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NetBSD/games/quiz/quiz.c

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/* $NetBSD: quiz.c,v 1.27 2014/03/23 00:07:15 dholland Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jim R. Oldroyd at The Instruction Set and Keith Gabryelski at
* Commodore Business Machines.
*
* 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. Neither the name of the University 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 REGENTS 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 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/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1991, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)quiz.c 8.3 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: quiz.c,v 1.27 2014/03/23 00:07:15 dholland Exp $");
#endif
#endif /* not lint */
#include <sys/types.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <time.h>
#include <unistd.h>
#include "quiz.h"
#include "pathnames.h"
static QE qlist;
static int catone, cattwo, tflag;
static unsigned qsize;
static char *appdstr(char *, const char *, size_t);
static void downcase(char *);
static void get_cats(char *, char *);
static void get_file(const char *);
static const char *next_cat(const char *);
static void quiz(void);
static void score(unsigned, unsigned, unsigned);
static void show_index(void);
static void usage(void) __dead;
int
main(int argc, char *argv[])
{
int ch;
const char *indexfile;
/* Revoke setgid privileges */
setgid(getgid());
indexfile = _PATH_QUIZIDX;
while ((ch = getopt(argc, argv, "i:t")) != -1)
switch(ch) {
case 'i':
indexfile = optarg;
break;
case 't':
tflag = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
switch(argc) {
case 0:
get_file(indexfile);
show_index();
break;
case 2:
get_file(indexfile);
get_cats(argv[0], argv[1]);
quiz();
break;
default:
usage();
}
exit(0);
}
static void
get_file(const char *file)
{
FILE *fp;
QE *qp;
size_t len;
char *lp;
if ((fp = fopen(file, "r")) == NULL)
err(1, "%s", file);
/*
* XXX
* Should really free up space from any earlier read list
* but there are no reverse pointers to do so with.
*/
qp = &qlist;
qsize = 0;
while ((lp = fgetln(fp, &len)) != NULL) {
if (lp[len - 1] == '\n')
lp[--len] = '\0';
if (qp->q_text && qp->q_text[strlen(qp->q_text) - 1] == '\\')
qp->q_text = appdstr(qp->q_text, lp, len);
else {
if ((qp->q_next = malloc(sizeof(QE))) == NULL)
errx(1, "malloc");
qp = qp->q_next;
if ((qp->q_text = malloc(len + 1)) == NULL)
errx(1, "malloc");
strncpy(qp->q_text, lp, len);
qp->q_text[len] = '\0';
qp->q_asked = qp->q_answered = FALSE;
qp->q_next = NULL;
++qsize;
}
}
(void)fclose(fp);
}
static void
show_index(void)
{
QE *qp;
const char *p, *s;
FILE *pf;
const char *pager;
if (!isatty(1))
pager = "cat";
else {
if (!(pager = getenv("PAGER")) || (*pager == 0))
pager = _PATH_PAGER;
}
if ((pf = popen(pager, "w")) == NULL)
err(1, "%s", pager);
(void)fprintf(pf, "Subjects:\n\n");
for (qp = qlist.q_next; qp; qp = qp->q_next) {
for (s = next_cat(qp->q_text); s; s = next_cat(s)) {
if (!rxp_compile(s))
errx(1, "%s", rxperr);
if ((p = rxp_expand()) != NULL)
(void)fprintf(pf, "%s ", p);
}
(void)fprintf(pf, "\n");
}
(void)fprintf(pf, "\n%s\n%s\n%s\n",
"For example, \"quiz victim killer\" prints a victim's name and you reply",
"with the killer, and \"quiz killer victim\" works the other way around.",
"Type an empty line to get the correct answer.");
(void)pclose(pf);
}
static void
get_cats(char *cat1, char *cat2)
{
QE *qp;
int i;
const char *s;
downcase(cat1);
downcase(cat2);
for (qp = qlist.q_next; qp; qp = qp->q_next) {
s = next_cat(qp->q_text);
catone = cattwo = i = 0;
while (s) {
if (!rxp_compile(s))
errx(1, "%s", rxperr);
i++;
if (rxp_match(cat1))
catone = i;
if (rxp_match(cat2))
cattwo = i;
s = next_cat(s);
}
if (catone && cattwo && catone != cattwo) {
if (!rxp_compile(qp->q_text))
errx(1, "%s", rxperr);
get_file(rxp_expand());
return;
}
}
errx(1, "invalid categories");
}
static void
quiz(void)
{
QE *qp;
int i;
size_t len;
unsigned guesses, rights, wrongs;
unsigned next, j;
char *answer, *t, question[LINE_SZ];
const char *s;
srandom(time(NULL));
guesses = rights = wrongs = 0;
for (;;) {
if (qsize == 0)
break;
next = random() % qsize;
qp = qlist.q_next;
for (j = 0; j < next; j++)
qp = qp->q_next;
while (qp && qp->q_answered)
qp = qp->q_next;
if (!qp) {
qsize = next;
continue;
}
if (tflag && random() % 100 > 20) {
/* repeat questions in tutorial mode */
while (qp && (!qp->q_asked || qp->q_answered))
qp = qp->q_next;
if (!qp)
continue;
}
s = qp->q_text;
for (i = 0; i < catone - 1; i++)
s = next_cat(s);
if (!rxp_compile(s))
errx(1, "%s", rxperr);
t = rxp_expand();
if (!t || *t == '\0') {
qp->q_answered = TRUE;
continue;
}
(void)strcpy(question, t);
s = qp->q_text;
for (i = 0; i < cattwo - 1; i++)
s = next_cat(s);
if (!rxp_compile(s))
errx(1, "%s", rxperr);
t = rxp_expand();
if (!t || *t == '\0') {
qp->q_answered = TRUE;
continue;
}
qp->q_asked = TRUE;
(void)printf("%s?\n", question);
for (;; ++guesses) {
if ((answer = fgetln(stdin, &len)) == NULL ||
answer[len - 1] != '\n') {
score(rights, wrongs, guesses);
exit(0);
}
answer[len - 1] = '\0';
downcase(answer);
if (rxp_match(answer)) {
(void)printf("Right!\n");
++rights;
qp->q_answered = TRUE;
break;
}
if (*answer == '\0') {
(void)printf("%s\n", t);
++wrongs;
if (!tflag)
qp->q_answered = TRUE;
break;
}
(void)printf("What?\n");
}
}
score(rights, wrongs, guesses);
}
static const char *
next_cat(const char *s)
{
int esc;
esc = 0;
for (;;)
switch (*s++) {
case '\0':
return (NULL);
case '\\':
esc = 1;
break;
case ':':
if (!esc)
return (s);
default:
esc = 0;
break;
}
/* NOTREACHED */
}
static char *
appdstr(char *s, const char *tp, size_t len)
{
char *mp;
const char *sp;
int ch;
char *m;
if ((m = malloc(strlen(s) + len + 1)) == NULL)
errx(1, "malloc");
for (mp = m, sp = s; (*mp++ = *sp++) != '\0'; )
;
--mp;
if (*(mp - 1) == '\\')
--mp;
while ((ch = *mp++ = *tp++) && ch != '\n')
;
*mp = '\0';
free(s);
return (m);
}
static void
score(unsigned r, unsigned w, unsigned g)
{
(void)printf("Rights %d, wrongs %d,", r, w);
if (g)
(void)printf(" extra guesses %d,", g);
(void)printf(" score %d%%\n", (r + w + g) ? r * 100 / (r + w + g) : 0);
}
static void
downcase(char *p)
{
int ch;
for (; (ch = *p) != '\0'; ++p)
if (isascii(ch) && isupper(ch))
*p = tolower(ch);
}
static void
usage(void)
{
(void)fprintf(stderr, "quiz [-t] [-i file] category1 category2\n");
exit(1);
}
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