1 /* $OpenBSD: main.c,v 1.22 2001/06/22 23:53:53 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 #ifndef lint 33 char *copyright = 34 "@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\ 35 All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char *rcsid = "@(#)main.c,v 1.1 1994/02/01 00:34:42 alm Exp"; 41 #else 42 static char rcsid[] = "$OpenBSD: main.c,v 1.22 2001/06/22 23:53:53 deraadt Exp $"; 43 #endif 44 #endif /* not lint */ 45 46 /* 47 * CREDITS 48 * 49 * This program is based on the editor algorithm described in 50 * Brian W. Kernighan and P. J. Plauger's book "Software Tools 51 * in Pascal," Addison-Wesley, 1981. 52 * 53 * The buffering algorithm is attributed to Rodney Ruddock of 54 * the University of Guelph, Guelph, Ontario. 55 * 56 * The cbc.c encryption code is adapted from 57 * the bdes program by Matt Bishop of Dartmouth College, 58 * Hanover, NH. 59 * 60 */ 61 62 #include <sys/ioctl.h> 63 #include <sys/stat.h> 64 #include <sys/wait.h> 65 #include <ctype.h> 66 #include <setjmp.h> 67 #include <unistd.h> 68 #include <pwd.h> 69 70 #include "ed.h" 71 72 73 #ifdef _POSIX_SOURCE 74 sigjmp_buf env; 75 #else 76 jmp_buf env; 77 #endif 78 79 /* static buffers */ 80 char stdinbuf[1]; /* stdin buffer */ 81 char *shcmd; /* shell command buffer */ 82 int shcmdsz; /* shell command buffer size */ 83 int shcmdi; /* shell command buffer index */ 84 char *ibuf; /* ed command-line buffer */ 85 int ibufsz; /* ed command-line buffer size */ 86 char *ibufp; /* pointer to ed command-line buffer */ 87 88 /* global flags */ 89 int des = 0; /* if set, use crypt(3) for i/o */ 90 int garrulous = 0; /* if set, print all error messages */ 91 int isbinary; /* if set, buffer contains ASCII NULs */ 92 int isglobal; /* if set, doing a global command */ 93 int modified; /* if set, buffer modified since last write */ 94 int mutex = 0; /* if set, signals set "sigflags" */ 95 int red = 0; /* if set, restrict shell/directory access */ 96 int scripted = 0; /* if set, suppress diagnostics */ 97 int sigflags = 0; /* if set, signals received while mutex set */ 98 int sigactive = 0; /* if set, signal handlers are enabled */ 99 int interactive = 0; /* if set, we are in interactive mode */ 100 101 char old_filename[MAXPATHLEN] = ""; /* default filename */ 102 long current_addr; /* current address in editor buffer */ 103 long addr_last; /* last address in editor buffer */ 104 int lineno; /* script line number */ 105 char *prompt; /* command-line prompt */ 106 char *dps = "*"; /* default command-line prompt */ 107 108 char *usage = "usage: %s [-] [-sx] [-p string] [name]\n"; 109 110 char *home; /* home directory */ 111 112 void 113 seterrmsg(char *s) 114 { 115 strlcpy(errmsg, s, sizeof(errmsg)); 116 } 117 118 /* ed: line editor */ 119 int 120 main(argc, argv) 121 int argc; 122 char **argv; 123 { 124 int c, n; 125 long status = 0; 126 127 #ifdef __GNUC__ 128 (void)&argc; 129 (void)&argv; 130 #endif 131 132 home = getenv("HOME"); 133 134 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 135 top: 136 while ((c = getopt(argc, argv, "p:sx")) != -1) 137 switch (c) { 138 case 'p': /* set prompt */ 139 prompt = optarg; 140 break; 141 case 's': /* run script */ 142 scripted = 1; 143 break; 144 case 'x': /* use crypt */ 145 #ifdef DES 146 des = get_keyword(); 147 #else 148 fprintf(stderr, "crypt unavailable\n?\n"); 149 #endif 150 break; 151 152 default: 153 fprintf(stderr, usage, argv[0]); 154 exit(1); 155 } 156 argv += optind; 157 argc -= optind; 158 if (argc && **argv == '-') { 159 scripted = 1; 160 if (argc > 1) { 161 optind = 1; 162 goto top; 163 } 164 argv++; 165 argc--; 166 } 167 168 if (!(interactive = isatty(0))) { 169 struct stat sb; 170 171 /* assert: pipes show up as fifo's when fstat'd */ 172 if (fstat(0, &sb) || !S_ISFIFO(sb.st_mode)) { 173 if (lseek(0, 0, SEEK_CUR)) { 174 interactive = 1; 175 setlinebuf(stdout); 176 } 177 } 178 } 179 180 /* assert: reliable signals! */ 181 #ifdef SIGWINCH 182 handle_winch(SIGWINCH); 183 if (isatty(0)) 184 signal(SIGWINCH, handle_winch); 185 #endif 186 signal(SIGHUP, signal_hup); 187 signal(SIGQUIT, SIG_IGN); 188 signal(SIGINT, signal_int); 189 #ifdef _POSIX_SOURCE 190 if (status = sigsetjmp(env, 1)) 191 #else 192 if ((status = setjmp(env)) != 0) 193 #endif 194 { 195 fputs("\n?\n", stderr); 196 seterrmsg("interrupt"); 197 } else { 198 init_buffers(); 199 sigactive = 1; /* enable signal handlers */ 200 if (argc && **argv && is_legal_filename(*argv)) { 201 if (read_file(*argv, 0) < 0 && !interactive) 202 quit(2); 203 else if (**argv != '!') 204 strlcpy(old_filename, *argv, 205 sizeof old_filename); 206 } else if (argc) { 207 fputs("?\n", stderr); 208 if (**argv == '\0') 209 seterrmsg("invalid filename"); 210 if (!interactive) 211 quit(2); 212 } 213 } 214 for (;;) { 215 if (status < 0 && garrulous) 216 fprintf(stderr, "%s\n", errmsg); 217 if (prompt) { 218 fputs(prompt, stdout); 219 fflush(stdout); 220 } 221 if ((n = get_tty_line()) < 0) { 222 status = ERR; 223 continue; 224 } else if (n == 0) { 225 if (modified && !scripted) { 226 fputs("?\n", stderr); 227 seterrmsg("warning: file modified"); 228 if (!interactive) { 229 fprintf(stderr, garrulous ? 230 "script, line %d: %s\n" : 231 "", lineno, errmsg); 232 quit(2); 233 } 234 clearerr(stdin); 235 modified = 0; 236 status = EMOD; 237 continue; 238 } else 239 quit(0); 240 } else if (ibuf[n - 1] != '\n') { 241 /* discard line */ 242 seterrmsg("unexpected end-of-file"); 243 clearerr(stdin); 244 status = ERR; 245 continue; 246 } 247 isglobal = 0; 248 if ((status = extract_addr_range()) >= 0 && 249 (status = exec_command()) >= 0) 250 if (!status || (status && 251 (status = display_lines(current_addr, current_addr, 252 status)) >= 0)) 253 continue; 254 switch (status) { 255 case EOF: 256 quit(0); 257 case EMOD: 258 modified = 0; 259 fputs("?\n", stderr); /* give warning */ 260 seterrmsg("warning: file modified"); 261 if (!interactive) { 262 fprintf(stderr, garrulous ? 263 "script, line %d: %s\n" : 264 "", lineno, errmsg); 265 quit(2); 266 } 267 break; 268 case FATAL: 269 if (!interactive) 270 fprintf(stderr, garrulous ? 271 "script, line %d: %s\n" : "", 272 lineno, errmsg); 273 else 274 fprintf(stderr, garrulous ? "%s\n" : "", 275 errmsg); 276 quit(3); 277 default: 278 fputs("?\n", stderr); 279 if (!interactive) { 280 fprintf(stderr, garrulous ? 281 "script, line %d: %s\n" : "", 282 lineno, errmsg); 283 quit(2); 284 } 285 break; 286 } 287 } 288 /*NOTREACHED*/ 289 } 290 291 long first_addr, second_addr, addr_cnt; 292 293 /* extract_addr_range: get line addresses from the command buffer until an 294 illegal address is seen; return status */ 295 int 296 extract_addr_range() 297 { 298 long addr; 299 300 addr_cnt = 0; 301 first_addr = second_addr = current_addr; 302 while ((addr = next_addr()) >= 0) { 303 addr_cnt++; 304 first_addr = second_addr; 305 second_addr = addr; 306 if (*ibufp != ',' && *ibufp != ';') 307 break; 308 else if (*ibufp++ == ';') 309 current_addr = addr; 310 } 311 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 312 first_addr = second_addr; 313 return (addr == ERR) ? ERR : 0; 314 } 315 316 317 #define SKIP_BLANKS() \ 318 do { \ 319 while (isspace(*ibufp) && *ibufp != '\n') \ 320 ibufp++; \ 321 } while (0) 322 323 #define MUST_BE_FIRST() \ 324 do { \ 325 if (!first) { \ 326 seterrmsg("invalid address"); \ 327 return ERR; \ 328 } \ 329 } while (0) 330 331 332 /* next_addr: return the next line address in the command buffer */ 333 long 334 next_addr() 335 { 336 char *hd; 337 long addr = current_addr; 338 long n; 339 int first = 1; 340 int c; 341 342 SKIP_BLANKS(); 343 for (hd = ibufp;; first = 0) 344 switch ((c = *ibufp)) { 345 case '+': 346 case '\t': 347 case ' ': 348 case '-': 349 case '^': 350 ibufp++; 351 SKIP_BLANKS(); 352 if (isdigit(*ibufp)) { 353 STRTOL(n, ibufp); 354 addr += (c == '-' || c == '^') ? -n : n; 355 } else if (!isspace(c)) 356 addr += (c == '-' || c == '^') ? -1 : 1; 357 break; 358 case '0': case '1': case '2': 359 case '3': case '4': case '5': 360 case '6': case '7': case '8': case '9': 361 MUST_BE_FIRST(); 362 STRTOL(addr, ibufp); 363 break; 364 case '.': 365 case '$': 366 MUST_BE_FIRST(); 367 ibufp++; 368 addr = (c == '.') ? current_addr : addr_last; 369 break; 370 case '/': 371 case '?': 372 MUST_BE_FIRST(); 373 if ((addr = get_matching_node_addr( 374 get_compiled_pattern(), c == '/')) < 0) 375 return ERR; 376 else if (c == *ibufp) 377 ibufp++; 378 break; 379 case '\'': 380 MUST_BE_FIRST(); 381 ibufp++; 382 if ((addr = get_marked_node_addr(*ibufp++)) < 0) 383 return ERR; 384 break; 385 case '%': 386 case ',': 387 case ';': 388 if (first) { 389 ibufp++; 390 addr_cnt++; 391 second_addr = (c == ';') ? current_addr : 1; 392 addr = addr_last; 393 break; 394 } 395 /* FALL THROUGH */ 396 default: 397 if (ibufp == hd) 398 return EOF; 399 else if (addr < 0 || addr_last < addr) { 400 seterrmsg("invalid address"); 401 return ERR; 402 } else 403 return addr; 404 } 405 /* NOTREACHED */ 406 } 407 408 409 #ifdef BACKWARDS 410 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 411 #define GET_THIRD_ADDR(addr) \ 412 do { \ 413 long ol1, ol2; \ 414 \ 415 ol1 = first_addr; \ 416 ol2 = second_addr; \ 417 if (extract_addr_range() < 0) \ 418 return ERR; \ 419 else if (addr_cnt == 0) { \ 420 seterrmsg("destination expected"); \ 421 return ERR; \ 422 } else if (second_addr < 0 || addr_last < second_addr) { \ 423 seterrmsg("invalid address"); \ 424 return ERR; \ 425 } \ 426 addr = second_addr; \ 427 first_addr = ol1; \ 428 second_addr = ol2; \ 429 } while (0) 430 431 #else /* BACKWARDS */ 432 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 433 #define GET_THIRD_ADDR(addr) \ 434 do { \ 435 long ol1, ol2; \ 436 \ 437 ol1 = first_addr; \ 438 ol2 = second_addr; \ 439 if (extract_addr_range() < 0) \ 440 return ERR; \ 441 if (second_addr < 0 || addr_last < second_addr) { \ 442 seterrmsg("invalid address"); \ 443 return ERR; \ 444 } \ 445 addr = second_addr; \ 446 first_addr = ol1; \ 447 second_addr = ol2; \ 448 } while (0) 449 #endif 450 451 452 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 453 #define GET_COMMAND_SUFFIX() \ 454 do { \ 455 int done = 0; \ 456 do { \ 457 switch (*ibufp) { \ 458 case 'p': \ 459 gflag |= GPR; \ 460 ibufp++; \ 461 break; \ 462 case 'l': \ 463 gflag |= GLS; \ 464 ibufp++; \ 465 break; \ 466 case 'n': \ 467 gflag |= GNP; \ 468 ibufp++; \ 469 break; \ 470 default: \ 471 done++; \ 472 } \ 473 } while (!done); \ 474 if (*ibufp++ != '\n') { \ 475 seterrmsg("invalid command suffix"); \ 476 return ERR; \ 477 } \ 478 } while (0) 479 480 /* sflags */ 481 #define SGG 001 /* complement previous global substitute suffix */ 482 #define SGP 002 /* complement previous print suffix */ 483 #define SGR 004 /* use last regex instead of last pat */ 484 #define SGF 010 /* repeat last substitution */ 485 486 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 487 488 sig_atomic_t rows = 22; /* scroll length: ws_row - 2 */ 489 sig_atomic_t cols = 72; /* wrap column */ 490 491 /* exec_command: execute the next command in command buffer; return print 492 request, if any */ 493 int 494 exec_command() 495 { 496 extern long u_current_addr; 497 extern long u_addr_last; 498 499 static pattern_t *pat = NULL; 500 static int sgflag = 0; 501 static long sgnum = 0; 502 503 pattern_t *tpat; 504 char *fnp; 505 int gflag = 0; 506 int sflags = 0; 507 long addr = 0; 508 int n = 0; 509 int c; 510 511 SKIP_BLANKS(); 512 switch ((c = *ibufp++)) { 513 case 'a': 514 GET_COMMAND_SUFFIX(); 515 if (!isglobal) clear_undo_stack(); 516 if (append_lines(second_addr) < 0) 517 return ERR; 518 break; 519 case 'c': 520 if (check_addr_range(current_addr, current_addr) < 0) 521 return ERR; 522 GET_COMMAND_SUFFIX(); 523 if (!isglobal) clear_undo_stack(); 524 if (delete_lines(first_addr, second_addr) < 0 || 525 append_lines(current_addr) < 0) 526 return ERR; 527 break; 528 case 'd': 529 if (check_addr_range(current_addr, current_addr) < 0) 530 return ERR; 531 GET_COMMAND_SUFFIX(); 532 if (!isglobal) clear_undo_stack(); 533 if (delete_lines(first_addr, second_addr) < 0) 534 return ERR; 535 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 536 current_addr = addr; 537 break; 538 case 'e': 539 if (modified && !scripted) 540 return EMOD; 541 /* fall through */ 542 case 'E': 543 if (addr_cnt > 0) { 544 seterrmsg("unexpected address"); 545 return ERR; 546 } else if (!isspace(*ibufp)) { 547 seterrmsg("unexpected command suffix"); 548 return ERR; 549 } else if ((fnp = get_filename()) == NULL) 550 return ERR; 551 GET_COMMAND_SUFFIX(); 552 if (delete_lines(1, addr_last) < 0) 553 return ERR; 554 clear_undo_stack(); 555 if (close_sbuf() < 0) 556 return ERR; 557 else if (open_sbuf() < 0) 558 return FATAL; 559 if (*fnp && *fnp != '!') 560 strlcpy(old_filename, fnp, sizeof old_filename); 561 #ifdef BACKWARDS 562 if (*fnp == '\0' && *old_filename == '\0') { 563 seterrmsg("no current filename"); 564 return ERR; 565 } 566 #endif 567 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 568 return ERR; 569 clear_undo_stack(); 570 modified = 0; 571 u_current_addr = u_addr_last = -1; 572 break; 573 case 'f': 574 if (addr_cnt > 0) { 575 seterrmsg("unexpected address"); 576 return ERR; 577 } else if (!isspace(*ibufp)) { 578 seterrmsg("unexpected command suffix"); 579 return ERR; 580 } else if ((fnp = get_filename()) == NULL) 581 return ERR; 582 else if (*fnp == '!') { 583 seterrmsg("invalid redirection"); 584 return ERR; 585 } 586 GET_COMMAND_SUFFIX(); 587 if (*fnp) 588 strlcpy(old_filename, fnp, sizeof old_filename); 589 puts(strip_escapes(old_filename)); 590 break; 591 case 'g': 592 case 'v': 593 case 'G': 594 case 'V': 595 if (isglobal) { 596 seterrmsg("cannot nest global commands"); 597 return ERR; 598 } else if (check_addr_range(1, addr_last) < 0) 599 return ERR; 600 else if (build_active_list(c == 'g' || c == 'G') < 0) 601 return ERR; 602 else if ((n = (c == 'G' || c == 'V'))) 603 GET_COMMAND_SUFFIX(); 604 isglobal++; 605 if (exec_global(n, gflag) < 0) 606 return ERR; 607 break; 608 case 'h': 609 if (addr_cnt > 0) { 610 seterrmsg("unexpected address"); 611 return ERR; 612 } 613 GET_COMMAND_SUFFIX(); 614 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 615 break; 616 case 'H': 617 if (addr_cnt > 0) { 618 seterrmsg("unexpected address"); 619 return ERR; 620 } 621 GET_COMMAND_SUFFIX(); 622 if ((garrulous = 1 - garrulous) && *errmsg) 623 fprintf(stderr, "%s\n", errmsg); 624 break; 625 case 'i': 626 if (second_addr == 0) { 627 seterrmsg("invalid address"); 628 return ERR; 629 } 630 GET_COMMAND_SUFFIX(); 631 if (!isglobal) clear_undo_stack(); 632 if (append_lines(second_addr - 1) < 0) 633 return ERR; 634 break; 635 case 'j': 636 if (check_addr_range(current_addr, current_addr + 1) < 0) 637 return ERR; 638 GET_COMMAND_SUFFIX(); 639 if (!isglobal) clear_undo_stack(); 640 if (first_addr != second_addr && 641 join_lines(first_addr, second_addr) < 0) 642 return ERR; 643 break; 644 case 'k': 645 c = *ibufp++; 646 if (second_addr == 0) { 647 seterrmsg("invalid address"); 648 return ERR; 649 } 650 GET_COMMAND_SUFFIX(); 651 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 652 return ERR; 653 break; 654 case 'l': 655 if (check_addr_range(current_addr, current_addr) < 0) 656 return ERR; 657 GET_COMMAND_SUFFIX(); 658 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 659 return ERR; 660 gflag = 0; 661 break; 662 case 'm': 663 if (check_addr_range(current_addr, current_addr) < 0) 664 return ERR; 665 GET_THIRD_ADDR(addr); 666 if (first_addr <= addr && addr < second_addr) { 667 seterrmsg("invalid destination"); 668 return ERR; 669 } 670 GET_COMMAND_SUFFIX(); 671 if (!isglobal) clear_undo_stack(); 672 if (move_lines(addr) < 0) 673 return ERR; 674 break; 675 case 'n': 676 if (check_addr_range(current_addr, current_addr) < 0) 677 return ERR; 678 GET_COMMAND_SUFFIX(); 679 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 680 return ERR; 681 gflag = 0; 682 break; 683 case 'p': 684 if (check_addr_range(current_addr, current_addr) < 0) 685 return ERR; 686 GET_COMMAND_SUFFIX(); 687 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 688 return ERR; 689 gflag = 0; 690 break; 691 case 'P': 692 if (addr_cnt > 0) { 693 seterrmsg("unexpected address"); 694 return ERR; 695 } 696 GET_COMMAND_SUFFIX(); 697 prompt = prompt ? NULL : optarg ? optarg : dps; 698 break; 699 case 'q': 700 case 'Q': 701 if (addr_cnt > 0) { 702 seterrmsg("unexpected address"); 703 return ERR; 704 } 705 GET_COMMAND_SUFFIX(); 706 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 707 break; 708 case 'r': 709 if (!isspace(*ibufp)) { 710 seterrmsg("unexpected command suffix"); 711 return ERR; 712 } else if (addr_cnt == 0) 713 second_addr = addr_last; 714 if ((fnp = get_filename()) == NULL) 715 return ERR; 716 GET_COMMAND_SUFFIX(); 717 if (!isglobal) clear_undo_stack(); 718 if (*old_filename == '\0' && *fnp != '!') 719 strlcpy(old_filename, fnp, sizeof old_filename); 720 #ifdef BACKWARDS 721 if (*fnp == '\0' && *old_filename == '\0') { 722 seterrmsg("no current filename"); 723 return ERR; 724 } 725 #endif 726 if ((addr = read_file(*fnp ? fnp : old_filename, 727 second_addr)) < 0) 728 return ERR; 729 else if (addr && addr != addr_last) 730 modified = 1; 731 break; 732 case 's': 733 do { 734 switch (*ibufp) { 735 case '\n': 736 sflags |=SGF; 737 break; 738 case 'g': 739 sflags |= SGG; 740 ibufp++; 741 break; 742 case 'p': 743 sflags |= SGP; 744 ibufp++; 745 break; 746 case 'r': 747 sflags |= SGR; 748 ibufp++; 749 break; 750 case '0': case '1': case '2': case '3': case '4': 751 case '5': case '6': case '7': case '8': case '9': 752 STRTOL(sgnum, ibufp); 753 sflags |= SGF; 754 sgflag &= ~GSG; /* override GSG */ 755 break; 756 default: 757 if (sflags) { 758 seterrmsg("invalid command suffix"); 759 return ERR; 760 } 761 } 762 } while (sflags && *ibufp != '\n'); 763 if (sflags && !pat) { 764 seterrmsg("no previous substitution"); 765 return ERR; 766 } else if (sflags & SGG) 767 sgnum = 0; /* override numeric arg */ 768 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 769 seterrmsg("invalid pattern delimiter"); 770 return ERR; 771 } 772 tpat = pat; 773 SPL1(); 774 if ((!sflags || (sflags & SGR)) && 775 (tpat = get_compiled_pattern()) == NULL) { 776 SPL0(); 777 return ERR; 778 } else if (tpat != pat) { 779 if (pat) { 780 regfree(pat); 781 free(pat); 782 } 783 pat = tpat; 784 patlock = 1; /* reserve pattern */ 785 } 786 SPL0(); 787 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 788 return ERR; 789 else if (isglobal) 790 sgflag |= GLB; 791 else 792 sgflag &= ~GLB; 793 if (sflags & SGG) 794 sgflag ^= GSG; 795 if (sflags & SGP) { 796 sgflag ^= GPR; 797 sgflag &= ~(GLS | GNP); 798 } 799 do { 800 switch (*ibufp) { 801 case 'p': 802 sgflag |= GPR; 803 ibufp++; 804 break; 805 case 'l': 806 sgflag |= GLS; 807 ibufp++; 808 break; 809 case 'n': 810 sgflag |= GNP; 811 ibufp++; 812 break; 813 default: 814 n++; 815 } 816 } while (!n); 817 if (check_addr_range(current_addr, current_addr) < 0) 818 return ERR; 819 GET_COMMAND_SUFFIX(); 820 if (!isglobal) clear_undo_stack(); 821 if (search_and_replace(pat, sgflag, sgnum) < 0) 822 return ERR; 823 break; 824 case 't': 825 if (check_addr_range(current_addr, current_addr) < 0) 826 return ERR; 827 GET_THIRD_ADDR(addr); 828 GET_COMMAND_SUFFIX(); 829 if (!isglobal) clear_undo_stack(); 830 if (copy_lines(addr) < 0) 831 return ERR; 832 break; 833 case 'u': 834 if (addr_cnt > 0) { 835 seterrmsg("unexpected address"); 836 return ERR; 837 } 838 GET_COMMAND_SUFFIX(); 839 if (pop_undo_stack() < 0) 840 return ERR; 841 break; 842 case 'w': 843 case 'W': 844 if ((n = *ibufp) == 'q' || n == 'Q') { 845 gflag = EOF; 846 ibufp++; 847 } 848 if (!isspace(*ibufp)) { 849 seterrmsg("unexpected command suffix"); 850 return ERR; 851 } else if ((fnp = get_filename()) == NULL) 852 return ERR; 853 if (addr_cnt == 0 && !addr_last) 854 first_addr = second_addr = 0; 855 else if (check_addr_range(1, addr_last) < 0) 856 return ERR; 857 GET_COMMAND_SUFFIX(); 858 if (*old_filename == '\0' && *fnp != '!') 859 strlcpy(old_filename, fnp, sizeof old_filename); 860 #ifdef BACKWARDS 861 if (*fnp == '\0' && *old_filename == '\0') { 862 seterrmsg("no current filename"); 863 return ERR; 864 } 865 #endif 866 if ((addr = write_file(*fnp ? fnp : old_filename, 867 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 868 return ERR; 869 else if (addr == addr_last) 870 modified = 0; 871 else if (modified && !scripted && n == 'q') 872 gflag = EMOD; 873 break; 874 case 'x': 875 if (addr_cnt > 0) { 876 seterrmsg("unexpected address"); 877 return ERR; 878 } 879 GET_COMMAND_SUFFIX(); 880 #ifdef DES 881 des = get_keyword(); 882 #else 883 seterrmsg("crypt unavailable"); 884 return ERR; 885 #endif 886 break; 887 case 'z': 888 first_addr = 1; 889 #ifdef BACKWARDS 890 if (check_addr_range(first_addr, current_addr + 1) < 0) 891 #else 892 if (check_addr_range(first_addr, current_addr + !isglobal) < 0) 893 #endif 894 return ERR; 895 else if ('0' < *ibufp && *ibufp <= '9') 896 STRTOL(rows, ibufp); 897 GET_COMMAND_SUFFIX(); 898 if (display_lines(second_addr, min(addr_last, 899 second_addr + rows), gflag) < 0) 900 return ERR; 901 gflag = 0; 902 break; 903 case '=': 904 GET_COMMAND_SUFFIX(); 905 printf("%ld\n", addr_cnt ? second_addr : addr_last); 906 break; 907 case '!': 908 if (addr_cnt > 0) { 909 seterrmsg("unexpected address"); 910 return ERR; 911 } else if ((sflags = get_shell_command()) < 0) 912 return ERR; 913 GET_COMMAND_SUFFIX(); 914 if (sflags) printf("%s\n", shcmd + 1); 915 system(shcmd + 1); 916 if (!scripted) printf("!\n"); 917 break; 918 case '\n': 919 first_addr = 1; 920 #ifdef BACKWARDS 921 if (check_addr_range(first_addr, current_addr + 1) < 0 922 #else 923 if (check_addr_range(first_addr, current_addr + !isglobal) < 0 924 #endif 925 || display_lines(second_addr, second_addr, 0) < 0) 926 return ERR; 927 break; 928 default: 929 seterrmsg("unknown command"); 930 return ERR; 931 } 932 return gflag; 933 } 934 935 936 /* check_addr_range: return status of address range check */ 937 int 938 check_addr_range(n, m) 939 long n, m; 940 { 941 if (addr_cnt == 0) { 942 first_addr = n; 943 second_addr = m; 944 } 945 if (first_addr > second_addr || 1 > first_addr || 946 second_addr > addr_last) { 947 seterrmsg("invalid address"); 948 return ERR; 949 } 950 return 0; 951 } 952 953 954 /* get_matching_node_addr: return the address of the next line matching a 955 pattern in a given direction. wrap around begin/end of editor buffer if 956 necessary */ 957 long 958 get_matching_node_addr(pat, dir) 959 pattern_t *pat; 960 int dir; 961 { 962 char *s; 963 long n = current_addr; 964 line_t *lp; 965 966 if (!pat) return ERR; 967 do { 968 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) { 969 lp = get_addressed_line_node(n); 970 if ((s = get_sbuf_line(lp)) == NULL) 971 return ERR; 972 if (isbinary) 973 NUL_TO_NEWLINE(s, lp->len); 974 if (!regexec(pat, s, 0, NULL, 0)) 975 return n; 976 } 977 } while (n != current_addr); 978 seterrmsg("no match"); 979 return ERR; 980 } 981 982 983 /* get_filename: return pointer to copy of filename in the command buffer */ 984 char * 985 get_filename() 986 { 987 static char *file = NULL; 988 static int filesz = 0; 989 int n; 990 991 if (*ibufp != '\n') { 992 SKIP_BLANKS(); 993 if (*ibufp == '\n') { 994 seterrmsg("invalid filename"); 995 return NULL; 996 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 997 return NULL; 998 else if (*ibufp == '!') { 999 ibufp++; 1000 if ((n = get_shell_command()) < 0) 1001 return NULL; 1002 if (n) printf("%s\n", shcmd + 1); 1003 return shcmd; 1004 } else if (n >= MAXPATHLEN) { 1005 seterrmsg("filename too long"); 1006 return NULL; 1007 } 1008 } 1009 #ifndef BACKWARDS 1010 else if (*old_filename == '\0') { 1011 seterrmsg("no current filename"); 1012 return NULL; 1013 } 1014 #endif 1015 REALLOC(file, filesz, MAXPATHLEN, NULL); 1016 for (n = 0; *ibufp != '\n';) 1017 file[n++] = *ibufp++; 1018 file[n] = '\0'; 1019 return is_legal_filename(file) ? file : NULL; 1020 } 1021 1022 1023 /* get_shell_command: read a shell command from stdin; return substitution 1024 status */ 1025 int 1026 get_shell_command() 1027 { 1028 static char *buf = NULL; 1029 static int n = 0; 1030 1031 char *s; /* substitution char pointer */ 1032 int i = 0; 1033 int j = 0; 1034 1035 if (red) { 1036 seterrmsg("shell access restricted"); 1037 return ERR; 1038 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 1039 return ERR; 1040 REALLOC(buf, n, j + 1, ERR); 1041 buf[i++] = '!'; /* prefix command w/ bang */ 1042 while (*ibufp != '\n') 1043 switch (*ibufp) { 1044 default: 1045 REALLOC(buf, n, i + 2, ERR); 1046 buf[i++] = *ibufp; 1047 if (*ibufp++ == '\\') 1048 buf[i++] = *ibufp++; 1049 break; 1050 case '!': 1051 if (s != ibufp) { 1052 REALLOC(buf, n, i + 1, ERR); 1053 buf[i++] = *ibufp++; 1054 } 1055 #ifdef BACKWARDS 1056 else if (shcmd == NULL || *(shcmd + 1) == '\0') 1057 #else 1058 else if (shcmd == NULL) 1059 #endif 1060 { 1061 seterrmsg("no previous command"); 1062 return ERR; 1063 } else { 1064 REALLOC(buf, n, i + shcmdi, ERR); 1065 for (s = shcmd + 1; s < shcmd + shcmdi;) 1066 buf[i++] = *s++; 1067 s = ibufp++; 1068 } 1069 break; 1070 case '%': 1071 if (*old_filename == '\0') { 1072 seterrmsg("no current filename"); 1073 return ERR; 1074 } 1075 j = strlen(s = strip_escapes(old_filename)); 1076 REALLOC(buf, n, i + j, ERR); 1077 while (j--) 1078 buf[i++] = *s++; 1079 s = ibufp++; 1080 break; 1081 } 1082 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1083 memcpy(shcmd, buf, i); 1084 shcmd[shcmdi = i] = '\0'; 1085 return *s == '!' || *s == '%'; 1086 } 1087 1088 1089 /* append_lines: insert text from stdin to after line n; stop when either a 1090 single period is read or EOF; return status */ 1091 int 1092 append_lines(n) 1093 long n; 1094 { 1095 int l; 1096 char *lp = ibuf; 1097 char *eot; 1098 undo_t *up = NULL; 1099 1100 for (current_addr = n;;) { 1101 if (!isglobal) { 1102 if ((l = get_tty_line()) < 0) 1103 return ERR; 1104 else if (l == 0 || ibuf[l - 1] != '\n') { 1105 clearerr(stdin); 1106 return l ? EOF : 0; 1107 } 1108 lp = ibuf; 1109 } else if (*(lp = ibufp) == '\0') 1110 return 0; 1111 else { 1112 while (*ibufp++ != '\n') 1113 ; 1114 l = ibufp - lp; 1115 } 1116 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1117 return 0; 1118 } 1119 eot = lp + l; 1120 SPL1(); 1121 do { 1122 if ((lp = put_sbuf_line(lp)) == NULL) { 1123 SPL0(); 1124 return ERR; 1125 } else if (up) 1126 up->t = get_addressed_line_node(current_addr); 1127 else if ((up = push_undo_stack(UADD, current_addr, 1128 current_addr)) == NULL) { 1129 SPL0(); 1130 return ERR; 1131 } 1132 } while (lp != eot); 1133 modified = 1; 1134 SPL0(); 1135 } 1136 /* NOTREACHED */ 1137 } 1138 1139 1140 /* join_lines: replace a range of lines with the joined text of those lines */ 1141 int 1142 join_lines(from, to) 1143 long from; 1144 long to; 1145 { 1146 static char *buf = NULL; 1147 static int n; 1148 1149 char *s; 1150 int size = 0; 1151 line_t *bp, *ep; 1152 1153 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1154 bp = get_addressed_line_node(from); 1155 for (; bp != ep; bp = bp->q_forw) { 1156 if ((s = get_sbuf_line(bp)) == NULL) 1157 return ERR; 1158 REALLOC(buf, n, size + bp->len, ERR); 1159 memcpy(buf + size, s, bp->len); 1160 size += bp->len; 1161 } 1162 REALLOC(buf, n, size + 2, ERR); 1163 memcpy(buf + size, "\n", 2); 1164 if (delete_lines(from, to) < 0) 1165 return ERR; 1166 current_addr = from - 1; 1167 SPL1(); 1168 if (put_sbuf_line(buf) == NULL || 1169 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1170 SPL0(); 1171 return ERR; 1172 } 1173 modified = 1; 1174 SPL0(); 1175 return 0; 1176 } 1177 1178 1179 /* move_lines: move a range of lines */ 1180 int 1181 move_lines(addr) 1182 long addr; 1183 { 1184 line_t *b1, *a1, *b2, *a2; 1185 long n = INC_MOD(second_addr, addr_last); 1186 long p = first_addr - 1; 1187 int done = (addr == first_addr - 1 || addr == second_addr); 1188 1189 SPL1(); 1190 if (done) { 1191 a2 = get_addressed_line_node(n); 1192 b2 = get_addressed_line_node(p); 1193 current_addr = second_addr; 1194 } else if (push_undo_stack(UMOV, p, n) == NULL || 1195 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1196 SPL0(); 1197 return ERR; 1198 } else { 1199 a1 = get_addressed_line_node(n); 1200 if (addr < first_addr) { 1201 b1 = get_addressed_line_node(p); 1202 b2 = get_addressed_line_node(addr); 1203 /* this get_addressed_line_node last! */ 1204 } else { 1205 b2 = get_addressed_line_node(addr); 1206 b1 = get_addressed_line_node(p); 1207 /* this get_addressed_line_node last! */ 1208 } 1209 a2 = b2->q_forw; 1210 REQUE(b2, b1->q_forw); 1211 REQUE(a1->q_back, a2); 1212 REQUE(b1, a1); 1213 current_addr = addr + ((addr < first_addr) ? 1214 second_addr - first_addr + 1 : 0); 1215 } 1216 if (isglobal) 1217 unset_active_nodes(b2->q_forw, a2); 1218 modified = 1; 1219 SPL0(); 1220 return 0; 1221 } 1222 1223 1224 /* copy_lines: copy a range of lines; return status */ 1225 int 1226 copy_lines(addr) 1227 long addr; 1228 { 1229 line_t *lp, *np = get_addressed_line_node(first_addr); 1230 undo_t *up = NULL; 1231 long n = second_addr - first_addr + 1; 1232 long m = 0; 1233 1234 current_addr = addr; 1235 if (first_addr <= addr && addr < second_addr) { 1236 n = addr - first_addr + 1; 1237 m = second_addr - addr; 1238 } 1239 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1240 for (; n-- > 0; np = np->q_forw) { 1241 SPL1(); 1242 if ((lp = dup_line_node(np)) == NULL) { 1243 SPL0(); 1244 return ERR; 1245 } 1246 add_line_node(lp); 1247 if (up) 1248 up->t = lp; 1249 else if ((up = push_undo_stack(UADD, current_addr, 1250 current_addr)) == NULL) { 1251 SPL0(); 1252 return ERR; 1253 } 1254 modified = 1; 1255 SPL0(); 1256 } 1257 return 0; 1258 } 1259 1260 1261 /* delete_lines: delete a range of lines */ 1262 int 1263 delete_lines(from, to) 1264 long from, to; 1265 { 1266 line_t *n, *p; 1267 1268 SPL1(); 1269 if (push_undo_stack(UDEL, from, to) == NULL) { 1270 SPL0(); 1271 return ERR; 1272 } 1273 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1274 p = get_addressed_line_node(from - 1); 1275 /* this get_addressed_line_node last! */ 1276 if (isglobal) 1277 unset_active_nodes(p->q_forw, n); 1278 REQUE(p, n); 1279 addr_last -= to - from + 1; 1280 current_addr = from - 1; 1281 modified = 1; 1282 SPL0(); 1283 return 0; 1284 } 1285 1286 1287 /* display_lines: print a range of lines to stdout */ 1288 int 1289 display_lines(from, to, gflag) 1290 long from; 1291 long to; 1292 int gflag; 1293 { 1294 line_t *bp; 1295 line_t *ep; 1296 char *s; 1297 1298 if (!from) { 1299 seterrmsg("invalid address"); 1300 return ERR; 1301 } 1302 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1303 bp = get_addressed_line_node(from); 1304 for (; bp != ep; bp = bp->q_forw) { 1305 if ((s = get_sbuf_line(bp)) == NULL) 1306 return ERR; 1307 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1308 return ERR; 1309 } 1310 return 0; 1311 } 1312 1313 1314 #define MAXMARK 26 /* max number of marks */ 1315 1316 line_t *mark[MAXMARK]; /* line markers */ 1317 int markno; /* line marker count */ 1318 1319 /* mark_line_node: set a line node mark */ 1320 int 1321 mark_line_node(lp, n) 1322 line_t *lp; 1323 int n; 1324 { 1325 if (!islower(n)) { 1326 seterrmsg("invalid mark character"); 1327 return ERR; 1328 } else if (mark[n - 'a'] == NULL) 1329 markno++; 1330 mark[n - 'a'] = lp; 1331 return 0; 1332 } 1333 1334 1335 /* get_marked_node_addr: return address of a marked line */ 1336 long 1337 get_marked_node_addr(n) 1338 int n; 1339 { 1340 if (!islower(n)) { 1341 seterrmsg("invalid mark character"); 1342 return ERR; 1343 } 1344 return get_line_node_addr(mark[n - 'a']); 1345 } 1346 1347 1348 /* unmark_line_node: clear line node mark */ 1349 void 1350 unmark_line_node(lp) 1351 line_t *lp; 1352 { 1353 int i; 1354 1355 for (i = 0; markno && i < MAXMARK; i++) 1356 if (mark[i] == lp) { 1357 mark[i] = NULL; 1358 markno--; 1359 } 1360 } 1361 1362 1363 /* dup_line_node: return a pointer to a copy of a line node */ 1364 line_t * 1365 dup_line_node(lp) 1366 line_t *lp; 1367 { 1368 line_t *np; 1369 1370 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1371 perror(NULL); 1372 seterrmsg("out of memory"); 1373 return NULL; 1374 } 1375 np->seek = lp->seek; 1376 np->len = lp->len; 1377 return np; 1378 } 1379 1380 1381 /* has_trailing_escape: return the parity of escapes preceding a character 1382 in a string */ 1383 int 1384 has_trailing_escape(s, t) 1385 char *s; 1386 char *t; 1387 { 1388 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1389 } 1390 1391 1392 /* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */ 1393 char * 1394 strip_escapes(s) 1395 char *s; 1396 { 1397 static char *file = NULL; 1398 static int filesz = 0; 1399 1400 int i = 0; 1401 1402 REALLOC(file, filesz, MAXPATHLEN, NULL); 1403 /* assert: no trailing escape */ 1404 while ((file[i++] = (*s == '\\') ? *++s : *s) != '\0' && 1405 i < MAXPATHLEN-1) 1406 s++; 1407 file[MAXPATHLEN-1] = '\0'; 1408 return file; 1409 } 1410 1411 1412 void 1413 signal_hup(signo) 1414 int signo; 1415 { 1416 int save_errno = errno; 1417 1418 if (mutex) 1419 sigflags |= (1 << (signo - 1)); 1420 else 1421 handle_hup(signo); 1422 errno = save_errno; 1423 } 1424 1425 1426 void 1427 signal_int(signo) 1428 int signo; 1429 { 1430 int save_errno = errno; 1431 1432 if (mutex) 1433 sigflags |= (1 << (signo - 1)); 1434 else 1435 handle_int(signo); 1436 errno = save_errno; 1437 } 1438 1439 1440 void 1441 handle_hup(signo) 1442 int signo; 1443 { 1444 char path[MAXPATHLEN]; 1445 char *hup = NULL; /* hup filename */ 1446 1447 if (!sigactive) 1448 quit(1); 1449 sigflags &= ~(1 << (signo - 1)); 1450 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && 1451 home != NULL && 1452 strlen(home) + sizeof("/ed.hup") <= MAXPATHLEN) { 1453 strlcpy(path, home, sizeof(path)); 1454 strlcat(path, "/ed.hup", sizeof(path)); 1455 write_file(hup, "w", 1, addr_last); 1456 } 1457 _exit(2); 1458 } 1459 1460 1461 void 1462 handle_int(signo) 1463 int signo; 1464 { 1465 if (!sigactive) 1466 _exit(1); 1467 sigflags &= ~(1 << (signo - 1)); 1468 #ifdef _POSIX_SOURCE 1469 siglongjmp(env, -1); 1470 #else 1471 longjmp(env, -1); 1472 #endif 1473 } 1474 1475 1476 void 1477 handle_winch(signo) 1478 int signo; 1479 { 1480 int save_errno = errno; 1481 1482 struct winsize ws; /* window size structure */ 1483 1484 sigflags &= ~(1 << (signo - 1)); 1485 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1486 if (ws.ws_row > 2) 1487 rows = ws.ws_row - 2; 1488 if (ws.ws_col > 8) 1489 cols = ws.ws_col - 8; 1490 } 1491 errno = save_errno; 1492 } 1493 1494 1495 /* is_legal_filename: return a legal filename */ 1496 int 1497 is_legal_filename(s) 1498 char *s; 1499 { 1500 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1501 seterrmsg("shell access restricted"); 1502 return 0; 1503 } 1504 return 1; 1505 } 1506