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/* $OpenBSD: db_hangman.c,v 1.1 1996/05/05 12:23:14 mickey Exp $ */
/*
* Copyright (c) 1996 Theo de Raadt, Michael Shalayeff
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Michael Shalayeff.
* 4. The name of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 REGENTS 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.
*
*/
#include <sys/param.h>
#include <machine/db_machdep.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
#include <dev/cons.h>
#include "rnd.h"
#if NRND
#include <dev/rndvar.h>
#endif
#define TOLOWER(c) (('A'<=(c)&&(c)<='Z')?(c)-'a'+'A':(c))
#define ISALPHA(c) (('a'<=(c)&&(c)<='z')||('A'<=(c)&&(c)<='Z'))
static __inline size_t
db_random( mod )
register size_t mod;
{
#if NRND
size_t ret;
get_random_bytes(&ret, sizeof(ret) );
return ret % mod;
#else
u_int random();
return (size_t)(random() % mod);
#endif
}
static int skill;
static __inline char *
db_randomsym(lenp)
size_t *lenp;
{
register char *p, *q;
/* choose random symtab */
register db_symtab_t *stab = db_istab(db_random(db_nsymtabs));
/* choose random symbol from the table */
q = db_qualify(X_db_isym(stab, db_random(X_db_nsyms(stab))),stab->name);
/* strlen(q) && ignoring underscores and colons */
for ((*lenp) = 0, p = q; *p; p++)
if (ISALPHA(*p))
(*lenp)++;
return q;
}
static int
db_hang(tries, word, abc)
int tries;
register char *word;
register char *abc;
{
register char *p;
register int n = 6;
cnputc(' ');
for (p = word; *p; p++, n++)
if (ISALPHA(*p))
cnputc(abc[TOLOWER(*p) - 'a']);
else
cnputc(*p);
cnputc(' ');
cnputc('(');
cnputc('0' + tries);
cnputc(' ');
for (p = abc; *p; p++)
if (*p == '_') {
cnputc('a' + (p - abc));
n++;
}
cnputc(')');
/* position to the beginning of the line */
while (n--)
cnputc('\b');
}
static int
db_hangon(void)
{
static size_t len;
static size_t tries;
static char *word = NULL;
static char abc[26+1]; /* for '\0' */
if (word == NULL) {
register char *p;
for (p = abc; p < &abc[sizeof(abc)-1]; p++)
*p = '-';
*p = '\0';
tries = 2 * (1 + skill / 3);
word = db_randomsym(&len);
}
{
register char c, c1;
db_hang(tries, word, abc);
c1 = cngetc();
c = TOLOWER(c1);
if (ISALPHA(c) && abc[c - 'a'] == '-') {
register char *p;
register size_t n;
/* strchr(word,c) */
for (n = 0, p = word; *p ; p++)
if (*p == c)
n++;
if (n) {
abc[c - 'a'] = c1;
len -= n;
} else {
abc[c - 'a'] = '_';
tries--;
}
}
}
if (tries && len)
return db_hangon();
if (!tries && skill > 2)
{
register char *p = word;
for (; *p; p++)
if (ISALPHA(*p))
abc[TOLOWER(*p) - 'a'] = *p;
}
db_hang(tries, word, abc);
cnputc('\n');
word = NULL;
return !tries;
}
void
db_hangman( addr, haddr, count, modif)
db_expr_t addr;
int haddr;
db_expr_t count;
char *modif;
{
if (modif[0] == 's' && '0' <= modif[1] && modif[1] <= '9')
skill = modif[1] - '0';
else
skill = 0;
while (db_hangon());
}
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