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Annotation of Gnu-Mach/i386/dos/dos_rename.c, revision 1.1.1.1

1.1       root        1: /* 
                      2:  * Copyright (c) 1995-1994 The University of Utah and
                      3:  * the Computer Systems Laboratory at the University of Utah (CSL).
                      4:  * All rights reserved.
                      5:  *
                      6:  * Permission to use, copy, modify and distribute this software is hereby
                      7:  * granted provided that (1) source code retains these copyright, permission,
                      8:  * and disclaimer notices, and (2) redistributions including binaries
                      9:  * reproduce the notices in supporting documentation, and (3) all advertising
                     10:  * materials mentioning features or use of this software display the following
                     11:  * acknowledgement: ``This product includes software developed by the
                     12:  * Computer Systems Laboratory at the University of Utah.''
                     13:  *
                     14:  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
                     15:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
                     16:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     17:  *
                     18:  * CSL requests users of this software to return to [email protected] any
                     19:  * improvements that they make and grant CSL redistribution rights.
                     20:  *
                     21:  *      Author: Bryan Ford, University of Utah CSL
                     22:  */
                     23: 
                     24: #include <unistd.h>
                     25: #include <errno.h>
                     26: 
                     27: #include "dos_io.h"
                     28: #include "vm_param.h"
                     29: 
                     30: int dos_rename(const char *oldpath, const char *newpath)
                     31: {
                     32:        /* This function isn't fully atomic like on Unix,
                     33:           but it's as close as I know how to do under DOS.  */
                     34: 
                     35:        struct real_call_data real_call_data;
                     36:        vm_offset_t dos_buf_phys = (vm_offset_t)kvtophys(dos_buf);
                     37:        int err;
                     38: 
                     39:        dos_init_rcd(&real_call_data);
                     40: 
                     41:        /* Put the oldpath in the first half of dos_buf,
                     42:           and the newpath in the second half.  */
                     43:        if ((strlen(oldpath)+1 > DOS_BUF_SIZE/2)
                     44:            || (strlen(newpath)+1 > DOS_BUF_SIZE/2))
                     45:                { errno = E2BIG; return -1; }
                     46:        strcpy(dos_buf, oldpath);
                     47:        strcpy(dos_buf+DOS_BUF_SIZE/2, newpath);
                     48: 
                     49:        /* Try once to rename the file.  */
                     50:        real_call_data.eax = 0x5600;
                     51:        real_call_data.ds = dos_buf_phys >> 4;
                     52:        real_call_data.edx = dos_buf_phys & 15;
                     53:        real_call_data.es = dos_buf_phys >> 4;
                     54:        real_call_data.edi = (dos_buf_phys & 15) + DOS_BUF_SIZE/2;
                     55:        real_int(0x21, &real_call_data);
                     56: 
                     57:        /* If that failed, delete newpath and then retry the rename.
                     58:           We _hope_ the failure was because newpath already existed;
                     59:           the DOS error codes I'm getting back seem to be bogus.  */
                     60:        if (err = dos_check_err(&real_call_data))
                     61:        {
                     62:                real_call_data.eax = 0x4100;
                     63:                real_call_data.ds = dos_buf_phys >> 4;
                     64:                real_call_data.edx = (dos_buf_phys & 15) + DOS_BUF_SIZE/2;
                     65:                real_int(0x21, &real_call_data);
                     66:                if (err = dos_check_err(&real_call_data))
                     67:                        return err;
                     68: 
                     69:                real_call_data.eax = 0x5600;
                     70:                real_call_data.ds = dos_buf_phys >> 4;
                     71:                real_call_data.edx = dos_buf_phys & 15;
                     72:                real_call_data.es = dos_buf_phys >> 4;
                     73:                real_call_data.edi = (dos_buf_phys & 15) + DOS_BUF_SIZE/2;
                     74:                real_int(0x21, &real_call_data);
                     75:                err = dos_check_err(&real_call_data);
                     76:        }
                     77: 
                     78:        return err;
                     79: }
                     80: 

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