added quiz from net-2

1 files changed, 379 insertions, 0 deletions

diff --git a/quiz/quiz.c b/quiz/quiz.c
new file mode 100644
index 00000000..e3f59021
--- /dev/null
+++ b/quiz/quiz.c
@@ -0,0 +1,379 @@
+/*-
+ * Copyright (c) 1991 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.
+ *
+ * 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
+char copyright[] =
+"@(#) Copyright (c) 1991 The Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)quiz.c	5.1 (Berkeley) 11/10/91";
+#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 *));
+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);
+		else {
+			if ((qp->q_next = malloc(sizeof(QE))) == NULL)
+				err("%s", strerror(errno));
+			qp = qp->q_next;
+			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;
+	u_int guesses, rights, wrongs;
+	int next;
+	char *s, *t, question[LINE_SZ];
+	char *answer;
+
+	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, NULL)) == NULL) {
+				score(rights, wrongs, guesses);
+				exit(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)
+	char *s;
+	register char *tp;
+{
+	register char *mp, *sp;
+	register int ch;
+	char *m;
+
+	if ((m = malloc(strlen(sp) + strlen(tp) + 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);
+}