Source:Hack 1.0/hack.rumors.c

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Below is the full text to hack.rumors.c from the source code of Hack 1.0. To link to a particular line, write [[Hack 1.0/hack.rumors.c#line123]], for example.

Warning! This is the source code from an old release. For the latest release, see Source code

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1.    /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1984. */
2.    
3.    #include	<stdio.h>
4.    #include	"config.h"
5.    #define	CHARSZ	8	/* number of bits in a char */
6.    #define	RUMORFILE	"rumors"
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")) == NULL) 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.   }