BSD 4_4_Lite1 release

[unix-history] / 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      8.2 (Berkeley) 1/3/94";
#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 = fgetln(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 = fgetln(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);
}