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Annotation of xinu/sys/LSI/dsopen.c, revision 1.1

1.1     ! root        1: /* dsopen.c - dsopen */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <disk.h>
        !             6: #include <lfile.h>
        !             7: #include <dir.h>
        !             8: 
        !             9: /*------------------------------------------------------------------------
        !            10:  *  dsopen  --  open/create a file on the specified disk device
        !            11:  *------------------------------------------------------------------------
        !            12:  */
        !            13: #ifdef Ndf
        !            14: dsopen(devptr, filenam, mode)
        !            15: struct devsw   *devptr;
        !            16: char   *filenam;
        !            17: char   *mode;
        !            18: {
        !            19:        struct  dir     *dirptr;
        !            20:        struct  flblk   *flptr;
        !            21:        struct  fdes    *fdptr;
        !            22:        DBADDR  dba;
        !            23:        int     mbits, findex;
        !            24:        int     retcode;
        !            25:        char    ps;
        !            26: 
        !            27:        disable(ps);
        !            28:        dirptr = dsdirec(devptr->dvnum);
        !            29:        if ( (mbits=ckmode(mode)) == SYSERR)
        !            30:                retcode = SYSERR;
        !            31:        else if( (int)(fdptr=dfdsrch(devptr->dvioblk,filenam,mbits))
        !            32:                == SYSERR)
        !            33:                retcode = SYSERR;
        !            34:        else if ( (findex=dfalloc()) == SYSERR)
        !            35:                retcode = SYSERR;
        !            36:        else {
        !            37:                flptr = &fltab[findex];
        !            38:                flptr->fl_dev = devptr->dvnum;
        !            39:                flptr->fl_dent = fdptr;
        !            40:                flptr->fl_mode = mbits & FLRW;
        !            41:                flptr->fl_iba = fdptr->fdiba;
        !            42:                ibget(flptr->fl_dev, flptr->fl_iba, &(flptr->fl_iblk));
        !            43:                flptr->fl_pos = 0L;
        !            44:                flptr->fl_dch = FALSE;
        !            45:                dba = flptr->fl_iblk.ib_dba[flptr->fl_ipnum = 0];
        !            46:                if (dba != DBNULL) {
        !            47:                        read(flptr->fl_dev, flptr->fl_buff, dba);
        !            48:                        flptr->fl_bptr = flptr->fl_buff;
        !            49:                } else
        !            50:                        flptr->fl_bptr = &flptr->fl_buff[DBUFSIZ];
        !            51:                retcode = flptr->fl_id;
        !            52:        }
        !            53:        restore(ps);
        !            54:        return(retcode);
        !            55: }
        !            56: #endif

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