395 lines
8.3 KiB
C
395 lines
8.3 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jim R. Oldroyd at The Instruction Set and Keith Gabryelski at
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* Commodore Business Machines.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1991, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)quiz.c 8.3 (Berkeley) 5/4/95";
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#endif /* not lint */
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#include <sys/types.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "quiz.h"
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#include "pathnames.h"
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static QE qlist;
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static int catone, cattwo, tflag;
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static u_int qsize;
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char *appdstr __P((char *, char *, size_t));
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void downcase __P((char *));
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void err __P((const char *, ...));
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void get_cats __P((char *, char *));
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void get_file __P((char *));
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char *next_cat __P((char *));
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void quiz __P((void));
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void score __P((u_int, u_int, u_int));
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void show_index __P((void));
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void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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register int ch;
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char *indexfile;
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/* revoke */
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setegid(getgid());
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setgid(getgid());
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indexfile = _PATH_QUIZIDX;
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while ((ch = getopt(argc, argv, "i:t")) != EOF)
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switch(ch) {
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case 'i':
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indexfile = optarg;
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break;
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case 't':
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tflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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switch(argc) {
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case 0:
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get_file(indexfile);
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show_index();
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break;
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case 2:
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get_file(indexfile);
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get_cats(argv[0], argv[1]);
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quiz();
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break;
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default:
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usage();
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}
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exit(0);
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}
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void
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get_file(file)
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char *file;
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{
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register FILE *fp;
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register QE *qp;
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size_t len;
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char *lp;
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if ((fp = fopen(file, "r")) == NULL)
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err("%s: %s", file, strerror(errno));
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/*
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* XXX
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* Should really free up space from any earlier read list
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* but there are no reverse pointers to do so with.
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*/
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qp = &qlist;
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qsize = 0;
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while ((lp = fgetln(fp, &len)) != NULL) {
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if (qp->q_text && qp->q_text[strlen(qp->q_text) - 1] == '\\')
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qp->q_text = appdstr(qp->q_text, lp, len);
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else {
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if ((qp->q_next = malloc(sizeof(QE))) == NULL)
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err("%s", strerror(errno));
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qp = qp->q_next;
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lp[len - 1] = '\0';
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if ((qp->q_text = strdup(lp)) == NULL)
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err("%s", strerror(errno));
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qp->q_asked = qp->q_answered = FALSE;
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qp->q_next = NULL;
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++qsize;
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}
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}
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(void)fclose(fp);
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}
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void
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show_index()
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{
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register QE *qp;
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register char *p, *s;
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FILE *pf;
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if ((pf = popen(_PATH_PAGER, "w")) == NULL)
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err("%s: %s", _PATH_PAGER, strerror(errno));
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(void)fprintf(pf, "Subjects:\n\n");
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for (qp = qlist.q_next; qp; qp = qp->q_next) {
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for (s = next_cat(qp->q_text); s; s = next_cat(s)) {
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if (!rxp_compile(s))
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err("%s", rxperr);
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if (p = rxp_expand())
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(void)fprintf(pf, "%s ", p);
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}
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(void)fprintf(pf, "\n");
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}
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(void)fprintf(pf, "\n%s\n%s\n%s\n",
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"For example, \"quiz victim killer\" prints a victim's name and you reply",
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"with the killer, and \"quiz killer victim\" works the other way around.",
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"Type an empty line to get the correct answer.");
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(void)pclose(pf);
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}
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void
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get_cats(cat1, cat2)
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char *cat1, *cat2;
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{
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register QE *qp;
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int i;
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char *s;
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downcase(cat1);
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downcase(cat2);
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for (qp = qlist.q_next; qp; qp = qp->q_next) {
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s = next_cat(qp->q_text);
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catone = cattwo = i = 0;
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while (s) {
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if (!rxp_compile(s))
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err("%s", rxperr);
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i++;
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if (rxp_match(cat1))
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catone = i;
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if (rxp_match(cat2))
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cattwo = i;
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s = next_cat(s);
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}
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if (catone && cattwo && catone != cattwo) {
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if (!rxp_compile(qp->q_text))
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err("%s", rxperr);
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get_file(rxp_expand());
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return;
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}
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}
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err("invalid categories");
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}
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void
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quiz()
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{
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register QE *qp;
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register int i;
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size_t len;
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u_int guesses, rights, wrongs;
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int next;
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char *answer, *s, *t, question[LINE_SZ];
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srandom(time(NULL));
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guesses = rights = wrongs = 0;
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for (;;) {
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if (qsize == 0)
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break;
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next = random() % qsize;
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qp = qlist.q_next;
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for (i = 0; i < next; i++)
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qp = qp->q_next;
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while (qp && qp->q_answered)
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qp = qp->q_next;
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if (!qp) {
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qsize = next;
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continue;
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}
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if (tflag && random() % 100 > 20) {
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/* repeat questions in tutorial mode */
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while (qp && (!qp->q_asked || qp->q_answered))
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qp = qp->q_next;
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if (!qp)
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continue;
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}
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s = qp->q_text;
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for (i = 0; i < catone - 1; i++)
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s = next_cat(s);
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if (!rxp_compile(s))
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err("%s", rxperr);
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t = rxp_expand();
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if (!t || *t == '\0') {
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qp->q_answered = TRUE;
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continue;
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}
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(void)strcpy(question, t);
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s = qp->q_text;
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for (i = 0; i < cattwo - 1; i++)
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s = next_cat(s);
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if (!rxp_compile(s))
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err("%s", rxperr);
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t = rxp_expand();
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if (!t || *t == '\0') {
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qp->q_answered = TRUE;
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continue;
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}
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qp->q_asked = TRUE;
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(void)printf("%s?\n", question);
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for (;; ++guesses) {
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if ((answer = fgetln(stdin, &len)) == NULL) {
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score(rights, wrongs, guesses);
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exit(0);
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}
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answer[len - 1] = '\0';
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downcase(answer);
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if (rxp_match(answer)) {
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(void)printf("Right!\n");
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++rights;
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qp->q_answered = TRUE;
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break;
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}
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if (*answer == '\0') {
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(void)printf("%s\n", t);
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++wrongs;
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if (!tflag)
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qp->q_answered = TRUE;
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break;
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}
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(void)printf("What?\n");
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}
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}
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score(rights, wrongs, guesses);
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}
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char *
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next_cat(s)
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register char * s;
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{
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for (;;)
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switch (*s++) {
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case '\0':
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return (NULL);
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case '\\':
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s++;
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break;
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case ':':
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return (s);
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}
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/* NOTREACHED */
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}
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char *
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appdstr(s, tp, len)
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char *s;
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register char *tp;
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size_t len;
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{
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register char *mp, *sp;
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register int ch;
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char *m;
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if ((m = malloc(strlen(s) + len + 1)) == NULL)
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err("%s", strerror(errno));
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for (mp = m, sp = s; *mp++ = *sp++;);
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mp--;
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if (*(mp - 1) == '\\')
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--mp;
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memcpy(mp, tp, len);
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mp[len] = '\0';
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if (mp[len - 1] == '\n')
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mp[len - 1] = '\0';
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free(s);
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return (m);
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}
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void
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score(r, w, g)
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u_int r, w, g;
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{
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(void)printf("Rights %d, wrongs %d,", r, w);
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if (g)
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(void)printf(" extra guesses %d,", g);
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(void)printf(" score %d%%\n", (r + w + g) ? r * 100 / (r + w + g) : 0);
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}
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void
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downcase(p)
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register char *p;
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{
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register int ch;
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for (; ch = *p; ++p)
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if (isascii(ch) && isupper(ch))
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*p = tolower(ch);
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}
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void
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usage()
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{
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(void)fprintf(stderr, "quiz [-t] [-i file] category1 category2\n");
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exit(1);
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}
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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void
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#if __STDC__
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err(const char *fmt, ...)
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#else
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err(fmt, va_alist)
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char *fmt;
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va_dcl
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#endif
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{
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va_list ap;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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(void)fprintf(stderr, "quiz: ");
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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(void)fprintf(stderr, "\n");
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exit(1);
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}
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