1 files changed, 56 insertions, 0 deletions

diff --git a/firmware/common/fdprintf.c b/firmware/common/fdprintf.c
new file mode 100644
index 0000000000..21d0a72e58
--- /dev/null
+++ b/firmware/common/fdprintf.c
@@ -0,0 +1,56 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Felix Arends
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <limits.h>
+#include "file.h"
+#include "vuprintf.h"
+
+struct for_fprintf {
+    int fd;  /* where to store it */
+    int rem; /* amount remaining */
+};
+
+static int fprfunc(void *pr, int letter)
+{
+    struct for_fprintf *fpr  = (struct for_fprintf *)pr;
+
+    /* TODO: add a small buffer to reduce write() calls */
+    if (write(fpr->fd, &(char){ letter }, 1) > 0) {
+        return --fpr->rem;
+    }
+
+    return -1;
+}
+
+int fdprintf(int fd, const char *fmt, ...)
+{
+    int bytes;
+    struct for_fprintf fpr;
+    va_list ap;
+
+    fpr.fd  = fd;
+    fpr.rem = INT_MAX;
+
+    va_start(ap, fmt);
+    bytes = vuprintf(fprfunc, &fpr, fmt, ap);
+    va_end(ap);
+
+    return bytes;
+}