perf data ctf: Add value_set_string() helper

There are many value_set_##x helper for integer, but only for integer.
This patch adds value_set_string() helper to help following commits
create string fields.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1466767332-114472-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/tools/perf/util/data-convert-bt.c b/tools/perf/util/data-convert-bt.c
index 7b1bc24c382e..4b68e7b9ee0c 100644
--- a/tools/perf/util/data-convert-bt.c
+++ b/tools/perf/util/data-convert-bt.c
@@ -141,6 +141,36 @@ FUNC_VALUE_SET(s64)
 FUNC_VALUE_SET(u64)
 __FUNC_VALUE_SET(u64_hex, u64)
 
+static int string_set_value(struct bt_ctf_field *field, const char *string);
+static __maybe_unused int
+value_set_string(struct ctf_writer *cw, struct bt_ctf_event *event,
+                 const char *name, const char *string)
+{
+        struct bt_ctf_field_type *type = cw->data.string;
+        struct bt_ctf_field *field;
+        int ret = 0;
+
+        field = bt_ctf_field_create(type);
+        if (!field) {
+                pr_err("failed to create a field %s\n", name);
+                return -1;
+        }
+
+        ret = string_set_value(field, string);
+        if (ret) {
+                pr_err("failed to set value %s\n", name);
+                goto err_put_field;
+        }
+
+        ret = bt_ctf_event_set_payload(event, name, field);
+        if (ret)
+                pr_err("failed to set payload %s\n", name);
+
+err_put_field:
+        bt_ctf_field_put(field);
+        return ret;
+}
+
 static struct bt_ctf_field_type*
 get_tracepoint_field_type(struct ctf_writer *cw, struct format_field *field)
 {