Return to dos_rename.c CVS log

Up to [GnuMach] / Gnu-Mach / i386 / dos

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

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.