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Annotation of 43BSD/contrib/rn/bits.h, revision 1.1

1.1     ! root        1: /* $Header: bits.h,v 4.3 85/05/01 11:36:39 lwall Exp $
        !             2:  *
        !             3:  * $Log:       bits.h,v $
        !             4:  * Revision 4.3  85/05/01  11:36:39  lwall
        !             5:  * Baseline for release with 4.3bsd.
        !             6:  * 
        !             7:  */
        !             8: 
        !             9: EXT char *ctlarea INIT(Nullch);        /* one bit for each article in current newsgroup */
        !            10:                        /* with the following interpretation: */
        !            11:                        /*      0 => unread  */
        !            12:                        /*      1 => read    */
        !            13: 
        !            14: /* if subscripting is faster than shifting on your machine, define this */
        !            15: #undef USESUBSCRIPT
        !            16: #ifdef USESUBSCRIPT
        !            17: EXT char powerof2[] INIT({1,2,4,8,16,32,64,128});
        !            18: #define pow2(x) powerof2[x]
        !            19: #else
        !            20: #define pow2(x) (1 << (x))
        !            21: #endif
        !            22: 
        !            23: #ifdef lint
        !            24: EXT bool nonesuch INIT(FALSE);
        !            25: #define ctl_set(a)
        !            26: #define ctl_clear(a)
        !            27: #define ctl_read(a) nonesuch
        !            28: #define was_read(a) nonesuch
        !            29: #else
        !            30: #define ctl_set(a) (ctlarea[(OFFSET(a)) / BITSPERBYTE] |= pow2((OFFSET(a)) % BITSPERBYTE))
        !            31: #define ctl_clear(a) (ctlarea[(OFFSET(a)) / BITSPERBYTE] &= ~pow2((OFFSET(a)) % BITSPERBYTE))
        !            32: #define ctl_read(a) ((ctlarea[(OFFSET(a)) / BITSPERBYTE] & pow2((OFFSET(a)) % BITSPERBYTE)) != 0)
        !            33: 
        !            34: #define was_read(a) ((a)<firstart || ctl_read(a))
        !            35: #endif lint
        !            36: 
        !            37: EXT ART_NUM absfirst INIT(0);  /* 1st real article in current newsgroup */
        !            38: EXT ART_NUM firstart INIT(0);  /* minimum unread article number in newsgroup */
        !            39: EXT ART_NUM lastart INIT(0);   /* maximum article number in newsgroup */
        !            40: 
        !            41: #ifdef DELAYMARK
        !            42: EXT FILE *dmfp INIT(Nullfp);
        !            43: EXT char *dmname INIT(Nullch);
        !            44: EXT int dmcount INIT(0);
        !            45: #endif
        !            46: 
        !            47: void   bits_init();
        !            48: void   checkpoint_rc();
        !            49: void   restore_ng();
        !            50: void   onemore();
        !            51: void   oneless();
        !            52: void   unmark_as_read();
        !            53: void   delay_unmark();
        !            54: void   mark_as_read();
        !            55: void   check_first();
        !            56: #ifdef DELAYMARK
        !            57:     void       yankback();
        !            58: #endif
        !            59: int    chase_xrefs();
        !            60: int    initctl();
        !            61: void   grow_ctl();

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