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/* $OpenBSD: hack.rumors.c,v 1.3 2001/01/28 23:41:45 niklas Exp $ */
/*
* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985.
*/
#ifndef lint
static char rcsid[] = "$OpenBSD: hack.rumors.c,v 1.3 2001/01/28 23:41:45 niklas Exp $";
#endif /* not lint */
#include <stdio.h>
#include "hack.h" /* for RUMORFILE and BSD (index) */
#define CHARSZ 8 /* number of bits in a char */
extern long *alloc();
int n_rumors = 0;
int n_used_rumors = -1;
char *usedbits;
init_rumors(rumf) register FILE *rumf; {
register int i;
n_used_rumors = 0;
while(skipline(rumf)) n_rumors++;
rewind(rumf);
i = n_rumors/CHARSZ;
usedbits = (char *) alloc((unsigned)(i+1));
for( ; i>=0; i--) usedbits[i] = 0;
}
skipline(rumf) register FILE *rumf; {
char line[COLNO];
while(1) {
if(!fgets(line, sizeof(line), rumf)) return(0);
if(strchr(line, '\n')) return(1);
}
}
outline(rumf) register FILE *rumf; {
char line[COLNO];
register char *ep;
if(!fgets(line, sizeof(line), rumf)) return;
if((ep = strchr(line, '\n')) != 0) *ep = 0;
pline("This cookie has a scrap of paper inside! It reads: ");
pline(line);
}
outrumor(){
register int rn,i;
register FILE *rumf;
if(n_rumors <= n_used_rumors ||
(rumf = fopen(RUMORFILE, "r")) == (FILE *) 0) return;
if(n_used_rumors < 0) init_rumors(rumf);
if(!n_rumors) goto none;
rn = rn2(n_rumors - n_used_rumors);
i = 0;
while(rn || used(i)) {
(void) skipline(rumf);
if(!used(i)) rn--;
i++;
}
usedbits[i/CHARSZ] |= (1 << (i % CHARSZ));
n_used_rumors++;
outline(rumf);
none:
(void) fclose(rumf);
}
used(i) register int i; {
return(usedbits[i/CHARSZ] & (1 << (i % CHARSZ)));
}
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