1 files changed, 28 insertions, 0 deletions
diff --git a/src/base/bufio/refill.h b/src/base/bufio/refill.h
new file mode 100644
index 0000000..41e357e
--- /dev/null
+++ b/src/base/bufio/refill.h
@@ -0,0 +1,28 @@
+int
+refill(io·Buffer *buf)
+{
+    int n;
+
+    if(buf->state & bufio·end)
+        return bufio·err;
+
+    memcpy(buf->buf, buf->pos - bufio·ungets, bufio·ungets);
+
+    n = buf->rdr.read(buf->h, 1, buf->size, buf->beg);
+    if(n < 0)
+        return bufio·err;
+    if(n == 0){
+        buf->state |= bufio·end;
+        return 0;
+    }
+
+    buf->pos = buf->beg;
+    buf->end = buf->pos + n;
+
+    // TEST: put a physical EOF byte at the end
+    // this would allow for an unget operation
+    if(n < buf->size)
+        *buf->end++ =  EOF;
+
+    return n;
+}