1 files changed, 71 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/lib/sys/serial_write.c b/contrib/syslinux-4.02/com32/lib/sys/serial_write.c
new file mode 100644
index 0000000..fa0f4f4
--- /dev/null
+++ b/contrib/syslinux-4.02/com32/lib/sys/serial_write.c
@@ -0,0 +1,71 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
+ *
+ *   Permission is hereby granted, free of charge, to any person
+ *   obtaining a copy of this software and associated documentation
+ *   files (the "Software"), to deal in the Software without
+ *   restriction, including without limitation the rights to use,
+ *   copy, modify, merge, publish, distribute, sublicense, and/or
+ *   sell copies of the Software, and to permit persons to whom
+ *   the Software is furnished to do so, subject to the following
+ *   conditions:
+ *
+ *   The above copyright notice and this permission notice shall
+ *   be included in all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *   OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * serial_write.c
+ *
+ * Raw writing to the serial port; no \n -> \r\n translation
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <com32.h>
+#include <minmax.h>
+#include <syslinux/config.h>
+#include "file.h"
+
+ssize_t __serial_write(struct file_info *fp, const void *buf, size_t count)
+{
+    com32sys_t ireg;
+    const char *bufp = buf;
+    size_t n = 0;
+
+    (void)fp;
+
+    if (!syslinux_serial_console_info()->iobase)
+	return count;		/* Nothing to do */
+
+    memset(&ireg, 0, sizeof ireg);
+    ireg.eax.b[1] = 0x04;
+
+    while (count--) {
+	ireg.edx.b[0] = *bufp++;
+	__intcall(0x21, &ireg, NULL);
+	n++;
+    }
+
+    return n;
+}
+
+const struct output_dev dev_serial_w = {
+    .dev_magic = __DEV_MAGIC,
+    .flags = __DEV_TTY | __DEV_OUTPUT,
+    .fileflags = O_WRONLY | O_CREAT | O_TRUNC | O_APPEND,
+    .write = __serial_write,
+    .close = NULL,
+    .open = NULL,
+};