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Annotation of 43BSD/contrib/rn/bits.h, revision 1.1.1.1

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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