quiz/quiz.c

   1 /*-
   2  * Copyright (c) 1991 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Jim R. Oldroyd at The Instruction Set.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #ifndef lint
  38 char copyright[] =
  39 "@(#) Copyright (c) 1991 The Regents of the University of California.\n\
  40  All rights reserved.\n";
  41 #endif /* not lint */
  42
  43 #ifndef lint
  44 static char sccsid[] = "@(#)quiz.c      5.1 (Berkeley) 11/10/91";
  45 #endif /* not lint */
  46
  47 #include <sys/types.h>
  48 #include <errno.h>
  49 #include <time.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <ctype.h>
  54 #include "quiz.h"
  55 #include "pathnames.h"
  56
  57 static QE qlist;
  58 static int catone, cattwo, tflag;
  59 static u_int qsize;
  60
  61 char    *appdstr __P((char *, char *));
  62 void     downcase __P((char *));
  63 void     err __P((const char *, ...));
  64 void     get_cats __P((char *, char *));
  65 void     get_file __P((char *));
  66 char    *next_cat __P((char *));
  67 void     quiz __P((void));
  68 void     score __P((u_int, u_int, u_int));
  69 void     show_index __P((void));
  70 void     usage __P((void));
  71
  72 int
  73 main(argc, argv)
  74         int argc;
  75         char *argv[];
  76 {
  77         register int ch;
  78         char *indexfile;
  79
  80         indexfile = _PATH_QUIZIDX;
  81         while ((ch = getopt(argc, argv, "i:t")) != EOF)
  82                 switch(ch) {
  83                 case 'i':
  84                         indexfile = optarg;
  85                         break;
  86                 case 't':
  87                         tflag = 1;
  88                         break;
  89                 case '?':
  90                 default:
  91                         usage();
  92                 }
  93         argc -= optind;
  94         argv += optind;
  95
  96         switch(argc) {
  97         case 0:
  98                 get_file(indexfile);
  99                 show_index();
 100                 break;
 101         case 2:
 102                 get_file(indexfile);
 103                 get_cats(argv[0], argv[1]);
 104                 quiz();
 105                 break;
 106         default:
 107                 usage();
 108         }
 109         exit(0);
 110 }
 111
 112 void
 113 get_file(file)
 114         char *file;
 115 {
 116         register FILE *fp;
 117         register QE *qp;
 118         size_t len;
 119         char *lp;
 120
 121         if ((fp = fopen(file, "r")) == NULL)
 122                 err("%s: %s", file, strerror(errno));
 123
 124         /*
 125          * XXX
 126          * Should really free up space from any earlier read list
 127          * but there are no reverse pointers to do so with.
 128          */
 129         qp = &qlist;
 130         qsize = 0;
 131         while ((lp = fgetline(fp, &len)) != NULL) {
 132                 if (qp->q_text && qp->q_text[strlen(qp->q_text) - 1] == '\\')
 133                         qp->q_text = appdstr(qp->q_text, lp);
 134                 else {
 135                         if ((qp->q_next = malloc(sizeof(QE))) == NULL)
 136                                 err("%s", strerror(errno));
 137                         qp = qp->q_next;
 138                         if ((qp->q_text = strdup(lp)) == NULL)
 139                                 err("%s", strerror(errno));
 140                         qp->q_asked = qp->q_answered = FALSE;
 141                         qp->q_next = NULL;
 142                         ++qsize;
 143                 }
 144         }
 145         (void)fclose(fp);
 146 }
 147
 148 void
 149 show_index()
 150 {
 151         register QE *qp;
 152         register char *p, *s;
 153         FILE *pf;
 154
 155         if ((pf = popen(_PATH_PAGER, "w")) == NULL)
 156                 err("%s: %s", _PATH_PAGER, strerror(errno));
 157         (void)fprintf(pf, "Subjects:\n\n");
 158         for (qp = qlist.q_next; qp; qp = qp->q_next) {
 159                 for (s = next_cat(qp->q_text); s; s = next_cat(s)) {
 160                         if (!rxp_compile(s))
 161                                 err("%s", rxperr);
 162                         if (p = rxp_expand())
 163                                 (void)fprintf(pf, "%s ", p);
 164                 }
 165                 (void)fprintf(pf, "\n");
 166         }
 167         (void)fprintf(pf, "\n%s\n%s\n%s\n",
 168 "For example, \"quiz victim killer\" prints a victim's name and you reply",
 169 "with the killer, and \"quiz killer victim\" works the other way around.",
 170 "Type an empty line to get the correct answer.");
 171         (void)pclose(pf);
 172 }
 173
 174 void
 175 get_cats(cat1, cat2)
 176         char *cat1, *cat2;
 177 {
 178         register QE *qp;
 179         int i;
 180         char *s;
 181
 182         downcase(cat1);
 183         downcase(cat2);
 184         for (qp = qlist.q_next; qp; qp = qp->q_next) {
 185                 s = next_cat(qp->q_text);
 186                 catone = cattwo = i = 0;
 187                 while (s) {
 188                         if (!rxp_compile(s))
 189                                 err("%s", rxperr);
 190                         i++;
 191                         if (rxp_match(cat1))
 192                                 catone = i;
 193                         if (rxp_match(cat2))
 194                                 cattwo = i;
 195                         s = next_cat(s);
 196                 }
 197                 if (catone && cattwo && catone != cattwo) {
 198                         if (!rxp_compile(qp->q_text))
 199                                 err("%s", rxperr);
 200                         get_file(rxp_expand());
 201                         return;
 202                 }
 203         }
 204         err("invalid categories");
 205 }
 206
 207 void
 208 quiz()
 209 {
 210         register QE *qp;
 211         register int i;
 212         u_int guesses, rights, wrongs;
 213         int next;
 214         char *s, *t, question[LINE_SZ];
 215         char *answer;
 216
 217         srandom(time(NULL));
 218         guesses = rights = wrongs = 0;
 219         for (;;) {
 220                 if (qsize == 0)
 221                         break;
 222                 next = random() % qsize;
 223                 qp = qlist.q_next;
 224                 for (i = 0; i < next; i++)
 225                         qp = qp->q_next;
 226                 while (qp && qp->q_answered)
 227                         qp = qp->q_next;
 228                 if (!qp) {
 229                         qsize = next;
 230                         continue;
 231                 }
 232                 if (tflag && random() % 100 > 20) {
 233                         /* repeat questions in tutorial mode */
 234                         while (qp && (!qp->q_asked || qp->q_answered))
 235                                 qp = qp->q_next;
 236                         if (!qp)
 237                                 continue;
 238                 }
 239                 s = qp->q_text;
 240                 for (i = 0; i < catone - 1; i++)
 241                         s = next_cat(s);
 242                 if (!rxp_compile(s))
 243                         err("%s", rxperr);
 244                 t = rxp_expand();
 245                 if (!t || *t == '\0') {
 246                         qp->q_answered = TRUE;
 247                         continue;
 248                 }
 249                 (void)strcpy(question, t);
 250                 s = qp->q_text;
 251                 for (i = 0; i < cattwo - 1; i++)
 252                         s = next_cat(s);
 253                 if (!rxp_compile(s))
 254                         err("%s", rxperr);
 255                 t = rxp_expand();
 256                 if (!t || *t == '\0') {
 257                         qp->q_answered = TRUE;
 258                         continue;
 259                 }
 260                 qp->q_asked = TRUE;
 261                 (void)printf("%s?\n", question);
 262                 for (;; ++guesses) {
 263                         if ((answer = fgetline(stdin, NULL)) == NULL) {
 264                                 score(rights, wrongs, guesses);
 265                                 exit(0);
 266                         }
 267                         downcase(answer);
 268                         if (rxp_match(answer)) {
 269                                 (void)printf("Right!\n");
 270                                 ++rights;
 271                                 qp->q_answered = TRUE;
 272                                 break;
 273                         }
 274                         if (*answer == '\0') {
 275                                 (void)printf("%s\n", t);
 276                                 ++wrongs;
 277                                 if (!tflag)
 278                                         qp->q_answered = TRUE;
 279                                 break;
 280                         }
 281                         (void)printf("What?\n");
 282                 }
 283         }
 284         score(rights, wrongs, guesses);
 285 }
 286
 287 char *
 288 next_cat(s)
 289         register char * s;
 290 {
 291         for (;;)
 292                 switch (*s++) {
 293                 case '\0':
 294                         return (NULL);
 295                 case '\\':
 296                         break;
 297                 case ':':
 298                         return (s);
 299                 }
 300         /* NOTREACHED */
 301 }
 302
 303 char *
 304 appdstr(s, tp)
 305         char *s;
 306         register char *tp;
 307 {
 308         register char *mp, *sp;
 309         register int ch;
 310         char *m;
 311
 312         if ((m = malloc(strlen(sp) + strlen(tp) + 1)) == NULL)
 313                 err("%s", strerror(errno));
 314         for (mp = m, sp = s; *mp++ = *sp++;);
 315
 316         if (*(mp - 1) == '\\')
 317                 --mp;
 318         while ((ch = *mp++ = *tp++) && ch != '\n');
 319         *mp = '\0';
 320
 321         free(s);
 322         return (m);
 323 }
 324
 325 void
 326 score(r, w, g)
 327         u_int r, w, g;
 328 {
 329         (void)printf("Rights %d, wrongs %d,", r, w);
 330         if (g)
 331                 (void)printf(" extra guesses %d,", g);
 332         (void)printf(" score %d%%\n", (r + w + g) ? r * 100 / (r + w + g) : 0);
 333 }
 334
 335 void
 336 downcase(p)
 337         register char *p;
 338 {
 339         register int ch;
 340
 341         for (; ch = *p; ++p)
 342                 if (isascii(ch) && isupper(ch))
 343                         *p = tolower(ch);
 344 }
 345
 346 void
 347 usage()
 348 {
 349         (void)fprintf(stderr, "quiz [-t] [-i file] category1 category2\n");
 350         exit(1);
 351 }
 352
 353 #if __STDC__
 354 #include <stdarg.h>
 355 #else
 356 #include <varargs.h>
 357 #endif
 358
 359 void
 360 #if __STDC__
 361 err(const char *fmt, ...)
 362 #else
 363 err(fmt, va_alist)
 364         char *fmt;
 365         va_dcl
 366 #endif
 367 {
 368         va_list ap;
 369 #if __STDC__
 370         va_start(ap, fmt);
 371 #else
 372         va_start(ap);
 373 #endif
 374         (void)fprintf(stderr, "quiz: ");
 375         (void)vfprintf(stderr, fmt, ap);
 376         va_end(ap);
 377         (void)fprintf(stderr, "\n");
 378         exit(1);
 379 }