music_pipe: added music_pipe_peek()

music_pipe_peek() is similar to music_pipe_shift(), but doesn't remove the chunk. This allows it to be used with a "const" music_pipe.

music_pipe: added music_pipe_peek()
39d35219 · Max Kellermann · b13cd03f · 39d35219 · 39d35219
Commit 39d35219 authored Mar 07, 2009 by Max Kellermann
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pipe.c src/pipe.c +6 -0

pipe.h src/pipe.h +7 -0

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--- a/src/pipe.c
+++ b/src/pipe.c
@@ -61,6 +61,12 @@ music_pipe_free(struct music_pipe *mp)
 	g_free(mp);
 }
+const struct music_chunk *
+music_pipe_peek(const struct music_pipe *mp)
+{
+	return mp->head;
+}
 struct music_chunk *
 music_pipe_shift(struct music_pipe *mp)
 {

--- a/src/pipe.h
+++ b/src/pipe.h
@@ -41,6 +41,13 @@ void
 music_pipe_free(struct music_pipe *mp);
 /**
+ * Returns the first #music_chunk from the pipe.  Returns NULL if the
+ * pipe is empty.
+ */
+const struct music_chunk *
+music_pipe_peek(const struct music_pipe *mp);
+/**
 * Removes the first chunk from the head, and returns it.
 */
 struct music_chunk *