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/* $OpenBSD: hack.rumors.c,v 1.9 2016/01/09 18:33:15 mestre Exp $ */
/*
* Copyright (c) 1985, Stichting Centrum voor Wiskunde en Informatica,
* Amsterdam
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the Stichting Centrum voor Wiskunde en
* Informatica, nor the names of its contributors may be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1982 Jay Fenlason <hack@gnu.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#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 int skipline(FILE *);
static void outline(FILE *);
static int 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 = (char *) alloc((unsigned)(i+1));
for( ; i>=0; i--) usedbits[i] = 0;
}
static int
skipline(FILE *rumf)
{
char line[COLNO];
while(1) {
if(!fgets(line, sizeof(line), rumf)) return(0);
if(strchr(line, '\n')) return(1);
}
}
static void
outline(FILE *rumf)
{
char line[COLNO];
if(!fgets(line, sizeof(line), rumf)) return;
line[strcspn(line, "\n")] = '\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")) == (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);
}
static int
used(int i)
{
return(usedbits[i/CHARSZ] & (1 << (i % CHARSZ)));
}
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