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

1.1     ! root        1: /* lfseek.c - lfseek */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <disk.h>
        !             6: #include <lfile.h>
        !             7: #include <dir.h>
        !             8: 
        !             9: /*------------------------------------------------------------------------
        !            10:  *  lfseek  --  seek to a specified position of a file
        !            11:  *------------------------------------------------------------------------
        !            12:  */
        !            13: lfseek(devptr, offset)
        !            14: struct devsw   *devptr;
        !            15: long   offset;
        !            16: {
        !            17:        struct  flblk   *flptr;
        !            18:        int     retcode;
        !            19:        char    ps;
        !            20: 
        !            21:        disable(ps);
        !            22:        flptr = (struct flblk *)devptr->dvioblk;
        !            23:        if (flptr->fl_mode & FLWRITE) {
        !            24:                if (flptr->fl_dch)
        !            25:                        lfsflush(flptr);
        !            26:        } else if (offset > (flptr->fl_dent)->fdlen) {
        !            27:                        restore(ps);
        !            28:                        return(SYSERR);
        !            29:        }
        !            30:        flptr->fl_pos = offset;
        !            31:        retcode = lfsetup(flptr->fl_dev, flptr);
        !            32:        restore(ps);
        !            33:        return(retcode);
        !            34: }

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