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/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* hack.rumors.c - version 1.0.3 */
/* $FreeBSD: src/games/hack/hack.rumors.c,v 1.3 1999/11/16 02:57:10 billf Exp $ */
#include "hack.h" /* for RUMORFILE and BSD (index) */
#define CHARSZ 8 /* number of bits in a char */
int n_rumors = 0;
int n_used_rumors = -1;
char *usedbits;
static void init_rumors(FILE *);
static bool skipline(FILE *);
static void outline(FILE *);
static bool used(int);
static void
init_rumors(FILE *rumf)
{
int i;
n_used_rumors = 0;
while (skipline(rumf))
n_rumors++;
rewind(rumf);
i = n_rumors / CHARSZ;
usedbits = alloc((unsigned)(i + 1));
for (; i >= 0; i--)
usedbits[i] = 0;
}
static bool
skipline(FILE *rumf)
{
char line[COLNO];
for (;;) {
if (!fgets(line, sizeof(line), rumf))
return (0);
if (strchr(line, '\n'))
return (1);
}
}
static void
outline(FILE *rumf)
{
char line[COLNO];
char *ep;
if (!fgets(line, sizeof(line), rumf))
return;
if ((ep = strchr(line, '\n')) != NULL)
*ep = 0;
pline("This cookie has a scrap of paper inside! It reads: ");
pline("%s", line);
}
void
outrumor(void)
{
int rn, i;
FILE *rumf;
if (n_rumors <= n_used_rumors ||
(rumf = fopen(RUMORFILE, "r")) == NULL)
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)) {
skipline(rumf);
if (!used(i))
rn--;
i++;
}
usedbits[i / CHARSZ] |= (1 << (i % CHARSZ));
n_used_rumors++;
outline(rumf);
none:
fclose(rumf);
}
static bool
used(int i)
{
return (usedbits[i / CHARSZ] & (1 << (i % CHARSZ)));
}
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