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/* $OpenBSD: db_hangman.c,v 1.17 2001/06/29 04:52:17 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 AUTHOR ``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 <sys/param.h>
#include <vm/vm.h>
#include <machine/db_machdep.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
#include <ddb/db_output.h>
#include <dev/cons.h>
#include <dev/rndvar.h>
#define TOLOWER(c) (('A'<=(c)&&(c)<='Z')?(c)-'A'+'a':(c))
#define ISALPHA(c) (('a'<=(c)&&(c)<='z')||('A'<=(c)&&(c)<='Z'))
void db_hang __P((int, char *, char *));
static int skill;
u_long db_plays, db_guesses;
static __inline size_t
db_random(size_t mod)
{
return arc4random() % mod;
}
struct db_hang_forall_arg {
int cnt;
db_sym_t sym;
};
/*
* Horrible abuse of the forall function, but we're not in a hurry.
*/
static void db_hang_forall __P((db_symtab_t *, db_sym_t, char *, char *, int,
void *));
static void
db_hang_forall(stab, sym, name, suff, pre, varg)
db_symtab_t *stab;
db_sym_t sym;
char *name;
char *suff;
int pre;
void *varg;
{
struct db_hang_forall_arg *arg = (struct db_hang_forall_arg *)varg;
if (--arg->cnt == 0)
arg->sym = sym;
}
static __inline char *
db_randomsym(size_t *lenp)
{
extern db_symtab_t db_symtabs[];
db_symtab_t *stab;
int nsymtabs, nsyms;
char *p, *q;
struct db_hang_forall_arg dfa;
for (nsymtabs = 0; db_symtabs[nsymtabs].name != NULL; nsymtabs++)
;
if (nsymtabs == 0)
return (NULL);
stab = &db_symtabs[db_random(nsymtabs)];
dfa.cnt = 1000000;
X_db_forall(stab, db_hang_forall, &dfa);
if (dfa.cnt <= 0)
return (NULL);
nsyms = 1000000 - dfa.cnt;
if (nsyms == 0)
return (NULL);
dfa.cnt = db_random(nsyms);
X_db_forall(stab, db_hang_forall, &dfa);
q = db_qualify(dfa.sym, stab->name);
/* don't show symtab name if there are less than 3 of 'em */
if (nsymtabs < 3)
while(*q++ != ':');
/* strlen(q) && ignoring underscores and colons */
for ((*lenp) = 0, p = q; *p; p++)
if (ISALPHA(*p))
(*lenp)++;
return (q);
}
static const char hangpic[]=
"\n88888 \r\n"
"9 7 6 \r\n"
"97 5 \r\n"
"9 423\r\n"
"9 2 \r\n"
"9 1 0\r\n"
"9\r\n"
"9 ";
static const char substchar[]="\\/|\\/O|/-|";
void
db_hang(tries, word, abc)
int tries;
register char *word;
register char *abc;
{
register const char *p;
for(p=hangpic; *p; p++)
cnputc((*p>='0' && *p<='9') ? ((tries<=(*p)-'0') ?
substchar[(*p)-'0'] : ' ') : *p);
for (p = word; *p; p++)
cnputc(ISALPHA(*p) && abc[TOLOWER(*p) - 'a'] == '-'?'-':*p);
db_printf(" (");
for (p = abc; *p; p++)
if (*p == '_')
cnputc('a' + (p - abc));
db_printf(")\r");
}
static __inline 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 = skill + 1;
word = db_randomsym(&len);
if (word == NULL)
return (0);
db_plays++;
}
{
register char c;
db_hang(tries, word, abc);
c = cngetc();
c = TOLOWER(c);
if (ISALPHA(c) && abc[c - 'a'] == '-') {
register char *p;
register size_t n;
/* strchr(word,c) */
for (n = 0, p = word; *p ; p++)
if (TOLOWER(*p) == c)
n++;
if (n) {
abc[c - 'a'] = c;
len -= n;
} else {
abc[c - 'a'] = '_';
tries--;
}
}
}
if (tries && len)
return (1);
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;
db_guesses++;
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 = 3;
while (db_hangon());
}
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