Add C string helper to membuffer interface

I don't know why I didn't do this from the beginning.  We often build up
a membuffer and then want to use it as a C string.  You could do it by
hand by adding the zero byte at the end, but that's just annoying.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/membuffer.c b/membuffer.c
index fd179244b..8ba23ebe2 100644
--- a/membuffer.c
+++ b/membuffer.c
@@ -55,6 +55,13 @@ static void make_room(struct membuffer *b, unsigned int size)
 	}
 }
 
+const char *mb_cstring(struct membuffer *b)
+{
+	make_room(b, 1);
+	b->buffer[b->len] = 0;
+	return b->buffer;
+}
+
 void put_bytes(struct membuffer *b, const char *str, int len)
 {
 	make_room(b, len);