dprintf: a generic debug-to-serial infrastructure

Actually provide real infrastructure for debug-to-serial.  Very
useful when debugging fullscreen applications, especially under an
emulator like Qemu.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/com32/lib/dprintf.c b/com32/lib/dprintf.c
new file mode 100644
index 00000000..96170237
--- /dev/null
+++ b/com32/lib/dprintf.c
@@ -0,0 +1,17 @@
+/*
+ * dprintf.c
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+
+int dprintf(const char *format, ...)
+{
+    va_list ap;
+    int rv;
+
+    va_start(ap, format);
+    rv = vdprintf(stdout, format, ap);
+    va_end(ap);
+    return rv;
+}