created a test directory to hold test guest OSes

[palacios.git] / test / geekos_test_vm / include / libc / fmtout.h

diff --git a/test/geekos_test_vm/include/libc/fmtout.h b/test/geekos_test_vm/include/libc/fmtout.h
new file mode 100644 (file)
index 0000000..429d7fd
--- /dev/null
+++ b/test/geekos_test_vm/include/libc/fmtout.h
@@ -0,0 +1,37 @@
+/*
+ * Generalized support for printf()-style formatted output
+ * Copyright (c) 2004, David H. Hovemeyer <daveho@cs.umd.edu>
+ * $Revision: 1.1 $
+ *
+ * This is free software.  You are permitted to use,
+ * redistribute, and modify it as specified in the file "COPYING".
+ */
+
+#ifndef OUTPUT_H
+#define OUTPUT_H
+
+#include <stdarg.h>
+
+/*
+ * An output sink for Format_Output().
+ * Useful for emitting formatted output to a function
+ * or a buffer.
+ */
+struct Output_Sink {
+    /*
+     * Emit a single character of output.
+     * This is called for all output characters,
+     * in order.
+     */
+    void (*Emit)(struct Output_Sink *o, int ch);
+
+    /*
+     * Finish the formatted output. Called after all characters
+     * have been emitted.
+     */
+    void (*Finish)(struct Output_Sink *o);
+};
+
+int Format_Output(struct Output_Sink *q, const char *format, va_list ap);
+
+#endif /* OUTPUT_H */