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Annotation of xinu/sys/LSI/lfseek.c, revision 1.1.1.1

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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