1 /* $OpenBSD: quiz.c,v 1.31 2021/03/11 21:18:25 naddy Exp $ */ 2 /* $NetBSD: quiz.c,v 1.9 1995/04/22 10:16:58 cgd Exp $ */ 3 4 /*- 5 * Copyright (c) 1991, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Jim R. Oldroyd at The Instruction Set and Keith Gabryelski at 10 * Commodore Business Machines. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. 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 #include <ctype.h> 38 #include <err.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #include "pathnames.h" 45 #include "quiz.h" 46 47 static QE qlist; 48 static int catone, cattwo, tflag; 49 static u_int qsize; 50 51 void downcase(char *); 52 void get_cats(char *, char *); 53 void get_file(const char *); 54 const char *next_cat(const char *); 55 void quiz(void); 56 void score(u_int, u_int, u_int); 57 void show_index(void); 58 __dead void usage(void); 59 60 int 61 main(int argc, char *argv[]) 62 { 63 int ch; 64 const char *indexfile; 65 66 if (pledge("stdio rpath proc exec", NULL) == -1) 67 err(1, "pledge"); 68 69 indexfile = _PATH_QUIZIDX; 70 while ((ch = getopt(argc, argv, "hi:t")) != -1) 71 switch(ch) { 72 case 'i': 73 indexfile = optarg; 74 break; 75 case 't': 76 tflag = 1; 77 break; 78 case 'h': 79 default: 80 usage(); 81 } 82 argc -= optind; 83 argv += optind; 84 85 switch(argc) { 86 case 0: 87 get_file(indexfile); 88 show_index(); 89 break; 90 case 2: 91 if (pledge("stdio rpath", NULL) == -1) 92 err(1, "pledge"); 93 get_file(indexfile); 94 get_cats(argv[0], argv[1]); 95 96 if (pledge("stdio", NULL) == -1) 97 err(1, "pledge"); 98 99 quiz(); 100 break; 101 default: 102 usage(); 103 } 104 return 0; 105 } 106 107 void 108 get_file(const char *file) 109 { 110 FILE *fp; 111 QE *qp; 112 ssize_t len; 113 size_t qlen, size; 114 char *lp; 115 116 if ((fp = fopen(file, "r")) == NULL) 117 err(1, "%s", file); 118 119 /* 120 * XXX 121 * Should really free up space from any earlier read list 122 * but there are no reverse pointers to do so with. 123 */ 124 qp = &qlist; 125 qsize = 0; 126 qlen = 0; 127 lp = NULL; 128 size = 0; 129 while ((len = getline(&lp, &size, fp)) != -1) { 130 if (lp[len - 1] == '\n') 131 lp[--len] = '\0'; 132 if (qp->q_text) 133 qlen = strlen(qp->q_text); 134 if (qlen > 0 && qp->q_text[qlen - 1] == '\\') { 135 qp->q_text[--qlen] = '\0'; 136 qlen += len; 137 qp->q_text = realloc(qp->q_text, qlen + 1); 138 if (qp->q_text == NULL) 139 errx(1, "realloc"); 140 strlcat(qp->q_text, lp, qlen + 1); 141 } else { 142 if ((qp->q_next = malloc(sizeof(QE))) == NULL) 143 errx(1, "malloc"); 144 qp = qp->q_next; 145 qp->q_text = strdup(lp); 146 if (qp->q_text == NULL) 147 errx(1, "strdup"); 148 qp->q_asked = qp->q_answered = FALSE; 149 qp->q_next = NULL; 150 ++qsize; 151 } 152 } 153 free(lp); 154 if (ferror(fp)) 155 err(1, "getline"); 156 (void)fclose(fp); 157 } 158 159 void 160 show_index(void) 161 { 162 QE *qp; 163 const char *p, *s; 164 FILE *pf; 165 const char *pager; 166 167 if (!isatty(1)) 168 pager = "/bin/cat"; 169 else if (!(pager = getenv("PAGER")) || (*pager == 0)) 170 pager = _PATH_PAGER; 171 if ((pf = popen(pager, "w")) == NULL) 172 err(1, "%s", pager); 173 (void)fprintf(pf, "Subjects:\n\n"); 174 for (qp = qlist.q_next; qp; qp = qp->q_next) { 175 for (s = next_cat(qp->q_text); s; s = next_cat(s)) { 176 if (!rxp_compile(s)) 177 errx(1, "%s", rxperr); 178 if ((p = rxp_expand())) 179 (void)fprintf(pf, "%s ", p); 180 } 181 (void)fprintf(pf, "\n"); 182 } 183 (void)fprintf(pf, "\n%s\n%s\n%s\n", 184 "For example, \"quiz victim killer\" prints a victim's name and you reply", 185 "with the killer, and \"quiz killer victim\" works the other way around.", 186 "Type an empty line to get the correct answer."); 187 (void)pclose(pf); 188 } 189 190 void 191 get_cats(char *cat1, char *cat2) 192 { 193 QE *qp; 194 int i; 195 const char *s; 196 197 downcase(cat1); 198 downcase(cat2); 199 for (qp = qlist.q_next; qp; qp = qp->q_next) { 200 s = next_cat(qp->q_text); 201 catone = cattwo = i = 0; 202 while (s) { 203 if (!rxp_compile(s)) 204 errx(1, "%s", rxperr); 205 i++; 206 if (rxp_match(cat1)) 207 catone = i; 208 if (rxp_match(cat2)) 209 cattwo = i; 210 s = next_cat(s); 211 } 212 if (catone && cattwo && catone != cattwo) { 213 if (!rxp_compile(qp->q_text)) 214 errx(1, "%s", rxperr); 215 get_file(rxp_expand()); 216 return; 217 } 218 } 219 errx(1, "invalid categories"); 220 } 221 222 void 223 quiz(void) 224 { 225 QE *qp; 226 int i; 227 size_t len; 228 u_int guesses, rights, wrongs; 229 int next; 230 char *answer, *t, question[LINE_SZ]; 231 const char *s; 232 233 guesses = rights = wrongs = 0; 234 for (;;) { 235 if (qsize == 0) 236 break; 237 next = arc4random_uniform(qsize); 238 qp = qlist.q_next; 239 for (i = 0; i < next; i++) 240 qp = qp->q_next; 241 while (qp && qp->q_answered) 242 qp = qp->q_next; 243 if (!qp) { 244 qsize = next; 245 continue; 246 } 247 if (tflag && arc4random_uniform(100) > 20) { 248 /* repeat questions in tutorial mode */ 249 while (qp && (!qp->q_asked || qp->q_answered)) 250 qp = qp->q_next; 251 if (!qp) 252 continue; 253 } 254 s = qp->q_text; 255 for (i = 0; i < catone - 1; i++) 256 s = next_cat(s); 257 if (!rxp_compile(s)) 258 errx(1, "%s", rxperr); 259 t = rxp_expand(); 260 if (!t || *t == '\0') { 261 qp->q_answered = TRUE; 262 continue; 263 } 264 (void)strlcpy(question, t, sizeof question); 265 s = qp->q_text; 266 for (i = 0; i < cattwo - 1; i++) 267 s = next_cat(s); 268 if (s == NULL) 269 errx(1, "too few fields in data file, line \"%s\"", 270 qp->q_text); 271 if (!rxp_compile(s)) 272 errx(1, "%s", rxperr); 273 t = rxp_expand(); 274 if (!t || *t == '\0') { 275 qp->q_answered = TRUE; 276 continue; 277 } 278 qp->q_asked = TRUE; 279 (void)printf("%s?\n", question); 280 for (;; ++guesses) { 281 if ((answer = fgetln(stdin, &len)) == NULL || 282 answer[len - 1] != '\n') { 283 score(rights, wrongs, guesses); 284 exit(0); 285 } 286 answer[len - 1] = '\0'; 287 downcase(answer); 288 if (rxp_match(answer)) { 289 (void)printf("Right!\n"); 290 ++rights; 291 qp->q_answered = TRUE; 292 break; 293 } 294 if (*answer == '\0') { 295 (void)printf("%s\n", t); 296 ++wrongs; 297 if (!tflag) 298 qp->q_answered = TRUE; 299 break; 300 } 301 (void)printf("What?\n"); 302 } 303 } 304 score(rights, wrongs, guesses); 305 } 306 307 const char * 308 next_cat(const char *s) 309 { 310 int esc; 311 312 if (s == NULL) 313 return (NULL); 314 esc = 0; 315 for (;;) 316 switch (*s++) { 317 case '\0': 318 return (NULL); 319 case '\\': 320 esc = 1; 321 break; 322 case ':': 323 if (!esc) 324 return (s); 325 default: 326 esc = 0; 327 break; 328 } 329 } 330 331 void 332 score(u_int r, u_int w, u_int g) 333 { 334 (void)printf("Rights %d, wrongs %d,", r, w); 335 if (g) 336 (void)printf(" extra guesses %d,", g); 337 (void)printf(" score %d%%\n", (r + w + g) ? r * 100 / (r + w + g) : 0); 338 } 339 340 void 341 downcase(char *p) 342 { 343 int ch; 344 345 for (; (ch = *p) != '\0'; ++p) 346 if (isascii(ch) && isupper(ch)) 347 *p = tolower(ch); 348 } 349 350 void 351 usage(void) 352 { 353 (void)fprintf(stderr, 354 "usage: %s [-t] [-i file] category1 category2\n", getprogname()); 355 exit(1); 356 } 357