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