_option(const char *name, const char *val);
+int tep_plugin_set_option(const char *name, const char *val);
 void tep_plugin_remove_options(struct tep_plugin_option *options);
 void tep_plugin_walk_options(int (*callback)(struct tep_plugin_option *op,
 					     void *context),
diff --git a/kernel-shark/src/libkshark.c b/kernel-shark/src/libkshark.c
index a361578..34fa007 100644
--- a/kernel-shark/src/libkshark.c
+++ b/kernel-shark/src/libkshark.c
@@ -160,8 +160,8 @@ bool kshark_open(struct kshark_context *kshark_ctx, const char *file)
 	 * Turn off function trace indent and turn on show parent
 	 * if possible.
 	 */
-	tep_plugin_add_option("ftrace:parent", "1");
-	tep_plugin_add_option("ftrace:indent", "0");
+	tep_plugin_set_option("ftrace:parent", "1");
+	tep_plugin_set_option("ftrace:indent", "0");
 
 	return true;
 }
diff --git a/lib/traceevent/event-plugin.c b/lib/traceevent/event-plugin.c
index 1ea02e6..4af85de 100644
--- a/lib/traceevent/event-plugin.c
+++ b/lib/traceevent/event-plugin.c
@@ -219,7 +219,10 @@ static void parse_option_name(char **option, char **plugin)
 	*plugin = NULL;
 
 	if ((p = strstr(*option, ":"))) {
-		*plugin = *option;
+		if (**option == ':')
+			*plugin = NULL;
+		else
+			*plugin = *option;
 		*p = '\0';
 		*option = strdup(p + 1);
 		if (!*option)
@@ -229,25 +232,38 @@ static void parse_option_name(char **option, char **plugin)
 
 static int process_option(const char *plugin, const char *option, const char *val)
 {
+	struct registered_plugin_options *reg;
 	struct tep_plugin_option *op;
+	int ret;
 
-	op = find_registered_option(plugin, option);
-	if (!op)
-		return 0;
+	for (reg = registered_options; reg; reg = reg->next) {
+		for (op = reg->options; op->name; op++) {
+			if (plugin && strcmp(plugin, op->plugin) != 0)
+				continue;
+			if (strcmp(option, op->name) != 0)
+				continue;
 
-	return update_option_value(op, val);
+			ret = update_option_value(op, val);
+			if (ret)
+				return ret;
+		}
+	}
+
+	return 0;
 }
 
 /**
- * tep_plugin_add_option - add an option/val pair to set plugin options
+ * tep_plugin_set_option - update the value of plugin option
  * @name: The name of the option (format: <plugin>:<option> or just <option>)
  * @val: (optiona) the value for the option
  *
  * Modify a plugin option. If @val is given than the value of the option
  * is set (note, some options just take a boolean, so @val must be either
  * "1" or "0" or "true" or "false").
+ * If there is no <plugin> in the @name, all options with name <option> will
+ * be updated.
  */
-int tep_plugin_add_option(const char *name, const char *val)
+int tep_plugin_set_option(const char *name, const char *val)
 {
 	struct trace_plugin_options *op;
 	char *option_str;
diff --git a/tracecmd/trace-read.c b/tracecmd/trace-read.c
index c0d640d..7b41d72 100644
--- a/tracecmd/trace-read.c
+++ b/tracecmd/trace-read.c
@@ -1381,7 +1381,7 @@ static void process_plugin_option(char *option)
 		*p = '\0';
 		val = p+1;
 	}
-	tep_plugin_add_option(name, val);
+	tep_plugin_set_option(name, val);
 }
 
 static void set_event_flags(struct tep_handle *pevent, struct event_str *list,
-- 
2.24.1