4.4BSD/usr/src/games/quiz/quiz.c
/*-
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1991, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)quiz.c 8.1 (Berkeley) 5/31/93";
#endif /* not lint */
#include <sys/types.h>
#include <errno.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "quiz.h"
#include "pathnames.h"
static QE qlist;
static int catone, cattwo, tflag;
static u_int qsize;
char *appdstr __P((char *, char *, size_t));
void downcase __P((char *));
void err __P((const char *, ...));
void get_cats __P((char *, char *));
void get_file __P((char *));
char *next_cat __P((char *));
void quiz __P((void));
void score __P((u_int, u_int, u_int));
void show_index __P((void));
void usage __P((void));
int
main(argc, argv)
int argc;
char *argv[];
{
register int ch;
char *indexfile;
indexfile = _PATH_QUIZIDX;
while ((ch = getopt(argc, argv, "i:t")) != EOF)
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);
}
void
get_file(file)
char *file;
{
register FILE *fp;
register QE *qp;
size_t len;
char *lp;
if ((fp = fopen(file, "r")) == NULL)
err("%s: %s", file, strerror(errno));
/*
* 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 = fgetline(fp, &len)) != NULL) {
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)
err("%s", strerror(errno));
qp = qp->q_next;
lp[len - 1] = '\0';
if ((qp->q_text = strdup(lp)) == NULL)
err("%s", strerror(errno));
qp->q_asked = qp->q_answered = FALSE;
qp->q_next = NULL;
++qsize;
}
}
(void)fclose(fp);
}
void
show_index()
{
register QE *qp;
register char *p, *s;
FILE *pf;
if ((pf = popen(_PATH_PAGER, "w")) == NULL)
err("%s: %s", _PATH_PAGER, strerror(errno));
(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))
err("%s", rxperr);
if (p = rxp_expand())
(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);
}
void
get_cats(cat1, cat2)
char *cat1, *cat2;
{
register QE *qp;
int i;
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))
err("%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))
err("%s", rxperr);
get_file(rxp_expand());
return;
}
}
err("invalid categories");
}
void
quiz()
{
register QE *qp;
register int i;
size_t len;
u_int guesses, rights, wrongs;
int next;
char *answer, *s, *t, question[LINE_SZ];
srandom(time(NULL));
guesses = rights = wrongs = 0;
for (;;) {
if (qsize == 0)
break;
next = random() % qsize;
qp = qlist.q_next;
for (i = 0; i < next; i++)
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))
err("%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))
err("%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 = fgetline(stdin, &len)) == NULL) {
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);
}
char *
next_cat(s)
register char * s;
{
for (;;)
switch (*s++) {
case '\0':
return (NULL);
case '\\':
break;
case ':':
return (s);
}
/* NOTREACHED */
}
char *
appdstr(s, tp, len)
char *s;
register char *tp;
size_t len;
{
register char *mp, *sp;
register int ch;
char *m;
if ((m = malloc(strlen(s) + len + 1)) == NULL)
err("%s", strerror(errno));
for (mp = m, sp = s; *mp++ = *sp++;);
if (*(mp - 1) == '\\')
--mp;
while ((ch = *mp++ = *tp++) && ch != '\n');
*mp = '\0';
free(s);
return (m);
}
void
score(r, w, g)
u_int r, w, 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);
}
void
downcase(p)
register char *p;
{
register int ch;
for (; ch = *p; ++p)
if (isascii(ch) && isupper(ch))
*p = tolower(ch);
}
void
usage()
{
(void)fprintf(stderr, "quiz [-t] [-i file] category1 category2\n");
exit(1);
}
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
void
#if __STDC__
err(const char *fmt, ...)
#else
err(fmt, va_alist)
char *fmt;
va_dcl
#endif
{
va_list ap;
#if __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
(void)fprintf(stderr, "quiz: ");
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
(void)fprintf(stderr, "\n");
exit(1);
}