Implement -printf/-fprintf

Based on a patch by Fangrui Song <i@maskray.me>.
Closes #16.

1 files changed, 2 insertions, 0 deletions

diff --git a/bftw.h b/bftw.h
index 80a66c9..2fb1ef0 100644
--- a/bftw.h
+++ b/bftw.h
@@ -64,6 +64,8 @@ struct BFTW {
 	/** The string offset of the filename. */
 	size_t nameoff;
 
+	/** The root path passed to bftw(). */
+	const char *root;
 	/** The depth of this file in the traversal. */
 	size_t depth;
 	/** Which visit this is. */