Initial source

1 files changed, 45 insertions, 0 deletions

diff --git a/i386/dos/dos_seek.c b/i386/dos/dos_seek.c
new file mode 100644
index 0000000..ba61d87
--- /dev/null
+++ b/i386/dos/dos_seek.c
@@ -0,0 +1,45 @@
+/* 
+ * Copyright (c) 1995-1994 The University of Utah and
+ * the Computer Systems Laboratory at the University of Utah (CSL).
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software is hereby
+ * granted provided that (1) source code retains these copyright, permission,
+ * and disclaimer notices, and (2) redistributions including binaries
+ * reproduce the notices in supporting documentation, and (3) all advertising
+ * materials mentioning features or use of this software display the following
+ * acknowledgement: ``This product includes software developed by the
+ * Computer Systems Laboratory at the University of Utah.''
+ *
+ * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
+ * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
+ * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * CSL requests users of this software to return to csl-dist@cs.utah.edu any
+ * improvements that they make and grant CSL redistribution rights.
+ *
+ *      Author: Bryan Ford, University of Utah CSL
+ */
+
+#include <unistd.h>
+#include <errno.h>
+
+#include "dos_io.h"
+
+int dos_seek(dos_fd_t fd, vm_offset_t offset, int whence, vm_offset_t *out_newpos)
+{
+	struct real_call_data real_call_data;
+	int err;
+
+	dos_init_rcd(&real_call_data);
+	real_call_data.eax = 0x4200 | whence;
+	real_call_data.ebx = fd;
+	real_call_data.ecx = (unsigned)offset >> 16;
+	real_call_data.edx = (unsigned)offset & 0xffff;
+	real_int(0x21, &real_call_data);
+	if (err = dos_check_err(&real_call_data))
+		return err;
+	*out_newpos = (real_call_data.edx << 16) | (real_call_data.eax & 0xffff);
+	return 0;
+}
+