(2006-08-06) rescue-bootcd

extra/syslinux-3.09/com32/lib/sys/rawcon_write.c

@@ -0,0 +1,67 @@
+#ident "$Id: rawcon_write.c,v 1.2 2004/11/23 23:43:02 hpa Exp $"
+/* ----------------------------------------------------------------------- *
+ *   
+ *   Copyright 2004 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.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * rawcon_write.c
+ *
+ * Raw writing to the console; no \n -> \r\n translation
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <com32.h>
+#include <minmax.h>
+#include "file.h"
+
+static ssize_t __rawcon_write(struct file_info *fp, const void *buf, size_t count)
+{
+  com32sys_t ireg;
+  const char *bufp = buf;
+  size_t n = 0;
+
+  (void)fp;
+
+  memset(&ireg, 0, sizeof ireg); 
+  ireg.eax.b[1] = 0x02;
+
+  while ( count-- ) {
+    ireg.edx.b[0] = *bufp++;
+    __intcall(0x21, &ireg, NULL);
+    n++;
+  }
+
+  return n;
+}
+
+const struct output_dev dev_rawcon_w = {
+  .dev_magic  = __DEV_MAGIC,
+  .flags      = __DEV_TTY | __DEV_OUTPUT,
+  .fileflags  = O_WRONLY | O_CREAT | O_TRUNC | O_APPEND,
+  .write      = __rawcon_write,
+  .close      = NULL,
+};