[PATCH 04/16] tools lib traceevent: Add trace_seq_reset()

Namhyung Kim
2013-06-04T05:20:44Z

From: Namhyung Kim <namhyung.kim@lge.com>

Sometimes it'd be useful if existing trace_seq can be reused. But
currently it's impossible since there's no API to reset the trace_seq.
Let's add trace_seq_reset() for this case.

Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/lib/traceevent/event-parse.h | 1 +
tools/lib/traceevent/trace-seq.c | 13 +++++++++++++
2 files changed, 14 insertions(+)

diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
index bfceab948f22..39f0c1dca915 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -69,6 +69,7 @@ struct trace_seq {
};

void trace_seq_init(struct trace_seq *s);
+void trace_seq_reset(struct trace_seq *s);
void trace_seq_destroy(struct trace_seq *s);

extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
diff --git a/tools/lib/traceevent/trace-seq.c b/tools/lib/traceevent/trace-seq.c
index a57db805136a..d7f2e68bc5b9 100644
--- a/tools/lib/traceevent/trace-seq.c
+++ b/tools/lib/traceevent/trace-seq.c
@@ -49,6 +49,19 @@ void trace_seq_init(struct trace_seq *s)
}

/**
+ * trace_seq_reset - re-initialize the trace_seq structure
+ * @s: a pointer to the trace_seq structure to reset
+ */
+void trace_seq_reset(struct trace_seq *s)
+{
+ if (!s)
+ return;
+ TRACE_SEQ_CHECK(s);
+ s->len = 0;
+ s->readpos = 0;
+}
+
+/**
* trace_seq_destroy - free up memory of a trace_seq
* @s: a pointer to the trace_seq to free the buffer
*
--
1.7.11.7