buffer: add buffer_insert to insert data at an arbitrary position

Use it to implement buffer_{pre,ap}pend.

1 files changed, 4 insertions, 0 deletions

diff --git a/buffer.h b/buffer.h
index 85679c8..4c5ae33 100644
--- a/buffer.h
+++ b/buffer.h
@@ -23,6 +23,10 @@ void buffer_truncate(Buffer*);
 bool buffer_put(Buffer*, const void *data, size_t len);
 /* same but with NUL-terminated data */
 bool buffer_put0(Buffer*, const char *data);
+/* insert arbitrary data of length len at pos (in [0, buf->len]) */
+bool buffer_insert(Buffer*, size_t pos, const void *data, size_t len);
+/* insert NUL-terminate data at pos (in [0, buf->len]) */
+bool buffer_insert0(Buffer*, size_t pos, const char *data);
 /* append futher content to the end of the buffer data */
 bool buffer_append(Buffer*, const void *data, size_t len);
 /* append NUl-terminated data */