tag: added tag_is_defined()

tag_is_defined() checks whether there is any information in the tag
object.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/tag.h b/src/tag.h
index 2347801e..0c525b24 100644
--- a/src/tag.h
+++ b/src/tag.h
@@ -110,6 +110,15 @@ tag_is_empty(const struct tag *tag)
 }
 
 /**
+ * Returns true if the tag contains any information.
+ */
+static inline bool
+tag_is_defined(const struct tag *tag)
+{
+	return !tag_is_empty(tag) || tag->time >= 0;
+}
+
+/**
  * Returns the first value of the specified tag type, or NULL if none
  * is present in this tag object.
  */