--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/substdio_copy.c	Thu Nov 01 14:46:11 2007 +0100
@@ -0,0 +1,18 @@
+#include "substdio.h"
+
+int substdio_copy(ssout,ssin)
+register substdio *ssout;
+register substdio *ssin;
+{
+  register int n;
+  register char *x;
+
+  for (;;) {
+    n = substdio_feed(ssin);
+    if (n < 0) return -2;
+    if (!n) return 0;
+    x = substdio_PEEK(ssin);
+    if (substdio_put(ssout,x,n) == -1) return -3;
+    substdio_SEEK(ssin,n);
+  }
+}