games/quiz/quiz.c

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Jim R. Oldroyd at The Instruction Set and Keith Gabryelski at
   7  * Commodore Business Machines.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1991, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)quiz.c   8.3 (Berkeley) 5/4/95
  35  * $FreeBSD: src/games/quiz/quiz.c,v 1.12 1999/12/12 02:29:54 billf Exp $
  36  */
  37
  38 #include <sys/types.h>
  39
  40 #include <ctype.h>
  41 #include <errno.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <time.h>
  46 #include <unistd.h>
  47
  48 #include "quiz.h"
  49 #include "pathnames.h"
  50
  51 static QE qlist;
  52 static int catone, cattwo, tflag;
  53 static u_int qsize;
  54
  55 char    *appdstr (char *, char *, size_t);
  56 void     downcase (char *);
  57 void     err (const char *, ...) __printflike(1, 2) __dead2;
  58 void     get_cats (char *, char *);
  59 void     get_file (const char *);
  60 char    *next_cat (char *);
  61 void     quiz (void);
  62 void     score (u_int, u_int, u_int);
  63 void     show_index (void);
  64 void     usage (void) __dead2;
  65
  66 int
  67 main(int argc, char **argv)
  68 {
  69         int ch;
  70         const char *indexfile;
  71
  72         /* revoke */
  73         setgid(getgid());
  74
  75         indexfile = _PATH_QUIZIDX;
  76         while ((ch = getopt(argc, argv, "i:t")) != -1)
  77                 switch(ch) {
  78                 case 'i':
  79                         indexfile = optarg;
  80                         break;
  81                 case 't':
  82                         tflag = 1;
  83                         break;
  84                 case '?':
  85                 default:
  86                         usage();
  87                 }
  88         argc -= optind;
  89         argv += optind;
  90
  91         switch(argc) {
  92         case 0:
  93                 get_file(indexfile);
  94                 show_index();
  95                 break;
  96         case 2:
  97                 get_file(indexfile);
  98                 get_cats(argv[0], argv[1]);
  99                 quiz();
 100                 break;
 101         default:
 102                 usage();
 103         }
 104         exit(0);
 105 }
 106
 107 void
 108 get_file(const char *file)
 109 {
 110         FILE *fp;
 111         QE *qp;
 112         size_t len;
 113         char *lp;
 114
 115         if ((fp = fopen(file, "r")) == NULL)
 116                 err("%s: %s", file, strerror(errno));
 117
 118         /*
 119          * XXX
 120          * Should really free up space from any earlier read list
 121          * but there are no reverse pointers to do so with.
 122          */
 123         qp = &qlist;
 124         qsize = 0;
 125         while ((lp = fgetln(fp, &len)) != NULL) {
 126                 if (qp->q_text && qp->q_text[strlen(qp->q_text) - 1] == '\\')
 127                         qp->q_text = appdstr(qp->q_text, lp, len);
 128                 else {
 129                         if ((qp->q_next = malloc(sizeof(QE))) == NULL)
 130                                 err("%s", strerror(errno));
 131                         qp = qp->q_next;
 132                         lp[len - 1] = '\0';
 133                         if ((qp->q_text = strdup(lp)) == NULL)
 134                                 err("%s", strerror(errno));
 135                         qp->q_asked = qp->q_answered = FALSE;
 136                         qp->q_next = NULL;
 137                         ++qsize;
 138                 }
 139         }
 140         fclose(fp);
 141 }
 142
 143 void
 144 show_index(void)
 145 {
 146         QE *qp;
 147         char *p, *s;
 148         FILE *pf;
 149
 150         if ((pf = popen(_PATH_PAGER, "w")) == NULL)
 151                 err("%s: %s", _PATH_PAGER, strerror(errno));
 152         fprintf(pf, "Subjects:\n\n");
 153         for (qp = qlist.q_next; qp; qp = qp->q_next) {
 154                 for (s = next_cat(qp->q_text); s; s = next_cat(s)) {
 155                         if (!rxp_compile(s))
 156                                 err("%s", rxperr);
 157                         if ((p = rxp_expand()) != '\0')
 158                                 fprintf(pf, "%s ", p);
 159                 }
 160                 fprintf(pf, "\n");
 161         }
 162         fprintf(pf, "\n%s\n%s\n%s\n",
 163 "For example, \"quiz victim killer\" prints a victim's name and you reply",
 164 "with the killer, and \"quiz killer victim\" works the other way around.",
 165 "Type an empty line to get the correct answer.");
 166         pclose(pf);
 167 }
 168
 169 void
 170 get_cats(char *cat1, char *cat2)
 171 {
 172         QE *qp;
 173         int i;
 174         char *s;
 175
 176         downcase(cat1);
 177         downcase(cat2);
 178         for (qp = qlist.q_next; qp; qp = qp->q_next) {
 179                 s = next_cat(qp->q_text);
 180                 catone = cattwo = i = 0;
 181                 while (s) {
 182                         if (!rxp_compile(s))
 183                                 err("%s", rxperr);
 184                         i++;
 185                         if (rxp_match(cat1))
 186                                 catone = i;
 187                         if (rxp_match(cat2))
 188                                 cattwo = i;
 189                         s = next_cat(s);
 190                 }
 191                 if (catone && cattwo && catone != cattwo) {
 192                         if (!rxp_compile(qp->q_text))
 193                                 err("%s", rxperr);
 194                         get_file(rxp_expand());
 195                         return;
 196                 }
 197         }
 198         err("invalid categories");
 199 }
 200
 201 void
 202 quiz(void)
 203 {
 204         QE *qp;
 205         int i;
 206         size_t len;
 207         u_int guesses, rights, wrongs;
 208         int next;
 209         char *answer, *s, *t, question[LINE_SZ];
 210
 211         srandomdev();
 212         guesses = rights = wrongs = 0;
 213         for (;;) {
 214                 if (qsize == 0)
 215                         break;
 216                 next = random() % qsize;
 217                 qp = qlist.q_next;
 218                 for (i = 0; i < next; i++)
 219                         qp = qp->q_next;
 220                 while (qp && qp->q_answered)
 221                         qp = qp->q_next;
 222                 if (!qp) {
 223                         qsize = next;
 224                         continue;
 225                 }
 226                 if (tflag && random() % 100 > 20) {
 227                         /* repeat questions in tutorial mode */
 228                         while (qp && (!qp->q_asked || qp->q_answered))
 229                                 qp = qp->q_next;
 230                         if (!qp)
 231                                 continue;
 232                 }
 233                 s = qp->q_text;
 234                 for (i = 0; i < catone - 1; i++)
 235                         s = next_cat(s);
 236                 if (!rxp_compile(s))
 237                         err("%s", rxperr);
 238                 t = rxp_expand();
 239                 if (!t || *t == '\0') {
 240                         qp->q_answered = TRUE;
 241                         continue;
 242                 }
 243                 strcpy(question, t);
 244                 s = qp->q_text;
 245                 for (i = 0; i < cattwo - 1; i++)
 246                         s = next_cat(s);
 247                 if (!rxp_compile(s))
 248                         err("%s", rxperr);
 249                 t = rxp_expand();
 250                 if (!t || *t == '\0') {
 251                         qp->q_answered = TRUE;
 252                         continue;
 253                 }
 254                 qp->q_asked = TRUE;
 255                 printf("%s?\n", question);
 256                 for (;; ++guesses) {
 257                         if ((answer = fgetln(stdin, &len)) == NULL) {
 258                                 score(rights, wrongs, guesses);
 259                                 exit(0);
 260                         }
 261                         answer[len - 1] = '\0';
 262                         downcase(answer);
 263                         if (rxp_match(answer)) {
 264                                 printf("Right!\n");
 265                                 ++rights;
 266                                 qp->q_answered = TRUE;
 267                                 break;
 268                         }
 269                         if (*answer == '\0') {
 270                                 printf("%s\n", t);
 271                                 ++wrongs;
 272                                 if (!tflag)
 273                                         qp->q_answered = TRUE;
 274                                 break;
 275                         }
 276                         printf("What?\n");
 277                 }
 278         }
 279         score(rights, wrongs, guesses);
 280 }
 281
 282 char *
 283 next_cat(char *s)
 284 {
 285         for (;;)
 286                 switch (*s++) {
 287                 case '\0':
 288                         return (NULL);
 289                 case '\\':
 290                         s++;
 291                         break;
 292                 case ':':
 293                         return (s);
 294                 }
 295         /* NOTREACHED */
 296 }
 297
 298 char *
 299 appdstr(char *s, char *tp, size_t len)
 300 {
 301         char *mp, *sp;
 302         char *m;
 303
 304         if ((m = malloc(strlen(s) + len + 1)) == NULL)
 305                 err("%s", strerror(errno));
 306         mp = m;
 307         sp = s;
 308         for (; (*mp++ = *sp++););
 309         mp--;
 310
 311         if (*(mp - 1) == '\\')
 312                 --mp;
 313         memcpy(mp, tp, len);
 314         mp[len] = '\0';
 315         if (mp[len - 1] == '\n')
 316                 mp[len - 1] = '\0';
 317
 318         free(s);
 319         return (m);
 320 }
 321
 322 void
 323 score(u_int r, u_int w, u_int g)
 324 {
 325         printf("Rights %d, wrongs %d,", r, w);
 326         if (g)
 327                 printf(" extra guesses %d,", g);
 328         printf(" score %d%%\n", (r + w + g) ? r * 100 / (r + w + g) : 0);
 329 }
 330
 331 void
 332 downcase(char *p)
 333 {
 334         int ch;
 335
 336         for (; (ch = *p); ++p)
 337                 if (isascii(ch) && isupper(ch))
 338                         *p = tolower(ch);
 339 }
 340
 341 void
 342 usage(void)
 343 {
 344         fprintf(stderr, "quiz [-t] [-i file] category1 category2\n");
 345         exit(1);
 346 }
 347
 348 #include <stdarg.h>
 349
 350 void
 351 err(const char *fmt, ...)
 352 {
 353         va_list ap;
 354         va_start(ap, fmt);
 355         fprintf(stderr, "quiz: ");
 356         vfprintf(stderr, fmt, ap);
 357         va_end(ap);
 358         fprintf(stderr, "\n");
 359         exit(1);
 360 }