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

1.1     ! root        1: /* lfgetc.c - lfgetc */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <proc.h>
        !             6: #include <disk.h>
        !             7: #include <lfile.h>
        !             8: #include <dir.h>
        !             9: 
        !            10: /*------------------------------------------------------------------------
        !            11:  *  lfgetc  --  get next character from (buffered) disk file
        !            12:  *------------------------------------------------------------------------
        !            13:  */
        !            14: lfgetc(devptr)
        !            15: struct devsw   *devptr;
        !            16: {
        !            17:        struct  flblk   *flptr;
        !            18:        char    nextch;
        !            19:        char    ps;
        !            20: 
        !            21:        disable(ps);
        !            22:        flptr = (struct flblk *)devptr->dvioblk;
        !            23:        if (flptr->fl_pid!=currpid || !(flptr->fl_mode&FLREAD)) {
        !            24:                restore(ps);
        !            25:                return(SYSERR);
        !            26:        }
        !            27:        if (flptr->fl_pos >= (flptr->fl_dent)->fdlen) {
        !            28:                restore(ps);
        !            29:                return(EOF);
        !            30:        }
        !            31:        if (flptr->fl_bptr >= &flptr->fl_buff[DBUFSIZ]) {
        !            32:                if (flptr->fl_dch)
        !            33:                        lfsflush(flptr);
        !            34:                lfsetup(flptr->fl_dev, flptr);
        !            35:        }
        !            36:        nextch = *(flptr->fl_bptr)++;
        !            37:        flptr->fl_pos++;
        !            38:        restore(ps);
        !            39:        return(nextch);
        !            40: }

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