1 /* $OpenBSD: main.c,v 1.28 2003/06/11 23:42:12 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 1.28 2003/06/11 23:42:12 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 int current_addr; /* current address in editor buffer */ 103 int 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(volatile int argc, char ** volatile argv) 121 { 122 int c, n; 123 int status = 0; 124 125 home = getenv("HOME"); 126 127 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 128 top: 129 while ((c = getopt(argc, argv, "p:sx")) != -1) 130 switch (c) { 131 case 'p': /* set prompt */ 132 prompt = optarg; 133 break; 134 case 's': /* run script */ 135 scripted = 1; 136 break; 137 case 'x': /* use crypt */ 138 #ifdef DES 139 des = get_keyword(); 140 #else 141 fprintf(stderr, "crypt unavailable\n?\n"); 142 #endif 143 break; 144 145 default: 146 fprintf(stderr, usage, argv[0]); 147 exit(1); 148 } 149 argv += optind; 150 argc -= optind; 151 if (argc && **argv == '-') { 152 scripted = 1; 153 if (argc > 1) { 154 optind = 1; 155 goto top; 156 } 157 argv++; 158 argc--; 159 } 160 161 if (!(interactive = isatty(0))) { 162 struct stat sb; 163 164 /* assert: pipes show up as fifo's when fstat'd */ 165 if (fstat(0, &sb) || !S_ISFIFO(sb.st_mode)) { 166 if (lseek(0, 0, SEEK_CUR)) { 167 interactive = 1; 168 setlinebuf(stdout); 169 } 170 } 171 } 172 173 /* assert: reliable signals! */ 174 #ifdef SIGWINCH 175 handle_winch(SIGWINCH); 176 if (isatty(0)) 177 signal(SIGWINCH, handle_winch); 178 #endif 179 signal(SIGHUP, signal_hup); 180 signal(SIGQUIT, SIG_IGN); 181 signal(SIGINT, signal_int); 182 #ifdef _POSIX_SOURCE 183 if (status = sigsetjmp(env, 1)) 184 #else 185 if ((status = setjmp(env)) != 0) 186 #endif 187 { 188 fputs("\n?\n", stderr); 189 seterrmsg("interrupt"); 190 } else { 191 init_buffers(); 192 sigactive = 1; /* enable signal handlers */ 193 if (argc && **argv && is_legal_filename(*argv)) { 194 if (read_file(*argv, 0) < 0 && !interactive) 195 quit(2); 196 else if (**argv != '!') 197 strlcpy(old_filename, *argv, 198 sizeof old_filename); 199 } else if (argc) { 200 fputs("?\n", stderr); 201 if (**argv == '\0') 202 seterrmsg("invalid filename"); 203 if (!interactive) 204 quit(2); 205 } 206 } 207 for (;;) { 208 if (status < 0 && garrulous) 209 fprintf(stderr, "%s\n", errmsg); 210 if (prompt) { 211 fputs(prompt, stdout); 212 fflush(stdout); 213 } 214 if ((n = get_tty_line()) < 0) { 215 status = ERR; 216 continue; 217 } else if (n == 0) { 218 if (modified && !scripted) { 219 fputs("?\n", stderr); 220 seterrmsg("warning: file modified"); 221 if (!interactive) { 222 fprintf(stderr, garrulous ? 223 "script, line %d: %s\n" : 224 "", lineno, errmsg); 225 quit(2); 226 } 227 clearerr(stdin); 228 modified = 0; 229 status = EMOD; 230 continue; 231 } else 232 quit(0); 233 } else if (ibuf[n - 1] != '\n') { 234 /* discard line */ 235 seterrmsg("unexpected end-of-file"); 236 clearerr(stdin); 237 status = ERR; 238 continue; 239 } 240 isglobal = 0; 241 if ((status = extract_addr_range()) >= 0 && 242 (status = exec_command()) >= 0) 243 if (!status || (status && 244 (status = display_lines(current_addr, current_addr, 245 status)) >= 0)) 246 continue; 247 switch (status) { 248 case EOF: 249 quit(0); 250 case EMOD: 251 modified = 0; 252 fputs("?\n", stderr); /* give warning */ 253 seterrmsg("warning: file modified"); 254 if (!interactive) { 255 fprintf(stderr, garrulous ? 256 "script, line %d: %s\n" : 257 "", lineno, errmsg); 258 quit(2); 259 } 260 break; 261 case FATAL: 262 if (!interactive) 263 fprintf(stderr, garrulous ? 264 "script, line %d: %s\n" : "", 265 lineno, errmsg); 266 else 267 fprintf(stderr, garrulous ? "%s\n" : "", 268 errmsg); 269 quit(3); 270 default: 271 fputs("?\n", stderr); 272 if (!interactive) { 273 fprintf(stderr, garrulous ? 274 "script, line %d: %s\n" : "", 275 lineno, errmsg); 276 quit(2); 277 } 278 break; 279 } 280 } 281 /*NOTREACHED*/ 282 } 283 284 int first_addr, second_addr, addr_cnt; 285 286 /* extract_addr_range: get line addresses from the command buffer until an 287 illegal address is seen; return status */ 288 int 289 extract_addr_range(void) 290 { 291 int addr; 292 293 addr_cnt = 0; 294 first_addr = second_addr = current_addr; 295 while ((addr = next_addr()) >= 0) { 296 addr_cnt++; 297 first_addr = second_addr; 298 second_addr = addr; 299 if (*ibufp != ',' && *ibufp != ';') 300 break; 301 else if (*ibufp++ == ';') 302 current_addr = addr; 303 } 304 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 305 first_addr = second_addr; 306 return (addr == ERR) ? ERR : 0; 307 } 308 309 310 #define SKIP_BLANKS() \ 311 do { \ 312 while (isspace(*ibufp) && *ibufp != '\n') \ 313 ibufp++; \ 314 } while (0) 315 316 #define MUST_BE_FIRST() \ 317 do { \ 318 if (!first) { \ 319 seterrmsg("invalid address"); \ 320 return ERR; \ 321 } \ 322 } while (0) 323 324 325 /* next_addr: return the next line address in the command buffer */ 326 int 327 next_addr(void) 328 { 329 char *hd; 330 int addr = current_addr; 331 int n; 332 int first = 1; 333 int c; 334 335 SKIP_BLANKS(); 336 for (hd = ibufp;; first = 0) 337 switch ((c = *ibufp)) { 338 case '+': 339 case '\t': 340 case ' ': 341 case '-': 342 case '^': 343 ibufp++; 344 SKIP_BLANKS(); 345 if (isdigit(*ibufp)) { 346 STRTOI(n, ibufp); 347 addr += (c == '-' || c == '^') ? -n : n; 348 } else if (!isspace(c)) 349 addr += (c == '-' || c == '^') ? -1 : 1; 350 break; 351 case '0': case '1': case '2': 352 case '3': case '4': case '5': 353 case '6': case '7': case '8': case '9': 354 MUST_BE_FIRST(); 355 STRTOI(addr, ibufp); 356 break; 357 case '.': 358 case '$': 359 MUST_BE_FIRST(); 360 ibufp++; 361 addr = (c == '.') ? current_addr : addr_last; 362 break; 363 case '/': 364 case '?': 365 MUST_BE_FIRST(); 366 if ((addr = get_matching_node_addr( 367 get_compiled_pattern(), c == '/')) < 0) 368 return ERR; 369 else if (c == *ibufp) 370 ibufp++; 371 break; 372 case '\'': 373 MUST_BE_FIRST(); 374 ibufp++; 375 if ((addr = get_marked_node_addr(*ibufp++)) < 0) 376 return ERR; 377 break; 378 case '%': 379 case ',': 380 case ';': 381 if (first) { 382 ibufp++; 383 addr_cnt++; 384 second_addr = (c == ';') ? current_addr : 1; 385 addr = addr_last; 386 break; 387 } 388 /* FALL THROUGH */ 389 default: 390 if (ibufp == hd) 391 return EOF; 392 else if (addr < 0 || addr_last < addr) { 393 seterrmsg("invalid address"); 394 return ERR; 395 } else 396 return addr; 397 } 398 /* NOTREACHED */ 399 } 400 401 402 #ifdef BACKWARDS 403 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 404 #define GET_THIRD_ADDR(addr) \ 405 do { \ 406 int ol1, ol2; \ 407 \ 408 ol1 = first_addr; \ 409 ol2 = second_addr; \ 410 if (extract_addr_range() < 0) \ 411 return ERR; \ 412 else if (addr_cnt == 0) { \ 413 seterrmsg("destination expected"); \ 414 return ERR; \ 415 } else if (second_addr < 0 || addr_last < second_addr) { \ 416 seterrmsg("invalid address"); \ 417 return ERR; \ 418 } \ 419 addr = second_addr; \ 420 first_addr = ol1; \ 421 second_addr = ol2; \ 422 } while (0) 423 424 #else /* BACKWARDS */ 425 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 426 #define GET_THIRD_ADDR(addr) \ 427 do { \ 428 int ol1, ol2; \ 429 \ 430 ol1 = first_addr; \ 431 ol2 = second_addr; \ 432 if (extract_addr_range() < 0) \ 433 return ERR; \ 434 if (second_addr < 0 || addr_last < second_addr) { \ 435 seterrmsg("invalid address"); \ 436 return ERR; \ 437 } \ 438 addr = second_addr; \ 439 first_addr = ol1; \ 440 second_addr = ol2; \ 441 } while (0) 442 #endif 443 444 445 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 446 #define GET_COMMAND_SUFFIX() \ 447 do { \ 448 int done = 0; \ 449 do { \ 450 switch (*ibufp) { \ 451 case 'p': \ 452 gflag |= GPR; \ 453 ibufp++; \ 454 break; \ 455 case 'l': \ 456 gflag |= GLS; \ 457 ibufp++; \ 458 break; \ 459 case 'n': \ 460 gflag |= GNP; \ 461 ibufp++; \ 462 break; \ 463 default: \ 464 done++; \ 465 } \ 466 } while (!done); \ 467 if (*ibufp++ != '\n') { \ 468 seterrmsg("invalid command suffix"); \ 469 return ERR; \ 470 } \ 471 } while (0) 472 473 /* sflags */ 474 #define SGG 001 /* complement previous global substitute suffix */ 475 #define SGP 002 /* complement previous print suffix */ 476 #define SGR 004 /* use last regex instead of last pat */ 477 #define SGF 010 /* repeat last substitution */ 478 479 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 480 481 volatile sig_atomic_t rows = 22; /* scroll length: ws_row - 2 */ 482 volatile sig_atomic_t cols = 72; /* wrap column */ 483 484 /* exec_command: execute the next command in command buffer; return print 485 request, if any */ 486 int 487 exec_command(void) 488 { 489 extern int u_current_addr; 490 extern int u_addr_last; 491 492 static pattern_t *pat = NULL; 493 static int sgflag = 0; 494 static int sgnum = 0; 495 496 pattern_t *tpat; 497 char *fnp; 498 int gflag = 0; 499 int sflags = 0; 500 int addr = 0; 501 int n = 0; 502 int c; 503 504 SKIP_BLANKS(); 505 switch ((c = *ibufp++)) { 506 case 'a': 507 GET_COMMAND_SUFFIX(); 508 if (!isglobal) clear_undo_stack(); 509 if (append_lines(second_addr) < 0) 510 return ERR; 511 break; 512 case 'c': 513 if (check_addr_range(current_addr, current_addr) < 0) 514 return ERR; 515 GET_COMMAND_SUFFIX(); 516 if (!isglobal) clear_undo_stack(); 517 if (delete_lines(first_addr, second_addr) < 0 || 518 append_lines(current_addr) < 0) 519 return ERR; 520 break; 521 case 'd': 522 if (check_addr_range(current_addr, current_addr) < 0) 523 return ERR; 524 GET_COMMAND_SUFFIX(); 525 if (!isglobal) clear_undo_stack(); 526 if (delete_lines(first_addr, second_addr) < 0) 527 return ERR; 528 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 529 current_addr = addr; 530 break; 531 case 'e': 532 if (modified && !scripted) 533 return EMOD; 534 /* fall through */ 535 case 'E': 536 if (addr_cnt > 0) { 537 seterrmsg("unexpected address"); 538 return ERR; 539 } else if (!isspace(*ibufp)) { 540 seterrmsg("unexpected command suffix"); 541 return ERR; 542 } else if ((fnp = get_filename()) == NULL) 543 return ERR; 544 GET_COMMAND_SUFFIX(); 545 if (delete_lines(1, addr_last) < 0) 546 return ERR; 547 clear_undo_stack(); 548 if (close_sbuf() < 0) 549 return ERR; 550 else if (open_sbuf() < 0) 551 return FATAL; 552 if (*fnp && *fnp != '!') 553 strlcpy(old_filename, fnp, sizeof old_filename); 554 #ifdef BACKWARDS 555 if (*fnp == '\0' && *old_filename == '\0') { 556 seterrmsg("no current filename"); 557 return ERR; 558 } 559 #endif 560 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 561 return ERR; 562 clear_undo_stack(); 563 modified = 0; 564 u_current_addr = u_addr_last = -1; 565 break; 566 case 'f': 567 if (addr_cnt > 0) { 568 seterrmsg("unexpected address"); 569 return ERR; 570 } else if (!isspace(*ibufp)) { 571 seterrmsg("unexpected command suffix"); 572 return ERR; 573 } else if ((fnp = get_filename()) == NULL) 574 return ERR; 575 else if (*fnp == '!') { 576 seterrmsg("invalid redirection"); 577 return ERR; 578 } 579 GET_COMMAND_SUFFIX(); 580 if (*fnp) 581 strlcpy(old_filename, fnp, sizeof old_filename); 582 puts(strip_escapes(old_filename)); 583 break; 584 case 'g': 585 case 'v': 586 case 'G': 587 case 'V': 588 if (isglobal) { 589 seterrmsg("cannot nest global commands"); 590 return ERR; 591 } else if (check_addr_range(1, addr_last) < 0) 592 return ERR; 593 else if (build_active_list(c == 'g' || c == 'G') < 0) 594 return ERR; 595 else if ((n = (c == 'G' || c == 'V'))) 596 GET_COMMAND_SUFFIX(); 597 isglobal++; 598 if (exec_global(n, gflag) < 0) 599 return ERR; 600 break; 601 case 'h': 602 if (addr_cnt > 0) { 603 seterrmsg("unexpected address"); 604 return ERR; 605 } 606 GET_COMMAND_SUFFIX(); 607 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 608 break; 609 case 'H': 610 if (addr_cnt > 0) { 611 seterrmsg("unexpected address"); 612 return ERR; 613 } 614 GET_COMMAND_SUFFIX(); 615 if ((garrulous = 1 - garrulous) && *errmsg) 616 fprintf(stderr, "%s\n", errmsg); 617 break; 618 case 'i': 619 if (second_addr == 0) { 620 seterrmsg("invalid address"); 621 return ERR; 622 } 623 GET_COMMAND_SUFFIX(); 624 if (!isglobal) clear_undo_stack(); 625 if (append_lines(second_addr - 1) < 0) 626 return ERR; 627 break; 628 case 'j': 629 if (check_addr_range(current_addr, current_addr + 1) < 0) 630 return ERR; 631 GET_COMMAND_SUFFIX(); 632 if (!isglobal) clear_undo_stack(); 633 if (first_addr != second_addr && 634 join_lines(first_addr, second_addr) < 0) 635 return ERR; 636 break; 637 case 'k': 638 c = *ibufp++; 639 if (second_addr == 0) { 640 seterrmsg("invalid address"); 641 return ERR; 642 } 643 GET_COMMAND_SUFFIX(); 644 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 645 return ERR; 646 break; 647 case 'l': 648 if (check_addr_range(current_addr, current_addr) < 0) 649 return ERR; 650 GET_COMMAND_SUFFIX(); 651 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 652 return ERR; 653 gflag = 0; 654 break; 655 case 'm': 656 if (check_addr_range(current_addr, current_addr) < 0) 657 return ERR; 658 GET_THIRD_ADDR(addr); 659 if (first_addr <= addr && addr < second_addr) { 660 seterrmsg("invalid destination"); 661 return ERR; 662 } 663 GET_COMMAND_SUFFIX(); 664 if (!isglobal) clear_undo_stack(); 665 if (move_lines(addr) < 0) 666 return ERR; 667 break; 668 case 'n': 669 if (check_addr_range(current_addr, current_addr) < 0) 670 return ERR; 671 GET_COMMAND_SUFFIX(); 672 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 673 return ERR; 674 gflag = 0; 675 break; 676 case 'p': 677 if (check_addr_range(current_addr, current_addr) < 0) 678 return ERR; 679 GET_COMMAND_SUFFIX(); 680 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 681 return ERR; 682 gflag = 0; 683 break; 684 case 'P': 685 if (addr_cnt > 0) { 686 seterrmsg("unexpected address"); 687 return ERR; 688 } 689 GET_COMMAND_SUFFIX(); 690 prompt = prompt ? NULL : optarg ? optarg : dps; 691 break; 692 case 'q': 693 case 'Q': 694 if (addr_cnt > 0) { 695 seterrmsg("unexpected address"); 696 return ERR; 697 } 698 GET_COMMAND_SUFFIX(); 699 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 700 break; 701 case 'r': 702 if (!isspace(*ibufp)) { 703 seterrmsg("unexpected command suffix"); 704 return ERR; 705 } else if (addr_cnt == 0) 706 second_addr = addr_last; 707 if ((fnp = get_filename()) == NULL) 708 return ERR; 709 GET_COMMAND_SUFFIX(); 710 if (!isglobal) clear_undo_stack(); 711 if (*old_filename == '\0' && *fnp != '!') 712 strlcpy(old_filename, fnp, sizeof old_filename); 713 #ifdef BACKWARDS 714 if (*fnp == '\0' && *old_filename == '\0') { 715 seterrmsg("no current filename"); 716 return ERR; 717 } 718 #endif 719 if ((addr = read_file(*fnp ? fnp : old_filename, 720 second_addr)) < 0) 721 return ERR; 722 else if (addr && addr != addr_last) 723 modified = 1; 724 break; 725 case 's': 726 do { 727 switch (*ibufp) { 728 case '\n': 729 sflags |=SGF; 730 break; 731 case 'g': 732 sflags |= SGG; 733 ibufp++; 734 break; 735 case 'p': 736 sflags |= SGP; 737 ibufp++; 738 break; 739 case 'r': 740 sflags |= SGR; 741 ibufp++; 742 break; 743 case '0': case '1': case '2': case '3': case '4': 744 case '5': case '6': case '7': case '8': case '9': 745 STRTOI(sgnum, ibufp); 746 sflags |= SGF; 747 sgflag &= ~GSG; /* override GSG */ 748 break; 749 default: 750 if (sflags) { 751 seterrmsg("invalid command suffix"); 752 return ERR; 753 } 754 } 755 } while (sflags && *ibufp != '\n'); 756 if (sflags && !pat) { 757 seterrmsg("no previous substitution"); 758 return ERR; 759 } else if (sflags & SGG) 760 sgnum = 0; /* override numeric arg */ 761 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 762 seterrmsg("invalid pattern delimiter"); 763 return ERR; 764 } 765 tpat = pat; 766 SPL1(); 767 if ((!sflags || (sflags & SGR)) && 768 (tpat = get_compiled_pattern()) == NULL) { 769 SPL0(); 770 return ERR; 771 } else if (tpat != pat) { 772 if (pat) { 773 regfree(pat); 774 free(pat); 775 } 776 pat = tpat; 777 patlock = 1; /* reserve pattern */ 778 } 779 SPL0(); 780 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 781 return ERR; 782 else if (isglobal) 783 sgflag |= GLB; 784 else 785 sgflag &= ~GLB; 786 if (sflags & SGG) 787 sgflag ^= GSG; 788 if (sflags & SGP) { 789 sgflag ^= GPR; 790 sgflag &= ~(GLS | GNP); 791 } 792 do { 793 switch (*ibufp) { 794 case 'p': 795 sgflag |= GPR; 796 ibufp++; 797 break; 798 case 'l': 799 sgflag |= GLS; 800 ibufp++; 801 break; 802 case 'n': 803 sgflag |= GNP; 804 ibufp++; 805 break; 806 default: 807 n++; 808 } 809 } while (!n); 810 if (check_addr_range(current_addr, current_addr) < 0) 811 return ERR; 812 GET_COMMAND_SUFFIX(); 813 if (!isglobal) clear_undo_stack(); 814 if (search_and_replace(pat, sgflag, sgnum) < 0) 815 return ERR; 816 break; 817 case 't': 818 if (check_addr_range(current_addr, current_addr) < 0) 819 return ERR; 820 GET_THIRD_ADDR(addr); 821 GET_COMMAND_SUFFIX(); 822 if (!isglobal) clear_undo_stack(); 823 if (copy_lines(addr) < 0) 824 return ERR; 825 break; 826 case 'u': 827 if (addr_cnt > 0) { 828 seterrmsg("unexpected address"); 829 return ERR; 830 } 831 GET_COMMAND_SUFFIX(); 832 if (pop_undo_stack() < 0) 833 return ERR; 834 break; 835 case 'w': 836 case 'W': 837 if ((n = *ibufp) == 'q' || n == 'Q') { 838 gflag = EOF; 839 ibufp++; 840 } 841 if (!isspace(*ibufp)) { 842 seterrmsg("unexpected command suffix"); 843 return ERR; 844 } else if ((fnp = get_filename()) == NULL) 845 return ERR; 846 if (addr_cnt == 0 && !addr_last) 847 first_addr = second_addr = 0; 848 else if (check_addr_range(1, addr_last) < 0) 849 return ERR; 850 GET_COMMAND_SUFFIX(); 851 if (*old_filename == '\0' && *fnp != '!') 852 strlcpy(old_filename, fnp, sizeof old_filename); 853 #ifdef BACKWARDS 854 if (*fnp == '\0' && *old_filename == '\0') { 855 seterrmsg("no current filename"); 856 return ERR; 857 } 858 #endif 859 if ((addr = write_file(*fnp ? fnp : old_filename, 860 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 861 return ERR; 862 else if (addr == addr_last) 863 modified = 0; 864 else if (modified && !scripted && n == 'q') 865 gflag = EMOD; 866 break; 867 case 'x': 868 if (addr_cnt > 0) { 869 seterrmsg("unexpected address"); 870 return ERR; 871 } 872 GET_COMMAND_SUFFIX(); 873 #ifdef DES 874 des = get_keyword(); 875 #else 876 seterrmsg("crypt unavailable"); 877 return ERR; 878 #endif 879 break; 880 case 'z': 881 first_addr = 1; 882 #ifdef BACKWARDS 883 if (check_addr_range(first_addr, current_addr + 1) < 0) 884 #else 885 if (check_addr_range(first_addr, current_addr + !isglobal) < 0) 886 #endif 887 return ERR; 888 else if ('0' < *ibufp && *ibufp <= '9') 889 STRTOI(rows, ibufp); 890 GET_COMMAND_SUFFIX(); 891 if (display_lines(second_addr, min(addr_last, 892 second_addr + rows), gflag) < 0) 893 return ERR; 894 gflag = 0; 895 break; 896 case '=': 897 GET_COMMAND_SUFFIX(); 898 printf("%d\n", addr_cnt ? second_addr : addr_last); 899 break; 900 case '!': 901 if (addr_cnt > 0) { 902 seterrmsg("unexpected address"); 903 return ERR; 904 } else if ((sflags = get_shell_command()) < 0) 905 return ERR; 906 GET_COMMAND_SUFFIX(); 907 if (sflags) printf("%s\n", shcmd + 1); 908 system(shcmd + 1); 909 if (!scripted) printf("!\n"); 910 break; 911 case '\n': 912 first_addr = 1; 913 #ifdef BACKWARDS 914 if (check_addr_range(first_addr, current_addr + 1) < 0 915 #else 916 if (check_addr_range(first_addr, current_addr + !isglobal) < 0 917 #endif 918 || display_lines(second_addr, second_addr, 0) < 0) 919 return ERR; 920 break; 921 default: 922 seterrmsg("unknown command"); 923 return ERR; 924 } 925 return gflag; 926 } 927 928 929 /* check_addr_range: return status of address range check */ 930 int 931 check_addr_range(int n, int m) 932 { 933 if (addr_cnt == 0) { 934 first_addr = n; 935 second_addr = m; 936 } 937 if (first_addr > second_addr || 1 > first_addr || 938 second_addr > addr_last) { 939 seterrmsg("invalid address"); 940 return ERR; 941 } 942 return 0; 943 } 944 945 946 /* get_matching_node_addr: return the address of the next line matching a 947 pattern in a given direction. wrap around begin/end of editor buffer if 948 necessary */ 949 int 950 get_matching_node_addr(pattern_t *pat, int dir) 951 { 952 char *s; 953 int n = current_addr; 954 line_t *lp; 955 956 if (!pat) return ERR; 957 do { 958 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) { 959 lp = get_addressed_line_node(n); 960 if ((s = get_sbuf_line(lp)) == NULL) 961 return ERR; 962 if (isbinary) 963 NUL_TO_NEWLINE(s, lp->len); 964 if (!regexec(pat, s, 0, NULL, 0)) 965 return n; 966 } 967 } while (n != current_addr); 968 seterrmsg("no match"); 969 return ERR; 970 } 971 972 973 /* get_filename: return pointer to copy of filename in the command buffer */ 974 char * 975 get_filename(void) 976 { 977 static char *file = NULL; 978 static int filesz = 0; 979 int n; 980 981 if (*ibufp != '\n') { 982 SKIP_BLANKS(); 983 if (*ibufp == '\n') { 984 seterrmsg("invalid filename"); 985 return NULL; 986 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 987 return NULL; 988 else if (*ibufp == '!') { 989 ibufp++; 990 if ((n = get_shell_command()) < 0) 991 return NULL; 992 if (n) printf("%s\n", shcmd + 1); 993 return shcmd; 994 } else if (n >= MAXPATHLEN) { 995 seterrmsg("filename too long"); 996 return NULL; 997 } 998 } 999 #ifndef BACKWARDS 1000 else if (*old_filename == '\0') { 1001 seterrmsg("no current filename"); 1002 return NULL; 1003 } 1004 #endif 1005 REALLOC(file, filesz, MAXPATHLEN, NULL); 1006 for (n = 0; *ibufp != '\n';) 1007 file[n++] = *ibufp++; 1008 file[n] = '\0'; 1009 return is_legal_filename(file) ? file : NULL; 1010 } 1011 1012 1013 /* get_shell_command: read a shell command from stdin; return substitution 1014 status */ 1015 int 1016 get_shell_command(void) 1017 { 1018 static char *buf = NULL; 1019 static int n = 0; 1020 1021 char *s; /* substitution char pointer */ 1022 int i = 0; 1023 int j = 0; 1024 1025 if (red) { 1026 seterrmsg("shell access restricted"); 1027 return ERR; 1028 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 1029 return ERR; 1030 REALLOC(buf, n, j + 1, ERR); 1031 buf[i++] = '!'; /* prefix command w/ bang */ 1032 while (*ibufp != '\n') 1033 switch (*ibufp) { 1034 default: 1035 REALLOC(buf, n, i + 2, ERR); 1036 buf[i++] = *ibufp; 1037 if (*ibufp++ == '\\') 1038 buf[i++] = *ibufp++; 1039 break; 1040 case '!': 1041 if (s != ibufp) { 1042 REALLOC(buf, n, i + 1, ERR); 1043 buf[i++] = *ibufp++; 1044 } 1045 #ifdef BACKWARDS 1046 else if (shcmd == NULL || *(shcmd + 1) == '\0') 1047 #else 1048 else if (shcmd == NULL) 1049 #endif 1050 { 1051 seterrmsg("no previous command"); 1052 return ERR; 1053 } else { 1054 REALLOC(buf, n, i + shcmdi, ERR); 1055 for (s = shcmd + 1; s < shcmd + shcmdi;) 1056 buf[i++] = *s++; 1057 s = ibufp++; 1058 } 1059 break; 1060 case '%': 1061 if (*old_filename == '\0') { 1062 seterrmsg("no current filename"); 1063 return ERR; 1064 } 1065 j = strlen(s = strip_escapes(old_filename)); 1066 REALLOC(buf, n, i + j, ERR); 1067 while (j--) 1068 buf[i++] = *s++; 1069 s = ibufp++; 1070 break; 1071 } 1072 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1073 memcpy(shcmd, buf, i); 1074 shcmd[shcmdi = i] = '\0'; 1075 return *s == '!' || *s == '%'; 1076 } 1077 1078 1079 /* append_lines: insert text from stdin to after line n; stop when either a 1080 single period is read or EOF; return status */ 1081 int 1082 append_lines(int n) 1083 { 1084 int l; 1085 char *lp = ibuf; 1086 char *eot; 1087 undo_t *up = NULL; 1088 1089 for (current_addr = n;;) { 1090 if (!isglobal) { 1091 if ((l = get_tty_line()) < 0) 1092 return ERR; 1093 else if (l == 0 || ibuf[l - 1] != '\n') { 1094 clearerr(stdin); 1095 return l ? EOF : 0; 1096 } 1097 lp = ibuf; 1098 } else if (*(lp = ibufp) == '\0') 1099 return 0; 1100 else { 1101 while (*ibufp++ != '\n') 1102 ; 1103 l = ibufp - lp; 1104 } 1105 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1106 return 0; 1107 } 1108 eot = lp + l; 1109 SPL1(); 1110 do { 1111 if ((lp = put_sbuf_line(lp)) == NULL) { 1112 SPL0(); 1113 return ERR; 1114 } else if (up) 1115 up->t = get_addressed_line_node(current_addr); 1116 else if ((up = push_undo_stack(UADD, current_addr, 1117 current_addr)) == NULL) { 1118 SPL0(); 1119 return ERR; 1120 } 1121 } while (lp != eot); 1122 modified = 1; 1123 SPL0(); 1124 } 1125 /* NOTREACHED */ 1126 } 1127 1128 1129 /* join_lines: replace a range of lines with the joined text of those lines */ 1130 int 1131 join_lines(int from, int to) 1132 { 1133 static char *buf = NULL; 1134 static int n; 1135 1136 char *s; 1137 int size = 0; 1138 line_t *bp, *ep; 1139 1140 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1141 bp = get_addressed_line_node(from); 1142 for (; bp != ep; bp = bp->q_forw) { 1143 if ((s = get_sbuf_line(bp)) == NULL) 1144 return ERR; 1145 REALLOC(buf, n, size + bp->len, ERR); 1146 memcpy(buf + size, s, bp->len); 1147 size += bp->len; 1148 } 1149 REALLOC(buf, n, size + 2, ERR); 1150 memcpy(buf + size, "\n", 2); 1151 if (delete_lines(from, to) < 0) 1152 return ERR; 1153 current_addr = from - 1; 1154 SPL1(); 1155 if (put_sbuf_line(buf) == NULL || 1156 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1157 SPL0(); 1158 return ERR; 1159 } 1160 modified = 1; 1161 SPL0(); 1162 return 0; 1163 } 1164 1165 1166 /* move_lines: move a range of lines */ 1167 int 1168 move_lines(int addr) 1169 { 1170 line_t *b1, *a1, *b2, *a2; 1171 int n = INC_MOD(second_addr, addr_last); 1172 int p = first_addr - 1; 1173 int done = (addr == first_addr - 1 || addr == second_addr); 1174 1175 SPL1(); 1176 if (done) { 1177 a2 = get_addressed_line_node(n); 1178 b2 = get_addressed_line_node(p); 1179 current_addr = second_addr; 1180 } else if (push_undo_stack(UMOV, p, n) == NULL || 1181 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1182 SPL0(); 1183 return ERR; 1184 } else { 1185 a1 = get_addressed_line_node(n); 1186 if (addr < first_addr) { 1187 b1 = get_addressed_line_node(p); 1188 b2 = get_addressed_line_node(addr); 1189 /* this get_addressed_line_node last! */ 1190 } else { 1191 b2 = get_addressed_line_node(addr); 1192 b1 = get_addressed_line_node(p); 1193 /* this get_addressed_line_node last! */ 1194 } 1195 a2 = b2->q_forw; 1196 REQUE(b2, b1->q_forw); 1197 REQUE(a1->q_back, a2); 1198 REQUE(b1, a1); 1199 current_addr = addr + ((addr < first_addr) ? 1200 second_addr - first_addr + 1 : 0); 1201 } 1202 if (isglobal) 1203 unset_active_nodes(b2->q_forw, a2); 1204 modified = 1; 1205 SPL0(); 1206 return 0; 1207 } 1208 1209 1210 /* copy_lines: copy a range of lines; return status */ 1211 int 1212 copy_lines(int addr) 1213 { 1214 line_t *lp, *np = get_addressed_line_node(first_addr); 1215 undo_t *up = NULL; 1216 int n = second_addr - first_addr + 1; 1217 int m = 0; 1218 1219 current_addr = addr; 1220 if (first_addr <= addr && addr < second_addr) { 1221 n = addr - first_addr + 1; 1222 m = second_addr - addr; 1223 } 1224 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1225 for (; n-- > 0; np = np->q_forw) { 1226 SPL1(); 1227 if ((lp = dup_line_node(np)) == NULL) { 1228 SPL0(); 1229 return ERR; 1230 } 1231 add_line_node(lp); 1232 if (up) 1233 up->t = lp; 1234 else if ((up = push_undo_stack(UADD, current_addr, 1235 current_addr)) == NULL) { 1236 SPL0(); 1237 return ERR; 1238 } 1239 modified = 1; 1240 SPL0(); 1241 } 1242 return 0; 1243 } 1244 1245 1246 /* delete_lines: delete a range of lines */ 1247 int 1248 delete_lines(int from, int to) 1249 { 1250 line_t *n, *p; 1251 1252 SPL1(); 1253 if (push_undo_stack(UDEL, from, to) == NULL) { 1254 SPL0(); 1255 return ERR; 1256 } 1257 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1258 p = get_addressed_line_node(from - 1); 1259 /* this get_addressed_line_node last! */ 1260 if (isglobal) 1261 unset_active_nodes(p->q_forw, n); 1262 REQUE(p, n); 1263 addr_last -= to - from + 1; 1264 current_addr = from - 1; 1265 modified = 1; 1266 SPL0(); 1267 return 0; 1268 } 1269 1270 1271 /* display_lines: print a range of lines to stdout */ 1272 int 1273 display_lines(int from, int to, int gflag) 1274 { 1275 line_t *bp; 1276 line_t *ep; 1277 char *s; 1278 1279 if (!from) { 1280 seterrmsg("invalid address"); 1281 return ERR; 1282 } 1283 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1284 bp = get_addressed_line_node(from); 1285 for (; bp != ep; bp = bp->q_forw) { 1286 if ((s = get_sbuf_line(bp)) == NULL) 1287 return ERR; 1288 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1289 return ERR; 1290 } 1291 return 0; 1292 } 1293 1294 1295 #define MAXMARK 26 /* max number of marks */ 1296 1297 line_t *mark[MAXMARK]; /* line markers */ 1298 int markno; /* line marker count */ 1299 1300 /* mark_line_node: set a line node mark */ 1301 int 1302 mark_line_node(line_t *lp, int n) 1303 { 1304 if (!islower(n)) { 1305 seterrmsg("invalid mark character"); 1306 return ERR; 1307 } else if (mark[n - 'a'] == NULL) 1308 markno++; 1309 mark[n - 'a'] = lp; 1310 return 0; 1311 } 1312 1313 1314 /* get_marked_node_addr: return address of a marked line */ 1315 int 1316 get_marked_node_addr(int n) 1317 { 1318 if (!islower(n)) { 1319 seterrmsg("invalid mark character"); 1320 return ERR; 1321 } 1322 return get_line_node_addr(mark[n - 'a']); 1323 } 1324 1325 1326 /* unmark_line_node: clear line node mark */ 1327 void 1328 unmark_line_node(line_t *lp) 1329 { 1330 int i; 1331 1332 for (i = 0; markno && i < MAXMARK; i++) 1333 if (mark[i] == lp) { 1334 mark[i] = NULL; 1335 markno--; 1336 } 1337 } 1338 1339 1340 /* dup_line_node: return a pointer to a copy of a line node */ 1341 line_t * 1342 dup_line_node(line_t *lp) 1343 { 1344 line_t *np; 1345 1346 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1347 perror(NULL); 1348 seterrmsg("out of memory"); 1349 return NULL; 1350 } 1351 np->seek = lp->seek; 1352 np->len = lp->len; 1353 return np; 1354 } 1355 1356 1357 /* has_trailing_escape: return the parity of escapes preceding a character 1358 in a string */ 1359 int 1360 has_trailing_escape(char *s, char *t) 1361 { 1362 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1363 } 1364 1365 1366 /* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */ 1367 char * 1368 strip_escapes(char *s) 1369 { 1370 static char *file = NULL; 1371 static int filesz = 0; 1372 1373 int i = 0; 1374 1375 REALLOC(file, filesz, MAXPATHLEN, NULL); 1376 /* assert: no trailing escape */ 1377 while ((file[i++] = (*s == '\\') ? *++s : *s) != '\0' && 1378 i < MAXPATHLEN-1) 1379 s++; 1380 file[MAXPATHLEN-1] = '\0'; 1381 return file; 1382 } 1383 1384 1385 void 1386 signal_hup(int signo) 1387 { 1388 int save_errno = errno; 1389 1390 if (mutex) 1391 sigflags |= (1 << (signo - 1)); 1392 else 1393 handle_hup(signo); 1394 errno = save_errno; 1395 } 1396 1397 1398 void 1399 signal_int(int signo) 1400 { 1401 int save_errno = errno; 1402 1403 if (mutex) 1404 sigflags |= (1 << (signo - 1)); 1405 else 1406 handle_int(signo); 1407 errno = save_errno; 1408 } 1409 1410 1411 void 1412 handle_hup(int signo) 1413 { 1414 char path[MAXPATHLEN]; 1415 char *hup = NULL; /* hup filename */ 1416 1417 if (!sigactive) 1418 quit(1); 1419 sigflags &= ~(1 << (signo - 1)); 1420 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && 1421 home != NULL && 1422 strlen(home) + sizeof("/ed.hup") <= MAXPATHLEN) { 1423 strlcpy(path, home, sizeof(path)); 1424 strlcat(path, "/ed.hup", sizeof(path)); 1425 write_file(hup, "w", 1, addr_last); 1426 } 1427 _exit(2); 1428 } 1429 1430 1431 void 1432 handle_int(int signo) 1433 { 1434 if (!sigactive) 1435 _exit(1); 1436 sigflags &= ~(1 << (signo - 1)); 1437 #ifdef _POSIX_SOURCE 1438 siglongjmp(env, -1); 1439 #else 1440 longjmp(env, -1); 1441 #endif 1442 } 1443 1444 1445 void 1446 handle_winch(int signo) 1447 { 1448 int save_errno = errno; 1449 struct winsize ws; /* window size structure */ 1450 1451 sigflags &= ~(1 << (signo - 1)); 1452 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1453 if (ws.ws_row > 2) 1454 rows = ws.ws_row - 2; 1455 if (ws.ws_col > 8) 1456 cols = ws.ws_col - 8; 1457 } 1458 errno = save_errno; 1459 } 1460 1461 1462 /* is_legal_filename: return a legal filename */ 1463 int 1464 is_legal_filename(char *s) 1465 { 1466 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1467 seterrmsg("shell access restricted"); 1468 return 0; 1469 } 1470 return 1; 1471 } 1472