1 /*- 2 * Copyright (c) 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 1992, 1993, 1994, 1995, 1996 5 * Keith Bostic. All rights reserved. 6 * 7 * See the LICENSE file for redistribution information. 8 */ 9 10 #include "config.h" 11 12 #ifndef lint 13 static const char sccsid[] = "@(#)ex.c 10.55 (Berkeley) 9/24/96"; 14 #endif /* not lint */ 15 16 #include <sys/types.h> 17 #include <sys/queue.h> 18 #include <sys/stat.h> 19 #include <sys/time.h> 20 21 #include <bitstring.h> 22 #include <ctype.h> 23 #include <errno.h> 24 #include <fcntl.h> 25 #include <limits.h> 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <unistd.h> 30 31 #include "../common/common.h" 32 #include "../vi/vi.h" 33 34 #if defined(DEBUG) && defined(COMLOG) 35 static void ex_comlog __P((SCR *, EXCMD *)); 36 #endif 37 static EXCMDLIST const * 38 ex_comm_search __P((char *, size_t)); 39 static int ex_discard __P((SCR *)); 40 static int ex_line __P((SCR *, EXCMD *, MARK *, int *, int *)); 41 static int ex_load __P((SCR *)); 42 static void ex_unknown __P((SCR *, char *, size_t)); 43 44 /* 45 * ex -- 46 * Main ex loop. 47 * 48 * PUBLIC: int ex __P((SCR **)); 49 */ 50 int 51 ex(spp) 52 SCR **spp; 53 { 54 EX_PRIVATE *exp; 55 GS *gp; 56 MSGS *mp; 57 SCR *sp; 58 TEXT *tp; 59 u_int32_t flags; 60 61 sp = *spp; 62 gp = sp->gp; 63 exp = EXP(sp); 64 65 /* Start the ex screen. */ 66 if (ex_init(sp)) 67 return (1); 68 69 /* Flush any saved messages. */ 70 while ((mp = gp->msgq.lh_first) != NULL) { 71 gp->scr_msg(sp, mp->mtype, mp->buf, mp->len); 72 LIST_REMOVE(mp, q); 73 free(mp->buf); 74 free(mp); 75 } 76 77 /* If reading from a file, errors should have name and line info. */ 78 if (F_ISSET(gp, G_SCRIPTED)) { 79 gp->excmd.if_lno = 1; 80 gp->excmd.if_name = "script"; 81 } 82 83 /* 84 * !!! 85 * Initialize the text flags. The beautify edit option historically 86 * applied to ex command input read from a file. In addition, the 87 * first time a ^H was discarded from the input, there was a message, 88 * "^H discarded", that was displayed. We don't bother. 89 */ 90 LF_INIT(TXT_BACKSLASH | TXT_CNTRLD | TXT_CR); 91 for (;; ++gp->excmd.if_lno) { 92 /* Display status line and flush. */ 93 if (F_ISSET(sp, SC_STATUS)) { 94 if (!F_ISSET(sp, SC_EX_SILENT)) 95 msgq_status(sp, sp->lno, 0); 96 F_CLR(sp, SC_STATUS); 97 } 98 (void)ex_fflush(sp); 99 100 /* Set the flags the user can reset. */ 101 if (O_ISSET(sp, O_BEAUTIFY)) 102 LF_SET(TXT_BEAUTIFY); 103 if (O_ISSET(sp, O_PROMPT)) 104 LF_SET(TXT_PROMPT); 105 106 /* Clear any current interrupts, and get a command. */ 107 CLR_INTERRUPT(sp); 108 if (ex_txt(sp, &sp->tiq, ':', flags)) 109 return (1); 110 if (INTERRUPTED(sp)) { 111 (void)ex_puts(sp, "\n"); 112 (void)ex_fflush(sp); 113 continue; 114 } 115 116 /* Initialize the command structure. */ 117 CLEAR_EX_PARSER(&gp->excmd); 118 119 /* 120 * If the user entered a single carriage return, send 121 * ex_cmd() a separator -- it discards single newlines. 122 */ 123 tp = sp->tiq.cqh_first; 124 if (tp->len == 0) { 125 gp->excmd.cp = " "; /* __TK__ why not |? */ 126 gp->excmd.clen = 1; 127 } else { 128 gp->excmd.cp = tp->lb; 129 gp->excmd.clen = tp->len; 130 } 131 F_INIT(&gp->excmd, E_NRSEP); 132 133 if (ex_cmd(sp) && F_ISSET(gp, G_SCRIPTED)) 134 return (1); 135 136 if (INTERRUPTED(sp)) { 137 CLR_INTERRUPT(sp); 138 msgq(sp, M_ERR, "170|Interrupted"); 139 } 140 141 /* 142 * If the last command caused a restart, or switched screens 143 * or into vi, return. 144 */ 145 if (F_ISSET(gp, G_SRESTART) || F_ISSET(sp, SC_SSWITCH | SC_VI)) { 146 *spp = sp; 147 break; 148 } 149 150 /* If the last command switched files, we don't care. */ 151 F_CLR(sp, SC_FSWITCH); 152 153 /* 154 * If we're exiting this screen, move to the next one. By 155 * definition, this means returning into vi, so return to the 156 * main editor loop. The ordering is careful, don't discard 157 * the contents of sp until the end. 158 */ 159 if (F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE)) { 160 if (file_end(sp, NULL, F_ISSET(sp, SC_EXIT_FORCE))) 161 return (1); 162 *spp = screen_next(sp); 163 return (screen_end(sp)); 164 } 165 } 166 return (0); 167 } 168 169 /* 170 * ex_cmd -- 171 * The guts of the ex parser: parse and execute a string containing 172 * ex commands. 173 * 174 * !!! 175 * This code MODIFIES the string that gets passed in, to delete quoting 176 * characters, etc. The string cannot be readonly/text space, nor should 177 * you expect to use it again after ex_cmd() returns. 178 * 179 * !!! 180 * For the fun of it, if you want to see if a vi clone got the ex argument 181 * parsing right, try: 182 * 183 * echo 'foo|bar' > file1; echo 'foo/bar' > file2; 184 * vi 185 * :edit +1|s/|/PIPE/|w file1| e file2|1 | s/\//SLASH/|wq 186 * 187 * or: vi 188 * :set|file|append|set|file 189 * 190 * For extra credit, try them in a startup .exrc file. 191 * 192 * PUBLIC: int ex_cmd __P((SCR *)); 193 */ 194 int 195 ex_cmd(sp) 196 SCR *sp; 197 { 198 enum nresult nret; 199 EX_PRIVATE *exp; 200 EXCMD *ecp; 201 GS *gp; 202 MARK cur; 203 recno_t lno; 204 size_t arg1_len, len; 205 u_int32_t flags; 206 long ltmp; 207 int at_found, gv_found; 208 int ch, cnt, delim, isaddr, namelen; 209 int newscreen, notempty, tmp, vi_address; 210 char *arg1, *p, *s, *t; 211 212 gp = sp->gp; 213 exp = EXP(sp); 214 215 /* 216 * We always start running the command on the top of the stack. 217 * This means that *everything* must be resolved when we leave 218 * this function for any reason. 219 */ 220 loop: ecp = gp->ecq.lh_first; 221 222 /* If we're reading a command from a file, set up error information. */ 223 if (ecp->if_name != NULL) { 224 gp->if_lno = ecp->if_lno; 225 gp->if_name = ecp->if_name; 226 } 227 228 /* 229 * If a move to the end of the file is scheduled for this command, 230 * do it now. 231 */ 232 if (F_ISSET(ecp, E_MOVETOEND)) { 233 if (db_last(sp, &sp->lno)) 234 goto rfail; 235 sp->cno = 0; 236 F_CLR(ecp, E_MOVETOEND); 237 } 238 239 /* If we found a newline, increment the count now. */ 240 if (F_ISSET(ecp, E_NEWLINE)) { 241 ++gp->if_lno; 242 ++ecp->if_lno; 243 F_CLR(ecp, E_NEWLINE); 244 } 245 246 /* (Re)initialize the EXCMD structure, preserving some flags. */ 247 CLEAR_EX_CMD(ecp); 248 249 /* Initialize the argument structures. */ 250 if (argv_init(sp, ecp)) 251 goto err; 252 253 /* Initialize +cmd, saved command information. */ 254 arg1 = NULL; 255 ecp->save_cmdlen = 0; 256 257 /* Skip <blank>s, empty lines. */ 258 for (notempty = 0; ecp->clen > 0; ++ecp->cp, --ecp->clen) 259 if ((ch = *ecp->cp) == '\n') { 260 ++gp->if_lno; 261 ++ecp->if_lno; 262 } else if (isblank(ch)) 263 notempty = 1; 264 else 265 break; 266 267 /* 268 * !!! 269 * Permit extra colons at the start of the line. Historically, 270 * ex/vi allowed a single extra one. It's simpler not to count. 271 * The stripping is done here because, historically, any command 272 * could have preceding colons, e.g. ":g/pattern/:p" worked. 273 */ 274 if (ecp->clen != 0 && ch == ':') { 275 notempty = 1; 276 while (--ecp->clen > 0 && (ch = *++ecp->cp) == ':'); 277 } 278 279 /* 280 * Command lines that start with a double-quote are comments. 281 * 282 * !!! 283 * Historically, there was no escape or delimiter for a comment, e.g. 284 * :"foo|set was a single comment and nothing was output. Since nvi 285 * permits users to escape <newline> characters into command lines, we 286 * have to check for that case. 287 */ 288 if (ecp->clen != 0 && ch == '"') { 289 while (--ecp->clen > 0 && *++ecp->cp != '\n'); 290 if (*ecp->cp == '\n') { 291 F_SET(ecp, E_NEWLINE); 292 ++ecp->cp; 293 --ecp->clen; 294 } 295 goto loop; 296 } 297 298 /* Skip whitespace. */ 299 for (; ecp->clen > 0; ++ecp->cp, --ecp->clen) { 300 ch = *ecp->cp; 301 if (!isblank(ch)) 302 break; 303 } 304 305 /* 306 * The last point at which an empty line can mean do nothing. 307 * 308 * !!! 309 * Historically, in ex mode, lines containing only <blank> characters 310 * were the same as a single <carriage-return>, i.e. a default command. 311 * In vi mode, they were ignored. In .exrc files this was a serious 312 * annoyance, as vi kept trying to treat them as print commands. We 313 * ignore backward compatibility in this case, discarding lines that 314 * contain only <blank> characters from .exrc files. 315 * 316 * !!! 317 * This is where you end up when you're done a command, i.e. clen has 318 * gone to zero. Continue if there are more commands to run. 319 */ 320 if (ecp->clen == 0 && 321 (!notempty || F_ISSET(sp, SC_VI) || F_ISSET(ecp, E_BLIGNORE))) { 322 if (ex_load(sp)) 323 goto rfail; 324 ecp = gp->ecq.lh_first; 325 if (ecp->clen == 0) 326 goto rsuccess; 327 goto loop; 328 } 329 330 /* 331 * Check to see if this is a command for which we may want to move 332 * the cursor back up to the previous line. (The command :1<CR> 333 * wants a <newline> separator, but the command :<CR> wants to erase 334 * the command line.) If the line is empty except for <blank>s, 335 * <carriage-return> or <eof>, we'll probably want to move up. I 336 * don't think there's any way to get <blank> characters *after* the 337 * command character, but this is the ex parser, and I've been wrong 338 * before. 339 */ 340 if (F_ISSET(ecp, E_NRSEP) && 341 ecp->clen != 0 && (ecp->clen != 1 || ecp->cp[0] != '\004')) 342 F_CLR(ecp, E_NRSEP); 343 344 /* Parse command addresses. */ 345 if (ex_range(sp, ecp, &tmp)) 346 goto rfail; 347 if (tmp) 348 goto err; 349 350 /* 351 * Skip <blank>s and any more colons (the command :3,5:print 352 * worked, historically). 353 */ 354 for (; ecp->clen > 0; ++ecp->cp, --ecp->clen) { 355 ch = *ecp->cp; 356 if (!isblank(ch) && ch != ':') 357 break; 358 } 359 360 /* 361 * If no command, ex does the last specified of p, l, or #, and vi 362 * moves to the line. Otherwise, determine the length of the command 363 * name by looking for the first non-alphabetic character. (There 364 * are a few non-alphabetic characters in command names, but they're 365 * all single character commands.) This isn't a great test, because 366 * it means that, for the command ":e +cut.c file", we'll report that 367 * the command "cut" wasn't known. However, it makes ":e+35 file" work 368 * correctly. 369 * 370 * !!! 371 * Historically, lines with multiple adjacent (or <blank> separated) 372 * command separators were very strange. For example, the command 373 * |||<carriage-return>, when the cursor was on line 1, displayed 374 * lines 2, 3 and 5 of the file. In addition, the command " | " 375 * would only display the line after the next line, instead of the 376 * next two lines. No ideas why. It worked reasonably when executed 377 * from vi mode, and displayed lines 2, 3, and 4, so we do a default 378 * command for each separator. 379 */ 380 #define SINGLE_CHAR_COMMANDS "\004!#&*<=>@~" 381 newscreen = 0; 382 if (ecp->clen != 0 && ecp->cp[0] != '|' && ecp->cp[0] != '\n') { 383 if (strchr(SINGLE_CHAR_COMMANDS, *ecp->cp)) { 384 p = ecp->cp; 385 ++ecp->cp; 386 --ecp->clen; 387 namelen = 1; 388 } else { 389 for (p = ecp->cp; 390 ecp->clen > 0; --ecp->clen, ++ecp->cp) 391 if (!isalpha(*ecp->cp)) 392 break; 393 if ((namelen = ecp->cp - p) == 0) { 394 msgq(sp, M_ERR, "080|Unknown command name"); 395 goto err; 396 } 397 } 398 399 /* 400 * !!! 401 * Historic vi permitted flags to immediately follow any 402 * subset of the 'delete' command, but then did not permit 403 * further arguments (flag, buffer, count). Make it work. 404 * Permit further arguments for the few shreds of dignity 405 * it offers. 406 * 407 * Adding commands that start with 'd', and match "delete" 408 * up to a l, p, +, - or # character can break this code. 409 * 410 * !!! 411 * Capital letters beginning the command names ex, edit, 412 * next, previous, tag and visual (in vi mode) indicate the 413 * command should happen in a new screen. 414 */ 415 switch (p[0]) { 416 case 'd': 417 for (s = p, 418 t = cmds[C_DELETE].name; *s == *t; ++s, ++t); 419 if (s[0] == 'l' || s[0] == 'p' || s[0] == '+' || 420 s[0] == '-' || s[0] == '^' || s[0] == '#') { 421 len = (ecp->cp - p) - (s - p); 422 ecp->cp -= len; 423 ecp->clen += len; 424 ecp->rcmd = cmds[C_DELETE]; 425 ecp->rcmd.syntax = "1bca1"; 426 ecp->cmd = &ecp->rcmd; 427 goto skip_srch; 428 } 429 break; 430 case 'E': case 'F': case 'N': case 'P': case 'T': case 'V': 431 newscreen = 1; 432 p[0] = tolower(p[0]); 433 break; 434 } 435 436 /* 437 * Search the table for the command. 438 * 439 * !!! 440 * Historic vi permitted the mark to immediately follow the 441 * 'k' in the 'k' command. Make it work. 442 * 443 * !!! 444 * Historic vi permitted any flag to follow the s command, e.g. 445 * "s/e/E/|s|sgc3p" was legal. Make the command "sgc" work. 446 * Since the following characters all have to be flags, i.e. 447 * alphabetics, we can let the s command routine return errors 448 * if it was some illegal command string. This code will break 449 * if an "sg" or similar command is ever added. The substitute 450 * code doesn't care if it's a "cgr" flag or a "#lp" flag that 451 * follows the 's', but we limit the choices here to "cgr" so 452 * that we get unknown command messages for wrong combinations. 453 */ 454 if ((ecp->cmd = ex_comm_search(p, namelen)) == NULL) 455 switch (p[0]) { 456 case 'k': 457 if (p[1] && !p[2]) { 458 ecp->cp -= namelen - 1; 459 ecp->clen += namelen - 1; 460 ecp->cmd = &cmds[C_K]; 461 break; 462 } 463 goto unknown; 464 case 's': 465 for (s = p + 1, cnt = namelen; --cnt; ++s) 466 if (s[0] != 'c' && 467 s[0] != 'g' && s[0] != 'r') 468 break; 469 if (cnt == 0) { 470 ecp->cp -= namelen - 1; 471 ecp->clen += namelen - 1; 472 ecp->rcmd = cmds[C_SUBSTITUTE]; 473 ecp->rcmd.fn = ex_subagain; 474 ecp->cmd = &ecp->rcmd; 475 break; 476 } 477 /* FALLTHROUGH */ 478 default: 479 unknown: if (newscreen) 480 p[0] = toupper(p[0]); 481 ex_unknown(sp, p, namelen); 482 goto err; 483 } 484 485 /* 486 * The visual command has a different syntax when called 487 * from ex than when called from a vi colon command. FMH. 488 * Make the change now, before we test for the newscreen 489 * semantic, so that we're testing the right one. 490 */ 491 skip_srch: if (ecp->cmd == &cmds[C_VISUAL_EX] && F_ISSET(sp, SC_VI)) 492 ecp->cmd = &cmds[C_VISUAL_VI]; 493 494 /* 495 * !!! 496 * Historic vi permitted a capital 'P' at the beginning of 497 * any command that started with 'p'. Probably wanted the 498 * P[rint] command for backward compatibility, and the code 499 * just made Preserve and Put work by accident. Nvi uses 500 * Previous to mean previous-in-a-new-screen, so be careful. 501 */ 502 if (newscreen && !F_ISSET(ecp->cmd, E_NEWSCREEN) && 503 (ecp->cmd == &cmds[C_PRINT] || 504 ecp->cmd == &cmds[C_PRESERVE])) 505 newscreen = 0; 506 507 /* Test for a newscreen associated with this command. */ 508 if (newscreen && !F_ISSET(ecp->cmd, E_NEWSCREEN)) 509 goto unknown; 510 511 /* Secure means no shell access. */ 512 if (F_ISSET(ecp->cmd, E_SECURE) && O_ISSET(sp, O_SECURE)) { 513 ex_emsg(sp, ecp->cmd->name, EXM_SECURE); 514 goto err; 515 } 516 517 /* 518 * Multiple < and > characters; another "feature". Note, 519 * The string passed to the underlying function may not be 520 * nul terminated in this case. 521 */ 522 if ((ecp->cmd == &cmds[C_SHIFTL] && *p == '<') || 523 (ecp->cmd == &cmds[C_SHIFTR] && *p == '>')) { 524 for (ch = *p; 525 ecp->clen > 0; --ecp->clen, ++ecp->cp) 526 if (*ecp->cp != ch) 527 break; 528 if (argv_exp0(sp, ecp, p, ecp->cp - p)) 529 goto err; 530 } 531 532 /* Set the format style flags for the next command. */ 533 if (ecp->cmd == &cmds[C_HASH]) 534 exp->fdef = E_C_HASH; 535 else if (ecp->cmd == &cmds[C_LIST]) 536 exp->fdef = E_C_LIST; 537 else if (ecp->cmd == &cmds[C_PRINT]) 538 exp->fdef = E_C_PRINT; 539 F_CLR(ecp, E_USELASTCMD); 540 } else { 541 /* Print is the default command. */ 542 ecp->cmd = &cmds[C_PRINT]; 543 544 /* Set the saved format flags. */ 545 F_SET(ecp, exp->fdef); 546 547 /* 548 * !!! 549 * If no address was specified, and it's not a global command, 550 * we up the address by one. (I have no idea why globals are 551 * exempted, but it's (ahem) historic practice.) 552 */ 553 if (ecp->addrcnt == 0 && !F_ISSET(sp, SC_EX_GLOBAL)) { 554 ecp->addrcnt = 1; 555 ecp->addr1.lno = sp->lno + 1; 556 ecp->addr1.cno = sp->cno; 557 } 558 559 F_SET(ecp, E_USELASTCMD); 560 } 561 562 /* 563 * !!! 564 * Historically, the number option applied to both ex and vi. One 565 * strangeness was that ex didn't switch display formats until a 566 * command was entered, e.g. <CR>'s after the set didn't change to 567 * the new format, but :1p would. 568 */ 569 if (O_ISSET(sp, O_NUMBER)) { 570 F_SET(ecp, E_OPTNUM); 571 FL_SET(ecp->iflags, E_C_HASH); 572 } else 573 F_CLR(ecp, E_OPTNUM); 574 575 /* Check for ex mode legality. */ 576 if (F_ISSET(sp, SC_EX) && (F_ISSET(ecp->cmd, E_VIONLY) || newscreen)) { 577 msgq(sp, M_ERR, 578 "082|%s: command not available in ex mode", ecp->cmd->name); 579 goto err; 580 } 581 582 /* Add standard command flags. */ 583 F_SET(ecp, ecp->cmd->flags); 584 if (!newscreen) 585 F_CLR(ecp, E_NEWSCREEN); 586 587 /* 588 * There are three normal termination cases for an ex command. They 589 * are the end of the string (ecp->clen), or unescaped (by <literal 590 * next> characters) <newline> or '|' characters. As we're now past 591 * possible addresses, we can determine how long the command is, so we 592 * don't have to look for all the possible terminations. Naturally, 593 * there are some exciting special cases: 594 * 595 * 1: The bang, global, v and the filter versions of the read and 596 * write commands are delimited by <newline>s (they can contain 597 * shell pipes). 598 * 2: The ex, edit, next and visual in vi mode commands all take ex 599 * commands as their first arguments. 600 * 3: The s command takes an RE as its first argument, and wants it 601 * to be specially delimited. 602 * 603 * Historically, '|' characters in the first argument of the ex, edit, 604 * next, vi visual, and s commands didn't delimit the command. And, 605 * in the filter cases for read and write, and the bang, global and v 606 * commands, they did not delimit the command at all. 607 * 608 * For example, the following commands were legal: 609 * 610 * :edit +25|s/abc/ABC/ file.c 611 * :s/|/PIPE/ 612 * :read !spell % | columnate 613 * :global/pattern/p|l 614 * 615 * It's not quite as simple as it sounds, however. The command: 616 * 617 * :s/a/b/|s/c/d|set 618 * 619 * was also legal, i.e. the historic ex parser (using the word loosely, 620 * since "parser" implies some regularity of syntax) delimited the RE's 621 * based on its delimiter and not anything so irretrievably vulgar as a 622 * command syntax. 623 * 624 * Anyhow, the following code makes this all work. First, for the 625 * special cases we move past their special argument(s). Then, we 626 * do normal command processing on whatever is left. Barf-O-Rama. 627 */ 628 arg1_len = 0; 629 ecp->save_cmd = ecp->cp; 630 if (ecp->cmd == &cmds[C_EDIT] || ecp->cmd == &cmds[C_EX] || 631 ecp->cmd == &cmds[C_NEXT] || ecp->cmd == &cmds[C_VISUAL_VI]) { 632 /* 633 * Move to the next non-whitespace character. A '!' 634 * immediately following the command is eaten as a 635 * force flag. 636 */ 637 if (ecp->clen > 0 && *ecp->cp == '!') { 638 ++ecp->cp; 639 --ecp->clen; 640 FL_SET(ecp->iflags, E_C_FORCE); 641 642 /* Reset, don't reparse. */ 643 ecp->save_cmd = ecp->cp; 644 } 645 for (; ecp->clen > 0; --ecp->clen, ++ecp->cp) 646 if (!isblank(*ecp->cp)) 647 break; 648 /* 649 * QUOTING NOTE: 650 * 651 * The historic implementation ignored all escape characters 652 * so there was no way to put a space or newline into the +cmd 653 * field. We do a simplistic job of fixing it by moving to the 654 * first whitespace character that isn't escaped. The escaping 655 * characters are stripped as no longer useful. 656 */ 657 if (ecp->clen > 0 && *ecp->cp == '+') { 658 ++ecp->cp; 659 --ecp->clen; 660 for (arg1 = p = ecp->cp; 661 ecp->clen > 0; --ecp->clen, ++ecp->cp) { 662 ch = *ecp->cp; 663 if (IS_ESCAPE(sp, ecp, ch) && 664 ecp->clen > 1) { 665 --ecp->clen; 666 ch = *++ecp->cp; 667 } else if (isblank(ch)) 668 break; 669 *p++ = ch; 670 } 671 arg1_len = ecp->cp - arg1; 672 673 /* Reset, so the first argument isn't reparsed. */ 674 ecp->save_cmd = ecp->cp; 675 } 676 } else if (ecp->cmd == &cmds[C_BANG] || 677 ecp->cmd == &cmds[C_GLOBAL] || ecp->cmd == &cmds[C_V]) { 678 for (; ecp->clen > 0; --ecp->clen, ++ecp->cp) 679 if (ecp->cp[0] == '\n') 680 break; 681 } else if (ecp->cmd == &cmds[C_READ] || ecp->cmd == &cmds[C_WRITE]) { 682 /* 683 * For write commands, if the next character is a <blank>, and 684 * the next non-blank character is a '!', it's a filter command 685 * and we want to eat everything up to the <newline>. For read 686 * commands, if the next non-blank character is a '!', it's a 687 * filter command and we want to eat everything up to the next 688 * <newline>. Otherwise, we're done. 689 */ 690 for (tmp = 0; ecp->clen > 0; --ecp->clen, ++ecp->cp) { 691 ch = *ecp->cp; 692 if (isblank(ch)) 693 tmp = 1; 694 else 695 break; 696 } 697 if (ecp->clen > 0 && ch == '!' && 698 (ecp->cmd == &cmds[C_READ] || tmp)) 699 for (; ecp->clen > 0; --ecp->clen, ++ecp->cp) 700 if (ecp->cp[0] == '\n') 701 break; 702 } else if (ecp->cmd == &cmds[C_SUBSTITUTE]) { 703 /* 704 * Move to the next non-whitespace character, we'll use it as 705 * the delimiter. If the character isn't an alphanumeric or 706 * a '|', it's the delimiter, so parse it. Otherwise, we're 707 * into something like ":s g", so use the special s command. 708 */ 709 for (; ecp->clen > 0; --ecp->clen, ++ecp->cp) 710 if (!isblank(ecp->cp[0])) 711 break; 712 713 if (isalnum(ecp->cp[0]) || ecp->cp[0] == '|') { 714 ecp->rcmd = cmds[C_SUBSTITUTE]; 715 ecp->rcmd.fn = ex_subagain; 716 ecp->cmd = &ecp->rcmd; 717 } else if (ecp->clen > 0) { 718 /* 719 * QUOTING NOTE: 720 * 721 * Backslashes quote delimiter characters for RE's. 722 * The backslashes are NOT removed since they'll be 723 * used by the RE code. Move to the third delimiter 724 * that's not escaped (or the end of the command). 725 */ 726 delim = *ecp->cp; 727 ++ecp->cp; 728 --ecp->clen; 729 for (cnt = 2; ecp->clen > 0 && 730 cnt != 0; --ecp->clen, ++ecp->cp) 731 if (ecp->cp[0] == '\\' && 732 ecp->clen > 1) { 733 ++ecp->cp; 734 --ecp->clen; 735 } else if (ecp->cp[0] == delim) 736 --cnt; 737 } 738 } 739 740 /* 741 * Use normal quoting and termination rules to find the end of this 742 * command. 743 * 744 * QUOTING NOTE: 745 * 746 * Historically, vi permitted ^V's to escape <newline>'s in the .exrc 747 * file. It was almost certainly a bug, but that's what bug-for-bug 748 * compatibility means, Grasshopper. Also, ^V's escape the command 749 * delimiters. Literal next quote characters in front of the newlines, 750 * '|' characters or literal next characters are stripped as they're 751 * no longer useful. 752 */ 753 vi_address = ecp->clen != 0 && ecp->cp[0] != '\n'; 754 for (cnt = 0, p = ecp->cp; ecp->clen > 0; --ecp->clen, ++ecp->cp) { 755 ch = ecp->cp[0]; 756 if (IS_ESCAPE(sp, ecp, ch) && ecp->clen > 1) { 757 tmp = ecp->cp[1]; 758 if (tmp == '\n' || tmp == '|') { 759 if (tmp == '\n') { 760 ++gp->if_lno; 761 ++ecp->if_lno; 762 } 763 --ecp->clen; 764 ++ecp->cp; 765 ++cnt; 766 ch = tmp; 767 } 768 } else if (ch == '\n' || ch == '|') { 769 if (ch == '\n') 770 F_SET(ecp, E_NEWLINE); 771 --ecp->clen; 772 break; 773 } 774 *p++ = ch; 775 } 776 777 /* 778 * Save off the next command information, go back to the 779 * original start of the command. 780 */ 781 p = ecp->cp + 1; 782 ecp->cp = ecp->save_cmd; 783 ecp->save_cmd = p; 784 ecp->save_cmdlen = ecp->clen; 785 ecp->clen = ((ecp->save_cmd - ecp->cp) - 1) - cnt; 786 787 /* 788 * QUOTING NOTE: 789 * 790 * The "set tags" command historically used a backslash, not the 791 * user's literal next character, to escape whitespace. Handle 792 * it here instead of complicating the argv_exp3() code. Note, 793 * this isn't a particularly complex trap, and if backslashes were 794 * legal in set commands, this would have to be much more complicated. 795 */ 796 if (ecp->cmd == &cmds[C_SET]) 797 for (p = ecp->cp, len = ecp->clen; len > 0; --len, ++p) 798 if (*p == '\\') 799 *p = CH_LITERAL; 800 801 /* 802 * Set the default addresses. It's an error to specify an address for 803 * a command that doesn't take them. If two addresses are specified 804 * for a command that only takes one, lose the first one. Two special 805 * cases here, some commands take 0 or 2 addresses. For most of them 806 * (the E_ADDR2_ALL flag), 0 defaults to the entire file. For one 807 * (the `!' command, the E_ADDR2_NONE flag), 0 defaults to no lines. 808 * 809 * Also, if the file is empty, some commands want to use an address of 810 * 0, i.e. the entire file is 0 to 0, and the default first address is 811 * 0. Otherwise, an entire file is 1 to N and the default line is 1. 812 * Note, we also add the E_ADDR_ZERO flag to the command flags, for the 813 * case where the 0 address is only valid if it's a default address. 814 * 815 * Also, set a flag if we set the default addresses. Some commands 816 * (ex: z) care if the user specified an address or if we just used 817 * the current cursor. 818 */ 819 switch (F_ISSET(ecp, E_ADDR1 | E_ADDR2 | E_ADDR2_ALL | E_ADDR2_NONE)) { 820 case E_ADDR1: /* One address: */ 821 switch (ecp->addrcnt) { 822 case 0: /* Default cursor/empty file. */ 823 ecp->addrcnt = 1; 824 F_SET(ecp, E_ADDR_DEF); 825 if (F_ISSET(ecp, E_ADDR_ZERODEF)) { 826 if (db_last(sp, &lno)) 827 goto err; 828 if (lno == 0) { 829 ecp->addr1.lno = 0; 830 F_SET(ecp, E_ADDR_ZERO); 831 } else 832 ecp->addr1.lno = sp->lno; 833 } else 834 ecp->addr1.lno = sp->lno; 835 ecp->addr1.cno = sp->cno; 836 break; 837 case 1: 838 break; 839 case 2: /* Lose the first address. */ 840 ecp->addrcnt = 1; 841 ecp->addr1 = ecp->addr2; 842 } 843 break; 844 case E_ADDR2_NONE: /* Zero/two addresses: */ 845 if (ecp->addrcnt == 0) /* Default to nothing. */ 846 break; 847 goto two_addr; 848 case E_ADDR2_ALL: /* Zero/two addresses: */ 849 if (ecp->addrcnt == 0) { /* Default entire/empty file. */ 850 F_SET(ecp, E_ADDR_DEF); 851 ecp->addrcnt = 2; 852 if (sp->ep == NULL) 853 ecp->addr2.lno = 0; 854 else if (db_last(sp, &ecp->addr2.lno)) 855 goto err; 856 if (F_ISSET(ecp, E_ADDR_ZERODEF) && 857 ecp->addr2.lno == 0) { 858 ecp->addr1.lno = 0; 859 F_SET(ecp, E_ADDR_ZERO); 860 } else 861 ecp->addr1.lno = 1; 862 ecp->addr1.cno = ecp->addr2.cno = 0; 863 F_SET(ecp, E_ADDR2_ALL); 864 break; 865 } 866 /* FALLTHROUGH */ 867 case E_ADDR2: /* Two addresses: */ 868 two_addr: switch (ecp->addrcnt) { 869 case 0: /* Default cursor/empty file. */ 870 ecp->addrcnt = 2; 871 F_SET(ecp, E_ADDR_DEF); 872 if (sp->lno == 1 && 873 F_ISSET(ecp, E_ADDR_ZERODEF)) { 874 if (db_last(sp, &lno)) 875 goto err; 876 if (lno == 0) { 877 ecp->addr1.lno = ecp->addr2.lno = 0; 878 F_SET(ecp, E_ADDR_ZERO); 879 } else 880 ecp->addr1.lno = 881 ecp->addr2.lno = sp->lno; 882 } else 883 ecp->addr1.lno = ecp->addr2.lno = sp->lno; 884 ecp->addr1.cno = ecp->addr2.cno = sp->cno; 885 break; 886 case 1: /* Default to first address. */ 887 ecp->addrcnt = 2; 888 ecp->addr2 = ecp->addr1; 889 break; 890 case 2: 891 break; 892 } 893 break; 894 default: 895 if (ecp->addrcnt) /* Error. */ 896 goto usage; 897 } 898 899 /* 900 * !!! 901 * The ^D scroll command historically scrolled the value of the scroll 902 * option or to EOF. It was an error if the cursor was already at EOF. 903 * (Leading addresses were permitted, but were then ignored.) 904 */ 905 if (ecp->cmd == &cmds[C_SCROLL]) { 906 ecp->addrcnt = 2; 907 ecp->addr1.lno = sp->lno + 1; 908 ecp->addr2.lno = sp->lno + O_VAL(sp, O_SCROLL); 909 ecp->addr1.cno = ecp->addr2.cno = sp->cno; 910 if (db_last(sp, &lno)) 911 goto err; 912 if (lno != 0 && lno > sp->lno && ecp->addr2.lno > lno) 913 ecp->addr2.lno = lno; 914 } 915 916 ecp->flagoff = 0; 917 for (p = ecp->cmd->syntax; *p != '\0'; ++p) { 918 /* 919 * The force flag is sensitive to leading whitespace, i.e. 920 * "next !" is different from "next!". Handle it before 921 * skipping leading <blank>s. 922 */ 923 if (*p == '!') { 924 if (ecp->clen > 0 && *ecp->cp == '!') { 925 ++ecp->cp; 926 --ecp->clen; 927 FL_SET(ecp->iflags, E_C_FORCE); 928 } 929 continue; 930 } 931 932 /* Skip leading <blank>s. */ 933 for (; ecp->clen > 0; --ecp->clen, ++ecp->cp) 934 if (!isblank(*ecp->cp)) 935 break; 936 if (ecp->clen == 0) 937 break; 938 939 switch (*p) { 940 case '1': /* +, -, #, l, p */ 941 /* 942 * !!! 943 * Historically, some flags were ignored depending 944 * on where they occurred in the command line. For 945 * example, in the command, ":3+++p--#", historic vi 946 * acted on the '#' flag, but ignored the '-' flags. 947 * It's unambiguous what the flags mean, so we just 948 * handle them regardless of the stupidity of their 949 * location. 950 */ 951 for (; ecp->clen; --ecp->clen, ++ecp->cp) 952 switch (*ecp->cp) { 953 case '+': 954 ++ecp->flagoff; 955 break; 956 case '-': 957 case '^': 958 --ecp->flagoff; 959 break; 960 case '#': 961 F_CLR(ecp, E_OPTNUM); 962 FL_SET(ecp->iflags, E_C_HASH); 963 exp->fdef |= E_C_HASH; 964 break; 965 case 'l': 966 FL_SET(ecp->iflags, E_C_LIST); 967 exp->fdef |= E_C_LIST; 968 break; 969 case 'p': 970 FL_SET(ecp->iflags, E_C_PRINT); 971 exp->fdef |= E_C_PRINT; 972 break; 973 default: 974 goto end_case1; 975 } 976 end_case1: break; 977 case '2': /* -, ., +, ^ */ 978 case '3': /* -, ., +, ^, = */ 979 for (; ecp->clen; --ecp->clen, ++ecp->cp) 980 switch (*ecp->cp) { 981 case '-': 982 FL_SET(ecp->iflags, E_C_DASH); 983 break; 984 case '.': 985 FL_SET(ecp->iflags, E_C_DOT); 986 break; 987 case '+': 988 FL_SET(ecp->iflags, E_C_PLUS); 989 break; 990 case '^': 991 FL_SET(ecp->iflags, E_C_CARAT); 992 break; 993 case '=': 994 if (*p == '3') { 995 FL_SET(ecp->iflags, E_C_EQUAL); 996 break; 997 } 998 /* FALLTHROUGH */ 999 default: 1000 goto end_case23; 1001 } 1002 end_case23: break; 1003 case 'b': /* buffer */ 1004 /* 1005 * !!! 1006 * Historically, "d #" was a delete with a flag, not a 1007 * delete into the '#' buffer. If the current command 1008 * permits a flag, don't use one as a buffer. However, 1009 * the 'l' and 'p' flags were legal buffer names in the 1010 * historic ex, and were used as buffers, not flags. 1011 */ 1012 if ((ecp->cp[0] == '+' || ecp->cp[0] == '-' || 1013 ecp->cp[0] == '^' || ecp->cp[0] == '#') && 1014 strchr(p, '1') != NULL) 1015 break; 1016 /* 1017 * !!! 1018 * Digits can't be buffer names in ex commands, or the 1019 * command "d2" would be a delete into buffer '2', and 1020 * not a two-line deletion. 1021 */ 1022 if (!isdigit(ecp->cp[0])) { 1023 ecp->buffer = *ecp->cp; 1024 ++ecp->cp; 1025 --ecp->clen; 1026 FL_SET(ecp->iflags, E_C_BUFFER); 1027 } 1028 break; 1029 case 'c': /* count [01+a] */ 1030 ++p; 1031 /* Validate any signed value. */ 1032 if (!isdigit(*ecp->cp) && (*p != '+' || 1033 (*ecp->cp != '+' && *ecp->cp != '-'))) 1034 break; 1035 /* If a signed value, set appropriate flags. */ 1036 if (*ecp->cp == '-') 1037 FL_SET(ecp->iflags, E_C_COUNT_NEG); 1038 else if (*ecp->cp == '+') 1039 FL_SET(ecp->iflags, E_C_COUNT_POS); 1040 if ((nret = 1041 nget_slong(<mp, ecp->cp, &t, 10)) != NUM_OK) { 1042 ex_badaddr(sp, NULL, A_NOTSET, nret); 1043 goto err; 1044 } 1045 if (ltmp == 0 && *p != '0') { 1046 msgq(sp, M_ERR, "083|Count may not be zero"); 1047 goto err; 1048 } 1049 ecp->clen -= (t - ecp->cp); 1050 ecp->cp = t; 1051 1052 /* 1053 * Counts as address offsets occur in commands taking 1054 * two addresses. Historic vi practice was to use 1055 * the count as an offset from the *second* address. 1056 * 1057 * Set a count flag; some underlying commands (see 1058 * join) do different things with counts than with 1059 * line addresses. 1060 */ 1061 if (*p == 'a') { 1062 ecp->addr1 = ecp->addr2; 1063 ecp->addr2.lno = ecp->addr1.lno + ltmp - 1; 1064 } else 1065 ecp->count = ltmp; 1066 FL_SET(ecp->iflags, E_C_COUNT); 1067 break; 1068 case 'f': /* file */ 1069 if (argv_exp2(sp, ecp, ecp->cp, ecp->clen)) 1070 goto err; 1071 goto arg_cnt_chk; 1072 case 'l': /* line */ 1073 /* 1074 * Get a line specification. 1075 * 1076 * If the line was a search expression, we may have 1077 * changed state during the call, and we're now 1078 * searching the file. Push ourselves onto the state 1079 * stack. 1080 */ 1081 if (ex_line(sp, ecp, &cur, &isaddr, &tmp)) 1082 goto rfail; 1083 if (tmp) 1084 goto err; 1085 1086 /* Line specifications are always required. */ 1087 if (!isaddr) { 1088 msgq_str(sp, M_ERR, ecp->cp, 1089 "084|%s: bad line specification"); 1090 goto err; 1091 } 1092 /* 1093 * The target line should exist for these commands, 1094 * but 0 is legal for them as well. 1095 */ 1096 if (cur.lno != 0 && !db_exist(sp, cur.lno)) { 1097 ex_badaddr(sp, NULL, A_EOF, NUM_OK); 1098 goto err; 1099 } 1100 ecp->lineno = cur.lno; 1101 break; 1102 case 'S': /* string, file exp. */ 1103 if (ecp->clen != 0) { 1104 if (argv_exp1(sp, ecp, ecp->cp, 1105 ecp->clen, ecp->cmd == &cmds[C_BANG])) 1106 goto err; 1107 goto addr_verify; 1108 } 1109 /* FALLTHROUGH */ 1110 case 's': /* string */ 1111 if (argv_exp0(sp, ecp, ecp->cp, ecp->clen)) 1112 goto err; 1113 goto addr_verify; 1114 case 'W': /* word string */ 1115 /* 1116 * QUOTING NOTE: 1117 * 1118 * Literal next characters escape the following 1119 * character. Quoting characters are stripped here 1120 * since they are no longer useful. 1121 * 1122 * First there was the word. 1123 */ 1124 for (p = t = ecp->cp; 1125 ecp->clen > 0; --ecp->clen, ++ecp->cp) { 1126 ch = *ecp->cp; 1127 if (IS_ESCAPE(sp, 1128 ecp, ch) && ecp->clen > 1) { 1129 --ecp->clen; 1130 *p++ = *++ecp->cp; 1131 } else if (isblank(ch)) { 1132 ++ecp->cp; 1133 --ecp->clen; 1134 break; 1135 } else 1136 *p++ = ch; 1137 } 1138 if (argv_exp0(sp, ecp, t, p - t)) 1139 goto err; 1140 1141 /* Delete intervening whitespace. */ 1142 for (; ecp->clen > 0; 1143 --ecp->clen, ++ecp->cp) { 1144 ch = *ecp->cp; 1145 if (!isblank(ch)) 1146 break; 1147 } 1148 if (ecp->clen == 0) 1149 goto usage; 1150 1151 /* Followed by the string. */ 1152 for (p = t = ecp->cp; ecp->clen > 0; 1153 --ecp->clen, ++ecp->cp, ++p) { 1154 ch = *ecp->cp; 1155 if (IS_ESCAPE(sp, 1156 ecp, ch) && ecp->clen > 1) { 1157 --ecp->clen; 1158 *p = *++ecp->cp; 1159 } else 1160 *p = ch; 1161 } 1162 if (argv_exp0(sp, ecp, t, p - t)) 1163 goto err; 1164 goto addr_verify; 1165 case 'w': /* word */ 1166 if (argv_exp3(sp, ecp, ecp->cp, ecp->clen)) 1167 goto err; 1168 arg_cnt_chk: if (*++p != 'N') { /* N */ 1169 /* 1170 * If a number is specified, must either be 1171 * 0 or that number, if optional, and that 1172 * number, if required. 1173 */ 1174 tmp = *p - '0'; 1175 if ((*++p != 'o' || exp->argsoff != 0) && 1176 exp->argsoff != tmp) 1177 goto usage; 1178 } 1179 goto addr_verify; 1180 default: 1181 msgq(sp, M_ERR, 1182 "085|Internal syntax table error (%s: %s)", 1183 ecp->cmd->name, KEY_NAME(sp, *p)); 1184 } 1185 } 1186 1187 /* Skip trailing whitespace. */ 1188 for (; ecp->clen > 0; --ecp->clen) { 1189 ch = *ecp->cp++; 1190 if (!isblank(ch)) 1191 break; 1192 } 1193 1194 /* 1195 * There shouldn't be anything left, and no more required fields, 1196 * i.e neither 'l' or 'r' in the syntax string. 1197 */ 1198 if (ecp->clen != 0 || strpbrk(p, "lr")) { 1199 usage: msgq(sp, M_ERR, "086|Usage: %s", ecp->cmd->usage); 1200 goto err; 1201 } 1202 1203 /* 1204 * Verify that the addresses are legal. Check the addresses here, 1205 * because this is a place where all ex addresses pass through. 1206 * (They don't all pass through ex_line(), for instance.) We're 1207 * assuming that any non-existent line doesn't exist because it's 1208 * past the end-of-file. That's a pretty good guess. 1209 * 1210 * If it's a "default vi command", an address of zero is okay. 1211 */ 1212 addr_verify: 1213 switch (ecp->addrcnt) { 1214 case 2: 1215 /* 1216 * Historic ex/vi permitted commands with counts to go past 1217 * EOF. So, for example, if the file only had 5 lines, the 1218 * ex command "1,6>" would fail, but the command ">300" 1219 * would succeed. Since we don't want to have to make all 1220 * of the underlying commands handle random line numbers, 1221 * fix it here. 1222 */ 1223 if (ecp->addr2.lno == 0) { 1224 if (!F_ISSET(ecp, E_ADDR_ZERO) && 1225 (F_ISSET(sp, SC_EX) || 1226 !F_ISSET(ecp, E_USELASTCMD))) { 1227 ex_badaddr(sp, ecp->cmd, A_ZERO, NUM_OK); 1228 goto err; 1229 } 1230 } else if (!db_exist(sp, ecp->addr2.lno)) 1231 if (FL_ISSET(ecp->iflags, E_C_COUNT)) { 1232 if (db_last(sp, &lno)) 1233 goto err; 1234 ecp->addr2.lno = lno; 1235 } else { 1236 ex_badaddr(sp, NULL, A_EOF, NUM_OK); 1237 goto err; 1238 } 1239 /* FALLTHROUGH */ 1240 case 1: 1241 if (ecp->addr1.lno == 0) { 1242 if (!F_ISSET(ecp, E_ADDR_ZERO) && 1243 (F_ISSET(sp, SC_EX) || 1244 !F_ISSET(ecp, E_USELASTCMD))) { 1245 ex_badaddr(sp, ecp->cmd, A_ZERO, NUM_OK); 1246 goto err; 1247 } 1248 } else if (!db_exist(sp, ecp->addr1.lno)) { 1249 ex_badaddr(sp, NULL, A_EOF, NUM_OK); 1250 goto err; 1251 } 1252 break; 1253 } 1254 1255 /* 1256 * If doing a default command and there's nothing left on the line, 1257 * vi just moves to the line. For example, ":3" and ":'a,'b" just 1258 * move to line 3 and line 'b, respectively, but ":3|" prints line 3. 1259 * 1260 * !!! 1261 * In addition, IF THE LINE CHANGES, move to the first nonblank of 1262 * the line. 1263 * 1264 * !!! 1265 * This is done before the absolute mark gets set; historically, 1266 * "/a/,/b/" did NOT set vi's absolute mark, but "/a/,/b/d" did. 1267 */ 1268 if ((F_ISSET(sp, SC_VI) || F_ISSET(ecp, E_NOPRDEF)) && 1269 F_ISSET(ecp, E_USELASTCMD) && vi_address == 0) { 1270 switch (ecp->addrcnt) { 1271 case 2: 1272 if (sp->lno != 1273 (ecp->addr2.lno ? ecp->addr2.lno : 1)) { 1274 sp->lno = 1275 ecp->addr2.lno ? ecp->addr2.lno : 1; 1276 sp->cno = 0; 1277 (void)nonblank(sp, sp->lno, &sp->cno); 1278 } 1279 break; 1280 case 1: 1281 if (sp->lno != 1282 (ecp->addr1.lno ? ecp->addr1.lno : 1)) { 1283 sp->lno = 1284 ecp->addr1.lno ? ecp->addr1.lno : 1; 1285 sp->cno = 0; 1286 (void)nonblank(sp, sp->lno, &sp->cno); 1287 } 1288 break; 1289 } 1290 ecp->cp = ecp->save_cmd; 1291 ecp->clen = ecp->save_cmdlen; 1292 goto loop; 1293 } 1294 1295 /* 1296 * Set the absolute mark -- we have to set it for vi here, in case 1297 * it's a compound command, e.g. ":5p|6" should set the absolute 1298 * mark for vi. 1299 */ 1300 if (F_ISSET(ecp, E_ABSMARK)) { 1301 cur.lno = sp->lno; 1302 cur.cno = sp->cno; 1303 F_CLR(ecp, E_ABSMARK); 1304 if (mark_set(sp, ABSMARK1, &cur, 1)) 1305 goto err; 1306 } 1307 1308 #if defined(DEBUG) && defined(COMLOG) 1309 ex_comlog(sp, ecp); 1310 #endif 1311 /* Increment the command count if not called from vi. */ 1312 if (F_ISSET(sp, SC_EX)) 1313 ++sp->ccnt; 1314 1315 /* 1316 * If file state available, and not doing a global command, 1317 * log the start of an action. 1318 */ 1319 if (sp->ep != NULL && !F_ISSET(sp, SC_EX_GLOBAL)) 1320 (void)log_cursor(sp); 1321 1322 /* 1323 * !!! 1324 * There are two special commands for the purposes of this code: the 1325 * default command (<carriage-return>) or the scrolling commands (^D 1326 * and <EOF>) as the first non-<blank> characters in the line. 1327 * 1328 * If this is the first command in the command line, we received the 1329 * command from the ex command loop and we're talking to a tty, and 1330 * and there's nothing else on the command line, and it's one of the 1331 * special commands, we move back up to the previous line, and erase 1332 * the prompt character with the output. Since ex runs in canonical 1333 * mode, we don't have to do anything else, a <newline> has already 1334 * been echoed by the tty driver. It's OK if vi calls us -- we won't 1335 * be in ex mode so we'll do nothing. 1336 */ 1337 if (F_ISSET(ecp, E_NRSEP)) { 1338 if (sp->ep != NULL && 1339 F_ISSET(sp, SC_EX) && !F_ISSET(gp, G_SCRIPTED) && 1340 (F_ISSET(ecp, E_USELASTCMD) || ecp->cmd == &cmds[C_SCROLL])) 1341 gp->scr_ex_adjust(sp, EX_TERM_SCROLL); 1342 F_CLR(ecp, E_NRSEP); 1343 } 1344 1345 /* 1346 * Call the underlying function for the ex command. 1347 * 1348 * XXX 1349 * Interrupts behave like errors, for now. 1350 */ 1351 if (ecp->cmd->fn(sp, ecp) || INTERRUPTED(sp)) { 1352 if (F_ISSET(gp, G_SCRIPTED)) 1353 F_SET(sp, SC_EXIT_FORCE); 1354 goto err; 1355 } 1356 1357 #ifdef DEBUG 1358 /* Make sure no function left global temporary space locked. */ 1359 if (F_ISSET(gp, G_TMP_INUSE)) { 1360 F_CLR(gp, G_TMP_INUSE); 1361 msgq(sp, M_ERR, "087|%s: temporary buffer not released", 1362 ecp->cmd->name); 1363 } 1364 #endif 1365 /* 1366 * Ex displayed the number of lines modified immediately after each 1367 * command, so the command "1,10d|1,10d" would display: 1368 * 1369 * 10 lines deleted 1370 * 10 lines deleted 1371 * <autoprint line> 1372 * 1373 * Executing ex commands from vi only reported the final modified 1374 * lines message -- that's wrong enough that we don't match it. 1375 */ 1376 if (F_ISSET(sp, SC_EX)) 1377 mod_rpt(sp); 1378 1379 /* 1380 * Integrate any offset parsed by the underlying command, and make 1381 * sure the referenced line exists. 1382 * 1383 * XXX 1384 * May not match historic practice (which I've never been able to 1385 * completely figure out.) For example, the '=' command from vi 1386 * mode often got the offset wrong, and complained it was too large, 1387 * but didn't seem to have a problem with the cursor. If anyone 1388 * complains, ask them how it's supposed to work, they might know. 1389 */ 1390 if (sp->ep != NULL && ecp->flagoff) { 1391 if (ecp->flagoff < 0) { 1392 if (sp->lno <= -ecp->flagoff) { 1393 msgq(sp, M_ERR, 1394 "088|Flag offset to before line 1"); 1395 goto err; 1396 } 1397 } else { 1398 if (!NPFITS(MAX_REC_NUMBER, sp->lno, ecp->flagoff)) { 1399 ex_badaddr(sp, NULL, A_NOTSET, NUM_OVER); 1400 goto err; 1401 } 1402 if (!db_exist(sp, sp->lno + ecp->flagoff)) { 1403 msgq(sp, M_ERR, 1404 "089|Flag offset past end-of-file"); 1405 goto err; 1406 } 1407 } 1408 sp->lno += ecp->flagoff; 1409 } 1410 1411 /* 1412 * If the command executed successfully, we may want to display a line 1413 * based on the autoprint option or an explicit print flag. (Make sure 1414 * that there's a line to display.) Also, the autoprint edit option is 1415 * turned off for the duration of global commands. 1416 */ 1417 if (F_ISSET(sp, SC_EX) && sp->ep != NULL && sp->lno != 0) { 1418 /* 1419 * The print commands have already handled the `print' flags. 1420 * If so, clear them. 1421 */ 1422 if (FL_ISSET(ecp->iflags, E_CLRFLAG)) 1423 FL_CLR(ecp->iflags, E_C_HASH | E_C_LIST | E_C_PRINT); 1424 1425 /* If hash set only because of the number option, discard it. */ 1426 if (F_ISSET(ecp, E_OPTNUM)) 1427 FL_CLR(ecp->iflags, E_C_HASH); 1428 1429 /* 1430 * If there was an explicit flag to display the new cursor line, 1431 * or autoprint is set and a change was made, display the line. 1432 * If any print flags were set use them, else default to print. 1433 */ 1434 LF_INIT(FL_ISSET(ecp->iflags, E_C_HASH | E_C_LIST | E_C_PRINT)); 1435 if (!LF_ISSET(E_C_HASH | E_C_LIST | E_C_PRINT | E_NOAUTO) && 1436 !F_ISSET(sp, SC_EX_GLOBAL) && 1437 O_ISSET(sp, O_AUTOPRINT) && F_ISSET(ecp, E_AUTOPRINT)) 1438 LF_INIT(E_C_PRINT); 1439 1440 if (LF_ISSET(E_C_HASH | E_C_LIST | E_C_PRINT)) { 1441 cur.lno = sp->lno; 1442 cur.cno = 0; 1443 (void)ex_print(sp, ecp, &cur, &cur, flags); 1444 } 1445 } 1446 1447 /* 1448 * If the command had an associated "+cmd", it has to be executed 1449 * before we finish executing any more of this ex command. For 1450 * example, consider a .exrc file that contains the following lines: 1451 * 1452 * :set all 1453 * :edit +25 file.c|s/abc/ABC/|1 1454 * :3,5 print 1455 * 1456 * This can happen more than once -- the historic vi simply hung or 1457 * dropped core, of course. Prepend the + command back into the 1458 * current command and continue. We may have to add an additional 1459 * <literal next> character. We know that it will fit because we 1460 * discarded at least one space and the + character. 1461 */ 1462 if (arg1_len != 0) { 1463 /* 1464 * If the last character of the + command was a <literal next> 1465 * character, it would be treated differently because of the 1466 * append. Quote it, if necessary. 1467 */ 1468 if (IS_ESCAPE(sp, ecp, arg1[arg1_len - 1])) { 1469 *--ecp->save_cmd = CH_LITERAL; 1470 ++ecp->save_cmdlen; 1471 } 1472 1473 ecp->save_cmd -= arg1_len; 1474 ecp->save_cmdlen += arg1_len; 1475 memcpy(ecp->save_cmd, arg1, arg1_len); 1476 1477 /* 1478 * Any commands executed from a +cmd are executed starting at 1479 * the first column of the last line of the file -- NOT the 1480 * first nonblank.) The main file startup code doesn't know 1481 * that a +cmd was set, however, so it may have put us at the 1482 * top of the file. (Note, this is safe because we must have 1483 * switched files to get here.) 1484 */ 1485 F_SET(ecp, E_MOVETOEND); 1486 } 1487 1488 /* Update the current command. */ 1489 ecp->cp = ecp->save_cmd; 1490 ecp->clen = ecp->save_cmdlen; 1491 1492 /* 1493 * !!! 1494 * If we've changed screens or underlying files, any pending global or 1495 * v command, or @ buffer that has associated addresses, has to be 1496 * discarded. This is historic practice for globals, and necessary for 1497 * @ buffers that had associated addresses. 1498 * 1499 * Otherwise, if we've changed underlying files, it's not a problem, 1500 * we continue with the rest of the ex command(s), operating on the 1501 * new file. However, if we switch screens (either by exiting or by 1502 * an explicit command), we have no way of knowing where to put output 1503 * messages, and, since we don't control screens here, we could screw 1504 * up the upper layers, (e.g. we could exit/reenter a screen multiple 1505 * times). So, return and continue after we've got a new screen. 1506 */ 1507 if (F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE | SC_FSWITCH | SC_SSWITCH)) { 1508 at_found = gv_found = 0; 1509 for (ecp = sp->gp->ecq.lh_first; 1510 ecp != NULL; ecp = ecp->q.le_next) 1511 switch (ecp->agv_flags) { 1512 case 0: 1513 case AGV_AT_NORANGE: 1514 break; 1515 case AGV_AT: 1516 if (!at_found) { 1517 at_found = 1; 1518 msgq(sp, M_ERR, 1519 "090|@ with range running when the file/screen changed"); 1520 } 1521 break; 1522 case AGV_GLOBAL: 1523 case AGV_V: 1524 if (!gv_found) { 1525 gv_found = 1; 1526 msgq(sp, M_ERR, 1527 "091|Global/v command running when the file/screen changed"); 1528 } 1529 break; 1530 default: 1531 abort(); 1532 } 1533 if (at_found || gv_found) 1534 goto discard; 1535 if (F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE | SC_SSWITCH)) 1536 goto rsuccess; 1537 } 1538 1539 goto loop; 1540 /* NOTREACHED */ 1541 1542 err: /* 1543 * On command failure, we discard keys and pending commands remaining, 1544 * as well as any keys that were mapped and waiting. The save_cmdlen 1545 * test is not necessarily correct. If we fail early enough we don't 1546 * know if the entire string was a single command or not. Guess, as 1547 * it's useful to know if commands other than the current one are being 1548 * discarded. 1549 */ 1550 if (ecp->save_cmdlen == 0) 1551 for (; ecp->clen; --ecp->clen) { 1552 ch = *ecp->cp++; 1553 if (IS_ESCAPE(sp, ecp, ch) && ecp->clen > 1) { 1554 --ecp->clen; 1555 ++ecp->cp; 1556 } else if (ch == '\n' || ch == '|') { 1557 if (ecp->clen > 1) 1558 ecp->save_cmdlen = 1; 1559 break; 1560 } 1561 } 1562 if (ecp->save_cmdlen != 0 || gp->ecq.lh_first != &gp->excmd) { 1563 discard: msgq(sp, M_BERR, 1564 "092|Ex command failed: pending commands discarded"); 1565 ex_discard(sp); 1566 } 1567 if (v_event_flush(sp, CH_MAPPED)) 1568 msgq(sp, M_BERR, 1569 "093|Ex command failed: mapped keys discarded"); 1570 1571 rfail: tmp = 1; 1572 if (0) 1573 rsuccess: tmp = 0; 1574 1575 /* Turn off any file name error information. */ 1576 gp->if_name = NULL; 1577 1578 /* Turn off the global bit. */ 1579 F_CLR(sp, SC_EX_GLOBAL); 1580 1581 return (tmp); 1582 } 1583 1584 /* 1585 * ex_range -- 1586 * Get a line range for ex commands, or perform a vi ex address search. 1587 * 1588 * PUBLIC: int ex_range __P((SCR *, EXCMD *, int *)); 1589 */ 1590 int 1591 ex_range(sp, ecp, errp) 1592 SCR *sp; 1593 EXCMD *ecp; 1594 int *errp; 1595 { 1596 enum { ADDR_FOUND, ADDR_NEED, ADDR_NONE } addr; 1597 GS *gp; 1598 EX_PRIVATE *exp; 1599 MARK m; 1600 int isaddr; 1601 1602 *errp = 0; 1603 1604 /* 1605 * Parse comma or semi-colon delimited line specs. 1606 * 1607 * Semi-colon delimiters update the current address to be the last 1608 * address. For example, the command 1609 * 1610 * :3;/pattern/ecp->cp 1611 * 1612 * will search for pattern from line 3. In addition, if ecp->cp 1613 * is not a valid command, the current line will be left at 3, not 1614 * at the original address. 1615 * 1616 * Extra addresses are discarded, starting with the first. 1617 * 1618 * !!! 1619 * If any addresses are missing, they default to the current line. 1620 * This was historically true for both leading and trailing comma 1621 * delimited addresses as well as for trailing semicolon delimited 1622 * addresses. For consistency, we make it true for leading semicolon 1623 * addresses as well. 1624 */ 1625 gp = sp->gp; 1626 exp = EXP(sp); 1627 for (addr = ADDR_NONE, ecp->addrcnt = 0; ecp->clen > 0;) 1628 switch (*ecp->cp) { 1629 case '%': /* Entire file. */ 1630 /* Vi ex address searches didn't permit % signs. */ 1631 if (F_ISSET(ecp, E_VISEARCH)) 1632 goto ret; 1633 1634 /* It's an error if the file is empty. */ 1635 if (sp->ep == NULL) { 1636 ex_badaddr(sp, NULL, A_EMPTY, NUM_OK); 1637 *errp = 1; 1638 return (0); 1639 } 1640 /* 1641 * !!! 1642 * A percent character addresses all of the lines in 1643 * the file. Historically, it couldn't be followed by 1644 * any other address. We do it as a text substitution 1645 * for simplicity. POSIX 1003.2 is expected to follow 1646 * this practice. 1647 * 1648 * If it's an empty file, the first line is 0, not 1. 1649 */ 1650 if (addr == ADDR_FOUND) { 1651 ex_badaddr(sp, NULL, A_COMBO, NUM_OK); 1652 *errp = 1; 1653 return (0); 1654 } 1655 if (db_last(sp, &ecp->addr2.lno)) 1656 return (1); 1657 ecp->addr1.lno = ecp->addr2.lno == 0 ? 0 : 1; 1658 ecp->addr1.cno = ecp->addr2.cno = 0; 1659 ecp->addrcnt = 2; 1660 addr = ADDR_FOUND; 1661 ++ecp->cp; 1662 --ecp->clen; 1663 break; 1664 case ',': /* Comma delimiter. */ 1665 /* Vi ex address searches didn't permit commas. */ 1666 if (F_ISSET(ecp, E_VISEARCH)) 1667 goto ret; 1668 /* FALLTHROUGH */ 1669 case ';': /* Semi-colon delimiter. */ 1670 if (sp->ep == NULL) { 1671 ex_badaddr(sp, NULL, A_EMPTY, NUM_OK); 1672 *errp = 1; 1673 return (0); 1674 } 1675 if (addr != ADDR_FOUND) 1676 switch (ecp->addrcnt) { 1677 case 0: 1678 ecp->addr1.lno = sp->lno; 1679 ecp->addr1.cno = sp->cno; 1680 ecp->addrcnt = 1; 1681 break; 1682 case 2: 1683 ecp->addr1 = ecp->addr2; 1684 /* FALLTHROUGH */ 1685 case 1: 1686 ecp->addr2.lno = sp->lno; 1687 ecp->addr2.cno = sp->cno; 1688 ecp->addrcnt = 2; 1689 break; 1690 } 1691 if (*ecp->cp == ';') 1692 switch (ecp->addrcnt) { 1693 case 0: 1694 abort(); 1695 /* NOTREACHED */ 1696 case 1: 1697 sp->lno = ecp->addr1.lno; 1698 sp->cno = ecp->addr1.cno; 1699 break; 1700 case 2: 1701 sp->lno = ecp->addr2.lno; 1702 sp->cno = ecp->addr2.cno; 1703 break; 1704 } 1705 addr = ADDR_NEED; 1706 /* FALLTHROUGH */ 1707 case ' ': /* Whitespace. */ 1708 case '\t': /* Whitespace. */ 1709 ++ecp->cp; 1710 --ecp->clen; 1711 break; 1712 default: 1713 /* Get a line specification. */ 1714 if (ex_line(sp, ecp, &m, &isaddr, errp)) 1715 return (1); 1716 if (*errp) 1717 return (0); 1718 if (!isaddr) 1719 goto ret; 1720 if (addr == ADDR_FOUND) { 1721 ex_badaddr(sp, NULL, A_COMBO, NUM_OK); 1722 *errp = 1; 1723 return (0); 1724 } 1725 switch (ecp->addrcnt) { 1726 case 0: 1727 ecp->addr1 = m; 1728 ecp->addrcnt = 1; 1729 break; 1730 case 1: 1731 ecp->addr2 = m; 1732 ecp->addrcnt = 2; 1733 break; 1734 case 2: 1735 ecp->addr1 = ecp->addr2; 1736 ecp->addr2 = m; 1737 break; 1738 } 1739 addr = ADDR_FOUND; 1740 break; 1741 } 1742 1743 /* 1744 * !!! 1745 * Vi ex address searches are indifferent to order or trailing 1746 * semi-colons. 1747 */ 1748 ret: if (F_ISSET(ecp, E_VISEARCH)) 1749 return (0); 1750 1751 if (addr == ADDR_NEED) 1752 switch (ecp->addrcnt) { 1753 case 0: 1754 ecp->addr1.lno = sp->lno; 1755 ecp->addr1.cno = sp->cno; 1756 ecp->addrcnt = 1; 1757 break; 1758 case 2: 1759 ecp->addr1 = ecp->addr2; 1760 /* FALLTHROUGH */ 1761 case 1: 1762 ecp->addr2.lno = sp->lno; 1763 ecp->addr2.cno = sp->cno; 1764 ecp->addrcnt = 2; 1765 break; 1766 } 1767 1768 if (ecp->addrcnt == 2 && ecp->addr2.lno < ecp->addr1.lno) { 1769 msgq(sp, M_ERR, 1770 "094|The second address is smaller than the first"); 1771 *errp = 1; 1772 } 1773 return (0); 1774 } 1775 1776 /* 1777 * ex_line -- 1778 * Get a single line address specifier. 1779 * 1780 * The way the "previous context" mark worked was that any "non-relative" 1781 * motion set it. While ex/vi wasn't totally consistent about this, ANY 1782 * numeric address, search pattern, '$', or mark reference in an address 1783 * was considered non-relative, and set the value. Which should explain 1784 * why we're hacking marks down here. The problem was that the mark was 1785 * only set if the command was called, i.e. we have to set a flag and test 1786 * it later. 1787 * 1788 * XXX 1789 * This is probably still not exactly historic practice, although I think 1790 * it's fairly close. 1791 */ 1792 static int 1793 ex_line(sp, ecp, mp, isaddrp, errp) 1794 SCR *sp; 1795 EXCMD *ecp; 1796 MARK *mp; 1797 int *isaddrp, *errp; 1798 { 1799 enum nresult nret; 1800 EX_PRIVATE *exp; 1801 GS *gp; 1802 long total, val; 1803 int isneg; 1804 int (*sf) __P((SCR *, MARK *, MARK *, char *, size_t, char **, u_int)); 1805 char *endp; 1806 1807 gp = sp->gp; 1808 exp = EXP(sp); 1809 1810 *isaddrp = *errp = 0; 1811 F_CLR(ecp, E_DELTA); 1812 1813 /* No addresses permitted until a file has been read in. */ 1814 if (sp->ep == NULL && strchr("$0123456789'\\/?.+-^", *ecp->cp)) { 1815 ex_badaddr(sp, NULL, A_EMPTY, NUM_OK); 1816 *errp = 1; 1817 return (0); 1818 } 1819 1820 switch (*ecp->cp) { 1821 case '$': /* Last line in the file. */ 1822 *isaddrp = 1; 1823 F_SET(ecp, E_ABSMARK); 1824 1825 mp->cno = 0; 1826 if (db_last(sp, &mp->lno)) 1827 return (1); 1828 ++ecp->cp; 1829 --ecp->clen; 1830 break; /* Absolute line number. */ 1831 case '0': case '1': case '2': case '3': case '4': 1832 case '5': case '6': case '7': case '8': case '9': 1833 *isaddrp = 1; 1834 F_SET(ecp, E_ABSMARK); 1835 1836 if ((nret = nget_slong(&val, ecp->cp, &endp, 10)) != NUM_OK) { 1837 ex_badaddr(sp, NULL, A_NOTSET, nret); 1838 *errp = 1; 1839 return (0); 1840 } 1841 if (!NPFITS(MAX_REC_NUMBER, 0, val)) { 1842 ex_badaddr(sp, NULL, A_NOTSET, NUM_OVER); 1843 *errp = 1; 1844 return (0); 1845 } 1846 mp->lno = val; 1847 mp->cno = 0; 1848 ecp->clen -= (endp - ecp->cp); 1849 ecp->cp = endp; 1850 break; 1851 case '\'': /* Use a mark. */ 1852 *isaddrp = 1; 1853 F_SET(ecp, E_ABSMARK); 1854 1855 if (ecp->clen == 1) { 1856 msgq(sp, M_ERR, "095|No mark name supplied"); 1857 *errp = 1; 1858 return (0); 1859 } 1860 if (mark_get(sp, ecp->cp[1], mp, M_ERR)) { 1861 *errp = 1; 1862 return (0); 1863 } 1864 ecp->cp += 2; 1865 ecp->clen -= 2; 1866 break; 1867 case '\\': /* Search: forward/backward. */ 1868 /* 1869 * !!! 1870 * I can't find any difference between // and \/ or between 1871 * ?? and \?. Mark Horton doesn't remember there being any 1872 * difference. C'est la vie. 1873 */ 1874 if (ecp->clen < 2 || 1875 ecp->cp[1] != '/' && ecp->cp[1] != '?') { 1876 msgq(sp, M_ERR, "096|\\ not followed by / or ?"); 1877 *errp = 1; 1878 return (0); 1879 } 1880 ++ecp->cp; 1881 --ecp->clen; 1882 sf = ecp->cp[0] == '/' ? f_search : b_search; 1883 goto search; 1884 case '/': /* Search forward. */ 1885 sf = f_search; 1886 goto search; 1887 case '?': /* Search backward. */ 1888 sf = b_search; 1889 1890 search: mp->lno = sp->lno; 1891 mp->cno = sp->cno; 1892 if (sf(sp, mp, mp, ecp->cp, ecp->clen, &endp, 1893 SEARCH_MSG | SEARCH_PARSE | SEARCH_SET | 1894 (F_ISSET(ecp, E_SEARCH_WMSG) ? SEARCH_WMSG : 0))) { 1895 *errp = 1; 1896 return (0); 1897 } 1898 1899 /* Fix up the command pointers. */ 1900 ecp->clen -= (endp - ecp->cp); 1901 ecp->cp = endp; 1902 1903 *isaddrp = 1; 1904 F_SET(ecp, E_ABSMARK); 1905 break; 1906 case '.': /* Current position. */ 1907 *isaddrp = 1; 1908 mp->cno = sp->cno; 1909 1910 /* If an empty file, then '.' is 0, not 1. */ 1911 if (sp->lno == 1) { 1912 if (db_last(sp, &mp->lno)) 1913 return (1); 1914 if (mp->lno != 0) 1915 mp->lno = 1; 1916 } else 1917 mp->lno = sp->lno; 1918 1919 /* 1920 * !!! 1921 * Historically, .<number> was the same as .+<number>, i.e. 1922 * the '+' could be omitted. (This feature is found in ed 1923 * as well.) 1924 */ 1925 if (ecp->clen > 1 && isdigit(ecp->cp[1])) 1926 *ecp->cp = '+'; 1927 else { 1928 ++ecp->cp; 1929 --ecp->clen; 1930 } 1931 break; 1932 } 1933 1934 /* Skip trailing <blank>s. */ 1935 for (; ecp->clen > 0 && 1936 isblank(ecp->cp[0]); ++ecp->cp, --ecp->clen); 1937 1938 /* 1939 * Evaluate any offset. If no address yet found, the offset 1940 * is relative to ".". 1941 */ 1942 total = 0; 1943 if (ecp->clen != 0 && (isdigit(ecp->cp[0]) || 1944 ecp->cp[0] == '+' || ecp->cp[0] == '-' || 1945 ecp->cp[0] == '^')) { 1946 if (!*isaddrp) { 1947 *isaddrp = 1; 1948 mp->lno = sp->lno; 1949 mp->cno = sp->cno; 1950 } 1951 /* 1952 * Evaluate an offset, defined as: 1953 * 1954 * [+-^<blank>]*[<blank>]*[0-9]* 1955 * 1956 * The rough translation is any number of signs, optionally 1957 * followed by numbers, or a number by itself, all <blank> 1958 * separated. 1959 * 1960 * !!! 1961 * All address offsets were additive, e.g. "2 2 3p" was the 1962 * same as "7p", or, "/ZZZ/ 2" was the same as "/ZZZ/+2". 1963 * Note, however, "2 /ZZZ/" was an error. It was also legal 1964 * to insert signs without numbers, so "3 - 2" was legal, and 1965 * equal to 4. 1966 * 1967 * !!! 1968 * Offsets were historically permitted for any line address, 1969 * e.g. the command "1,2 copy 2 2 2 2" copied lines 1,2 after 1970 * line 8. 1971 * 1972 * !!! 1973 * Offsets were historically permitted for search commands, 1974 * and handled as addresses: "/pattern/2 2 2" was legal, and 1975 * referenced the 6th line after pattern. 1976 */ 1977 F_SET(ecp, E_DELTA); 1978 for (;;) { 1979 for (; ecp->clen > 0 && isblank(ecp->cp[0]); 1980 ++ecp->cp, --ecp->clen); 1981 if (ecp->clen == 0 || !isdigit(ecp->cp[0]) && 1982 ecp->cp[0] != '+' && ecp->cp[0] != '-' && 1983 ecp->cp[0] != '^') 1984 break; 1985 if (!isdigit(ecp->cp[0]) && 1986 !isdigit(ecp->cp[1])) { 1987 total += ecp->cp[0] == '+' ? 1 : -1; 1988 --ecp->clen; 1989 ++ecp->cp; 1990 } else { 1991 if (ecp->cp[0] == '-' || 1992 ecp->cp[0] == '^') { 1993 ++ecp->cp; 1994 --ecp->clen; 1995 isneg = 1; 1996 } else 1997 isneg = 0; 1998 1999 /* Get a signed long, add it to the total. */ 2000 if ((nret = nget_slong(&val, 2001 ecp->cp, &endp, 10)) != NUM_OK || 2002 (nret = NADD_SLONG(sp, 2003 total, val)) != NUM_OK) { 2004 ex_badaddr(sp, NULL, A_NOTSET, nret); 2005 *errp = 1; 2006 return (0); 2007 } 2008 total += isneg ? -val : val; 2009 ecp->clen -= (endp - ecp->cp); 2010 ecp->cp = endp; 2011 } 2012 } 2013 } 2014 2015 /* 2016 * Any value less than 0 is an error. Make sure that the new value 2017 * will fit into a recno_t. 2018 */ 2019 if (*isaddrp && total != 0) { 2020 if (total < 0) { 2021 if (-total > mp->lno) { 2022 msgq(sp, M_ERR, 2023 "097|Reference to a line number less than 0"); 2024 *errp = 1; 2025 return (0); 2026 } 2027 } else 2028 if (!NPFITS(MAX_REC_NUMBER, mp->lno, total)) { 2029 ex_badaddr(sp, NULL, A_NOTSET, NUM_OVER); 2030 *errp = 1; 2031 return (0); 2032 } 2033 mp->lno += total; 2034 } 2035 return (0); 2036 } 2037 2038 2039 /* 2040 * ex_load -- 2041 * Load up the next command, which may be an @ buffer or global command. 2042 */ 2043 static int 2044 ex_load(sp) 2045 SCR *sp; 2046 { 2047 GS *gp; 2048 EXCMD *ecp; 2049 RANGE *rp; 2050 2051 F_CLR(sp, SC_EX_GLOBAL); 2052 2053 /* 2054 * Lose any exhausted commands. We know that the first command 2055 * can't be an AGV command, which makes things a bit easier. 2056 */ 2057 for (gp = sp->gp;;) { 2058 /* 2059 * If we're back to the original structure, leave it around, 2060 * but discard any allocated source name, we've returned to 2061 * the beginning of the command stack. 2062 */ 2063 if ((ecp = gp->ecq.lh_first) == &gp->excmd) { 2064 if (F_ISSET(ecp, E_NAMEDISCARD)) { 2065 free(ecp->if_name); 2066 ecp->if_name = NULL; 2067 } 2068 return (0); 2069 } 2070 2071 /* 2072 * ecp->clen will be 0 for the first discarded command, but 2073 * may not be 0 for subsequent ones, e.g. if the original 2074 * command was ":g/xx/@a|s/b/c/", then when we discard the 2075 * command pushed on the stack by the @a, we have to resume 2076 * the global command which included the substitute command. 2077 */ 2078 if (ecp->clen != 0) 2079 return (0); 2080 2081 /* 2082 * If it's an @, global or v command, we may need to continue 2083 * the command on a different line. 2084 */ 2085 if (FL_ISSET(ecp->agv_flags, AGV_ALL)) { 2086 /* Discard any exhausted ranges. */ 2087 while ((rp = ecp->rq.cqh_first) != (void *)&ecp->rq) 2088 if (rp->start > rp->stop) { 2089 CIRCLEQ_REMOVE(&ecp->rq, rp, q); 2090 free(rp); 2091 } else 2092 break; 2093 2094 /* If there's another range, continue with it. */ 2095 if (rp != (void *)&ecp->rq) 2096 break; 2097 2098 /* If it's a global/v command, fix up the last line. */ 2099 if (FL_ISSET(ecp->agv_flags, 2100 AGV_GLOBAL | AGV_V) && ecp->range_lno != OOBLNO) 2101 if (db_exist(sp, ecp->range_lno)) 2102 sp->lno = ecp->range_lno; 2103 else { 2104 if (db_last(sp, &sp->lno)) 2105 return (1); 2106 if (sp->lno == 0) 2107 sp->lno = 1; 2108 } 2109 free(ecp->o_cp); 2110 } 2111 2112 /* Discard the EXCMD. */ 2113 LIST_REMOVE(ecp, q); 2114 free(ecp); 2115 } 2116 2117 /* 2118 * We only get here if it's an active @, global or v command. Set 2119 * the current line number, and get a new copy of the command for 2120 * the parser. Note, the original pointer almost certainly moved, 2121 * so we have play games. 2122 */ 2123 ecp->cp = ecp->o_cp; 2124 memcpy(ecp->cp, ecp->cp + ecp->o_clen, ecp->o_clen); 2125 ecp->clen = ecp->o_clen; 2126 ecp->range_lno = sp->lno = rp->start++; 2127 2128 if (FL_ISSET(ecp->agv_flags, AGV_GLOBAL | AGV_V)) 2129 F_SET(sp, SC_EX_GLOBAL); 2130 return (0); 2131 } 2132 2133 /* 2134 * ex_discard -- 2135 * Discard any pending ex commands. 2136 */ 2137 static int 2138 ex_discard(sp) 2139 SCR *sp; 2140 { 2141 GS *gp; 2142 EXCMD *ecp; 2143 RANGE *rp; 2144 2145 /* 2146 * We know the first command can't be an AGV command, so we don't 2147 * process it specially. We do, however, nail the command itself. 2148 */ 2149 for (gp = sp->gp; (ecp = gp->ecq.lh_first) != &gp->excmd;) { 2150 if (FL_ISSET(ecp->agv_flags, AGV_ALL)) { 2151 while ((rp = ecp->rq.cqh_first) != (void *)&ecp->rq) { 2152 CIRCLEQ_REMOVE(&ecp->rq, rp, q); 2153 free(rp); 2154 } 2155 free(ecp->o_cp); 2156 } 2157 LIST_REMOVE(ecp, q); 2158 free(ecp); 2159 } 2160 gp->ecq.lh_first->clen = 0; 2161 return (0); 2162 } 2163 2164 /* 2165 * ex_unknown -- 2166 * Display an unknown command name. 2167 */ 2168 static void 2169 ex_unknown(sp, cmd, len) 2170 SCR *sp; 2171 char *cmd; 2172 size_t len; 2173 { 2174 size_t blen; 2175 char *bp; 2176 2177 GET_SPACE_GOTO(sp, bp, blen, len + 1); 2178 bp[len] = '\0'; 2179 memcpy(bp, cmd, len); 2180 msgq_str(sp, M_ERR, bp, "098|The %s command is unknown"); 2181 FREE_SPACE(sp, bp, blen); 2182 2183 alloc_err: 2184 return; 2185 } 2186 2187 /* 2188 * ex_is_abbrev - 2189 * The vi text input routine needs to know if ex thinks this is an 2190 * [un]abbreviate command, so it can turn off abbreviations. See 2191 * the usual ranting in the vi/v_txt_ev.c:txt_abbrev() routine. 2192 * 2193 * PUBLIC: int ex_is_abbrev __P((char *, size_t)); 2194 */ 2195 int 2196 ex_is_abbrev(name, len) 2197 char *name; 2198 size_t len; 2199 { 2200 EXCMDLIST const *cp; 2201 2202 return ((cp = ex_comm_search(name, len)) != NULL && 2203 (cp == &cmds[C_ABBR] || cp == &cmds[C_UNABBREVIATE])); 2204 } 2205 2206 /* 2207 * ex_is_unmap - 2208 * The vi text input routine needs to know if ex thinks this is an 2209 * unmap command, so it can turn off input mapping. See the usual 2210 * ranting in the vi/v_txt_ev.c:txt_unmap() routine. 2211 * 2212 * PUBLIC: int ex_is_unmap __P((char *, size_t)); 2213 */ 2214 int 2215 ex_is_unmap(name, len) 2216 char *name; 2217 size_t len; 2218 { 2219 EXCMDLIST const *cp; 2220 2221 /* 2222 * The command the vi input routines are really interested in 2223 * is "unmap!", not just unmap. 2224 */ 2225 if (name[len - 1] != '!') 2226 return (0); 2227 --len; 2228 return ((cp = ex_comm_search(name, len)) != NULL && 2229 cp == &cmds[C_UNMAP]); 2230 } 2231 2232 /* 2233 * ex_comm_search -- 2234 * Search for a command name. 2235 */ 2236 static EXCMDLIST const * 2237 ex_comm_search(name, len) 2238 char *name; 2239 size_t len; 2240 { 2241 EXCMDLIST const *cp; 2242 2243 for (cp = cmds; cp->name != NULL; ++cp) { 2244 if (cp->name[0] > name[0]) 2245 return (NULL); 2246 if (cp->name[0] != name[0]) 2247 continue; 2248 if (!memcmp(name, cp->name, len)) 2249 return (cp); 2250 } 2251 return (NULL); 2252 } 2253 2254 /* 2255 * ex_badaddr -- 2256 * Display a bad address message. 2257 * 2258 * PUBLIC: void ex_badaddr 2259 * PUBLIC: __P((SCR *, EXCMDLIST const *, enum badaddr, enum nresult)); 2260 */ 2261 void 2262 ex_badaddr(sp, cp, ba, nret) 2263 SCR *sp; 2264 EXCMDLIST const *cp; 2265 enum badaddr ba; 2266 enum nresult nret; 2267 { 2268 recno_t lno; 2269 2270 switch (nret) { 2271 case NUM_OK: 2272 break; 2273 case NUM_ERR: 2274 msgq(sp, M_SYSERR, NULL); 2275 return; 2276 case NUM_OVER: 2277 msgq(sp, M_ERR, "099|Address value overflow"); 2278 return; 2279 case NUM_UNDER: 2280 msgq(sp, M_ERR, "100|Address value underflow"); 2281 return; 2282 } 2283 2284 /* 2285 * When encountering an address error, tell the user if there's no 2286 * underlying file, that's the real problem. 2287 */ 2288 if (sp->ep == NULL) { 2289 ex_emsg(sp, cp->name, EXM_NOFILEYET); 2290 return; 2291 } 2292 2293 switch (ba) { 2294 case A_COMBO: 2295 msgq(sp, M_ERR, "101|Illegal address combination"); 2296 break; 2297 case A_EOF: 2298 if (db_last(sp, &lno)) 2299 return; 2300 if (lno != 0) { 2301 msgq(sp, M_ERR, 2302 "102|Illegal address: only %lu lines in the file", 2303 lno); 2304 break; 2305 } 2306 /* FALLTHROUGH */ 2307 case A_EMPTY: 2308 msgq(sp, M_ERR, "103|Illegal address: the file is empty"); 2309 break; 2310 case A_NOTSET: 2311 abort(); 2312 /* NOTREACHED */ 2313 case A_ZERO: 2314 msgq(sp, M_ERR, 2315 "104|The %s command doesn't permit an address of 0", 2316 cp->name); 2317 break; 2318 } 2319 return; 2320 } 2321 2322 #if defined(DEBUG) && defined(COMLOG) 2323 /* 2324 * ex_comlog -- 2325 * Log ex commands. 2326 */ 2327 static void 2328 ex_comlog(sp, ecp) 2329 SCR *sp; 2330 EXCMD *ecp; 2331 { 2332 TRACE(sp, "ecmd: %s", ecp->cmd->name); 2333 if (ecp->addrcnt > 0) { 2334 TRACE(sp, " a1 %d", ecp->addr1.lno); 2335 if (ecp->addrcnt > 1) 2336 TRACE(sp, " a2: %d", ecp->addr2.lno); 2337 } 2338 if (ecp->lineno) 2339 TRACE(sp, " line %d", ecp->lineno); 2340 if (ecp->flags) 2341 TRACE(sp, " flags 0x%x", ecp->flags); 2342 if (F_ISSET(&exc, E_BUFFER)) 2343 TRACE(sp, " buffer %c", ecp->buffer); 2344 if (ecp->argc) 2345 for (cnt = 0; cnt < ecp->argc; ++cnt) 2346 TRACE(sp, " arg %d: {%s}", cnt, ecp->argv[cnt]->bp); 2347 TRACE(sp, "\n"); 2348 } 2349 #endif 2350