Add k5_buf_get_space

Add a new k5_buf method to make room in the buffer for the caller to
fill in.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/include/k5-buf.h b/src/include/k5-buf.h
index c5576a3..da10fd9 100644
--- a/src/include/k5-buf.h
+++ b/src/include/k5-buf.h
@@ -91,6 +91,10 @@ void k5_buf_add_fmt(struct k5buf *buf, const char *fmt, ...)
 #endif
     ;
 
+/* Extend the length of buf by len and return a pointer to the reserved space,
+ * to be filled in by the caller.  Return NULL on error. */
+void *k5_buf_get_space(struct k5buf *buf, size_t len);
+
 /* Truncate BUF.  LEN must be between 0 and the existing buffer
  * length, or an assertion failure will result. */
 void k5_buf_truncate(struct k5buf *buf, size_t len);