From d8c2b2f781d9cab547e9a262e6b9290fc41622b2 Mon Sep 17 00:00:00 2001
From: Steffen Vogel <post@steffenvogel.de>
Date: Tue, 6 Jul 2021 18:30:46 +0200
Subject: [PATCH] signal: add signal_print() function

---
 include/villas/signal.h |  2 ++
 lib/signal.cpp          | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/include/villas/signal.h b/include/villas/signal.h
index e3f6e3ba5..405ecc94f 100644
--- a/include/villas/signal.h
+++ b/include/villas/signal.h
@@ -78,6 +78,8 @@ struct signal * signal_copy(struct signal *s);
 /** Parse signal description. */
 int signal_parse(struct signal *s, json_t *json);
 
+char * signal_print(const struct signal *s, const union signal_data *d = nullptr);
+
 /** Initialize signal from a mapping_entry. */
 int signal_init_from_mapping(struct signal *s, const struct mapping_entry *me, unsigned index);
 
diff --git a/lib/signal.cpp b/lib/signal.cpp
index 7c151ca9a..69291da5f 100644
--- a/lib/signal.cpp
+++ b/lib/signal.cpp
@@ -245,3 +245,26 @@ json_t * signal_to_json(struct signal *s)
 
 	return json_sig;
 }
+
+char * signal_print(const struct signal *s, const union signal_data *d)
+{
+	char *buf = nullptr;
+
+	if (s->name)
+		strcatf(&buf, " %s", s->name);
+
+	if (s->unit)
+		strcatf(&buf, " [%s]", s->unit);
+
+	strcatf(&buf, "(%s)", signal_type_to_str(s->type));
+
+	if (d) {
+		char val[32];
+
+		signal_data_print_str(d, s->type, val, sizeof(val));
+
+		strcatf(&buf, " = %s", val);
+	}
+
+	return buf;
+}