diff --git a/scsh/aix/stdio_dep.c b/scsh/aix/stdio_dep.c
index 35951b8..a041ee2 100644
--- a/scsh/aix/stdio_dep.c
+++ b/scsh/aix/stdio_dep.c
@@ -70,3 +70,16 @@ int fbufcount(FILE* fs)
 { 
   return(fs->_cnt);
 }
+
+/* Returns true if there is no buffered data in stream FS
+** (or there is no buffering, period.)
+*/
+
+int ibuf_empty(FILE *fs) {return fs->_cnt <= 0;}
+
+
+/* Returns true if the buffer in stream FS is full 
+** (or there is no buffering, period).
+*/
+
+int obuf_full(FILE *fs) {return fs->_cnt <= 0;}