| 1 | /* Copyright (c) 1979 Regents of the University of California */ |
| 2 | #include "ex.h" |
| 3 | #include "ex_argv.h" |
| 4 | #include "ex_temp.h" |
| 5 | #include "ex_tty.h" |
| 6 | |
| 7 | #ifdef TRACE |
| 8 | char tttrace[] = { '/','d','e','v','/','t','t','y','x','x',0 }; |
| 9 | #endif |
| 10 | |
| 11 | /* |
| 12 | * The code for ex is divided as follows: |
| 13 | * |
| 14 | * ex.c Entry point and routines handling interrupt, hangup |
| 15 | * signals; initialization code. |
| 16 | * |
| 17 | * ex_addr.c Address parsing routines for command mode decoding. |
| 18 | * Routines to set and check address ranges on commands. |
| 19 | * |
| 20 | * ex_cmds.c Command mode command decoding. |
| 21 | * |
| 22 | * ex_cmds2.c Subroutines for command decoding and processing of |
| 23 | * file names in the argument list. Routines to print |
| 24 | * messages and reset state when errors occur. |
| 25 | * |
| 26 | * ex_cmdsub.c Subroutines which implement command mode functions |
| 27 | * such as append, delete, join. |
| 28 | * |
| 29 | * ex_data.c Initialization of options. |
| 30 | * |
| 31 | * ex_get.c Command mode input routines. |
| 32 | * |
| 33 | * ex_io.c General input/output processing: file i/o, unix |
| 34 | * escapes, filtering, source commands, preserving |
| 35 | * and recovering. |
| 36 | * |
| 37 | * ex_put.c Terminal driving and optimizing routines for low-level |
| 38 | * output (cursor-positioning); output line formatting |
| 39 | * routines. |
| 40 | * |
| 41 | * ex_re.c Global commands, substitute, regular expression |
| 42 | * compilation and execution. |
| 43 | * |
| 44 | * ex_set.c The set command. |
| 45 | * |
| 46 | * ex_subr.c Loads of miscellaneous subroutines. |
| 47 | * |
| 48 | * ex_temp.c Editor buffer routines for main buffer and also |
| 49 | * for named buffers (Q registers if you will.) |
| 50 | * |
| 51 | * ex_tty.c Terminal dependent initializations from termcap |
| 52 | * data base, grabbing of tty modes (at beginning |
| 53 | * and after escapes). |
| 54 | * |
| 55 | * ex_v*.c Visual/open mode routines... see ex_v.c for a |
| 56 | * guide to the overall organization. |
| 57 | */ |
| 58 | |
| 59 | /* |
| 60 | * Main procedure. Process arguments and then |
| 61 | * transfer control to the main command processing loop |
| 62 | * in the routine commands. We are entered as either "ex", "edit" or "vi" |
| 63 | * and the distinction is made here. Actually, we are "vi" if |
| 64 | * there is a 'v' in our name, and "edit" if there is a 'd' in our |
| 65 | * name. For edit we just diddle options; for vi we actually |
| 66 | * force an early visual command, setting the external initev so |
| 67 | * the q command in visual doesn't give command mode. |
| 68 | */ |
| 69 | main(ac, av) |
| 70 | register int ac; |
| 71 | register char *av[]; |
| 72 | { |
| 73 | #ifndef VMUNIX |
| 74 | char *erpath = EXSTRINGS; |
| 75 | #endif |
| 76 | register char *cp; |
| 77 | register int c; |
| 78 | bool recov = 0; |
| 79 | bool ivis; |
| 80 | bool itag = 0; |
| 81 | bool fast = 0; |
| 82 | #ifdef TRACE |
| 83 | register char *tracef; |
| 84 | #endif |
| 85 | |
| 86 | /* |
| 87 | * Immediately grab the tty modes so that we wont |
| 88 | * get messed up if an interrupt comes in quickly. |
| 89 | */ |
| 90 | gTTY(1); |
| 91 | normf = tty.sg_flags; |
| 92 | ppid = getpid(); |
| 93 | /* |
| 94 | * Defend against d's, v's, and a's in directories of |
| 95 | * path leading to our true name. |
| 96 | */ |
| 97 | av[0] = tailpath(av[0]); |
| 98 | ivis = any('v', av[0]); |
| 99 | |
| 100 | /* |
| 101 | * For debugging take files out of . if name is a.out. |
| 102 | * If a 'd' in our name, then set options for edit. |
| 103 | */ |
| 104 | #ifndef VMUNIX |
| 105 | if (av[0][0] == 'a') |
| 106 | erpath = tailpath(erpath); |
| 107 | #endif |
| 108 | if (ivis) { |
| 109 | #ifdef notdef |
| 110 | options[BEAUTIFY].odefault = value(BEAUTIFY) = 1; |
| 111 | #endif |
| 112 | } else if (any('d', av[0])) { |
| 113 | value(OPEN) = 0; |
| 114 | value(REPORT) = 1; |
| 115 | value(MAGIC) = 0; |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * Open the error message file. |
| 120 | */ |
| 121 | draino(); |
| 122 | #ifndef VMUNIX |
| 123 | erfile = open(erpath+4, 0); |
| 124 | if (erfile < 0) { |
| 125 | erfile = open(erpath, 0); |
| 126 | } |
| 127 | #endif |
| 128 | pstop(); |
| 129 | |
| 130 | /* |
| 131 | * Initialize interrupt handling. |
| 132 | */ |
| 133 | oldhup = signal(SIGHUP, SIG_IGN); |
| 134 | if (oldhup == SIG_DFL) |
| 135 | signal(SIGHUP, onhup); |
| 136 | oldquit = signal(SIGQUIT, SIG_IGN); |
| 137 | ruptible = signal(SIGINT, SIG_IGN) == SIG_DFL; |
| 138 | if (signal(SIGTERM, SIG_IGN) == SIG_DFL) |
| 139 | signal(SIGTERM, onhup); |
| 140 | |
| 141 | /* |
| 142 | * Initialize end of core pointers. |
| 143 | * Normally we avoid breaking back to fendcore after each |
| 144 | * file since this can be expensive (much core-core copying). |
| 145 | * If your system can scatter load processes you could do |
| 146 | * this as ed does, saving a little core, but it will probably |
| 147 | * not often make much difference. |
| 148 | */ |
| 149 | fendcore = (line *) sbrk(0); |
| 150 | endcore = fendcore - 2; |
| 151 | |
| 152 | /* |
| 153 | * Process flag arguments. |
| 154 | */ |
| 155 | ac--, av++; |
| 156 | while (ac && av[0][0] == '-') { |
| 157 | c = av[0][1]; |
| 158 | if (c == 0) { |
| 159 | hush = 1; |
| 160 | value(AUTOPRINT) = 0; |
| 161 | fast++; |
| 162 | } else switch (c) { |
| 163 | |
| 164 | #ifdef TRACE |
| 165 | case 'T': |
| 166 | if (av[0][2] == 0) |
| 167 | tracef = "trace"; |
| 168 | else { |
| 169 | tracef = tttrace; |
| 170 | tracef[8] = av[0][2]; |
| 171 | if (tracef[8]) |
| 172 | tracef[9] = av[0][3]; |
| 173 | else |
| 174 | tracef[9] = 0; |
| 175 | } |
| 176 | trace = fopen(tracef, "w"); |
| 177 | if (trace == NULL) |
| 178 | printf("Trace create error\n"); |
| 179 | setbuf(trace, tracbuf); |
| 180 | break; |
| 181 | |
| 182 | #endif |
| 183 | |
| 184 | #ifdef LISPCODE |
| 185 | case 'l': |
| 186 | value(LISP) = 1; |
| 187 | value(SHOWMATCH) = 1; |
| 188 | break; |
| 189 | #endif |
| 190 | |
| 191 | case 'r': |
| 192 | recov++; |
| 193 | break; |
| 194 | |
| 195 | case 't': |
| 196 | if (ac > 1 && av[1][0] != '-') { |
| 197 | ac--, av++; |
| 198 | itag = 1; |
| 199 | /* BUG: should check for too long tag. */ |
| 200 | CP(lasttag, av[0]); |
| 201 | } |
| 202 | break; |
| 203 | |
| 204 | case 'v': |
| 205 | ivis = 1; |
| 206 | break; |
| 207 | |
| 208 | case 'w': |
| 209 | defwind = 0; |
| 210 | if (av[0][2] == 0) defwind = 3; |
| 211 | else for (cp = &av[0][2]; isdigit(*cp); cp++) |
| 212 | defwind = 10*defwind + *cp - '0'; |
| 213 | break; |
| 214 | |
| 215 | default: |
| 216 | smerror("Unknown option %s\n", av[0]); |
| 217 | break; |
| 218 | } |
| 219 | ac--, av++; |
| 220 | } |
| 221 | if (ac && av[0][0] == '+') { |
| 222 | firstpat = &av[0][1]; |
| 223 | ac--, av++; |
| 224 | } |
| 225 | |
| 226 | /* |
| 227 | * If we are doing a recover and no filename |
| 228 | * was given, then execute an exrecover command with |
| 229 | * the -r option to type out the list of saved file names. |
| 230 | * Otherwise set the remembered file name to the first argument |
| 231 | * file name so the "recover" initial command will find it. |
| 232 | */ |
| 233 | if (recov) { |
| 234 | if (ac == 0) { |
| 235 | ppid = 0; |
| 236 | setrupt(); |
| 237 | execl(EXRECOVER, "exrecover", "-r", 0); |
| 238 | filioerr(EXRECOVER); |
| 239 | exit(1); |
| 240 | } |
| 241 | CP(savedfile, *av++), ac--; |
| 242 | } |
| 243 | |
| 244 | /* |
| 245 | * Initialize the argument list. |
| 246 | */ |
| 247 | argv0 = av; |
| 248 | argc0 = ac; |
| 249 | args0 = av[0]; |
| 250 | erewind(); |
| 251 | |
| 252 | /* |
| 253 | * Initialize a temporary file (buffer) and |
| 254 | * set up terminal environment. Read user startup commands. |
| 255 | */ |
| 256 | init(); |
| 257 | if (setexit() == 0) { |
| 258 | setrupt(); |
| 259 | intty = isatty(0); |
| 260 | value(PROMPT) = intty; |
| 261 | if (fast || !intty) |
| 262 | setterm("dumb"); |
| 263 | else { |
| 264 | gettmode(); |
| 265 | if ((cp = getenv("TERM")) != 0) |
| 266 | setterm(cp); |
| 267 | } |
| 268 | } |
| 269 | if (setexit() == 0 && !fast && intty) |
| 270 | if (globp = getenv("EXINIT")) |
| 271 | commands(1,1); |
| 272 | else if ((cp = getenv("HOME")) != 0) |
| 273 | source(strcat(strcpy(genbuf, cp), "/.exrc"), 1); |
| 274 | |
| 275 | /* |
| 276 | * Initial processing. Handle tag, recover, and file argument |
| 277 | * implied next commands. If going in as 'vi', then don't do |
| 278 | * anything, just set initev so we will do it later (from within |
| 279 | * visual). |
| 280 | */ |
| 281 | if (setexit() == 0) { |
| 282 | if (recov) |
| 283 | globp = "recover"; |
| 284 | else if (itag) |
| 285 | globp = ivis ? "tag" : "tag|p"; |
| 286 | else if (argc) |
| 287 | globp = "next"; |
| 288 | if (ivis) |
| 289 | initev = globp; |
| 290 | else if (globp) { |
| 291 | inglobal = 1; |
| 292 | commands(1, 1); |
| 293 | inglobal = 0; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | /* |
| 298 | * Vi command... go into visual. |
| 299 | * Strange... everything in vi usually happens |
| 300 | * before we ever "start". |
| 301 | */ |
| 302 | if (ivis) { |
| 303 | /* |
| 304 | * Don't have to be upward compatible with stupidity |
| 305 | * of starting editing at line $. |
| 306 | */ |
| 307 | if (dol > zero) |
| 308 | dot = one; |
| 309 | globp = "visual"; |
| 310 | if (setexit() == 0) |
| 311 | commands(1, 1); |
| 312 | } |
| 313 | |
| 314 | /* |
| 315 | * Clear out trash in state accumulated by startup, |
| 316 | * and then do the main command loop for a normal edit. |
| 317 | * If you quit out of a 'vi' command by doing Q or ^\, |
| 318 | * you also fall through to here. |
| 319 | */ |
| 320 | ungetchar(0); |
| 321 | globp = 0; |
| 322 | initev = 0; |
| 323 | setlastchar('\n'); |
| 324 | setexit(); |
| 325 | commands(0, 0); |
| 326 | cleanup(1); |
| 327 | exit(0); |
| 328 | } |
| 329 | |
| 330 | /* |
| 331 | * Initialization, before editing a new file. |
| 332 | * Main thing here is to get a new buffer (in fileinit), |
| 333 | * rest is peripheral state resetting. |
| 334 | */ |
| 335 | init() |
| 336 | { |
| 337 | register int i; |
| 338 | |
| 339 | fileinit(); |
| 340 | dot = zero = truedol = unddol = dol = fendcore; |
| 341 | one = zero+1; |
| 342 | undkind = UNDNONE; |
| 343 | chng = 0; |
| 344 | edited = 0; |
| 345 | for (i = 0; i <= 'z'-'a'+1; i++) |
| 346 | names[i] = 1; |
| 347 | anymarks = 0; |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * When a hangup occurs our actions are similar to a preserve |
| 352 | * command. If the buffer has not been [Modified], then we do |
| 353 | * nothing but remove the temporary files and exit. |
| 354 | * Otherwise, we sync the temp file and then attempt a preserve. |
| 355 | * If the preserve succeeds, we unlink our temp files. |
| 356 | * If the preserve fails, we leave the temp files as they are |
| 357 | * as they are a backup even without preservation if they |
| 358 | * are not removed. |
| 359 | */ |
| 360 | onhup() |
| 361 | { |
| 362 | |
| 363 | if (chng == 0) { |
| 364 | cleanup(1); |
| 365 | exit(0); |
| 366 | } |
| 367 | if (setexit() == 0) { |
| 368 | if (preserve()) { |
| 369 | cleanup(1); |
| 370 | exit(0); |
| 371 | } |
| 372 | } |
| 373 | exit(1); |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * An interrupt occurred. Drain any output which |
| 378 | * is still in the output buffering pipeline. |
| 379 | * Catch interrupts again. Unless we are in visual |
| 380 | * reset the output state (out of -nl mode, e.g). |
| 381 | * Then like a normal error (with the \n before Interrupt |
| 382 | * suppressed in visual mode). |
| 383 | */ |
| 384 | onintr() |
| 385 | { |
| 386 | |
| 387 | #ifndef CBREAK |
| 388 | signal(SIGINT, onintr); |
| 389 | #else |
| 390 | signal(SIGINT, inopen ? vintr : onintr); |
| 391 | #endif |
| 392 | draino(); |
| 393 | if (!inopen) { |
| 394 | pstop(); |
| 395 | setlastchar('\n'); |
| 396 | #ifdef CBREAK |
| 397 | } |
| 398 | #else |
| 399 | } else |
| 400 | vraw(); |
| 401 | #endif |
| 402 | error("\nInterrupt" + inopen); |
| 403 | } |
| 404 | |
| 405 | /* |
| 406 | * If we are interruptible, enable interrupts again. |
| 407 | * In some critical sections we turn interrupts off, |
| 408 | * but not very often. |
| 409 | */ |
| 410 | setrupt() |
| 411 | { |
| 412 | |
| 413 | if (ruptible) |
| 414 | #ifndef CBREAK |
| 415 | signal(SIGINT, onintr); |
| 416 | #else |
| 417 | signal(SIGINT, inopen ? vintr : onintr); |
| 418 | #endif |
| 419 | } |
| 420 | |
| 421 | preserve() |
| 422 | { |
| 423 | |
| 424 | synctmp(); |
| 425 | pid = fork(); |
| 426 | if (pid < 0) |
| 427 | return (0); |
| 428 | if (pid == 0) { |
| 429 | close(0); |
| 430 | dup(tfile); |
| 431 | execl(EXPRESERVE, "expreserve", (char *) 0); |
| 432 | exit(1); |
| 433 | } |
| 434 | waitfor(); |
| 435 | if (rpid == pid && status == 0) |
| 436 | return (1); |
| 437 | return (0); |
| 438 | } |
| 439 | |
| 440 | #ifndef V6 |
| 441 | exit(i) |
| 442 | int i; |
| 443 | { |
| 444 | |
| 445 | # ifdef TRACE |
| 446 | if (trace) |
| 447 | fclose(trace); |
| 448 | # endif |
| 449 | _exit(i); |
| 450 | } |
| 451 | #endif |
| 452 | |
| 453 | /* |
| 454 | * Return last component of unix path name p. |
| 455 | */ |
| 456 | char * |
| 457 | tailpath(p) |
| 458 | register char *p; |
| 459 | { |
| 460 | register char *r; |
| 461 | |
| 462 | for (r=p; *p; p++) |
| 463 | if (*p == '/') |
| 464 | r = p+1; |
| 465 | return(r); |
| 466 | } |