1 /* $OpenBSD: main.c,v 1.36 2013/11/21 15:54:45 deraadt Exp $ */ 2 /* $NetBSD: main.c,v 1.3 1995/03/21 09:04:44 cgd Exp $ */ 3 4 /* main.c: This file contains the main control and user-interface routines 5 for the ed line editor. */ 6 /*- 7 * Copyright (c) 1993 Andrew Moore, Talke Studio. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * CREDITS 34 * 35 * This program is based on the editor algorithm described in 36 * Brian W. Kernighan and P. J. Plauger's book "Software Tools 37 * in Pascal," Addison-Wesley, 1981. 38 * 39 * The buffering algorithm is attributed to Rodney Ruddock of 40 * the University of Guelph, Guelph, Ontario. 41 * 42 * The cbc.c encryption code is adapted from 43 * the bdes program by Matt Bishop of Dartmouth College, 44 * Hanover, NH. 45 * 46 */ 47 48 #include <sys/ioctl.h> 49 #include <sys/stat.h> 50 #include <sys/wait.h> 51 #include <ctype.h> 52 #include <setjmp.h> 53 #include <unistd.h> 54 #include <pwd.h> 55 56 #include "ed.h" 57 58 59 #ifdef _POSIX_SOURCE 60 sigjmp_buf env; 61 #else 62 jmp_buf env; 63 #endif 64 65 /* static buffers */ 66 char stdinbuf[1]; /* stdin buffer */ 67 char *shcmd; /* shell command buffer */ 68 int shcmdsz; /* shell command buffer size */ 69 int shcmdi; /* shell command buffer index */ 70 char *ibuf; /* ed command-line buffer */ 71 int ibufsz; /* ed command-line buffer size */ 72 char *ibufp; /* pointer to ed command-line buffer */ 73 74 /* global flags */ 75 int des = 0; /* if set, use crypt(3) for i/o */ 76 int garrulous = 0; /* if set, print all error messages */ 77 int isbinary; /* if set, buffer contains ASCII NULs */ 78 int isglobal; /* if set, doing a global command */ 79 int modified; /* if set, buffer modified since last write */ 80 int mutex = 0; /* if set, signals set "sigflags" */ 81 int red = 0; /* if set, restrict shell/directory access */ 82 int scripted = 0; /* if set, suppress diagnostics */ 83 int sigflags = 0; /* if set, signals received while mutex set */ 84 int interactive = 0; /* if set, we are in interactive mode */ 85 86 /* if set, signal handlers are enabled */ 87 volatile sig_atomic_t sigactive = 0; 88 89 char old_filename[MAXPATHLEN] = ""; /* default filename */ 90 int current_addr; /* current address in editor buffer */ 91 int addr_last; /* last address in editor buffer */ 92 int lineno; /* script line number */ 93 char *prompt; /* command-line prompt */ 94 char *dps = "*"; /* default command-line prompt */ 95 96 char *usage = "usage: %s [-] [-sx] [-p string] [file]\n"; 97 98 char *home; /* home directory */ 99 100 void 101 seterrmsg(char *s) 102 { 103 strlcpy(errmsg, s, sizeof(errmsg)); 104 } 105 106 /* ed: line editor */ 107 int 108 main(volatile int argc, char ** volatile argv) 109 { 110 int c, n; 111 int status = 0; 112 113 home = getenv("HOME"); 114 115 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 116 top: 117 while ((c = getopt(argc, argv, "p:sx")) != -1) 118 switch (c) { 119 case 'p': /* set prompt */ 120 prompt = optarg; 121 break; 122 case 's': /* run script */ 123 scripted = 1; 124 break; 125 case 'x': /* use crypt */ 126 #ifdef DES 127 des = get_keyword(); 128 #else 129 fprintf(stderr, "crypt unavailable\n?\n"); 130 #endif 131 break; 132 133 default: 134 fprintf(stderr, usage, argv[0]); 135 exit(1); 136 } 137 argv += optind; 138 argc -= optind; 139 if (argc && **argv == '-') { 140 scripted = 1; 141 if (argc > 1) { 142 optind = 1; 143 goto top; 144 } 145 argv++; 146 argc--; 147 } 148 149 if (!(interactive = isatty(0))) { 150 struct stat sb; 151 152 /* assert: pipes show up as fifo's when fstat'd */ 153 if (fstat(STDIN_FILENO, &sb) || !S_ISFIFO(sb.st_mode)) { 154 if (lseek(STDIN_FILENO, 0, SEEK_CUR)) { 155 interactive = 1; 156 setlinebuf(stdout); 157 } 158 } 159 } 160 161 /* assert: reliable signals! */ 162 #ifdef SIGWINCH 163 if (isatty(STDIN_FILENO)) { 164 handle_winch(SIGWINCH); 165 signal(SIGWINCH, handle_winch); 166 } 167 #endif 168 signal(SIGHUP, signal_hup); 169 signal(SIGQUIT, SIG_IGN); 170 signal(SIGINT, signal_int); 171 #ifdef _POSIX_SOURCE 172 if (status = sigsetjmp(env, 1)) 173 #else 174 if ((status = setjmp(env)) != 0) 175 #endif 176 { 177 fputs("\n?\n", stderr); 178 seterrmsg("interrupt"); 179 } else { 180 init_buffers(); 181 sigactive = 1; /* enable signal handlers */ 182 if (argc && **argv && is_legal_filename(*argv)) { 183 if (read_file(*argv, 0) < 0 && !interactive) 184 quit(2); 185 else if (**argv != '!') 186 strlcpy(old_filename, *argv, 187 sizeof old_filename); 188 } else if (argc) { 189 fputs("?\n", stderr); 190 if (**argv == '\0') 191 seterrmsg("invalid filename"); 192 if (!interactive) 193 quit(2); 194 } 195 } 196 for (;;) { 197 if (status < 0 && garrulous) 198 fprintf(stderr, "%s\n", errmsg); 199 if (prompt) { 200 fputs(prompt, stdout); 201 fflush(stdout); 202 } 203 if ((n = get_tty_line()) < 0) { 204 status = ERR; 205 continue; 206 } else if (n == 0) { 207 if (modified && !scripted) { 208 fputs("?\n", stderr); 209 seterrmsg("warning: file modified"); 210 if (!interactive) { 211 fprintf(stderr, garrulous ? 212 "script, line %d: %s\n" : 213 "", lineno, errmsg); 214 quit(2); 215 } 216 clearerr(stdin); 217 modified = 0; 218 status = EMOD; 219 continue; 220 } else 221 quit(0); 222 } else if (ibuf[n - 1] != '\n') { 223 /* discard line */ 224 seterrmsg("unexpected end-of-file"); 225 clearerr(stdin); 226 status = ERR; 227 continue; 228 } 229 isglobal = 0; 230 if ((status = extract_addr_range()) >= 0 && 231 (status = exec_command()) >= 0) 232 if (!status || (status && 233 (status = display_lines(current_addr, current_addr, 234 status)) >= 0)) 235 continue; 236 switch (status) { 237 case EOF: 238 quit(0); 239 case EMOD: 240 modified = 0; 241 fputs("?\n", stderr); /* give warning */ 242 seterrmsg("warning: file modified"); 243 if (!interactive) { 244 fprintf(stderr, garrulous ? 245 "script, line %d: %s\n" : 246 "", lineno, errmsg); 247 quit(2); 248 } 249 break; 250 case FATAL: 251 if (!interactive) 252 fprintf(stderr, garrulous ? 253 "script, line %d: %s\n" : "", 254 lineno, errmsg); 255 else 256 fprintf(stderr, garrulous ? "%s\n" : "", 257 errmsg); 258 quit(3); 259 default: 260 fputs("?\n", stderr); 261 if (!interactive) { 262 fprintf(stderr, garrulous ? 263 "script, line %d: %s\n" : "", 264 lineno, errmsg); 265 quit(2); 266 } 267 break; 268 } 269 } 270 /*NOTREACHED*/ 271 } 272 273 int first_addr, second_addr, addr_cnt; 274 275 /* extract_addr_range: get line addresses from the command buffer until an 276 illegal address is seen; return status */ 277 int 278 extract_addr_range(void) 279 { 280 int addr; 281 282 addr_cnt = 0; 283 first_addr = second_addr = current_addr; 284 while ((addr = next_addr()) >= 0) { 285 addr_cnt++; 286 first_addr = second_addr; 287 second_addr = addr; 288 if (*ibufp != ',' && *ibufp != ';') 289 break; 290 else if (*ibufp++ == ';') 291 current_addr = addr; 292 } 293 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 294 first_addr = second_addr; 295 return (addr == ERR) ? ERR : 0; 296 } 297 298 299 #define SKIP_BLANKS() \ 300 do { \ 301 while (isspace((unsigned char)*ibufp) && *ibufp != '\n') \ 302 ibufp++; \ 303 } while (0) 304 305 #define MUST_BE_FIRST() \ 306 do { \ 307 if (!first) { \ 308 seterrmsg("invalid address"); \ 309 return ERR; \ 310 } \ 311 } while (0) 312 313 314 /* next_addr: return the next line address in the command buffer */ 315 int 316 next_addr(void) 317 { 318 char *hd; 319 int addr = current_addr; 320 int n; 321 int first = 1; 322 int c; 323 324 SKIP_BLANKS(); 325 for (hd = ibufp;; first = 0) 326 switch ((c = (unsigned char)*ibufp)) { 327 case '+': 328 case '\t': 329 case ' ': 330 case '-': 331 case '^': 332 ibufp++; 333 SKIP_BLANKS(); 334 if (isdigit((unsigned char)*ibufp)) { 335 STRTOI(n, ibufp); 336 addr += (c == '-' || c == '^') ? -n : n; 337 } else if (!isspace(c)) 338 addr += (c == '-' || c == '^') ? -1 : 1; 339 break; 340 case '0': case '1': case '2': 341 case '3': case '4': case '5': 342 case '6': case '7': case '8': case '9': 343 MUST_BE_FIRST(); 344 STRTOI(addr, ibufp); 345 break; 346 case '.': 347 case '$': 348 MUST_BE_FIRST(); 349 ibufp++; 350 addr = (c == '.') ? current_addr : addr_last; 351 break; 352 case '/': 353 case '?': 354 MUST_BE_FIRST(); 355 if ((addr = get_matching_node_addr( 356 get_compiled_pattern(), c == '/')) < 0) 357 return ERR; 358 else if (c == *ibufp) 359 ibufp++; 360 break; 361 case '\'': 362 MUST_BE_FIRST(); 363 ibufp++; 364 if ((addr = get_marked_node_addr((unsigned char)*ibufp++)) < 0) 365 return ERR; 366 break; 367 case '%': 368 case ',': 369 case ';': 370 if (first) { 371 ibufp++; 372 addr_cnt++; 373 second_addr = (c == ';') ? current_addr : 1; 374 addr = addr_last; 375 break; 376 } 377 /* FALLTHROUGH */ 378 default: 379 if (ibufp == hd) 380 return EOF; 381 else if (addr < 0 || addr_last < addr) { 382 seterrmsg("invalid address"); 383 return ERR; 384 } else 385 return addr; 386 } 387 /* NOTREACHED */ 388 } 389 390 391 #ifdef BACKWARDS 392 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 393 #define GET_THIRD_ADDR(addr) \ 394 do { \ 395 int ol1, ol2; \ 396 \ 397 ol1 = first_addr; \ 398 ol2 = second_addr; \ 399 if (extract_addr_range() < 0) \ 400 return ERR; \ 401 else if (addr_cnt == 0) { \ 402 seterrmsg("destination expected"); \ 403 return ERR; \ 404 } else if (second_addr < 0 || addr_last < second_addr) { \ 405 seterrmsg("invalid address"); \ 406 return ERR; \ 407 } \ 408 addr = second_addr; \ 409 first_addr = ol1; \ 410 second_addr = ol2; \ 411 } while (0) 412 413 #else /* BACKWARDS */ 414 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 415 #define GET_THIRD_ADDR(addr) \ 416 do { \ 417 int ol1, ol2; \ 418 \ 419 ol1 = first_addr; \ 420 ol2 = second_addr; \ 421 if (extract_addr_range() < 0) \ 422 return ERR; \ 423 if (second_addr < 0 || addr_last < second_addr) { \ 424 seterrmsg("invalid address"); \ 425 return ERR; \ 426 } \ 427 addr = second_addr; \ 428 first_addr = ol1; \ 429 second_addr = ol2; \ 430 } while (0) 431 #endif 432 433 434 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 435 #define GET_COMMAND_SUFFIX() \ 436 do { \ 437 int done = 0; \ 438 do { \ 439 switch (*ibufp) { \ 440 case 'p': \ 441 gflag |= GPR; \ 442 ibufp++; \ 443 break; \ 444 case 'l': \ 445 gflag |= GLS; \ 446 ibufp++; \ 447 break; \ 448 case 'n': \ 449 gflag |= GNP; \ 450 ibufp++; \ 451 break; \ 452 default: \ 453 done++; \ 454 } \ 455 } while (!done); \ 456 if (*ibufp++ != '\n') { \ 457 seterrmsg("invalid command suffix"); \ 458 return ERR; \ 459 } \ 460 } while (0) 461 462 /* sflags */ 463 #define SGG 001 /* complement previous global substitute suffix */ 464 #define SGP 002 /* complement previous print suffix */ 465 #define SGR 004 /* use last regex instead of last pat */ 466 #define SGF 010 /* repeat last substitution */ 467 468 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 469 470 volatile sig_atomic_t rows = 22; /* scroll length: ws_row - 2 */ 471 volatile sig_atomic_t cols = 72; /* wrap column */ 472 473 /* exec_command: execute the next command in command buffer; return print 474 request, if any */ 475 int 476 exec_command(void) 477 { 478 extern int u_current_addr; 479 extern int u_addr_last; 480 481 static pattern_t *pat = NULL; 482 static int sgflag = 0; 483 static int sgnum = 0; 484 485 pattern_t *tpat; 486 char *fnp; 487 int gflag = 0; 488 int sflags = 0; 489 int addr = 0; 490 int n = 0; 491 int c; 492 493 SKIP_BLANKS(); 494 switch ((c = (unsigned char)*ibufp++)) { 495 case 'a': 496 GET_COMMAND_SUFFIX(); 497 if (!isglobal) clear_undo_stack(); 498 if (append_lines(second_addr) < 0) 499 return ERR; 500 break; 501 case 'c': 502 if (check_addr_range(current_addr, current_addr) < 0) 503 return ERR; 504 GET_COMMAND_SUFFIX(); 505 if (!isglobal) clear_undo_stack(); 506 if (delete_lines(first_addr, second_addr) < 0 || 507 append_lines(current_addr) < 0) 508 return ERR; 509 break; 510 case 'd': 511 if (check_addr_range(current_addr, current_addr) < 0) 512 return ERR; 513 GET_COMMAND_SUFFIX(); 514 if (!isglobal) clear_undo_stack(); 515 if (delete_lines(first_addr, second_addr) < 0) 516 return ERR; 517 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 518 current_addr = addr; 519 break; 520 case 'e': 521 if (modified && !scripted) 522 return EMOD; 523 /* FALLTHROUGH */ 524 case 'E': 525 if (addr_cnt > 0) { 526 seterrmsg("unexpected address"); 527 return ERR; 528 } else if (!isspace((unsigned char)*ibufp)) { 529 seterrmsg("unexpected command suffix"); 530 return ERR; 531 } else if ((fnp = get_filename()) == NULL) 532 return ERR; 533 GET_COMMAND_SUFFIX(); 534 if (delete_lines(1, addr_last) < 0) 535 return ERR; 536 clear_undo_stack(); 537 if (close_sbuf() < 0) 538 return ERR; 539 else if (open_sbuf() < 0) 540 return FATAL; 541 if (*fnp && *fnp != '!') 542 strlcpy(old_filename, fnp, sizeof old_filename); 543 #ifdef BACKWARDS 544 if (*fnp == '\0' && *old_filename == '\0') { 545 seterrmsg("no current filename"); 546 return ERR; 547 } 548 #endif 549 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 550 return ERR; 551 clear_undo_stack(); 552 modified = 0; 553 u_current_addr = u_addr_last = -1; 554 break; 555 case 'f': 556 if (addr_cnt > 0) { 557 seterrmsg("unexpected address"); 558 return ERR; 559 } else if (!isspace((unsigned char)*ibufp)) { 560 seterrmsg("unexpected command suffix"); 561 return ERR; 562 } else if ((fnp = get_filename()) == NULL) 563 return ERR; 564 else if (*fnp == '!') { 565 seterrmsg("invalid redirection"); 566 return ERR; 567 } 568 GET_COMMAND_SUFFIX(); 569 if (*fnp) 570 strlcpy(old_filename, fnp, sizeof old_filename); 571 puts(strip_escapes(old_filename)); 572 break; 573 case 'g': 574 case 'v': 575 case 'G': 576 case 'V': 577 if (isglobal) { 578 seterrmsg("cannot nest global commands"); 579 return ERR; 580 } else if (check_addr_range(1, addr_last) < 0) 581 return ERR; 582 else if (build_active_list(c == 'g' || c == 'G') < 0) 583 return ERR; 584 else if ((n = (c == 'G' || c == 'V'))) 585 GET_COMMAND_SUFFIX(); 586 isglobal++; 587 if (exec_global(n, gflag) < 0) 588 return ERR; 589 break; 590 case 'h': 591 if (addr_cnt > 0) { 592 seterrmsg("unexpected address"); 593 return ERR; 594 } 595 GET_COMMAND_SUFFIX(); 596 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 597 break; 598 case 'H': 599 if (addr_cnt > 0) { 600 seterrmsg("unexpected address"); 601 return ERR; 602 } 603 GET_COMMAND_SUFFIX(); 604 if ((garrulous = 1 - garrulous) && *errmsg) 605 fprintf(stderr, "%s\n", errmsg); 606 break; 607 case 'i': 608 if (second_addr == 0) { 609 seterrmsg("invalid address"); 610 return ERR; 611 } 612 GET_COMMAND_SUFFIX(); 613 if (!isglobal) clear_undo_stack(); 614 if (append_lines(second_addr - 1) < 0) 615 return ERR; 616 break; 617 case 'j': 618 if (check_addr_range(current_addr, current_addr + 1) < 0) 619 return ERR; 620 GET_COMMAND_SUFFIX(); 621 if (!isglobal) clear_undo_stack(); 622 if (first_addr != second_addr && 623 join_lines(first_addr, second_addr) < 0) 624 return ERR; 625 break; 626 case 'k': 627 c = (unsigned char)*ibufp++; 628 if (second_addr == 0) { 629 seterrmsg("invalid address"); 630 return ERR; 631 } 632 GET_COMMAND_SUFFIX(); 633 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 634 return ERR; 635 break; 636 case 'l': 637 if (check_addr_range(current_addr, current_addr) < 0) 638 return ERR; 639 GET_COMMAND_SUFFIX(); 640 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 641 return ERR; 642 gflag = 0; 643 break; 644 case 'm': 645 if (check_addr_range(current_addr, current_addr) < 0) 646 return ERR; 647 GET_THIRD_ADDR(addr); 648 if (first_addr <= addr && addr < second_addr) { 649 seterrmsg("invalid destination"); 650 return ERR; 651 } 652 GET_COMMAND_SUFFIX(); 653 if (!isglobal) clear_undo_stack(); 654 if (move_lines(addr) < 0) 655 return ERR; 656 break; 657 case 'n': 658 if (check_addr_range(current_addr, current_addr) < 0) 659 return ERR; 660 GET_COMMAND_SUFFIX(); 661 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 662 return ERR; 663 gflag = 0; 664 break; 665 case 'p': 666 if (check_addr_range(current_addr, current_addr) < 0) 667 return ERR; 668 GET_COMMAND_SUFFIX(); 669 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 670 return ERR; 671 gflag = 0; 672 break; 673 case 'P': 674 if (addr_cnt > 0) { 675 seterrmsg("unexpected address"); 676 return ERR; 677 } 678 GET_COMMAND_SUFFIX(); 679 prompt = prompt ? NULL : optarg ? optarg : dps; 680 break; 681 case 'q': 682 case 'Q': 683 if (addr_cnt > 0) { 684 seterrmsg("unexpected address"); 685 return ERR; 686 } 687 GET_COMMAND_SUFFIX(); 688 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 689 break; 690 case 'r': 691 if (!isspace((unsigned char)*ibufp)) { 692 seterrmsg("unexpected command suffix"); 693 return ERR; 694 } else if (addr_cnt == 0) 695 second_addr = addr_last; 696 if ((fnp = get_filename()) == NULL) 697 return ERR; 698 GET_COMMAND_SUFFIX(); 699 if (!isglobal) clear_undo_stack(); 700 if (*old_filename == '\0' && *fnp != '!') 701 strlcpy(old_filename, fnp, sizeof old_filename); 702 #ifdef BACKWARDS 703 if (*fnp == '\0' && *old_filename == '\0') { 704 seterrmsg("no current filename"); 705 return ERR; 706 } 707 #endif 708 if ((addr = read_file(*fnp ? fnp : old_filename, 709 second_addr)) < 0) 710 return ERR; 711 else if (addr && addr != addr_last) 712 modified = 1; 713 break; 714 case 's': 715 do { 716 switch (*ibufp) { 717 case '\n': 718 sflags |=SGF; 719 break; 720 case 'g': 721 sflags |= SGG; 722 ibufp++; 723 break; 724 case 'p': 725 sflags |= SGP; 726 ibufp++; 727 break; 728 case 'r': 729 sflags |= SGR; 730 ibufp++; 731 break; 732 case '0': case '1': case '2': case '3': case '4': 733 case '5': case '6': case '7': case '8': case '9': 734 STRTOI(sgnum, ibufp); 735 sflags |= SGF; 736 sgflag &= ~GSG; /* override GSG */ 737 break; 738 default: 739 if (sflags) { 740 seterrmsg("invalid command suffix"); 741 return ERR; 742 } 743 } 744 } while (sflags && *ibufp != '\n'); 745 if (sflags && !pat) { 746 seterrmsg("no previous substitution"); 747 return ERR; 748 } else if (sflags & SGG) 749 sgnum = 0; /* override numeric arg */ 750 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 751 seterrmsg("invalid pattern delimiter"); 752 return ERR; 753 } 754 tpat = pat; 755 SPL1(); 756 if ((!sflags || (sflags & SGR)) && 757 (tpat = get_compiled_pattern()) == NULL) { 758 SPL0(); 759 return ERR; 760 } else if (tpat != pat) { 761 if (pat) { 762 regfree(pat); 763 free(pat); 764 } 765 pat = tpat; 766 patlock = 1; /* reserve pattern */ 767 } 768 SPL0(); 769 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 770 return ERR; 771 else if (isglobal) 772 sgflag |= GLB; 773 else 774 sgflag &= ~GLB; 775 if (sflags & SGG) 776 sgflag ^= GSG; 777 if (sflags & SGP) { 778 sgflag ^= GPR; 779 sgflag &= ~(GLS | GNP); 780 } 781 do { 782 switch (*ibufp) { 783 case 'p': 784 sgflag |= GPR; 785 ibufp++; 786 break; 787 case 'l': 788 sgflag |= GLS; 789 ibufp++; 790 break; 791 case 'n': 792 sgflag |= GNP; 793 ibufp++; 794 break; 795 default: 796 n++; 797 } 798 } while (!n); 799 if (check_addr_range(current_addr, current_addr) < 0) 800 return ERR; 801 GET_COMMAND_SUFFIX(); 802 if (!isglobal) clear_undo_stack(); 803 if (search_and_replace(pat, sgflag, sgnum) < 0) 804 return ERR; 805 break; 806 case 't': 807 if (check_addr_range(current_addr, current_addr) < 0) 808 return ERR; 809 GET_THIRD_ADDR(addr); 810 GET_COMMAND_SUFFIX(); 811 if (!isglobal) clear_undo_stack(); 812 if (copy_lines(addr) < 0) 813 return ERR; 814 break; 815 case 'u': 816 if (addr_cnt > 0) { 817 seterrmsg("unexpected address"); 818 return ERR; 819 } 820 GET_COMMAND_SUFFIX(); 821 if (pop_undo_stack() < 0) 822 return ERR; 823 break; 824 case 'w': 825 case 'W': 826 if ((n = *ibufp) == 'q' || n == 'Q') { 827 gflag = EOF; 828 ibufp++; 829 } 830 if (!isspace((unsigned char)*ibufp)) { 831 seterrmsg("unexpected command suffix"); 832 return ERR; 833 } else if ((fnp = get_filename()) == NULL) 834 return ERR; 835 if (addr_cnt == 0 && !addr_last) 836 first_addr = second_addr = 0; 837 else if (check_addr_range(1, addr_last) < 0) 838 return ERR; 839 GET_COMMAND_SUFFIX(); 840 if (*old_filename == '\0' && *fnp != '!') 841 strlcpy(old_filename, fnp, sizeof old_filename); 842 #ifdef BACKWARDS 843 if (*fnp == '\0' && *old_filename == '\0') { 844 seterrmsg("no current filename"); 845 return ERR; 846 } 847 #endif 848 if ((addr = write_file(*fnp ? fnp : old_filename, 849 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 850 return ERR; 851 else if (addr == addr_last) 852 modified = 0; 853 else if (modified && !scripted && n == 'q') 854 gflag = EMOD; 855 break; 856 case 'x': 857 if (addr_cnt > 0) { 858 seterrmsg("unexpected address"); 859 return ERR; 860 } 861 GET_COMMAND_SUFFIX(); 862 #ifdef DES 863 des = get_keyword(); 864 #else 865 seterrmsg("crypt unavailable"); 866 return ERR; 867 #endif 868 break; 869 case 'z': 870 first_addr = 1; 871 #ifdef BACKWARDS 872 if (check_addr_range(first_addr, current_addr + 1) < 0) 873 #else 874 if (check_addr_range(first_addr, current_addr + !isglobal) < 0) 875 #endif 876 return ERR; 877 else if ('0' < *ibufp && *ibufp <= '9') 878 STRTOI(rows, ibufp); 879 GET_COMMAND_SUFFIX(); 880 if (display_lines(second_addr, min(addr_last, 881 second_addr + rows), gflag) < 0) 882 return ERR; 883 gflag = 0; 884 break; 885 case '=': 886 GET_COMMAND_SUFFIX(); 887 printf("%d\n", addr_cnt ? second_addr : addr_last); 888 break; 889 case '!': 890 if (addr_cnt > 0) { 891 seterrmsg("unexpected address"); 892 return ERR; 893 } else if ((sflags = get_shell_command()) < 0) 894 return ERR; 895 GET_COMMAND_SUFFIX(); 896 if (sflags) printf("%s\n", shcmd + 1); 897 system(shcmd + 1); 898 if (!scripted) printf("!\n"); 899 break; 900 case '\n': 901 first_addr = 1; 902 #ifdef BACKWARDS 903 if (check_addr_range(first_addr, current_addr + 1) < 0 904 #else 905 if (check_addr_range(first_addr, current_addr + !isglobal) < 0 906 #endif 907 || display_lines(second_addr, second_addr, 0) < 0) 908 return ERR; 909 break; 910 default: 911 seterrmsg("unknown command"); 912 return ERR; 913 } 914 return gflag; 915 } 916 917 918 /* check_addr_range: return status of address range check */ 919 int 920 check_addr_range(int n, int m) 921 { 922 if (addr_cnt == 0) { 923 first_addr = n; 924 second_addr = m; 925 } 926 if (first_addr > second_addr || 1 > first_addr || 927 second_addr > addr_last) { 928 seterrmsg("invalid address"); 929 return ERR; 930 } 931 return 0; 932 } 933 934 935 /* get_matching_node_addr: return the address of the next line matching a 936 pattern in a given direction. wrap around begin/end of editor buffer if 937 necessary */ 938 int 939 get_matching_node_addr(pattern_t *pat, int dir) 940 { 941 char *s; 942 int n = current_addr; 943 line_t *lp; 944 945 if (!pat) return ERR; 946 do { 947 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) { 948 lp = get_addressed_line_node(n); 949 if ((s = get_sbuf_line(lp)) == NULL) 950 return ERR; 951 if (isbinary) 952 NUL_TO_NEWLINE(s, lp->len); 953 if (!regexec(pat, s, 0, NULL, 0)) 954 return n; 955 } 956 } while (n != current_addr); 957 seterrmsg("no match"); 958 return ERR; 959 } 960 961 962 /* get_filename: return pointer to copy of filename in the command buffer */ 963 char * 964 get_filename(void) 965 { 966 static char *file = NULL; 967 static int filesz = 0; 968 int n; 969 970 if (*ibufp != '\n') { 971 SKIP_BLANKS(); 972 if (*ibufp == '\n') { 973 seterrmsg("invalid filename"); 974 return NULL; 975 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 976 return NULL; 977 else if (*ibufp == '!') { 978 ibufp++; 979 if ((n = get_shell_command()) < 0) 980 return NULL; 981 if (n) printf("%s\n", shcmd + 1); 982 return shcmd; 983 } else if (n >= MAXPATHLEN) { 984 seterrmsg("filename too long"); 985 return NULL; 986 } 987 } 988 #ifndef BACKWARDS 989 else if (*old_filename == '\0') { 990 seterrmsg("no current filename"); 991 return NULL; 992 } 993 #endif 994 REALLOC(file, filesz, MAXPATHLEN, NULL); 995 for (n = 0; *ibufp != '\n';) 996 file[n++] = *ibufp++; 997 file[n] = '\0'; 998 return is_legal_filename(file) ? file : NULL; 999 } 1000 1001 1002 /* get_shell_command: read a shell command from stdin; return substitution 1003 status */ 1004 int 1005 get_shell_command(void) 1006 { 1007 static char *buf = NULL; 1008 static int n = 0; 1009 1010 char *s; /* substitution char pointer */ 1011 int i = 0; 1012 int j = 0; 1013 1014 if (red) { 1015 seterrmsg("shell access restricted"); 1016 return ERR; 1017 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 1018 return ERR; 1019 REALLOC(buf, n, j + 1, ERR); 1020 buf[i++] = '!'; /* prefix command w/ bang */ 1021 while (*ibufp != '\n') 1022 switch (*ibufp) { 1023 default: 1024 REALLOC(buf, n, i + 2, ERR); 1025 buf[i++] = *ibufp; 1026 if (*ibufp++ == '\\') 1027 buf[i++] = *ibufp++; 1028 break; 1029 case '!': 1030 if (s != ibufp) { 1031 REALLOC(buf, n, i + 1, ERR); 1032 buf[i++] = *ibufp++; 1033 } 1034 #ifdef BACKWARDS 1035 else if (shcmd == NULL || *(shcmd + 1) == '\0') 1036 #else 1037 else if (shcmd == NULL) 1038 #endif 1039 { 1040 seterrmsg("no previous command"); 1041 return ERR; 1042 } else { 1043 REALLOC(buf, n, i + shcmdi, ERR); 1044 for (s = shcmd + 1; s < shcmd + shcmdi;) 1045 buf[i++] = *s++; 1046 s = ibufp++; 1047 } 1048 break; 1049 case '%': 1050 if (*old_filename == '\0') { 1051 seterrmsg("no current filename"); 1052 return ERR; 1053 } 1054 j = strlen(s = strip_escapes(old_filename)); 1055 REALLOC(buf, n, i + j, ERR); 1056 while (j--) 1057 buf[i++] = *s++; 1058 s = ibufp++; 1059 break; 1060 } 1061 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1062 memcpy(shcmd, buf, i); 1063 shcmd[shcmdi = i] = '\0'; 1064 return *s == '!' || *s == '%'; 1065 } 1066 1067 1068 /* append_lines: insert text from stdin to after line n; stop when either a 1069 single period is read or EOF; return status */ 1070 int 1071 append_lines(int n) 1072 { 1073 int l; 1074 char *lp = ibuf; 1075 char *eot; 1076 undo_t *up = NULL; 1077 1078 for (current_addr = n;;) { 1079 if (!isglobal) { 1080 if ((l = get_tty_line()) < 0) 1081 return ERR; 1082 else if (l == 0 || ibuf[l - 1] != '\n') { 1083 clearerr(stdin); 1084 return l ? EOF : 0; 1085 } 1086 lp = ibuf; 1087 } else if (*(lp = ibufp) == '\0') 1088 return 0; 1089 else { 1090 while (*ibufp++ != '\n') 1091 ; 1092 l = ibufp - lp; 1093 } 1094 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1095 return 0; 1096 } 1097 eot = lp + l; 1098 SPL1(); 1099 do { 1100 if ((lp = put_sbuf_line(lp)) == NULL) { 1101 SPL0(); 1102 return ERR; 1103 } else if (up) 1104 up->t = get_addressed_line_node(current_addr); 1105 else if ((up = push_undo_stack(UADD, current_addr, 1106 current_addr)) == NULL) { 1107 SPL0(); 1108 return ERR; 1109 } 1110 } while (lp != eot); 1111 modified = 1; 1112 SPL0(); 1113 } 1114 /* NOTREACHED */ 1115 } 1116 1117 1118 /* join_lines: replace a range of lines with the joined text of those lines */ 1119 int 1120 join_lines(int from, int to) 1121 { 1122 static char *buf = NULL; 1123 static int n; 1124 1125 char *s; 1126 int size = 0; 1127 line_t *bp, *ep; 1128 1129 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1130 bp = get_addressed_line_node(from); 1131 for (; bp != ep; bp = bp->q_forw) { 1132 if ((s = get_sbuf_line(bp)) == NULL) 1133 return ERR; 1134 REALLOC(buf, n, size + bp->len, ERR); 1135 memcpy(buf + size, s, bp->len); 1136 size += bp->len; 1137 } 1138 REALLOC(buf, n, size + 2, ERR); 1139 memcpy(buf + size, "\n", 2); 1140 if (delete_lines(from, to) < 0) 1141 return ERR; 1142 current_addr = from - 1; 1143 SPL1(); 1144 if (put_sbuf_line(buf) == NULL || 1145 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1146 SPL0(); 1147 return ERR; 1148 } 1149 modified = 1; 1150 SPL0(); 1151 return 0; 1152 } 1153 1154 1155 /* move_lines: move a range of lines */ 1156 int 1157 move_lines(int addr) 1158 { 1159 line_t *b1, *a1, *b2, *a2; 1160 int n = INC_MOD(second_addr, addr_last); 1161 int p = first_addr - 1; 1162 int done = (addr == first_addr - 1 || addr == second_addr); 1163 1164 SPL1(); 1165 if (done) { 1166 a2 = get_addressed_line_node(n); 1167 b2 = get_addressed_line_node(p); 1168 current_addr = second_addr; 1169 } else if (push_undo_stack(UMOV, p, n) == NULL || 1170 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1171 SPL0(); 1172 return ERR; 1173 } else { 1174 a1 = get_addressed_line_node(n); 1175 if (addr < first_addr) { 1176 b1 = get_addressed_line_node(p); 1177 b2 = get_addressed_line_node(addr); 1178 /* this get_addressed_line_node last! */ 1179 } else { 1180 b2 = get_addressed_line_node(addr); 1181 b1 = get_addressed_line_node(p); 1182 /* this get_addressed_line_node last! */ 1183 } 1184 a2 = b2->q_forw; 1185 REQUE(b2, b1->q_forw); 1186 REQUE(a1->q_back, a2); 1187 REQUE(b1, a1); 1188 current_addr = addr + ((addr < first_addr) ? 1189 second_addr - first_addr + 1 : 0); 1190 } 1191 if (isglobal) 1192 unset_active_nodes(b2->q_forw, a2); 1193 modified = 1; 1194 SPL0(); 1195 return 0; 1196 } 1197 1198 1199 /* copy_lines: copy a range of lines; return status */ 1200 int 1201 copy_lines(int addr) 1202 { 1203 line_t *lp, *np = get_addressed_line_node(first_addr); 1204 undo_t *up = NULL; 1205 int n = second_addr - first_addr + 1; 1206 int m = 0; 1207 1208 current_addr = addr; 1209 if (first_addr <= addr && addr < second_addr) { 1210 n = addr - first_addr + 1; 1211 m = second_addr - addr; 1212 } 1213 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1214 for (; n-- > 0; np = np->q_forw) { 1215 SPL1(); 1216 if ((lp = dup_line_node(np)) == NULL) { 1217 SPL0(); 1218 return ERR; 1219 } 1220 add_line_node(lp); 1221 if (up) 1222 up->t = lp; 1223 else if ((up = push_undo_stack(UADD, current_addr, 1224 current_addr)) == NULL) { 1225 SPL0(); 1226 return ERR; 1227 } 1228 modified = 1; 1229 SPL0(); 1230 } 1231 return 0; 1232 } 1233 1234 1235 /* delete_lines: delete a range of lines */ 1236 int 1237 delete_lines(int from, int to) 1238 { 1239 line_t *n, *p; 1240 1241 SPL1(); 1242 if (push_undo_stack(UDEL, from, to) == NULL) { 1243 SPL0(); 1244 return ERR; 1245 } 1246 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1247 p = get_addressed_line_node(from - 1); 1248 /* this get_addressed_line_node last! */ 1249 if (isglobal) 1250 unset_active_nodes(p->q_forw, n); 1251 REQUE(p, n); 1252 addr_last -= to - from + 1; 1253 current_addr = from - 1; 1254 modified = 1; 1255 SPL0(); 1256 return 0; 1257 } 1258 1259 1260 /* display_lines: print a range of lines to stdout */ 1261 int 1262 display_lines(int from, int to, int gflag) 1263 { 1264 line_t *bp; 1265 line_t *ep; 1266 char *s; 1267 1268 if (!from) { 1269 seterrmsg("invalid address"); 1270 return ERR; 1271 } 1272 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1273 bp = get_addressed_line_node(from); 1274 for (; bp != ep; bp = bp->q_forw) { 1275 if ((s = get_sbuf_line(bp)) == NULL) 1276 return ERR; 1277 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1278 return ERR; 1279 } 1280 return 0; 1281 } 1282 1283 1284 #define MAXMARK 26 /* max number of marks */ 1285 1286 line_t *mark[MAXMARK]; /* line markers */ 1287 int markno; /* line marker count */ 1288 1289 /* mark_line_node: set a line node mark */ 1290 int 1291 mark_line_node(line_t *lp, int n) 1292 { 1293 if (!islower(n)) { 1294 seterrmsg("invalid mark character"); 1295 return ERR; 1296 } else if (mark[n - 'a'] == NULL) 1297 markno++; 1298 mark[n - 'a'] = lp; 1299 return 0; 1300 } 1301 1302 1303 /* get_marked_node_addr: return address of a marked line */ 1304 int 1305 get_marked_node_addr(int n) 1306 { 1307 if (!islower(n)) { 1308 seterrmsg("invalid mark character"); 1309 return ERR; 1310 } 1311 return get_line_node_addr(mark[n - 'a']); 1312 } 1313 1314 1315 /* unmark_line_node: clear line node mark */ 1316 void 1317 unmark_line_node(line_t *lp) 1318 { 1319 int i; 1320 1321 for (i = 0; markno && i < MAXMARK; i++) 1322 if (mark[i] == lp) { 1323 mark[i] = NULL; 1324 markno--; 1325 } 1326 } 1327 1328 1329 /* dup_line_node: return a pointer to a copy of a line node */ 1330 line_t * 1331 dup_line_node(line_t *lp) 1332 { 1333 line_t *np; 1334 1335 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1336 perror(NULL); 1337 seterrmsg("out of memory"); 1338 return NULL; 1339 } 1340 np->seek = lp->seek; 1341 np->len = lp->len; 1342 return np; 1343 } 1344 1345 1346 /* has_trailing_escape: return the parity of escapes preceding a character 1347 in a string */ 1348 int 1349 has_trailing_escape(char *s, char *t) 1350 { 1351 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1352 } 1353 1354 1355 /* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */ 1356 char * 1357 strip_escapes(char *s) 1358 { 1359 static char *file = NULL; 1360 static int filesz = 0; 1361 1362 int i = 0; 1363 1364 REALLOC(file, filesz, MAXPATHLEN, NULL); 1365 /* assert: no trailing escape */ 1366 while ((file[i++] = (*s == '\\') ? *++s : *s) != '\0' && 1367 i < MAXPATHLEN-1) 1368 s++; 1369 file[MAXPATHLEN-1] = '\0'; 1370 return file; 1371 } 1372 1373 1374 void 1375 signal_hup(int signo) 1376 { 1377 int save_errno = errno; 1378 1379 if (mutex) 1380 sigflags |= (1 << (signo - 1)); 1381 else 1382 handle_hup(signo); 1383 errno = save_errno; 1384 } 1385 1386 1387 void 1388 signal_int(int signo) 1389 { 1390 int save_errno = errno; 1391 1392 if (mutex) 1393 sigflags |= (1 << (signo - 1)); 1394 else 1395 handle_int(signo); 1396 errno = save_errno; 1397 } 1398 1399 1400 void 1401 handle_hup(int signo) 1402 { 1403 char hup[MAXPATHLEN]; 1404 1405 if (!sigactive) 1406 quit(1); 1407 sigflags &= ~(1 << (signo - 1)); 1408 /* XXX signal race */ 1409 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && 1410 home != NULL && home[0] == '/') { 1411 if (strlcpy(hup, home, sizeof(hup)) < sizeof(hup) && 1412 strlcat(hup, "/ed.hup", sizeof(hup)) < sizeof(hup)) 1413 write_file(hup, "w", 1, addr_last); 1414 } 1415 _exit(2); 1416 } 1417 1418 1419 void 1420 handle_int(int signo) 1421 { 1422 if (!sigactive) 1423 _exit(1); 1424 sigflags &= ~(1 << (signo - 1)); 1425 #ifdef _POSIX_SOURCE 1426 siglongjmp(env, -1); 1427 #else 1428 longjmp(env, -1); 1429 #endif 1430 } 1431 1432 1433 void 1434 handle_winch(int signo) 1435 { 1436 int save_errno = errno; 1437 struct winsize ws; /* window size structure */ 1438 1439 sigflags &= ~(1 << (signo - 1)); 1440 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) >= 0) { 1441 if (ws.ws_row > 2) 1442 rows = ws.ws_row - 2; 1443 if (ws.ws_col > 8) 1444 cols = ws.ws_col - 8; 1445 } 1446 errno = save_errno; 1447 } 1448 1449 1450 /* is_legal_filename: return a legal filename */ 1451 int 1452 is_legal_filename(char *s) 1453 { 1454 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1455 seterrmsg("shell access restricted"); 1456 return 0; 1457 } 1458 return 1; 1459 } 1460