games/hack/hack.rumors.c

   1 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
   2 /* hack.rumors.c - version 1.0.3 */
   3 /* $FreeBSD: src/games/hack/hack.rumors.c,v 1.3 1999/11/16 02:57:10 billf Exp $ */
   4 /* $DragonFly: src/games/hack/hack.rumors.c,v 1.2 2003/06/17 04:25:24 dillon Exp $ */
   5
   6 #include        <stdio.h>
   7 #include        "hack.h"                /* for RUMORFILE and BSD (index) */
   8 #define CHARSZ  8                       /* number of bits in a char */
   9 extern long *alloc();
  10 extern char *index();
  11 int n_rumors = 0;
  12 int n_used_rumors = -1;
  13 char *usedbits;
  14
  15 init_rumors(rumf) FILE *rumf; {
  16 int i;
  17         n_used_rumors = 0;
  18         while(skipline(rumf)) n_rumors++;
  19         rewind(rumf);
  20         i = n_rumors/CHARSZ;
  21         usedbits = (char *) alloc((unsigned)(i+1));
  22         for( ; i>=0; i--) usedbits[i] = 0;
  23 }
  24
  25 skipline(rumf) FILE *rumf; {
  26 char line[COLNO];
  27         while(1) {
  28                 if(!fgets(line, sizeof(line), rumf)) return(0);
  29                 if(index(line, '\n')) return(1);
  30         }
  31 }
  32
  33 outline(rumf) FILE *rumf; {
  34 char line[COLNO];
  35 char *ep;
  36         if(!fgets(line, sizeof(line), rumf)) return;
  37         if((ep = index(line, '\n')) != 0) *ep = 0;
  38         pline("This cookie has a scrap of paper inside! It reads: ");
  39         pline(line);
  40 }
  41
  42 outrumor(){
  43 int rn,i;
  44 FILE *rumf;
  45         if(n_rumors <= n_used_rumors ||
  46           (rumf = fopen(RUMORFILE, "r")) == (FILE *) 0) return;
  47         if(n_used_rumors < 0) init_rumors(rumf);
  48         if(!n_rumors) goto none;
  49         rn = rn2(n_rumors - n_used_rumors);
  50         i = 0;
  51         while(rn || used(i)) {
  52                 (void) skipline(rumf);
  53                 if(!used(i)) rn--;
  54                 i++;
  55         }
  56         usedbits[i/CHARSZ] |= (1 << (i % CHARSZ));
  57         n_used_rumors++;
  58         outline(rumf);
  59 none:
  60         (void) fclose(rumf);
  61 }
  62
  63 used(i) int i; {
  64         return(usedbits[i/CHARSZ] & (1 << (i % CHARSZ)));
  65 }