quiz/quiz.c

   1 /*      $NetBSD: quiz.c,v 1.18 2000/05/08 07:56:05 mycroft Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1991, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Jim R. Oldroyd at The Instruction Set and Keith Gabryelski at
   9  * Commodore Business Machines.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  */
  39
  40 #include <sys/cdefs.h>
  41 #ifndef lint
  42 __COPYRIGHT("@(#) Copyright (c) 1991, 1993\n\
  43         The Regents of the University of California.  All rights reserved.\n");
  44 #endif /* not lint */
  45
  46 #ifndef lint
  47 #if 0
  48 static char sccsid[] = "@(#)quiz.c      8.3 (Berkeley) 5/4/95";
  49 #else
  50 __RCSID("$NetBSD: quiz.c,v 1.18 2000/05/08 07:56:05 mycroft Exp $");
  51 #endif
  52 #endif /* not lint */
  53
  54 #include <sys/types.h>
  55
  56 #include <ctype.h>
  57 #include <errno.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <ctype.h>
  62 #include <err.h>
  63 #include <time.h>
  64 #include <unistd.h>
  65 #include "quiz.h"
  66 #include "pathnames.h"
  67
  68 static QE qlist;
  69 static int catone, cattwo, tflag;
  70 static u_int qsize;
  71
  72 char    *appdstr __P((char *, const char *, size_t));
  73 void     downcase __P((char *));
  74 void     get_cats __P((char *, char *));
  75 void     get_file __P((const char *));
  76 int      main __P((int, char *[]));
  77 const char      *next_cat __P((const char *));
  78 void     quiz __P((void));
  79 void     score __P((u_int, u_int, u_int));
  80 void     show_index __P((void));
  81 void     usage __P((void)) __attribute__((__noreturn__));
  82
  83 int
  84 main(argc, argv)
  85         int argc;
  86         char *argv[];
  87 {
  88         int ch;
  89         const char *indexfile;
  90
  91         /* Revoke setgid privileges */
  92         setgid(getgid());
  93
  94         indexfile = _PATH_QUIZIDX;
  95         while ((ch = getopt(argc, argv, "i:t")) != -1)
  96                 switch(ch) {
  97                 case 'i':
  98                         indexfile = optarg;
  99                         break;
 100                 case 't':
 101                         tflag = 1;
 102                         break;
 103                 case '?':
 104                 default:
 105                         usage();
 106                 }
 107         argc -= optind;
 108         argv += optind;
 109
 110         switch(argc) {
 111         case 0:
 112                 get_file(indexfile);
 113                 show_index();
 114                 break;
 115         case 2:
 116                 get_file(indexfile);
 117                 get_cats(argv[0], argv[1]);
 118                 quiz();
 119                 break;
 120         default:
 121                 usage();
 122         }
 123         exit(0);
 124 }
 125
 126 void
 127 get_file(file)
 128         const char *file;
 129 {
 130         FILE *fp;
 131         QE *qp;
 132         size_t len;
 133         char *lp;
 134
 135         if ((fp = fopen(file, "r")) == NULL)
 136                 err(1, "%s", file);
 137
 138         /*
 139          * XXX
 140          * Should really free up space from any earlier read list
 141          * but there are no reverse pointers to do so with.
 142          */
 143         qp = &qlist;
 144         qsize = 0;
 145         while ((lp = fgetln(fp, &len)) != NULL) {
 146                 if (lp[len - 1] == '\n')
 147                         lp[--len] = '\0';
 148                 if (qp->q_text && qp->q_text[strlen(qp->q_text) - 1] == '\\')
 149                         qp->q_text = appdstr(qp->q_text, lp, len);
 150                 else {
 151                         if ((qp->q_next = malloc(sizeof(QE))) == NULL)
 152                                 errx(1, "malloc");
 153                         qp = qp->q_next;
 154                         if ((qp->q_text = malloc(len + 1)) == NULL)
 155                                 errx(1, "malloc");
 156                         strncpy(qp->q_text, lp, len);
 157                         qp->q_text[len] = '\0';
 158                         qp->q_asked = qp->q_answered = FALSE;
 159                         qp->q_next = NULL;
 160                         ++qsize;
 161                 }
 162         }
 163         (void)fclose(fp);
 164 }
 165
 166 void
 167 show_index()
 168 {
 169         QE *qp;
 170         const char *p, *s;
 171         FILE *pf;
 172         const char *pager;
 173
 174         if (!isatty(1))
 175                 pager = "cat";
 176         else {
 177                 if (!(pager = getenv("PAGER")) || (*pager == 0))
 178                         pager = _PATH_PAGER;
 179         }
 180         if ((pf = popen(pager, "w")) == NULL)
 181                 err(1, "%s", pager);
 182         (void)fprintf(pf, "Subjects:\n\n");
 183         for (qp = qlist.q_next; qp; qp = qp->q_next) {
 184                 for (s = next_cat(qp->q_text); s; s = next_cat(s)) {
 185                         if (!rxp_compile(s))
 186                                 errx(1, "%s", rxperr);
 187                         if ((p = rxp_expand()) != NULL)
 188                                 (void)fprintf(pf, "%s ", p);
 189                 }
 190                 (void)fprintf(pf, "\n");
 191         }
 192         (void)fprintf(pf, "\n%s\n%s\n%s\n",
 193 "For example, \"quiz victim killer\" prints a victim's name and you reply",
 194 "with the killer, and \"quiz killer victim\" works the other way around.",
 195 "Type an empty line to get the correct answer.");
 196         (void)pclose(pf);
 197 }
 198
 199 void
 200 get_cats(cat1, cat2)
 201         char *cat1, *cat2;
 202 {
 203         QE *qp;
 204         int i;
 205         const char *s;
 206
 207         downcase(cat1);
 208         downcase(cat2);
 209         for (qp = qlist.q_next; qp; qp = qp->q_next) {
 210                 s = next_cat(qp->q_text);
 211                 catone = cattwo = i = 0;
 212                 while (s) {
 213                         if (!rxp_compile(s))
 214                                 errx(1, "%s", rxperr);
 215                         i++;
 216                         if (rxp_match(cat1))
 217                                 catone = i;
 218                         if (rxp_match(cat2))
 219                                 cattwo = i;
 220                         s = next_cat(s);
 221                 }
 222                 if (catone && cattwo && catone != cattwo) {
 223                         if (!rxp_compile(qp->q_text))
 224                                 errx(1, "%s", rxperr);
 225                         get_file(rxp_expand());
 226                         return;
 227                 }
 228         }
 229         errx(1, "invalid categories");
 230 }
 231
 232 void
 233 quiz()
 234 {
 235         QE *qp;
 236         int i;
 237         size_t len;
 238         u_int guesses, rights, wrongs;
 239         int next;
 240         char *answer, *t, question[LINE_SZ];
 241         const char *s;
 242
 243         srandom(time(NULL));
 244         guesses = rights = wrongs = 0;
 245         for (;;) {
 246                 if (qsize == 0)
 247                         break;
 248                 next = random() % qsize;
 249                 qp = qlist.q_next;
 250                 for (i = 0; i < next; i++)
 251                         qp = qp->q_next;
 252                 while (qp && qp->q_answered)
 253                         qp = qp->q_next;
 254                 if (!qp) {
 255                         qsize = next;
 256                         continue;
 257                 }
 258                 if (tflag && random() % 100 > 20) {
 259                         /* repeat questions in tutorial mode */
 260                         while (qp && (!qp->q_asked || qp->q_answered))
 261                                 qp = qp->q_next;
 262                         if (!qp)
 263                                 continue;
 264                 }
 265                 s = qp->q_text;
 266                 for (i = 0; i < catone - 1; i++)
 267                         s = next_cat(s);
 268                 if (!rxp_compile(s))
 269                         errx(1, "%s", rxperr);
 270                 t = rxp_expand();
 271                 if (!t || *t == '\0') {
 272                         qp->q_answered = TRUE;
 273                         continue;
 274                 }
 275                 (void)strcpy(question, t);
 276                 s = qp->q_text;
 277                 for (i = 0; i < cattwo - 1; i++)
 278                         s = next_cat(s);
 279                 if (!rxp_compile(s))
 280                         errx(1, "%s", rxperr);
 281                 t = rxp_expand();
 282                 if (!t || *t == '\0') {
 283                         qp->q_answered = TRUE;
 284                         continue;
 285                 }
 286                 qp->q_asked = TRUE;
 287                 (void)printf("%s?\n", question);
 288                 for (;; ++guesses) {
 289                         if ((answer = fgetln(stdin, &len)) == NULL ||
 290                             answer[len - 1] != '\n') {
 291                                 score(rights, wrongs, guesses);
 292                                 exit(0);
 293                         }
 294                         answer[len - 1] = '\0';
 295                         downcase(answer);
 296                         if (rxp_match(answer)) {
 297                                 (void)printf("Right!\n");
 298                                 ++rights;
 299                                 qp->q_answered = TRUE;
 300                                 break;
 301                         }
 302                         if (*answer == '\0') {
 303                                 (void)printf("%s\n", t);
 304                                 ++wrongs;
 305                                 if (!tflag)
 306                                         qp->q_answered = TRUE;
 307                                 break;
 308                         }
 309                         (void)printf("What?\n");
 310                 }
 311         }
 312         score(rights, wrongs, guesses);
 313 }
 314
 315 const char *
 316 next_cat(s)
 317         const char *    s;
 318 {
 319         int esc;
 320
 321         esc = 0;
 322         for (;;)
 323                 switch (*s++) {
 324                 case '\0':
 325                         return (NULL);
 326                 case '\\':
 327                         esc = 1;
 328                         break;
 329                 case ':':
 330                         if (!esc)
 331                                 return (s);
 332                 default:
 333                         esc = 0;
 334                         break;
 335                 }
 336         /* NOTREACHED */
 337 }
 338
 339 char *
 340 appdstr(s, tp, len)
 341         char *s;
 342         const char *tp;
 343         size_t len;
 344 {
 345         char *mp;
 346         const char *sp;
 347         int ch;
 348         char *m;
 349
 350         if ((m = malloc(strlen(s) + len + 1)) == NULL)
 351                 errx(1, "malloc");
 352         for (mp = m, sp = s; (*mp++ = *sp++) != '\0'; )
 353                 ;
 354         --mp;
 355         if (*(mp - 1) == '\\')
 356                 --mp;
 357
 358         while ((ch = *mp++ = *tp++) && ch != '\n')
 359                 ;
 360         *mp = '\0';
 361
 362         free(s);
 363         return (m);
 364 }
 365
 366 void
 367 score(r, w, g)
 368         u_int r, w, g;
 369 {
 370         (void)printf("Rights %d, wrongs %d,", r, w);
 371         if (g)
 372                 (void)printf(" extra guesses %d,", g);
 373         (void)printf(" score %d%%\n", (r + w + g) ? r * 100 / (r + w + g) : 0);
 374 }
 375
 376 void
 377 downcase(p)
 378         char *p;
 379 {
 380         int ch;
 381
 382         for (; (ch = *p) != '\0'; ++p)
 383                 if (isascii(ch) && isupper(ch))
 384                         *p = tolower(ch);
 385 }
 386
 387 void
 388 usage()
 389 {
 390         (void)fprintf(stderr, "quiz [-t] [-i file] category1 category2\n");
 391         exit(1);
 392 }