| 1 | /* Copyright (c) 1980 Regents of the University of California */ |
| 2 | static char *sccsid = "%W% %G%"; |
| 3 | #include "ex.h" |
| 4 | #include "ex_argv.h" |
| 5 | #include "ex_temp.h" |
| 6 | #include "ex_tty.h" |
| 7 | |
| 8 | #ifdef TRACE |
| 9 | char tttrace[] = { '/','d','e','v','/','t','t','y','x','x',0 }; |
| 10 | #endif |
| 11 | |
| 12 | /* |
| 13 | * The code for ex is divided as follows: |
| 14 | * |
| 15 | * ex.c Entry point and routines handling interrupt, hangup |
| 16 | * signals; initialization code. |
| 17 | * |
| 18 | * ex_addr.c Address parsing routines for command mode decoding. |
| 19 | * Routines to set and check address ranges on commands. |
| 20 | * |
| 21 | * ex_cmds.c Command mode command decoding. |
| 22 | * |
| 23 | * ex_cmds2.c Subroutines for command decoding and processing of |
| 24 | * file names in the argument list. Routines to print |
| 25 | * messages and reset state when errors occur. |
| 26 | * |
| 27 | * ex_cmdsub.c Subroutines which implement command mode functions |
| 28 | * such as append, delete, join. |
| 29 | * |
| 30 | * ex_data.c Initialization of options. |
| 31 | * |
| 32 | * ex_get.c Command mode input routines. |
| 33 | * |
| 34 | * ex_io.c General input/output processing: file i/o, unix |
| 35 | * escapes, filtering, source commands, preserving |
| 36 | * and recovering. |
| 37 | * |
| 38 | * ex_put.c Terminal driving and optimizing routines for low-level |
| 39 | * output (cursor-positioning); output line formatting |
| 40 | * routines. |
| 41 | * |
| 42 | * ex_re.c Global commands, substitute, regular expression |
| 43 | * compilation and execution. |
| 44 | * |
| 45 | * ex_set.c The set command. |
| 46 | * |
| 47 | * ex_subr.c Loads of miscellaneous subroutines. |
| 48 | * |
| 49 | * ex_temp.c Editor buffer routines for main buffer and also |
| 50 | * for named buffers (Q registers if you will.) |
| 51 | * |
| 52 | * ex_tty.c Terminal dependent initializations from termcap |
| 53 | * data base, grabbing of tty modes (at beginning |
| 54 | * and after escapes). |
| 55 | * |
| 56 | * ex_unix.c Routines for the ! command and its variations. |
| 57 | * |
| 58 | * ex_v*.c Visual/open mode routines... see ex_v.c for a |
| 59 | * guide to the overall organization. |
| 60 | */ |
| 61 | |
| 62 | /* |
| 63 | * Main procedure. Process arguments and then |
| 64 | * transfer control to the main command processing loop |
| 65 | * in the routine commands. We are entered as either "ex", "edit", "vi" |
| 66 | * or "view" and the distinction is made here. Actually, we are "vi" if |
| 67 | * there is a 'v' in our name, "view" is there is a 'w', and "edit" if |
| 68 | * there is a 'd' in our name. For edit we just diddle options; |
| 69 | * for vi we actually force an early visual command. |
| 70 | */ |
| 71 | main(ac, av) |
| 72 | register int ac; |
| 73 | register char *av[]; |
| 74 | { |
| 75 | #ifndef VMUNIX |
| 76 | char *erpath = EXSTRINGS; |
| 77 | #endif |
| 78 | register char *cp; |
| 79 | register int c; |
| 80 | bool recov = 0; |
| 81 | bool ivis; |
| 82 | bool itag = 0; |
| 83 | bool fast = 0; |
| 84 | extern int onemt(); |
| 85 | #ifdef TRACE |
| 86 | register char *tracef; |
| 87 | #endif |
| 88 | |
| 89 | /* |
| 90 | * Immediately grab the tty modes so that we wont |
| 91 | * get messed up if an interrupt comes in quickly. |
| 92 | */ |
| 93 | gTTY(1); |
| 94 | #ifndef USG3TTY |
| 95 | normf = tty.sg_flags; |
| 96 | #else |
| 97 | normf = tty; |
| 98 | #endif |
| 99 | ppid = getpid(); |
| 100 | /* |
| 101 | * Defend against d's, v's, w's, and a's in directories of |
| 102 | * path leading to our true name. |
| 103 | */ |
| 104 | av[0] = tailpath(av[0]); |
| 105 | |
| 106 | /* |
| 107 | * Figure out how we were invoked: ex, edit, vi, view. |
| 108 | */ |
| 109 | ivis = any('v', av[0]); /* "vi" */ |
| 110 | if (any('w', av[0])) /* "view" */ |
| 111 | value(READONLY) = 1; |
| 112 | if (any('d', av[0])) { /* "edit" */ |
| 113 | value(OPEN) = 0; |
| 114 | value(REPORT) = 1; |
| 115 | value(MAGIC) = 0; |
| 116 | } |
| 117 | |
| 118 | #ifndef VMUNIX |
| 119 | /* |
| 120 | * For debugging take files out of . if name is a.out. |
| 121 | */ |
| 122 | if (av[0][0] == 'a') |
| 123 | erpath = tailpath(erpath); |
| 124 | #endif |
| 125 | /* |
| 126 | * Open the error message file. |
| 127 | */ |
| 128 | draino(); |
| 129 | #ifndef VMUNIX |
| 130 | erfile = open(erpath+4, 0); |
| 131 | if (erfile < 0) { |
| 132 | erfile = open(erpath, 0); |
| 133 | } |
| 134 | #endif |
| 135 | pstop(); |
| 136 | |
| 137 | /* |
| 138 | * Initialize interrupt handling. |
| 139 | */ |
| 140 | oldhup = signal(SIGHUP, SIG_IGN); |
| 141 | if (oldhup == SIG_DFL) |
| 142 | signal(SIGHUP, onhup); |
| 143 | oldquit = signal(SIGQUIT, SIG_IGN); |
| 144 | ruptible = signal(SIGINT, SIG_IGN) == SIG_DFL; |
| 145 | if (signal(SIGTERM, SIG_IGN) == SIG_DFL) |
| 146 | signal(SIGTERM, onhup); |
| 147 | if (signal(SIGEMT, SIG_IGN) == SIG_DFL) |
| 148 | signal(SIGEMT, onemt); |
| 149 | |
| 150 | /* |
| 151 | * Initialize end of core pointers. |
| 152 | * Normally we avoid breaking back to fendcore after each |
| 153 | * file since this can be expensive (much core-core copying). |
| 154 | * If your system can scatter load processes you could do |
| 155 | * this as ed does, saving a little core, but it will probably |
| 156 | * not often make much difference. |
| 157 | */ |
| 158 | fendcore = (line *) sbrk(0); |
| 159 | endcore = fendcore - 2; |
| 160 | |
| 161 | /* |
| 162 | * Process flag arguments. |
| 163 | */ |
| 164 | ac--, av++; |
| 165 | while (ac && av[0][0] == '-') { |
| 166 | c = av[0][1]; |
| 167 | if (c == 0) { |
| 168 | hush = 1; |
| 169 | value(AUTOPRINT) = 0; |
| 170 | fast++; |
| 171 | } else switch (c) { |
| 172 | |
| 173 | case 'R': |
| 174 | value(READONLY) = 1; |
| 175 | break; |
| 176 | |
| 177 | #ifdef TRACE |
| 178 | case 'T': |
| 179 | if (av[0][2] == 0) |
| 180 | tracef = "trace"; |
| 181 | else { |
| 182 | tracef = tttrace; |
| 183 | tracef[8] = av[0][2]; |
| 184 | if (tracef[8]) |
| 185 | tracef[9] = av[0][3]; |
| 186 | else |
| 187 | tracef[9] = 0; |
| 188 | } |
| 189 | trace = fopen(tracef, "w"); |
| 190 | if (trace == NULL) |
| 191 | printf("Trace create error\n"); |
| 192 | setbuf(trace, tracbuf); |
| 193 | break; |
| 194 | |
| 195 | #endif |
| 196 | |
| 197 | #ifdef LISPCODE |
| 198 | case 'l': |
| 199 | value(LISP) = 1; |
| 200 | value(SHOWMATCH) = 1; |
| 201 | break; |
| 202 | #endif |
| 203 | |
| 204 | case 'r': |
| 205 | recov++; |
| 206 | break; |
| 207 | |
| 208 | case 't': |
| 209 | if (ac > 1 && av[1][0] != '-') { |
| 210 | ac--, av++; |
| 211 | itag = 1; |
| 212 | /* BUG: should check for too long tag. */ |
| 213 | CP(lasttag, av[0]); |
| 214 | } |
| 215 | break; |
| 216 | |
| 217 | case 'v': |
| 218 | ivis = 1; |
| 219 | break; |
| 220 | |
| 221 | case 'w': |
| 222 | defwind = 0; |
| 223 | if (av[0][2] == 0) defwind = 3; |
| 224 | else for (cp = &av[0][2]; isdigit(*cp); cp++) |
| 225 | defwind = 10*defwind + *cp - '0'; |
| 226 | break; |
| 227 | |
| 228 | #ifdef CRYPT |
| 229 | case 'x': |
| 230 | /* -x: encrypted mode */ |
| 231 | xflag = 1; |
| 232 | break; |
| 233 | #endif |
| 234 | |
| 235 | default: |
| 236 | smerror("Unknown option %s\n", av[0]); |
| 237 | break; |
| 238 | } |
| 239 | ac--, av++; |
| 240 | } |
| 241 | |
| 242 | #ifdef SIGTSTP |
| 243 | if (!hush && signal(SIGTSTP, SIG_IGN) == SIG_DFL) |
| 244 | signal(SIGTSTP, onsusp), dosusp++; |
| 245 | #endif |
| 246 | |
| 247 | if (ac && av[0][0] == '+') { |
| 248 | firstpat = &av[0][1]; |
| 249 | ac--, av++; |
| 250 | } |
| 251 | |
| 252 | #ifdef CRYPT |
| 253 | if(xflag){ |
| 254 | key = getpass(KEYPROMPT); |
| 255 | kflag = crinit(key, perm); |
| 256 | } |
| 257 | #endif |
| 258 | |
| 259 | /* |
| 260 | * If we are doing a recover and no filename |
| 261 | * was given, then execute an exrecover command with |
| 262 | * the -r option to type out the list of saved file names. |
| 263 | * Otherwise set the remembered file name to the first argument |
| 264 | * file name so the "recover" initial command will find it. |
| 265 | */ |
| 266 | if (recov) { |
| 267 | if (ac == 0) { |
| 268 | ppid = 0; |
| 269 | setrupt(); |
| 270 | execl(EXRECOVER, "exrecover", "-r", 0); |
| 271 | filioerr(EXRECOVER); |
| 272 | exit(1); |
| 273 | } |
| 274 | CP(savedfile, *av++), ac--; |
| 275 | } |
| 276 | |
| 277 | /* |
| 278 | * Initialize the argument list. |
| 279 | */ |
| 280 | argv0 = av; |
| 281 | argc0 = ac; |
| 282 | args0 = av[0]; |
| 283 | erewind(); |
| 284 | |
| 285 | /* |
| 286 | * Initialize a temporary file (buffer) and |
| 287 | * set up terminal environment. Read user startup commands. |
| 288 | */ |
| 289 | if (setexit() == 0) { |
| 290 | setrupt(); |
| 291 | intty = isatty(0); |
| 292 | value(PROMPT) = intty; |
| 293 | if (cp = getenv("SHELL")) |
| 294 | CP(shell, cp); |
| 295 | if (fast || !intty) |
| 296 | setterm("dumb"); |
| 297 | else { |
| 298 | gettmode(); |
| 299 | if ((cp = getenv("TERM")) != 0 && *cp) |
| 300 | setterm(cp); |
| 301 | } |
| 302 | } |
| 303 | if (setexit() == 0 && !fast && intty) |
| 304 | if ((globp = getenv("EXINIT")) && *globp) |
| 305 | commands(1,1); |
| 306 | else { |
| 307 | globp = 0; |
| 308 | if ((cp = getenv("HOME")) != 0 && *cp) |
| 309 | source(strcat(strcpy(genbuf, cp), "/.exrc"), 1); |
| 310 | } |
| 311 | init(); /* moved after prev 2 chunks to fix directory option */ |
| 312 | |
| 313 | /* |
| 314 | * Initial processing. Handle tag, recover, and file argument |
| 315 | * implied next commands. If going in as 'vi', then don't do |
| 316 | * anything, just set initev so we will do it later (from within |
| 317 | * visual). |
| 318 | */ |
| 319 | if (setexit() == 0) { |
| 320 | if (recov) |
| 321 | globp = "recover"; |
| 322 | else if (itag) |
| 323 | globp = ivis ? "tag" : "tag|p"; |
| 324 | else if (argc) |
| 325 | globp = "next"; |
| 326 | if (ivis) |
| 327 | initev = globp; |
| 328 | else if (globp) { |
| 329 | inglobal = 1; |
| 330 | commands(1, 1); |
| 331 | inglobal = 0; |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | /* |
| 336 | * Vi command... go into visual. |
| 337 | * Strange... everything in vi usually happens |
| 338 | * before we ever "start". |
| 339 | */ |
| 340 | if (ivis) { |
| 341 | /* |
| 342 | * Don't have to be upward compatible with stupidity |
| 343 | * of starting editing at line $. |
| 344 | */ |
| 345 | if (dol > zero) |
| 346 | dot = one; |
| 347 | globp = "visual"; |
| 348 | if (setexit() == 0) |
| 349 | commands(1, 1); |
| 350 | } |
| 351 | |
| 352 | /* |
| 353 | * Clear out trash in state accumulated by startup, |
| 354 | * and then do the main command loop for a normal edit. |
| 355 | * If you quit out of a 'vi' command by doing Q or ^\, |
| 356 | * you also fall through to here. |
| 357 | */ |
| 358 | seenprompt = 1; |
| 359 | ungetchar(0); |
| 360 | globp = 0; |
| 361 | initev = 0; |
| 362 | setlastchar('\n'); |
| 363 | setexit(); |
| 364 | commands(0, 0); |
| 365 | cleanup(1); |
| 366 | exit(0); |
| 367 | } |
| 368 | |
| 369 | /* |
| 370 | * Initialization, before editing a new file. |
| 371 | * Main thing here is to get a new buffer (in fileinit), |
| 372 | * rest is peripheral state resetting. |
| 373 | */ |
| 374 | init() |
| 375 | { |
| 376 | register int i; |
| 377 | |
| 378 | fileinit(); |
| 379 | dot = zero = truedol = unddol = dol = fendcore; |
| 380 | one = zero+1; |
| 381 | undkind = UNDNONE; |
| 382 | chng = 0; |
| 383 | edited = 0; |
| 384 | for (i = 0; i <= 'z'-'a'+1; i++) |
| 385 | names[i] = 1; |
| 386 | anymarks = 0; |
| 387 | #ifdef CRYPT |
| 388 | if(xflag) { |
| 389 | xtflag = 1; |
| 390 | makekey(key, tperm); |
| 391 | } |
| 392 | #endif |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * When a hangup occurs our actions are similar to a preserve |
| 397 | * command. If the buffer has not been [Modified], then we do |
| 398 | * nothing but remove the temporary files and exit. |
| 399 | * Otherwise, we sync the temp file and then attempt a preserve. |
| 400 | * If the preserve succeeds, we unlink our temp files. |
| 401 | * If the preserve fails, we leave the temp files as they are |
| 402 | * as they are a backup even without preservation if they |
| 403 | * are not removed. |
| 404 | */ |
| 405 | onhup() |
| 406 | { |
| 407 | |
| 408 | /* |
| 409 | * USG tty driver can send multiple HUP's!! |
| 410 | */ |
| 411 | signal(SIGINT, SIG_IGN); |
| 412 | signal(SIGHUP, SIG_IGN); |
| 413 | if (chng == 0) { |
| 414 | cleanup(1); |
| 415 | exit(0); |
| 416 | } |
| 417 | if (setexit() == 0) { |
| 418 | if (preserve()) { |
| 419 | cleanup(1); |
| 420 | exit(0); |
| 421 | } |
| 422 | } |
| 423 | exit(1); |
| 424 | } |
| 425 | |
| 426 | /* |
| 427 | * An interrupt occurred. Drain any output which |
| 428 | * is still in the output buffering pipeline. |
| 429 | * Catch interrupts again. Unless we are in visual |
| 430 | * reset the output state (out of -nl mode, e.g). |
| 431 | * Then like a normal error (with the \n before Interrupt |
| 432 | * suppressed in visual mode). |
| 433 | */ |
| 434 | onintr() |
| 435 | { |
| 436 | |
| 437 | #ifndef CBREAK |
| 438 | signal(SIGINT, onintr); |
| 439 | #else |
| 440 | signal(SIGINT, inopen ? vintr : onintr); |
| 441 | #endif |
| 442 | draino(); |
| 443 | if (!inopen) { |
| 444 | pstop(); |
| 445 | setlastchar('\n'); |
| 446 | #ifdef CBREAK |
| 447 | } |
| 448 | #else |
| 449 | } else |
| 450 | vraw(); |
| 451 | #endif |
| 452 | error("\nInterrupt" + inopen); |
| 453 | } |
| 454 | |
| 455 | /* |
| 456 | * If we are interruptible, enable interrupts again. |
| 457 | * In some critical sections we turn interrupts off, |
| 458 | * but not very often. |
| 459 | */ |
| 460 | setrupt() |
| 461 | { |
| 462 | |
| 463 | if (ruptible) { |
| 464 | #ifndef CBREAK |
| 465 | signal(SIGINT, onintr); |
| 466 | #else |
| 467 | signal(SIGINT, inopen ? vintr : onintr); |
| 468 | #endif |
| 469 | #ifdef SIGTSTP |
| 470 | if (dosusp) |
| 471 | signal(SIGTSTP, onsusp); |
| 472 | #endif |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | preserve() |
| 477 | { |
| 478 | |
| 479 | #ifdef VMUNIX |
| 480 | tflush(); |
| 481 | #endif |
| 482 | synctmp(); |
| 483 | pid = fork(); |
| 484 | if (pid < 0) |
| 485 | return (0); |
| 486 | if (pid == 0) { |
| 487 | close(0); |
| 488 | dup(tfile); |
| 489 | execl(EXPRESERVE, "expreserve", (char *) 0); |
| 490 | exit(1); |
| 491 | } |
| 492 | waitfor(); |
| 493 | if (rpid == pid && status == 0) |
| 494 | return (1); |
| 495 | return (0); |
| 496 | } |
| 497 | |
| 498 | #ifndef V6 |
| 499 | exit(i) |
| 500 | int i; |
| 501 | { |
| 502 | |
| 503 | # ifdef TRACE |
| 504 | if (trace) |
| 505 | fclose(trace); |
| 506 | # endif |
| 507 | _exit(i); |
| 508 | } |
| 509 | #endif |
| 510 | |
| 511 | /* |
| 512 | * Return last component of unix path name p. |
| 513 | */ |
| 514 | char * |
| 515 | tailpath(p) |
| 516 | register char *p; |
| 517 | { |
| 518 | register char *r; |
| 519 | |
| 520 | for (r=p; *p; p++) |
| 521 | if (*p == '/') |
| 522 | r = p+1; |
| 523 | return(r); |
| 524 | } |