Commit | Line | Data |
---|---|---|
15637ed4 RG |
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
61 | used(i) register int i; { | |
62 | return(usedbits[i/CHARSZ] & (1 << (i % CHARSZ))); | |
63 | } |