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