Source:NetHack 1.4f/pager.c
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Below is the full text to pager.c from the source code of NetHack 1.4f. To link to a particular line, write [[NetHack 1.4f/pager.c#line123]], for example.
Warning! This is the source code from an old release. For the latest release, see Source code
Screenshots and source code from Hack are used under the CWI license.
1. /* SCCS Id: @(#)pager.c 1.4 87/08/08 2. /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */ 3. /* pager.c - version 1.0.3 */ 4. 5. /* This file contains the command routine dowhatis() and a pager. */ 6. /* Also readmail() and doshell(), and generally the things that 7. contact the outside world. */ 8. 9. #include <stdio.h> 10. #include <signal.h> 11. #include "hack.h" 12. extern int CO, LI; /* usually COLNO and ROWNO+2 */ 13. extern char *CD; 14. extern char quitchars[]; 15. extern char *getenv(), *getlogin(); 16. int done1(); 17. 18. dowhatis() 19. { 20. FILE *fp; 21. char bufr[BUFSZ+6]; 22. register char *buf = &bufr[6], *ep, q; 23. extern char readchar(); 24. 25. if(!(fp = fopen(DATAFILE, "r"))) 26. pline("Cannot open data file!"); 27. else { 28. #ifndef GRAPHICS 29. pline("Specify what? "); 30. q = readchar(); 31. #else 32. coord cc; extern coord getpos(); 33. char r; 34. 35. pline("Please move the cursor to the unknown object."); 36. getpos(&cc, TRUE, "the unknown object"); 37. r = levl[cc.x][cc.y].scrsym; 38. 39. if (r == showsyms.stone) q = defsyms.stone; 40. else if (r == showsyms.vwall) q = defsyms.vwall; 41. else if (r == showsyms.hwall) q = defsyms.hwall; 42. else if (r == showsyms.tlcorn) q = defsyms.tlcorn; 43. else if (r == showsyms.trcorn) q = defsyms.trcorn; 44. else if (r == showsyms.blcorn) q = defsyms.blcorn; 45. else if (r == showsyms.brcorn) q = defsyms.brcorn; 46. else if (r == showsyms.door) q = defsyms.door; 47. else if (r == showsyms.room) q = defsyms.room; 48. else if (r == showsyms.corr) q = defsyms.corr; 49. else if (r == showsyms.upstair) q = defsyms.upstair; 50. else if (r == showsyms.dnstair) q = defsyms.dnstair; 51. else if (r == showsyms.trap) q = defsyms.trap; 52. #ifdef FOUNTAINS 53. else if (r == showsyms.pool) q = defsyms.pool; 54. else if (r == showsyms.fountain) q = defsyms.fountain; 55. #endif 56. #ifdef NEWCLASS 57. else if (r == showsyms.throne) q = defsyms.throne; 58. #endif 59. #ifdef SPIDERS 60. else if (r == showsyms.web) q = defsyms.web; 61. else 62. q = r; 63. #endif 64. #endif /* GRAPHICS */ 65. #ifdef DGKMOD 66. if (index(quitchars, q)) 67. return(0); 68. #endif 69. if(q != '\t') 70. while(fgets(buf,BUFSZ,fp)) 71. if(*buf == q) { 72. ep = index(buf, '\n'); 73. if(ep) *ep = 0; 74. /* else: bad data file */ 75. /* Expand tab 'by hand' */ 76. if(buf[1] == '\t'){ 77. buf = bufr; 78. #ifdef GRAPHICS 79. buf[0] = r; 80. #else 81. buf[0] = q; 82. #endif 83. (void) strncpy(buf+1, " ", 7); 84. } 85. pline(buf); 86. if(ep[-1] == ';') { 87. pline("More info? "); 88. if(readchar() == 'y') { 89. page_more(fp,1); /* does fclose() */ 90. return(0); 91. } 92. } 93. (void) fclose(fp); /* kopper@psuvax1 */ 94. return(0); 95. } 96. pline("I've never heard of such things."); 97. (void) fclose(fp); 98. } 99. return(0); 100. } 101. 102. /* make the paging of a file interruptible */ 103. static int got_intrup; 104. 105. intruph(){ 106. got_intrup++; 107. } 108. 109. /* simple pager, also used from dohelp() */ 110. page_more(fp,strip) 111. FILE *fp; 112. int strip; /* nr of chars to be stripped from each line (0 or 1) */ 113. { 114. register char *bufr, *ep; 115. #ifdef DGK 116. /* There seems to be a bug in ANSI.SYS The first tab character 117. * after a clear screen sequence is not expanded correctly. Thus 118. * expand the tabs by hand -dgk 119. */ 120. int tabstop = 8, spaces; 121. char buf[BUFSIZ], *bufp, *bufrp; 122. 123. set_pager(0); 124. bufr = (char *) alloc((unsigned) CO); 125. while (fgets(buf, BUFSIZ, fp) && (!strip || *buf == '\t')){ 126. bufp = buf; 127. bufrp = bufr; 128. while (*bufp && *bufp != '\n') { 129. if (*bufp == '\t') { 130. spaces = tabstop - (bufrp - bufr) % tabstop; 131. while (spaces--) 132. *bufrp++ = ' '; 133. bufp++; 134. } else 135. *bufrp++ = *bufp++; 136. } 137. *bufrp = '\0'; 138. #else 139. int (*prevsig)() = signal(SIGINT, intruph); 140. 141. set_pager(0); 142. bufr = (char *) alloc((unsigned) CO); 143. bufr[CO-1] = 0; 144. while(fgets(bufr,CO-1,fp) && (!strip || *bufr == '\t')){ 145. ep = index(bufr, '\n'); 146. if(ep) 147. *ep = 0; 148. #endif /* DGK /**/ 149. if(page_line(bufr+strip)) { 150. set_pager(2); 151. goto ret; 152. } 153. } 154. set_pager(1); 155. ret: 156. free(bufr); 157. (void) fclose(fp); 158. #ifndef DGK 159. (void) signal(SIGINT, prevsig); 160. got_intrup = 0; 161. #endif 162. } 163. 164. static boolean whole_screen = TRUE; 165. #define PAGMIN 12 /* minimum # of lines for page below level map */ 166. 167. set_whole_screen() { /* called in termcap as soon as LI is known */ 168. whole_screen = (LI-ROWNO-2 <= PAGMIN || !CD); 169. } 170. 171. #ifdef NEWS 172. readnews() { 173. register int ret; 174. 175. whole_screen = TRUE; /* force a docrt(), our first */ 176. ret = page_file(NEWS, TRUE); 177. set_whole_screen(); 178. return(ret); /* report whether we did docrt() */ 179. } 180. #endif 181. 182. set_pager(mode) 183. register int mode; /* 0: open 1: wait+close 2: close */ 184. { 185. static boolean so; 186. if(mode == 0) { 187. if(!whole_screen) { 188. /* clear topline */ 189. clrlin(); 190. /* use part of screen below level map */ 191. curs(1, ROWNO+4); 192. } else { 193. cls(); 194. } 195. so = flags.standout; 196. flags.standout = 1; 197. } else { 198. if(mode == 1) { 199. curs(1, LI); 200. more(); 201. } 202. flags.standout = so; 203. if(whole_screen) 204. docrt(); 205. else { 206. curs(1, ROWNO+4); 207. cl_eos(); 208. } 209. } 210. } 211. 212. page_line(s) /* returns 1 if we should quit */ 213. register char *s; 214. { 215. extern char morc; 216. 217. if(cury == LI-1) { 218. if(!*s) 219. return(0); /* suppress blank lines at top */ 220. putchar('\n'); 221. cury++; 222. cmore("q\033"); 223. if(morc) { 224. morc = 0; 225. return(1); 226. } 227. if(whole_screen) 228. cls(); 229. else { 230. curs(1, ROWNO+4); 231. cl_eos(); 232. } 233. } 234. puts(s); 235. cury++; 236. return(0); 237. } 238. 239. /* 240. * Flexible pager: feed it with a number of lines and it will decide 241. * whether these should be fed to the pager above, or displayed in a 242. * corner. 243. * Call: 244. * cornline(0, title or 0) : initialize 245. * cornline(1, text) : add text to the chain of texts 246. * cornline(2, morcs) : output everything and cleanup 247. * cornline(3, 0) : cleanup 248. */ 249. 250. cornline(mode, text) 251. int mode; 252. char *text; 253. { 254. static struct line { 255. struct line *next_line; 256. char *line_text; 257. } *texthead, *texttail; 258. static int maxlen; 259. static int linect; 260. register struct line *tl; 261. 262. if(mode == 0) { 263. texthead = 0; 264. maxlen = 0; 265. linect = 0; 266. if(text) { 267. cornline(1, text); /* title */ 268. cornline(1, ""); /* blank line */ 269. } 270. return; 271. } 272. 273. if(mode == 1) { 274. register int len; 275. 276. if(!text) return; /* superfluous, just to be sure */ 277. linect++; 278. len = strlen(text); 279. if(len > maxlen) 280. maxlen = len; 281. tl = (struct line *) 282. alloc((unsigned)(len + sizeof(struct line) + 1)); 283. tl->next_line = 0; 284. tl->line_text = (char *)(tl + 1); 285. (void) strcpy(tl->line_text, text); 286. if(!texthead) 287. texthead = tl; 288. else 289. texttail->next_line = tl; 290. texttail = tl; 291. return; 292. } 293. 294. /* --- now we really do it --- */ 295. if(mode == 2 && linect == 1) /* topline only */ 296. pline(texthead->line_text); 297. else 298. if(mode == 2) { 299. register int curline, lth; 300. 301. if(flags.toplin == 1) more(); /* ab@unido */ 302. remember_topl(); 303. 304. lth = CO - maxlen - 2; /* Use full screen width */ 305. if (linect < LI && lth >= 10) { /* in a corner */ 306. home (); 307. cl_end (); 308. flags.toplin = 0; 309. curline = 1; 310. for (tl = texthead; tl; tl = tl->next_line) { 311. curs (lth, curline); 312. if(curline > 1) 313. cl_end (); 314. putsym(' '); 315. putstr (tl->line_text); 316. curline++; 317. } 318. curs (lth, curline); 319. cl_end (); 320. cmore (text); 321. home (); 322. cl_end (); 323. docorner (lth, curline-1); 324. } else { /* feed to pager */ 325. set_pager(0); 326. for (tl = texthead; tl; tl = tl->next_line) { 327. if (page_line (tl->line_text)) { 328. set_pager(2); 329. goto cleanup; 330. } 331. } 332. if(text) { 333. cgetret(text); 334. set_pager(2); 335. } else 336. set_pager(1); 337. } 338. } 339. 340. cleanup: 341. while(tl = texthead) { 342. texthead = tl->next_line; 343. free((char *) tl); 344. } 345. } 346. 347. dohelp() 348. { 349. char c; 350. 351. pline ("Long or short help? "); 352. while (((c = readchar ()) != 'l') && (c != 's') && !index(quitchars,c)) 353. bell (); 354. if (!index(quitchars, c)) 355. (void) page_file((c == 'l') ? HELP : SHELP, FALSE); 356. return(0); 357. } 358. 359. page_file(fnam, silent) /* return: 0 - cannot open fnam; 1 - otherwise */ 360. register char *fnam; 361. boolean silent; 362. { 363. #ifdef DEF_PAGER /* this implies that UNIX is defined */ 364. { 365. /* use external pager; this may give security problems */ 366. 367. register int fd = open(fnam, 0); 368. 369. if(fd < 0) { 370. if(!silent) pline("Cannot open %s.", fnam); 371. return(0); 372. } 373. if(child(1)){ 374. extern char *catmore; 375. 376. /* Now that child() does a setuid(getuid()) and a chdir(), 377. we may not be able to open file fnam anymore, so make 378. it stdin. */ 379. (void) close(0); 380. if(dup(fd)) { 381. if(!silent) printf("Cannot open %s as stdin.\n", fnam); 382. } else { 383. execl(catmore, "page", (char *) 0); 384. if(!silent) printf("Cannot exec %s.\n", catmore); 385. } 386. exit(1); 387. } 388. (void) close(fd); 389. } 390. #else 391. { 392. FILE *f; /* free after Robert Viduya */ 393. 394. if ((f = fopen (fnam, "r")) == (FILE *) 0) { 395. if(!silent) { 396. home(); perror (fnam); flags.toplin = 1; 397. pline ("Cannot open %s.", fnam); 398. } 399. return(0); 400. } 401. page_more(f, 0); 402. } 403. #endif /* DEF_PAGER /**/ 404. 405. return(1); 406. } 407. 408. #ifdef UNIX 409. #ifdef SHELL 410. dosh(){ 411. register char *str; 412. if(child(0)) { 413. if(str = getenv("SHELL")) 414. execl(str, str, (char *) 0); 415. else 416. execl("/bin/sh", "sh", (char *) 0); 417. pline("sh: cannot execute."); 418. exit(1); 419. } 420. return(0); 421. } 422. #endif /* SHELL /**/ 423. 424. child(wt) { 425. register int f = fork(); 426. if(f == 0){ /* child */ 427. settty((char *) 0); /* also calls end_screen() */ 428. (void) setuid(getuid()); 429. (void) setgid(getgid()); 430. #ifdef CHDIR 431. (void) chdir(getenv("HOME")); 432. #endif 433. return(1); 434. } 435. if(f == -1) { /* cannot fork */ 436. pline("Fork failed. Try again."); 437. return(0); 438. } 439. /* fork succeeded; wait for child to exit */ 440. (void) signal(SIGINT,SIG_IGN); 441. (void) signal(SIGQUIT,SIG_IGN); 442. (void) wait((int *) 0); 443. gettty(); 444. setftty(); 445. (void) signal(SIGINT,done1); 446. #ifdef WIZARD 447. if(wizard) (void) signal(SIGQUIT,SIG_DFL); 448. #endif 449. if(wt) getret(); 450. docrt(); 451. return(0); 452. } 453. #endif /* UNIX /**/