From f07a4c844da9f0ecae5bbee1ab94be56505f26f7 Mon Sep 17 00:00:00 2001 From: Thomas Bushnell Date: Tue, 25 Feb 1997 21:28:37 +0000 Subject: Initial source --- i386/dos/dos_seek.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 i386/dos/dos_seek.c (limited to 'i386/dos/dos_seek.c') 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 +#include + +#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; +} + -- cgit v1.2.3